US 4,861,115 AGranted

Electrically-controlled motor vehicle brake system

AssigneeWABCO Westinghouse Fahrzeugbremsen GmbH

InventorErwin Petersen

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Abstract

An electrically-controlled motor vehicle brake system, which responds to fluid pressure supplied from a common source. The system includes an electronic control system to process information and issue brake commands. A brake cylinder, to apply and release brake pressure on each respective wheel brake, receives pressure from at least one solenoid valve, connected to receive pressure from the source. The pressure is communicated to the brake cylinder of each respective wheel brake upon receipt of a control signal from the control system. A brake power selector includes both a pedal-operated brake valve, connected on an input side to receive pressure from the source, and connected on an output side to a ventilation portion of the solenoid valve for modulating the brake pressure, and an electrical frequency selector is connected to provide an input signal to the electronic control system upon actuation by an operator of such vehicle during a brake application.

Claims12

Dependent claims

An electrically-controlled motor vehicle brake system which responds to pneumatic pressure supplied from a common source positioned on such motor vehicle and which exhausts said pneumatic pressure solely through an exhaust port of a brake valve means forming a portion of said vehicle brake system, said vehicle brake system comprising:

(a) an electronic control system positioned on such vehicle;
(b) a brake cylinder associated with each respective wheel brake on such vehicle to apply and release said each such respective wheel brake;
(c) at least one solenoid valve means which includes three fluid communication ports, a first of said three fluid communication ports is connected to receive pneumatic pressure from such source and a second of said three fluid communication ports is connected to communicate said pneumatic pressure to said brake cylinder of said each respective wheel brake, said at least one solenoid valve is electrically connected to receive a control signal from said electronic control system so that upon receipt of an appropriate control signal from said electronic control system said pneumatic pressure will be one of supplied to and exhausted from said each respective wheel brake;
and
(d) a brake power selector positioned on such vehicle, said brake power selector including:
(i) a pedal-operated brake valve means connected on an input side thereof to receive pneumatic pressure from such source and connected on an output side thereof to a third fluid communication port of said at least one solenoid valve means for modulating braking pressure, said brake valve means including an exhaust for sole venting of said pneumatic pressure from said brake system to atmosphere;
and
(ii) an electrical frequency selector connected to provide an input signal to said electronic control system upon actuation by an operator of such vehicle during a brake application.

5 more elements

An electrically-controlled motor vehicle brake system which responds to pneumatic pressure supplied from a common source positioned on such motor vehicle, said vehicle brake system comprising:

(a) an electronic control system positioned on such vehicle;
(b) a brake cylinder associated with each respective wheel brake on such vehicle to apply and release said each such respective wheel brake;
(c) a solenoid valve means associated with said each such respective wheel brake connected on an input side thereof to receive such pneumatic pressure from such common source and connected on an output side to communicate such pneumatic pressure to an associated brake cylinder, said solenoid valve means including an exhaust port;
(d) a brake power selector positioned on such vehicle, said brake power selector including:
(i) a pedal-operated brake valve means connected on an input side thereof to receive pneumatic pressure from such source and connected on an output side thereof to said exhaust port of said solenoid valve means for modulating braking pressure;
and
(ii) an electrical frequency selector connected to provide an input signal to said electronic control system upon actuation by an operator of such vehicle during a brake application;
and
(e) a wheel brake anti-locking system, said wheel brake anti-locking system including:
(i) cutoff valve means having a normally open position in which said output side of said brake valve means is connected to said exhaust port of each said solenoid vlve means and an exhaust position in which said exhaust port of each said solenoid valve means is vented to atmosphere;
and
(ii) speed sensing means positioned adjacent each wheel on such vehicle including said electronic control system for providing a wheel locking signal to actuate said cutoff valve means from said normally open position to said exhaust position.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/261,792Filed 24 Oct 1988 · continuation
Priority: DE 350117916 Jan 1985
Granted: 29 Aug 1989
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B60T 8/268
Using valves or actuators with external control means: using the valves of an ABS, ASR or ESP system
B60T 8/327
Systems in which the braking action is dependent on brake pedal data: pneumatic systems
B60T 13/58
With fluid assistance, drive, or release: combined or convertible systems
B60T 13/662
Electrical control in fluid-pressure brake systems: characterised by specified functions of the control system components