US 3,942,844 AGranted

Anti-skid control systems including an emergency accumulator for braking and skid control operations

AssigneeAisin Seiki Kabushiki Kaisha

InventorsMasami Inada, Toshiyuki Kondo

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Abstract

An actuator arranged between a hydraulic brake master cylinder and vehicle wheels for permitting the delivery therethrough of the braking pressure from the former to the latter includes solenoids responsive to signals from a computer which is adapted to sense the skidding of the wheels. Upon actuation of the solenoids, fluid pressure is no longer introduced into the actuator from a pump, as through a brake booster operatively connected to the brake pedal of the motor vehicle on the one hand and to the brake master cylinder on the other hand, so that the actuator suspends the delivery of the braking pressure to the wheels pending the cessation of the skidding. An accumulator is provided for delivering fluid pressure to the actuator, for example, in the event of the malfunctioning of the pump.

Claims11

Dependent claims

An antiskid control system for a motor vehicle comprising, in combination:

a source of fluid pressure;
a brake master cylinder;
brake booster means arranged between said source and said brake master cylinder, said brake booster means including valve means adapted to be operated by the motor vehicle driver for actuating said brake master cylinder;
computer means for sensing the skidding of the wheels of the motor vehicle;
actuator means normally receiving the fluid pressure from said booster for permitting the delivery therethrough of the braking pressure from said brake master cylinder to said wheels, said actuator means including means responsive to said computer means whereby said actuator means is caused to control the delivery of the braking pressure to said wheels when their skidding is sensed by said computer means;
first accumulator means for delivering fluid pressure to said brake booster means to permit the same to actuate said brake master cylinder in the event said source fails to deliver the fluid pressure to said brake booster means;
second accumulator means;
and
pressure-sensitive valve means arranged between said second accumulator means and said actuator means for permitting the delivery therethrough of the fluid pressure from said second accumulator means to said actuator means in the event said source fails to deliver the fluid pressure thereto.

6 more elements

An antiskid control system for a motor vehicle driven by a driver comprising:

a source of fluid pressure;
a brake master cylinder;
brake booster means disposed between said source of fluid pressure and said brake master cylinder and having means for controlling hydraulic fluid flow from said source of fluid pressure according to control by the driver to actuate said brake master cylinder;
computer means for sensing a skid condition of wheels of the motor vehicle to issue a signal according to said skid condition;
actuator means disposed between said brake master cylinder and said wheels to supply fluid pressure therethrough to said wheels for braking operation and directly deriving from said brake booster means hydraulic fluid for actuation thereof, said actuator means having means for controlling fluid pressure from said brake master cylinder to said wheels according to the signal of said computer means;
and
accumulator means for supplying fluid pressure to said actuator means for braking and skid control operations in the event said source of fluid pressure fails.

4 more elements

An antiskid control system for a motor vehicle driven by a driver comprising:

a source of fluid pressure;
a brake master cylinder;
brake booster means disposed between said source of fluid pressure and said brake master cylinder and having means for controlling hydraulic fluid flow from said source of fluid pressure according to control by the driver to actuate said brake master cylinder;
computer means for sensing skid condition of wheels of the motor vehicle to issue a signal according to said skid condition;
actuator means disposed between said brake master cylinder and said wheels to supply fluid pressure therethrough to said wheels for braking operation and directly deriving from said brake booster means hydraulic fluid for actuation thereof, said actuator means having means for controlling fluid pressure from said brake master cylinder to said wheels according to the signal of said computer means, and
bypass means for supplying fluid pressure from said brake master cylinder to said wheels in the event said source of fluid pressure fails.

3 more elements

Dependencies are inferred from the claim text.