Failure diagnosis method for brake system of vehicle

摘要

A failure diagnosis method for a brake system of a vehicle determines whether the failure occurs in a regenerative braking device, a front-wheel friction braking device or a rear-wheel friction braking device. The method may include comparing a driver's required acceleration/deceleration with a current acceleration/deceleration of the vehicle, determining that a failure has occurred in the brake system of the vehicle when the driver's required acceleration/deceleration is different from the current acceleration/deceleration of the vehicle and comparing a driver's required braking torque with a regenerative braking maximum torque, and determining that the failure does not occur in the brake system of the vehicle when the driver's required acceleration/deceleration is substantially equal to the current acceleration/deceleration of the vehicle.

主权项

1. A failure diagnosis method for a brake system of a vehicle, comprising:
comparing by a controller, a driver's required deceleration with a current deceleration of the vehicle; determining by the controller that a failure has occurred in the brake system of the vehicle when the driver's required deceleration is different from the current deceleration of the vehicle; comparing by the controller a driver's required braking torque with a regenerative braking maximum torque when the failure is determined to have occurred, wherein, when the driver's required braking torque is less than the regenerative braking maximum torque, it is determined by the controller that a braking of the vehicle is performed with only a regenerative braking and the failure has occurred in a regenerative braking device of the brake system; comparing a front-wheel required braking torque with the regenerative braking maximum torque, when the driver's required braking torque is greater than or equal to the regenerative braking maximum torque; comparing vehicle braking deceleration with a decrement of braking deceleration, when the front-wheel required braking torque is less than the regenerative braking maximum torque; and determining that the failure has occurred in a rear-wheel friction braking device, when the vehicle braking deceleration is greater than or equal to the decrement of the braking deceleration, and determining that the failure has occurred in the regenerative braking device, when the vehicle deceleration is less than the decrement of the braking deceleration.