JP2003065102A - Controller for power plant for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fuel consumption by increasing operation opportunity of an electric oil pump and prolonging an execution period of economical run control of a vehicle. SOLUTION: A controller for a power plant 1 shifting power generated in a power source, outputting it, and controlled by an oil pressure for the vehicle provided with the oil pump 7 driven by an electric motor 8 generating an oil pressure when the power source stops in the power plant is provided with a setting means for setting cooling time for cooling the electric motor 8 based on an oil temperature upon completion of the operation of the oil pump 7 (steps S2, S3) and an inhibition means for inhibiting the operation of the electric motor 8 from the time when the operation of the oil pump 7 ends until the cooling time elapses (steps S4 to S7).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power plant for shifting and outputting power generated by a power source such as an internal combustion engine, and more particularly to a power plant for vehicles equipped with an electric oil pump for generating hydraulic pressure. The present invention relates to the control device.

[0002]

2. Description of the Related Art As a technique for improving the fuel consumption of a vehicle and reducing the amount of exhaust gas, so-called eco-run control for stopping a drive source for traveling when the vehicle is temporarily stopped is known. This eco-run control is when the vehicle speed is zero,
When it is determined that the vehicle does not start immediately from the driving situation up to that point and the driver's driving operation, the engine that is the drive source is automatically stopped, and then the operation for starting is detected. , Control for automatically starting the engine. Therefore, the frequency of stopping the engine after changing it to the idling state increases, so that the fuel consumption amount and the exhaust gas amount can be reduced.

However, since the engine is the power source of the vehicle as a whole, the power of the vehicle is lost when the engine is stopped. Therefore, for example, when the transmission connected to the output side of the engine is a hydraulically controlled transmission,
Since the hydraulic pump in the transmission stops as the engine stops, the hydraulic pressure for controlling the transmission is also lost. Therefore, in the past, in order to establish the eco-run control, an electric oil pump was attached to the transmission in addition to the hydraulic pump driven by the engine, and this electric oil pump was driven when the engine was stopped to secure the hydraulic pressure of the transmission. It is configured to do.

An example thereof is described in Japanese Patent Laid-Open No. 2001-41067. The invention described in this publication is configured to generate hydraulic pressure by an electric oil pump when the engine is stopped by temporarily stopping the vehicle. Also, with this configuration, the electric oil pump is activated and the hydraulic pressure is held in advance to maintain the transmission in an operable state before the eco-run control is started and the engine is stopped, and the vehicle is swiftly operated. I am ready to start.

[0005]

The electric oil pump described above is configured to generate hydraulic pressure by driving the pump with an electric motor. Like an ordinary motor, this electric motor unavoidably generates heat due to its operation, and has a temperature range within which the rated output can be performed. Further, the electric oil pump is an auxiliary oil pump that does not operate steadily as compared with the hydraulic pump of the transmission, and therefore, an electric motor having a limited electric motor capacity is used.

However, when the operation of the electric oil pump is repeated, the operating heat may cause the electric motor itself to reach a high temperature exceeding the rated temperature range, which may cause the electric motor to fail. Therefore, by stopping the operation of the electric motor every time the operation of the electric motor is completed,
The electric motor which has risen in temperature is cooled to keep the electric motor operable.

However, since the cooling time for stopping the electric motor is set fixedly, the electric oil pump cannot be operated immediately after the end of the operation, which becomes a limiting factor and the eco-run control is continuously performed. There was a situation where it could not be carried out.

For example, when a vehicle that is stopped in a low temperature environment and the vehicle body is in a low temperature state is started, and immediately after that, the vehicle is repeatedly started and stopped, and the conditions for eco-run control continue to be satisfied, the electric motor is sufficiently cooled. Although the electric oil pump cannot operate during the cooling time, the engine cannot be restarted, the engine start timing is delayed, or the eco-run control is canceled. Execution will not be sustainable.

As described above, conventionally, there is no recognition of the problem that the electric oil pump for establishing the eco-run control is a limiting factor of the eco-run control, and naturally, the technical matters for solving the problem are not known. It was

On the other hand, when the cooling time for stopping the electric motor is not set, the restriction of the eco-run control by the electric oil pump is avoided. However, if the eco-run control is continuously performed, the electric oil pump is repeatedly operated, and thus it is not possible to sufficiently protect the electric motor against high temperature.

The present invention has been made by paying attention to the above technical problems, and a variable power plant capable of increasing the operating opportunity of an electric oil pump by making the cooling time of the electric motor in the electric oil pump variable. An object is to provide a control device.

[0012]

In order to achieve the above-mentioned object, the invention of claim 1 provides a power plant which outputs power generated by a power source while shifting the speed and which is controlled by hydraulic pressure. In a control device for a vehicle power plant provided with an oil pump driven by an electric motor that generates the oil pressure when the power source is stopped, when the oil pump stops operating, the Based on the above, there are provided setting means for setting a cooling time for cooling the electric motor, and prohibiting means for prohibiting the operation of the electric motor from the time when the operation of the oil pump ends until the cooling time elapses. It is a control device characterized in that

According to the invention of claim 1, the cooling time for stopping and cooling the electric motor is set according to the oil temperature when the operation of the electric motor is completed.
When the oil temperature is low, the cooling time of the electric motor is shortened, so it is possible to increase the number of operating opportunities for the electric oil pump that uses the electric motor as a drive source, and to cool the electric motor sufficiently for each operation Will be done.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the cooling time is corrected based on the temperature of the electric motor when the oil pump stops operating or a physical quantity related to the motor temperature. The control device is characterized by the above.

According to the invention of claim 2, in addition to the function of claim 1, the electric motor at that time has a cooling time set according to the oil temperature when the operation of the electric motor is completed. Since the temperature or the physical quantity related to the motor temperature is used for the correction, it is possible to make a correction according to the temperature difference between the oil temperature and the motor temperature, and the motor temperature status is reflected in the cooling time to improve the cooling time setting accuracy. It can be improved.

According to a third aspect of the present invention, in addition to the configuration of the second aspect, the physical quantity is one of an electric power consumption amount of the electric motor, a continuous operation time of the electric motor, and an estimated value estimated from a motor operation history. It is a control device characterized in that there is.

According to the invention of claim 3, in addition to the operation of claim 2, since these physical quantities can be obtained from the command signals of the sensors and motor control circuits conventionally provided in the power plant, the number of parts is reduced. Does not increase, and the overall configuration of the device can be simplified.

Therefore, in the present invention, the cooling time for stopping and cooling the electric motor is appropriately set according to the oil temperature when the operation of the oil pump is completed. Therefore, the non-operation time of the oil pump operated by the electric motor is minimized, so that the opportunity to execute the eco-run control using the electric oil pump is increased and the fuel efficiency of the vehicle can be improved.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described based on specific examples. FIG. 2 shows a power plant 1 according to the present invention.
Is schematically shown, and the example shown here is a so-called horizontal type adopted in a front engine / front drive (FF) vehicle or the like. That is,
An engine (internal combustion engine) 2 as a power source is arranged with its axis oriented in the width direction of the vehicle, and a transmission 3 is connected to the output side thereof.

The engine 2 is typically a gasoline engine or a diesel engine, and may constitute a power source by itself, or as a power source together with other power devices such as an electric motor as in a hybrid vehicle. It may be configured. In addition, the engine 2 inevitably generates heat by operating, and therefore a cooling fluid such as cooling water is circulated between the radiator and a radiator (not shown) to force the heat into the atmosphere. It is configured to dissipate and cool.

On the other hand, the transmission 3 is provided with a fluid type transmission device such as a torque converter 4 and a belt type or toroidal type variator 5 capable of continuously changing the gear ratio. Is connected to the output side of the engine 2 via. Further, the torque converter 4 is provided with lock-up clutches (not shown) that are engaged so as to directly transmit torque between the pump impeller on the input side and the turbine runner on the output side. Engagement of hydraulic pressure and lockup clutch (including slip state engagement) for transmitting torque between the engine and turbine runner
And for controlling the release, the hydraulic pressure is appropriately supplied.

The variator 5 sets an operating pressure for setting the torque capacity via a transmission member such as a belt in accordance with the driving state of the vehicle, and for setting the clamping pressure or tension of the transmission member such as a belt. In order to ensure and as well as to perform a gear shift, the hydraulic pressure is appropriately supplied and discharged.

In order to retain oil for driving or controlling the torque converter 4 and the variator 5,
An oil pan 6 is provided below the transmission 3. An oil pump (not shown) that pumps up and pressurizes the oil is incorporated between the torque converter 4 and the variator 5. The oil pump is connected to a pump impeller, which is a member on the input side of the torque converter 4, for example, and is driven by the power of the engine 2 to generate hydraulic pressure. An oil temperature sensor (not shown) that measures the temperature of the oil is provided at an appropriate position on the flow path through which the oil is fed.

An electric oil pump 7 is attached to a position corresponding to the oil pump on the side surface of the transmission 3 (side surface on the front side in a vehicle mounted state).

This electric oil pump 7 includes an electric motor 8
The electric motor 8 and the pump 9 are housed in a casing having a substantially integrated structure. Also, this pump 9
A predetermined hydraulic circuit (not shown) communicates with the oil pump in the transmission 3 in parallel. Therefore, the electric oil pump 7 supplies hydraulic pressure in place of the oil pump in the transmission 3 when the engine 2 is stopped. Also, this electric oil pump 7
Is the belt type or toroidal type variator 5
At the time of starting the vehicle in which the engine 2 is started, the hydraulic pressure is also generated in order to compensate for the lack of the capacity of the oil pump due to the small initial power of the engine 2.

It should be noted that the electric motor 8 has a characteristic that the internal resistance becomes small and a current easily flows in a low temperature state of a predetermined temperature or less, as in a normal motor.

Further, an engine electronic control unit (not shown) for controlling the engine and a sensor signal from an oil temperature sensor or the like are input to the transmission 4 and the electric oil pump 7.
The electronic control unit for the transmission (not shown) that controls the engine, the electronic control unit for the eco-run (not shown) that controls the rotation and stop of the engine based on predetermined conditions, and these control devices are integrated. The power plant 1 is provided with an electronic control unit (not shown) having an integrated control unit (not shown) for controlling. These integrated control device, electronic control device for engine, electronic control device for transmission, and electronic control device for eco-run are all central processing units (CPU or MPU) and storage devices (RAM, ROM) and input / output devices. Each is composed of a microcomputer mainly including an output interface. The general control device, the engine electronic control device, the transmission electronic control device, and the eco-run electronic control device exchange signals with each other to exchange data and share data. Furthermore, with this integrated control device,
A configuration for controlling the operation of the electric oil pump 7 of the present invention is realized.

A specific example of controlling the operation of the electric oil pump 7 in the above-mentioned structure will be described with reference to the flowchart shown in FIG.

Before the control of this example, predetermined conditions such as temporary stop of the vehicle are satisfied, so-called eco-run control is activated, the engine 2 is temporarily stopped, and the engine 2 is temporarily stopped. In order to start 2 and start the vehicle,
It is assumed that the electric oil pump 7 has started to operate.

That is, in step S1, the operation of the electric oil pump 7 is terminated assuming that the engine 2 has been started and is in the operating state, and in the next step S2,
The oil temperature sensor measures the oil temperature at the end of the operation of the electric oil pump 7. Then, in step S3, the cooling time for stopping the operation of the electric motor 8 of the electric oil pump 7 is acquired from the measured oil temperature with reference to the correlation map shown in FIG.

In this correlation map, the characteristic that the temperature of the electric motor 8 decreases tends to depend on the oil temperature. Therefore, the cooling time is set to be variable beforehand according to the level of the oil temperature. It is configured.

That is, as described above, the electric oil pump 7 is provided to assist the hydraulic pump of the transmission 3 and does not always operate. Therefore, the electric oil pump 7 has a simpler structure than the hydraulic pump, and the electric motor 8 is also compared. A simple and compact one is used. For this reason, the small electric motor 8 has a small heat capacity, so that it is easy to warm and cool.

On the other hand, the oil pumped by these pumps is less affected by the operating heat of the electric motor 8. That is, this oil has a sufficient amount in order to stably provide the transmission 3 with lubrication, cooling, and operating pressure, and therefore, even if it is affected by the operating heat of the transmission 3, The influence of the operating heat of the electric motor 8 itself is not so much affected.

Therefore, although depending on the pump volume of the electric oil pump 7, the temperature of the oil retained inside the pump is about the same as the ambient temperature of the electric motor 8, so that the electric oil pump 7 is provided with the electric oil. For the temperature of the motor 8 itself,
It has a big influence.

As a result, by stopping the electric motor 8 after the operation of the electric motor 8, the temperature of the electric motor 8 which has once risen due to the operation of the electric motor 8 naturally decreases, but is affected by the oil temperature. The time until the temperature of the electric motor 8 drops to a predetermined temperature varies. This is because if the oil temperature is relatively high, this time will be long, while if the oil temperature is relatively low,
It will be shorter.

Further, particularly when the temperature of the oil is sufficiently low due to a situation such as the initial stage of starting when the vehicle does not warm up during cold weather, most of the operating heat of the electric motor 8 warms the oil. Therefore, the temperature of the electric motor 8 hardly rises, and the cooling of the electric motor 8, that is, the cooling time is unnecessary.

Therefore, the time for cooling the electric motor 8 by stopping the operation of the electric motor 8 obtained from the correlation map includes the setting of zero time, and the temperature of the electric motor 8 affected by the oil temperature is It is set to be the minimum time necessary and sufficient to reduce to an operable temperature within its operating range.

In step S4, the set cooling time of the electric motor 8 is determined based on the oil temperature, and the counting operation of the timer is started.

In step S5, the operation of the electric oil pump 7 is prohibited, and in step S6, it is determined whether the set cooling time has elapsed. That is, it is determined whether or not the count value by the timer exceeds the cooling time. If it exceeds, the process proceeds to step S6 and thereafter, and if it does not exceed the cooling time,
Returning to step S5, the operation of the electric oil pump 7 continues to be prohibited. Therefore, the electric oil pump 7 is stopped and the electric motor 8 is cooled by the cooling time until the cooling time determined in step S4 elapses.

Then, in step S6 after the cooling time has passed.
Then, the prohibition of operation of the electric oil pump 7 is released, the electric oil pump 7 can be operated, the counting operation of the timer is ended, and then the present control is returned.

Therefore, in the above configuration, the electric motor 8 is based on the oil temperature at the end of the operation of the electric motor 8.
Since the electric motor 8 is cooled by setting the minimum cooling time required for the electric motor 8, it is possible to increase the chances of operating the electric oil pump 7 by the electric motor 8 and the so-called eco-run control by the electric oil pump 7. Can be relaxed.

That is, for example, immediately after the vehicle has started in a low temperature state, the vehicle is temporarily stopped and started by a stop signal or the like, and the engine 2 is temporarily stopped by so-called eco-run control. Even when it is desired to repeat the operation, the cooling time of the electric oil pump 7 is set to be short or set to zero time, so that the engine 2 can be temporarily stopped by the eco-run control continuously without any restriction.

In other words, if the oil temperature is the electric motor 8
When the temperature is sufficiently lower than the operating temperature range, the oil is positively used as a cooling medium for the electric motor 8 to enhance the cooling efficiency of the electric motor 8 and increase the chances of operating the electric oil pump 7. I am trying to do it. That is, even when the electric motor 8 is kept at a low temperature and can be immediately operated, the electric oil pump 7 cannot be immediately operated if the cooling time is set to a fixed fixed time. However, in such a case, when the oil temperature is low, the cooling time is shortened or set to zero time, so that the electric motor 8 can be immediately operated, and the eco-run control by the electric oil pump 7 is restricted. You can avoid or suppress receiving.

Further, as described above, the electric oil pump 7
Since the electric motor 8 has a low internal resistance in a low temperature state, an overcurrent is likely to occur, and the coil wire or the like forming the electric motor 8 may be damaged. However, according to this configuration,
When the oil temperature is low depending on the low temperature state, the cooling time can be set to be short or zero time.
It is possible to avoid overcooling of the electric motor 8, prevent overcurrent from occurring, and protect the electric motor 8.

Furthermore, since the electric motor 8 is cooled to the necessary and minimum at the end of each operation, the electric motor 8
Of the electric oil 8 is prevented, and when the operation of the electric motor 8 is started, the electric motor 8 is started to operate within the operating temperature range, the rated motor output can be secured, and the pump performance of the electric oil pump 7 is stable. In addition, the motor efficiency can be improved, and the amount of electric power consumed by the electric motor 8 can be reduced.

Therefore, stable operation of the electric oil pump 7 can be ensured even in a high temperature environment.
The heat resistance of the electric oil pump 7 and the operation reliability at high temperatures can be improved.

Further, even when the electric oil pump 7 is operated for a long time, the electric motor 8 is sufficiently cooled even after the operation is completed, even if it is a necessary minimum. Since the electric motor 8 is always kept within the operating temperature range, the same long-time operation can be repeated and the reliability of the electric oil pump 7 for long-term operation can be improved.

Further, in addition to the above structure, the electric oil pump 7
When the operation of the electric motor 8 is finished, in addition to measuring the oil temperature of the transmission 3, the temperature of the electric motor 8 is measured and the cooling time is corrected by the motor temperature. The accuracy of setting the cooling time can be improved, and the cooling time can be further shortened.

In the case of this configuration, a temperature sensor may be provided in the electric motor 8 or the electric oil pump 7 to directly measure the motor temperature, but a physical quantity related to the motor temperature is measured. Then, the temperature of the electric motor 8 may be indirectly estimated.

That is, by recording the time point at which a command signal for controlling the operation of the electric motor 8 is transmitted and the time elapsed from the operation start command to the stop command, the motor power consumption,
Since the amount of heat generated by the electric motor 8 can be calculated by acquiring the motor continuous operation time and the like, the temperature of the electric motor 8 at the time when the motor operation is completed can be estimated from the amount of heat generated during the motor operation.

The motor temperature can also be estimated from the operation history of the electric motor 8 composed of the oil temperature, the engine cooling water temperature, the motor continuous operation time, and the like.

That is, at least when the engine cooling water temperature is low, it can be considered that the engine cooling water temperature is low because the engine 2 is in a low temperature or room temperature and is in an initial state. Therefore, the motor temperature of the electric motor 8 is also low. Alternatively, it can be determined that the temperature is normal temperature.

Also in the case of this configuration, the data necessary for the control of this configuration may be acquired from the sensor conventionally provided in the power plant 1. That is, the engine cooling water temperature can be acquired from the cooling water temperature sensor, and the motor power consumption amount and the motor continuous operation time can be acquired from the command signal from the transmission electronic control unit to the electric motor 8.

Therefore, this control configuration is realized only by changing the internal processing program in each electronic control device that receives a signal from the sensor and the integrated control device that cooperatively controls these electronic control devices. Therefore, the number of parts does not increase, the overall configuration of the device is simplified, and further cost reduction and reduction in size and weight can be achieved.

By correcting the cooling time set from the oil temperature by the motor temperature thus obtained, the cooling time of the electric motor 8 can be further shortened according to the temperature state of the electric motor 8. Can be set.

That is, for example, when the motor temperature and the oil temperature are substantially the same, the cooling time set based on the oil temperature is left unchanged. Then, when the motor temperature is high and the oil temperature is low, the set cooling time is corrected so as to be lengthened by a predetermined amount. Also,
When the motor temperature is low and the oil temperature is high, the cooling time is corrected so as to be shortened to a predetermined value or corrected to zero time and set. Furthermore, the rate of correcting the cooling time is increased according to the magnitude of the temperature difference between the oil temperature and the motor temperature.

Therefore, according to this structure, when the operation of the electric oil pump 7 is finished, the oil temperature of the transmission 3 and the temperature of the electric motor 8 are measured, and the cooling time is set from the oil temperature. Since the set cooling time is corrected according to the temperature state of the electric motor 8 to be cooled, the motor temperature state is reflected in the cooling time, so that the setting accuracy of the cooling time can be improved and the motor temperature can be improved. When the temperature is lower than the oil temperature, the cooling time of the electric motor 8 can be shortened, and the restriction of the eco-run control by the electric oil pump 7 can be further relaxed.

In this configuration, the cooling time is set first, and then the set cooling time is corrected, but the corrected cooling time is set based on the oil temperature and the motor temperature. The prepared cooling map may be prepared in advance, and the corrected cooling time may be acquired only by referring to this map.

Further, if the eco-run control is permitted as soon as the temperature of the electric motor 8 drops to a predetermined temperature and the electric oil pump 7 becomes operable, the execution of the eco-run control will not be delayed and fuel economy will be improved. Since the improvement is effective, it is preferable to output the eco-run control permission signal based on the output signal of the motor temperature sensor. Therefore, in this case, it is possible to further improve the fuel consumption and reduce the exhaust gas amount by performing the eco-run control.

Further, similarly, when the temperature of the electric motor 8 when the operation of the electric motor 8 is finished is a low temperature within the operating temperature range, the cooling time of the electric motor 8 is irrespective of the oil temperature. May be set to a short time or zero time, and an eco-run control permission signal may be output to prompt execution of eco-run control without restricting the operation of the electric oil pump 7.

The present invention is not limited to the above specific examples. Therefore, the power plant of the present invention is not limited to the horizontal type described above, but may be a so-called vertical type in which the axis is arranged in the front-rear direction of the vehicle. Therefore, in that case, the transmission to which the electric oil pump is attached may not be configured as the transaxle but may be configured as the transmission alone.

The power plant 1 corresponds to the power plant of the present invention, the engine 2 corresponds to the power source of the present invention, the electric oil pump 7 corresponds to the electric oil pump of the present invention, and the electric motor corresponds to the electric power of the present invention. The functional means of steps S2 and S3 correspond to the motor 8, the setting means of the present invention corresponds, and the functional means of steps S4 to S7 correspond to the prohibiting means of the present invention.

In the above specific example, the continuously variable transmission is used as the transmission. However, the transmission constituting the power plant of the present invention includes a stepped transmission, an automatic transmission, and a manual transmission. It can be any of the machines.

[0064]

As described above, according to the present invention, the cooling time for stopping and cooling the electric motor is set according to the oil temperature when the operation of the electric motor ends. When the oil temperature is low, the cooling time of the electric motor is shortened, so it is possible to increase the chances of operating the oil pump that uses the electric motor as a drive source, and alleviate the restrictions on eco-run control by the oil pump.
Since the electric motor is sufficiently cooled for each motor operation, it is possible to protect the electric motor and improve the operating performance of the oil pump.

In particular, in the invention of claim 2, the cooling time set according to the oil temperature when the operation of the electric motor is finished is determined by the temperature of the electric motor at that time or a physical quantity related to the motor temperature. Because it is corrected,
The motor temperature state 1 is reflected in the cooling time, the setting accuracy of the cooling time can be improved, the restriction of the eco-run control can be further relaxed, and the fuel consumption can be improved.

Further, in the invention of claim 3, the data necessary for control can be acquired and the control can be realized by using the existing detecting means, so that the electric motor of the oil pump can be realized without complicating the structure of the power plant. It is possible to grasp the temperature condition of the motor when the operation is completed, and it is possible to reduce the cost and reduce the size and weight.

Therefore, since the electric motor of the electric oil pump is cooled by providing the stop time according to the temperature of the oil supplied by the electric oil pump, the cooling time during which the electric motor is inoperative is shortened. As a result, the chances of driving the oil pump are increased, the feasibility of eco-run control is increased, and the fuel efficiency of the vehicle can be improved.

[Brief description of drawings]

FIG. 1 is a flowchart showing a control example by a control device of the present invention.

FIG. 2 is a front view showing a device configuration relating to the control device of the present invention.

FIG. 3 is a correlation map showing the relationship between the oil temperature and the cooling time used in the control example of the present invention.

[Explanation of symbols]

1 ... power plant, 2 ... engine, 3 ... transmission,
7 ... Electric oil pump, 8 ... Electric motor, 9 ... Pump.

Continued front page    (72) Inventor Toshiya Yamashita             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. (72) Inventor Shuji Toyokawa             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. F term (reference) 3D037 CA04 CA07 CA08 CB07 CB36                 3G092 AC03 DG08 FA30 GB10 HF03X                 3G093 AA01 BA19 BA21 BA22 EB05                       EC02                 5H570 AA21 BB09 CC02 HB02 HB12                       LL20 MM05

Claims (3)

[Claims] 1. An oil pump driven by an electric motor for generating a hydraulic pressure when the power source is stopped, in a power plant that shifts and outputs the power generated by a power source and is controlled by the hydraulic pressure. In a control device for a vehicle power plant, which is installed side by side, when the oil pump finishes operating, setting means for setting a cooling time for cooling the electric motor based on oil temperature, and the operation of the oil pump A control device for a power plant for a vehicle, comprising: a prohibition unit that prohibits the operation of the electric motor from the time when the cooling is completed until the cooling time elapses. 2. The method according to claim 1, wherein the cooling time is corrected based on a temperature of the electric motor when the oil pump stops operating or a physical quantity related to the motor temperature. Control device for vehicle power plant. 3. The vehicle according to claim 2, wherein the physical quantity is one of an electric power consumption of an electric motor, a continuous operation time of the electric motor, and an estimated value estimated from a history of operation of the electric motor. Power plant control equipment.