Vehicle control device, vehicle control method and program

Abstract

The present invention can suppress the suction noise of an oil pump, thereby preventing the driver from feeling uncomfortable. A vehicle control device includes: a first oil pump driven by a first drive source that drives the vehicle's drive wheels and supplies oil to a hydraulic working machine; and a second oil pump driven by a second drive source different from the first drive source and supplies oil to the hydraulic working machine. The second oil pump is driven when the vehicle's starting switch is turned on and the first drive source is initially started, and is driven when the second oil pump remains undriven for a first predetermined time after the first drive source is started. The rotational speed of the second oil pump when the first drive source is started is lower than the rotational speed of the second oil pump after the first drive source is started.

Description

Technical Field

[0001] The present invention relates to a vehicle control device, a vehicle control method, and a program. Background Art

[0002] Patent Document 1 discloses a control device for a vehicle automatic transmission. When the ignition switch is turned off, an electric oil pump supplies oil pressure to a first brake of the automatic transmission to engage the first brake, thereby discharging air mixed in the oil passage of the first brake.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2010-117032

[0006] Problems to be solved by the invention

[0007] However, in the control device of Patent Document 1, even if exhaust is performed after the ignition switch is turned off, if the time is left open until the next ignition switch is turned on, air may be mixed into the oil passage, causing a decrease in responsiveness.

[0008] The present inventors have also recognized that when the ignition switch (starter switch) of a vehicle is turned on and the electric oil pump first starts operating, if air is mixed into the oil passage, a suction sound may be generated, causing discomfort to the driver. Summary of the Invention

[0009] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to suppress the suction noise of the oil pump so as not to cause discomfort to the driver.

[0010] According to one embodiment of the present invention, a control device for a vehicle is provided, wherein the vehicle comprises: a first oil pump, which is driven by a first drive source that drives a drive wheel of the vehicle and supplies oil to a hydraulic working machine; a second oil pump, which is driven by a second drive source different from the first drive source and supplies oil to the hydraulic working machine, wherein the control device of the vehicle performs the following processing: driving the second oil pump when the vehicle start switch is turned on and the first drive source is initially started, and driving the second oil pump when the second oil pump is not driven for a first specified time after the first drive source is started, and the rotation speed of the second oil pump when the first drive source is started is lower than the rotation speed of the second oil pump after the first drive source is started.

[0011] Effects of the Invention

[0012] In the above embodiment, the second oil pump is driven when the vehicle's start switch is turned on and the first drive source is initially started, thereby discharging air from the oil circuit. Furthermore, since the rotational speed of the second oil pump during startup of the first drive source is lower than the rotational speed of the second oil pump after startup, suction noise can be reduced. Consequently, suction noise from the second oil pump can be suppressed, preventing discomfort to the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic configuration diagram of a vehicle to which the control device according to the embodiment of the present invention is applied.

[0014] Figure 2 This is a flowchart of the exhaust process of the second oil pump when the start switch of the vehicle is turned on and the first drive source is started for the first time.

[0015] Figure 3 This is a flowchart of the exhaust process of the second oil pump after the first drive source is started.

[0016] Figure 4 This is a timing chart illustrating a first specific example of the exhaust process of the second oil pump.

[0017] Figure 5 This is a timing chart illustrating a second specific example of the exhaust process of the second oil pump. DETAILED DESCRIPTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0019] First, refer to Figure 1 A vehicle 100 to which the control device of the present embodiment is applied will be described. Figure 1 It is a schematic structural diagram of the vehicle 100 .

[0020] like Figure 1 As shown, vehicle 100 includes engine ENG, transmission TM as a hydraulically operated hydraulic machine, and controller 2 as a control device. Transmission TM is a belt-type continuously variable transmission having a torque converter TC, a forward / reverse switching mechanism SWM, and a speed change mechanism VA.

[0021] Engine ENG constitutes the primary drive source for driving wheels DW of vehicle 100. Engine ENG is, for example, a gasoline engine or a diesel engine. Power from engine ENG is transmitted to drive wheels DW via a torque converter TC, a forward / reverse switching mechanism SWM, and a speed change mechanism VA. In other words, the torque converter TC, the forward / reverse switching mechanism SWM, and the speed change mechanism VA are provided on a power transmission path connecting engine ENG and drive wheels DW.

[0022] The torque converter TC transmits power using fluid. By engaging the lockup clutch LU in the torque converter TC, power transmission efficiency can be improved.

[0023] The forward / reverse switching mechanism SWM is provided on the power transmission path connecting the engine ENG and the speed change mechanism VA. The forward / reverse switching mechanism SWM switches the vehicle 100 between forward and reverse directions by switching the direction of input rotation. The forward / reverse switching mechanism SWM includes a forward clutch FWD / C, which engages when the forward gear is selected, and a reverse brake REV / B, which engages when the reverse gear is selected. When the forward clutch FWD / C and the reverse brake REV / B are released, the transmission TM enters a neutral state, or a power-off state.

[0024] The speed change mechanism VA constitutes a belt-type continuously variable transmission mechanism having a primary pulley PRI, a secondary pulley SEC, and a belt BLT wound around the primary pulley PRI and the secondary pulley SEC. The oil pressure of the primary pulley PRI, i.e., the primary pulley pressure, is supplied to the primary pulley PRI via a hydraulic control circuit 1 (described later). The oil pressure of the secondary pulley SEC, i.e., the secondary pulley pressure, is supplied to the secondary pulley SEC via a hydraulic control circuit 1 (described later).

[0025] The transmission TM is further configured to include a mechanical oil pump MP as a first oil pump, an electric oil pump EP as a second oil pump, and an electric motor M as a second drive source different from the first drive source.

[0026] Mechanical oil pump MP is driven by engine ENG. It draws hydraulic oil from reservoir (oil pan) 40 via filter 31 and oil passage 32, and pumps (supplies) the oil to transmission TM via hydraulic control circuit 1. A check valve 25 is provided in the flow path connecting mechanical oil pump MP and hydraulic control circuit 1.

[0027] The electric oil pump EP is driven by the power of the electric motor M. The electric oil pump EP is driven together with the mechanical oil pump MP or alone, sucks out the working oil from the reservoir 40 through the filter 33 and the oil circuit 34, and pressurizes (supplies) the oil to the transmission TM through the oil pressure control circuit 1. A check valve 26 is provided in the flow path connecting the electric oil pump EP and the oil pressure control circuit 1. The electric oil pump EP is provided in an auxiliary manner relative to the mechanical oil pump MP. That is, when the supply of oil from the mechanical oil pump MP to the transmission TM stops or is insufficient, the electric oil pump EP temporarily supplies oil to the transmission TM based on a drive request to supplement the insufficient oil. The electric oil pump EP can also be understood as being composed of the electric motor M.

[0028] The transmission TM further includes a hydraulic control circuit 1. The hydraulic control circuit 1 comprises a plurality of flow paths and a plurality of hydraulic control valves, and regulates the pressure of oil supplied from the mechanical oil pump MP or the electric oil pump EP before supplying the oil to various parts of the transmission TM.

[0029] The hydraulic control circuit 1 performs hydraulic control of the lockup clutch LU, the forward clutch FWD / C, the reverse brake REV / B, the primary pulley PRI, the secondary pulley SEC, and the like based on a command from the controller 2 .

[0030] The controller 2 is comprised of a microcomputer equipped with a central processing unit (CPU), read-only memory (ROM), random access memory (RAM), and an input / output interface (I / O interface). The CPU reads and executes programs stored in the ROM to perform various processes. The controller 2 may also be comprised of multiple microcomputers. Specifically, the controller 2 may include an automatic transmission control unit (ATCU) that controls the transmission TM, an automatic transmission control unit (SCU) that controls gear shifting, and an automatic control unit (ECU) that controls the engine ENG.

[0031] The controller 2 controls the oil pressure of the engine ENG, the oil pressure control circuit 1, and the electric motor M that drives the electric oil pump EP based on signals from the ignition switch 27, various sensors 28 that detect the status of various parts of the vehicle 100 (specifically, including an accelerator opening sensor, a speed sensor, a vehicle speed sensor, and an oil pressure sensor), and the circuit breaker 29a that detects the position of the shift selector 29.

[0032] However, in vehicle 100, mechanical oil pump MP and electric oil pump EP are not operated when ignition switch 27 is off. Therefore, when vehicle 100 is parked for a long time in a parking lot at home, oil may leak from the oil passage in transmission TM.

[0033] When vehicle 100 is traveling, engine ENG is activated, driving mechanical oil pump MP to fill various components with oil. However, as described above, since check valve 26 is provided between electric oil pump EP and hydraulic control circuit 1, the oil circuit on the electric oil pump EP side relative to check valve 26 is not filled with oil. Therefore, if there is a request to drive electric oil pump EP, there is a possibility that the supply of oil from electric oil pump EP to hydraulic control circuit 1 will be delayed.

[0034] Furthermore, even while the vehicle 100 is traveling, if the electric oil pump EP continues to be not driven, oil leaks from the oil passage on the electric oil pump EP side relative to the check valve 26 .

[0035] Furthermore, the present inventors have recognized that when the ignition switch 27 of the vehicle 100 is turned on and the electric oil pump EP first starts operating, if air is mixed into the oil passage, a suction sound may be generated, causing discomfort to the driver.

[0036] Therefore, when the ignition switch 27 of the vehicle 100 is turned on, the engine ENG is initially started, and the electric oil pump EP is not driven for a first specified time (specified time Tb) after the engine ENG is started, the controller 2 drives the electric oil pump EP as described below and performs exhaust processing to fill oil into the oil circuit closer to the electric oil pump EP side than the check valve 26 (the oil circuit on the upstream side of the check valve 26).

[0037] Furthermore, when engine ENG is restarted after executing an idling stop, driving is often started immediately after engine ENG is started. Therefore, when engine ENG is restarted after executing an idling stop, the exhaust gas treatment of electric oil pump EP is not performed, as is the case when ignition switch 27 is turned on and engine ENG is initially started. That is, in this embodiment, "engine ENG startup" refers to the initial startup of engine ENG after vehicle 100's ignition switch 27 is turned on, and restarting engine ENG after executing an idling stop is not included in "engine ENG startup."

[0038] Next, refer to Figure 2 The operation control of the electric oil pump EP initially performed when the ignition switch 27 is turned on will be described.

[0039] Figure 2 This is a flowchart of the exhaust process of the electric oil pump EP when the ignition switch 27 is turned on and the engine ENG is started for the first time. The exhaust process of the electric oil pump EP in this embodiment is executed based on a program pre-stored in the controller 2. Figure 2 The process starts when the shift selector 29 of the vehicle 100 is in the P position.

[0040] In step S11, controller 2 determines whether ignition switch 27 has been turned on from off based on the output signal from ignition switch 27. If it is determined in step S11 that ignition switch 27 has been turned on, the process proceeds to step S12. When ignition switch 27 is turned on, engine ENG starts, and mechanical oil pump MP begins discharging oil. On the other hand, if it is determined in step S11 that ignition switch 27 has not been turned on, that is, remains off, the process of step S11 is repeated.

[0041] In step S12, controller 2 determines whether the operating conditions for operating electric oil pump EP are met. These operating conditions include at least the following: when engine ENG is started and mechanical oil pump MP begins discharging oil, the discharge pressure reaches a stable state after the rate of increase in discharge pressure temporarily increases. If, in step S12, the operating conditions for electric oil pump EP are determined to be met, the process proceeds to step S13. On the other hand, if, in step S12, the operating conditions for electric oil pump EP are determined not to be met, the process repeats step S12.

[0042] In step S13, controller 2 operates electric oil pump EP at a low speed S1, which is lower than normal speed Sn. As described later, normal speed Sn is the speed of electric oil pump EP after engine ENG is started. In contrast, low speed S1 is lower than normal speed Sn. Here, normal speed Sn is, for example, approximately 1500 to 2000 rpm, while low speed S1 is, for example, approximately 500 to 1000 rpm.

[0043] Furthermore, when the vehicle 100 is suddenly braked or a sudden downshift is executed, a large speed change (downshift) is performed from the current gear ratio to a lower gear ratio (a larger gear ratio). Thus, when the vehicle 100 is suddenly braked or a sudden downshift is executed, a faster speed is required, and the required oil flow rate increases. Therefore, the rotational speed of the electric oil pump EP during sudden braking of the vehicle 100 is approximately 2000 to 3000 rpm higher than the normal rotational speed Sn. The rotational speed of the electric oil pump EP during a sudden downshift is also approximately 2000 to 3000 rpm higher than the normal rotational speed Sn.

[0044] In step S14, the controller 2 determines whether the shift selector 29 has switched from the P gear to the driving gear. The P gear refers to the parking gear in which the parking lock mechanism (not shown) locks the transmission TM. The driving gear includes the D gear (forward gear) and the R gear (reverse gear), which are gears in which the transmission TM can transmit power from the engine ENG to drive the drive wheels DW. In step S14, if it is determined that the shift selector 29 has not switched from the P gear to the driving gear, the controller 2 transfers to step S16. The controller 2 determines that the shift selector 29 has not switched from the P gear to the driving gear not only when the shift selector 29 has not switched in the P gear state, but also when the D gear or the R gear remains unchanged without switching. On the other hand, when it is determined in step S14 that the shift selector 29 has switched from the P gear to the driving gear, the controller transfers to step S15.

[0045] In step S15, the controller 2 switches the shift selector 29 to engage the forward clutch FWD / C or reverse brake REV / B of the forward / reverse switching mechanism SWM, supplying oil. This stops the operation of the electric oil pump EP and interrupts the exhaust process. At this point, the shift selector 29 switches from the P range to the Drive range, halting the operation of the electric oil pump EP. Therefore, the exhaust process of the electric oil pump EP is not completed. Therefore, the process returns to step S12 to again determine whether the operating conditions of the electric oil pump EP are met. If the operating conditions of the electric oil pump EP are met, the exhaust process of the electric oil pump EP is resumed.

[0046] In addition, the operating conditions for re-executing the exhaust treatment of the electric oil pump EP include: the shift selector 29 is switched and the selection treatment is completed; the oil temperature of the transmission TM is within the threshold; no failure of the electric oil pump EP is detected; and the electric oil pump EP has not become inoperable from the perspective of protecting it.

[0047] In step S16, controller 2 determines whether the electric oil pump EP has been driven for a predetermined time Ta. The predetermined time Ta is the time during which the electric oil pump EP is operated at a low speed S1 to perform exhaust gas treatment. The predetermined time Ta is set to the time it takes for the electric oil pump EP to reach a predetermined number of revolutions Np. The predetermined number of revolutions Np is the number of revolutions required to fill the oil passages on the electric oil pump EP side relative to the check valve 26 with oil. Specifically, the predetermined number of revolutions Np is preset so that the hydraulic oil fills the space above the oil level in the filter 33, which draws hydraulic oil from the oil passage 34 upstream of the electric oil pump EP and the reservoir 40. Here, the predetermined number of revolutions Np is approximately 30 to 35 revolutions. The predetermined time Ta is longer than the predetermined time Tc used to perform exhaust gas treatment by the electric oil pump EP at a normal speed Sn after engine ENG is started, as described later. Here, the predetermined time Ta is approximately 2.0 to 3.0 seconds, and the predetermined time Tc is approximately 1.0 seconds. If it is determined in step S16 that the driving time of the electric oil pump EP has reached the predetermined time Ta, the process proceeds to step S17. On the other hand, if it is determined in step S16 that the driving time of the electric oil pump EP has not reached the predetermined time Ta, the process returns to step S13 and the exhaust process of the electric oil pump EP is continued.

[0048] Thus, the driving time of the electric oil pump EP during engine ENG startup (predetermined time Ta) is longer than the driving time of the electric oil pump EP after engine ENG startup (predetermined time Tc). Consequently, even if the rotational speed of the electric oil pump EP during startup decreases, a decrease in the amount of exhausted air can be suppressed, thereby suppressing a decrease in the responsiveness of the transmission TM during driving caused by the influence of air.

[0049] In step S17, the controller 2 stops the operation of the electric oil pump EP, thereby completing the exhaust process of the electric oil pump EP.

[0050] In this manner, when the ignition switch 27 of the vehicle 100 is turned on and the engine ENG is initially started, the electric oil pump EP is driven, thereby discharging air from the oil circuit. Furthermore, since the rotational speed of the electric oil pump EP during engine ENG startup is lower than that after engine ENG startup, suction noise can be reduced. Consequently, suction noise from the electric oil pump EP can be suppressed, preventing discomfort to the driver.

[0051] Next, refer to Figure 3 Exhaust processing of the electric oil pump EP after starting engine ENG will be described.

[0052] Figure 3 This is a flowchart of the exhaust process of the electric oil pump EP after the engine ENG is started. Figure 3 The process is Figure 2 The process then starts continuously.

[0053] In step S21, controller 2 determines whether the electric oil pump EP has not been driven for a predetermined time Tb, which is a first predetermined time, after engine ENG is started. The predetermined time Tb is set to the time during which the electric oil pump EP remains undriven, potentially allowing oil to leak from the oil passage on the electric oil pump EP side of the check valve 26. Here, the predetermined time Tb is approximately 40 to 50 minutes. If, in step S21, it is determined that the electric oil pump EP has not been driven for the predetermined time Tb after engine ENG is started, the process proceeds to step S22. On the other hand, if, in step S21, it is determined that the electric oil pump EP has not been driven for the predetermined time Tb after engine ENG is started, the process of step S21 is repeated.

[0054] In step S22 , the controller 2 operates the electric oil pump EP at a normal rotation speed Sn.

[0055] In step S23, controller 2 determines whether the driving time of the electric oil pump EP from the time it begins operating at the normal speed Sn has continued for a predetermined time Tc, which serves as a second predetermined time. The predetermined time Tc is set to the time it takes for the electric oil pump EP to reach a predetermined number of rotations Np. The predetermined number of rotations Np is the number of rotations required to fill the oil passage on the electric oil pump EP side relative to the check valve 26 with oil. Specifically, the predetermined number of rotations Np is preset so that the hydraulic oil fills the space above the oil level in the filter 33, which draws hydraulic oil from the oil passage 34 upstream of the electric oil pump EP and the reservoir 40. Here, the predetermined number of rotations Np is approximately 30 to 35 rotations. If, in step S23, it is determined that the driving time of the electric oil pump EP has continued for the predetermined time Tc, the process proceeds to step S24. On the other hand, if, in step S23, it is determined that the driving time of the electric oil pump EP has not continued for the predetermined time Tc, the determination in step S23 is repeated.

[0056] In step S24, the controller 2 stops the operation of the electric oil pump EP, thereby completing the exhaust process of the electric oil pump EP.

[0057] In this manner, after engine ENG is started, the electric oil pump EP is driven for a predetermined time Tc at predetermined time intervals Tb. Therefore, even if air enters the intake flow path of the electric oil pump EP during driving, the electric oil pump EP can be activated and discharged by driving the electric motor M. Consequently, even when oil pressure is supplied from the electric oil pump EP as required by the driving state, the effects of air intrusion can be suppressed, thereby suppressing a decrease in the responsiveness of the transmission TM during driving due to the effects of air.

[0058] Next, refer to Figure 4 A first specific example of the exhaust process of the electric oil pump EP performed by the controller 2 will be described. Figure 4 1 is a timing chart illustrating a first specific example of the exhaust process of the electric oil pump EP.

[0059] At time T11, the ignition switch 27 is switched from OFF to ON. At this time, since the operating conditions for operating the electric oil pump EP are not met, the controller 2 does not start the operation of the electric oil pump EP.

[0060] At time T12 , since the operating conditions for operating the electric oil pump EP are met, the controller 2 operates the electric oil pump EP at a low rotation speed S1 that is lower than the normal rotation speed Sn.

[0061] At time T13, the electric oil pump EP has been in operation for a predetermined time Ta since it was started at time T12, so the controller 2 stops the operation of the electric oil pump EP. This completes the exhaust process of the electric oil pump EP at the initial start of the engine ENG when the ignition switch 27 is turned on.

[0062] At time T14 , the electric oil pump EP has not been driven for a predetermined time Tb after the engine ENG is started, so the controller 2 operates the electric oil pump EP at the normal rotation speed Sn.

[0063] At time T15, the electric oil pump EP has been in operation for a predetermined time Tc since it started operating at time T14, so the controller 2 stops the electric oil pump EP. This completes the exhaust process for the electric oil pump EP when the electric oil pump EP has not been in operation for a predetermined time Tb after engine ENG was started.

[0064] Next, refer to Figure 5 A second specific example of the exhaust process of the electric oil pump EP performed by the controller 2 will be described. Figure 5 The second specific example differs from the first specific example in that the exhaust process of the electric oil pump EP is not completed when the ignition switch 27 is turned on and the engine ENG is first started, but is executed again.

[0065] At time T21, the ignition switch 27 is switched from OFF to ON. At this time, since the operating conditions for operating the electric oil pump EP are not met, the controller 2 does not start the operation of the electric oil pump EP.

[0066] At time T22 , since the operating conditions for operating the electric oil pump EP are met, the controller 2 operates the electric oil pump EP at a low rotation speed S1 that is lower than the normal rotation speed Sn.

[0067] At time T23, the shift selector 29 is switched from the P range to the driving range D. Therefore, although the driving time of the electric oil pump EP has not reached the predetermined time Ta, the controller 2 stops the electric oil pump EP and stops the exhaust process.

[0068] At time T24 , the operating conditions for operating the electric oil pump EP are met again, so the controller 2 operates the electric oil pump EP at a low rotation speed S1 that is lower than the normal rotation speed Sn.

[0069] At time T25, the electric oil pump EP has been driven for a predetermined time Ta since it was started at time T24, so the controller 2 stops the electric oil pump EP. This completes the exhaust process of the electric oil pump EP at the initial start of the engine ENG when the ignition switch 27 is turned on.

[0070] In this manner, when the exhaust process of the electric oil pump EP is interrupted and not completed when the ignition switch 27 is turned on and the engine ENG is first started, the exhaust process is repeatedly executed until the exhaust process of the electric oil pump EP driven at the low rotation speed S1 is normally completed.

[0071] At time T26 , the electric oil pump EP has not been driven for a predetermined time Tb after the engine ENG is started, so the controller 2 operates the electric oil pump EP at the normal rotation speed Sn.

[0072] At time T27, the electric oil pump EP has been in operation for a predetermined time Tc since it started operating at time T26, so the controller 2 stops the electric oil pump EP. This completes the exhaust process for the electric oil pump EP when the electric oil pump EP has not been in operation for a predetermined time Tb after engine ENG was started.

[0073] The structure and effects of the above-mentioned embodiment will be summarized and described.

[0074] (1)(5)(6) In a vehicle 100 having a mechanical oil pump MP driven by an engine ENG that drives a driving wheel DW of the vehicle 100 and supplies oil to a transmission TM, and an electric oil pump EP driven by an electric motor M different from the engine ENG and supplies oil to the transmission TM, the controller 2 drives the electric oil pump EP when the ignition switch 27 of the vehicle 100 is turned on and the engine ENG is initially started, and drives the electric oil pump EP when the electric oil pump EP is not driven for a first predetermined time after the engine ENG is started, and the rotation speed of the electric oil pump EP when the engine ENG is started (low rotation speed S1) is lower than the rotation speed of the electric oil pump EP after the engine ENG is started (normal rotation speed Sn).

[0075] With this configuration, the electric oil pump EP is driven when the ignition switch 27 of the vehicle 100 is turned on and the engine ENG is initially started, thereby discharging air from the oil circuit. Furthermore, since the rotational speed of the electric oil pump EP during engine ENG startup (low rotational speed S1) is lower than the rotational speed of the electric oil pump EP after engine ENG startup (normal rotational speed Sn), suction noise can be reduced. Consequently, suction noise from the electric oil pump EP can be suppressed, preventing discomfort to the driver.

[0076] (2) Furthermore, after the engine ENG is started, the controller 2 drives the electric oil pump EP for a predetermined time Tc at every predetermined time Tb.

[0077] According to this configuration, after engine ENG is started, the electric oil pump EP is driven for a predetermined time Tc at predetermined time intervals Tb. Therefore, even if air enters the intake flow path of the electric oil pump EP during driving, the electric oil pump EP can be activated and discharged by driving the electric motor M. Thus, even when oil pressure from the electric oil pump EP is required depending on the driving state, the effects of air intrusion can be suppressed, thereby preventing a decrease in the responsiveness of the transmission TM during driving due to the effects of air.

[0078] (3) Furthermore, the driving time (predetermined time Ta) of the electric oil pump EP when the engine ENG is started is longer than the driving time (predetermined time Tc) of the electric oil pump EP while the vehicle 100 is traveling.

[0079] With this configuration, the driving time of the electric oil pump EP during engine ENG startup (predetermined time Ta) is longer than the driving time of the electric oil pump EP after engine ENG startup (predetermined time Tc). This prevents a decrease in the amount of air discharged even when the rotational speed of the electric oil pump EP decreases during startup. Consequently, a decrease in the responsiveness of the transmission TM during driving due to the influence of air can be suppressed.

[0080] (4) Furthermore, the rotation speed of the electric oil pump EP when the engine ENG is started (low rotation speed S1) is lower than the minimum rotation speed of the electric oil pump EP after the engine ENG is started.

[0081] According to this configuration, the rotation speed of the electric oil pump EP when starting engine ENG (low rotation speed S1) is lower than the minimum rotation speed of the electric oil pump EP after engine ENG is started, thereby reducing the suction noise. Therefore, the suction noise of the electric oil pump EP can be suppressed, and the driver will not feel uncomfortable.

[0082] While the embodiment of the present invention has been described above, the above embodiment merely shows one application example of the present invention, and the technical scope of the present invention is not limited to the specific configuration of the above embodiment.

[0083] For example, in the above embodiment, a check valve 26 is provided on the discharge side of the electric oil pump EP. Alternatively, a check valve may be provided on the reservoir side of the electric oil pump EP. In this case, oil may leak from the oil passage between the check valve and the reservoir, potentially delaying the supply of oil from the electric oil pump EP to the hydraulic control circuit 1. Therefore, in this case, the controller 2 also performs an exhaust process.

[0084] As various programs executed by the controller 2 , for example, programs stored in a non-transitory recording medium such as a CD-ROM can be used.

[0085] Explanation of symbols

[0086] 100 vehicles

[0087] 2. Controller (control device, computer)

[0088] 27 Ignition switch (starter switch)

[0089] ENG engine (primary drive source)

[0090] M motor (second drive source)

[0091] MP mechanical oil pump (first oil pump)

[0092] EP electric oil pump (second oil pump)

[0093] TM transmission (hydraulic working machinery)

Claims

1. A control device for a vehicle, the vehicle comprising: a first oil pump driven by a first drive source for driving a drive wheel of the vehicle and supplying oil to a hydraulic working machine; and a second oil pump driven by a second drive source different from the first drive source and supplying oil to the hydraulic working machine, wherein: The vehicle control device performs the following processing: The second oil pump is driven when the vehicle start switch is turned on and the first drive source is initially started, and the second oil pump is driven when the second oil pump is not driven for a first predetermined time after the first drive source is started. The rotation speed of the second oil pump when the first drive source is started is lower than the rotation speed of the second oil pump after the first drive source is started.

2. The vehicle control device according to claim 1, wherein: After the first drive source is started, the second oil pump is driven for a second predetermined time every first predetermined time.

3. The vehicle control device according to claim 1, wherein: A driving time of the second oil pump when the first driving source is started is longer than a driving time of the second oil pump after the first driving source is started.

4. The vehicle control device according to claim 1, wherein: The rotation speed of the second oil pump when the first drive source is started is lower than the lowest rotation speed of the second oil pump after the first drive source is started.

5. The vehicle control device according to any one of claims 1 to 4, wherein: The first driving source is an engine, The second driving source is an electric motor, The hydraulically operated machine is a hydraulically operated transmission.

6. A method for controlling a vehicle, the vehicle comprising: a first oil pump driven by a first drive source for driving a drive wheel of the vehicle and supplying oil to a hydraulic working machine; and a second oil pump driven by a second drive source different from the first drive source and supplying oil to the hydraulic working machine, wherein: The vehicle control method performs the following processing: The second oil pump is driven when the vehicle start switch is turned on and the first drive source is initially started, and the second oil pump is driven when the second oil pump is not driven for a first predetermined time after the first drive source is started. The rotation speed of the second oil pump when the first drive source is started is lower than the rotation speed of the second oil pump after the first drive source is started.

7. A storage medium storing a program executable by a computer of a vehicle, the vehicle comprising: a first oil pump driven by a first drive source driving a drive wheel of the vehicle and supplying oil to a hydraulic working machine; and a second oil pump driven by a second drive source different from the first drive source and supplying oil to the hydraulic working machine, wherein: The program causes the computer to execute the following processing: The second oil pump is driven when the vehicle start switch is turned on and the first drive source is initially started, and the second oil pump is driven when the second oil pump is not driven for a first predetermined time after the first drive source is started. The rotation speed of the second oil pump when the first drive source is started is lower than the rotation speed of the second oil pump after the first drive source is started.

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