Abnormality detection apparatus and abnormality detection method
An abnormality detection apparatus configured to detect an abnormality of an inverter provided to control a motor generator when a value obtained by performing a predetermined process for a current value representing electric current flowing between an arm included in the inverter and the motor generator is greater than a threshold value, wherein when a reverse voltage by the motor generator is higher than a system voltage, the threshold value is larger than a value obtained by performing the predetermined process for electric current generated by the reverse voltage.
1. An abnormality detection apparatus configured to detect an abnormality of an inverter provided to control a motor generator and to set switching elements included in the inverter ON when a value obtained by performing a smoothing process for an absolute value of a current value representing electric current flowing between an arm included in the inverter and the motor generator is greater than a first threshold value or a second threshold value, wherein:
when a reverse voltage of the motor generator is smaller than a system voltage, the abnormality detection apparatus uses the first threshold value to detect the abnormality;
when the reverse voltage of the motor generator is larger than the system voltage, the abnormality detection apparatus uses the second threshold value to detect the abnormality;
the second threshold value is larger than a value obtained by performing the smoothing process for electric current generated by the reverse voltage; and
the first threshold value is smaller than the second threshold value.
2. An abnormality detection method comprising detecting an abnormality of an inverter provided to control a motor generator and setting switching elements included in the inverter ON when a value obtained by performing a smoothing process for an absolute value of a current value representing electric current flowing between an arm included in the inverter and the motor generator is greater than a first threshold value or a second threshold value, wherein:
when a reverse voltage of the motor generator is smaller than a system voltage, the first threshold value is used to detect the abnormality;
when the reverse voltage of the motor generator is larger than the system voltage, the second threshold value is used to detect the abnormality;
the second threshold value is larger than a value obtained by performing the smoothing process for electric current generated by the reverse voltage; and
the first threshold value is smaller than the second threshold value.