Control apparatus for an electric vehicle
First Claim
1. A control apparatus for an electric vehicle having a three-phase AC motor for driving said vehicle, three current sensors, each of said current sensors detecting a current of a respective phase in said three-phase AC motor, and a revolution speed detector for detecting the speed of the three-phase AC motor, said control apparatus comprising:
- a motor control unit for controlling the three-phase AC motor, which the motor control unit includes a current demand generating unit for generating current demands based on a revolution speed detected by said revolution speed detector, a current control unit for performing a feedback control based on said current demands and currents detected by said current sensors, and a PWM signal generating unit for generating PWM signals;
an inverter responsive to said PWM signals for feeding currents to said three-phase AC motor;
anomaly detection means for detecting an anomaly in the currents detected by said current sensors by checking whether a monitoring index, obtained by processing three values of said detected currents, exceeds a preset threshold level, and outputting a current anomaly indicating signal, if an anomaly is detected; and
anomaly diagnosis means for inputting diagnostic currents to said three-phase AC motor via said inverter in said response to said current anomaly indicating signal and identifying an anomalous current sensor out of said three current sensors, based on detection results of said diagnostic currents detected from said three current sensors,wherein a motor control corresponding to one of a presence and a non-presence of an anomaly in said detected three current sensors is executed.
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Abstract
A control apparatus for an electric vehicle has an inverter for feeding currents to a three-phase AC motor corresponding to applied PWM signals, three current sensors, each of the sensors detecting a current of a respective phase in the three-phase AC motor, a revolution speed detector for detecting the speed of the three-phase AC motor, a motor control unit for controlling the three-phase AC motor which includes a current demand generating unit, a current control unit for performing feedback control based on the current demands and currents detected by the current sensors, and a PWM signal generating unit. To detect anomalies in the current sensors or the motor control circuit, there is also provided an anomaly detection unit for detecting an anomaly in the detected currents by checking whether monitoring index obtained by processing three values of the detected currents exceeds a preset threshold level and for outputting a current anomaly indicating signal, and an anomaly specifying unit for inputting diagnostic currents to the three-phase AC motor by judging the current anomaly indicating signal and identifying an anomalous current sensor among the three current sensors based on detection results of the diagnostic currents detected by the three current sensors. The control apparatus executes a motor control corresponding to one of a presence and a non-presence of an anomaly in the three current sensors.
52 Citations
7 Claims
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1. A control apparatus for an electric vehicle having a three-phase AC motor for driving said vehicle, three current sensors, each of said current sensors detecting a current of a respective phase in said three-phase AC motor, and a revolution speed detector for detecting the speed of the three-phase AC motor, said control apparatus comprising:
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a motor control unit for controlling the three-phase AC motor, which the motor control unit includes a current demand generating unit for generating current demands based on a revolution speed detected by said revolution speed detector, a current control unit for performing a feedback control based on said current demands and currents detected by said current sensors, and a PWM signal generating unit for generating PWM signals; an inverter responsive to said PWM signals for feeding currents to said three-phase AC motor; anomaly detection means for detecting an anomaly in the currents detected by said current sensors by checking whether a monitoring index, obtained by processing three values of said detected currents, exceeds a preset threshold level, and outputting a current anomaly indicating signal, if an anomaly is detected; and anomaly diagnosis means for inputting diagnostic currents to said three-phase AC motor via said inverter in said response to said current anomaly indicating signal and identifying an anomalous current sensor out of said three current sensors, based on detection results of said diagnostic currents detected from said three current sensors, wherein a motor control corresponding to one of a presence and a non-presence of an anomaly in said detected three current sensors is executed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification