Patent ID: 6756750
Filing Date: 2004-06-29
Classification: B60L,Y02T

Abstract:
An electric vehicle comprising:a vehicle body; a directional speed member mounted to the vehicle body and being movable to a forward travel position, a neutral state position and a reverse travel position of the vehicle; a pair of left and right electric motors mounted to the vehicle body for driving left and right driving wheels based on the position of the directional speed member; left and right driving circuits for driving the left and right electric motors; a pair of left and right electromagnetic parking brakes for applying holding brakes to prevent rotation of the left and right driving wheels when the said vehicle is in the neutral state, each of the left and right electromagnetic parking brakes being selectively operative in a braking state in which it applies the holding brake and a released state in which it releases the holding brake; a pair of left and right short-circuiting brake circuits associated with the pair of left and right electric motors, respectively, and being operative to short-circuit two poles of each respective electric motor to thereby bring the electric motors into a suddenly braked state to prevent rotation of the left and right driving wheels; and a controller for controlling movement of the vehicle to prevent drag of the electromagnetic parking brakes by controlling the left and right electromagnetic parking brakes and the left and right short-circuiting brake circuits such that the short-circuiting brake circuits are in an operating state to prevent rotation of the left and right driving wheels during a time period when the left and right electromagnetic parking brakes are being switched from the braking state to the released state.