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    • 77. 发明授权
    • Anti-skid control system for a four-wheel drive vehicle
    • 四轮驱动车辆的防滑控制系统
    • US5634699A
    • 1997-06-03
    • US545334
    • 1995-10-19
    • Hiroyuki IchikawaKenji Tanaka
    • Hiroyuki IchikawaKenji Tanaka
    • B60T8/172B60T8/1763B60T8/1769B60T8/32B60T8/58
    • B60T8/322B60T8/1769B60T2210/12B60T2210/14
    • The invention is directed to an arrangement for controlling a braking force applied to each of front and rear road wheels of a four-wheel drive vehicle depending upon a braking condition, with a hydraulic braking pressure supplied to each of the wheel brake cylinders through an actuator. The actuator is controlled by a braking force controller into which output signals of wheel speed sensors are fed. On the basis of the wheel speeds detected by the sensors, a wheel acceleration of each road wheel is calculated. Also, an oscillation of a relative movement between the front and rear road wheels is determined. And, a coefficient of friction of a road is estimated in accordance with the wheel acceleration and the oscillation. For example, it is estimated that the road is of a relatively low coefficient of friction, when a mean wheel acceleration of all road wheels becomes less than a predetermined standard acceleration, and when the oscillation is caused to exceed a predetermined level. Then, the hydraulic braking pressure applied to each of the wheel brake cylinders is controlled by the braking force controller in accordance with the estimated coefficient of friction and in response to each wheel speed.
    • 本发明涉及一种用于根据制动条件来控制施加到四轮驱动车辆的前后车轮上的制动力的装置,其中通过致动器向每个车轮制动缸提供液压制动压力 。 执行器由制动力控制器控制,其中馈送有车轮速度传感器的输出信号。 基于由传感器检测到的车轮速度,计算每个车轮的车轮加速度。 此外,确定前轮和后轮之间的相对运动的振荡。 并且,根据车轮加速度和振动来估计道路的摩擦系数。 例如,当所有车轮的平均车轮加速度小于预定的标准加速度,并且当使振荡超过预定水平时,估计道路具有相对较低的摩擦系数。 然后,根据估计的摩擦系数和响应于每个车轮速度,由制动力控制器控制施加到每个车轮制动缸的液压制动压力。
    • 80. 发明授权
    • Anti-skid apparatus for automotive vehicle
    • 汽车防滑装置
    • US5461565A
    • 1995-10-24
    • US929408
    • 1992-08-14
    • Shinsuke SakaneHiroyuki IchikawaNobuyasu NakanishiTatsuo Sugitani
    • Shinsuke SakaneHiroyuki IchikawaNobuyasu NakanishiTatsuo Sugitani
    • B60T8/58B60T8/1761B60T8/64B60T8/60
    • B60T8/17616
    • An anti-skid apparatus for installation in a vehicle braking system includes an electrically operated actuator arranged to control hydraulic brake pressure applied to each wheel brake cylinder of road wheels of the vehicle and an electronic control device for applying an electric control signal to the actuator in response to electric signals indicative of each rotational speed of the road wheels so that the actuator is operated to decrease or increase the brake pressure when the rotational speed of the road wheels in braking operation becomes lower than a reference speed the value of which is defined on a basis of a travel, speed of the vehicle. The electronic control device is designed to detect a step on a travel road of the vehicle in braking operation and to compare the rotational speed of the road wheels with a subtracted value of the reference speed when the step on the travel road has been detected within a predetermined time thereby to maintain the actuator in its deactivated condition when the rotational speed of the road wheels is larger than the subtracted value of the reference speed.
    • 用于安装在车辆制动系统中的防滑装置包括:电动致动器,其被布置成控制施加到车辆的车轮的每个车轮制动缸的液压制动压力;以及电子控制装置,用于向致动器施加电控制信号 响应于指示车轮的每个转速的电信号,使得当制动操作中的车轮的转速变得低于其值定义在其上的参考速度时,致动器被操作以降低或增加制动压力 旅行的基础,车辆的速度。 电子控制装置被设计成在制动操作中检测车辆的行驶道路上的台阶,并且当在行驶道路中的步骤已被检测到时,将车轮的转速与基准速度的减去值进行比较 预定时间,从而当车轮的转速大于参考速度的减去值时,将致动器保持在停用状态。