×

Anti-lock brake system for vehicles

  • US 4,925,254 A
  • Filed: 09/08/1988
  • Issued: 05/15/1990
  • Est. Priority Date: 09/21/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A vehicle anti-lock brake system, said anti-lock brake system comprising:

  • (a) a solenoid control valve connectable at a fluid pressure inlet port to enable communication of fluid pressure thereto from a source of such fluid pressure, said solenoid control valve being connectable at a fluid pressure outlet port to a predetermined pair of brake cylinders positioned on such vehicle, said solenoid control valve controls communication of such fluid pressure to such predetermined pair of brake cylinders and evacuation of such fluid pressure from such predetermined pair of brake cylinders;

    (b) a speed sensing means positionable on such vehicle adjacent each brakeable wheel for each of determining a rotational speed of such brakeable wheel and for generating an electrical signal having a value representative of such rotational speed and for transmitting said electrical signal;

    (c) an electronic control system positionable on such vehicle and electrically connectable at an input terminal thereof to each said speed sensing means to enable receiving said electrical signal value generated by said speed sensing means, said electronic control system being electrically connectable at an output terminal thereof to enable transmission of an electrical control signal to an input terminal of said solenoid control valve;

    (d) a means disposed in said electronic control system for determining when said electrical signal value received by said electronic control system from each said speed sensing means is representative of a deceleration signal value of a low wheel, said electronic control system in response to said electrical signal value being representative of said deceleration signal value transmits a pressure hold electrical control signal to said input terminal of said solenoid control valve;

    (e) a means disposed in said electronic control system for determining when said electrical signal value received by said electronic control system from each said speed sensing means is representative of a slip signal value of a low wheel, said electronic control system in response to said electrical signal value being representative of said slip signal value transmits a pressure decrease electrical control signal to said input terminal of said solenoid control valve;

    (f) a means disposed in said electronic control system for determining when said electrical signal value received by said electronic control system from each said speed sensing means is representative of a decrease in said electrical signal value of said slip signal value of such low wheel, said electronic control system in response to said decrease in said electrical signal value representative of said slip signal value of such low wheel transmits a pressure increase electrical control signal to said input terminal of said solenoid control valve;

    (g) a switch means disposed in said electronic control system for switching to a select low control mode; and

    (h) a timer means disposed in said electronic control system for determining a time duration of an electrical signal value being received by said electronic control system from each said speed sensing means and wherein said switching means in said electronic control system will switch to said select low control mode when said speed sensing means adjacent each of a high wheel and a low wheel transmits an electrical signal value representative of a slip signal value to said input terminal of said electronic control system for a duration of about 100 ms as determined by said timer means.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×