Control apparatus for electric vehicle
AssigneeHitachi, Ltd.
InventorsYuusuke Takamoto, Ryoso Masaki, Sanshiro Obara, Satoru Kaneko
Life of this patent
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Abstract
An electric vehicle control unit capable of position control so that the vehicle can be held in its stop position without vibration, even if an operator does not keep the brake pressed. The control circuit of the electric vehicle comprises a speed/torque instruction generation circuit, a position control selection circuit, a position instruction generation circuit and a motor control circuit. When the vehicle stops, control of the motor is changed from speed or torque control to position control.
Claims26
Method of controlling operation of a vehicle propelled by an electric motor, comprising the steps of:
- generating a speed/torque control signal in response to input from a vehicle operator;
- controlling movement of said vehicle by adjusting speed or torque of said electric motor in response to said speed/torque control signal;
- sensing when said vehicle comes to a stop and generating a position control selection signal in response thereto;
- generating a position control signal in response to a desired stop position entered by said vehicle operator;
- and
- when said position control selection signal is operative, controlling said electric motor in response to said position control signal.
Method of controlling operation of a vehicle propelled by an electric motor, comprising the steps of:
- sensing when said vehicle comes to a stop;
- sensing an initial stop position of said motor when said vehicle comes to a stop;
- and
- controlling torque of said electric motor to maintain the vehicle in a desired stop position.
Method of operating a vehicle propelled by an electric motor, comprising the steps of:
- generating a position control selection signal when said vehicle is stopped;
- generating a torque signal;
- and
- controlling said electric motor in response to said torque signal;
- wherein said torque signal is determined in response to a desired vehicle speed when no position control selection signal is generated, and said torque signal is determined according to a desired vehicle position when said position control selection signal is generated.
Method of controlling operation of a vehicle propelled by an electric motor and having a motor control unit, comprising the steps of:
- said motor control unit generating a speed/torque control signal in response to input commands from a vehicle operator;
- said control unit controlling movement of said vehicle by adjusting speed or torque of said electric motor in response to said speed/torque control signal;
- said control unit sensing when said vehicle comes to a stop and generating a position control selection signal in response thereto;
- said control unit generating a position control signal in response to a desired stop position entered by said vehicle operator;
- and
- when said position control selection signal is operative, said control unit controlling said electric motor in response to said position control signal.
Apparatus for controlling operation of a vehicle propelled by an electric motor, comprising the steps of:
- means for generating a speed/torque control signal in response to input from a vehicle operator;
- means for controlling movement of said vehicle by adjusting speed or torque of said electric motor in response to said speed/torque control signal derived from input from a vehicle operator;
- means for sensing when said vehicle comes to a stop and for generating a position control selection signal in response thereto;
- means for generating a position control signal in response to a desired stop position entered by said vehicle operator;
- and
- means operative when said position control selection signal is operative, for controlling said electric motor in response to said position control signal.
Dependencies are inferred from the claim text.