公开(公告)号：EP1095834A3

公开(公告)日：2001-08-16

申请号：EP00123731.2

申请日：2000-10-31

申请人： TOYOTA JIDOSHA KABUSHIKI KAISHA ,  Denso Corporation

发明人： Yamamoto, Takayuki, c/o Toyota Jidosha K.K. ,  Murashima, Keiji, c/o Toyota Jidosha K.K. ,  Sawada, Naoki, c/o Denso Corporation

IPC分类号： B60T8/32 ,  B60T7/04 ,  B60T8/88 ,  B60T13/74 ,  B60T8/52

CPC分类号： B60T13/74 ,  B60T7/042 ,  B60T8/3255 ,  B60T8/52 ,  B60T13/662

摘要： A pair of shoes are expanded by driving an electric brake motor (30). Due to the friction engagement of the shoes with a drum inner peripheral surface, a braking force is applied to a wheel. An actual braking torque is detected by a strain sensor (314) that detects the load applied to an anchor pin. Through a feedback control using the actual braking torque, the electric motor (30) is driven and controlled so that the actual braking torque becomes equal to a target braking torque that is determined in accordance with the amount of operation of a brake pedal (40). When the actual braking torque is undetectable, for example, during a stop of a vehicle, the electric motor (30) is driven and controlled through an actuating force control using the current through the electric motor (30) that is detected by a motor current sensor (31). The braking torque control apparatus controls the actual braking torque to a magnitude corresponding to brake operation, regardless of the magnitude of the coefficient of friction between a friction engagement member and a brake rotor. Even when the braking torque is undetectable, the apparatus executes brake control in a good manner.