Jidosha Kiki Co., Ltd.

Yugen Kaisha Jiro Collection

Jiro Satoh

Takashi Kushiyama

Morihiko Shimamura

Isao Yagi

A first threshold value of a fixed amount of vehicle velocity arranged on the lower side of the vehicle velocity is set, and a second threshold value of a fixed amount of vehicle velocity also arranged on the lower side of vehicle velocity, which second threshold is greater than that of the first threshold value. The difference between vehicle velocity at maximum recovery velocity of wheel velocity and the maximum recovery velocity of the wheel velocity is compared with the first and second threshold values, and the next point at which a changeover is made to repressurization of brake fluid is altered in dependence upon the results of the comparison. Accordingly, repressurization of the brake cylinder is controlled in dependence upon the condition of the road surface on which the vehicle is traveling, and more appropriate antiskid braking control can be achieved.

Antiskid brake control method

An antiskid brake control system includes a supply passageway (16) bypassing a pressure-compensated flow control valve (13), and a check valve (22), which allows flow of brake fluid only toward a wheel cylinder, or a check valve (23), which allows flow of brake fluid only away from the wheel cylinder, is provided inside the supply passageway (16) and arranged in series with an orifice (15). Accordingly, antiskid brake control is such that either slow and fast pressurization modes, a fast depressurization mode and a holding mode or slow and fast depressurization modes, a fast pressurization mode and a holding mode are established. A sudden fluctuation in braking hydraulic pressure can be suppressed by establishing the holding mode when there is a transition from the fast depressurization mode to the fast pressurization mode or from the fast pressurization mode to the fast depressurization mode. Since this prevents a large fluctuation in the speed of adjustment, riding comfort is greatly improved during antiskid braking control and kickback developed by a brake pedal is suppressed, thereby improving driving feeling.

Growing community of inventors

Higashimatsuyama, Japan

Jiro Satoh