Brake pressure control device for automobile

Abstract

Abstract PURPOSE:To perform stable control until stoppage by continuing the estimate of the body speed by the judging means of a brake pressure control device using the deceleration ceiling value smaller than the previous value when the rear wheel speed becomes zero. CONSTITUTION:An ECU 15, judging the lock tendency of rear wheels 4, 5 on the basis of signals from wheel speed sensors 6, 7, adjusts the brake pressure of a rear wheel brake system BR2 through a solenoid valve 10. The wheels are easily locked on the road surface of low road surface friction coefficient, and once locked, it takes time for the wheel speed to be reset even if the brake pressure is reduced. Accordingly, when the speed of the rear wheels becomes zero, the deceleration ceiling value for estimating the body speed is changed over to the smaller value so as to minimize the decrease rate of the body speed estimate, thus suppressing its sudden decrease. Meanwhile, brake pressure control is continued in order to give sufficient allowance for a certain degree of recovery of the wheel speed, thus preventing the wheels from being locked. The stable control until stoppage can be thus realized.

Inventors

• 👤 Shiyuusaku Fujimoto
• 👤 藤本　周策
• 👤 Takashi Watanabe
• 👤 多佳志 渡辺

Bibliographic Details