Patent ID: 7420339
Filing Date: 2008-09-02
Classification: B60K,B60L,B60W,B60Y,Y02T

Abstract:
1. A regenerative braking system, comprising: a capacitor electrically connected to a stack of a fuel cell vehicle and configured to be charged by the stack; a traction motor supplied with electric power from the stack or from both the stack and the capacitor so as to drive the fuel cell vehicle and which supplies electric power generated by regenerative braking to the capacitor; a motor control unit that controls electric power input to the traction motor and electric power output from the traction motor; a chopper connected to the capacitor so as to be ON and OFF switched when braking of the fuel cell vehicle is performed on a level load or a downhill thereby limiting charging voltage of the capacitor; a braking resistor which is connected to the chopper and the capacitor and consumes regenerative energy generated by a traction motor while the fuel cell vehicle is braked as heat using a resistor so as to serve as an auxiliary brake; and a hybrid control unit which turns on the chopper in case that a charging voltage limit which can be stored to the capacitor is exceeded so as to control overcharge of the capacitor and turns off the chopper in case that charging voltage of the capacitor descends.