阅读说明：本技术 电力供给控制装置 (Power supply control device ) 是由 原田雅道 于 2020-09-11 设计创作，主要内容包括：本发明提供一种电力供给控制装置,其在电动油泵成为高温的情况下,可适当地保护驱动器的电路基板,并且缩短使电路基板从保护状态至恢复成通常的运行状态为止的时间。本发明包括：驱动器,具有电路基板,控制电动油泵的工作；控制单元,控制对于驱动器的电力供给；基板温度传感器,检测电路基板的温度；以及油温传感器,将变速机的工作油的温度作为油温来检测；控制单元在基板温度传感器检测到的电路基板的温度超过了规定的第一阈值温度的情况下,执行禁止对于驱动器的电力供给的通电禁止控制,在所述通电禁止控制的执行过程中,根据油温传感器检测到的油温,执行判定是否解除通电禁止控制的解除判定。(The invention provides a power supply control device, which can properly protect a circuit substrate of a driver and shorten the time from a protection state to the return of the circuit substrate to a normal operation state under the condition that an electric oil pump is heated. The invention comprises the following steps: a driver having a circuit board and controlling the operation of the electric oil pump; a control unit that controls power supply to the driver; a substrate temperature sensor for detecting the temperature of the circuit substrate; and an oil temperature sensor that detects a temperature of the hydraulic oil of the transmission as an oil temperature; the control unit executes energization prohibition control for prohibiting power supply to the actuator when the temperature of the circuit board detected by the board temperature sensor exceeds a predetermined first threshold temperature, and executes cancellation determination for determining whether or not to cancel the energization prohibition control, based on the oil temperature detected by the oil temperature sensor, during execution of the energization prohibition control.)

1. An electric power supply control device for controlling supply of electric power to an electric oil pump in a vehicle having a hydraulic drive force transmission mechanism for transmitting a drive force to a drive wheel and the electric oil pump for supplying a hydraulic pressure to the drive force transmission mechanism, the electric power supply control device comprising:

an electric oil pump control unit having a circuit board and controlling operation of the electric oil pump;

a power supply control unit that controls power supply to the electric oil pump control unit;

a first temperature detection unit that detects a temperature of the circuit board; and

a second temperature detection means provided in the driving force transmission mechanism and detecting a temperature of the hydraulic oil in the driving force transmission mechanism as an oil temperature;

the electric power supply control unit executes energization prohibition control for prohibiting the supply of electric power to the electric oil pump control unit when the temperature of the circuit board detected by the first temperature detection means exceeds a predetermined first threshold temperature, and executes cancellation determination for determining whether or not to cancel the energization prohibition control based on the oil temperature detected by the second temperature detection means during execution of the energization prohibition control.

2. The electric power supply control device according to claim 1,

further comprising a storage unit that stores, as energization prohibition control information, whether or not the energization prohibition control is executed in a state where the supply of electric power to the electric oil pump control unit is stopped,

the electric power supply control unit determines whether or not to execute the energization prohibition control based on the energization prohibition control information when the electric power supply to the electric oil pump control unit is stopped and then the electric power supply is restarted.

3. The electric power supply control device according to claim 1,

the electric power supply control unit cancels the energization prohibition control when the oil temperature is lower than a predetermined second threshold temperature lower than the first threshold temperature and an integrated value of a difference obtained by subtracting the oil temperature from the second threshold temperature exceeds a predetermined value in the cancellation determination.

4. The electric power supply control device according to claim 3,

the electric power supply control unit cancels the energization prohibition control regardless of the integrated value when the oil temperature is lower than a predetermined third threshold temperature lower than the second threshold temperature in the cancellation determination.

5. The electric power supply control device according to any one of claims 1 to 4,

a hydraulic pressure supply device for supplying hydraulic pressure to the driving force transmission mechanism,

the oil pressure supply device includes the electric oil pump and another oil pump provided upstream of the electric oil pump,

the electric oil pump further pressurizes the oil pressure supplied from the other oil pump and supplies the pressurized oil pressure to the driving force transmission mechanism.

Technical Field

The present invention relates to an electric power supply control device that controls supply of electric power to an electric oil pump that supplies hydraulic pressure to a driving force transmission mechanism.

Background

In recent years, a so-called electromechanical integrated electric oil pump has been used, in which an electric oil pump for supplying hydraulic pressure to a hydraulic drive force transmission mechanism such as a transmission of a vehicle is integrally incorporated with an electronic control unit including a semiconductor element and the like for controlling an operation state thereof, and optimization of operation, abnormality detection, and the like are performed by an in-vehicle Area Network (LAN) using a communication protocol such as a Controller Area Network (CAN).

For example, patent document 1 discloses the following technique: an electric oil pump provided with a circuit board having a Central Processing Unit (CPU) includes a comparison Unit for comparing substrate temperature information relating to the temperature of the circuit board obtained from a substrate temperature sensor with comparison temperature information relating to the temperature change of the circuit board obtained from another sensor, and detects an abnormality of the substrate temperature sensor by monitoring whether or not the substrate temperature information obtained from the substrate temperature sensor normally changes.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open No. 2014-234854

Disclosure of Invention

[ problems to be solved by the invention ]

In such an electromechanical integrated electric oil pump, the circuit board is continuously exposed to high-temperature working oil (working oil), and thus there is a problem that the board temperature easily reaches a high temperature exceeding the heat resistance limit of the CPU. In order to solve the above problem, there is an option of using a CPU having high heat resistance, but another problem of increasing the cost is caused by using a CPU of a special specification. To solve such a problem, the following measures have been taken: for example, a self-protection control is incorporated to automatically shut down the CPU when the substrate temperature exceeds a predetermined temperature, thereby preventing the CPU from operating in a high-temperature environment of a temperature higher than or equal to the heatproof temperature and preventing a failure or damage.

Here, it is known that when a general CPU compares an energized state with a non-energized state, the heat resistant temperature in the non-energized state increases. When the self-protection control as described above is used, the operation of the CPU is stopped at a time point when the predetermined temperature is exceeded, but the power supply to the CPU itself is maintained, and therefore, if the temperature further rises from the time point and approaches the heat resistance limit temperature of the power supply state, or exceeds the heat resistance limit temperature, the CPU may malfunction or break. Since there is a case where a failure or breakage of the CPU makes self-detection or detection by the host controller impossible, the CPU is usually stopped at an early stage by setting the predetermined temperature at which the CPU stops operating to be much lower than the heat-resistant limit temperature in the power-on state and thereby increasing the temperature. Thus, the temperature of the CPU can be prevented from reaching the heat-resistant limit temperature of the energized state, but the following problems arise as a drawback: the time during which the electric oil pump cannot be controlled increases, and thus fuel consumption deteriorates when the electric oil pump is used for idle stop (idle stop).

In addition, in the case of a system in which the CPU is automatically turned off at a high temperature by using substrate temperature information obtained from a substrate temperature sensor provided in a circuit substrate of the electric oil pump as in patent document 1, the substrate temperature information is not obtained any more in association with the turning-off of the CPU, and therefore, a subsequent change in the substrate temperature cannot be detected or estimated with high accuracy, and it is not possible to confirm that the temperature of the CPU has sufficiently decreased, and therefore, it is necessary to set a standby time until the CPU is operated again to be long.

Further, in the case of automatic shutdown of the CPU by the self-protection control, the hydraulic pressure supplied from the electric oil pump is abruptly decreased in association therewith, and thus there is a possibility that the driving force transmission mechanism is damaged.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power supply control device that can appropriately protect a circuit board of a driver that controls an operation of an electric oil pump without incurring a cost for improving heat resistance performance when the electric oil pump is at a high temperature, and can shorten a time required for the circuit board to return from a protected state to a normal operation state.

[ means for solving problems ]

In order to achieve the above object, the invention according to claim 1 of the present invention is an electric power supply control device for controlling supply of electric power to an electric oil pump 3 in a vehicle including a hydraulic drive force transmission mechanism (in the embodiment (hereinafter, the same applies to the present description)) for transmitting a drive force to a drive wheel and the electric oil pump 3 for supplying a hydraulic pressure to the drive force transmission mechanism, the electric power supply control device including: an electric oil pump control unit (actuator 4) having a circuit board and controlling the operation of the electric oil pump; a power supply control unit (control unit 2) that controls power supply to the electric oil pump control unit; a first temperature detection means (substrate temperature sensor 5) for detecting the temperature TCPU of the circuit substrate; and a second temperature detection means (oil temperature sensor 7) provided in the driving force transmission mechanism and detecting the temperature of the working oil in the driving force transmission mechanism as an oil temperature TOIL; the electric power supply control unit executes energization prohibition control (fig. 2) for prohibiting the supply of electric power to the electric oil pump control unit when the temperature TCPU of the circuit board detected by the first temperature detection means exceeds a predetermined first threshold temperature TTHR1, and executes cancellation determination (fig. 3) for determining whether or not to cancel the energization prohibition control based on the oil temperature TOIL detected by the second temperature detection means during execution of the energization prohibition control.

According to the power supply control device, the power supply control unit executes the energization prohibition control for prohibiting the power supply to the electric oil pump control unit when the temperature of the circuit board detected by the first temperature detection means exceeds a predetermined first threshold temperature. Accordingly, the operation of the electric oil pump control unit is stopped in the non-energized state in which the heat resistance is higher than that in the energized state, and thus it is possible to effectively prevent the electric oil pump control unit from being broken or damaged due to high temperature without incurring a cost for improving the heat resistance.

Further, since the energization prohibition control is executed by the power supply control unit, unlike the automatic shutdown of the CPU by the conventional self-protection control, the rapid decrease in the hydraulic pressure can be prevented, and therefore the driving force transmission mechanism can be prevented from being damaged by the rapid change in the load.

Further, since the cancellation determination of determining whether or not to cancel the energization prohibition control is executed by the power supply control unit based on the oil temperature in the driving force transmission mechanism having a high correlation with the substrate temperature during execution of the energization prohibition control, the time until cancellation of the energization prohibition control can be shortened.

The invention according to claim 2 of the present invention is the power supply control device according to claim 1, further comprising a storage unit 8, wherein the storage unit 8 stores whether or not the energization prohibition control is executed as the energization prohibition control information (energization prohibition flag F _ POFF) in a state where the power supply to the electric oil pump control unit is stopped, and the power supply control unit determines whether or not the energization prohibition control is executed based on the energization prohibition control information when the power supply to the electric oil pump control unit is restarted after the power supply to the electric oil pump control unit is stopped (fig. 6).

According to the above configuration, whether or not the energization prohibition control is executed in a state where the power supply to the power supply control unit is stopped is stored as the energization prohibition control information. Thus, even when a temporary power loss occurs to the power supply control unit due to, for example, an instantaneous power failure when the energization prohibition control is executed, the energization prohibition control can be executed again by referring to the energization prohibition control information after recovery from the power loss, and the electric oil pump control unit in a high-temperature state can be appropriately protected.

In the invention according to claim 3 of the present invention, in the electric power supply control device according to claim 1, the electric power supply control unit releases the energization prohibition control when the oil temperature TOIL is lower than a predetermined second threshold temperature TTHR2 lower than the first threshold temperature TTHR1 and an integrated value Σ Δ T of a difference Δ T obtained by subtracting the oil temperature TOIL from the second threshold temperature TTHR2 exceeds a predetermined value TREF in the release determination (steps 11, 15, 16, 13, and 4 of fig. 3)

As described above, in the determination of cancellation of the energization prohibition control, it is determined whether or not the energization prohibition control can be cancelled, that is, whether or not the temperature of the circuit board of the electric oil pump control unit has sufficiently decreased, based on the oil temperature in the driving force transmission mechanism having a high correlation with the board temperature. Here, since there is a certain degree of deviation between the actual substrate temperature and the oil temperature, when the cancellation determination of the energization prohibition control is simply performed according to whether or not the oil temperature is lower than the predetermined temperature, the predetermined temperature used for the determination must be set to a lower temperature in order to ensure a temperature difference that may occur between the substrate temperature and the oil temperature as a safety margin. Therefore, the time required for the cancellation of the energization prohibition control also becomes longer.

In order to solve such a problem, in the present configuration, in the determination of cancellation of the energization prohibition control, an integrated value of the oil temperature lower than a predetermined second threshold temperature lower than the first threshold temperature and a difference obtained by subtracting the oil temperature from the second threshold temperature exceeds a predetermined value is set as a condition for cancellation of the energization prohibition control. That is, not only the oil temperature being lower than the second threshold temperature is taken as the condition for release, but also the value of the oil temperature and the elapsed time are taken into the release determination. With this configuration, the second threshold temperature can be set without taking into account the temperature difference that may occur between the substrate temperature and the oil temperature as a limit, and the time required for releasing the energization prohibition control can be reduced.

In the invention according to claim 4 of the present invention, in the electric power supply control device according to claim 3, the electric power supply control unit cancels the energization prohibition control regardless of the integrated value when the oil temperature TOIL is lower than a predetermined third threshold temperature TTHR3 lower than the second threshold temperature TTHR2 in the cancellation determination (steps 12 and 13 in fig. 3).

According to this configuration, when the detected oil temperature is lower than the third threshold temperature that is set lower than the second threshold temperature, the energization prohibition control is immediately canceled without using the integrated value under the estimation that the substrate temperature having a high correlation with the oil temperature has also decreased sufficiently. This can further shorten the time required for releasing the energization prohibition control.

The invention of claim 5 provides the electric power supply control device according to any one of claims 1 to 4, wherein a hydraulic pressure supply device 21 that supplies hydraulic pressure to the drive force transmission mechanism is provided, the hydraulic pressure supply device 21 includes the electric oil pump 3 and another oil pump Pb provided upstream of the electric oil pump 3, and the electric oil pump 3 further pressurizes the hydraulic pressure supplied from the other oil pump and supplies the pressurized hydraulic pressure to the drive force transmission mechanism.

According to the above configuration, the electric oil pump is connected in series with the other oil pump, and the electric oil pump further pressurizes the oil pressure supplied from the other oil pump and supplies the pressurized oil pressure to the driving force transmission mechanism. In such a configuration, compared to a case where the electric oil pump and another oil pump are connected in parallel and used for different purposes, the frequency of use of the motor that drives the electric oil pump is increased, and the frequency of passing high-temperature hydraulic oil through the electric oil pump is also increased. Therefore, the temperature inside the electric oil pump is likely to be high, and therefore the temperature of the circuit board provided in the electric oil pump is also likely to be high, but even in this case, by executing the energization prohibition control for the electric oil pump control unit by the electric power supply control unit, it is possible to effectively prevent damage or failure of the electric oil pump control unit.

Drawings

Fig. 1 is a configuration diagram of a power supply control device according to an embodiment of the present invention.

Fig. 2 is a flowchart showing a control process for inhibiting energization to a circuit board of a driver of an electric oil pump.

Fig. 3 is a flowchart showing a process of determining cancellation of the energization prohibition control.

Fig. 4 is a flowchart showing a process of the CPU cooling determination.

Fig. 5 is a diagram for explaining the relationship between the oil temperature and the elapsed time in the CPU cooling determination.

Fig. 6 is a flowchart showing a control process at the time of startup of the control unit.

Fig. 7 is a diagram showing an outline of a hydraulic pressure supply device according to an embodiment of the present invention.

[ description of symbols ]

1: power supply control device

2: control unit (Power supply control part)

3: electric oil pump

4: driver (electric oil pump control part)

5: substrate temperature sensor (first temperature detecting component)

6: variable speed machine (Driving force transmission mechanism)

7: oil temperature sensor (second temperature detecting component)

8: storage unit

9: temperature acquisition unit (Power supply control unit)

10: temperature determination unit (Power supply control unit)

11: cooling determination unit (Power supply control unit)

21: hydraulic pressure supply device

TCPU: substrate temperature (temperature of circuit substrate)

TOIL: oil temperature

TTHR 1: first threshold temperature

TTHR 2: second threshold temperature

TTHR 3: third threshold temperature

F _ POFF: power-on disable flag (Power-on disable control information)

Δ T: TTHR 2-TOIL (difference obtained by subtracting oil temperature from second threshold temperature)

Σ Δ T: cumulative value

TREF: specified value

F _ COL: CPU cooling flag

Pb: another oil pump

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a configuration diagram of a power supply control device according to an embodiment of the present invention. The electric power supply control device 1 is applied to a vehicle (not shown) equipped with a transmission 6 and an electric oil pump 3 that supplies hydraulic pressure to the transmission 6, and controls supply of electric power for driving the electric oil pump 3.

The electric oil pump 3 is driven by a motor 12 supplied with electric power from a battery (not shown) or the like, and pressurizes oil (hydraulic oil) drawn up from a tank 13 and supplies the oil to the transmission 6. The motor 12 is driven by the control of the driver 4. The driver 4 includes a circuit board (neither is shown) having a CPU, and controls driving of the motor 12 in accordance with a control signal supplied from the control unit 2. That is, the driver 4 controls the operation of the electric oil pump 3 by controlling the driving of the motor 12. The driver 4 is provided with a substrate temperature sensor 5 that detects the temperature of the circuit substrate constituting the driver 4, and the driver 4 sequentially transmits the temperature TCPU of the circuit substrate of the driver 4 detected by the substrate temperature sensor 5 to the control unit 2. The substrate temperature sensor 5 may be incorporated in the driver 4 or may be disposed externally, as long as it can detect the temperature TCPU of the circuit substrate of the driver 4.

The transmission 6 includes, for example, a belt-type and hydraulic continuously variable transmission mechanism having a driven pulley (drive pulley) and a driving pulley (drive pulley), not shown. The transmission 6 is provided with an oil temperature sensor 7 that detects the temperature of the oil supplied from the electric oil pump 3 as an oil temperature TOIL. The oil temperature sensor 7 sequentially transmits the detected oil temperature TOIL to the control unit 2.

The control unit 2 includes a microcomputer including a CPU, a Random Access Memory (RAM), a Read Only Memory (ROM), an Input/Output (I/O) interface (none of which is shown), and the like. The control unit 2 reads and executes the program stored in the storage unit 8, thereby realizing the functions of the temperature acquisition unit 9, the temperature determination unit 10, and the cooling determination unit 11. The control unit 2 acquires the substrate temperature TCPU detected by the substrate temperature sensor 5 and the oil temperature TCPU detected by the oil temperature sensor 7, executes energization prohibition control processing described later, and switches on/off of a relay (not shown) provided in a wiring that supplies electric power to the actuator 4 according to the result of the execution of the energization prohibition control processing, thereby switching between energization and non-energization of the actuator 4.

In the present embodiment, the storage unit 8 of the control unit 2 includes a nonvolatile memory. The storage unit 8 stores whether or not the energization prohibition control is being executed immediately before the control unit 2 is stopped (energization is ended). As will be described later, the control unit 2 refers to the storage unit 8 at the time of its startup (at the time of energization start) to determine whether or not to execute energization prohibition control. In the present embodiment, the storage unit 8 is included in the control unit 2, but the storage unit 8 may be configured as a part of a higher-level control unit or as an independent component as long as the control unit 2 can be referred to at the time of activation.

The operation of the power supply control device 1 of the present embodiment configured as described above will be described with reference to fig. 2 to 6. The power supply control device 1 of the present embodiment executes energization prohibition control for prohibiting energization to the actuator 4 when the circuit board of the actuator 4 is in a high temperature state exceeding a predetermined temperature, and executes determination as to whether or not to cancel the energization prohibition control based on the oil temperature TOIL that is the temperature of the hydraulic oil in the electric oil pump 3 having a high correlation with the board temperature TCPU during execution of the energization prohibition control.

Fig. 2 is a flowchart showing a control process for inhibiting energization to the drive 4. After the start-up control of the control unit 2 described later is executed, the present process is repeatedly executed, for example, at a predetermined cycle until the energization of the control unit 2 is turned off. First, in step 1 (shown as "S1". the same applies hereinafter), it is determined whether or not the energization disable flag F _ POFF is "1". The energization prohibition flag F _ POFF is set to "1" when energization prohibition control that prohibits energization of the drive 4 is being performed, and is set to "0" when energization prohibition control is not being performed. The value of the energization disable flag F _ POFF is stored in the storage unit 8 of the control unit 2 and is not lost even when energization to the control unit 2 is turned off. If the determination result in step 1 is NO (NO) and the energization prohibition control process is not in progress, the routine proceeds to next step 2.

In step 2, the temperature determination unit 10 of the control unit 2 determines whether or not the current substrate temperature TCPU acquired by the temperature acquisition unit 9 from the driver 4 is higher than a predetermined first threshold temperature TTHR 1. The first threshold temperature TTHR1 is set to a temperature lower than the heatproof limit temperature in the energized state of the CPU included in the circuit substrate of the driver 4. When the self-protection control for automatically shutting down the CPU when the CPU reaches the predetermined temperature is incorporated into the drive 4, the first threshold temperature TTHR1 is set to a temperature lower than the predetermined temperature at which the CPU is automatically shut down. If the determination result in step 2 is negative, that is, if the substrate temperature TCPU is equal to or lower than the first threshold temperature TTHR1, the present process is ended. When the determination result of step 2 is YES, that is, when the substrate temperature TCPU is higher than the first threshold temperature TTHR1, the process proceeds to the next step 3.

In step 3, a relay (an Oil Pressure (EOP) relay) provided in a wiring line for supplying electric power to the driver 4 is turned off by an instruction of the control unit 2, and thereby, energization to the driver 4 is prohibited and the operation of the electric Oil pump 3 is stopped. Thus, the driver 4 is in a non-energized state, and the heat resistant temperature of the CPU is higher than that in an energized state, whereby it is possible to effectively prevent a failure or damage of the CPU exposed to a high temperature. Further, unlike the automatic shutdown by the self-protection control of the CPU in the related art, since the energization prohibition control is performed under the control of the control unit 2 as the higher-level control unit, it is possible to prevent a sudden drop in the hydraulic pressure due to a sudden stop of the CPU and to prevent the transmission 6 from being damaged.

Finally, in step 4, the value of the power-on disable flag F _ POFF is set to "1", and the present process is ended.

On the other hand, when the result of the determination in step 1 is yes, that is, when the energization prohibition control is being executed, a determination (release determination) is made as to whether or not the energization prohibition control is to be released (step 5), which will be described later, and then the present process is ended.

Fig. 3 shows a subroutine of the cancellation determination process of the energization prohibition control. In the present process, first, in step 11, the temperature determination unit 10 of the control unit 2 determines whether or not the current oil temperature TOIL acquired by the temperature acquisition unit 9 from the oil temperature sensor 7 is lower than the second threshold temperature TTHR 2. In addition, the second threshold temperature TTHR2 is set to a lower temperature than the first threshold temperature TTHR 1. If the determination result in step 11 is negative, that is, if the oil temperature TOIL is equal to or higher than the second threshold temperature TTHR2, the present process is terminated as it is (that is, the energization prohibition control is not canceled). On the other hand, when the determination result in step 11 is yes, that is, when the oil temperature TOIL is lower than the second threshold temperature TTHR2, the routine proceeds to next step 12.

In step 12, the temperature determination unit 10 of the control unit 2 determines whether or not the current oil temperature TOIL acquired by the temperature acquisition unit 9 from the oil temperature sensor 7 is lower than the third threshold temperature TTHR 3. In addition, the third threshold temperature TTHR3 is set to a temperature lower than the second threshold temperature TTHR2, desirably to a temperature as follows: if oil temperature TOIL is equal to or lower than this temperature, substrate temperature TCPU relating to oil temperature TOIL is always much lower than the heat resistance limit temperature at the time of energization. When the determination result in step 12 is yes, that is, when the oil temperature TOIL is lower than the third threshold temperature TTHR3, the routine proceeds to next step 13.

In step 13, a relay provided in a wiring that supplies power to the driver 4 is switched from off to on by an instruction of the control unit 2. This releases the energization prohibition control for the actuator 4, restarts energization of the actuator 4, and restarts the operation of the electric oil pump 3. Thereafter, the value of the power-on disable flag F _ POFF is set to "0" in step 14, and the present process is ended.

On the other hand, when the determination result of step 12 is no, that is, when the oil temperature TOIL is equal to or higher than the third threshold temperature TTHR3, the CPU cooling determination described later is executed in step 15. Also, in the next step 16, it is discriminated whether or not the value of the CPU cooling flag F _ COL set by the CPU cooling determination is "1". If the determination result is yes, the routine proceeds to step 13, where the energization-inhibited control for the driver 4 is released. On the other hand, if the determination result is no, the energization prohibition control is not released and the present process is ended.

Fig. 4 shows a subroutine of the CPU cooling determination process. In the present processing, first, in step 21, a difference Δ T obtained by subtracting oil temperature TOIL from second threshold temperature TTHR2 is calculated. Next, in step 22, the calculated difference value Δ T is added to the current integrated value Σ Δ T to obtain a new integrated value Σ Δ T. In this way, the integrated value Σ Δ T is a value obtained by integrating the difference Δ T calculated in each execution cycle of the CPU cooling determination process. After the energization prohibition control is executed, the integrated value Σ Δ T is reset at the start of the first CPU cooling determination process. Then, in step 23, it is determined whether or not the integrated value Σ Δ T is larger than a predetermined value TREF. When the determination result is negative, the process proceeds to step 24, where the value of the CPU cooling flag F _ COL is set to "0", and the process is terminated. On the other hand, when the determination result is yes, it is determined that the CPU is sufficiently cooled, the process proceeds to step 25, the value of the CPU cooling flag F _ COL is set to "1", and the present process is ended. Thereafter, as described above, the value of the CPU cooling flag F _ COL is determined in step 16 in fig. 3, and the energization prohibition control is continued in the case of "0" and is released in the case of "1".

As described above, in the CPU cooling determination, when the integrated value Σ Δ T of the difference Δ T obtained by subtracting the value of the oil temperature TOIL from the second threshold temperature TTHR2 exceeds the predetermined value TREF, it is determined that the CPU is sufficiently cooled. That is, instead of immediately determining the cooling of the CPU according to whether or not the value of oil temperature TOIL is lower than second threshold temperature TTHR2, it is determined that the CPU is sufficiently cooled when the integrated value Σ Δ T of difference Δ T calculated in each execution cycle exceeds predetermined value TREF in order to reflect the elapsed time in this state after calculating how much the value of oil temperature TOIL is lower than second threshold temperature TTHR2 as difference Δ T (TTHR 2-TOIL), as shown in fig. 5.

With the above CPU cooling determination processing, when the oil temperature TOIL is high, a longer elapsed time is required before it is determined that the CPU is sufficiently cooled, and on the other hand, when the oil temperature TOIL is low, it is estimated that the temperature of the CPU has also sufficiently decreased, so it is possible to determine that the CPU is sufficiently cooled with a shorter elapsed time. Therefore, the determination of the cooling of the CPU can be performed with higher accuracy and in a shorter time than the case where only whether the oil temperature TOIL is lower than the predetermined temperature is used as the determination condition.

As described above, in the cancellation determination of the energization prohibition control, when oil temperature TOIL is lower than second threshold temperature TTHR2 and lower than third threshold temperature TTHR3, energization prohibition control for actuator 4 is immediately cancelled, and when oil temperature TOIL is lower than second threshold temperature TTHR2 but equal to or higher than third threshold temperature TTHR3, whether or not the CPU is cooled is determined using integrated value Σ Δ T of difference Δ T obtained by subtracting the value of oil temperature TOIL from second threshold temperature TTHR 2. Thus, the substrate temperature TCPU can be estimated with high accuracy from the oil temperature TOIL, and the energization prohibition control for the actuator 4 can be released appropriately and in a short time.

Next, a control process executed at the time of startup of the control unit 2 will be described with reference to fig. 6. In this process, when the control unit 2 is activated by starting the energization of the control unit 2, it is determined whether or not the value of the energization disable flag F _ POFF is "1" in step 31. If the determination result is no, the relay provided in the wiring for supplying power to the driver 4 is turned on by the instruction of the control unit 2 in step 32, and the present process is ended. On the other hand, if the determination result is yes, the relay is turned off by the instruction of the control unit 2 in step 33, and the present process is ended.

By executing the control processing at the time of startup of the control unit 2, for example, even when the energization of the control unit 2 is resumed while the substrate temperature TCPU is still at a high temperature after a temporary power loss to the control unit 2 due to an instantaneous power failure or the like occurs during a period in which the substrate temperature TCPU rises and the energization prohibition control is being executed, the control unit 2 prohibits the energization of the driver 4 with reference to the value of the energization prohibition flag F _ POFF stored in the storage unit 8, and thus the CPU of the circuit board of the driver 4 can be reliably protected.

After the end of this processing, as described above, the control processing for inhibiting energization to the driver 4 and the cancellation determination processing for the energization inhibition control described with reference to fig. 2 to 5 are repeatedly executed at predetermined cycles, for example.

Next, a hydraulic pressure supply device to which the electric power supply control device according to the embodiment of the present invention can be applied will be described with reference to fig. 7. The oil pressure supply device 21 includes the electric oil pump 3 and another oil pump Pb provided on the upstream side of the electric oil pump 3.

The other oil pump Pb is driven by the engine ENG, draws up oil (working oil) from a tank (not shown), and pressure-feeds the oil. An oil passage L1 through which oil pressure-fed from the other oil pump Pb flows is connected to the output side of the other oil pump Pb. A low-pressure system of the transmission is connected to a downstream side of the oil passage L1. The low-pressure system is a low-pressure hydraulic operating unit such as a torque converter (torque converter). Further, the electric oil pump 3 is connected to the downstream side of the oil passage L1.

The electric oil pump 3 is driven by the rotation of the motor 12, and further pressurizes and pressure-feeds the oil supplied from the other oil pump Pb. An oil passage L2 through which oil pressure-fed from the electric oil pump 3 flows is connected to the output side of the electric oil pump 3. A high-pressure system of the transmission is connected to a downstream side of the oil passage L2. The high-pressure system is a high-pressure hydraulic operating unit such as a belt-type and hydraulic continuously variable transmission mechanism having a driven pulley and a driving pulley, not shown. The high-pressure system is provided with an oil temperature sensor (not shown) that detects the temperature of the oil supplied from the electric oil pump 3 as an oil temperature TOIL.

The power supply control device according to the embodiment of the present invention can be applied to the hydraulic pressure supply device having the above-described configuration. According to the above configuration, the electric oil pump 3 is connected in series with the other oil pump Pb, and the oil pressure supplied from the other oil pump Pb is further pressurized and supplied to the high-pressure system. Therefore, for example, compared to a case where two oil pumps are used in parallel for different applications, such as when the other oil pump Pb supplies oil pressure only to the low-pressure system and the electric oil pump 3 draws oil from the tank and then supplies oil pressure to the high-pressure system, the motor 12 that drives the electric oil pump 3 is used more frequently and the high-temperature oil passes through the electric oil pump 3 more frequently. Therefore, the temperature of the circuit board of the driver 4 is also likely to increase, but in this case, the control unit 2 executes the energization prohibition control for the driver 4, thereby effectively preventing the breakage or malfunction of the driver 4.

The present invention is not limited to the embodiments described above, and can be implemented in various forms. For example, in the embodiment, the oil temperature of the transmission is used as a temperature parameter having a high correlation with the substrate temperature of the actuator of the electric oil pump, and the determination of the cancellation of the energization prohibition control is performed based on this, but the determination is not limited to the oil temperature of the transmission, and another temperature parameter having a correlation with the substrate temperature of the actuator may be used. Examples of the other temperature parameters include a water temperature of cooling water, an intake air temperature, a battery temperature, and an ambient temperature in the engine compartment. The determination of the cancellation of the energization prohibition control may be performed using one or two or more of these temperature parameters.

In the embodiment, the value of the energization prohibition flag F _ POFF is stored in the storage portion 8 of the control unit 2, but the storage portion storing the value of the energization prohibition flag F _ POFF may be configured as a part of a higher-level control unit or may be configured as an independent component as long as the control unit 2 can be referred to at the time of startup. In addition, the structure of the fine portion may be appropriately changed within the scope of the gist of the present invention.