JP5607010B2 - Oil pump system for vehicles - Google Patents

Description

  A technique related to an oil pump that generates hydraulic pressure in a vehicle is disclosed below.

  For example, as disclosed in Patent Document 1, when lubricating oil used for engines and transmissions is cooled to a very low temperature in a cold region where the temperature drops to 10 ° C. or 20 ° C. below freezing point, the viscosity increases, It is known that the load of an oil pump that generates hydraulic pressure increases.

JP 2011-000978 A

  A mechanical oil pump, which is a main pump that is driven by an engine and generates hydraulic pressure, sucks oil from an oil pan through a suction pipe (strainer). In this suction pipe, if the viscosity of the oil increases at the start of operation, the mechanical oil pump sucks out the air accumulated between the oil level in the suction pipe and the mechanical oil pump, and before the oil starts to be sucked up. , Take longer. That is, when the mechanical oil pump starts operating, it takes a longer time to suck in and idle, which causes a longer time than usual to supply the required hydraulic pressure.

The vehicle oil pump system proposed to solve this problem is
A mechanical oil pump driven by an engine;
The suction pipe for the mechanical oil pump sucks oil from the oil pan, said a position lower than the oil surface of the oil pan, and lower than the oil level of the oil pan at a predetermined low oil temperature state An electric oil pump having a suction pipe communicating with a position higher than the oil level in the suction pipe;
And a control device that controls the electric oil pump so as to suck out the air in the suction pipe.
Then, the control device, the oil temperature of the mechanical oil pump discharge side to come to be lower than a predetermined temperature, performing deaeration process of the suction tube by operating the electric oil pump. Alternatively, when the increase in hydraulic pressure on the discharge side of the mechanical oil pump is not detected, the electric oil pump is operated to perform the air bleeding process in the suction pipe.
In addition, the oil pump system for vehicles proposed to solve this problem is
A mechanical oil pump driven by an engine;
A first suction pipe communicating with a suction pipe for sucking oil from the oil pan by the mechanical oil pump at a site below the oil level of the oil pan; and a site above the oil level of the oil pan An electric oil pump having a second suction pipe communicating with
An air vent that raises the oil level in the suction pipe to the position of the second suction pipe by controlling the electric oil pump so that the air in the suction pipe is sucked out by the first and second suction pipes. And a control device that performs processing.

In the vehicle oil pump system according to the above proposal, the electric oil pump can suck air from the suction pipe of the mechanical oil pump, and the time that the mechanical oil pump idles by reducing the air sucked by the mechanical oil pump. Can be shortened. As a result, it is possible to generate and start supplying hydraulic pressure more quickly from the mechanical oil pump after the operation starts.
In other words, according to this oil pump system, when the oil temperature is high and the viscosity is low, that is, under the condition that there is little influence of air accumulation and the necessity for air venting is low, it is possible to immediately shift to hydraulic supply by a mechanical oil pump.
Further, if it is confirmed that the hydraulic pressure on the discharge side of the mechanical oil pump is increased, it can be determined that there is no influence of the air accumulation, and it is not necessary to remove the air, so that it is possible to immediately shift to hydraulic supply by the mechanical oil pump.
Furthermore, since the oil level in the suction pipe can be raised closer to the mechanical oil pump, the mechanical oil pump can suck up the oil more quickly and start supplying hydraulic pressure.

Schematic which showed 1st Embodiment of the oil pump system for vehicles. Schematic which showed 2nd Embodiment of the oil pump system for vehicles. The flowchart which showed the 1st example of the air bleeding process which a control apparatus performs. The flowchart which showed the 2nd example of the air bleeding process which a control apparatus performs. The flowchart which showed the 3rd example of the air bleeding process which a control apparatus performs. The flowchart which showed the 4th example of the air bleeding process which a control apparatus performs. The flowchart which showed the 5th example of the air bleeding process which a control apparatus performs. The flowchart which showed the 6th example of the air bleeding process which a control apparatus performs. The flowchart which showed the 7th example of the air bleeding process which a control apparatus performs. The flowchart which showed the 8th example of the air bleeding process which a control apparatus performs.

  In this embodiment, an electric oil pump is used as an auxiliary oil pump driven by a power source other than the engine. For example, in the case of a hybrid vehicle, an electric oil pump driven by an electric motor is provided in order to maintain a necessary hydraulic pressure when the engine is stopped. That is, an electric oil pump is auxiliary installed in parallel to the main mechanical oil pump driven by the hybrid engine, and the required oil pressure is supplied from the oil pan by the electric oil pump while the engine is stopped (for example, (See the aforementioned Patent Document 1). Moreover, even if it is not a hybrid engine, when it has an idling stop function, it also has an electric oil pump to maintain the hydraulic pressure required when the engine is stopped. In the present embodiment, such an electric oil pump is used and controlled for bleeding the suction pipe of a mechanical oil pump.

FIG. 1 shows a first embodiment of a vehicle oil pump system.
The mechanical oil pump 1 is connected to the engine EN via the clutch CL, and is driven by the engine EN to generate hydraulic pressure and provide it to each hydraulic device OD of the vehicle. The clutch CL that connects the engine EN and the mechanical oil pump 1 includes a normally OFF type that connects the clutch by hydraulic pressure, and a normally ON type that releases the clutch by hydraulic pressure. Both types are included in this embodiment. Applicable. In addition, there is a type in which the engine EN and the mechanical oil pump 1 are directly connected without using the clutch CL, but this is also applicable.
The mechanical oil pump 1 sucks up oil from the oil pan OP using a suction pipe (strainer) 1a. A mesh 1b is provided as a foreign matter removing filter near the suction port at the tip of the suction pipe 1a.

The electric oil pump 2 generates hydraulic pressure as an auxiliary while the mechanical oil pump 1 is stopped, and provides it to the hydraulic device OD. The electric oil pump 2 uses an electric motor as a drive source and is controlled by a control device 3. The suction pipe 2a of the electric oil pump 2 communicates with the suction pipe 1a of the mechanical oil pump 1, and sucks oil from the oil pan OP through the suction pipe 1a during normal operation. That is, the suction pipe 2a has a tip suction port that opens into the suction pipe 1a and sucks oil in the suction pipe 1a.
In the first embodiment of FIG. 1, the suction pipe 2a communicates with the suction pipe 1a at a portion below the oil level of the oil pan OP. Specifically, even when the oil level is inclined due to the inclination of the vehicle or the deviation of oil during turning, the suction port of the suction pipe 2a is located below the oil level in the suction pipe 1a (from the oil level). In consideration of the fact that the oil does not come out), the suction pipe 1a is communicated with a portion below the oil level in the normal suction pipe 1a. In this way, the portion of the suction pipe 1a that communicates with the suction pipe 2a can be below the oil level and above or below the mesh 1b, but communicates above the mesh 1b (oil side). This is preferable when the pressure loss of the mesh 1b is taken into consideration. In this case, the lower limit position of the suction pipe 2a is set to a delay time that is allowed until the mechanical oil pump 1 starts supplying hydraulic pressure in the assumed use temperature range of the vehicle (or the oil pump operation guarantee temperature range). The oil level required based on this is taken into account. For example, the height of the oil level at which the mechanical oil pump 1 can start sucking oil within the allowable delay time at the lowest expected oil temperature is considered.

FIG. 2 shows a second embodiment of the vehicle oil pump system. The second embodiment is a form in which a parallel structure of a first suction pipe 2b and a second suction pipe 2c is adopted for the suction pipe of the electric oil pump 2. Other mechanical oil pump 1, its suction pipe 1a, electric oil pump 2, control device 3 and the like are the same as those in the first embodiment.
In the second embodiment, the first suction pipe 2b communicates with the suction pipe 1a at a part below the oil level of the oil pan OP, and the second suction pipe 2c is a part above the oil level of the oil pan OP. To communicate with the suction pipe 1a. The portion of the suction pipe 1a that communicates with the first suction pipe 2b can be below the oil level and above or below the mesh 1b, as in the first embodiment.

  Oil that circulates during engine operation stirs with the rotation of the components in the mission and traps air. The trapped air is released from the oil that has returned to the oil pan OP, but when the air is released in the suction pipe 1a, it can accumulate above the suction pipe 1a and generate an air reservoir. If the mechanical oil pump 1 is in operation, both the discharged air and the oil are sucked up so that the suction operation is not affected. However, when both the oil pumps 1 and 2 are stopped, the air discharged from the oil is sucked into the suction pipe 1a. And the oil level in the suction pipe 1a can be pushed below the oil level of the oil pan OP. Air trapped in the oil quickly escapes from the oil if the viscosity of the oil is low. Therefore, the air is exhausted one after another by the operating mechanical oil pump 1 and hardly remains. However, if the viscosity of the oil is high, it remains in the oil until it stops after the mechanical oil pump 1 is stopped (in many cases, when the engine is stopped). It is easy to collect in the air, and the air reservoir becomes larger.

  For example, if the viscosity of oil increases in a cold region as described above, an air reservoir is easily generated as described above. Therefore, as shown by the dotted lines in FIGS. 1 and 2, the air reservoir becomes large and suction is performed while the pump is stopped. The oil level falls in the pipe 1a, and the gap between the oil level and the mechanical oil pump 1 opens. Then, for a while after the operation is started, the mechanical oil pump 1 is idled by sucking only air until the air accumulation is eliminated. If the viscosity of the oil is low (if the oil temperature is high), since the suction resistance is low, the oil level rises easily and air is discharged early, but if the oil viscosity is high (if the oil temperature is low) Since the suction resistance is high (oil does not flow easily), the oil level is difficult to rise and the discharge of air is delayed. Therefore, the control device 3 controls the electric oil pump 2 and quickly eliminates air accumulation. That is, the electric oil pump 2 sucks air from the suction pipe 1a of the mechanical oil pump 1 and raises the oil level by negative pressure, thereby shortening the time for the mechanical oil pump 1 to suck in and idle. As a result, it is possible to quickly generate and start supplying hydraulic pressure from the mechanical oil pump 1 when the engine EN is started.

  The control device 3 for controlling the electric oil pump 2 is constituted by a microcomputer or the like according to a built-in program, and executes processing according to the flowchart shown in FIG. The electric oil pump 2 is controlled so as to suck out the air.

  When the engine starts, that is, when the ignition switch is turned on, the control device 3 determines the current oil temperature of the oil in the oil pan OP based on the output value of the temperature sensor TS in step S1. The oil temperature judgment is a condition judgment for starting the air bleeding process. When the oil temperature is equal to or higher than a predetermined temperature and the viscosity is low and can be sucked up easily by a negative pressure, that is, there is little influence of air accumulation, When the necessity is low, it is determined that the air bleeding process is unnecessary. Therefore, when the oil temperature is equal to or higher than the predetermined temperature determined in accordance with the characteristics of the oil in step S1, the process jumps to step S6 to complete the air bleeding, and immediately shifts to the hydraulic pressure supply by the mechanical oil pump 1. As described above, the control device 3 determines whether or not the air bleeding process in the suction pipe 1a is necessary. When it is determined that the air bleeding process is necessary, the control device 3 drives the electric oil pump 2 to perform air bleeding.

  In addition, as another example of determination in the oil temperature determination in step S1, a temperature range, that is, “low temperature side predetermined temperature <oil temperature <high temperature side predetermined temperature” may be determined. If the oil temperature is too low, there is a concern that the rotation of the electric oil pump 2 may be insufficient. At this time, the air bleeding process using the electric oil pump 2 is omitted. Further, when a failure of the oil temperature sensor that detects the oil temperature is detected, it is preferable to perform control so that the air venting process is always performed as fail-safe.

  When the oil temperature is lower than the predetermined temperature in step S1, the control device 3 drives the electric oil pump 2 in step S2 and starts a process of sucking out the air in the suction pipe 1a. When the drive of the electric oil pump 2 is started, the control device 3 monitors the change of the drive current to determine the completion of air bleeding. However, the drive current of the electric oil pump 2 is generally transient at startup. This transient state is not mistaken for the completion of bleeding. For this purpose, the control device 3 waits for the elapse of a predetermined time corresponding to the transition period (that is, a judgment mask time) in step S3. During this time, for example, the control device 3 for several milliseconds to several seconds does not determine the change in the drive current as a condition for completing the air bleeding.

  When the predetermined time elapses, the control device 3 monitors whether or not the drive current of the electric oil pump 2 exceeds a threshold value in step S4. The drive current changes according to the load of the electric oil pump 2. That is, the load when the electric oil pump 2 sucks air through the suction pipe 2a is light, but when the air is completely exhausted and the oil starts to be sucked up through the suction pipe 2a, the load increases rapidly. The control device 3 monitors the change of the drive current according to the load fluctuation, and determines the completion of air bleeding when the drive current reaches a threshold value determined by the pump characteristics. Therefore, the control device 3 stops the electric oil pump 2 in step S5 when the drive current becomes equal to or greater than the threshold value, executes the air bleeding completion process in step S6, and ends.

  The air bleeding completion process in step S6 includes a process of shifting the control of the electric oil pump 2 to the control according to the operating state of the engine. At this time, depending on the type of the mechanical oil pump 1, when the mechanical oil pump 1 is directly connected to the engine EN (without the clutch CL), the mechanical oil pump 1 is turned on when the ignition switch is turned on. Since the operation has started, the operation is maintained and the operation proceeds to the hydraulic pressure supply. Even when the mechanical oil pump 1 connected to the engine EN via the clutch CL is of a normally ON type, the mechanical oil pump 1 starts operating when the ignition switch is turned on, so that the operation is maintained and hydraulic pressure is supplied. Migrate to In this case, the clutch can be turned off when the hydraulic pressure supply is started. On the other hand, when the mechanical oil pump 1 connected to the engine EN via the clutch CL is normally OFF type, the electric oil pump is not operated until the air bleeding completion process, and the electric oil pump is operated in steps S2 to S5. 2 can be operated in advance. Then, the electric oil pump 2 is stopped and the mechanical oil pump 1 is operated in the process of completing air bleeding in step S6, and hydraulic pressure supply is started. Alternatively, the operation is continued without stopping the electric oil pump 2 in step S5, the operation of the mechanical oil pump 1 is started in step S6, and the hydraulic pressure is confirmed by the hydraulic sensor. It may be a process of stopping.

  If the time until the electric oil pump 2 is stopped in step S5 is set to be long, the hydraulic oil supply by the electric oil pump 2 can be executed during that time. It can also be implemented. Further, regarding the electric oil pump 2, since the volumetric efficiency change due to the pump clearance is small at a low temperature, the specification capable of generating a larger negative pressure is the clearance MAX (small friction). Can be sucked out a lot.

  As a result of executing the above air venting process, as shown in FIGS. 1 and 2, the air in the suction pipe 1a is sucked out and the oil level in the suction pipe 1a rises as shown by the arrow. In the case of FIG. 1, the oil level rises to the position of the suction pipe 2a in the suction pipe 1a when the electric oil pump 2 sucks out air. At this time, since the suction pipe 2a is provided in a portion below the oil level of the oil pan OP, the ascending portion is raised. Therefore, the portion of the suction pipe 1a that communicates with the suction pipe 2a is preferably closer to the oil surface of the oil pan OP. Since the oil level in the suction pipe 1a rises to the same level as the oil level of the oil pan OP, the mechanical oil pump 1 can suck up oil and start supplying hydraulic pressure in the same manner as usual. On the other hand, in the case of FIG. 2, when the electric oil pump 2 sucks out air, the oil level rises in the suction pipe 1a to the position of the suction pipe 2c above the oil level of the oil pan OP. Since the oil level in the suction pipe 1a rises to the vicinity of the main body of the mechanical oil pump 1 above the oil level of the oil pan OP, the mechanical oil pump 1 sucks up oil more quickly and starts supplying hydraulic pressure. can do.

FIG. 4 shows a second example of the air bleeding process executed by the control device 3.
In the flowchart of FIG. 4, steps S1 to S6 executed by the control device 3 are the same as in the first example of FIG. In the second example, when the drive current does not reach the threshold value in the determination in step S4, the control device 3 determines in step S10 whether or not a predetermined failure determination time has elapsed. Returning to step S4, the drive current is determined. If it is determined in step S10 that the failure determination time has elapsed, the control device 3 determines in step S11 that the electric oil pump 2 has failed, for example, damage to the suction pipe 2a, and the electric oil pump 2 cannot be used. Is set to, and a fail safe is performed by supplying hydraulic pressure only by the mechanical oil pump 1.

  The failure determination in step S11 is, for example, that when a failure is determined in step S10, a failure flag is set, and from step S11, the process returns to step S1 to repeat each step. Can be determined as a failure when the number of times reaches a predetermined number. Alternatively, a step of confirming the oil temperature may be added after step S11, and the failure determination may be made based on the result of comparing the failure determination threshold temperature separately determined for failure determination and the current oil temperature. That is, in the additional step, if the oil temperature is lower than the failure determination threshold temperature, the process is repeated again from step S1, while if the oil temperature is equal to or higher than the failure determination threshold temperature, a failure is determined. That is, a control for determining a failure is added when the drive current does not change despite the oil temperature rising. In this way, more reliable failure determination can be performed by performing multiple times of failure confirmation and temperature confirmation.

FIG. 5 shows a third example of the air bleeding process executed by the control device 3.
In the flowchart of FIG. 5, steps S1 to S6 executed by the control device 3 are the same as in the first example of FIG. In the third example, when the drive current does not reach the threshold value in the determination in step S4, the control device 3 determines in step S20 whether or not the oil temperature reaches the same predetermined temperature as that in step S1. While the temperature falls below the predetermined temperature, the process returns to step S4 to determine the drive current. On the other hand, when the oil temperature has reached the predetermined temperature, the control device 3 executes the air bleeding completion process in step S6 as air bleeding completion. When the oil temperature rises quickly and air venting is no longer necessary, the operation proceeds to hydraulic pressure supply by the mechanical oil pump 1 at an early stage even during the air venting process.

FIG. 6 shows a fourth example of the air bleeding process executed by the control device 3.
In the flowchart of FIG. 6, steps S2 to S6 executed by the control device 3 are the same as in the first example of FIG. In the fourth example, the judgment conditions for starting the air bleeding process are different from those in the first example. That is, in step S1-A of the fourth example, the control device 3 monitors the output of the hydraulic sensor PS provided on the discharge side of the mechanical oil pump 1, and determines whether or not an increase in the discharge side hydraulic pressure is detected. Judging. If it is confirmed that the oil pressure has risen, it is not necessary to remove air, so that the air removal is completed (step S6), and the flow proceeds to hydraulic pressure supply. On the other hand, if an increase in hydraulic pressure is not detected, the control device 3 executes an air bleeding process after step S2.

FIG. 7 shows a fifth example of the air bleeding process executed by the control device 3.
In the flowchart of FIG. 7, steps S2 to S6 executed by the control device 3 are the same as in the first example of FIG. In the fifth example, the condition judgment (step S1) for starting the air bleeding process is not performed, and the air bleeding process of steps S2 to S6 is always executed every time the engine is started. Since a small amount of air enters the suction pipe 1a, a system may be adopted in which air is released every time the engine is started.

FIG. 8 shows a sixth example of the air bleeding process executed by the control device 3.
In the flowchart of FIG. 8, the control device 3 executes the same steps S1, S2, S5, and S6 as in the first example of FIG. In the sixth example, the judgment conditions (steps S3 to S4) for completing the air bleeding process are different from those in the first example. That is, in step S4-A of the sixth example, the control device 3 determines whether or not a predetermined air bleeding time has elapsed, and when the air bleeding time has elapsed, the air bleeding process is completed as a step. Proceed to S5. The air bleeding time can be calculated in advance from the capacity of the electric oil pump 2 and the volume of the suction pipe 1a.

FIG. 9 shows a seventh example of the air bleeding process executed by the control device 3.
In the flowchart of FIG. 9, the control device 3 executes the same steps S1, S2, S5, and S6 as in the first example of FIG. The seventh example also differs from the first example in the determination conditions (steps S3 to S4) for completing the air bleeding process. That is, in step S4-B of the seventh example, the control device 3 determines whether or not the electric oil pump 2 has rotated a predetermined number of times or more, and when the pump rotation has reached the predetermined number of times, The air bleeding process is completed and the process proceeds to step S5. The predetermined number of times as a determination criterion can be calculated in advance from the pump discharge amount per rotation and the volume of the suction pipe 1a.

FIG. 10 shows an eighth example of the air bleeding process executed by the control device 3.
In the flowchart of FIG. 10, the control device 3 executes the same steps S1, S2, S5, and S6 as in the first example of FIG. The eighth example also differs from the first example in the determination conditions (steps S3 to S4) for completing the air bleeding process. That is, in step S4-C of the eighth example, the control device 3 monitors the output of the hydraulic sensor provided on the discharge side of the mechanical oil pump 1 and determines whether or not an increase in hydraulic pressure is detected. . If the increase in hydraulic pressure is confirmed, the air is extracted and the process is completed, and the process proceeds to step S5.

  The flowcharts of the first to eighth examples described above can be executed in appropriate combination.

  The technical ideas other than the claims that can be grasped from the above embodiment will be described below together with the effects.

(A) In the vehicle oil pump system according to any one of claims 1 to 3 ,
The controller is
An oil pump system for a vehicle that controls the electric oil pump so as to suck out air in the suction pipe when the engine is started.
According to this oil pump system, air is released every time the engine is started regardless of the oil temperature, and if air is in the suction pipe, it is sucked out.

(B) In the vehicle oil pump system according to any one of claims 1 to 3 or (A) ,
The controller is
An oil pump system for a vehicle that drives the electric oil pump so as to suck out air in the suction pipe, and determines completion of bleeding of the suction pipe based on a drive current of the electric oil pump.
According to this oil pump system, the control device monitors the drive current of the electric oil pump, and compares the drive current that changes according to the load with a threshold value, for example, to determine whether the suction pipe has been vented. It can be determined whether or not.

(C) In the vehicle oil pump system according to claim (b) ,
The controller is
A vehicle oil pump system that does not determine a change in the drive current before a predetermined time has elapsed after the drive of the electric oil pump is started.
According to this oil pump system, the mask time can be provided so that the transient current at the start of the electric oil pump is not mistaken for a change in the drive current due to the load.

(D) In the vehicle oil pump system according to any one of claims 1 to 3 or (a) ,
The controller is
An oil pump system for a vehicle that drives the electric oil pump so as to suck out air in the suction pipe, and judges completion of air bleeding of the suction pipe when a predetermined air bleeding time has elapsed.
According to this oil pump system, the control device can determine whether or not the air bleeding of the suction pipe has been completed based on the air bleeding time that can be calculated from the capacity of the electric oil pump and the volume of the suction pipe. it can.

(E) In the vehicle oil pump system according to any one of claims 1 to 3 or (a) ,
The controller is
An oil pump system for a vehicle that drives the electric oil pump so as to suck out air in the suction pipe, and determines completion of air bleeding from the suction pipe when the electric oil pump rotates a predetermined number of times or more. .
According to this oil pump system, the control device determines whether or not the suction pipe has been vented based on the number of rotations of the pump that can be calculated from the discharge amount per rotation of the electric oil pump and the volume of the suction pipe. Can be determined.

(F) In the vehicle oil pump system according to any one of claims 1 to 3 or (A) ,
The controller is
An oil pump for a vehicle that drives the electric oil pump so as to suck out air in the suction pipe, and determines completion of bleeding of the suction pipe when an increase in discharge-side hydraulic pressure of the mechanical oil pump is recognized. system.
According to this oil pump system, the control device can determine whether or not the bleeding of the suction pipe is completed based on the output value of the hydraulic sensor provided on the discharge side of the mechanical oil pump.

(G) In the vehicle oil pump system according to any one of claims 1 to 3 or (A) to (F) ,
The controller is
It is determined whether or not a failure determination time elapses between the time when the electric oil pump is driven to suck out the air in the suction pipe and the time when the completion of bleeding of the suction pipe is determined. A vehicle oil pump system that determines that a failure occurs when the determination time has elapsed.
According to this oil pump system, the control device can determine the failure of the electric oil pump and can determine to stop using the failed electric oil pump. In this case, in order to determine the failure more reliably, the control device determines the failure when the number of times the failure is determined reaches a predetermined number, or when a failure is determined at an oil temperature higher than a predetermined temperature. You can also

(H) In the vehicle oil pump system according to any one of claims 1 to 3 or (b) to (f) ,
The controller is
It is determined whether or not the oil temperature of the oil reaches a predetermined temperature after the electric oil pump is driven so as to suck out the air in the suction pipe and before the completion of air bleeding of the suction pipe is determined. When the predetermined temperature is reached, the vehicle oil pump system determines completion of air bleeding from the suction pipe.
According to this oil pump system, when the oil temperature rises quickly and air bleed is no longer necessary, the control device can shift to hydraulic supply by a mechanical oil pump at an early stage even during the air bleed process. Can do.

1 Mechanical oil pump 1a Suction pipe 1b Mesh (filter)
2 Electric oil pump 2a Suction tube 2b First suction tube 2c Second suction tube 3 Control device OP Oil pan

Claims (3)

A mechanical oil pump driven by an engine;
The suction pipe for the mechanical oil pump sucks oil from the oil pan, said a position lower than the oil surface of the oil pan, and lower than the oil level of the oil pan at a predetermined low oil temperature state An electric oil pump having a suction pipe communicating with a position higher than the oil level in the suction pipe;
A control device for controlling the electric oil pump so as to suck out the air in the suction pipe,
The controller is
An oil pump system for a vehicle that performs an air bleeding process in the suction pipe by operating the electric oil pump when an oil temperature falls below a predetermined temperature. A mechanical oil pump driven by an engine;
An electric oil pump having a suction pipe communicating with a portion below the oil level of the oil pan of a suction pipe for the mechanical oil pump to suck up oil from the oil pan;
A control device for controlling the electric oil pump so as to suck out the air in the suction pipe,
The controller is
An oil pump system for a vehicle that performs an air venting process in the suction pipe by operating the electric oil pump when an increase in hydraulic pressure on the discharge side of the mechanical oil pump is not detected. A mechanical oil pump driven by an engine;
A first suction pipe communicating with a suction pipe for sucking oil from the oil pan by the mechanical oil pump at a site below the oil level of the oil pan; and a site above the oil level of the oil pan An electric oil pump having a second suction pipe communicating with
An air vent that raises the oil level in the suction pipe to the position of the second suction pipe by controlling the electric oil pump so that the air in the suction pipe is sucked out by the first and second suction pipes. A control device that performs processing;
An oil pump system for vehicles composed of.

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