Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-06-15
2000-03-07
Schwartz, Chris
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
188358, B60T 832, B60T 1366
Patent
active
060330368
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electronically controllable brake actuating system for automotive vehicles which includes a master brake cylinder operable by an actuating pedal and having at least one piston, at least one braking pressure generator actuatable by an electronic control unit, to which braking pressure generator wheel brakes of the vehicle are directly connected and which is connectable to the master brake cylinder by at least one hydraulic connection closable by a valve assembly, at least one sensor device to identify the driver's wish for deceleration, and a simulator chamber which interacts with the master brake cylinder.
A brake actuating system of this type is disclosed in applicant's former application No. 44 13 579. In the prior art brake actuating system, two simulator chambers are associated with the pressure chambers of the master brake cylinder that is configured as a tandem master brake cylinder. The simulator chambers are connected to the pressure chambers by the intermediary of a parallel combination of an electrically actuatable, preferably normally closed (NC) two-way/two-position directional control valve and a non-return valve which opens towards the master brake cylinder.
A disadvantage in the prior art brake actuating system is that the electromagnetically operable two-way/two-position directional control valves, which must be energized with each activation of the system, become frequently leaky in operation and, thus, are a potential source of malfunction.
Therefore, an object of the present invention is to provide an improved electronically controllable brake actuating system of the type referred to hereinabove in terms of an enhanced reliability in operation. In addition, the circuit arrangement of a system of this type shall be simplified considerably.
SUMMARY OF THE INVENTION
A first solution to this object involves that the simulator chamber is connected to a hydraulic chamber, bounded in the master brake cylinder by a second piston, by way of a closable connection. In a preferred aspect of the present invention, the simulator chamber is connected to an annular chamber which is confined in the master brake cylinder by the second piston, and the annular chamber is connected to the hydraulic chamber in a closable way.
According to a second solution to the object of the present invention, the simulator chamber is provided in the master brake cylinder separated from said pressure chamber, limited by a second piston and connected by a closable connection to an unpressurized pressure fluid supply reservoir that is in connection to the pressure chambers of the master brake cylinder.
The present invention will be explained in detail in the following description of two embodiments, making reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings,
FIG. 1 is a circuit diagram of a first embodiment of the brake actuating system of the present invention.
FIG. 2 is a partly cross-sectional view of a second embodiment of the master brake cylinder which can be used in the brake actuating system of the present invention.
FIG. 3 is a partial area of a master brake cylinder shown in FIG. 1 or 2 in an actuating position which corresponds to a case of malfunction.
DETAILED DESCRIPTION OF THE DRAWINGS
The electronically controllable brake actuating system of the present invention (shown in the drawing) is intended for use in a front-wheel driven vehicle. The system includes a dual-circuit master brake cylinder or tandem master cylinder 2 operable by an actuating pedal 1. Cylinder 2 includes pressure chambers 17, 19 which are separated from each other and bounded by two pistons 18, 20, and connected to an unpressurised pressure fluid supply reservoir 3. On the one hand, the first pressure chamber (primary pressure chamber) 17 is connected by way of a closable first hydraulic line 11 to a first electrically actuatable braking pressure generator 4 to which a hydraulic wheel brake 8 associated with the front axle, for ex
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Jungbecker Johann
Ruffer Manfred
ITT Manufacturing Enterprises Inc.
Schwartz Chris
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