JP4495550B2 - Oil circulation mechanism - Google Patents

Description

  The present invention relates to an oil circulation mechanism including an oil pan on the engine body side and a sub tank connected to the oil pan, and particularly relates to temperature adjustment of oil.

Conventionally, as shown in Patent Document 1 below, a technique of an oil circulation mechanism including an oil pan on the engine body side and a sub tank connected to the oil pan has been known. The configuration of such an oil circulation mechanism can be roughly divided into two types depending on the oil circulation system. First, as a first configuration, when comparing the capacity of the oil pan and the sub tank, if the capacity of the sub tank is large, the oil in the sub tank is difficult to flow into the oil pan of the engine body. Generally, an oil pump for circulating the oil is provided. On the other hand, in the second configuration, when the capacity of the oil pan and the sub tank is compared, when the capacity of the oil pan is large, the oil stored in the oil pan and the sub tank is relatively easy to circulate. No oil pump is needed. The oil circulation mechanism of either the first configuration or the second configuration basically includes an oil pan and a sub tank. This is because by providing not only an oil pan but also a sub tank and increasing the total amount of oil used, the effect of prolonging the span for performing maintenance by delaying the deterioration of the oil can be expected.
Japanese Patent Laid-Open No. 11-281199

  By the way, in such an oil circulation mechanism, the oil circulated for lubrication on the engine body side is warmed by the influence of the heat of the pistons and cylinders of the engine body, and is kept at a constant temperature, so that And stable operation at the rated output becomes possible. That is, it is generally known that it is desirable to operate the engine body at the oil temperature (ie, “oil temperature”) at which it can be operated most efficiently. However, since the oil circulation mechanism as described above is configured to increase the total amount of oil by providing a sub tank in addition to the oil pan, it is difficult to adjust the oil temperature. Therefore, for example, when starting the engine, it is desirable that the time for the oil temperature to reach the temperature at which the engine body can operate most efficiently is short. On the other hand, if the oil temperature becomes too high, the oil temperature should be lowered quickly. Is desirable. Accordingly, the present invention has been made in view of the above circumstances, and the object of the present invention is to easily adjust the oil temperature of an oil circulation mechanism including an oil pan and a sub tank and to operate the engine efficiently. It is to provide an oil circulation mechanism that enables this.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

In claim 1, the oil pan (30) provided in the engine body (10) and the sub tank (40) provided in the vicinity of the oil pan (30) are communicated via an oil passage, and the oil pan ( 30) In an oil circulation mechanism in which a partition plate (31) for separating the top and bottom is provided, and a hole (90) communicating in the vertical direction is provided on the partition plate (31), the partition in the oil pan (30) An open / close valve (61) made of an electromagnetic valve is provided in the upper oil passage (51) communicating with the space above the plate (31) and the sub tank , and the open / close valve (61) is controlled to open and close. When the engine body (10) is started for the first time, the controller (60) opens the on-off valve after the first set time has elapsed, while the engine body (10) is temporarily turned off. Stop It was as restarting after, and controls to open the on-off valve (61) within the second set time.

In claim 2, the oil pan (30) provided in the engine body (10) and the sub tank (40) provided in the vicinity of the oil pan (30) are communicated via an oil passage, and the oil pan ( 30) In an oil circulation mechanism in which a partition plate (31) for separating the top and bottom is provided, and a hole (90) communicating in the vertical direction is provided on the partition plate (31), the partition in the oil pan (30) The upper oil passage (51) communicating with the space above the plate (31) and the sub-tank (40) has an on-off valve (61) made of an electromagnetic proportional valve , and the oil in the oil pan (30). A temperature sensor (81) for measuring temperature; and a control unit (60) connected to the on-off valve (61) and the temperature sensor (81). The control unit (60) includes the temperature sensor (81) Based on the measured value, and controls the opening and closing valve (61).

  As effects of the present invention, the following effects can be obtained.

The oil pan (30) provided in the engine body (10) and the sub tank (40) provided in the vicinity of the oil pan (30) communicate with each other through an oil passage, and the oil pan ( 30) In an oil circulation mechanism in which a partition plate (31) for separating the top and bottom is provided, and a hole (90) communicating in the vertical direction is provided on the partition plate (31), the partition in the oil pan (30) An open / close valve (61) made of an electromagnetic valve is provided in the upper oil passage (51) communicating with the space above the plate (31) and the sub tank , and the open / close valve (61) is controlled to open and close. When the engine body (10) is started for the first time, the controller (60) opens the on-off valve after the first set time has elapsed, while the engine body (10) is temporarily turned off. Stopped When restarted, the control to open the on-off valve (61) within the second set time, for example, when the oil temperature becomes too high to cool the oil by flowing the oil to the sub-tank On the other hand, when the oil temperature is low, the oil temperature can be rapidly raised to the set temperature by circulating the oil without flowing into the sub tank.
Therefore, the engine body can be operated at the set temperature, and the fuel efficiency and the like of the engine body can be improved and the operation can be efficiently performed.

  In addition, the valve opening degree of the on-off valve can be freely controlled so that the oil temperature becomes the set temperature with an inexpensive and simple configuration.

In addition, by adopting an electromagnetic valve as the on-off valve, it becomes possible to finely control the oil temperature, unlike the case of using a thermostat, so the fuel efficiency of the engine body can be further improved and the engine efficiently It becomes possible to drive the main body.
In addition, by using a solenoid valve with an electromagnetic proportional valve or AC solenoid as the on-off valve, it is possible not only to fully open or close the on-off valve, but also to make fine adjustments to reduce or increase the valve opening. Therefore, the oil temperature can be finely adjusted.

In addition, since it is possible to secure a time (first set time) during which the on-off valve is closed at the first activation, it is possible to quickly raise the oil in a cold state to an appropriate oil temperature.
On the other hand, the oil is already warmed at the time of restart compared to the time of the first start, so at the time of restart it is possible to raise the oil temperature without requiring the same time as the first start. By setting the closing time as the second setting time shorter than the first setting time, it is possible to prevent the oil temperature from being raised excessively, thereby preventing the deterioration of the oil and appropriately adjusting the oil temperature. It becomes.
That is, it is possible to change the time during which the on-off valve is closed at the time of initial activation or restart, and it is possible to appropriately adjust the oil temperature.

The oil pan (30) provided in the engine body (10) and the sub tank (40) provided in the vicinity of the oil pan (30) communicate with each other via an oil passage, and the oil pan (30) is provided. In the oil circulation mechanism in which a partition plate (31) for separating the pan (30) up and down is provided, and a hole (90) communicating with the partition plate (31) in the up and down direction is provided, the oil pan (30) An open / close valve (61) comprising an electromagnetic proportional valve in an upper oil passage (51) communicating with the space above the partition plate (31) and the sub tank (40), and an oil pan (30) A temperature sensor (81) for measuring the temperature of the oil; and a control unit (60) connected to the on-off valve (61) and the temperature sensor (81), wherein the control unit (60) Temperature sensor (81) Based on the measured values, and controls the opening and closing valve (61), that it is possible to quickly set appropriately temperature oil temperature, operating stably and efficiently the engine body 10 at a low fuel consumption It becomes possible.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the accompanying drawings for understanding of the present invention.

  The following best mode for carrying out the present invention is an example embodying the present invention, and is not intended to limit the technical scope of the present invention.

  FIG. 1 is a schematic configuration diagram schematically showing an example of the oil circulation mechanism of the present invention.

  FIG. 2 is a flowchart showing an example of a series of processes performed by the control unit 60 of the oil circulation mechanism of the present invention.

  FIG. 3 is a schematic configuration diagram schematically showing an example of the oil circulation mechanism of the present invention.

  FIG. 4 is a flowchart showing an example of a series of processes performed by the control unit 60 of the oil circulation mechanism of the present invention.

<Outline configuration>
The schematic structure of the oil circulation mechanism of the present invention will be described with reference to FIG. The outline of the oil circulation mechanism of the present invention includes an engine main body 10 such as a diesel engine or a gasoline engine, an oil pan 30 provided in a lower portion of the engine main body 10 for storing oil circulated inside the engine main body 10, and the oil An outline is configured by including a sub-tank 40 communicating with the pan 30. Moreover, the case where the engine main body 10 demonstrated here is used as a power source of air-conditioning equipment, such as air-conditioning etc. by a gas heat pump system, is assumed, for example. In this case, the engine body 10 is activated or stopped in accordance with the control of the air conditioner.

<Oil pan 30>
First, as shown in FIG. 1, a partition plate 31 that separates the oil pan 30 in the vertical direction is provided inside the oil pan 30. Here, the space on the upper side of the oil pan 30 separated by the partition plate 31 is referred to as an oil receiving portion 71, while the space on the lower side of the oil pan 30 is referred to as an oil reservoir 72. The oil receiving portion 71 is connected by an oil passage communicating with the sub tank 40 side (hereinafter referred to as “upper oil passage 51”). That is, the oil receiving portion 71 directly receives the oil that has traveled around the engine body 10 and supplies it to the sub tank 40 via the upper oil passage 51. The upper oil passage 51 is provided with an on-off valve 61 described later. The oil reservoir 72 is located at the lower portion of the oil pan 30 and communicates with the lower portion (bottom portion) of the oil pan 30 and the lower portion (bottom portion) of the sub tank 40 (hereinafter referred to as “lower oil passage 52”). ) And a suction port at the lower end of the suction pipe 32 for sucking up oil into the engine body 10 (lubricating oil passage or the like). That is, an oil passage communicating with the sub tank 40 is provided in each of the oil receiving portion 71 and the oil reservoir portion 72. With this configuration, for example, when the on-off valve 61 is open, the oil in the oil reservoir 72 is sucked into the engine body 10 by the suction pipe 32 and at the same time the oil stored in the sub tank 40 is reduced. It is supplied to the oil reservoir 72 through the side oil passage 52. That is, the oil circulates as shown by the thick arrow in FIG. That is, oil that has traveled around the engine body 10 is first received by the oil receiving portion 71 and stored in the sub tank 40 via the upper oil passage 51. The oil in the bottom portion of the sub tank 40 flows into the oil reservoir 72 through the lower oil passage 52 due to the suction input by the oil in the oil reservoir 72 being sucked up by the suction pipe 32, and the engine main body is 10 is sucked up to 10 and travels around the inside of the engine body 10 to return to the oil receiving portion 71 again. That is, by providing the partition plate 31 in the oil pan 30 as described above, the oil in the oil pan 30 and the oil in the sub tank 40 circulate and can be used evenly. Therefore, the oil is uniformly deteriorated without being biased as compared with the conventional case, so that the maintenance interval such as oil replacement can be extended. In addition, the partition plate 31 is provided with a hole 90 that allows the oil receiving portion 71 and the oil reservoir 72 to communicate with each other. By providing the hole 90 in the partition plate 31 in this manner, for example, when the on-off valve 61 is open, part of the oil in the oil receiving portion 71 is released to the oil reservoir 72 through the hole 90, and the other When the on-off valve 61 is closed, the oil in the oil receiving portion 71 flows into the oil reservoir 72.

<Pressure equalizing pipe 41>
Further, in order to keep the pressure inside the sub tank 40 and the pressure of the crankcase of the engine body 10 or the oil pan 30 uniform, the engine body 10 and the sub tank 40 are communicated with each other by a pressure equalizing pipe 41. Yes. That is, by arranging the pressure equalizing pipe 41 between the side surface of the crankcase of the engine body 10 and the upper part of the sub tank 40, the interior of the space below the piston of the engine body 10 and the interior of the sub tank 40 are communicated. Since the pressure equalizing pipe 41 keeps the pressure in the space not filled with oil in the sub tank 40 and the oil pan 30 uniform, it is possible to prevent an imbalance in the liquid level. Furthermore, since there is no pressure difference between the sub tank 40 and the oil pan 30, there is no up and down movement of the oil level due to the pressure difference, so there is no false detection of the oil level, and the correct amount of oil is detected. The replenishment time and the like can be easily understood.

<Upper oil passage 51>
By the way, the above-described upper oil passage 51 has a step formed on the sub tank 40 side, as shown in FIG. The upper oil passage 51 is provided with a stepped step so that the oil receiving portion 71 side is high and the sub tank 40 side is low. Further, as shown in FIG. 1, the oil level in the oil pan 30, the sub tank 40, and the upper oil passage 51 is indicated by a dotted line, and a portion filled with oil is indicated by a dotted hatch. In this case, in the upper oil passage 51, the inlet side is higher than the liquid level, and the outlet side of the upper oil passage 51 (the portion having a low step on the sub tank 40 side) is lower than the liquid level (filled with oil). . Therefore, even if the exhaust gas flowing together with the oil from the engine body 10 side into the oil receiving portion 71 tries to flow into the sub tank 40, the low step portion (sub tank 40 side) of the upper oil passage 51 is filled with the oil. Does not flow into the sub tank 40. That is, since the step is formed so that the sub-tank 40 side of the upper oil passage 51 is filled with oil, the exhaust gas flows into the sub-tank 40 and contacts with the oil stored in the sub-tank 40, so that the oil deteriorates. This can be prevented.

<Open / close valve 61>
Further, an opening / closing valve 61 is provided at a step portion of the upper oil passage 51 on the sub tank 40 side. The on-off valve 61 is opened and closed based on the temperature (oil temperature) of oil circulating through the oil pan 30 and the sub tank 40. Specifically, the on-off valve 61 is configured to open when the oil temperature becomes equal to or higher than a preset temperature. The set temperature is an oil temperature at which the engine body 10 is efficiently operated, and is determined according to the use or application of the engine body 10 and is required in the development stage of the engine body 10. . Providing such an on-off valve 61 has the following advantages. When the oil is below the set temperature, the on-off valve 61 is closed, and the flow of the oil is roughly as follows: engine body 10 → oil pan 30 (oil receiving portion 71) → hole 90 → oil pan 30 (oil Reservoir 72) → circulates with engine body 10. That is, when the on-off valve 61 is closed, the oil in the oil receiving portion 71 does not flow into the sub tank 40 side. On the other hand, when the oil reaches the set temperature or higher, the on-off valve 61 is opened, so that the flow of the oil is roughly the engine body 10 → oil pan 30 (oil receiving portion 71) → sub tank 40 → oil pan 30. (Oil reservoir 72) → circulates with the engine body 10. That is, when the on-off valve 61 is opened, unlike the case where it is closed as described above, a flow can be made such that the oil in the oil receiving portion 71 flows into the sub tank 40 side. Since it is configured as described above, for example, when the oil temperature becomes too high, it is possible to cool the oil by flowing the oil into the sub tank 40. On the other hand, when the oil temperature is low, the oil is supplied to the sub tank. Since the oil temperature can be rapidly warmed to the set temperature by circulating without flowing into the engine 40, the fuel consumption of the engine body 10 can be improved and the engine can be operated efficiently.

<Thermostat>
For example, the on-off valve 61 can be configured to open and close with a thermostat. As the thermostat in this case, it is desirable to employ a thermostat that operates at the above-described set temperature (oil temperature at which the engine body 10 can be efficiently operated), or a bimetal or the like may be used. In this case, a configuration in which the valve is opened / closed by operating the solenoid by opening / closing the valve directly with the bimetal or by turning the electrical contact ON / OFF with the bimetal is also possible. With this configuration, the valve opening degree of the on-off valve 61 can be freely controlled so that the oil temperature becomes the set temperature with an inexpensive and simple configuration.

<Electromagnetic valve>
Further, instead of the thermostat, an electromagnetic valve that can adjust the valve opening based on the temperature of the oil may be employed as the on-off valve 61. As a specific example of such an electromagnetic valve capable of adjusting the valve opening (variable passage type), for example, an electromagnetic valve or an electromagnetic proportional valve can be used. In the case of a solenoid valve, it is desirable to employ, for example, one having an AC solenoid, and by controlling the current flowing through the AC solenoid by a pulse width modulation method (PWM method), the opening degree of the solenoid valve is proportional to the electromagnetic valve. The valve opening can be adjusted in the same manner as the valve. When an electromagnetic valve is employed as the on-off valve 61, as shown in FIG. 1, the on-off valve 61 and a temperature sensor 81 for measuring the temperature of oil in the oil pan 30 are provided. It connects to the control part 60 which is an example of the control means for controlling. Further, the control unit 60 may automatically control the engine body 10 based not only on the control of the on-off valve 61 but also on the setting of an air conditioner or the like in which the engine body 10 is provided. That is, the control unit 60 may control the engine body 10 and the entire air conditioner. With this configuration, the control unit 60 can perform opening / closing control of the opening / closing valve 61 based on the temperature measured by the temperature sensor 81. Specifically, the set temperature is stored in the control unit 60 in advance, and the control unit 60 compares the measured temperature (that is, the oil temperature) acquired from the temperature sensor 81 with the set temperature, and the measured temperature is set. When the temperature is higher than the temperature, the on-off valve 61 is opened. On the other hand, when the measured temperature is lower than the set temperature, the on-off valve 61 is closed. (Details will be described later with reference to FIG. 4.) By adopting an electromagnetic valve as the on-off valve 61 as described above, the oil temperature can be finely controlled unlike the case where the above-described thermostat is used. Therefore, the fuel efficiency of the engine body 10 can be further improved and the engine body 10 can be efficiently operated. Further, by using a solenoid valve having an electromagnetic proportional valve or an AC solenoid as the on-off valve 61, not only simply opening or closing the on-off valve 61 but also performing fine adjustment to reduce or increase the valve opening degree. Therefore, it is possible to finely adjust the oil temperature.

<S10 / S20 / S110>
Next, the case where different control is performed on the on-off valve 61 when the engine body 10 is initially started and when it is restarted will be described with reference to FIG. First, the engine main body 10 is activated by an activation operation performed by the operator (S10). The activation of the engine body 10 in the above step S10 means the first activation such as when the operator turns on the switch to use the air conditioner. That is, the time when the operation for operating the air conditioner is performed is the first activation time, and the on-off valve 61 is closed at this time. Subsequently, the control unit 60 determines whether or not the engine body 10 is restarted and the water temperature of the radiator exceeds 70 degrees (S20). The determination in step S20 is whether the control unit 60 has been restarted after the air conditioner is in an operation monitoring state and the engine body 10 is temporarily stopped by the automatic control of the control unit 60 itself after the processing of step S10. This is done by judging whether or not. That is, unlike the initial activation of step S10, it means a case where the engine body 10 is restarted after being temporarily stopped in a state where the air conditioner is operating under automatic control. Such a state of the engine body 10 is always grasped during operation. When the engine body 10 is temporarily stopped, the on-off valve 61 is closed to keep the oil temperature in preparation for restart. Moreover, in this step S20, the control part 60 acquires the measured value of the water temperature sensor provided in the radiator, and also judges whether the water temperature exceeds 70 degree | times, for example. Here, the reference water temperature is specifically set to 70 degrees, but the reference water temperature may be set to other than 70 degrees according to the type of the engine body 10 or the type of air conditioning equipment. If it is determined in step S20 that the engine body 10 is restarted and the water temperature is 70 degrees (reference temperature) or higher, the control unit 60, for example, within 30 seconds after the restart, Is opened (S110). That is, in step S110, the control unit 60 performs a process of opening the on-off valve 61 within a preset time (second set time) when the engine body 10 is restarted after being temporarily stopped. Yes.

<S30 / S120>
On the other hand, if it is determined in step S20 that the engine body 10 is restarted and the water temperature is not 70 degrees (reference temperature) or higher, the process proceeds to step S30. The control unit 60 determines whether or not, for example, 5 minutes have elapsed since the initial startup of the engine body 10 in step S110 (S30). In other words, in step S30, the control unit 60 determines whether or not the operation time from the initial startup of the engine body 10 has passed a preset time (first set time). In step S30, the determination reference time is set to 5 minutes. However, the reference time may be set to other than 5 minutes in accordance with the type of the engine body 10 or the type of air conditioning equipment. In the process of step S30, when it is determined that 5 minutes have elapsed since the engine body 10 was started for the first time, the control unit 60 performs a process of opening the on-off valve 61 (S120). When it is determined in the process of step S30 that the operation time from the initial activation of the engine body 10 has not passed 5 minutes, the process of step S30 is repeated. That is, in the state where the engine main body 10 is activated for the first time by the processing of step S30 and step S120, the opening / closing valve 61 is not opened until the first set time has elapsed. As described above, by performing the processes of steps S10, S20, S30, S110, and S120, it is possible to secure the time (first set time) during which the on-off valve 61 is closed at the first activation, so that the cooling state It is possible to quickly raise the oil to an appropriate oil temperature. On the other hand, since the oil is already warmed at the time of the restart compared to the time of the initial start, the oil temperature can be raised without requiring the same time as the time of the initial start. By setting the time during which the oil is closed as the second set time that is shorter than the first set time, the oil temperature will not be raised excessively, so that deterioration of the oil can be prevented and the oil temperature can be adjusted appropriately. It becomes possible. That is, by performing the processes of steps S10, S20, S30, S110, and S120, it is possible to change the time during which the on-off valve 61 is closed at the time of initial startup or restart, The temperature can be adjusted.

<Load (for torque)>
Next, as shown in FIG. 3 in addition to the configuration of FIG. 1, a rotation speed sensor 82 that measures the rotation speed of the engine body 10 and a load sensor 83 that measures the load of the engine are connected to the control unit 60. As a configuration, the oil temperature inside the oil pan 30 may be controlled to a set temperature. In this case, the control unit 60 calculates the fuel consumption based on the rotation speed and the load of the engine body 10 obtained by the rotation speed sensor 82 and the load sensor 83 to predict the oil temperature. The oil temperature is controlled to be the set temperature. The measurement target of the load sensor 83 is specifically the torque of the engine body 10 here. That is, the load sensor 83 functions as a torque sensor. Furthermore, a map showing the relationship among the engine speed, load (torque), fuel consumption, and predicted oil temperature (oil temperature) is stored in the control unit 60 as data relating to the engine body 10 in advance. Let me. By configuring in this way, the control unit 60 specifically calculates the fuel consumption and the oil temperature corresponding to the engine speed and torque obtained from the speed sensor 82 and the load sensor 83 from the map. Is possible. By the way, it is impossible to show four or more relationships as described above in one map on a three-dimensional map or the like. Therefore, for example, the relationship between “engine speed”, “load”, and “fuel consumption” is shown as the first map, and the relationship between “fuel consumption” and “oil temperature” is shown as the second map. Things may be stored in the control unit 60. That is, the controller 60 first calculates the fuel consumption amount from the engine speed and the load using the first map, and then uses the second map to calculate the predicted oil temperature from the fuel consumption amount. Will be calculated. This makes it possible to predict the oil temperature from the engine speed and the load value even in a situation where the load or the like is small and the oil temperature is difficult to rise. Predictive execution is possible. Further, even when the temperature sensor 81 fails, it is possible to predict and know (estimate) the oil temperature from the relationship between the engine speed and the load as described above.

<Load (for output)>
In the above description, the load is considered as torque, but this load may be considered as follows. A no-load output map in which a no-load output curve showing a relationship between the throttle opening and the output of the engine body 10 at no load is stored in the control unit 60 in advance. In this case, the control unit 60 may be a method that considers the difference between the actual throttle opening and the output of the engine body 10 and the no-load output map as a load. That is, in this case, unlike the case where the above-described load is considered as torque, it is known how much the actual output of the engine body 10 has decreased (deviation) from the no-load output (map value). Of course, in this case, the load sensor 83 measures the actual output of the engine body 10.

<Temperature sensor>
Next, “a case where the control unit 60 controls opening / closing of the opening / closing valve 61 based on the measured value of the temperature sensor 81”, which has already been described a little, will be described with reference to FIG. Here, it is assumed that the on-off valve 61 is specifically an electromagnetic proportional valve, and the set temperature serving as a reference for operating the on-off valve 61 is stored in advance in the control unit 60 as described above. First, the engine main body 10 is activated by an activation operation performed by the operator (S10). The activation in step S10 means the first activation described above. Next, the control unit 60 determines whether or not the measured value of the temperature sensor 81 is larger than the set temperature stored in the control unit 60 itself (S60). That is, in the determination in step S60, it is determined whether or not the measured value of the temperature sensor 81, that is, the oil temperature of the oil pan 30 is higher than the set temperature. If it is determined in step S60 that the oil temperature is higher than the set temperature, the process proceeds to step S130. On the other hand, if it is determined that the oil temperature is lower than the set temperature, the process proceeds to step S140. Transition. In the process of step S130, the control unit 60 performs a process of opening the on-off valve 61 (S130). On the other hand, in the process of step S140, the control unit 60 performs a process of closing the on-off valve 61 (S140). That is, when it is determined in step S60 that the oil temperature is higher than the set temperature, the oil is cooled by circulating the oil through a route passing through the sub tank 40. On the other hand, if it is determined in step S60 that the oil temperature is lower than the set temperature, the oil temperature is set to the set temperature by suppressing the cooling of the oil by circulating the oil through a path that does not pass through the sub tank 40. Control to approach. Of course, since an electromagnetic proportional valve is used as the on-off valve 61, the opening degree of the on-off valve 61 may be adjusted in accordance with the magnitude of the difference between the actual oil temperature and the set temperature. As described above, the controller 60 controls the opening / closing valve 61 to open and close based on the temperature sensor 81, so that the oil temperature can be quickly and appropriately set to the set temperature. It becomes possible to drive efficiently.

The schematic block diagram which showed typically an example of the oil circulation mechanism of this invention. The flowchart which showed an example of a series of processes which the control part 60 of the oil circulation mechanism of this invention performs. The schematic block diagram which showed typically an example of the oil circulation mechanism of this invention. The flowchart which showed an example of a series of processes which the control part 60 of the oil circulation mechanism of this invention performs.

DESCRIPTION OF SYMBOLS 10 Engine main body 30 Oil pan 31 Partition plate 32 Intake pipe 40 Sub tank 51 Upper oil passage 52 Lower oil passage 60 Control part 61 On-off valve 81 Temperature sensor 82 Revolution sensor 83 Load sensor

Claims (2)

The oil pan (30) provided in the engine body (10) and the sub tank (40) provided in the vicinity of the oil pan (30) communicate with each other through an oil passage, and the oil pan (30) is separated vertically. In an oil circulation mechanism in which a partition plate (31) is provided and a hole (90) communicating in the vertical direction is provided on the partition plate (31), the oil pan (30) is located above the partition plate (31). And an on- off valve (61) made of an electromagnetic valve in the upper oil passage (51) communicating with the sub-tank, and a controller (60) for controlling on-off of the on-off valve (61) When the engine body (10) is started for the first time, the controller (60) opens the on-off valve after the first set time has elapsed, while the engine body (10) is restarted after being temporarily stopped. Sometimes Oil circulation mechanism and controls to open the closing valve (61) within the second set time. The oil pan (30) provided in the engine body (10) and the sub tank (40) provided in the vicinity of the oil pan (30) communicate with each other through an oil passage, and the oil pan (30) is separated vertically. In an oil circulation mechanism in which a partition plate (31) is provided and a hole (90) communicating in the vertical direction is provided on the partition plate (31), the oil pan (30) is located above the partition plate (31). An on- off valve (61) comprising an electromagnetic proportional valve in the upper oil passage (51) communicating with the sub-tank (40) and a temperature sensor for measuring the temperature of oil in the oil pan (30) (81) and a control unit (60) connected to the on-off valve (61) and the temperature sensor (81), and the control unit (60) is a measured value of the temperature sensor (81). Based on Oil circulation mechanism and controlling a closing (61).

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