Patent ID: 7673949
Filing Date: 2010-03-09
Classification: B60T,F16D

Abstract:
1. An electrically powered brake system comprising: a brake pad that presses against a disc rotor that rotates with a wheel; an electrically powered motor that generates a rotating torque; a conversion mechanism that generates a pressing force for pressing the brake pad based on the rotating torque generated by the electrically powered motor; a parking brake mechanism including a locking mechanism that mechanically retains the pressing force for pressing the brake pad; a rotation angle sensor that detects a rotation angle of the electrically powered motor; a braking force sensor that measures a braking force of the brake pad; an electric current sensor that measures a value of an electric current for driving the electrically powered motor; and a control unit that generates the electric current for driving the electrically powered motor and performs a diagnosis, wherein the control unit comprises: the braking force sensor failure detecting portion performs a failure detection of the braking force sensor when it is detected by the parking brake actuation determining portion that the vehicle is in the parked state, and the electric current sensor failure detecting portion measures the output of the electric current sensor when it is detected by the parking brake actuation determining portion that the vehicle is in the parked state, and detects an abnormality in the electric current sensor based on whether or not the output value of the electric current sensor falls within a predetermined range.