Vehicle control apparatus
A vehicle control apparatus is provided with: a modulator configured to generate modulation signals; a first corrector configured to perform a first correction process in which a center value of the modulation signals is corrected to reduce a loss in the inverter; a second corrector configured to perform a second correction process in which an amplitude shift and a phase shift of the third harmonic signal with respect to the voltage command signals are reduced; and a controller configured (i) to control the first corrector to perform the first correction process if the DC voltage is greater than or equal to first predetermined voltage and (ii) to control the second corrector to perform the second correction process if the DC voltage is less than the first predetermined voltage, when a number of revolutions of the AC motor is less than a predetermined number of revolutions.
1. A vehicle control apparatus configured to control a vehicle, which includes an alternating current (AC) motor as a power source and an inverter configured to convert direct current (DC) voltage to AC voltage and supply the AC voltage to the AC motor, said vehicle control apparatus comprising:
a modulator configured to generate modulation signals by superimposing a third harmonic signal on voltage command signals for controlling voltage of the inverter;
a first corrector configured to perform a first correction process in which a center value of the modulation signals is corrected to reduce a loss in the inverter;
a second corrector configured to perform a second correction process in which an amplitude shift and a phase shift of the third harmonic signal with respect to the voltage command signals are reduced if a modulation factor of each of the modulation signals is greater than or equal to a predetermined value; and
a controller configured (i) to control said first corrector to perform the first correction process if the DC voltage is greater than or equal to first predetermined voltage and (ii) to control said second corrector to perform the second correction process if the DC voltage is less than the first predetermined voltage, when a number of revolutions of the AC motor is less than a predetermined number of revolutions.
2. The vehicle control apparatus according to claim 1 , wherein said controller is configured to control the said first corrector to perform the first correction process regardless of whether or not the DC voltage is greater than or equal to the first predetermined voltage, if temperature of coolant of the inverter or temperature of elements included in the inverter is greater than or equal to first predetermined temperature.
3. A vehicle control apparatus configured to control a vehicle, which includes an alternating current (AC) motor as a power source and an inverter configured to convert direct current (DC) voltage to AC voltage and supply the AC voltage to the AC motor, said vehicle control apparatus comprising:
a modulator configured to generate modulation signals by superimposing a third harmonic signal on voltage command signals for controlling voltage of the inverter;
a first corrector configured to perform a first correction process in which a center value of the modulation signals is corrected to reduce a loss in the inverter;
a second corrector configured to perform a second correction process in which an amplitude shift and a phase shift of the third harmonic signal with respect to the voltage command signals are reduced if a modulation factor of each of the modulation signals is greater than or equal to a predetermined value; and
a controller configured (i) to control said first corrector to perform the first correction process if temperature of coolant of the inverter or temperature of elements included in the inverter is greater than or equal to second predetermined temperature and (ii) to control said second corrector to perform the second correction process if the temperature of the coolant of the inverter or the temperature of the elements included in the inverter is less than the second predetermined temperature, when a number of revolutions of the AC motor is less than a predetermined number of revolutions.
4. The vehicle control apparatus according to claim 3 , wherein said controller is configured to control the said first corrector to perform the first correction process while the DC voltage is maintained to be greater than or equal to second predetermined voltage, if the temperature of the coolant of the inverter or the temperature of the elements included in the inverter is greater than or equal to the second predetermined temperature.