초록 ▼

A brake control device has a master cylinder, wheel cylinder, and a solenoid valve disposed in a conduit between the master cylinder and the wheel cylinder. When a brake pedal happens to be returned at sudden braking, at an idle stop or at vehicle stop on a sloping road, the solenoid valve is contro

A brake control device has a master cylinder, wheel cylinder, and a solenoid valve disposed in a conduit between the master cylinder and the wheel cylinder. When a brake pedal happens to be returned at sudden braking, at an idle stop or at vehicle stop on a sloping road, the solenoid valve is controlled at a duty rate based on a difference between a peak value of master cylinder and an actual value of master cylinder reducing so that wheel cylinder pressure is held to a value higher than master cylinder pressure.

대표청구항 ▼

1. A brake control device for vehicle comprising:brake pressure producing means for producing hydraulic pressure in response to a driver's brake pedal operation; a fluid conduit whose one end is connected with the brake pressure producing means; a solenoid valve disposed in the fluid conduit so that

1. A brake control device for vehicle comprising:brake pressure producing means for producing hydraulic pressure in response to a driver's brake pedal operation; a fluid conduit whose one end is connected with the brake pressure producing means; a solenoid valve disposed in the fluid conduit so that the fluid conduit may be provided on a side of the brake pressure producing means with a first hydraulic pressure and on a side opposite to the brake pressure producing means with a second hydraulic pressure; braking force generating means connected with another end of the fluid conduit for generating braking force upon receipt of the second hydraulic pressure so that brake fluid may be communicated via the solenoid valve between the brake pressure producing means and the braking force generating means; a pressure sensor for generating a signal representing a value corresponding to driver's brake pedal depressing force; memory means for receiving the pressure sensor signal and memorizing a peak value thereof; calculating means connected in circuit with the pressure sensor and the memory means for calculating a control amount based on a difference between the peak value of the pressure sensor signal and an actual value of the pressure sensor signal to be lowered when the brake pedal is returned; and driving means connected in circuit with the solenoid valve and the calculating means for driving the solenoid valve so as to restrict brake fluid flow from the braking force generating means to the brake pressure producing means in response to the control amount, wherein, a braking force holding control is executed in such a way that, while an increasing speed of the second hydraulic pressure is substantially equal to that of the first hydraulic pressure when the brake pedal is depressed, a reducing speed of the second hydraulic pressure is lower than that of the first hydraulic pressure during a given period when the brake pedal happens to be returned.