Electric vehicle drive train with rollback detection and compensation
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United States of America Patent
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Dec 27, 1994
Grant Date -
N/A
app pub date -
Feb 11, 1993
filing date -
Feb 11, 1993
priority date (Note) -
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Abstract
An electric vehicle drive train includes a controller for detecting and compensating for vehicle rollback, as when the vehicle is started upward on an incline. The vehicle includes an electric motor rotatable in opposite directions corresponding to opposite directions of vehicle movement. A gear selector permits the driver to select an intended or desired direction of vehicle movement. If a speed and rotational sensor associated with the motor indicates vehicle movement opposite to the intended direction of vehicle movement, the motor is driven to a torque output magnitude as a nonconstant function of the rollback speed to counteract the vehicle rollback. The torque function may be either a linear function of speed or a function of the speed squared.
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