JP6743759B2 - Lubrication device abnormality detection device - Google Patents

Description

The present invention relates to an abnormality detection device for a lubrication device, and more particularly to an abnormality detection device for a lubrication device having two lubrication circuits.

In Patent Document 1, in a hybrid vehicle drive device in which a gear chamber accommodating a transmission and a motor chamber accommodating a motor are formed with a partition wall formed therebetween, the oil temperature of lubricating oil is detected, and the detected oil is detected. A technique for appropriately distributing the amount of lubricating oil to the gear chamber and the motor chamber based on the temperature is disclosed. Further, in Patent Document 2, in a lubricating device using an electric oil pump, lubrication is performed by using a temperature sensor arranged in an oil passage and a flow rate detecting unit that detects a flow rate of lubricating oil discharged from the oil pump. A technique for detecting a device abnormality is disclosed.

JP, 2011-152814, A JP, 2016-161030, A JP 2000-257705 A JP2012-106599A

By the way, in a structure having a gear chamber and a motor chamber as in Patent Document 1, a first lubrication circuit that supplies lubricating oil to the gear chamber using a first oil pump and a motor chamber using a second oil pump. In the case of having a second lubricating circuit that supplies lubricating oil, when detecting an abnormality in these two lubricating circuits, it is necessary to provide a temperature sensor for each circuit, which increases the production cost. ..

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a structure having two lubrication circuits to detect abnormalities in these two lubrication circuits without increasing the number of temperature sensors. An object of the present invention is to provide a lubrication device abnormality detection device that can detect the abnormality.

The gist of the first invention is (a) a first lubricating circuit for supplying the lubricating oil discharged from the first oil pump to the gear mechanism, and the lubricating oil discharged from the second oil pump to the electric motor. An abnormality detection device for a lubricating device, comprising: a second lubricating circuit for supplying; (b) a first oil passage forming the first lubricating circuit and a second oil passage forming the second lubricating circuit. Are close to each other and the oil temperature of the lubricating oil flowing in the first oil passage and the oil temperature of the lubricating oil flowing in the second oil passage are proximate to each other, or the first oil passage and the first oil passage A merged portion where the two oil passages merge, (c) one oil temperature sensor provided in the merged portion or the adjacent portion, and (d) an abnormality in the first lubricating circuit and the second lubricating circuit. A control device for making a determination, and (e) the control device, when the first oil pump is driven and the second oil pump is stopped, lubrication measured by the oil temperature sensor. The abnormality of the first lubrication circuit is determined based on the oil temperature, the second oil pump is driven, while the first oil pump is stopped, the lubricating oil temperature measured by the oil temperature sensor. On the basis of the above, it is functionally provided with a judging section for judging an abnormality of the second lubricating circuit.

According to the abnormality detecting device for a lubricating device of the first aspect of the invention, since the lubricating oil is circulated only by the first lubricating circuit when the first oil pump is driven while the second oil pump is stopped, the proximity portion or The oil temperature of the lubricating oil flowing through the first lubrication circuit is detected by the oil temperature sensor provided at the merging portion. Further, when the second oil pump is driven while the first oil pump is stopped, the lubricating oil is circulated only by the second lubrication circuit, so that the oil temperature sensor provided in the proximity portion or the confluence portion is used to 2 The oil temperature of the lubricating oil flowing through the lubricating circuit is detected. Therefore, by detecting the oil temperature of the lubricating oil while only one of the oil pumps is driven, it is possible to determine the abnormality of each of the first lubricating circuit and the second lubricating circuit based on the oil temperature. it can.

It is a figure which shows simply the structure of the lubrication circuit which comprises the lubrication apparatus applied to the vehicle to which this invention is applied. It is a figure which shows the input/output system of the electronic control unit for detecting the abnormality of the lubrication circuit of FIG. 1, and is a functional block diagram explaining the principal part of a control function. 3 is a flowchart for explaining a control operation for determining an abnormality of a first lubrication circuit by the electronic control device of FIG. 2. 3 is a flowchart for explaining a control operation for determining an abnormality of a second lubrication circuit by the electronic control device of FIG. 2. It is a functional block diagram of an electronic control unit for judging abnormality of a lubrication circuit corresponding to other examples of the present invention. 6 is a flowchart for explaining a control operation for detecting an abnormality of the first lubrication circuit by the electronic control device of FIG. 5. 6 is a flowchart for explaining a control operation for determining an abnormality of a second lubrication circuit by the electronic control device of FIG. 5. It is a figure which shows simply the structure of the lubrication circuit corresponding to the other Example of this invention. It is a figure which shows simply the structure of the lubrication circuit corresponding to the other Example of this invention. 7 is a flowchart for explaining a control operation for determining an abnormality of the first lubrication circuit which is still another aspect of the present invention.

Here, preferably, the first oil pump is rotated in association with an output shaft that is rotated during traveling, and the second oil pump is rotated in association with an engine or a pump driving electric motor. To be Therefore, for example, while the motor is running with the engine stopped, the output shaft rotates to drive the first oil pump, while stopping the second oil pump. At this time, the oil temperature detected by the oil temperature sensor becomes the oil temperature of the lubricating oil flowing through the first lubrication circuit, and the abnormality of the first lubrication circuit can be determined based on this oil temperature. Further, for example, when the engine is driven while the vehicle is stopped, the first oil pump is stopped and the second oil pump is driven by the engine. At this time, the oil temperature detected by the oil temperature sensor becomes the oil temperature of the lubricating oil flowing through the second lubrication circuit, and the abnormality of the second lubrication circuit can be determined based on this oil temperature.

Further, preferably, the control device makes a difference between the oil temperature of the lubricating oil detected by the oil temperature sensor and the estimated oil temperature calculated based on at least one of the outside air temperature, the vehicle speed, and the motor temperature of the electric motor. Is above a predetermined value, it is determined to be abnormal. Alternatively, the control device determines that there is an abnormality when the difference between the amount of change in the oil temperature of the lubricating oil detected by the oil temperature sensor at any time and the amount of change in the estimated oil temperature calculated at any time is greater than or equal to a predetermined value. ..

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that in the following embodiments, the drawings are appropriately simplified or modified, and the dimensional ratios and shapes of the respective parts are not necessarily drawn accurately.

FIG. 1 is a diagram schematically showing a structure of a lubrication circuit 14 which constitutes a lubrication device 12 applied to a vehicle to which the present invention is applied. The vehicle of this embodiment includes an engine E/G, a first electric motor MG1, a second electric motor MG2, and a planetary gear 22 for distributing the power of the engine E/G to the first electric motor MG1 and drive wheels (not shown). , A gear mechanism 16, and a drive device (not shown) configured to include the gear mechanism 16. The drive device is a hybrid capable of engine running in which the power of the engine E/G is transmitted to the drive wheels for running, and motor running (EV running) in which the power of the second electric motor MG2 is transmitted to the drive wheels for running, for example. It is a type of drive. The lubrication device 12 is provided to lubricate (cool) various gears such as the gear mechanism 16 provided in the drive device and an electric motor, and includes a lubrication circuit 14 and an electronic control device 60 described later.

The lubricating circuit 14 supplies the lubricating oil discharged from the first oil pump P1 to the gear mechanism 16 and a bearing 18 for rotatably supporting the gear mechanism 16, and a second lubricating circuit 20. The second lubricating circuit 24 is provided for supplying the lubricating oil discharged from the pump P2 to the first electric motor MG1, the second electric motor MG2, and the planetary gear 22 functioning as a power distribution mechanism.

The first lubricating circuit 20 pumps the lubricating oil stored in a lubricating oil storage portion 28 (oil pan) formed vertically below the case 26 that protects the drive device through the first strainer 30. The pump P1, the first discharge oil passage 32 through which the lubricating oil pumped up by the first oil pump P1 is discharged (supplied), and the lubricating oil in the first discharge oil passage 32 which is located vertically above the case 26 It is configured to include a catch tank 34 that is temporarily stored, and a circulating oil passage 38 that circulates the lubricating oil stored in the catch tank 34 to the lubricating oil reservoir 28. In this embodiment, the lubricating oil storage portion 28 is composed of a first lubricating oil storage portion 28a, a second lubricating oil storage portion 28b, and a third lubricating oil storage portion 28c, and is stored in the first lubricating oil storage portion 28a. The lubricating oil is pumped up by the first oil pump P1, and the lubricating oil stored in the second lubricating oil storage portion 28b is pumped up by the second oil pump P2. Further, the lubricating oil stored in the third lubricating oil storage portion 28c is scraped up by the gears that form the differential device 36 (Diff) and supplied to various lubricating main parts.

The first oil pump P1 is rotationally driven in conjunction with a predetermined rotating shaft (for example, an output shaft of the transmission) that rotates while the vehicle is traveling. Therefore, the first oil pump P1 is rotationally driven in conjunction with a predetermined rotating shaft while the vehicle is traveling. The lubricating oil pumped up by the first oil pump P1 is supplied to the first discharge oil passage 32. The first discharge oil passage 32 is connected so as to be able to supply lubricating oil to the essential parts of lubrication of the gear mechanism 16 and the bearing 18, and is also connected to the catch tank 34. Therefore, the lubricating oil discharged from the first oil pump P1 is supplied to the gear mechanism 16 and the bearing 18 through the first discharge oil passage 32. Further, a part of the lubricating oil flowing in the first discharge oil passage 32 is temporarily stored in the catch tank 34. The lubricating oil temporarily stored in the catch tank 34 recirculates to the lubricating oil storage portion 28 (first lubricating oil storage portion 28a) through the circulating oil passage 38 shown by the broken line. The gear mechanism 16 is various gears (excluding the planetary gear 22) that form a power transmission path between the engine and the drive wheels, such as a reduction gear. The bearing 18 is at least one bearing that rotatably supports the gear mechanism 16.

The second lubricating circuit 24 discharges the second oil pump P2 that pumps up the lubricating oil stored in the second lubricating storage portion 28b via the second strainer 40, and the lubricating oil pumped up by the second oil pump P2 ( (Supplied) second discharge oil passage 42, an oil cooler 44 connected to the second discharge oil passage 42, and a cooling oil passage 45 to which the lubricating oil cooled by the oil cooler 44 is supplied. Is configured.

The second oil pump P2 is rotationally driven by the engine E/G. The lubricating oil pumped up by the second oil pump P2 is supplied to the second discharge oil passage 42. The second discharge oil passage 42 is connected to the planetary gear 22 and a lubrication essential part (cooling essential part) of the first electric motor MG1, and is also connected to an oil cooler 44. Therefore, the lubricating oil discharged from the second oil pump P2 is supplied to the planetary gear 22 and the first electric motor MG1 through the second discharge oil passage 42. Further, a part of the lubricating oil supplied to the second discharge oil passage 42 is cooled via the oil cooler 44 and then supplied to the cooling oil passage 45. The cooling oil passage 45 is connected to the cooling essential parts of the first electric motor MG1 and the second electric motor MG2, and the lubricating oil cooled by the oil cooler 44 passes through the cooling oil passage 45 and is passed through the first electric motor MG1. And supplied to the cooling main part of the second electric motor MG2. The lubricating oil that lubricates (cools) the planetary gear 22, the first electric motor MG1, and the second electric motor MG2 flows back to the lubricating oil reservoir 28 along the wall surface of the case 26 and the like.

Further, in the lubrication circuit 14, a proximity portion 46 is provided in which the circulating oil passage 38 that constitutes the first lubrication circuit 20 and the second discharge oil passage 42 that constitutes the second lubrication circuit 24 are in close proximity to each other. An oil temperature sensor 48 is provided in the proximity portion 46. The oil temperature sensor 48 is configured to be able to detect the oil temperature Toil of the lubricating oil flowing through the proximity portion 46. In the first lubricating circuit 20, the oil temperature sensor 48 is provided on the downstream side of the first lubricating circuit 20, specifically, at a position immediately before the lubricating oil reservoir 28. The circulating oil passage 38 corresponds to the first oil passage forming the first lubricating circuit of the present invention, and the second discharge oil passage 42 corresponds to the second oil passage forming the second lubricating circuit of the present invention. doing.

The lubrication device 12 includes an electronic control device 60 for determining an abnormality of the lubrication circuit 14 (the first lubrication circuit 20 and the second lubrication circuit 24). FIG. 2 is a diagram showing an input/output system of the electronic control unit 60, and is a functional block diagram for explaining a main part of a control function. The electronic control unit 60 is configured to include a so-called microcomputer provided with, for example, a CPU, a RAM, a ROM, an input/output interface, and the CPU uses a temporary storage function of the RAM while following a program stored in the ROM in advance. Performs signal processing.

The electronic control unit 60 has a signal representing the lubricating oil temperature Toil of the lubricating oil in the lubricating circuit 14 detected by the oil temperature sensor 48, a signal representing the outside air temperature Tair detected by the outside air temperature sensor 62, and an engine speed sensor. A signal representing the engine rotation speed Ne detected by 63, a signal representing the vehicle speed V detected by the vehicle speed sensor 64, a signal representing the temperature Tmg1 of the first electric motor MG1 detected by the MG1 temperature sensor 66, and a MG2 temperature sensor 68. A signal or the like indicating the detected temperature Tmg2 of the second electric motor MG2 is input.

The electronic control unit 60 functionally includes a control unit for determining abnormality of the lubrication circuit 14 based on various input signals. Specifically, the electronic control unit 60 includes a running state determination unit 80 (running state determination unit), an estimated oil temperature calculation unit 82 (estimated oil temperature calculation unit), an abnormality determination unit 84 (abnormality determination unit), and an abnormality determination. A control unit 86 (abnormality confirmation control means) is functionally provided. The abnormality detection device of the present invention includes an electronic control device 60 and an oil temperature sensor 48.

The traveling state determination unit 80 determines whether the traveling mode during traveling is EV traveling. During traveling, the traveling state determination unit 80 determines whether the vehicle is EV traveling, for example, based on whether the engine rotation speed Ne is zero or an extremely low rotation speed that can be regarded as an engine stopped state. Alternatively, it can be determined based on whether the engine fuel supply stop signal is output during traveling.

Further, the traveling state determination unit 80 determines whether the engine 12 is in a driven state (hereinafter, a stopped engine driving state or a stopped engine driving state) at an extremely low vehicle speed at which the vehicle speed V can be regarded as zero or a vehicle stopped state. The traveling state determination unit 80 determines when the stopped engine is driven, for example, based on whether the vehicle speed V is less than a lower limit threshold that can be regarded as a vehicle stopped state and the engine rotation speed Ne is equal to or higher than the idle rotation speed Neidle. ..

The estimated oil temperature calculation unit 80 calculates the estimated oil temperature Test of the lubricating oil flowing through the adjacent portion 46 during the EV traveling when the traveling state determination unit 80 determines that the EV traveling is in progress. The estimated oil temperature calculation unit 80 calculates the estimated oil temperature Test based on, for example, a first relationship map applied during EV traveling, which is obtained and stored experimentally or by design in advance. The first relationship map is configured using, for example, the outside air temperature Tair, the vehicle speed V, the temperature Tmg1 of the first electric motor MG1 (hereinafter, first temperature Tmg1), and the temperature Tmg2 of the second electric motor MG2 (hereinafter, second temperature Tmg2) as parameters. 6 is a map for calculating an estimated oil temperature Test (estimated value) of the lubricating oil flowing through the proximity portion 46.

Each parameter forming the first relationship map affects the lubricating oil temperature Toil. For example, the higher the outside air temperature Tair, the higher the lubricating oil temperature Toil as a whole. Therefore, in the first relationship map, the estimated oil temperature Test is set to increase as the outside air temperature Tair increases. Further, as the vehicle speed V increases, the heat generated by the stirring of the differential device 36 increases, and the heat generation amount in the meshing portion and the bearing of the gear to which the lubricating oil is supplied also increases. Therefore, in the first relation map, the estimated oil temperature Test is set to increase as the vehicle speed V increases. Furthermore, the higher the first temperature Tmg1 and the second temperature Tmg2, the greater the amount of heat that the lubricating oil receives when cooling the first electric motor MG1 and the second electric motor MG2. Therefore, the estimated oil temperature Test is set to increase as the first temperature Tmg1 and the second temperature Tmg2 increase. The estimated oil temperature calculation unit 80 calculates the estimated oil temperature Test at any time by applying each parameter detected at any time to the first relationship map.

Here, since the engine E/G is not driven during EV traveling, the second oil pump P2 is not driven. That is, during EV traveling, only the first oil pump P1 is driven, and the lubricating oil is circulated only by the first lubricating circuit 20 of the lubricating circuit 14. Therefore, the first relation map applied during EV traveling is the estimated oil temperature Test of the lubricating oil flowing through the proximity portion 46 when only the first lubricating circuit 20 is operating. When only the first lubrication circuit 20 is operating, the lubrication oil is not supplied to the first electric motor MG1 and the second electric motor MG2 via the first lubrication circuit 20, but the lubrication oil scraped up by the differential device 36 is , The first electric motor MG1 and the second electric motor MG2. Therefore, even during EV traveling, while the first electric motor MG1 and the second electric motor MG2 are cooled, the lubricating oil temperature Toil rises due to the heat received from the first electric motor MG1 and the second electric motor MG2. In this regard, since the first temperature Tmg1 and the second temperature Tmg2 influence the lubricating oil temperature Toil even during EV traveling, in the first relation map, the first temperature Tmg1 and the second temperature Tmg2 are It is applied as a parameter for determining the estimated oil temperature Test.

The estimated oil temperature calculation unit 80 calculates the estimated oil temperature Test of the lubricating oil flowing through the proximity unit 46 when the stopped engine is driven when the running state determination unit 80 determines that the stopped engine is driven. The estimated oil temperature calculation unit 80 calculates the estimated oil temperature Test based on, for example, a second relational map that is previously obtained experimentally or by design and stored and that is applied when the stopped engine is driven. Similarly to the first relationship map, the second relationship map is also configured with the outside temperature Tair, the vehicle speed V, the first temperature Tmg1 of the first electric motor MG1, and the second temperature Tmg2 of the second electric motor MG2 as parameters. 6 is a map for calculating an estimated oil temperature Test (estimated value) of lubricating oil flowing in the proximity section 46. Note that the changing tendency of the estimated oil temperature Test in the second relation map is the same as the estimated oil temperature Test in the first relation map, and thus the description thereof is omitted.

Here, when the stop engine is driven, the rotation shaft for driving the first oil pump P1 stops rotating, so that the first oil pump P1 does not drive. That is, when the engine is stopped, only the second oil pump P2 is driven, and the lubricating oil circulates only in the second lubricating circuit 24 of the lubricating circuit 14. Therefore, the second relation map applied when the stopped engine is driven is the estimated oil temperature Test of the lubricating oil flowing through the proximity portion 46 when only the second lubricating circuit 24 is operating. When only the second lubrication circuit 24 is operating, the lubrication oil is not supplied to the gear mechanism 16 and the bearing 18 via the second lubrication circuit 24, but the lubrication oil scraped up by the differential device 36 is 16 and bearings 18. Therefore, the gear mechanism 16 and the bearing 18 are lubricated even when the engine is stopped.

As described above, only the first lubrication circuit 20 operates during EV traveling, and only the second lubrication circuit 24 operates during stop engine driving. Therefore, a relationship map (first relationship map, second relationship map) different for each traveling state is provided. Map) is applied.

The abnormality determination unit 84 determines the abnormality of each of the first lubrication circuit 20 and the second lubrication circuit 24 that configure the lubrication circuit 14, based on the lubrication oil temperature Toil. The abnormality determination unit 84 has a difference S1 (=|Toil−Test|) between the lubricating oil temperature Toil detected (obtained) by the oil temperature sensor 48 at any time and the estimated oil temperature Test calculated by the estimated oil temperature calculation unit 80 at any time. ) Is calculated, and it is determined whether the calculated difference S1 is larger than a preset allowable threshold value α. The permissible threshold value α is a value that has been experimentally or designed in advance, and is set to a threshold value within the permissible range in which it can be determined that the lubricating circuit 14 is operating normally. Further, the allowable threshold value α may be appropriately changed according to the traveling state of the vehicle.

When the lubrication circuit 14 is operating normally, the lubricating oil temperature Toil is equal to the estimated oil temperature Test or a value near the estimated oil temperature Test. That is, the difference S1 is within the allowable threshold α. On the other hand, when the lubricating circuit 14 is not operating normally, the lubricating oil does not circulate in the circuit, so the lubricating oil temperature Toil does not rise and reaches the temperature of the outside air temperature Tair. Therefore, the difference S1 becomes larger than the allowable threshold α. From this, the abnormality determination unit 84 determines that the lubricating circuit 14 is operating normally when the difference S1 is within the allowable threshold α, and when the difference S1 is larger than the allowable threshold α. , It is determined that an abnormality has occurred in the lubrication circuit 14.

Further, during EV traveling, the first oil pump P1 is driven, while the second oil pump P2 is stopped and only the first lubrication circuit 20 is operating, so the abnormality determination unit 84 determines an abnormality during EV traveling. In that case, an abnormality may have occurred in the first lubrication circuit 20. Therefore, when the abnormality determination unit 84 determines an abnormality during EV traveling, the abnormality determination unit 84 tentatively determines that an abnormality has occurred in the first lubrication circuit 20.

When the stopped engine is driven, the second oil pump P2 is driven, while the first oil pump P1 is stopped and only the second lubrication circuit 24 is operating. If the determination is made, there is a possibility that an abnormality has occurred in the second lubrication circuit 24. Therefore, when the abnormality determination unit 84 determines the abnormality when the stopped engine is driven, the abnormality determination unit 84 tentatively determines that the abnormality has occurred in the second lubrication circuit 24.

Here, even when the abnormality determination unit 84 determines the abnormality of the first lubrication circuit 20 or the second lubrication circuit 24, the abnormality of the lubrication circuit 14 can be determined due to the abnormality of the oil temperature sensor 48. There is also a nature. If the abnormality determination of the first lubrication circuit 20 or the second lubrication circuit 24 is tentatively determined, the abnormality confirmation control unit 86 causes the other oil pump in the stopped state to be driven, and causes the abnormality determination to be executed again. Then, the abnormality of the lubrication circuit for which the abnormality is determined is determined. Specifically, it is determined whether the provisionally determined abnormality is the abnormality of the first lubrication circuit 20 or the second lubrication circuit 24 or the abnormality of the oil temperature sensor 48.

The abnormality confirmation control unit 86 executes control for confirming the abnormality of the first lubrication circuit 20, for example, when the abnormality of the first lubrication circuit 20 is determined during EV traveling. Specifically, the abnormality determination control unit 86 drives the engine E/G to rotate the second oil pump P2, and the second oil pump P2 is driven (that is, the second lubrication circuit 24 is operated). Then, the estimated oil temperature calculation unit 82 and the abnormality determination unit 84 are executed again.

The estimated oil temperature calculation unit 82 calculates the estimated oil temperature Test after a predetermined time T1 has elapsed from the start of driving the second oil pump P2. At this time, since the second oil pump P2 is driven in a state where it is determined that the abnormality has occurred in the first lubrication circuit 20, the second relationship applied when only the second lubrication circuit 24 is operating. The estimated oil temperature Test is calculated based on the map. The predetermined time T1 is obtained experimentally or by design in advance, and is set to, for example, a time during which the driving of the second oil pump P2 is stable.

The abnormality determination unit 84 determines whether the difference S1 between the calculated estimated oil temperature Test and the lubricating oil temperature Toil detected by the oil temperature sensor 48 is larger than the allowable threshold α, and the difference S1 is larger than the allowable threshold α. When it is larger, it is determined that the first lubrication circuit 20 is normal and the oil temperature sensor 48 has an abnormality. On the other hand, the abnormality determination unit 84 determines the abnormality of the first lubrication circuit 20 when the difference S1 is less than or equal to the allowable threshold α.

When the second oil pump P2 is driven in a state where an abnormality has occurred in the first lubrication circuit 20 (that is, the non-operation state of the first lubrication circuit 20), only the second lubrication circuit 24 operates, so that the lubricating oil flowing in the proximity portion 46 is operated. The lubricating oil temperature Toil of is estimated from the second relation map. Therefore, when there is an abnormality in the first lubricating circuit 20, the lubricating oil temperature Toil of the lubricating oil flowing in the proximity portion 46 becomes the estimated oil temperature Test. Therefore, when the difference S1 is less than or equal to the allowable threshold value α, the first The abnormality of the lubricating circuit 20 can be confirmed. On the other hand, even when the second oil pump P2 is driven, if the difference S1 is larger than the allowable threshold value α, the oil temperature sensor 48 may have an abnormality. Therefore, when the difference S1 is larger than the allowable threshold value α, an abnormality occurs in the oil temperature sensor 48, and the first lubricating circuit 20 can be determined to be normal.

Further, when the abnormality determining unit 84 tentatively determines the abnormality of the second lubricating circuit 24 when the engine is stopped, the abnormality determining control unit 86 executes the control for determining the abnormality of the second lubricating circuit 24. .. Specifically, the abnormality determination control unit 86 determines whether the vehicle speed V has risen to a predetermined value V1, and when it determines that the vehicle speed V has reached the predetermined value V1, the estimated oil temperature calculation unit 82 and the abnormality determination unit 84 is executed again. It should be noted that the predetermined value of the vehicle speed V is obtained experimentally or by design in advance and, for example, a value with which it can be determined that the first oil pump P1 has been driven (that is, the first lubrication circuit 20 has been activated) as the vehicle speed V increases. Is set to.

The estimated oil temperature calculation unit 82 calculates the estimated oil temperature Test when the vehicle speed V reaches a predetermined value V1. At this time, the first oil pump P1 is driven in a state where it is determined that the abnormality has occurred in the second lubrication circuit 24 (the second lubrication circuit 24 does not operate), that is, the first lubrication circuit 20 operates. From the above, the estimated oil temperature Test is calculated based on the first relation map applied when only the first lubrication circuit 20 is operating. Further, the abnormality determination unit 84 determines whether the difference S1 between the calculated estimated oil temperature Test and the lubricating oil temperature Toil detected by the oil temperature sensor 48 is larger than the allowable threshold α, and the difference S1 is the allowable threshold α. When it is larger than the above, it is determined that the second lubrication circuit 24 is normal and the oil temperature sensor 48 has an abnormality. On the other hand, the abnormality determination unit 84 determines the abnormality of the second lubrication circuit 24 when the difference S1 is less than or equal to the allowable threshold α.

When the first oil pump P1 is driven in a state where an abnormality has occurred in the second lubrication circuit 24 (that is, the second lubrication circuit 24 is not operating), only the first lubrication circuit 20 operates, so the lubricating oil temperature of the proximity portion 46 is increased. Toil is estimated based on the first relationship map. Therefore, if there is an abnormality in the second lubricating circuit 24, the lubricating oil temperature Toil of the proximity portion 46 becomes the estimated oil temperature Test. Can be confirmed. On the other hand, even when the first oil pump P1 is driven, if the difference S1 is larger than the allowable threshold value α, the oil temperature sensor 48 may have an abnormality. Therefore, when the difference S1 is larger than the allowable threshold α, an abnormality occurs in the oil temperature sensor 48, and the second lubrication circuit 24 can be determined to be normal.

FIG. 3 is a flowchart for explaining the control operation by the electronic control unit 60 for determining an abnormality in the first lubrication circuit 20. This flowchart is repeatedly executed during vehicle operation.

First, in step ST1 (hereinafter, step is omitted) corresponding to the control function of the traveling state determination unit 80, it is determined whether EV traveling is in progress. When ST1 is denied, this routine is ended. When ST1 is affirmed, in ST2 corresponding to the control function of the abnormality determination unit 84, the lubricating oil temperature Toil of the lubricating oil flowing through the proximity unit 46 detected by the oil temperature sensor 48 is acquired. At this time, if the lubricating circuit 14 is normal, the lubricating oil temperature Toil when only the first lubricating circuit 20 is operated is acquired. Next, in ST3 corresponding to the control function of the estimated oil temperature calculation unit 82, the estimated oil temperature Test, which is the estimated value of the lubricating oil temperature Toil of the lubricating oil flowing through the proximity unit 46, is calculated based on the first relationship map. .. In ST4 corresponding to the control function of the abnormality determination unit 84, the difference S1 (oil temperature difference) between the lubricating oil temperature Toil acquired by the oil temperature sensor 48 in ST2 and the estimated oil temperature Test1 calculated in ST3 is less than the allowable threshold α. Is also determined to be larger.

When it is determined in ST4 that the difference S1 is less than or equal to the allowable threshold value α, ST4 is denied, the process proceeds to ST11 corresponding to the control function of the abnormality determination unit 84, and the first lubrication circuit 20 is determined to be normal. On the other hand, in ST4, when the difference S1 is larger than the allowable threshold value α, ST4 is affirmative, and in ST5 corresponding to the control function of the abnormality determination unit 84, the abnormality of the first lubrication circuit 20 is provisionally determined.

In ST6 corresponding to the control function of the abnormality determination control unit 86, the second oil pump P2 is rotated by driving the engine E/G. Next, in ST7 corresponding to the control function of the abnormality determination unit 84, the oil temperature sensor 48 acquires the lubricating oil temperature Toil of the lubricating oil flowing through the adjacent portion 46 after a predetermined time T1 has elapsed from the start of rotation of the second oil pump P2. It In ST8 corresponding to the control function of the estimated oil temperature calculation unit 82, the estimated oil temperature Test of the lubricating oil flowing through the adjacent portion 46 after the elapse of a predetermined time T1 from the start of rotation of the second oil pump P2 is based on the second relation map. Is calculated.

In ST9 corresponding to the control function of the abnormality determination unit 84, it is determined whether the difference S1 between the lubricating oil temperature Toil acquired in ST7 and the estimated oil temperature Test calculated in ST8 is larger than the allowable threshold α. In ST9, when the difference S1 is larger than the allowable threshold value α, ST9 is affirmative, the process proceeds to ST11, it is determined that an abnormality has occurred in the oil temperature sensor 48, and the first lubrication circuit 20 is determined to be normal. On the other hand, if the difference S1 is less than or equal to the allowable threshold value α in ST9, ST9 is denied and the process proceeds to ST10 corresponding to the control function of the abnormality determination unit 84 to determine the abnormality of the first lubrication circuit 20.

FIG. 4 is a flow chart for explaining the control operation by the electronic control unit 60 for determining the abnormality of the second lubrication circuit 24. This flowchart is repeatedly executed during vehicle operation.

First, in step ST21 (hereinafter, step is omitted) corresponding to the control function of the traveling state determination unit 80, it is determined whether or not the engine is stopped (the vehicle is in a stopped state and the engine is driven). .. When ST21 is denied, this routine is ended. When ST21 is affirmative, in ST2 corresponding to the control function of the abnormality determination unit 84, the oil temperature Toil of the lubricating oil flowing through the proximity unit 46 detected by the oil temperature sensor 48 is acquired. At this time, if the lubricating circuit 14 is normal, the lubricating oil temperature Toil when only the second lubricating circuit 24 operates is acquired. Next, in ST23 corresponding to the control function of the estimated oil temperature calculation unit 82, the estimated oil temperature Test, which is the estimated value of the lubricating oil temperature Toil of the lubricating oil flowing through the adjacent portion 46, is calculated based on the second relation map. .. In ST24 corresponding to the control function of the abnormality determination unit 84, it is determined whether the difference S1 (oil temperature difference) between the lubricating oil temperature Toil acquired in ST22 and the estimated oil temperature Test calculated in ST23 is larger than the allowable threshold α. It

If the difference S1 is determined to be less than or equal to the allowable threshold value α in ST24, ST24 is denied and the abnormality determination unit 84 proceeds to ST21 corresponding to the control function to determine that the second lubrication circuit 24 is normal. On the other hand, in ST24, when the difference S1 is larger than the allowable threshold value α, ST24 is affirmative, and in ST25 corresponding to the control function of the abnormality determination unit 84, the abnormality of the second lubricating circuit 24 is provisionally determined.

In ST26 corresponding to the control function of the abnormality determination control unit 86, it is determined whether the rotation of the first oil pump P1 is started based on whether the vehicle speed V reaches the predetermined value V1. The same determination is repeatedly executed while ST26 is denied. When ST26 is affirmed, in ST27 corresponding to the control function of the abnormality determination unit 84, the lubricating oil temperature Toil of the lubricating oil flowing through the proximity unit 46 detected by the hydraulic sensor 48 is acquired. In ST28 corresponding to the control function of the estimated oil temperature calculation unit 82, the estimated oil temperature Test of the lubricating oil flowing through the proximity unit 46 in the state where the first oil pump P1 is rotated (that is, the state where the first lubrication circuit 20 is operated). Is calculated based on the first relationship map.

In ST29 corresponding to the control function of the abnormality determination unit 84, it is determined whether the difference S1 (oil temperature difference) between the lubricating oil temperature Toil acquired in ST27 and the estimated oil temperature Test calculated in ST28 is larger than the allowable threshold α. To be done. In ST29, when the difference S1 is larger than the allowable threshold value α, ST29 is affirmative, the process proceeds to ST31, it is determined that an abnormality has occurred in the oil temperature sensor 48, and the second lubrication circuit 24 is determined to be normal. On the other hand, when the difference S1 is less than or equal to the predetermined threshold value α in ST29, ST29 is denied and the process proceeds to ST30 corresponding to the control function of the abnormality determination unit 84, and the abnormality of the second lubricating circuit 24 is confirmed.

As described above, according to this embodiment, during EV traveling, the first oil pump P1 is driven, while the second oil pump P2 is stopped, so that the lubricating oil is circulated only by the first lubricating circuit 20. The lubricating oil temperature Toil detected by the oil temperature sensor 48 provided in the proximity portion 46 is the lubricating oil temperature Toil of the lubricating oil flowing through the first lubricating circuit 20. Further, when the engine is stopped, the second oil pump P2 is driven while the first oil pump P1 is stopped, and the lubricating oil is circulated only by the second lubricating circuit 24. The lubricating oil temperature Toil detected by the oil temperature sensor 48 is the lubricating oil temperature Toil of the lubricating oil flowing through the second lubricating circuit 24. From this, by detecting the lubricating oil temperature Toil of the lubricating oil by the oil temperature sensor 48 in the traveling state in which only one oil pump is driven, the first lubricating circuit 20 and the first lubricating circuit 20 and the first lubricating circuit 20 based on the lubricating oil temperature Toil are detected. Each abnormality of the 2 lubrication circuit 24 can be detected.

Next, another embodiment of the present invention will be described. In the following description, the same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 5 is a functional block diagram of the electronic control unit 100 for determining abnormality of the lubrication circuit 14 (first lubrication circuit 20 and second lubrication circuit 24) according to another embodiment of the present invention. In the present embodiment, the abnormality of the lubricating circuit 14 is determined based on the change amount ΔToil of the lubricating oil temperature Toil and the change amount ΔTest of the estimated oil temperature Test. The structure of the lubrication circuit 14 and the traveling state determination unit 80, which is a part of the control function of the electronic control unit 100, are the same as those in the above-described embodiment, and therefore the same reference numerals are given and the description thereof is omitted. .. Further, the abnormality detecting device of the present invention includes the electronic control device 100 and the oil temperature sensor 48.

The oil temperature change amount calculation unit 101 calculates the change amount ΔToil of the lubricating oil temperature Toil per unit time based on the lubricating oil temperature Toil acquired by the oil temperature sensor 48 at any time.

The estimated oil temperature change amount calculation unit 102 calculates the change amount ΔTest of the estimated oil temperature Test. The estimated oil temperature change amount calculation unit 102 calculates the estimated oil temperature Test at any time from, for example, the first relation map (when EV is running) or the second relation map (when the engine is stopped), and uses it as the estimated oil temperature Test that is calculated at any time. Based on this, the change amount ΔTest is calculated.

The abnormality determination unit 104 determines an abnormality in each of the first lubrication circuit 20 and the second lubrication circuit 24 based on the change amount ΔToil of the lubricating oil temperature Toil. Specifically, the abnormality determination unit 104 determines the change amount ΔToil of the lubricating oil temperature Toil calculated by the oil temperature change amount calculation unit 101 and the change amount of the estimated oil temperature Test calculated by the estimated oil temperature change amount calculation unit 102. The difference S2 from ΔTest (=|ΔToil−ΔTest|) is calculated, and it is determined whether the calculated difference S2 is larger than a preset allowable threshold β. The permissible threshold value β is a value that is experimentally or experimentally obtained in advance, and is set to a threshold value in a range where it can be determined that the lubricating circuit 14 is normally operating.

When the lubrication circuit 14 is operating normally, the change amount ΔToil of the lubricating oil temperature Toil is equal to or near the change amount ΔTest of the estimated oil temperature Test. That is, the difference S2 is within the allowable threshold β. On the other hand, when the lubrication circuit 14 is not operating normally, the lubricating oil is not supplied to the essential parts of the lubrication, so the variation amount ΔToil of the lubricating oil temperature Toil does not reach the variation amount ΔTest of the estimated oil temperature Test. That is, the difference S2 becomes larger than the allowable threshold β. From this, the abnormality determination unit 104 determines that the lubricating circuit 14 is operating normally when the difference S2 is within the allowable threshold β, and when the difference S2 is larger than the allowable threshold β. Determines that an abnormality has occurred in the lubrication circuit 14.

Further, during EV traveling, the first oil pump P1 is driven, while the second oil pump P2 is stopped and only the first lubrication circuit 20 is operating, so the abnormality determination unit 104 determines abnormality during EV traveling. In that case, an abnormality may have occurred in the first lubrication circuit 20. Therefore, when the abnormality determination unit 104 determines an abnormality during EV traveling, the abnormality determination unit 104 tentatively determines that an abnormality has occurred in the first lubrication circuit 20.

Further, when the stopped engine is driven, the second oil pump P2 is driven, while the first oil pump P1 is stopped and only the second lubrication circuit 24 is operating. Therefore, the abnormality determination unit 104 is abnormal when the stopped engine is driven. If it is determined that there is a possibility that an abnormality has occurred in the second lubricating circuit 24. Therefore, when the abnormality determination unit 104 determines the abnormality when the stopped engine is driven, the abnormality determination unit 104 tentatively determines that the abnormality has occurred in the second lubrication circuit 24.

The abnormality confirmation control unit 106 executes the control for confirming the abnormality of the first lubrication circuit 20 when the abnormality of the first lubrication circuit 20 is determined during EV traveling. Specifically, the abnormality determination control unit 106 drives the engine to drive the second oil pump P2, and in the state where the second oil pump P2 is driven, the oil temperature change amount calculation unit 101 and the estimated oil temperature change amount. The abnormality determination by the calculation unit 102 and the abnormality determination unit 104 is executed again.

When the second oil pump P2 is driven in a state where the abnormality has occurred in the first lubrication circuit 20 (the non-operation state of the first lubrication circuit 20), the second lubrication circuit 24 operates. Therefore, the estimated oil temperature change amount calculation unit 102 calculates the change amount ΔTest of the estimated oil temperature Test based on the second relation map applied when the stopped engine is driven.

The abnormality determination unit 104 calculates the difference between the change amount ΔToil of the lubricating oil temperature Toil calculated by the oil temperature change amount calculation unit 101 and the change amount ΔTest of the estimated oil temperature Test calculated by the estimated oil temperature change amount calculation unit 102. It is determined whether S2 is larger than the allowable threshold β. When the second lubrication circuit 24 operates in the state where the abnormality occurs in the first lubrication circuit 20 (the non-operation state of the first lubrication circuit 20), the lubricating oil temperature Toil rises as the second lubrication circuit 24 operates. , The difference S2 becomes the range of the allowable threshold β. From this, the abnormality determination unit 104 determines the abnormality of the first lubrication circuit 20 when the difference S2 falls within the range of the allowable threshold β.

On the other hand, even when the second oil pump P2 is driven, if the difference S2 is larger than the allowable threshold β, the first lubrication circuit 20 is normal, but the oil temperature sensor 48 is abnormal. There is a possibility that Therefore, when the difference S2 is larger than the allowable threshold β, the abnormality determination unit 104 determines that the first lubrication circuit 20 is normal and the abnormality of the oil temperature sensor 48 may occur. ..

When the abnormality determination unit 104 tentatively determines the abnormality of the second lubrication circuit 24 when the engine is stopped, the abnormality determination control unit 106 determines whether the vehicle speed V of the vehicle has reached the predetermined value V1. Then, when it is determined that the vehicle speed V has reached the predetermined value V1, the abnormality determination by the oil temperature change amount calculation unit 101, the estimated oil temperature change amount calculation unit 102, and the abnormality determination unit 104 is executed again.

When the vehicle speed V becomes equal to or higher than the predetermined value V1 in the state where the abnormality occurs in the second lubrication circuit 24, the first oil pump P1 is driven and the lubrication by the first lubrication circuit 20 is executed. Therefore, the estimated oil temperature change amount calculation unit 102 calculates the change amount ΔTest of the estimated oil temperature Test based on the first relationship map, which is applied during EV traveling, that is, when only the first lubrication circuit 20 is operating. ..

The abnormality determination unit 104 calculates the difference between the change amount ΔToil of the lubricating oil temperature Toil calculated by the oil temperature change amount calculation unit 101 and the change amount ΔTest of the estimated oil temperature Test calculated by the estimated oil temperature change amount calculation unit 102. It is determined whether S2 is larger than the allowable threshold β. When the first lubrication circuit 20 operates with the driving of the first oil pump P1 in the state where the abnormality occurs in the second lubrication circuit 24, the lubricating oil temperature Toil rises with the operation of the first lubrication circuit 20, and the lubrication The change amount ΔToil of the oil temperature Toil becomes substantially equal to the change amount ΔTest of the estimated oil temperature Test. That is, the difference S2 becomes the range of the allowable threshold β. Therefore, the abnormality determination unit 104 determines the abnormality of the second lubrication circuit 24 when the difference S2 is less than or equal to the allowable threshold β.

On the other hand, even when the first lubrication circuit 20 operates, if the difference S2 is larger than the allowable threshold β, the second lubrication circuit 24 is normal but the oil temperature sensor 48 is abnormal. There is a possibility that Therefore, when the difference S2 is larger than the allowable threshold β, the abnormality determination unit 104 determines that the second lubrication circuit 24 is normal and the oil temperature sensor 48 may have an abnormality. ..

FIG. 6 is a flowchart for explaining the control operation for detecting an abnormality in the first lubrication circuit 20 by the electronic control unit 100. This flowchart is repeatedly executed during vehicle operation.

First, in step ST41 (hereinafter, step is omitted) corresponding to the control function of the traveling state determination unit 80, it is determined whether EV traveling is in progress. When ST41 is denied, this routine is ended. When ST1 is affirmed, in ST42 corresponding to the control function of the oil temperature change amount calculation unit 101, the change is based on the lubricating oil temperature Toil of the lubricating oil flowing through the proximity unit 46 that is detected by the oil temperature sensor 48 at any time. The quantity ΔToil is calculated. At this time, if the lubrication circuit 14 is normal, the change amount ΔToil of the lubrication oil temperature Toil when only the first lubrication circuit 20 is operating is calculated. Next, in ST43 corresponding to the control function of the estimated oil temperature change amount calculation unit 102, the change amount ΔTest of the estimated oil temperature Test of the lubricating oil flowing through the adjacent portion 46 during EV traveling is calculated.

In ST43 corresponding to the control function of the abnormality determination unit 104, the difference S2 between the change amount ΔToil of the lubricating oil temperature Toil calculated in ST42 and the change amount ΔTest of the estimated oil temperature Test calculated in ST43 is the allowable threshold β. Is determined to be greater than. When it is determined in ST44 that the difference S2 is less than or equal to the allowable threshold β, ST44 is negative, the process proceeds to ST51 corresponding to the control function of the abnormality determination unit 104, and it is determined that the first lubrication circuit 20 is normal. On the other hand, if it is determined in ST44 that the difference S2 is larger than the allowable threshold β, ST44 is affirmative, and provisionally that an abnormality has occurred in the first lubrication circuit 20 in ST45 corresponding to the control function of the abnormality determination unit 104. Is determined.

In ST46 corresponding to the control function of the abnormality determination control unit 106, the second lubrication circuit 24 is operated by rotating the second oil pump P2. Next, in ST47 corresponding to the control operation of the oil temperature change amount calculation unit 101, the change amount ΔToil of the lubricating oil temperature Toil flowing in the adjacent portion 46 after a predetermined time has elapsed from the start of rotation of the second oil pump P2 is calculated. In ST48 corresponding to the control function of the estimated oil temperature change amount calculation unit 102, the change amount ΔTest of the estimated oil temperature Test of the lubricating oil in the proximity unit 46 is calculated.

In ST49 corresponding to the control function of the abnormality determination unit 104, the difference S2 between the change amount ΔToil of the lubricating oil temperature Toil calculated in ST47 and the change amount ΔTest of the estimated oil temperature Test calculated in ST48 is less than the allowable threshold β. Is also determined to be larger. When the difference S2 is larger than the allowable threshold β in ST49, ST49 is affirmative, and it is determined in ST51 that the oil temperature sensor 48 has an abnormality, and the first lubrication circuit 20 is determined to be normal. On the other hand, in ST49, when the difference S2 is equal to or less than the allowable threshold β, ST49 is denied and the process proceeds to ST50 corresponding to the control function of the abnormality determination unit 104, and the abnormality of the first lubrication circuit 20 is confirmed.

FIG. 7 is a flow chart for explaining the control operation by the electronic control unit 100 for determining the abnormality of the second lubrication circuit 24. This flowchart is repeatedly executed during vehicle operation.

First, in step ST61 (hereinafter, step is omitted) corresponding to the control function of the traveling state determination unit 80, it is determined whether or not the engine is stopped. When ST61 is denied, this routine is ended. When ST61 is affirmed, in ST62 corresponding to the control function of the oil temperature change amount calculation unit 101, the lubricating oil of the lubricating oil flowing through the adjacent portion 46 is based on the lubricating oil temperature Toil detected by the oil temperature sensor 48 at any time. The change amount ΔToil of the temperature Toil is calculated. At this time, if the lubrication circuit 14 is normal, the change amount ΔToil of the lubrication oil temperature Toil when only the second lubrication circuit 24 is operating is calculated. Next, in ST63 corresponding to the control function of the estimated oil temperature change amount calculation unit 102, the change amount ΔTest of the estimated oil temperature Test of the lubricating oil flowing through the proximity unit 46 is calculated.

In ST64 corresponding to the control function of the abnormality determination unit 104, the difference S2 between the change amount ΔToil of the lubricating oil temperature Toil calculated in ST62 and the change amount ΔTest of the estimated oil temperature Test calculated in ST63 is the allowable threshold β. Is determined to be greater than. When it is determined in ST64 that the difference S2 is less than or equal to the allowable threshold β, ST64 is negative, the process proceeds to ST71 corresponding to the control function of the abnormality determination unit 104, and it is determined that the second lubrication circuit 24 is normal. On the other hand, in ST64, when it is determined that the difference S2 is larger than the allowable threshold β, ST64 is affirmative, and in ST65 corresponding to the control function of the abnormality determination unit 104, an abnormality occurs in the second lubricating circuit 24 provisionally. Is determined.

In ST66 corresponding to the control function of the abnormality determination control unit 106, it is determined whether the first oil pump P1 has started to rotate based on whether the vehicle speed V has reached the predetermined value V1. While ST66 is denied, the operation of ST66 is repeatedly executed. When ST66 is affirmed, in ST67 corresponding to the control function of the oil temperature change amount calculation unit 101, the change amount ΔToil of the lubricating oil temperature Toil of the lubricating oil flowing through the adjacent portion 46 is calculated. Further, in ST68 corresponding to the control function of the estimated oil temperature change amount calculation unit 102, the change amount ΔTest of the estimated oil temperature Test of the lubricating oil flowing through the proximity unit 46 is calculated.

In ST69 corresponding to the control function of the abnormality determination unit 104, the difference S2 between the change amount ΔToil of the lubricating oil temperature Toil calculated in ST67 and the change amount ΔTest of the estimated oil temperature Test calculated in ST68 is the allowable threshold β. Is determined to be greater than. When the difference S2 is larger than the allowable threshold β in ST69, ST69 is affirmative, and it is determined in ST71 that an abnormality has occurred in the oil temperature sensor 48, and the second lubrication circuit 24 is determined to be normal. On the other hand, when the difference S2 is less than or equal to the allowable range β in ST69, ST69 is denied and the process proceeds to ST70 corresponding to the control function of the abnormality determination unit 104, and the abnormality of the second lubrication circuit 24 is confirmed.

As described above, even when the abnormality of the lubricating circuit 14 is determined based on the variation ΔToil of the lubricating oil temperature Toil as in the present embodiment, the same effect as that of the above-described embodiments can be obtained.

FIG. 8 is a diagram schematically showing a structure of a lubrication circuit 121 which constitutes a lubrication device 120 according to still another embodiment of the present invention. The lubricating circuit 121 of the present embodiment is such that a part of the lubricating oil cooled by the oil cooler 44 is supplied to the catch tank 34, and the oil temperature sensor 132 is provided in the catch tank 34, and the lubricating circuit described above is used. It is different from 14. Incidentally, the gear mechanism 16, the bearing 18, the planetary gear 22, the case 26, the lubricating oil reservoir 28, the first strainer 30, the first discharge oil passage 32, the catch tank 34, the differential device 36, the second strainer 40, the second discharge oil. The passage 42 and the oil cooler 44 are basically the same as those of the lubricating circuit 14 of the above-described embodiment, and therefore, the same reference numerals are given and the description thereof will be omitted.

The lubricating circuit 121 includes a first lubricating circuit 122 provided for supplying the lubricating oil discharged from the first oil pump to the gear mechanism 16 and the bearing 18, and a lubricating oil discharged from the second oil pump P2. Is provided to the first electric motor MG1, the second electric motor MG2, and the planetary gear 22.

In the first lubricating circuit 122, the lubricating oil discharged by the first oil pump P1 is supplied to the gear mechanism 16 and the bearing 18 via the first discharging oil passage 32, and a part of the lubricating oil is supplied to the catch tank 34. It is temporarily stored. Further, the lubricating oil temporarily stored in the catch tank 34 is circulated to the lubricating oil storage portion 28 through the circulating oil passage 128 shown by the broken line.

In the second lubricating circuit 122, a part of the lubricating oil discharged by the second oil pump P2 is supplied to the planetary gear 22 and the first electric motor MG1 via the second discharging oil passage 42, and the remaining lubricating oil is supplied. Is cooled by the oil cooler 44 and then supplied to the cooling oil passage 130. The oil passage 130 for cooling is connected to the catch tank 34 so as to be able to be supplied to the lubrication essential parts (cooling essential parts) of the first electric motor MG1 and the second electric motor MG2. Therefore, a part of the lubricating oil supplied to the cooling oil passage 130 is supplied to the first electric motor MG1 and the second electric motor MG2, and the rest of the lubricating oil is supplied to the catch tank 34.

Further, in this embodiment, the catch tank 34 is provided with the oil temperature sensor 132. Since the first discharge oil passage 32 and the cooling oil passage 130 are connected to the catch tank 34, the lubricating oil flowing in the first discharge oil passage 32 and the lubricating oil flowing in the cooling oil passage 130 are separated from each other. It becomes a merging portion (oil sump) for merging, and an oil temperature sensor 132 is provided at this merging portion. In the present embodiment, the catch tank 34 corresponds to a confluence portion where the lubricating oil flowing in the first oil passage and the lubricating oil flowing in the second oil passage of the present invention merge.

Even in the lubricating device 120 configured as described above, by performing the same control as that in the above-described embodiment, the one oil temperature sensor 132 causes each of the first lubricating circuit 122 and the second lubricating circuit 124 to operate. The abnormality of can be determined.

For example, during EV traveling, only the first lubricating circuit 122 operates, so that the lubricating oil from the first lubricating circuit 122 is temporarily stored in the catch tank 34. Therefore, the abnormality of the first lubrication circuit 122 is determined based on the lubricating oil temperature Toil (or the change amount ΔToil) and the estimated oil temperature Test (or the change amount ΔTest) of the lubricating oil stored in the catch tank 34 during the EV traveling. be able to.

Further, when the engine is stopped, only the second lubricating circuit 124 operates, so that the lubricating oil from the second lubricating circuit 124 is temporarily stored in the catch tank 34. Therefore, the abnormality of the second lubrication circuit 124 can be determined based on the lubricating oil temperature Toil (or the change amount ΔToil) and the estimated oil temperature Test (or the change amount ΔTest) stored in the catch tank 34 when the stopped engine is driven. it can. The specific means for determining the abnormality of the first lubrication circuit 122 and the second lubrication circuit 124 is basically the same as that of the above-described embodiment, and detailed description thereof will be omitted.

FIG. 9 is a diagram schematically showing a structure of a lubrication circuit 141 which constitutes a lubrication device 140 according to still another embodiment of the present invention. The lubrication circuit 141 of this embodiment differs from the lubrication circuit 14 described above in that the catch tank 34 is not provided. The gear mechanism 16, the bearing 18, the planetary gear 22, the case 26, the lubricating oil reservoir 28, the first strainer 30, the differential device 36, the second strainer 40, the second discharge oil passage 42, the cooling oil passage 45, and the oil. The cooler 44 is basically the same as the lubricating circuit 14 of the above-described embodiment, and therefore, the same reference numerals are given and the description thereof is omitted.

The lubrication circuit 141 includes a first lubrication circuit 142 provided for supplying the lubricating oil ejected from the first oil pump P1 to the gear mechanism 16 and the bearing 18, and lubrication ejected from the second oil pump P2. A second lubricating circuit 144 provided for supplying oil to the first electric motor MG1, the second electric motor MG2, and the planetary gear 22 is configured.

In the first lubricating circuit 142, the lubricating oil discharged by the first oil pump P1 is supplied to the first discharge oil passage 146. The first discharge oil passage 146 is connected to the lubrication essential parts of the gear mechanism 16 and the bearing 18. Therefore, the lubricating oil supplied to the first discharge oil passage 146 is supplied to the gear mechanism 16 and the bearing 18 via the first discharge oil passage 146. The lubricating oil that has lubricated the gear mechanism 16 and the bearing 18 is recirculated to the lubricating oil reservoir 28 along the circulating oil passage (not shown) or the wall surface of the case 16.

In the second lubricating circuit 144, the lubricating oil discharged by the second oil pump P2 is supplied to the second discharge oil passage 42. The second discharge oil passage 42 is connected to the planetary gear 22 and a lubrication essential part of the first electric motor MG1 and is also connected to an oil cooler 44. Therefore, a part of the lubricating oil supplied to the first discharge oil passage 146 is supplied to the planetary gear 22 and the first electric motor MG1 via the second discharge oil passage 42, and the rest of the lubricating oil is supplied to the oil cooler 44. It is supplied and cooled. The lubricating oil cooled by the oil cooler 44 is supplied to the cooling oil passage 45. The cooling oil passage 45 is connected to the cooling essential parts of the first electric motor MG1 and the second electric motor MG2. Therefore, the lubricating oil supplied to the cooling oil passage 45 is supplied to the first electric motor MG1 and the second electric motor MG2 through the cooling oil passage 45, so that the first electric motor MG1 and the second electric motor MG2 are cooled. To be done.

Further, in the present embodiment, a position on the upstream side of the first discharge oil passage 146 to which the lubricating oil discharged from the first oil pump P1 is supplied (a position on the upstream side of the gear mechanism 16 and the bearing 18, The upstream side of the oil passage located in the vicinity of the oil pump P1 and the second discharge oil passage 42 to which the lubricating oil discharged from the second oil pump P2 is supplied (the planetary gear 22, the first electric motor MG1, the oil cooler). An oil passage located upstream of 44 and in the vicinity of the second oil pump P2) is provided with a proximity portion 148, and an oil temperature sensor 150 is provided in the proximity portion 148. The oil temperature sensor 150 is configured to be able to detect the lubricating oil temperature Toil of the lubricating oil flowing through the proximity portion 148. The first discharge oil passage 146 corresponds to the first oil passage that forms the first lubricating circuit of the present invention, and the second discharge oil passage 42 forms the second oil passage that forms the second lubricating circuit of the present invention. It corresponds to.

Even with the lubricating device 140 configured as described above, by performing the same control as that of the above-described embodiment, one oil temperature sensor 150 causes each of the first lubricating circuit 142 and the second lubricating circuit 144 to operate. The abnormality of can be determined.

For example, during EV traveling, since only the first lubrication circuit 142 operates, the lubricating oil temperature Toil (or change amount ΔToil) and the estimated oil temperature Test (or change amount ΔTest) detected by the oil temperature sensor 150 are set. Based on this, it is possible to determine the abnormality of the first lubrication circuit 142.

Further, since only the second lubrication circuit 144 operates when the engine is stopped, the lubricating oil temperature Toil (or change amount ΔToil) and the estimated oil temperature Test (or change amount ΔTest) detected by the oil temperature sensor 150 are set. Based on this, the abnormality of the second lubrication circuit 144 can be determined. The specific means for detecting an abnormality in the first lubrication circuit 142 and the second lubrication circuit 144 is basically the same as that in the above-described embodiment, and detailed description thereof will be omitted.

In the above-described first embodiment, for example, when the abnormality of the first lubricating circuit 20 is provisionally determined, the second oil pump P2 is driven and detected by the oil temperature sensor 48 after the driving of the second oil pump P2. The abnormality is determined based on the difference between the lubricating oil temperature Toil (or change amount ΔToil) and the estimated oil temperature Test (or change amount ΔTest). On the other hand, in the present embodiment, for example, when the abnormality of the first lubricating circuit 20 is tentatively determined during EV traveling, based on the lubricating oil temperature Toil of the lubricating oil before and after the driving of the second oil pump P2. The abnormality of the first lubrication circuit 20 is confirmed. Specifically, the lubricating oil temperature Toil (hereinafter, lubricating oil temperature Toil[i-1]) detected by the oil temperature sensor 48 before the second oil pump P2 is driven and the oil after the second oil pump P2 is driven. A difference S3 (=|Toil[i]−Toil[i-1]|) from the lubricating oil temperature Toil[i] detected by the temperature sensor 48 is calculated, and the difference S3 is set to a preset allowable threshold value γ. The abnormality of the first lubrication circuit 20 is determined based on whether the abnormality is greater than the above. Specifically, when the difference S3 is larger than the allowable threshold value γ, it is determined that the oil temperature sensor 48 is abnormal, and the first lubrication circuit 20 is determined to be normal. On the other hand, when the difference S3 is less than or equal to the allowable threshold value γ, the abnormality of the first lubrication circuit 20 is confirmed.

FIG. 10 is a flowchart illustrating a control operation for determining an abnormality of the first lubrication circuit 20 during EV traveling, which corresponds to the present embodiment. In the flowchart of FIG. 10, steps ST1 to ST7 are the same as those of the flowchart of FIG. 1 described above, and thus detailed description thereof will be omitted.

When the abnormality of the first lubrication circuit 20 is provisionally determined in step ST5 of FIG. 10, the engine is started from the EV running state in step ST6, whereby the second oil pump P2 is rotationally driven. In step ST7, the lubricating oil temperature Toil[i] of the lubricating oil detected by the oil temperature sensor 48 in the state where the second oil pump P2 is rotationally driven is acquired, and in ST80, the oil temperature before the second oil pump P2 is driven. The lubricating oil temperature Toil[i-1] detected and stored by the temperature sensor 48 (step ST2) is acquired, and in step ST81, the lubricating oil temperature Toil[i] acquired in step ST7 and in step ST80. It is determined whether the difference S3 from the acquired lubricating oil temperature Toil[i-1] is larger than the allowable threshold value γ. In ST81, when the difference S3 is larger than the allowable threshold value γ, the process proceeds to ST83, the abnormality of the oil temperature sensor 48 is determined, and the first lubrication circuit 20 is determined to be normal. On the other hand, if the difference S3 is smaller than the allowable threshold value in ST81, ST81 is denied and the abnormality of the first lubricating circuit 20 is confirmed in ST82.

Although the above-described flowchart of FIG. 10 determines the abnormality of the first lubrication circuit 20 during EV traveling, even when the abnormality of the second lubrication circuit 24 is determined when the stopped engine is driven, the first lubrication circuit 20 can be determined. The abnormality of the second lubrication circuit 24 can be determined based on the lubricating oil temperature Toil before and after the oil pump P1 is driven. Specifically, the difference S3 between the lubricating oil temperature Toil[i] acquired after driving the first oil pump P1 and the lubricating oil temperature Toil[i-1] acquired before driving the first oil pump P1. The abnormality of the second lubrication circuit 24 can be determined based on the above. Furthermore, the change amount ΔToil[i] of the current lubricating oil temperature Toil[i] and the change of the lubricating oil temperature Toil[i-1] acquired before the first oil pump P1 or the second oil pump P2 is driven. The abnormality of the first lubrication circuit 20 and the second lubrication circuit 24 may be determined based on the difference S4 from the amount ΔToil[i-1].

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be applied to other aspects.

For example, in the above-described embodiment, the second oil pump P2 is driven by the engine E/G, but may be driven by a pump driving electric motor for driving the second oil pump P2. .. In this case, when rotating the second oil pump P2, the pump driving electric motor is driven instead of the engine E/G.

Further, in the above-described embodiment, the first relation map and the second relation map are configured with the outside temperature Tair, the vehicle speed V, the first temperature Tmg1 of the first electric motor MG1, and the second temperature Tmg2 of the second electric motor MG2 as parameters. However, the relationship map may be composed of at least one of these parameters.

Further, in the above-described embodiment, the change amount ΔTest is calculated based on the estimated oil temperature Test obtained from the first relation map and the second relation map, but the change amount ΔTest of the estimated oil temperature Test is obtained. The relationship map may be obtained and stored in advance, and the change amount ΔTest may be directly calculated based on the relationship map.

Further, in the above-described embodiment, the first lubricating oil storage portion 28a, the second lubricating oil storage portion 28b, and the third lubricating oil storage portion 28c, which form the lubricating oil storage portion 28, are each partitioned by the partition wall. However, these partition walls may be removed to form one lubricating oil reservoir 28.

It should be noted that the above description is merely one embodiment, and the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

12, 120, 140: Lubricating device 20, 122, 142: First lubricating circuit 24, 124, 144: Second lubricating circuit 34: Catch tank (merging portion)
38: Circulating oil passage (first oil passage)
42: Second discharge oil passage (second oil passage)
46, 148: Proximity part 48, 132, 150: Oil temperature sensor 60, 100: Electronic control device (control device)
84 and 104: abnormality determination unit (determination unit)
146: First discharge oil passage (first oil passage)
P1: First oil pump P2: Second oil pump MG1: First electric motor (electric motor)
MG2: Second electric motor (electric motor)

Claims (1)

Lubrication comprising a first lubricating circuit for supplying the lubricating oil discharged from the first oil pump to the gear mechanism, and a second lubricating circuit for supplying the lubricating oil discharged from the second oil pump to the electric motor A device abnormality detection device,
The first oil passage forming the first lubrication circuit and the second oil passage forming the second lubrication circuit are close to each other , and the oil temperature of the lubricating oil flowing in the first oil passage and the second oil passage. proximity portions oil temperature is detectable of the lubricating oil flowing through the inner, or one in which the lubricating oil and lubricating oil flowing through the first oil passage through said second oil passage is provided in the merging unit for merging Two oil temperature sensors,
A controller for determining an abnormality of the first lubrication circuit and the second lubrication circuit,
When the first oil pump is driven and the second oil pump is stopped, the control device detects an abnormality in the first lubricating circuit based on the lubricating oil temperature detected by the oil temperature sensor. When the second oil pump is driven and the first oil pump is stopped, the abnormality of the second lubrication circuit is determined based on the lubricating oil temperature detected by the oil temperature sensor. An abnormality detection device for a lubrication device, which is functionally equipped with a determination unit.

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