Fluid-pressure and analogous brake systems – Electric control
Reexamination Certificate
1999-06-11
2001-10-09
Oberleitner, Robert J (Department: 3613)
Fluid-pressure and analogous brake systems
Electric control
C303S122040, C303SDIG009, C318S362000
Reexamination Certificate
active
06299261
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a decentralized electric brake system (brake by wire) for a motor vehicle, which takes into account in particular the high technical demands with regard to safety and availability due to its decentralized designed.
BACKGROUND INFORMATION
A previously proposed electric brake system is described, for example, in German Published Patent Application No. 196 34 567. The brake system described there has a decentralized structure, where a pedal unit to form the reference input variable intended by the driver, optionally a processing unit for taking into account additional functions as well as wheel pair units to control or regulate the controlling elements of the wheel brakes are connected by one or more communication systems. Furthermore, the brake system receives power from at least two on-board electric systems. This guarantees sufficient safety and availability of the brake system. With this known system, wheel pair units are provided, and two wheel brakes are assigned to each unit. The wheel pair units each have essentially two microcomputers which monitor one another. Each microcomputer is assigned to another wheel brake and controls it according to the setpoints. The resulting operating reliability and availability are not optimal for all applications.
SUMMARY OF THE INVENTION
An object of the present invention is to provide measures for optimizing the operating safety and availability of an electric brake system, in particular in the area of wheel brake control units.
The operating safety and availability of the brake system according to the present invention is optimized by assigning each wheel brake a control unit which contains a self-monitoring and control system-monitoring computer system. Each of these wheel units implements control of the wheel brake application force or wheel braking torque for each wheel brake individually.
It is especially advantageous in one embodiment that, due to the redundancy of the communication system connecting the units, the brake function of only one wheel is lost even in the event of a failure in the power source or in a communication system.
It is especially advantageous that monitoring of the sensor for the brake application force or the braking torque of a wheel is made possible. This effectively prevents wheel brake malfunction as a result of a sensor error.
In addition, self-monitoring of proper functioning of the computer system of a wheel unit is provided, implemented by various calculations and a query/response communication between a microcomputer system and a monitoring component.
REFERENCES:
patent: 4546437 (1985-10-01), Bleckmann et al.
patent: 4784442 (1988-11-01), Peterson
patent: 5588719 (1996-12-01), Bailleux
patent: 5952799 (1999-09-01), Maisch et al.
patent: 5954407 (1999-09-01), Schramm et al.
patent: 5961190 (1999-10-01), Brandmeier et al.
patent: 5962931 (1999-10-01), Maron et al.
patent: 19634 567 (1998-03-01), None
Blessing Peter
Weiberle Reinhard
Kenyon & Kenyon
Oberleitner Robert J
Robert & Bosch GmbH
Siconolfi Robert A.
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