BRAKE CONTROLLER OF ELECTRIC VEHICLE

摘要

A brake controller of an electric vehicle is prevented from becoming a state of excessive braking power or a state of insufficient braking power. An electric braking power command controlling portion (15) generates an electric braking power command (14) for each motor. A comparison pattern generating portion (5) generates an electric braking power comparison pattern (10) for a falling advance announcement signal which is an electric braking power comparison pattern (9) for falling shifted by a predetermined frequency in a direction of increasing the motor frequency. The electric braking power comparison pattern (9) for falling is used for switching electric braking power to mechanical braking power, while reducing the electric braking power to zero when terminating the electric brake. A comparing portion (7) outputs a smaller signal among the electric braking power command (14) and electric braking power comparison pattern (9) for falling as an electric braking power pattern (11) to a motor controlling portion (31). A comparing portion (8) outputs a signal which is output in the timing that the electric braking power comparison pattern (10) for a falling advance announcement signal becomes the electric braking power command (14) or below as a falling advance announcement signal (4) to a mechanical brake controller (2).