Wheel braking system
AssigneeUnisia Jecs Corporation
InventorsJunsuke Kuroki, Eiji Yagi, Akira Kimura, Ichiro Kaneda
Life of this patent
Estimating the term…
Abstract
A wheel braking system comprises a motor driven gear pump, a relief line connecting the pump discharge to the pump intake, a wheel brake unit connected to the pump discharge, and a flow restriction in the relief line. A control unit controls the motor for the pump in response to an output signal of a brake pedal sensor. The brake pedal sensor generates the output signal indicative of the brake pedal stamping force. The control unit determines a desired motor speed for the sensed brake pedal stamping force and operates the motor.
Claims11
A wheel braking system for a vehicle, comprising:
- a master cylinder;
- a brake pedal operable by a vehicle operator, said brake pedal being operatively connected to said master cylinder;
- a wheel brake unit;
- a motor driven gear pump having a pump intake connected to said master cylinder and a pump discharge connected to said wheel brake unit;
- a relief line that bypasses said pump;
- a variable flow restriction that restricts flow of hydraulic fluid through said relief line, said variable flow restriction being variable in cross sectional area in response to a flow restriction control signal;
- a brake sensor that detects a brake pedal force applied by the vehicle operator and generates a brake force signal indicative thereof;
- and
- a control unit that determines, in response to said brake force signal, a desired flow cross sectional area of said variable flow restriction, and generates said flow restriction control signal needed to control said variable flow restriction to maintain said desired flow cross sectional area.
A wheel braking system for a vehicle comprising:
- a master cylinder;
- a brake pedal operable by a vehicle operator, said brake pedal being operatively connected to said master cylinder;
- a plurality of wheel brake units;
- a plurality of motor driven gear pumps, each having a pump intake connected to said master cylinder and a pump discharge connected to one of said wheel brake units;
- a plurality of relief lines that bypasses said pumps, respectively;
- a plurality of variable flow restrictions that restrict flow of hydraulic fluid through said relief lines, each of said variable flow restrictions being variable in cross sectional area in response to a flow restriction control signal;
- a brake sensor that detects a brake pedal force applied by the vehicle operator and generates a brake force signal indicative thereof;
- and
- a control unit that determines, in response to said brake force signal, a desired flow cross sectional area of the respective variable flow restriction, and generates said flow restriction control signal needed to control the respective variable flow restriction to maintain said desired flow cross sectional area.
Dependencies are inferred from the claim text.