Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-09-25
1999-10-19
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303155, B60T 834
Patent
active
059676248
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of operating an anti-lock automotive vehicle brake system for driving stability control and/or traction slip control having an actuating unit which includes a dual-circuit master brake cylinder operable by a brake pedal, brake circuits associated with the individual vehicle wheels which are connected to pressure chambers of the master brake cylinder, valve assemblies of a hydraulic unit with a return pump which are interposed in the brake circuits, wherein, in a control operation, hydraulic pressure can be built up in each of the brake circuits by way of the return pump irrespective of the driver's wish, and wherein a pedal position sensor is provided which determines the actuating travel of the brake pedal and the output signal of which is sent to an electronic control unit.
German patent No. 42 08 496 discloses a brake system, wherein the brake force booster interacts with a solenoid valve to achieve automatically controlled braking operations along with a great deceleration of the vehicle. The solenoid valve permits an enhanced use of the braking pressure upon quick application of the brake pedal. A brake pedal position sensor, a brake light switch, and a force sensor which permits detection of the driver's wish for deceleration are provided to achieve the above-mentioned braking pressure control concept. Further, the known brake system includes an anti-lock control system (ABS) which ensures a stable deceleration behavior of the vehicle during braking operations.
However, the mentioned publication does not give any specific hints as to how the brake system described could be used for driving stability control.
German patent application No. 42 32 311 discloses a hydraulic vehicle brake system with anti-lock control which, for improving the vehicle tracking stability, in particular when cornering, includes an auxiliary pressure source which is used to prefill the vehicle wheel brakes and to precharge the return pump. The auxiliary pressure source, which is provided by parallel connection of an auxiliary pump, a restrictor and an auxiliary pressure limiting valve, is connected to an inlet port of each one hydraulic cylinder. The hydraulic cylinder is connected to the connection between the outlet of an actuating unit, comprising a brake force booster and a master cylinder inserted after the booster, and the ABS hydraulic unit or the wheel brake. A second inlet of the cylinder is connected to the master brake cylinder. The cylinder accommodates a separating piston which can be acted upon by the auxiliary pressure. The separating piston accommodates a valve which is open in its inactive position and permits a connection between the master brake cylinder and the wheel brake. When the auxiliary pump is started, the separating piston is displaced, with the result that the valve shuts off the above-mentioned connection and the pressure fluid conducted by the separating piston causes prefilling of the wheel brakes and precharging of the return pump. A signal representative of the pressure desired by the driver is supplied by a pressure sensor which is connected to the first pressure chamber of the master cylinder.
A disadvantage in the prior art arrangement, however, is the comparatively high technical expenditure needed when using the pressure sensor to achieve the known method.
Therefore, an object of the present invention is to disclose a method of operating an anti-lock automotive vehicle brake system of the type referred to hereinabove which can be achieved in a simple manner and at low cost by using the components which are already provided in the brake system. In particular, the need for the complicated pressure sensor shall be eliminated.
This object is achieved according to the present invention in that, in a control operation, a pressure value is assigned to the output signal of the pedal position sensor which corresponds to the pressure prevailing in the brake circuit that is pressurized responsive to the driver's wish.
In a preferred aspect of the present inv
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Graber Johannes
Romano Nino
ITT Manufacturing Enterprises Inc.
Oberleitner Robert J.
Siconolfi Robert A.
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