Patent ID: 9630609
Date: 2017-04-25
CPC Classifications: B60T

Claim:
1. A method of detecting solenoid valve failure of a vehicle electric brake booster, the method comprising: driving, via a motor, and in response to a solenoid valve connected to the master cylinder being locked, a piston in the master cylinder away from a base position near the motor until the piston reaches a forward position away from the motor, thereby closing at least a cut-off hole in a wall of the master cylinder that allows fluid pressure exchange between an inside of the cylinder and an outside of the cylinder; measuring, using a pressure sensor installed at a piston chamber of the master cylinder, a first pressure in the piston chamber of the master cylinder in response to the piston being in the forward position; determining whether the first pressure exceeds a predetermined reference value; and determining that the solenoid valve is in a failure state in response to the first pressure being less than or equal to the predetermined reference value.