Brake control apparatus

摘要

A controller sets a target hydraulic pressure of a master cylinder based on the operation amount of a brake pedal, and controls the action of an electric motor so that a master cylinder hydraulic pressure attains the target hydraulic pressure. A brake characteristic representing a relationship between a motor rotation position detected by a resolver and the master cylinder hydraulic pressure as detected by the hydraulic pressure sensor is stored and updated. When the hydraulic pressure sensor is abnormal, a target motor rotation position corresponding to the target hydraulic pressure is set using the updated brake characteristic, and the action of the electric motor is controlled. The electric motor is controlled based on the updated brake characteristic, and hence fluctuations in the vehicle deceleration with respect to the brake operation can be suppressed and a sense of discomfort for the driver can be alleviated.

主权项

1. A brake control apparatus, comprising:
an operation amount detector for detecting an operation amount of a brake pedal; an electric motor for moving a piston of a master cylinder; a hydraulic pressure detector for detecting a brake hydraulic pressure in the master cylinder; and a control device for setting, depending on the detection by the operation amount detector, a target hydraulic pressure of the master cylinder, and controlling, based on a detected value of the hydraulic pressure detector, an action of the electric motor so that the master cylinder attains the target hydraulic pressure, wherein: the control device connects to fluid amount detection means for detecting a value relating to a discharged fluid amount of the master cylinder; and the control device is configured to:
update, when the hydraulic pressure detector is normal, based on the detected value by the hydraulic pressure detector and a detection result by the fluid amount detection means, a brake characteristic representing a relationship between the brake hydraulic pressure of the master cylinder and the value relating to the discharged fluid amount; andcalculate, when the hydraulic pressure detector is abnormal, by using the brake characteristic, a value relating to a target discharged fluid amount corresponding to the target hydraulic pressure of the master cylinder, and control the action of the electric motor so that the detected value by the fluid amount detection means attains the value relating to the target discharged fluid amount.