Fluid-pressure and analogous brake systems – Speed-controlled – With failure responsive means
Reexamination Certificate
1999-02-19
2001-03-27
Graham, Matthew C. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
With failure responsive means
C303S011000
Reexamination Certificate
active
06206489
ABSTRACT:
BACKGROUND INFORMATION
A publication—SAE (Society of Automotive Engineers) paper 960991—describes a conventional electrohydraulic braking system, in which a driver braking input is derived from the actuation of the brake pedal by the driver. This braking input is converted, in view of further operating variables, into setpoint brake pressures for the individual wheel brakes. The setpoint braking pressures are adjusted for each wheel by closed pressure-control loops on the basis of the predefined setpoint pressure, and of the actual brake pressure measured in the area of the wheel brake. In such braking systems, the braking force at the wheels is adjusted on the basis of electrically controllable valve arrangements as a function of the driver braking input. In this context, special attention must be given to the performance reliability and availability of the system. Therefore, in the above-described publication, during the initialization of the braking system, a so-called predrive check is carried out, during which brake pressure is built up in the wheel brakes and compared to sensor information. A particular form of this predrive check is not described.
One of the objects of the present invention is to provide measures for check-testing a braking system within the framework of a predrive check, by which all necessary components of the braking system can be tested for a correct method of functioning.
SUMMARY OF THE INVENTION
The present invention provides a predrive check for an electronically controllable braking system, during which all necessary components of the braking system can be tested. It is advantageous that during the initialization of the braking system, the wheel calipers are acted upon briefly with pressure according to a definitively predefined pattern, and pressure limiting values are sampled at specific points of time. If the pressure characteristic ascertained in this manner falls characteristically out of the framework, i.e. pressure limiting values are exceeded or undershot, a fault is inferred from this, and the braking system is completely or partially switched off. In this manner, both the performance reliability and the availability of the braking system are significantly improved.
It is also advantageous that both the capability of the system for pressure regulation to different pressure levels in the wheel brakes of one axle, and the build-up to the accumulator pressure level are tested. In this manner, all essential functions of the braking system are checked for correctness.
REFERENCES:
patent: 4085979 (1978-04-01), Leiber et al.
patent: 4484784 (1984-11-01), Leiber
patent: 4824182 (1989-04-01), Steffes et al.
patent: 5713643 (1998-02-01), Esselbrugge et al.
patent: 2-155867 (1990-06-01), None
patent: 4-243655 (1992-08-01), None
W. Jonner et al., “Electrohydraulic Brake System—The First Approach to Brake-By-Wire Technology”, Paper No. 960991, SAE Technical Paper Series, Feb. 1996, pp. 105-112.
Binder Juergen
Gottwick Ulrich
Schmidt Guenther
Winner Hermann
Graham Matthew C.
Kenyon & Kenyon
Robert & Bosch GmbH
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