JP2006288153A - Controller for mobile object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure insulation performance of a controller according to the amount of generated partial discharge. <P>SOLUTION: An HV-ECU executes a program which includes a step (S1000) of detecting the integrated value of the power spectra in a frequency band corresponding to partial discharge, a step (S1200) of setting Vmax to its upper limit value when the integrated value is smaller than a predetermined value α(YES in S1100), a step (S1300) of setting Vmax×β to its upper limit value when the integrated value is larger than the predetermined value (NO in S1100), and a step (S1400) of controlling a DC/DC converter. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control device for a moving body, and more particularly to a control device that controls an electric motor and an electric device according to a partial discharge amount generated in an electric motor mounted on the moving body.

  In recent years, vehicles such as hybrid vehicles, fuel cell vehicles, electric vehicles and the like that travel with driving force from an electric motor have attracted attention as one of countermeasures for environmental problems. Such a vehicle is equipped with an electric device such as an inverter circuit that supplies electric power to the electric motor, and since the electric motor is driven with a high voltage, it is necessary to ensure insulation.

  For example, Japanese Patent Laying-Open No. 2002-62330 (Patent Document 1) discloses a rotating electrical machine apparatus that evaluates the soundness of an insulating layer between coil turns with high sensitivity. This rotating electrical machine apparatus has a winding composed of a coil having a plurality of turns. The rotating electrical machine apparatus includes a power supply device that generates a surge voltage, a partial discharge detection unit that detects a partial discharge of the insulating layer between turns, and a measurement determination unit that evaluates the detected partial discharge amount. The rotating electrical machine device applies a surge voltage to the line side terminal of the winding, generates a high voltage between the turns of the coil near the line side of the winding, and generates a partial discharge in the inter-turn insulating layer. The rotating electrical machine apparatus measures the relationship between the detected partial discharge amount, the magnitude of the surge voltage, and the steepness of the rising portion, and from this relationship, the partial discharge of the insulating layer between turns is separated from the partial discharges of other insulating layers. Judge separately.

According to the rotating electrical machine apparatus disclosed in Patent Document 1, since the partial discharge of the insulating layer between turns is determined separately from the partial discharge of another insulating layer (coil-to-ground insulating layer), the soundness of the insulating layer between coil turns is determined. It can be evaluated with high sensitivity. In addition, it is possible to prevent the insulation performance of the insulating layer between turns of the rotating electrical machine from being deteriorated, and to improve the reliability of the rotating electrical machine device.
JP 2002-62330 A

  By the way, it is assumed that the vehicle on which the electric motor is mounted travels in a high altitude or high humidity environment. Under such an environment, the dielectric constant of air tends to increase due to a decrease in atmospheric pressure or high humidity. When the dielectric constant of air rises, there is a problem that the amount of partial discharge in the insulator increases in electric devices and electric motors. When the partial discharge amount is increased, there is a problem that the insulating performance of the insulator is deteriorated, and further, the durability life is deteriorated.

  In the rotating electrical machine apparatus disclosed in Patent Document 1, changes in the environment due to movement of the vehicle are not taken into consideration as described above. In particular, no consideration is given to an increase in the amount of partial discharge in a high altitude or high humidity environment. Therefore, there is a problem that the deterioration of the insulation performance cannot be suppressed according to such an environment.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a control device for a moving body that ensures insulation performance according to the amount of partial discharge that occurs.

  A control device for a moving body according to a first aspect of the invention is a control device for a moving body on which an electric motor is mounted. An electric device that supplies electric power to the electric motor is mounted on the moving body. The control device includes a detection unit for detecting a physical quantity corresponding to a partial discharge generated in the electric motor, and a control unit for controlling the electric motor. The control means includes a setting means for setting a voltage value supplied to the electric motor and the electric device according to the detected physical quantity, and a means for controlling the electric motor based on the set voltage value. .

  According to the first aspect of the present invention, the control means includes a physical quantity corresponding to the detected partial discharge (for example, a peak value of a power spectrum in a predetermined frequency band corresponding to the partial discharge of the interphase voltage in a predetermined period. Alternatively, the voltage value supplied to the electric motor and the electric device is set according to the integrated value. The control means controls the electric motor based on the set voltage value. For example, based on the physical quantity corresponding to the detected partial discharge, the voltage value supplied to the electric motor and the electric device so that the partial discharge amount falls within an allowable range that can suppress the deterioration of the insulation performance of the insulator. (For example, by setting the upper limit of the voltage value to be lower than the upper limit of the voltage value before the increase of the partial discharge amount), the mobile object ( For example, when the vehicle moves (runs), an increase in the partial discharge amount can be suppressed even if the dielectric constant of the air increases. Therefore, even if the environment changes due to the movement of the vehicle, it is possible to suppress the deterioration of the insulating performance of the insulator inside the electric motor and the electric device. Therefore, it is possible to provide a control device for a moving body that ensures insulation performance according to the partial discharge amount.

  In the control device for a moving body according to the second invention, in addition to the configuration of the first invention, the setting means lowers the upper limit of the voltage value when the detected physical quantity is larger than a predetermined value. Means for setting as follows.

  According to the second invention, the setting means has a detected physical quantity (for example, a peak value or an integrated value of a power spectrum in a predetermined frequency band corresponding to partial discharge of an interphase voltage in a predetermined period). By setting the upper limit of the voltage value to be lower when it becomes larger than the predetermined value, an increase in the partial discharge amount can be suppressed. Therefore, for example, by setting the upper limit of the voltage value so that the partial discharge amount is within an allowable range in which the promotion of the insulation performance of the insulator can be suppressed, the mobile body ( For example, when the vehicle moves (runs), an increase in the partial discharge amount can be suppressed even if the dielectric constant of the air increases. Therefore, deterioration of the insulation performance of the insulator inside the electric motor and the electric device can be suppressed.

  A moving body control device according to a third aspect of the present invention is a moving body control device on which an electric motor is mounted. The control device includes a detection unit for detecting a physical quantity corresponding to a partial discharge generated in the electric motor, and a control unit for controlling the electric motor. The control means includes setting means for setting a control value related to the control of the electric motor according to the detected physical quantity, and means for controlling the electric motor based on the set control value.

  According to the third invention, the control means sets the detected physical quantity (for example, the peak value or integrated value of the power spectrum in the predetermined frequency band corresponding to the partial discharge of the interphase voltage in the predetermined period). In response, a control value related to the control of the electric motor (for example, a resistance value of a gate resistor provided between the switching element and the drive circuit in the inverter) is set. The control means controls the electric motor based on the set control value. For example, based on the physical quantity corresponding to the detected partial discharge, the control value related to the control of the motor is set so that the partial discharge quantity is within an allowable range that can suppress the deterioration of the insulation performance of the insulator. (For example, by setting the resistance value to be larger than the resistance value of the gate resistance before the increase of the partial discharge amount), the mobile body (for example, the vehicle) in an environment where the atmospheric pressure is low or high ) Moves (runs), an increase in the partial discharge amount can be suppressed even if the dielectric constant of the air increases. Therefore, even if the environment changes due to the movement of the vehicle, it is possible to suppress the deterioration of the insulating performance of the insulator inside the electric motor and the electric device. Therefore, it is possible to provide a control device for a moving body that ensures insulation performance according to the partial discharge amount.

  In the moving body control device according to the fourth aspect of the invention, in addition to the configuration of the third aspect of the invention, the moving body is equipped with an inverter that supplies electric power to the electric motor. The inverter includes a switching element and a drive circuit that opens and closes the switching element. The control value is a resistance value of a gate resistor provided between the switching element and the drive circuit.

  According to the fourth invention, the control value is a resistance value of a gate resistor provided between the switching element and the drive circuit. When the resistance value is set so as to be larger than the resistance value of the gate resistance before the partial discharge amount is increased, the switching voltage rises gradually, so that the peak value of the surge voltage can be reduced. Therefore, even if the dielectric constant of air rises, the increase in the partial discharge amount can be suppressed by reducing the peak value of the surge voltage. Therefore, deterioration of the insulation performance of the insulator inside the electric motor and the electric device can be suppressed.

  In the moving body control device according to the fifth aspect of the invention, in addition to the configuration of the fourth aspect of the invention, the setting means increases the resistance value when the detected physical quantity is greater than a predetermined value. Means for setting.

  According to the fifth invention, the setting means has a detected physical quantity (for example, a peak value or an integrated value of a power spectrum in a predetermined frequency band corresponding to partial discharge of an interphase voltage in a predetermined period). When the value is larger than a predetermined value, the rise of the switching voltage is moderated by setting the resistance value to be large, so that the peak value of the surge voltage can be reduced. Therefore, for example, even if the dielectric constant of the air rises by setting the resistance value so that the partial discharge amount is within an allowable range in which the promotion of deterioration of the insulation performance of the insulator can be suppressed, the partial discharge amount Increase can be suppressed. Therefore, deterioration of the insulation performance of the insulator inside the electric motor and the electric device can be suppressed.

  In the control device for a moving body according to the sixth invention, in addition to the configuration of any one of the first to fifth inventions, the setting means may select either the voltage value or the resistance value according to the state of the motor. Means for setting one of them.

  According to the sixth aspect, the setting means sets one of the voltage value and the resistance value according to the state of the electric motor. For example, when the load required in the electric motor is low, by setting the voltage value of the system voltage supplied to the electric motor and electrical equipment to be low, the insulation performance can be reduced while suppressing the deterioration of the inverter efficiency. Can be secured. On the other hand, when the load required in the motor is a high load, by setting a large resistance value of the gate resistance of the inverter, it is possible to ensure insulation performance while suppressing deterioration of motor performance and efficiency. . Therefore, by setting one of the voltage value and the resistance value, it is possible to control the electric motor according to the required load while suppressing the deterioration of the insulation performance.

  In the mobile body control device according to the seventh invention, in addition to the configuration of any one of the first to sixth inventions, the motor is a three-phase AC synchronous motor. The detecting means detects a power spectrum in a predetermined frequency band corresponding to partial discharge of a voltage for a predetermined period detected as a physical quantity and a means for detecting a voltage between phases of the motor. Means.

  According to the seventh invention, the detecting means detects a voltage between the phases of the motor which is a three-phase AC synchronous motor, and a predetermined frequency corresponding to the partial discharge of the detected voltage in a predetermined period. The power spectrum in the band is detected as a physical quantity. The voltage between the phases includes a voltage fluctuation in a frequency band corresponding to the partial discharge. Therefore, for example, when the detected peak value or integrated value of the power spectrum becomes larger than a predetermined value, the partial discharge amount promotes the deterioration of the insulation performance of the insulator inside the electric motor and the electric device. The amount can be detected. Therefore, by setting the upper limit of the voltage value supplied to the electric motor and the electric device to be low (or to increase the resistance value of the gate resistance) according to the detected power spectrum, the atmospheric pressure is reduced. When a moving body (for example, a vehicle) moves (runs) in a low or high humidity environment, an increase in the amount of partial discharge can be suppressed even if the dielectric constant of air increases. Therefore, deterioration of the insulation performance of the insulator inside the electric motor and the electric device can be suppressed.

  In the moving body control device according to the eighth invention, in addition to the configuration of any one of the first to sixth inventions, the motor is a three-phase AC synchronous motor. The detection means detects a power spectrum in a predetermined frequency band corresponding to the partial discharge of the current in the predetermined period detected as a physical quantity and a means for detecting the current between the phases of the motor. Means.

  According to the eighth invention, the detecting means detects a current between phases of the motor which is a three-phase AC synchronous motor, and a predetermined frequency corresponding to the partial discharge of the detected current in a predetermined period. The power spectrum in the band is detected as a physical quantity. The current between phases includes a current in a frequency band corresponding to partial discharge. Therefore, for example, when the detected peak value or integrated value of the power spectrum becomes larger than a predetermined value, the partial discharge amount promotes the deterioration of the insulation performance of the insulator inside the electric motor and the electric device. The amount can be detected. Therefore, by setting the upper limit of the voltage value supplied to the electric motor and the electric device to be low (or to increase the resistance value of the gate resistance) according to the detected power spectrum, the atmospheric pressure is reduced. When a moving body (for example, a vehicle) moves (runs) in a low or high humidity environment, an increase in the amount of partial discharge can be suppressed even if the dielectric constant of air increases. Therefore, deterioration of the insulation performance of the insulator inside the electric motor and the electric device can be suppressed.

  In the control device for a moving body according to the ninth invention, in addition to the configuration of any one of the first to sixth inventions, the detecting means detects an electromotive force for detecting an electromotive force based on an electromagnetic wave generated in the electric motor. And means for detecting, as a physical quantity, a power spectrum in a predetermined frequency band corresponding to the partial discharge in the predetermined period of the detected electromotive force in the predetermined period.

  According to the ninth invention, the detecting means detects an electromotive force based on an electromagnetic wave generated in the electric motor, and detects the electromotive force of the detected predetermined period in a predetermined frequency band corresponding to the partial discharge. The power spectrum is detected as a physical quantity. Electromagnetic waves generated in the electric motor include electromagnetic waves generated based on partial discharge. That is, the electromotive force based on electromagnetic waves includes an electromotive force in a frequency band corresponding to partial discharge. Therefore, for example, when the detected peak value or integrated value of the power spectrum becomes larger than a predetermined value, the partial discharge amount promotes the deterioration of the insulation performance of the insulator inside the electric motor and the electric device. The amount can be detected. Therefore, by setting the upper limit of the voltage value supplied to the electric motor and the electric device to be low (or to increase the resistance value of the gate resistance) according to the detected power spectrum, the atmospheric pressure is reduced. When a moving body (for example, a vehicle) moves (runs) in a low or high humidity environment, an increase in the amount of partial discharge can be suppressed even if the dielectric constant of air increases. Therefore, deterioration of the insulation performance of the insulator inside the electric motor and the electric device can be suppressed.

  In the mobile body control device according to the tenth invention, in addition to the configuration of the ninth invention, the electromotive force detection means is a loop antenna including a plurality of coils provided around the motor.

  According to the tenth invention, an electromotive force based on an electromagnetic wave generated in the electric motor can be accurately detected by the loop antenna configured by providing a plurality of coils around the electric motor. The electromagnetic wave generated in the electric motor by the loop antenna includes an electromagnetic wave generated based on partial discharge. Therefore, it is possible to accurately detect the electromotive force of the electromagnetic wave based on the partial discharge.

  In the control device for a moving body according to the eleventh invention, in addition to the configuration of any one of the first to sixth inventions, the motor is provided with a resolver that detects the rotation angle of the motor. The detection means includes means for detecting, as a physical quantity, a power spectrum in a predetermined frequency band corresponding to the partial discharge of a detection signal output from the resolver for a predetermined period.

  According to the eleventh aspect of the invention, the detecting means calculates the power spectrum in the predetermined frequency band corresponding to the partial discharge of the detection signal of the predetermined period output from the resolver that detects the rotation angle of the electric motor as a physical quantity. Detect as. An electromotive force in a predetermined frequency band is generated in a coil constituting the resolver by electromagnetic waves generated based on partial discharge from the electric motor. Therefore, for example, when the detected peak value or integrated value of the power spectrum becomes larger than a predetermined value, the partial discharge amount promotes the deterioration of the insulation performance of the insulator inside the electric motor and the electric device. The amount can be detected. Therefore, by setting the upper limit of the voltage value supplied to the electric motor and the electric device to be low (or to increase the resistance value of the gate resistance) according to the detected power spectrum, the atmospheric pressure is reduced. When a moving body (for example, a vehicle) moves (runs) in a low or high humidity environment, an increase in the amount of partial discharge can be suppressed even if the dielectric constant of air increases. Therefore, deterioration of the insulation performance of the insulator inside the electric motor and the electric device can be suppressed.

  In the mobile body control device according to the twelfth invention, in addition to the configuration of any one of the first to sixth inventions, the detection means includes means for detecting the ozone concentration around the electric motor as a physical quantity.

  According to the twelfth invention, the detection means detects the ozone concentration around the electric motor as a physical quantity. When partial discharge occurs in the electric motor, the ozone concentration around the electric motor tends to increase. Therefore, when the detected ozone concentration becomes larger than a predetermined value, it is detected that the partial discharge amount is a partial discharge amount that promotes the deterioration of the insulation performance of the insulator inside the electric motor and the electric device. can do. Therefore, when the detected ozone concentration becomes higher than a predetermined value, the upper limit of the voltage value supplied to the electric motor and the electric device is set to be low (or the resistance value of the gate resistance is set to be high). As a result, when a moving body (for example, a vehicle) moves (runs) in a low atmospheric pressure or high humidity environment, even if the dielectric constant of the air increases, the increase in the partial discharge amount can be suppressed. it can. Therefore, deterioration of the insulation performance of the insulator inside the electric motor and the electric device can be suppressed.

  Hereinafter, a mobile control device according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated. In the present invention, the moving body is not particularly limited as long as the moving body is equipped with an electric motor, and may be, for example, a hybrid vehicle, an electric vehicle, or a fuel cell vehicle. In the present embodiment, the moving body will be described as a hybrid vehicle.

<First Embodiment>
As shown in FIG. 1, a vehicle on which the mobile body control device according to the present embodiment is mounted includes an HV-ECU (Hybrid Vehicle-Electronic Control Unit) 100, a DC / DC converter 400, and a battery 500. Inverter 600 and motor 700 are mounted.

  The battery 500 is not particularly limited as long as it is a rechargeable secondary battery. For example, the battery 500 may be a nickel metal hydride battery or a lithium ion battery.

  DC / DC converter 400 boosts the DC voltage of battery 500. The DC / DC converter 400 controls the boosted voltage according to the control signal received from the HV-ECU 100.

  Inverter 600 converts the DC voltage boosted by DC / DC converter 400 into an AC voltage. Inverter 600 controls an AC voltage supplied to motor 700 in accordance with a control signal received from HV-ECU 100. .

  The motor 700 is an electric motor and is driven based on the AC voltage supplied from the inverter 600. Motor 700 is, for example, a three-phase AC synchronous motor. The motor 700 is connected to driving wheels (not shown) of the vehicle, and generates driving force corresponding to the supplied AC voltage on the driving wheels.

  Here, when the vehicle travels, partial discharge is generated in the internal insulator in accordance with the operation of the DC / DC converter 400, the inverter 600, and the motor 700. This partial discharge amount increases or decreases in response to changes in atmospheric pressure. In other words, as shown in FIG. 2, the relationship between the atmospheric pressure and the partial discharge amount tends to increase as the atmospheric pressure decreases. Further, when the DC voltage supplied to the inverter 600 increases, the partial discharge amount tends to increase. Particularly, the region where the partial discharge amount is C (1) or more is a region where the deterioration of the insulating performance of the internal insulator is promoted. This is because the dielectric constant of air rises in an environment of low atmospheric pressure or high humidity such as a high altitude. Therefore, when the vehicle travels in such an environment, the partial discharge amount may increase, and the insulation performance of the insulators inside the DC / DC converter 400, the inverter 600, and the motor 700 may deteriorate. .

  Therefore, in the present embodiment, HV-ECU 100 sets the voltage value supplied to inverter 600 and motor 700 according to the physical quantity corresponding to the partial discharge generated in motor 700, and the set voltage value Based on the above, the motor 700 is controlled.

  Specifically, the physical quantity corresponding to the partial discharge is detected based on the voltage between the phases of the motor 700. As shown in FIG. 3, the waveform of the voltage between phases when partial discharge occurs in the motor 700 is a waveform in which voltage fluctuation due to partial discharge is superimposed on voltage fluctuation due to switching surge. At this time, the frequency band of voltage fluctuation due to switching surge is from 1 MHz to 10 MHz, whereas the frequency band of voltage fluctuation due to partial discharge is from 10 MHz to 4 GHz.

  As shown in FIG. 4, a voltmeter 102, an FFT (Fast Fourier Transform) circuit 104, and an arithmetic circuit 106 are further mounted on the vehicle on which the vehicle control apparatus according to the present embodiment is mounted. In this embodiment, with these configurations, the power spectrum is calculated from the voltage between the phases, and the integrated value of the power spectrum in the frequency band of 10 MHz or higher is calculated.

  Voltmeter 102 connects the phases of motor 700. Note that the voltmeter 102 may be provided between any one of the three phases of the motor 700. The voltmeter 102 detects the voltage between the phases and outputs a signal corresponding to the detected voltage to the FFT circuit 104.

  The FFT circuit 104 performs Fourier transform on data in a predetermined period among the time-series data of the detection signal input from the voltmeter 102 to calculate a power spectrum. Note that the predetermined period is not particularly limited. In addition, the Fourier transform is not described in detail because a known technique may be used. The FFT circuit 104 outputs the calculated power spectrum to the arithmetic circuit 106. When the time series data of a predetermined period is Fourier transformed by the FFT circuit 104, the relationship between the frequency and the power spectrum is as shown in FIG. In FIG. 5, 5 KHz indicates a carrier frequency.

  The arithmetic circuit 106 integrates power spectra of 10 MHz or higher, which is a frequency band corresponding to partial discharge, from the power spectrum input from the FFT circuit 104. The frequency band to be integrated is not particularly limited as long as it is 10 MHz or more. However, since the frequency band corresponding to partial discharge is from 10 MHz to 4 GHz, the frequency band to be integrated is preferably from 10 MHz to 4 GHz. It is desirable that That is, in the present embodiment, as shown in FIG. 5, no partial discharge is generated from the integrated value of the power spectrum (solid line) when partial discharge is generated in the frequency band from 10 MHz to 4 GHz. In this case, the difference between the integrated values of the power spectrum (broken line) (the area of the hatched portion) is calculated as an integrated value corresponding to the partial discharge generated in the motor 700. The arithmetic circuit 106 outputs the calculated integrated value to the HV-ECU 100.

  In the present embodiment, the FFT circuit 104 and the arithmetic circuit 106 are described as being realized by hardware provided separately from the HV-ECU 100. However, the present invention is not particularly limited to such a configuration. Absent. For example, the FFT circuit 104 and the arithmetic circuit 106 may be realized by hardware provided integrally with the HV-ECU 100, or may be realized by a program (software) executed by the HV-ECU 100. Further, in the present embodiment, “physical quantity corresponding to partial discharge” is an integrated value of a power spectrum in a frequency band corresponding to partial discharge of a voltage between phases in a predetermined period.

  Since the HV-ECU 100 can be said to have increased the partial discharge amount when the integrated value input from the arithmetic circuit 106 is larger than a predetermined value, the upper limit of the voltage value supplied to the inverter 600 and the motor 700 is increased. Is set to be low. In the following description, the upper limit of the voltage value is described as Vmax.

  With reference to FIG. 6, a control structure of a program executed in HV-ECU 100 in the present embodiment will be described.

  In step (hereinafter referred to as “S”) 1000, HV-ECU 100 detects the integrated value of the power spectrum in the frequency band corresponding to the partial discharge. Specifically, the integrated value of the power spectrum corresponding to the partial discharge is input from the arithmetic circuit 106 to the HV-ECU 100. The FFT circuit 104 performs Fourier transform on the detection signal input from the voltmeter 102 for a predetermined period to calculate a power spectrum. The arithmetic circuit 106 calculates the difference between the power spectrum input from the FFT circuit 104 and the integrated value when no partial discharge occurs from the integrated value of the power spectrum from 10 MHz to 4 GHz. The integrated value when the partial discharge has not occurred is a value calculated in advance. The arithmetic circuit 106 inputs the difference calculated as the integrated value corresponding to the partial discharge to the HV-ECU 100.

  In S1100, HV-ECU 100 determines whether or not the integrated value input from arithmetic circuit 106 is smaller than a predetermined value α. The predetermined value α is not particularly limited and is a value adapted experimentally. If it is determined that the integrated value is smaller than predetermined value α (YES in S1100), the process proceeds to S1200. If not (NO in S1100), the process proceeds to S1300.

  In S1200, HV-ECU 100 sets Vmax as an upper limit value. Vmax is not a particularly limited value, but is an upper limit value of a voltage preset as an initial value. In S1300, HV-ECU 100 sets Vmax × β as an upper limit value.

  Β is a value smaller than 1, and when Vmax × β is set as the upper limit value, the partial discharge amount generated in the inverter 600 and the motor 700 suppresses the promotion of the deterioration of the insulating performance of the insulator. The value is not particularly limited as long as the value is within a possible range. In S1500, HV-ECU 100 controls DC / DC converter 400 using the set upper limit value as the maximum value of the boosted voltage.

  The operation of the vehicle control apparatus according to the present embodiment based on the above-described structure and flowchart will be described.

  Of the time-series data of the voltage between the phases of the motor 700 detected by the voltmeter 102, data in a predetermined period is Fourier-transformed in the FFT circuit 104 to calculate a power spectrum. In the arithmetic circuit 106, power spectrum values from 10 MHz to 4 GHz are integrated among the calculated power spectra, and an integrated value corresponding to the partial discharge is calculated from a difference from the integrated value when the partial discharge is not generated. And input to the HV-ECU 100 (S1000).

  If the atmospheric pressure is an atmospheric pressure in a lowland and the integrated value input from arithmetic circuit 106 is smaller than a predetermined value α (YES in S1100), the initial value Vmax is set as the upper limit value. (S1200). Then, the voltage supplied from DC / DC converter 400 to inverter 600 is controlled (S1400). At this time, the DC / DC converter 400 is controlled so as not to exceed the set upper limit value Vmax.

  On the other hand, when the vehicle is traveling in a high humidity environment, or when the vehicle is traveling in a low atmospheric pressure environment, such as when the vehicle is traveling in a highland such as a mountainous area. Increases the dielectric constant of air and increases the amount of partial discharge generated in the motor 700. At this time, if the integrated value input from arithmetic circuit 106 is greater than a predetermined value α (NO in S1100), Vmax × β is set as the upper limit value (S1300). Then, the voltage supplied from DC / DC converter 400 to inverter 600 is controlled (S1400). At this time, the DC / DC converter 400 is controlled so as not to exceed the set upper limit value Vmax × β. Since β is a value smaller than 1, the upper limit value is set to be smaller than in the case where the integrated value is smaller than a predetermined value α. Therefore, an increase in the amount of partial discharge generated in motor 700 is suppressed.

  As described above, according to the vehicle control apparatus of the present embodiment, the interphase voltage detected by the voltmeter is Fourier transformed by the FFT circuit, and the integrated value of the power spectrum corresponding to the partial discharge in the arithmetic circuit. Is calculated. The HV-ECU supplies the motor and the inverter so that the partial discharge amount is within a range in which the deterioration of the insulation performance of the insulator can be suppressed when the calculated integrated value becomes larger than a predetermined value. The upper limit value is set so that the upper limit value of the generated voltage is lower than the upper limit value of the voltage before the partial discharge amount is increased. Thereby, when the vehicle travels in a low atmospheric pressure or high humidity environment, an increase in the partial discharge amount can be suppressed even if the dielectric constant of the air increases. Therefore, even if the environment changes due to the movement of the vehicle, it is possible to suppress the deterioration of the insulation performance of the insulator inside the motor and the inverter. Therefore, it is possible to provide a vehicle control device that ensures insulation performance according to the partial discharge amount.

  In the present embodiment, the integrated value corresponding to the partial discharge is determined based on the difference between the integrated value when the partial discharge is generated and the integrated value when the partial discharge is not generated. Although the value is set, the upper limit value of the voltage may be set based on the integrated value of the power spectrum in the frequency band from 10 MHz to 4 GHz when the partial discharge is generated.

  Further, the calculation of the integrated value may be performed at predetermined time intervals, or may be performed every time when the HV-ECU 100 executes a program for controlling the motor 700, and is particularly limited. is not.

  Furthermore, in the present embodiment, the upper limit value of the voltage is set according to the integrated value of the power spectrum in the frequency band from 10 MHz to 4 GHz, but is not particularly limited to the integrated value. For example, the arithmetic circuit 106 calculates the peak value of the power spectrum in the frequency band from 10 MHZ to 4 GHz among the power spectrum input from the FFT circuit 104, and the HV-ECU 100 determines the peak value as a predetermined value. When the value is larger than the upper limit, the upper limit value of the voltage may be set lower.

  In the present embodiment, HV-ECU 100 sets Vmax × β as the upper limit value of the voltage when the integrated value becomes larger than a predetermined value α. For example, the integrated value and β May be stored in advance, and HV-ECU 100 may calculate β corresponding to the integrated value from the map and set Vmax × β as the upper limit value of the voltage.

<Second Embodiment>
Hereinafter, the vehicle control apparatus according to the second embodiment will be described. The vehicle on which the vehicle control device according to the present embodiment is mounted is different in the configuration of inverter 600 from the configuration of the vehicle on which the vehicle control device according to the first embodiment described above is mounted. The other configuration is the same as the configuration of the vehicle on which the vehicle control device according to the first embodiment described above is mounted. They are given the same reference numerals. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  In the present embodiment, HV-ECU 100 sets a control value related to the control of motor 700 according to a physical quantity corresponding to a partial discharge amount generated in motor 700, and based on the set control value. The feature is that the motor 700 is controlled.

  Specifically, in the present embodiment, inverter 600 includes a switching element 1100 and a gate drive circuit 900 corresponding to each phase of motor 700. In the inverter 600, the switching of the switching element 1100 is controlled by the gate drive circuit 900 corresponding to each phase in accordance with a control signal from the HV-ECU 100, and the DC voltage is converted into an AC voltage. Switching element 1100 is, for example, an IGBT (Insulated Gate Bipolar Transistor).

  As shown in FIG. 7, anti-parallel diode 1000 is connected to switching element 1100 so that a current flows from the emitter side to the collector side. A gate resistor 800 is provided between the gate side of the switching element 1100 and the gate drive circuit 900. A drive signal is output from the gate drive circuit 900 to the switching element 1000 in response to a control signal from the HV-ECU 100, and the switching element 1100 opens and closes in response to the drive signal. By controlling the opening and closing of the switching element 1100 corresponding to each phase, the DC voltage of the DC / DC converter 600 is converted into an AC voltage, and the converted AC voltage is supplied to the motor 700.

  In the present embodiment, the gate resistor 800 is a variable resistor, and the resistance value is variable according to the control signal of the HV-ECU 100. In the present embodiment, the control value is the resistance value of the gate resistor 800, and the HV-ECU 100 determines the gate resistor 800 based on the integrated value of the power spectrum corresponding to the partial discharge input from the arithmetic circuit 106. The resistance value is set, and the gate resistance 800 is controlled so that the set resistance value is obtained.

  Hereinafter, a control structure of a program executed by HV-ECU 100 in the present embodiment will be described with reference to FIG. In the flowchart shown in FIG. 8, the same steps as those in the flowchart shown in FIG. 6 are given the same step numbers. The processing is the same for them. Therefore, detailed description thereof will not be repeated here.

  In S2000, HV-ECU 100 sets Rg as a resistance value. Rg is not a particularly limited value, but is a resistance value of the gate resistor 800 set in advance as an initial value.

  In S2100, HV-ECU 100 sets Rg × γ as a resistance value. Note that γ is a value larger than 1, and when Rg × γ is set as a resistance value, the amount of partial discharge generated in the inverter 600 and the motor 700 can suppress the deterioration of the insulation performance of the insulator. As long as the value falls within the range, the value is not particularly limited. In S2200, HV-ECU 100 controls gate resistance 800 to have a set resistance value.

  The operation of the vehicle control apparatus according to the present embodiment based on the above-described structure and flowchart will be described.

  Of the time-series data of the voltage between the phases of the motor 700 detected by the voltmeter 102, data in a predetermined period is Fourier-transformed in the FFT circuit 104 to calculate a power spectrum. In the arithmetic circuit 106, power spectrum values from 10 MHz to 4 GHz are integrated among the calculated power spectra, and an integrated value corresponding to the partial discharge is calculated from a difference from the integrated value when the partial discharge is not generated. And input to the HV-ECU 100 (S1000).

  If the atmospheric pressure is an atmospheric pressure in a lowland and the integrated value input from the arithmetic circuit 106 is smaller than a predetermined value α (YES in S1100), the initial value Rg is set as the resistance value. (S2000). Then, the resistance value of the gate resistor 800 is controlled to be Rg (S2200).

  On the other hand, when the vehicle is traveling in a high humidity environment or when the vehicle is traveling in an environment where the atmospheric pressure is reduced, such as when the vehicle is traveling in a highland such as a mountainous area. The dielectric constant of air increases, and the amount of partial discharge generated in the motor 700 increases. At this time, if the integrated value input from arithmetic circuit 106 is larger than a predetermined value α (NO in S1100), Rg × γ is set as a resistance value (S2100). Then, the resistance value of the gate resistor 800 is controlled to be Rg × γ (S2200). At this time, since γ is a value larger than 1, the resistance value is set to be larger than that in the case where the integrated value is smaller than a predetermined value α.

  Here, when the resistance value of the gate resistor 800 is controlled, as shown in FIG. 9A, if the gate resistor 800 is set to be small, the surge voltage becomes large, and the emitter-collector is increased. The maximum value of the switching voltage is increased. On the other hand, as shown in FIG. 9B, when the gate resistance 800 is set to be large, the rise of the switching voltage between the emitter and the collector becomes gentle, so that the surge voltage becomes small. When the surge voltage is reduced, the maximum value of the switching voltage is reduced, so that the partial discharge amount generated in the inverter 600 and the motor 700 is suppressed.

  As described above, according to the vehicle control apparatus of the present embodiment, the interphase voltage detected by the voltmeter is Fourier transformed by the FFT circuit, and the integrated value of the power spectrum corresponding to the partial discharge in the arithmetic circuit. Is calculated. When the calculated integrated value becomes larger than a predetermined value, the HV-ECU has a resistance value of the gate resistance so that the partial discharge amount is within a range in which the promotion of deterioration of the insulating performance of the insulator can be suppressed. Is set to be larger than the resistance value before the partial discharge amount is increased. As a result, when the vehicle travels in a low atmospheric pressure or high humidity environment, the surge voltage is reduced even if the dielectric constant of the air is increased, so that an increase in the partial discharge amount can be suppressed. Therefore, even if the environment changes due to the movement of the vehicle, it is possible to suppress the deterioration of the insulation performance of the insulator inside the motor and the inverter. Therefore, it is possible to provide a vehicle control device that ensures insulation performance according to the partial discharge amount.

  In the present embodiment, HV-ECU 100 sets Rg × γ as a resistance value when the integrated value becomes larger than a predetermined value α, but for example, the integrated value and β A map indicating the relationship may be stored in advance, and HV-ECU 100 may calculate γ corresponding to the integrated value from the map and set Rg × γ as the resistance value.

  Preferably, the HV-ECU controls the maximum value of the boost voltage according to the physical quantity corresponding to the partial discharge described in the first embodiment and the present embodiment according to the state of the motor. It is desirable to perform any one of the control of the resistance value of the gate resistance in accordance with the physical quantity corresponding to the partial discharge described in.

  As shown in FIG. 10, the control of the maximum value of the boosted voltage described in the first embodiment described above reduces the maximum value of the boosted voltage, so that the motor performance and efficiency may deteriorate. The deterioration of efficiency can be suppressed. In addition, a DC / DC converter is required to control the boosted voltage.

  On the other hand, the control of the resistance value of the gate resistance described in the present embodiment increases the resistance value of the gate resistance, so that the efficiency of the inverter may be deteriorated, but the deterioration of the motor performance and efficiency can be suppressed. Further, since the resistance value of the gate resistance is controlled, a boosting system such as a DC / DC converter is not necessary.

  Therefore, when the load required for the motor is low under an environment where the atmospheric pressure is low, by setting the maximum value of the boost voltage low, the insulation performance is suppressed while suppressing the deterioration of the inverter efficiency. Can be secured. On the other hand, when the load required in the motor is a high load, by setting a large resistance value of the gate resistance of the inverter, it is possible to ensure insulation performance while suppressing deterioration in motor performance and efficiency. . Therefore, by setting either the voltage value or the resistance value according to the load required for the motor, the motor can be controlled according to the required load while suppressing the deterioration of the insulation performance. can do.

<Third Embodiment>
Hereinafter, the vehicle control apparatus according to the third embodiment will be described. The vehicle on which the vehicle control device according to the present embodiment is mounted has a current instead of the voltmeter 102 as compared with the configuration of the vehicle on which the vehicle control device according to the first embodiment described above is mounted. The difference is that the total 108 and the capacitor 110 are included. Other configurations are the same as the configurations of the vehicle on which the vehicle control device according to the first embodiment described above is mounted. They are given the same reference numerals. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  In the present embodiment, HV-ECU 100 sets the voltage value supplied to inverter 600 and motor 700 according to the physical quantity corresponding to the partial discharge generated in motor 700, and based on the set voltage value. Thus, the motor 700 is controlled.

  As shown in FIG. 11, an ammeter 108, a capacitor 110, an FFT circuit 104, and an arithmetic circuit 106 are mounted on a vehicle on which the vehicle control apparatus according to the present embodiment is mounted.

  Ammeter 108 is provided to connect the phases of motor 700. The ammeter 108 is connected in series with the capacitor 110. The ammeter 108 may be provided between any one of the three phases of the motor 700. The ammeter 108 detects a current between phases of the motor 700 and outputs a detection signal corresponding to the detected current to the FFT circuit 104.

  At this time, when partial discharge occurs in the motor 700, as shown in FIG. 12, the current due to partial discharge in the frequency band of 10 MHz to 4 GHz is superimposed on the waveform of the current detected by the ammeter 108. Therefore, in the present embodiment, the power spectrum is calculated from the current between phases detected by the ammeter 108 by the FFT circuit 104 and the arithmetic circuit 106, and the integrated value of the power spectrum in the frequency band of 10 MHz or more is calculated. .

  The FFT circuit 104 performs Fourier transform on data in a predetermined period among the time-series data of the detection signal input from the ammeter 108 to calculate a power spectrum. Note that the predetermined period is not particularly limited. In addition, the Fourier transform is not described in detail because a known technique may be used. The FFT circuit 104 outputs the calculated power spectrum to the arithmetic circuit 106.

  The arithmetic circuit 106 integrates power spectra of 10 MHz or higher, which is a frequency band corresponding to partial discharge, in the power spectrum input from the FFT circuit 104. The frequency band to be integrated is not particularly limited as long as it is 10 MHz or more. However, since the frequency band corresponding to partial discharge is from 10 MHz to 4 GHz, the frequency band to be integrated is preferably from 10 MHz to 4 GHz. It is desirable that The arithmetic circuit 106 outputs the calculated integrated value to the HV-ECU 100. In the present embodiment, “physical quantity corresponding to partial discharge” is an integrated value of a power spectrum in a frequency band corresponding to partial discharge of a current between phases in a predetermined period.

  Since the HV-ECU 100 can be said to have increased the partial discharge amount when the integrated value input from the arithmetic circuit 106 is larger than a predetermined value, the upper limit of the voltage value supplied to the inverter 600 and the motor 700 is increased. Set to lower.

  In the present embodiment, the control structure of the program executed by HV-ECU 100 is the same as the flowchart of FIG. 6 described in the first embodiment. Therefore, detailed description thereof will not be repeated.

  The operation of the vehicle control apparatus according to the present embodiment based on the above-described structure and flowchart will be described.

  Of the time-series data of the current between the phases of the motor 700 detected by the ammeter 108, data in a predetermined period is Fourier-transformed in the FFT circuit 104 to calculate a power spectrum. In the arithmetic circuit 106, power spectra from 10 MHz to 4 GHz among the calculated power spectra are integrated, and an integrated value corresponding to the partial discharge is calculated from a difference from the integrated value when the partial discharge is not generated, It is input to the HV-ECU 100 (S1000).

  If the atmospheric pressure is an atmospheric pressure in a lowland and the integrated value input from arithmetic circuit 106 is smaller than a predetermined value α (YES in S1100), the initial value Vmax is set as the upper limit value. (S1200). Then, the voltage supplied from DC / DC converter 400 to inverter 600 is controlled (S1400). At this time, the DC / DC converter 400 is controlled so as not to exceed the set upper limit value Vmax.

  On the other hand, when the vehicle is traveling in a high humidity environment, or when the vehicle is traveling in a low atmospheric pressure environment, such as when the vehicle is traveling in a highland such as a mountainous area. As the dielectric constant of air rises, the amount of partial discharge generated in the motor 700 increases. At this time, if the integrated value input from arithmetic circuit 106 is greater than a predetermined value α (NO in S1100), Vmax × β is set as the upper limit value (S1300). Then, the voltage supplied from DC / DC converter 400 to inverter 600 is controlled (S1400). At this time, the DC / DC converter 400 is controlled so as not to exceed the set upper limit value Vmax × β. Since β is a value smaller than 1, the upper limit value is set to be smaller than when the integrated value is smaller than a predetermined value α. Therefore, an increase in the amount of partial discharge generated in motor 700 is suppressed.

  As described above, according to the vehicle control apparatus of the present embodiment, the same effects as those of the first embodiment described above can be obtained. In the present embodiment, the increase in the partial discharge amount is suppressed by limiting the upper limit value of the boosted voltage. However, as described in the second embodiment, the integrated value is a predetermined value. If the value is larger than α, the resistance value of the gate resistance included in the inverter 600 may be set so as to increase, thereby suppressing the increase in the partial discharge amount.

  Alternatively, the partial discharge amount may be measured using frequency characteristics having different resistance values depending on the frequency band of the current flowing through the capacitor. That is, the partial discharge amount may be detected by an ammeter by using a capacitor having a frequency characteristic in which a resistance value is low with respect to a current in a frequency band corresponding to the partial discharge. In this case, the FFT circuit 104 can be omitted.

  Alternatively, a current value in a frequency band (10 MHz or higher or 10 MHz to 4 GHz) corresponding to partial discharge is extracted using a known high-pass filter or band-pass filter instead of the FFT circuit, and the partial discharge amount is measured by an ammeter. You may make it detect by.

<Fourth embodiment>
A vehicle control apparatus according to the fourth embodiment will be described below. The vehicle on which the vehicle control device according to the present embodiment is mounted is a loop instead of the voltmeter 102 as compared with the configuration of the vehicle on which the vehicle control device according to the first embodiment described above is mounted. The difference is that the antenna 112 and the amplifier 114 are included. Other configurations are the same as the configurations of the vehicle on which the vehicle control device according to the first embodiment described above is mounted. They are given the same reference numerals. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  In the present embodiment, HV-ECU 100 sets the voltage value supplied to inverter 600 and motor 700 according to the physical quantity corresponding to the partial discharge generated in motor 700, and based on the set voltage value. Thus, the motor 700 is controlled.

  As shown in FIG. 13, a loop antenna 112, an amplifier 113, an FFT circuit 104, and an arithmetic circuit 106 are mounted on a vehicle on which the vehicle control device according to the present embodiment is mounted.

  Loop antenna 112 detects electromagnetic waves generated in motor 700. In the present embodiment, the loop antenna 112 is configured by connecting a plurality of coils in parallel as shown in FIG. The loop antenna 112 may be configured with one coil. The loop antenna 112 is wound around a coil end 702 of the motor 700 as shown in FIGS. In this way, the loop antenna 112 detects an electromotive force based on an electromagnetic wave generated in the motor 700. The electromotive force detected by the loop antenna 112 is amplified by the amplifier 114 and then output to the FFT circuit 104.

  At this time, when a partial discharge occurs in the motor 700, the electromagnetic wave emitted from the motor 700 includes an electromagnetic wave based on a partial discharge in a frequency band of 10 MHz to 4 GHz. Therefore, in this embodiment, the power spectrum of the electromotive force detected by the loop antenna 112 and amplified by the amplifier 114 is calculated by the FFT circuit 104 and the arithmetic circuit 106, and the power spectrum of the frequency band of 10 MHz or more is calculated. Calculate the integrated value.

  The FFT circuit 104 performs Fourier transform on data of a predetermined period among time series data of electromotive force input from the amplifier 114, and calculates a power spectrum. Note that the predetermined period is not particularly limited. In addition, the Fourier transform is not described in detail because a known technique may be used. The FFT circuit 104 outputs the calculated power spectrum to the arithmetic circuit 106.

  The arithmetic circuit 106 integrates power spectra of 10 MHz or higher, which is a frequency band corresponding to partial discharge, in the power spectrum input from the FFT circuit 104. The frequency band to be integrated is not particularly limited as long as it is 10 MHz or more. However, since the frequency band corresponding to partial discharge is from 10 MHz to 4 GHz, the frequency band to be integrated is preferably from 10 MHz to 4 GHz. It is desirable that The arithmetic circuit 106 outputs the calculated integrated value to the HV-ECU 100. In the present embodiment, “physical quantity corresponding to partial discharge” is an integrated value of the power spectrum in the frequency band corresponding to partial discharge of the electromotive force detected by loop antenna 112 in a predetermined period. .

  Since the HV-ECU 100 can be said to have increased the partial discharge amount when the integrated value input from the arithmetic circuit 106 is larger than a predetermined value, the upper limit of the voltage value supplied to the inverter 600 and the motor 700 is increased. Is set to be low.

  In the present embodiment, the control structure of the program executed by HV-ECU 100 is the same as the flowchart of FIG. 6 described in the first embodiment. Therefore, detailed description thereof will not be repeated.

  The operation of the vehicle control apparatus according to the present embodiment based on the above-described structure and flowchart will be described.

  Of the time series data of electromotive force detected by the loop antenna 112 and amplified by the amplifier 114, data in a predetermined period is Fourier-transformed by the FFT circuit 104 to calculate a power spectrum. In the arithmetic circuit 106, power spectra from 10 MHz to 4 GHz among the calculated power spectra are integrated, and an integrated value corresponding to the partial discharge is calculated from a difference from the integrated value when the partial discharge is not generated, It is input to the HV-ECU 100 (S1000).

  If the atmospheric pressure is an atmospheric pressure in a lowland and the integrated value input from arithmetic circuit 106 is smaller than a predetermined value α (YES in S1100), the initial value Vmax is set as the upper limit value. (S1200). Then, the voltage supplied from DC / DC converter 400 to inverter 600 is controlled (S1400). At this time, the DC / DC converter 400 is controlled so as not to exceed the set upper limit value Vmax.

  On the other hand, when the vehicle is traveling in a high humidity environment, or when the vehicle is traveling in a low atmospheric pressure environment, such as when the vehicle is traveling in a highland such as a mountainous area. As the dielectric constant of air rises, the amount of partial discharge generated in the motor 700 increases. At this time, if the integrated value input from arithmetic circuit 106 is greater than a predetermined value α (NO in S1100), Vmax × β is set as the upper limit value (S1300). Then, the voltage supplied from DC / DC converter 400 to inverter 600 is controlled (S1400). At this time, the DC / DC converter 400 is controlled so as not to exceed the set upper limit value Vmax × β. Since β is a value smaller than 1, the upper limit value is set to be smaller than when the integrated value is smaller than a predetermined value α. Therefore, an increase in the amount of partial discharge generated in motor 700 is suppressed.

  As described above, according to the vehicle control apparatus of the present embodiment, in addition to the effects of the first embodiment described above, the loop antenna is wound around the entire circumference of the coil end of the motor. It is possible to accurately detect the electromagnetic waves generated in. Therefore, minute voltage and current fluctuations due to partial discharge can be accurately detected. Thereby, the increase in the partial discharge amount can be suppressed with high accuracy.

  In the present embodiment, the increase in the partial discharge amount is suppressed by limiting the upper limit value of the boosted voltage. However, as described in the second embodiment, the integrated value is a predetermined value. If the value is larger than α, the resistance value of the gate resistance included in the inverter 600 may be set so as to increase, thereby suppressing the increase in the partial discharge amount.

<Fifth embodiment>
Hereinafter, a vehicle control apparatus according to a fifth embodiment will be described. The vehicle on which the vehicle control device according to the present embodiment is mounted has a resolver instead of the voltmeter 102 as compared with the configuration of the vehicle on which the vehicle control device according to the first embodiment described above is mounted. The difference is that the stator coil 118 is included. Other configurations are the same as the configurations of the vehicle on which the vehicle control device according to the first embodiment described above is mounted. They are given the same reference numerals. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  In the present embodiment, HV-ECU 100 sets the voltage value supplied to inverter 600 and motor 700 according to the physical quantity corresponding to the partial discharge generated in motor 700, and based on the set voltage value. Thus, the motor 700 is controlled.

  As shown in FIG. 16, a coil 118 of a resolver stator (not shown), an FFT circuit 104, and an arithmetic circuit 106 are mounted on a vehicle on which the vehicle control device according to the present embodiment is mounted. .

  A resolver (not shown) for detecting the rotation angle of the motor 700 is fixed to a ring-shaped resolver stator fixed to the stator of the motor 700 and a rotor of the motor 700, and faces the resolver stator from the inside of the ring of the resolver stator. And a resolver rotor (not shown). In the present embodiment, the resolver stator is composed of three coils, and any two of the three coils are provided at positions having an angle of 90 degrees toward the inside of the resolver stator. When an alternating current is supplied to the other coil, the two coils generate outputs corresponding to the gap length with the resolver rotor. Based on the output phase difference, the rotational angle of the motor 700 is detected. A detection signal corresponding to the rotation angle output from the resolver is transmitted to the HV-ECU 100 via an RD converter (not shown).

  At this time, when a partial discharge occurs in the motor 700, the detection signal from the coil 118 includes an electromagnetic wave corresponding to the partial discharge. That is, an electromotive force is generated in the resolver coil 118 based on electromagnetic waves based on partial discharge in a frequency band from 10 MHz to 4 GHz. Therefore, in the present embodiment, the power spectrum of the electromotive force generated in the resolver coil 118 is calculated by the FFT circuit 104 and the arithmetic circuit 106, and the integrated value of the power spectrum in the frequency band of 10 MHz or higher is calculated.

  The FFT circuit 104 is connected in parallel to the coil 118 and calculates a power spectrum by Fourier-transforming data of a predetermined period among time series data of electromotive force input from the coil 118. Note that the predetermined period is not particularly limited. The Fourier transform is not described in detail because a known technique may be used. The FFT circuit 104 outputs the calculated power spectrum to the arithmetic circuit 106.

  The arithmetic circuit 106 integrates power spectra of 10 MHz or higher, which is a frequency band corresponding to partial discharge, in the power spectrum input from the FFT circuit 104. The frequency band to be integrated is not particularly limited as long as it is 10 MHz or more. However, since the frequency band corresponding to partial discharge is from 10 MHz to 4 GHz, the frequency band to be integrated is preferably from 10 MHz to 4 GHz. It is desirable that The arithmetic circuit 106 outputs the calculated integrated value to the HV-ECU 100. In the present embodiment, “physical quantity corresponding to partial discharge” is an integrated value of a power spectrum in a frequency band corresponding to partial discharge of a detection signal (electromotive force) of coil 118 in a predetermined period. .

  In the present embodiment, the control structure of the program executed by HV-ECU 100 is the same as the flowchart of FIG. 6 described in the first embodiment. Therefore, detailed description thereof will not be repeated.

  The operation of the vehicle control apparatus according to the present embodiment based on the above-described structure and flowchart will be described.

  Of the time series data of electromotive force generated in the coil 118 of the resolver stator, data in a predetermined period is Fourier transformed in the FFT circuit 104 to calculate a power spectrum. In the arithmetic circuit 106, power spectra from 10 MHz to 4 GHz among the calculated power spectra are integrated, and an integrated value corresponding to the partial discharge is calculated from a difference from the integrated value when the partial discharge is not generated, It is input to the HV-ECU 100 (S1000).

  If the atmospheric pressure is an atmospheric pressure in a lowland and the integrated value input from arithmetic circuit 106 is smaller than a predetermined value α (YES in S1100), the initial value Vmax is set as the upper limit value. (S1200). Then, the voltage supplied from DC / DC converter 400 to inverter 600 is controlled (S1400). At this time, the DC / DC converter 400 is controlled so as not to exceed the set upper limit value Vmax.

  On the other hand, when the vehicle is traveling in a high humidity environment, or when the vehicle is traveling in a low atmospheric pressure environment, such as when the vehicle is traveling in a highland such as a mountainous area. As the dielectric constant of air rises, the amount of partial discharge generated in the motor 700 increases. At this time, if the integrated value input from arithmetic circuit 106 is greater than a predetermined value α (NO in S1100), Vmax × β is set as the upper limit value (S1300). Then, the voltage supplied from DC / DC converter 400 to inverter 600 is controlled (S1400). At this time, the DC / DC converter 400 is controlled so as not to exceed the set upper limit value Vmax × β. Since β is a value smaller than 1, the upper limit value is set to be smaller than when the integrated value is smaller than a predetermined value α. Therefore, an increase in the partial discharge amount is suppressed.

  As described above, according to the vehicle control apparatus of the present embodiment, in addition to the effects of the first embodiment described above, it is not necessary to separately provide a coil for detecting electromagnetic waves generated in the motor. An increase in cost can be suppressed. In the present embodiment, the increase in the partial discharge amount is suppressed by limiting the upper limit value of the boost voltage. However, as described in the second embodiment, the integrated value is a predetermined value. When the value is larger than α, the resistance value of the gate resistance included in the inverter 600 may be set to be increased so as to suppress the increase in the partial discharge amount.

<Sixth Embodiment>
Hereinafter, a vehicle control device according to a sixth embodiment will be described. The vehicle on which the vehicle control device according to the present embodiment is mounted has a voltmeter 102, an FFT circuit 104, and a vehicle configuration that includes the vehicle control device according to the first embodiment described above. Instead of the arithmetic circuit 106, an ozone probe 120 and an ozone meter 122 are included. Other configurations are the same as the configurations of the vehicle on which the vehicle control device according to the first embodiment described above is mounted. They are given the same reference numerals. Their functions are the same. Therefore, detailed description thereof will not be repeated here.

  In the present embodiment, HV-ECU 100 sets the voltage value supplied to inverter 600 and motor 700 according to the physical quantity corresponding to the partial discharge generated in motor 700, and based on the set voltage value. Thus, the motor 700 is controlled.

  As shown in FIG. 17, an ozone probe 120 and an ozone meter 122 are mounted on a vehicle on which the vehicle control apparatus according to the present embodiment is mounted.

  The ozone probe 120 is provided around the motor 700 and collects gas around the motor 700. The ozone meter 122 detects the concentration of ozone contained in the gas based on the collected gas. A detection signal corresponding to the detected ozone concentration is transmitted to the HV-ECU 100.

  At this time, when partial discharge occurs in the motor 700, the ozone concentration around the motor 700 tends to increase. Therefore, in the present embodiment, when the HV-ECU 100 has an ozone concentration detected by the ozone meter 122 larger than a predetermined value, the upper limit value of the voltage supplied to the inverter 600 and the motor 700 is lowered. Set as follows.

  With reference to FIG. 18, a control structure of a program executed in HV-ECU 100 which is the control apparatus according to the present embodiment will be described. In the flowchart shown in FIG. 18, the same steps as those in the flowchart shown in FIG. The processing is the same for them. Therefore, detailed description thereof will not be repeated here.

  In S3000, HV-ECU 100 detects the ozone concentration of the gas collected by ozone probe 120 using ozone meter 122. In S3100, HV-ECU 100 determines whether or not the detected ozone concentration is smaller than a predetermined value δ. Note that δ is not a particularly limited value and is a value that is experimentally adapted. If it is determined that the detected ozone concentration is smaller than predetermined value δ (YES in S3100), the process proceeds to S1200. If not (NO in S3100), the process proceeds to S1300.

  The operation of the vehicle control apparatus according to the present embodiment based on the above-described structure and flowchart will be described.

  If the ozone concentration around the motor 700 is detected by the ozone meter 122 (S3000) and the atmospheric pressure is the atmospheric pressure in the lowland, and the detected ozone concentration is smaller than the predetermined value δ (YES in S3100) The initial value Vmax is set as the upper limit value (S1200). Then, the voltage supplied from DC / DC converter 400 to inverter 600 is controlled (S1400). At this time, the DC / DC converter 400 is controlled so as not to exceed the set upper limit value Vmax.

  On the other hand, when the vehicle is traveling in a high humidity environment, or when the vehicle is traveling in a low atmospheric pressure environment, such as when the vehicle is traveling in a highland such as a mountainous area. As the air rises, the amount of partial discharge generated in the motor 700 increases. Therefore, the ozone concentration around the motor 700 increases. At this time, if the detected ozone concentration becomes larger than a predetermined value δ (NO in S3100), Vmax × β is set as the upper limit value (S1300). Then, the voltage supplied from DC / DC converter 400 to inverter 600 is controlled (S1400). At this time, the DC / DC converter 400 is controlled so as not to exceed the set upper limit value Vmax × β. Since β is a value smaller than 1, the upper limit value is set to be smaller than when the ozone concentration is smaller than a predetermined value δ. Therefore, an increase in the partial discharge amount is suppressed.

  As described above, according to the vehicle control apparatus of the present embodiment, the same effects as those of the first embodiment described above can be obtained. Further, in the present embodiment, the increase in the partial discharge amount is suppressed by limiting the upper limit value of the boost voltage. However, as described in the second embodiment, the ozone concentration is a predetermined value. When it becomes larger than δ, the resistance value of the gate resistance included in the inverter 600 may be set to be increased so as to suppress the increase in the partial discharge amount.

  In the present embodiment, HV-ECU 100 sets Vmax × β as the upper limit value of the voltage when the ozone concentration becomes greater than a predetermined value δ. May be stored in advance, and HV-ECU 110 may calculate β corresponding to the ozone concentration from the map and set Vmax × β as the upper limit value of the voltage. Furthermore, the HV-ECU 100 may correct the predetermined value δ based on the atmospheric pressure around the vehicle.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the structure of the vehicle by which the control apparatus of the vehicle which concerns on 1st Embodiment is mounted. It is a figure which shows the relationship between atmospheric pressure and the partial discharge amount. It is a timing chart which shows the change of the voltage between phases in a motor. It is a figure which shows the structure of the control apparatus of the vehicle which concerns on 1st Embodiment. It is a figure which shows the relationship between the frequency in the interphase voltage of a motor, and a power spectrum. It is a flowchart which shows the control structure of the program performed by HV-ECU in 1st Embodiment. It is a figure which shows a part of structure of the inverter in 2nd Embodiment. It is a flowchart which shows the control structure of the program performed by HV-ECU in 2nd Embodiment. It is a timing chart which shows the change of the switching voltage between the emitter-collector of a switching element. It is a figure which shows the relationship between the change of a voltage value and resistance value, motor efficiency, inverter efficiency, and cost. It is a figure which shows the structure of the control apparatus of the vehicle which concerns on 3rd Embodiment. It is a timing chart which shows the change of the electric current between the phases in a motor. It is a figure which shows the structure of the control apparatus of the vehicle which concerns on 4th Embodiment. It is a figure which shows the external appearance of a loop antenna. It is a figure which shows the loop antenna wound around the coil end. It is a figure which shows the structure of the control apparatus of the vehicle which concerns on 5th Embodiment. It is a figure which shows the structure of the control apparatus of the vehicle which concerns on 6th Embodiment. It is a flowchart which shows the control structure of the program performed by HV-ECU in 6th Embodiment.

Explanation of symbols

  100 HV-ECU, 102 voltmeter, 104 FFT circuit, 106 arithmetic circuit, 108 ammeter, 110 capacitor, 112 loop antenna, 114 amplifier, 116, 118 coil, 120 ozone probe, 122 ozone meter, 400 DC / DC converter, 500 battery, 600 inverter, 700 motor, 702 coil end, 800 gate resistance, 900 gate drive circuit, 1000 diode, 1100 switching element.

Claims (12)

A control device for a mobile unit equipped with an electric motor, wherein the mobile unit is equipped with an electric device for supplying electric power to the motor,
Detecting means for detecting a physical quantity corresponding to a partial discharge generated in the electric motor;
Control means for controlling the electric motor,
The control means includes
Setting means for setting a voltage value to be supplied to the electric motor and the electric device according to the detected physical quantity;
And a means for controlling the electric motor based on the set voltage value.   The control device for a moving body according to claim 1, wherein the setting means includes means for setting the upper limit of the voltage value to be lower when the detected physical quantity becomes larger than a predetermined value. . A control device for a moving body equipped with an electric motor,
Detecting means for detecting a physical quantity corresponding to a partial discharge generated in the electric motor;
Control means for controlling the electric motor,
The control means includes
A setting means for setting a control value related to the control of the electric motor according to the detected physical quantity;
And a means for controlling the electric motor based on the set control value. The moving body is equipped with an inverter that supplies electric power to the electric motor, and the inverter includes a switching element and a drive circuit that opens and closes the switching element.
The said control value is a control apparatus of the moving body of Claim 3 which is a resistance value of the gate resistance provided between the said switching element and the said drive circuit.   The said setting means is a control apparatus of the moving body of Claim 4 containing a means for setting so that the said resistance value may become large, when the said detected physical quantity becomes larger than a predetermined value.   The said setting means contains the means for setting any one of the said voltage value and the said resistance value according to the state of the said motor, The moving body in any one of Claims 1-5 Control device. The motor is a three-phase AC synchronous motor,
The detection means includes
Means for detecting the voltage between the phases of the motor;
A means for detecting a power spectrum in a predetermined frequency band corresponding to the partial discharge of the voltage of the detected predetermined period as the physical quantity. The control apparatus of the moving body as described in 2. The motor is a three-phase AC synchronous motor,
The detection means includes
Means for detecting the current between the phases of the motor;
A means for detecting a power spectrum in a predetermined frequency band corresponding to the partial discharge of the detected current during a predetermined period as the physical quantity. The control apparatus of the moving body as described in 2. The detection means includes
An electromotive force detection means for detecting an electromotive force based on electromagnetic waves generated in the electric motor;
And means for detecting, as the physical quantity, a power spectrum in a predetermined frequency band corresponding to the partial discharge of the detected electromotive force in a predetermined period. The control apparatus of the moving body of crab.   The mobile body control device according to claim 9, wherein the electromotive force detection means is a loop antenna including a plurality of coils provided around the electric motor. The electric motor is provided with a resolver that detects a rotation angle of the electric motor,
The detection means includes
Means for detecting, as the physical quantity, a power spectrum in a predetermined frequency band corresponding to the partial discharge of a detection signal output from the resolver for a predetermined period. The control apparatus of the moving body in any one of.   The said detection means is a control apparatus of the moving body in any one of Claims 1-6 containing the means for detecting the ozone concentration around the said electric motor as said physical quantity.

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