Patent ID: 6213571
Filing Date: 2001-04-10
Classification: B60L,Y02T

Abstract:
A control apparatus for an electric vehicle comprising:a dc motor;a field switching unit for switching a direction of excitation of fields by switching connection of field winding of said dc motor;a dc power supply for supplying power to said dc motor;a switching unit for controlling said power supplied from said dc power supply and flowing a current to said dc motor;a regeneration contactor interconnected between said dc power supply and said dc motor;a control unit for controlling operation of said switching unit and said regeneration contactor such that said dc motor is operated in either modes of powering, regenerating braking or plugging braking, whereinwhen shifting operation of said dc motor from its regenerating braking to plugging braking, detection of closure of said regeneration contactor is determined on the basis of a contact voltage of said regeneration contactor which is sensed between said regeneration contactor and an armature of said dc motor, and upon detection of the closure thereof, operation of said switching unit is stopped to allow for a transition to said plugging braking.