US 5,294,190 AGranted

Brake system with at least one brake circuit

AssigneeWABCO Westinghouse Fahrzeugbremsen GmbH

InventorsJoachim Feldmann, Erwin Peterson, Manfred Schult

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Abstract

A brake system with at least one brake circuit comprises a mechanical brake-pressure control device and an electrical brake-pressure control device. The brake system is constructed without additional expenditure and by use of a mechanical brake-pressure control device and by an electrical control valve device. The system is constructed such that the brake-pressure modulator (8) of the electrical brake-pressure control device (6, 8, 11, 19) can also be controlled by pressure. The brake-pressure modulator (8) meters the brake pressure, both on the strength of the supplied electrical signal as well as according to the value level of the fed-in redundant brake pressure. The control electronics (11, 19) of the electrical brake-pressure control device (6, 8, 11, 19) is constructed such that it sets the strength of the electrical signal to a value required for covering and for meeting the respective brake-pressure demand request. The invention structure can be employed preferably in connection with road vehicles and motor vehicles.

A brake system comprising

a brake-value furnishing unit delivering an electrical actuation signal upon actuation by a driver;
at least one brake circuit having a pressure supply and actuated by feeding-in a brake pressure;
a brake-pressure sensor at said brake circuit;
a mechanical brake-pressure control device furnishing a redundant brake pressure;
an electrical brake-pressure control device comprising at least one brake-pressure modulator which is actuatable by a magnet, wherein said brake-pressure modulator is associated with said brake circuit;
said electrical brake-pressure control device further comprising an electronic control device receiving a brake-pressure signal from said brake-pressure sensor and receiving said actuation signal delivered by said brake-value furnishing unit and transforming said actuation signal into a brake-pressure demand request signal and further controlling a magnetic current delivered to said magnet of said brake-pressure modulator;
said brake-pressure modulator having a first inlet, a second inlet and an outlet at which said brake-pressure modulator furnishes said brake pressure;
said first inlet of said brake-pressure modulator being connected with said pressure supply;
said second inlet of said brake-pressure modulator being connected with said mechanical brake-pressure control device;
said outlet of said brake-pressure modulator being connected with said brake circuit;
said brake-pressure modulator delivering a brake pressure which is composed of a component determined by said redundant brake pressure furnished by the mechanical brake-pressure control device and of a component determined by a value of said magnet current;
and
said electronic control device being constructed such that it sets said magnet current to a value required for determining said component of said brake pressure delivered by said brake-pressure modulator determined by a value of said magnet current such that the brake-pressure signal received from said brake-pressure sensor at said brake circuit equalizes the momentary brake-pressure demand request signal.

10 more elements

Abstract

Claims14