Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-06-12
1999-07-06
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
B60T 834
Patent
active
059189487
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
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, including a pneumatic brake power booster operable irrespective of the driver's wish and a master brake cylinder connected downstream of the brake power booster, the pressure chambers of the master brake cylinder being connected to wheel brakes associated with the individual vehicle wheels by way of an ABS hydraulic unit having a return pump.
German patent No. 42 08 496 discloses a brake system, wherein the brake power 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 permitting 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 patent referred to hereinabove does not provide any specific indications as to how the described brake system could be used for driving stability control.
German patent application No. 42 32 311 discloses a hydraulic vehicle brake system with an anti-lock control device having an auxiliary-pressure source for the improvement of the vehicle directional stability, in particular when cornering, by automatic braking. The auxiliary-pressure source 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 throttle and an auxiliary-pressure limiting valve, is connected to an inlet port of one hydraulic cylinder each. The hydraulic cylinder is connected to the connection between the outlet of an actuating unit, comprised of a brake power booster and a master cylinder inserted downstream of the master cylinder, and the ABS hydraulic unit or the wheel brake. A second inlet of the cylinder is connected to the master brake cylinder, and a separating piston which can be acted upon by auxiliary pressure is guided in the cylinder. 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 closes the above-mentioned connection and the pressure fluid volume conducted by the separating piston causes prefilling of the wheel brakes and precharging of the return pump.
A disadvantage of this brake system is, however, the comparatively extensive technical effort and structure required to achieve the known method.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to disclose a method of operating an anti-lock automotive vehicle brake system of the previously mentioned type which permits being achieved in a simple and low-cost manner by use of component parts which are already provided in the brake system.
A first objective achieved by the present invention involves the actuation of the brake power booster irrespective of the driver's wish upon commencement of the control to prefill the wheel brakes, and the further pressure increase in the wheel brakes is carried out by way of the return pump after completion of the prefilling action.
To measure the hydraulic pressure, introduced by the driver, by way of low-cost pressure sensors, it is favorable that after prefilling of the wheel brakes, the actuation of the brake power booster irrespective of the driver's wish (independent actuation) is deactivated.
In another aspect of the present invention, a favorable supply of the return pump with pressure fluid is achieved because the actuation of the brake power booster ir
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Burgdorf Jochen
Drumm Stefan
Graber Johannes
Kircher Dieter
ITT Manufacturing Enterprises Inc.
Oberleitner Robert J.
Talavera Melanie
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