JP2015105696A - Hydraulic oil temperature estimation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic oil temperature estimation device which can estimate a temperature of hydraulic oil on the basis of a current for driving electric oil pumps.SOLUTION: A hydraulic oil temperature estimation device comprises: a load torque calculation part 13 which calculates load torque Tmop acting on electric oil pumps 11, 11a and 11b on the basis of a current Imop for driving the electric oil pumps 11, 11a and 11b whose rotation numbers and discharge amounts of hydraulic oil form linear shapes; a viscosity calculation part 14 which calculates the viscosity ν of the hydraulic oil on the basis of the load torque Tmop; and an estimated oil temperature calculation part 16 which calculates an estimated oil temperature TEe of the hydraulic oil on the basis of the viscosity ν of the hydraulic oil. Thereby, a temperature of the hydraulic oil can be easily estimated at a low cost on the basis of the current Imop for driving the electric oil pumps 11, 11a and 11b.

Description

  The present invention relates to a hydraulic oil temperature estimation device, and more particularly to a technique for estimating the temperature of hydraulic oil using an electric oil pump.

  Conventionally, the temperature of hydraulic oil is detected by an oil temperature sensor such as a thermistor. If the oil temperature sensor outputs a signal indicating the normal operating oil temperature range even though it has failed, that is, the oil temperature sensor value has an offset error with respect to the actual oil temperature value, and the actual oil temperature value changes On the other hand, there is an offset abnormality mode in which the oil temperature sensor value changes following the change, but always has a deviation due to an offset error. In order to be able to determine the abnormality of the oil temperature sensor in such an offset abnormality mode, after the engine is started and the vehicle running state has passed a predetermined time or more, the outside air temperature is compared with the oil temperature, and the oil temperature is more than the outside air temperature. It is known that the oil temperature sensor determines that the temperature is abnormal when the temperature is lower. (For example, see Patent Document 1)

  In addition, when the engine is restarted after waiting for the engine to cool down from the engine warm-up state, the sensor value from the engine-side temperature sensor (for example, the water temperature sensor) and the oil temperature sensor value from the oil temperature sensor What determines whether the up-and-down deviation width is below a predetermined threshold is known. (For example, see Patent Document 2)

JP 2004-11869 A JP 2013-96385 A

  However, in the technique described in Patent Document 1, an accurate determination result cannot be obtained unless a sufficient vehicle running time is waited after the engine is started and the oil temperature is not sufficiently lowered.

  Moreover, in the technique described in Patent Document 2, since it is necessary to perform abnormality determination in a state where the oil temperature and the cooling water temperature are lowered to the outside air temperature, the state in which abnormality determination can be performed is limited, and the oil temperature is If the engine is started before the temperature has fallen to the level corresponding to the outside air temperature, there is a possibility that the determination cannot be made or an erroneous determination is made.

  The present invention has been devised in view of such circumstances, and provides a hydraulic oil temperature estimation device that can estimate the temperature of hydraulic oil based on the current that drives the electric oil pump when the electric oil pump is used. The purpose is to do.

  In order to solve the above-mentioned problem, the hydraulic oil temperature estimation device according to claim 1 is a load torque that acts on the electric oil pump based on a current that drives the electric oil pump whose rotation speed and hydraulic oil discharge amount are linear. A load torque calculation unit that calculates the viscosity of the hydraulic oil based on the load torque, and an estimated oil temperature calculation unit that calculates an estimated oil temperature of the hydraulic oil based on the viscosity of the hydraulic oil And the gist of the above.

  According to this, the temperature of the hydraulic oil can be estimated easily and inexpensively based on the current that drives the electric oil pump.

  According to a second aspect of the present invention, there is provided a hydraulic oil temperature estimation device according to the first aspect, wherein the electric oil pump causes hydraulic oil to act on hydraulic equipment mounted on a vehicle.

  According to this, the temperature of hydraulic fluid can be estimated based on the electric current which drives the electric oil pump provided in the operating device mounted in the vehicle.

  The hydraulic oil temperature estimation device according to claim 3 is the electronic control unit according to claim 2, wherein the load torque calculation unit, the viscosity calculation unit, and the estimated oil temperature calculation unit control oil pressure with respect to the operating device. The gist of the calculation processing is as follows.

  According to this, estimation of hydraulic oil temperature is realizable on the program of the electronic control unit which controls an operating device.

  According to a fourth aspect of the present invention, in the hydraulic oil temperature estimation device according to the second or third aspect, the operating device includes an oil temperature sensor that detects a temperature of the hydraulic oil, and the estimated oil temperature is an abnormality of the oil temperature sensor. The gist is used for judgment.

  According to this, the abnormality of the oil temperature detection in the operating device provided with the oil temperature sensor can be determined with an inexpensive configuration without providing a special additional mechanism, and the configuration becomes simple.

  According to a fifth aspect of the present invention, there is provided a hydraulic oil temperature estimating apparatus according to any one of the second to fourth aspects, wherein the operating device is controlled using the estimated oil temperature as control information.

  According to this, the estimated oil which is information from the electric oil pump provided in the operating device when the operating device does not include the oil temperature sensor or when the oil temperature detection abnormality is detected in the operating device including the oil temperature sensor. The operating device can be appropriately controlled by the temperature.

  According to a sixth aspect of the present invention, in the hydraulic oil temperature estimation device according to any one of the second to fifth aspects, the operating device connects between the engine of the vehicle and a drive motor connected to the automatic transmission side of the vehicle. The gist is that it is a hybrid clutch that can be made.

  According to this, the estimated oil which is information from the electric oil pump provided in the hybrid clutch when the hybrid clutch is not provided with the oil temperature sensor or when the oil temperature detection in the hybrid clutch provided with the oil temperature sensor is abnormal. Since the hybrid clutch can be appropriately controlled at the temperature, it is possible to prevent the delay in switching to the released state of the hybrid clutch and the deterioration of the fuel consumption or the increase of exhaust gas.

  According to a seventh aspect of the present invention, there is provided a hydraulic oil temperature estimation device according to any one of the second to fifth aspects, wherein the operating device is a transmission mechanism of an automatic transmission of the vehicle.

  According to this, the transmission mechanism of the automatic transmission is not equipped with the oil temperature sensor, or when the oil temperature detection in the transmission mechanism of the automatic transmission equipped with the oil temperature sensor is abnormal, The transmission mechanism of the automatic transmission can be appropriately controlled with the estimated oil temperature, which is information from the installed electric oil pump. It is possible to prevent the gas from increasing.

1 is a block diagram showing a first embodiment of the present invention. It is a control flowchart in a 1st embodiment of the present invention. It is a graph which shows the characteristic of the motor current-load torque of an electric oil pump. It is a graph which shows the characteristic of the viscosity of hydraulic fluid-oil temperature. It is a block diagram which shows 2nd Embodiment of this invention. It is a control flowchart in a 2nd embodiment of the present invention. It is a schematic diagram which shows notionally the vehicle which concerns on application of this invention.

[First embodiment]
A hydraulic oil temperature estimation device 10 according to a first embodiment of the present invention will be described with reference to FIGS.
The temperature of the hydraulic oil changes in proportion to the viscosity of the hydraulic oil, and the viscosity of the hydraulic oil changes in proportion to the load torque that drives the electric oil pump that operates the hydraulic oil. , Proportional to motor current. In the present invention, paying attention to this proportional relationship, the viscosity of the hydraulic oil is calculated from the load torque based on the motor current that drives the electric oil pump that operates the hydraulic oil, and the change in the viscosity of the hydraulic oil is calculated as the temperature of the hydraulic oil. It is estimated as a change.

  Specifically, the hydraulic oil temperature estimation device 10 that estimates the temperature of the hydraulic oil, as shown in FIG. 1, receives the motor current Imop and the motor rotation speed Nmop of the electric oil pump 11 that operates the hydraulic oil whose temperature is to be detected. The load torque calculation unit 13 is provided. When the electric oil pump 11 is in a steady rotation state, the rotational speed and the discharge amount of the hydraulic oil are linear, that is, the hydraulic oil is discharged at a predetermined discharge amount according to the motor rotation speed Nmop. The load torque calculation unit 13 confirms that the input motor rotation speed Nmop is in a steady rotation state, and then the input motor current Imop and the motor current-load torque characteristic map of the electric oil pump 11 shown in FIG. Is used to calculate the motor load torque Tmop of the electric oil pump 11.

The viscosity calculation unit 14 calculates the viscosity ν of the hydraulic oil based on the motor load torque Tmop, the motor angular velocity ω, and the device constant Ks of the electric oil pump 11 input via the device constant unit 15. The viscosity ν can be calculated using the following formula 1.
[Equation 1]
ν = Ks × (Tmop ÷ ω)

  The estimated oil temperature calculation unit 16 calculates the estimated oil temperature TEe of the working oil using the viscosity ν of the working oil output from the viscosity calculating unit 14 and the map of the viscosity-temperature characteristic of the working oil shown in FIG.

  FIG. 2 shown next shows a hydraulic oil temperature estimation program for executing the functions of the units 11 to 16 shown in FIG. 1 in a flowchart, and is executed by an electronic control unit to be described later. The control process of this program is started on the condition that the electric oil pump 11 is in a steady state that is equal to or higher than a predetermined rotational speed. In step S11, the motor current Imop of the electric oil pump 11 is input, In step S12, the motor rotational speed Nmop of the electric oil pump 11 is input.

  Next, in step S13, the motor load torque Tmop of the electric oil pump 11 is calculated using the input motor current Imop and the motor oil-load torque characteristic map of the electric oil pump 11 shown in FIG.

  Next, in step S14, based on the calculated motor load torque Tmop, the device constant Ks, and the motor angular velocity ω, the viscosity ν of the hydraulic oil is calculated using Equation 1 described above.

  Next, in step S15, the estimated hydraulic oil temperature TEe of the hydraulic oil is calculated using the calculated hydraulic oil viscosity ν and the hydraulic oil viscosity-temperature characteristic map shown in FIG.

[Second Embodiment]
The hydraulic oil temperature estimation apparatus 20 of 2nd Embodiment of this invention is demonstrated based on FIG.5 and FIG.6.
The hydraulic oil temperature estimation device 20 uses the estimated hydraulic oil temperature TEe of the estimated hydraulic oil as control information as well as for determining an abnormality in an oil temperature sensor (for example, a thermistor) that detects the temperature of the hydraulic oil. It can be done.

  Specifically, as shown in FIG. 5, the hydraulic oil temperature estimation device 20 is added to the electric oil pump 11, the load torque calculation unit 13, the viscosity calculation unit 14, the device constant unit 15, and the estimated oil temperature calculation unit 16 described above. For example, an oil temperature sensor 17 that detects the temperature of hydraulic oil such as a thermistor is provided. The configuration and operation of the electric oil pump 11, the load torque calculation unit 13, the viscosity calculation unit 14, the device constant unit 15 and the estimated oil temperature calculation unit 16 are the same as those in the first embodiment, and thus detailed description thereof is omitted. .

  The oil temperature sensor 17 outputs the detected oil temperature TEs of the hydraulic oil. The fail determination unit 18 performs comparison determination by using the detected oil temperature TEs from the oil temperature sensor 17 and the estimated oil temperature TEe from the estimated oil temperature calculation unit 16 as inputs. This failure determination is to determine an oil temperature offset of the detected oil temperature TEs detected by the oil temperature sensor 17, and the absolute value of the difference ΔTEg between the detected oil temperature TEs and the estimated oil temperature TEe is set in advance. It is determined whether or not it is larger than the threshold value P.

  The fail safe processing unit 19 looks at the difference ΔTEg between the detected oil temperature TEs and the estimated oil temperature TEe as an absolute value, and when this value is larger than a preset threshold value P, the oil temperature sensor 17 detects that the oil temperature offset is abnormal. And an alarm indicator (not shown) such as an alarm buzzer is turned on and alarmed, and the oil temperature of the hydraulic oil is replaced with the estimated oil temperature TEe. The estimated oil temperature TEe is used as control information. Further, the fail safe processing unit 19 looks at the difference ΔTEg between the detected oil temperature TEs and the estimated oil temperature TEe as an absolute value, and when this value is smaller than a preset threshold value P, the oil temperature of the hydraulic oil is detected by the oil temperature sensor. The detected oil temperature TEs detected by 17 is used as control information.

  Next, FIG. 6 shows a hydraulic oil temperature estimation program for executing the functions of the units 11 to 19 shown in FIG. 5 in a flowchart, which is implemented by an electronic control unit described later. In the control process of this program, following the calculation of the estimated oil temperature TEe of the hydraulic oil in steps S11 to S15, the detected oil temperature TEs by the oil temperature sensor 17 is input in step S16.

  Next, in step S17, the absolute value of the difference ΔTEg between the detected oil temperature TEs from the oil temperature sensor 17 and the estimated oil temperature TEe calculated in step S15 is calculated. Next, in step S18, an oil temperature offset of the detected oil temperature TEs detected by the oil temperature sensor 17 is determined. The difference ΔTEg between the detected oil temperature TEs and the estimated oil temperature TE is viewed as an absolute value, and this value is calculated. It is determined whether or not it is larger than a preset threshold value P.

  If the determination result in step 18 is Yes (ΔTEg> P), it is detected that the oil temperature sensor 17 is abnormal in oil temperature offset, and the process proceeds to step S19 to turn on an abnormality display light (not shown) or An alarm (not shown) such as an alarm buzzer is operated to give an alarm, and the oil temperature of the hydraulic oil is replaced with the estimated oil temperature TEe, and the estimated oil temperature TEe is used as control information.

  On the other hand, if the determination result in step 18 is No (ΔTEg ≦ P), it is determined that the oil temperature sensor 17 has no abnormality including an oil temperature offset, and the oil temperature sensor 17 detects the oil temperature of the hydraulic oil. The detected oil temperature TEs is used as control information.

  Next, an operation device mounted on a vehicle to which the hydraulic oil temperature estimation device 10 or 20 of the present invention can be applied and operated by an electric oil pump will be described with reference to FIG.

  A hybrid vehicle (hereinafter simply referred to as a vehicle) 30 on which the hydraulic oil temperature estimation device 10 or 20 according to the present embodiment is mounted is a vehicle that drives driving wheels by an engine and a motor. The engine and motor can be optimally used for both the driving force of the engine and the motor. From the EV traveling using only the motor, the engine can be efficiently operated according to the situation where the engine and the motor are used, and the engine can be used during regeneration and EV traveling. The engine is completely disconnected from the drive train, eliminating the loss due to engine resistance.

  The vehicle 30 includes an engine EG, a motor generator MG, a hybrid clutch 31, an automatic transmission ATM (hereinafter abbreviated as ATM), an inverter INV, a battery BT, a hybrid ECU 32 (hereinafter abbreviated as HV-ECU 32), an engine ECU 33, and a hybrid clutch. ECU 34 (hereinafter abbreviated as HV clutch ECU 34), automatic transmission ECU 35 (hereinafter abbreviated as ATM-ECU 35), and motor generator ECU 36 (hereinafter abbreviated as MG-ECU 36). The engine ECU 33 is an electronic control device that controls the engine EG. The HV clutch ECU 34 is an electronic control device that controls the hybrid clutch. The ATM-ECU 35 is an electronic control device that controls the ATM. The motor generator ECU 36 is an electronic control device that controls the motor generator MG. The HV-ECU 32 is a host electronic control device that performs overall control of vehicle travel. The HV-ECU 32, the engine ECU 33, the HV clutch ECU 34, the ATM-ECU 35, and the MG-ECU 36 can communicate with each other via a CAN (Controller Area Network). Here, the hybrid ECU 32, the engine ECU 33, the HV clutch ECU 34, the ATM-ECU 35, and the MG-ECU 36 will be described separately, but the present invention is not limited to this, and the hybrid ECU 32, the engine ECU 33, the HV clutch ECU 34, and the ATM- The ECU 35 and the MG-ECU 36 may be integrated.

  The hybrid clutch 31 is provided between the engine EG and a motor generator MG provided on the input side of the automatic transmission ATM, and transmits the power from the engine EG to the motor generator MG. It is switched from the motor generator MG to a release state in which the power from the engine EG is not transmitted to the motor generator MG. The flywheel 37 keeps the rotation of the engine EG stable, and the damper 38 reduces the vibration of the engine EG.

  The automatic transmission ATM has a torque converter 39 connected to the motor generator MG, and a transmission mechanism 40 such as a clutch and a brake that are connected to the torque converter 39 to form respective gear stages, and the drive wheels WH are connected via a differential DF. Is driven.

  The motor generator MG operates as a drive motor that applies torque to the drive wheels WH, and also operates as a generator that converts kinetic energy of the vehicle into electric power.

  Inverter INV is electrically connected to motor generator MG and battery BT. The inverter INV is connected to the MG-ECU 36 so as to be communicable. The inverter INV boosts the DC current supplied from the battery BT based on a control signal from the MG-ECU 36, converts the DC current into an AC current, and supplies the torque to the motor generator MG. To function as a drive motor. The inverter INV causes the motor generator MG to function as a generator based on a control signal from the MG-ECU 36, converts the alternating current generated by the motor generator MG into a direct current, and lowers the voltage. The battery BT is charged. The battery BT is a rechargeable secondary battery.

  Based on a control signal from the HV clutch ECU 34, the hydraulic oil acting on the hybrid clutch 31 is controlled by the solenoid 41, and the hybrid clutch 31 is switched between the engaged state and the released state. The hybrid clutch 31 has a hybrid clutch electric oil pump 11a that operates hydraulic oil.

  The estimation of the temperature of the hydraulic oil acting on the hybrid clutch 31 is performed by a calculation process by the HV clutch-ECU 34 that executes a program corresponding to the flowchart shown in FIG. The hybrid clutch 31 corresponds to an operating device using the electric oil pump in the present invention, and is not provided even with an oil temperature sensor 17a such as a thermistor for detecting the temperature of the operating oil as exemplified above. However, when the oil temperature sensor 17a is provided, a backup of the oil temperature estimation at the time of the oil temperature detection failure in the conventional hybrid clutch 31 can be performed.

  When the hybrid clutch 31 is controlled using the oil temperature information which is the oil temperature sensor value by the oil temperature sensor 17a which is deviated from the actual oil temperature value of the hydraulic oil of the hybrid clutch 31, the hybrid due to the abnormality of the oil temperature sensor 17a. There is a problem that the amount of exhaust gas increases as fuel consumption deteriorates due to delay in switching the clutch 31 to the released state. On the other hand, there is an OBD regulation (OBD: Abbreviation of On-Board Diagnostics) that obliges to monitor the exhaust gas control status of automobiles with an in-vehicle computer. It is necessary to inform the driver. In the hybrid clutch 31 to which the present invention is applied, as described above, the HV clutch ECU 34 executes a program corresponding to the flowchart shown in FIG. 6 to turn on an abnormality display light (not shown) when the oil temperature sensor 17a is abnormal. The oil temperature of the hydraulic oil can be replaced with the estimated oil temperature TEe calculated based on the operation of the electric oil pump 11a, and appropriate control is performed using the estimated oil temperature TEe as control information for the hybrid clutch 31. Therefore, it is possible to prevent the hybrid clutch 31 from switching to the released state and delaying the fuel consumption and increasing the exhaust gas.

  The transmission mechanism 40 of the automatic transmission ATM is a servo hydraulic pressure controlled based on a control signal of the ATM-ECU 35, and includes an automatic transmission ATM electric oil pump 11b that operates hydraulic oil of the servo hydraulic pressure. The estimation of the temperature of the hydraulic oil acting on the speed change mechanism 40 is performed by arithmetic processing by the ATM-ECU 34 that executes a program corresponding to the flowchart shown in FIG. 2 or FIG. The speed change mechanism 40 corresponds to an operating device using the electric oil pump in the present invention, and does not include an oil temperature sensor 17b such as a thermistor for detecting the temperature of the operating oil as exemplified above. However, when the oil temperature sensor 17b is provided, it is possible to back up the oil temperature estimation during the oil temperature detection failure in the transmission mechanism 40 of the conventional automatic transmission ATM.

  When the transmission mechanism 40 is controlled using the oil temperature information that is the oil temperature sensor value by the oil temperature sensor 17a that is deviated from the actual oil temperature value of the hydraulic oil of the transmission mechanism 40, it is necessary due to an abnormality in the oil temperature sensor 17b. As described above, there is a problem in that the amount of exhaust gas increases as fuel efficiency deteriorates due to the selection of the gear position on the low gear side. On the other hand, there is an OBD regulation (OBD: Abbreviation of On-Board Diagnostics) that obliges to monitor the exhaust gas control status of automobiles with an in-vehicle computer. It is necessary to inform the driver. In the transmission mechanism 40 to which the present invention is applied, as described above, the ATM-ECU 35 executes a program corresponding to the flowchart shown in FIG. 6 to turn on an abnormality display light (not shown) when the oil temperature sensor 17b is abnormal. The oil temperature of the hydraulic oil can be replaced with the estimated oil temperature TEe calculated based on the operation of the electric oil pump 11b, and appropriate control is performed using the estimated oil temperature TEe as the control information of the transmission mechanism 40. Therefore, it is possible to prevent the fuel efficiency from deteriorating or the exhaust gas from increasing due to selection of a lower speed gear than necessary.

  As described above, according to the hydraulic oil temperature estimation devices 10 and 20 of the embodiment of the present invention, based on the current Imop that drives the electric oil pumps 11, 11 a, and 11 b whose rotation speed and hydraulic oil discharge amount are linear. The load torque calculation unit 13 that calculates the load torque Tmop acting on the electric oil pumps 11, 11a, and 11b, the viscosity calculation unit 14 that calculates the viscosity ν of the hydraulic oil based on the load torque Tmop, and the viscosity ν of the hydraulic oil And an estimated oil temperature calculation unit 16 that calculates the estimated oil temperature TEe of the hydraulic oil, based on the current Imop that drives the electric oil pumps 11, 11a, 11b, and easily and inexpensively estimates the temperature of the hydraulic oil. be able to.

  As described above, according to the hydraulic oil temperature estimation devices 10 and 20 of the embodiment of the present invention, the electric oil pumps 11, 11 a, and 11 b apply hydraulic pressure to the hydraulic devices 31 and 40 mounted on the vehicle with hydraulic oil. Therefore, the temperature of the hydraulic oil can be estimated based on the current Imop that drives the electric oil pumps 11, 11a, 11b provided in the operating devices 31, 40 mounted on the vehicle.

  As described above, according to the hydraulic oil temperature estimation devices 10 and 20 of the embodiment of the present invention, the load torque calculation unit 13, the viscosity calculation unit 14, and the estimated oil temperature calculation unit 16 are provided for the operation devices 31 and 40. Therefore, the hydraulic oil temperature can be estimated on the program of the electronic control units 34 and 35 that control the operating devices 31 and 40.

  As described above, according to the operating oil temperature estimation devices 10 and 20 of the embodiment of the present invention, the operating devices 31 and 40 include the oil temperature sensors 17, 17 a, and 17 b that detect the temperature of the operating oil, and the estimated oil Since the temperature is used to determine the abnormality of the oil temperature sensors 17, 17a, 17b, a special additional mechanism is provided for the abnormality of the oil temperature detection in the operating devices 31, 40 provided with the oil temperature sensors 17, 17a, 17b. Therefore, the determination can be made with an inexpensive configuration, and the configuration becomes simple.

  As described above, according to the hydraulic oil temperature estimation devices 10 and 20 of the embodiment of the present invention, the hydraulic devices 31 and 40 are controlled using the estimated oil temperature as control information. The electric oil pump 11 provided in the operating devices 31, 40 without the sensors 17, 17 a, 17 b or when the oil temperature detection in the operating devices 31, 40 with the oil temperature sensors 17, 17 a, 17 b is abnormal. , 11a and 11b, the operating devices 31 and 40 can be appropriately controlled with the estimated oil temperature TEe which is information.

  As described above, according to the hydraulic oil temperature estimation devices 10 and 20 of the embodiment of the present invention, the operating device 31 is between the engine EG of the vehicle 30 and the drive motor MG connected to the automatic transmission ATM side of the vehicle 30. Therefore, the hybrid clutch 31 is not provided with the oil temperature sensor 17a, or is provided in the hybrid clutch 31 when the oil temperature detection in the hybrid clutch 31 with the oil temperature sensor 17a is abnormal. The hybrid clutch 31 can be appropriately controlled with the estimated oil temperature TEe, which is information from the electric oil pump 11a, so that when the oil temperature sensor 17a is abnormal, the abnormality display light can be turned on and the hydraulic oil can be turned on. The estimated oil temperature TEe calculated based on the operation of the electric oil pump 17a is replaced with the estimated oil Since proper control can be performed using TEe as control information for the hybrid clutch 31, it is possible to prevent the switching of the hybrid clutch 31 to the released state and delay the fuel consumption or increase the exhaust gas. .

  As described above, according to the hydraulic oil temperature estimation devices 10 and 20 of the embodiment of the present invention, the operating device 40 is the transmission mechanism 40 of the automatic transmission ATM of the vehicle 30, and thus the transmission mechanism of the automatic transmission ATM. 40 is an electric motor provided in the transmission mechanism 40 of the automatic transmission ATM without the oil temperature sensor 17b or when the oil temperature detection in the transmission mechanism 40 of the automatic transmission ATM equipped with the oil temperature sensor 17b is abnormal. Since the speed change mechanism 40 of the automatic transmission ATM can be appropriately controlled with the estimated oil temperature TEe as information from the oil pump 11b, the fuel consumption is deteriorated by selecting a lower speed side than necessary, and the exhaust gas is exhausted. It is possible to prevent the gas from increasing.

DESCRIPTION OF SYMBOLS 10 ... Hydraulic oil temperature estimation apparatus 11, 11a, 11b ... Electric oil pump 13 ... Load torque detection part 14 ... Viscosity calculation part 16 ... Estimated oil temperature calculation part 17, 17a, 17b ..Oil temperature sensors 17a, 17b ... oil temperature sensor 20 ... hydraulic oil temperature estimating device 31 ... hybrid clutch 34 ... HV clutch ECU
35 ... ATM-ECU
40 ... Transmission mechanism ATM ... Automatic transmission EG ... Engine MG ... Motor generator

Claims (7)

A load torque calculation unit that calculates a load torque that acts on the electric oil pump based on a current that drives the electric oil pump whose rotation speed and hydraulic oil discharge amount are linear;
A viscosity calculating unit that calculates the viscosity of the hydraulic oil based on the load torque;
An operating oil temperature estimation device comprising: an estimated oil temperature calculating unit that calculates an estimated oil temperature of the operating oil based on the viscosity of the operating oil.   The hydraulic oil temperature estimation apparatus according to claim 1, wherein the electric oil pump causes hydraulic pressure to act on hydraulic appliances mounted on a vehicle.   The hydraulic oil temperature estimation device according to claim 2, wherein the load torque calculation unit, the viscosity calculation unit, and the estimated oil temperature calculation unit are arithmetic processing performed by an electronic control unit that controls oil pressure with respect to the operating device.   The hydraulic oil temperature estimation device according to claim 2 or 3, wherein the hydraulic device includes an oil temperature sensor that detects a temperature of the hydraulic oil, and the estimated oil temperature is used for determining an abnormality of the oil temperature sensor.   The hydraulic oil temperature estimation device according to any one of claims 2 to 4, wherein the hydraulic device is controlled using the estimated oil temperature as control information.   The hydraulic oil temperature estimation according to any one of claims 2 to 5, wherein the operating device is a hybrid clutch that enables connection between an engine of the vehicle and a drive motor connected to an automatic transmission side of the vehicle. apparatus.   The hydraulic oil temperature estimation device according to any one of claims 2 to 5, wherein the operating device is a transmission mechanism of an automatic transmission of the vehicle.

Images