JP2007295703A - Motor controller, informing device and electric vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor controller for performing the output limitation of a motor by evaluating the heat-resistant reliability of a motor more accurately, and to provide a vehicle equipped with the motor controller. <P>SOLUTION: A torque control section 204 reduces a torque command of a motor generator MG when a motor temperature T exceeds a threshold temperature. A service lifetime operating section 202 calculates an integrated motor use time at a specified temperature based on the motor temperature T according to an Arrhenius rule and activates a signal CTL when the integrated motor use time thus calculated exceeds a threshold. When the signal CTL is activated, the torque control section 204 lowers the limitation temperature of the motor generator MG as compared with that when the signal CTL is not activated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric motor control device, an informing device, and an electric vehicle, and more particularly, an electric motor control device, an informing device, and an electric motor provided with the electric motor, hybrid vehicle, and fuel cell vehicle. Regarding vehicles.

  Japanese Patent Laid-Open No. 2003-304604 (Patent Document 1) discloses a motor drive device mounted as a drive source for various vehicles such as an electric vehicle, a hybrid vehicle, and a fuel cell vehicle. Is disclosed.

  In this motor drive device, when the motor temperature detected by the temperature detection means is equal to or higher than the limit temperature, the motor output control means limits the output of the motor. Here, the temperature change rate detection means detects the change rate of the motor temperature, and changes the setting of the limit temperature according to the detected change rate.

  That is, when the change rate of the motor temperature is equal to or higher than the predetermined change rate, the temperature change rate detection means determines that the temperature rise of the motor is large, sets the limit temperature to the first limit temperature, and outputs the motor output. The control means limits the output of the motor when the motor temperature becomes equal to or higher than the first limit temperature.

  On the other hand, when the rate of change of the motor temperature is smaller than the predetermined rate of change, the temperature change rate detection means determines that the temperature rise of the motor is small and makes the limit temperature higher than the first limit temperature. The second limit temperature is set, and the motor output control means limits the output of the motor when the motor temperature becomes equal to or higher than the second limit temperature.

According to this motor control device, the distance that can be traveled without limiting the output of the motor is extended, the temperature of the motor can be protected, and the performance of the motor can be fully exhibited (see Patent Document 1).
JP 2003-304604 A JP 2000-184502 A JP 2002-370630 A JP 2005-238969 A

  Due to thermal degradation of the insulating material used in the motor, the heat resistance reliability of the motor decreases as the past thermal load of the motor increases. The motor control device disclosed in Japanese Patent Laid-Open No. 2003-304604 achieves both motor temperature protection and motor performance by making the limit temperature of the motor variable according to the rate of change of the motor temperature. No consideration is given to the deterioration of the heat resistance reliability of the motor due to the past heat load of the motor.

  Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide an electric motor control device that more accurately evaluates the heat resistance reliability of the electric motor and limits the output of the electric motor, and a vehicle including the same. Is to provide.

  Another object of the present invention is to provide a notification device that more accurately evaluates the heat resistance reliability of an electric motor and appropriately informs a user of information related to the electric motor, and a vehicle including the notification device.

  According to this invention, the motor control device is an electric motor control device that controls the electric motor that generates the driving force of the vehicle, and calculates the state quantity indicating the service life of the electric motor based on the temperature history of the electric motor. And torque limiting means for limiting the torque of the electric motor based on the state quantity calculated by the calculating means.

  Preferably, the motor control device further includes a changing unit that changes the limit temperature of the motor based on the state quantity calculated by the calculating unit. The torque limiting means limits the torque of the electric motor according to the temperature of the electric motor using the limiting temperature.

  More preferably, when the state quantity calculated by the calculating means exceeds a specified value, the changing means lowers the limit temperature as compared to before the state quantity exceeds the specified value.

Preferably, the state quantity calculated by the calculation means includes an integrated amount of the temperature of the electric motor.
Preferably, the state quantity calculated by the calculating means includes a frequency at which the temperature of the electric motor exceeds a specified temperature.

  According to the invention, the electric vehicle includes an electric motor that generates a driving force of the vehicle, wheels that are mechanically coupled to the output shaft of the electric motor, and any one of the electric motor control devices described above.

  According to the present invention, the notification device is a notification device that notifies the user of information related to the electric motor that generates the driving force of the vehicle, and is a state quantity that indicates the service life of the electric motor based on the temperature history of the electric motor. And a notifying means for notifying the user of part replacement information that prompts replacement of the parts of the motor or part maintenance information that prompts maintenance of the parts based on the state quantity calculated by the calculating means.

Preferably, the state quantity calculated by the calculation means includes an integrated amount of the temperature of the electric motor.
Preferably, the state quantity calculated by the calculating means includes a frequency at which the temperature of the electric motor exceeds a specified temperature.

  According to the invention, the electric vehicle includes an electric motor that generates a driving force of the vehicle, wheels that are mechanically coupled to the output shaft of the electric motor, and any of the above-described notification devices.

  In this invention, the calculation means calculates a state quantity indicating the service life of the motor based on the temperature history of the motor, and the torque limiting means limits the torque of the motor based on the calculated state quantity. The torque of the motor is limited in consideration of the service life of the motor calculated based on the temperature history of the motor.

  Therefore, according to the present invention, it is possible to appropriately limit the output of the electric motor after more accurately evaluating the heat resistance reliability of the electric motor based on the service life of the electric motor.

  In the present invention, the calculating means calculates a state quantity indicating the service life of the motor based on the temperature history of the motor, and the notifying means replaces parts of the motor based on the calculated state quantity. The parts replacement information or the parts maintenance information that prompts the maintenance of the parts is notified to the user. Therefore, the parts replacement information or the parts maintenance information is considered in consideration of the service life of the motor calculated based on the motor temperature history. To be notified.

  Therefore, according to the present invention, it is possible to appropriately notify the user of information related to the motor after more accurately evaluating the heat resistance reliability of the motor based on the service life of the motor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
1 is an overall block diagram for illustrating a power train of an electric vehicle according to Embodiment 1 of the present invention. Referring to FIG. 1, electrically powered vehicle 100 includes a power storage device B, a power supply line PL, a ground line SL, a capacitor C, an inverter 10, a motor generator MG, and wheels DW. Electric vehicle 100 further includes an ECU (Electronic Control Unit) 20, a notification unit 25, a temperature sensor 30, a voltage sensor 40, and a current sensor 50.

  The positive electrode of power storage device B is connected to power supply line PL, and the negative electrode of power storage device B is connected to ground line SL. Inverter 10 is connected to power supply line PL and ground line SL. Capacitor C is connected in parallel to power storage device B between power supply line PL and ground line SL. Motor generator MG includes a Y-connected three-phase coil as a stator coil, and is connected to inverter 10 via a three-phase cable. Then, the rotating shaft of wheel DW is mechanically coupled to the output shaft of motor generator MG. That is, motor generator MG is incorporated in this electric vehicle 100 as an electric motor that drives wheels DW.

  The power storage device B is a chargeable / dischargeable DC power source, and is composed of, for example, a secondary battery such as nickel metal hydride or lithium ion. The power storage device B supplies DC power to the inverter 10. The power storage device B is charged by the inverter 10 during regenerative braking of the vehicle. Note that a large-capacity capacitor may be used as the power storage device B.

  Capacitor C smoothes voltage fluctuations between power supply line PL and ground line SL. Inverter 10 converts a DC voltage received from power supply line PL into a three-phase AC voltage based on signal PWI from ECU 20, and outputs the converted three-phase AC voltage to motor generator MG. Thereby, motor generator MG is driven to generate a specified torque. Inverter 10 also converts the three-phase AC voltage received from motor generator MG into a DC voltage based on signal PWI from ECU 20 during regenerative braking of the vehicle, and outputs the converted DC voltage to power storage device B.

  Motor generator MG is a three-phase AC rotating electric machine, for example, a three-phase AC synchronous motor generator. Motor generator MG generates vehicle driving torque by the three-phase AC voltage received from inverter 10. Motor generator MG receives a rotational force from wheel DW during regenerative braking of the vehicle, generates a three-phase AC voltage, and outputs the generated three-phase AC voltage to inverter 10.

  Temperature sensor 30 detects motor temperature T of motor generator MG, and outputs the detected motor temperature T to ECU 20. As will be described later, since this motor temperature T is used when calculating the accumulated motor use time indicating the service life of the motor generator MG, the temperature measurement point is the insulating material used in the motor generator MG. Among them, the material having the lowest heat resistance or the vicinity thereof is preferable.

  Voltage sensor 40 detects a voltage Vm between terminals of capacitor C and outputs the detected voltage Vm to ECU 20. Current sensor 50 detects motor current MCRT flowing through a three-phase cable connecting inverter 10 to motor generator MG, and outputs the detected motor current MCRT to ECU 20.

  ECU 20 receives torque command TR of motor generator MG and vehicle speed SV from an external ECU (not shown). ECU 20 drives motor generator MG based on torque command TR, vehicle speed SV, motor temperature T from temperature sensor 30, voltage Vm from voltage sensor 40, and motor current MCRT from current sensor 50. The signal PWI is generated, and the generated signal PWI is output to the inverter 10.

  The torque command TR is calculated by an external ECU based on the depression amount of the accelerator pedal and the brake pedal and the traveling state of the vehicle. Vehicle speed SV is calculated by an external ECU based on the rotational speeds of wheels DW, motor generator MG, etc. detected by a rotation sensor (not shown).

  Here, ECU 20 limits the output torque of motor generator MG when motor temperature T exceeds the threshold temperature. Further, the ECU 20 calculates an accumulated motor use time at a specified temperature by a method described later, and changes the threshold temperature based on the calculated accumulated motor use time.

  Further, the ECU 20 activates the signal INF1 or the signal INF2 output to the notification unit 25 based on the calculated accumulated motor usage time.

  When the signal INF1 from the ECU 20 is activated, the notification unit 25 notifies the user of component maintenance information that prompts maintenance of components of the motor generator MG. Further, when the signal INF2 from the ECU 20 is activated, the notification unit 25 notifies the user of component replacement information that prompts replacement of components of the motor generator MG. In addition, the alerting | reporting part 25 may be the display apparatus which alert | reports visually, and the audio | voice apparatus which alert | reports auditorily may be sufficient.

  FIG. 2 is a functional block diagram of ECU 20 shown in FIG. Referring to FIG. 2, ECU 20 includes a service life calculation unit 202, a torque control unit 204, a motor control phase voltage calculation unit 206, and a PWM signal conversion unit 208.

  The service life calculation unit 202 calculates the accumulated motor use time at the specified temperature, and activates the signal CTL output to the torque control unit 204 when the calculated accumulated motor use time exceeds a preset threshold value. To do.

  Here, the accumulated motor use time at the specified temperature is obtained by converting the actual motor use time into the motor use time at the specified temperature (for example, 150 ° C.) using the Arrhenius law. Specifically, the Arrhenius rule is a known life estimation rule that the life is doubled when the use temperature is lowered by 10 ° C. (also referred to as “10 ° C. double rule”), and the service life calculation unit. 202 is defined by calculating the motor usage time at the specified temperature from the average motor temperature per specified time (for example, 1 minute) and integrating the calculated motor usage time from the start of use of the motor generator MG to the present time. Calculate the accumulated motor usage time at temperature.

  The accumulated motor use time at the specified temperature represents a period during which motor generator MG can withstand use, that is, the service life of motor generator MG. Further, integrating the motor use time at the specified temperature from the start of use of the motor generator MG to the present time means calculating the service life of the motor generator MG based on the temperature history of the motor generator MG.

  When the calculated accumulated motor usage time exceeds the first threshold value, the service life calculation unit 202 activates the signal INF1 output to the notifying unit 25 (not shown) and is larger than the first threshold value. When the accumulated motor usage time exceeds the second threshold, the signal INF2 output to the notification unit 25 is activated.

  Torque control unit 204 executes torque limit control for limiting the output torque of motor generator MG based on motor temperature T and threshold temperature of motor generator MG. Specifically, torque control unit 204 reduces torque command TR received from the external ECU when motor temperature T of motor generator MG exceeds the threshold temperature.

  Here, when the signal CTL from the service life calculation unit 202 is activated, the torque control unit 204 lowers the threshold temperature of the motor generator MG compared to when the signal CTL is deactivated. Therefore, when the accumulated motor usage time exceeds the threshold value, the torque of motor generator MG is limited at a lower temperature.

  Torque control unit 204 then outputs torque command TRR, which is limited based on motor temperature T and threshold temperature, to motor control phase voltage calculation unit 206.

  The motor control phase voltage calculation unit 206 is based on the torque command TRR from the torque control unit 204, the voltage Vm from the voltage sensor 40, and the motor current MCRT from the current sensor 50. The voltage applied to each phase coil is calculated, and the calculated each phase coil voltage is output to the PWM signal converter 208.

  The PWM signal conversion unit 208 generates a PWM (Pulse Width Modulation) signal for actually turning on / off each transistor of the inverter 10 based on each phase coil voltage received from the motor control phase voltage calculation unit 206, The generated PWM signal is output as a signal PWI to each transistor of the inverter 10.

  In the ECU 20, for the protection of the motor generator MG, when the motor temperature T exceeds the threshold temperature, the torque control unit 204 reduces the torque command of the motor generator MG.

  Here, the service life calculation unit 202 calculates the accumulated motor use time at the specified temperature, and activates the signal CTL when the calculated accumulated motor use time exceeds a threshold value. Then, torque control unit 204 lowers the threshold temperature in response to activation of signal CTL.

  That is, when the accumulated motor usage time exceeds the threshold value, the threshold temperature that defines the temperature at which torque limitation of motor generator MG is started is lowered, and the motor generator MG is protected.

  FIG. 3 is a diagram showing temporal changes in the accumulated motor usage time calculated by the service life calculation unit 202 shown in FIG. Referring to FIG. 3, the accumulated motor usage time increases with the passage of time. The threshold temperature for torque limitation in the torque control unit 204 is set to the temperature T1 until the accumulated motor usage time reaches the threshold value Sth.

  When the accumulated motor usage time reaches the threshold value Sth, the signal CTL output from the service life calculation unit 202 to the torque control unit 204 is activated, and the torque control unit 204 changes the threshold temperature from the temperature T1 to the temperature T1. Is also lowered to a lower temperature T2. Then, since the torque limitation of motor generator MG is applied at a lower temperature than when the integrated motor use time is smaller than threshold value Sth, the increase in motor temperature T can be suppressed. As a result, after the time t0 when the accumulated motor use time reaches the threshold value Sth, the rate of increase of the accumulated motor use time is suppressed compared to before the time t0.

  In FIG. 3, in order to show the difference in the rate of increase of the accumulated motor use time before and after the accumulated motor use time reaches the threshold value Sth, the accumulated motor use time increases linearly with time change. However, in practice, the usage status (motor temperature, usage time) of the motor generator MG varies from moment to moment, so the accumulated motor usage time does not increase linearly.

  FIG. 4 is a diagram for explaining torque limitation of motor generator MG by torque control unit 204 shown in FIG. Referring to FIG. 4, the horizontal axis indicates motor temperature T of motor generator MG, and the vertical axis indicates torque command TRR of motor generator MG.

  When the signal CTL from the service life calculation unit 202 is deactivated, that is, when the accumulated motor use time calculated by the service life calculation unit 202 does not exceed the threshold value Sth, the torque control unit 204 When the motor temperature T exceeds the threshold temperature Tth1, the torque command is reduced so that the torque command TRR becomes 0 at the upper limit temperature TS1.

  On the other hand, when the signal CTL from the service life calculation unit 202 is activated, that is, when the accumulated motor use time calculated by the service life calculation unit 202 exceeds the threshold value Sth, the torque control unit 204 When the motor temperature T exceeds the threshold temperature Tth2 lower than the threshold temperature Tth1, the torque command is reduced so that the torque command TRR becomes 0 at the upper limit temperature TS2 lower than the upper limit temperature TS1.

  As shown in FIG. 5, when the signal CTL from the service life calculation unit 202 is activated, the torque control unit 204 sets the upper limit temperature when the motor temperature T exceeds the threshold temperature Tth2 (<Tth1). The torque command may be reduced so that the torque command TRR becomes 0 at TS1.

  Further, as shown in FIG. 6, when the signal CTL from the service life calculation unit 202 is activated, the torque control unit 204 determines that the upper limit temperature TS2 (<TS1) when the motor temperature T exceeds the threshold temperature Tth1. ), The torque command may be reduced so that the torque command TRR becomes zero.

  In other words, the “limit temperature” in the present invention is a concept including both the threshold temperature Tth at which torque limitation of the motor generator MG is started and the upper limit temperature TS at which the torque is reduced to 0 by torque limitation.

  FIG. 7 is a flowchart for illustrating a control structure of service life calculation unit 202 shown in FIG. The process shown in this flowchart is called from the main routine and executed at regular time intervals or whenever a predetermined condition is satisfied.

  With reference to FIG. 7, the service life calculation unit 202 calculates the average motor temperature at the specified time using the motor temperature T from the temperature sensor 30 (step S10). Next, the service life calculation unit 202 calculates the motor usage time at the specified temperature from the calculated average motor temperature using the Arrhenius rule (step S20). Specifically, for example, when the average motor temperature for 1 minute is 140 ° C. and the specified temperature is 150 ° C., the motor usage time at the specified temperature is 2 minutes.

  The service life calculation unit 202 calculates the integrated motor use time at the specified temperature by integrating the motor use time calculated in the specified time unit from the start of use of the motor generator MG to the current time (step S30). Next, the service life calculation unit 202 determines whether or not the calculated accumulated motor use time exceeds the first threshold value (step S40). If service life calculation unit 202 determines that the accumulated motor use time is equal to or less than the first threshold value (NO in step S40), the series of processing ends.

  On the other hand, if it is determined in step S40 that the accumulated motor usage time exceeds the first threshold value (YES in step S40), service life calculation unit 202 outputs signal CTL output to torque control unit 204. Activate. Then, torque control unit 204 lowers the motor limit temperature (threshold temperature Tth at which torque limitation is started and / or upper limit temperature TS at which torque is reduced to 0 by torque limitation) lower than when signal CTL is inactivated (step S50). ).

  Furthermore, the service life calculation unit 202 determines whether or not the accumulated motor use time exceeds a second threshold value that is larger than the first threshold value (step S60). When service life calculation unit 202 determines that the accumulated motor use time is equal to or less than the second threshold (NO in step S60), it activates signal INF1 output to notification unit 25. Then, the notification unit 25 notifies the user of part maintenance information that prompts maintenance of parts of the motor generator MG (step S70).

  On the other hand, when it is determined in step S60 that the accumulated motor usage time exceeds the second threshold value (YES in step S60), service life calculation unit 202 outputs signal INF2 output to notification unit 25. Activate. Then, the notification unit 25 notifies the user of component replacement information that prompts replacement of the components of the motor generator MG (step S80).

  FIG. 8 is a flowchart of the torque limit control by the torque control unit 204 shown in FIG. The processing shown in this flowchart is also called and executed from the main routine at regular time intervals or whenever a predetermined condition is satisfied.

  Referring to FIG. 8, torque control unit 204 acquires motor temperature T of motor generator MG from temperature sensor 30, and determines whether motor temperature T exceeds threshold temperature Tth (step S110). As described above, the threshold temperature Tth is set to a temperature lower than that when the signal CTL is inactivated when the signal CTL from the service life calculation unit 202 is activated.

  When torque control unit 204 determines that motor temperature T exceeds threshold temperature Tth (YES in step S110), torque control unit 204 executes torque limit control for reducing torque command TRR in accordance with motor temperature T (step S110). S120). On the other hand, when it is determined in step S110 that motor temperature T is equal to or lower than threshold temperature Tth (NO in step S110), torque control unit 204 ends the process without performing torque limit control.

  In the first embodiment, the motor control temperature (the threshold temperature Tth or the upper limit temperature TS) is changed in the torque control unit 204 in accordance with the signal CTL from the service life calculation unit 202. The motor limit temperature (threshold temperature Tth and / or upper limit temperature TS) may be set from the service life calculation unit 202 to the torque control unit 204 depending on whether or not the accumulated motor use time exceeds a threshold value. Good.

  As described above, in the first embodiment, the accumulated motor use time (specified temperature conversion) indicating the service life of motor generator MG is calculated by service life calculation unit 202, and the accumulated motor use time exceeds the threshold value. Then, the torque of motor generator MG is limited. Therefore, according to the first embodiment, it is possible to appropriately limit the output of motor generator MG after more accurately evaluating the heat resistance reliability of motor generator MG based on the service life of motor generator MG.

  When the accumulated motor usage time exceeds the first threshold value, the notification unit 25 notifies the user of the parts maintenance information, and the accumulated motor usage time becomes the second threshold value (> first threshold value). ), The notification unit 25 notifies the user of component replacement information. Therefore, according to the first embodiment, information regarding motor generator MG can be appropriately notified to the user after more accurately evaluating the heat resistance reliability of motor generator MG based on the service life of motor generator MG. it can.

[Embodiment 2]
In the first embodiment, the accumulated motor usage time at the specified temperature is used as the state quantity indicating the service life of the motor generator MG. However, in the second embodiment, the motor temperature T of the motor generator MG exceeds the threshold temperature. The frequency is used as a state quantity indicating the service life of the motor generator MG.

  In the second embodiment, the configuration of the service life calculation unit 202 in the ECU 20 is different from that of the first embodiment, and other configurations are the same as those of the first embodiment.

  FIG. 9 is a flowchart for illustrating a control structure of service life calculation unit 202A in the second embodiment. The processing shown in this flowchart is also called and executed from the main routine at regular time intervals or whenever a predetermined condition is satisfied.

  Referring to FIG. 9, service life calculation unit 202A obtains motor temperature T of motor generator MG from temperature sensor 30, and determines whether motor temperature T exceeds a threshold temperature (step S210). This threshold temperature is not variable as in the first embodiment, but is a preset fixed temperature.

  If service life calculation unit 202A determines that motor temperature T exceeds the threshold temperature (YES in step S210), it counts up a count value that counts the frequency at which motor temperature T exceeds the threshold temperature (step S210). S220). On the other hand, when it is determined in step S210 that motor temperature T is equal to or lower than the threshold temperature (NO in step S210), service life calculator 202A advances the process to step S230.

  Next, the service life calculation unit 202A determines whether or not the count value exceeds the first threshold value (step S230). If service life calculation unit 202A determines that the count value is equal to or less than the first threshold value (NO in step S230), the series of processing ends.

  On the other hand, when it is determined in step S230 that the count value exceeds the first threshold value (YES in step S230), service life calculation unit 202A activates signal CTL output to torque control unit 204. To do. Then, torque control unit 204 lowers the motor limit temperature (threshold temperature Tth at which torque limitation is started and / or upper limit temperature TS at which torque is reduced to 0 by torque limitation) lower than when signal CTL is inactivated (step S240). ).

  Further, the service life calculation unit 202A determines whether or not the count value exceeds a second threshold value that is larger than the first threshold value (step S250). When service life calculation unit 202A determines that the count value is equal to or smaller than the second threshold value (NO in step S250), the process proceeds to step S260, and the count value exceeds the second threshold value. If it is determined that there is (YES in step S250), the process proceeds to step S270. The processes in steps S260 and S270 are the same as the processes in steps S70 and S80 shown in FIG.

  The other functions of ECU 20 and the other configuration of electric vehicle 100 in the second embodiment are the same as those in the first embodiment.

  In the second embodiment, the same effect as in the first embodiment can be obtained. In the second embodiment, the frequency at which the motor temperature T exceeds the threshold temperature is used as the state quantity indicating the service life of the motor generator MG, so that the calculation load is reduced compared to the first embodiment. be able to.

  In the first and second embodiments, the electric vehicle in which the wheel DW is driven by the motor generator MG is shown. However, the scope of application of the present invention is a hybrid vehicle in which an internal combustion engine is also mounted as a power source, A fuel cell vehicle in which a fuel cell is mounted as a DC power supply instead of the device B is also included.

  Further, a boost converter may be provided between the power storage device B and the inverter 10 to boost the DC voltage from the power storage device B and supply it to the inverter 10.

  In the above, motor generator MG corresponds to “electric motor” in the present invention, and service life calculation units 202 and 202A correspond to “calculation means” in the present invention. The torque control unit 204 corresponds to the “torque limiting unit” in the present invention, and the notification unit 25 corresponds to the “notifying unit” in the present invention. Further, the processing in steps S50 and S240 corresponds to the processing executed by the “changing means” in the present invention.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

It is a whole block diagram for demonstrating the power train of the electric vehicle by Embodiment 1 of this invention. It is a functional block diagram of ECU shown in FIG. It is the figure which showed the time change of the integration motor use time calculated by the service life calculating part shown in FIG. FIG. 3 is a diagram for explaining torque limitation of a motor generator by a torque control unit shown in FIG. 2. It is a figure for demonstrating the other method of the torque limitation of a motor generator. It is a figure for demonstrating the further another method of the torque limitation of a motor generator. It is a flowchart for demonstrating the control structure of the service life calculating part shown in FIG. It is a flowchart of the torque limitation control by the torque control part shown in FIG. 10 is a flowchart for illustrating a control structure of a service life calculation unit in the second embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Inverter, 20 ECU, 25 Informing part, 30 Temperature sensor, 40 Voltage sensor, 50 Current sensor, 100 Electric vehicle, 202, 202A Use life calculating part, 204 Torque control part, 206 Motor control phase voltage calculating part, 208 PWM Signal conversion unit, B power storage device, C capacitor, PL power line, SL ground line, MG motor generator, DW wheel.

Claims (10)

An electric motor control device that controls an electric motor that generates driving force of a vehicle,
Calculation means for calculating a state quantity indicating a service life of the motor based on a temperature history of the motor;
An electric motor control device comprising: torque limiting means for limiting the torque of the electric motor based on the state quantity calculated by the calculating means. Further comprising changing means for changing the limit temperature of the electric motor based on the state quantity,
The motor control device according to claim 1, wherein the torque limiting unit limits the torque of the electric motor according to a temperature of the electric motor using the limiting temperature.   The motor control device according to claim 2, wherein when the state quantity exceeds a specified value, the changing unit lowers the limit temperature than before the state quantity exceeds the specified value.   The electric motor control device according to claim 1, wherein the state quantity includes an integrated amount of the temperature of the electric motor.   The motor control device according to any one of claims 1 to 3, wherein the state quantity includes a frequency at which a temperature of the motor exceeds a specified temperature. An electric motor that generates the driving force of the vehicle;
Wheels mechanically coupled to the output shaft of the motor;
An electric vehicle comprising the electric motor control device according to any one of claims 1 to 5. A notification device that notifies a user of information related to an electric motor that generates driving force of a vehicle,
Calculation means for calculating a state quantity indicating a service life of the motor based on a temperature history of the motor;
A notification device comprising: notification means for notifying the user of part replacement information for prompting replacement of a part of the electric motor or part maintenance information for prompting maintenance of the part based on the state quantity calculated by the calculation means.   The notification device according to claim 7, wherein the state quantity includes an integrated amount of the temperature of the electric motor.   The notification device according to claim 7, wherein the state quantity includes a frequency at which a temperature of the electric motor exceeds a specified temperature. An electric motor that generates the driving force of the vehicle;
Wheels mechanically coupled to the output shaft of the motor;
An electrically powered vehicle comprising the notification device according to any one of claims 7 to 9.

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