Brakes – Operators – Fluid pressure
Reexamination Certificate
1998-03-23
2001-02-27
Mar, Michael (Department: 3613)
Brakes
Operators
Fluid pressure
Reexamination Certificate
active
06193031
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a process of bleeding a slip-controlled dual-circuit brake system for automotive vehicles, and a device for implementing the process.
Slip-controlled automotive vehicle brake systems usually have an extensive system of bores for pressure-fluid conveying channels in a housing which render the filling and bleeding difficult. Frequently, high vacuum engineering is used, especially during the final assembly of the automotive vehicle on the assembly line. However, there are cases where the use of high vacuum engineering is impossible and the brake system must be filled and bled in a conventional scavenging process. This process entails considerable effort with respect to the single working steps required, because pre-bleeding, main-bleeding and after-bleeding phases are required during which the brake pedal in total must be operated by 200 strokes approximately.
Therefore, an object of the present invention is to develop a process of bleeding slip-controlled dual-circuit brake systems for automotive vehicles which is simple in application, to which end a device for implementing the bleeding process shall be presented which permits being used in the manufacture of vehicles and in workshops.
SUMMARY OF THE INVENTION
According to the present invention, this object is achieved by a process in which bleeding of the wheel brakes is executed in two sequences of operation: in a first sequence of operation, the wheel brakes of the front axle and the rear axle are pre-bled by a cyclic actuation of the braking pressure generator, and in the second sequence of operation the main bleeding and filling of the front-wheel and rear-wheel brakes is executed by actuating cycles of the braking pressure generator, the pressure modulation valves and start of operation of the pump. A device for carrying out the process includes a control device for activating the braking pressure generator, the pressure modulation valves and the pump, which is adapted to be linked in terms of circuitry to a diagnosis unit of the actuation and control electronics of the brake system.
Further details of the present invention will be explained in detail hereinbelow by way of an embodiment.
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Bremsen-Handbuch, Autohaus-Verlag GmbH, Ottobrunn bei München, 1988, S.278-280.
Baechle Martin
Schiffer Hans-Ulrich
Schmitt Stefan A.
ITT Manufacturing Enterprises Inc.
Mar Michael
Rader & Fishman & Grauer, PLLC
Sy Marlano
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