Fluid-pressure and analogous brake systems – Electric control
Reexamination Certificate
1998-12-09
2001-07-24
Butler, Douglas C. (Department: 3613)
Fluid-pressure and analogous brake systems
Electric control
C188S158000, C303S003000, C303S199000
Reexamination Certificate
active
06264289
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle braking system, and more particularly a brake system in which brake operation is electronically regulated in accordance with various braking criteria.
An electronically controlled vehicle braking system of this type, also referred to by the abbreviated term “EBS”, is disclosed for example in European Patent Application EP 0 798 615 A1. In such EBS, initiation and desired degree of a braking action by a driver is transmitted in the form of a brake value signal to braking system electronics, which then correspondingly regulate actuation of the vehicle braking system in accordance with the driver's intentions.
In addition, the braking system electronics are often designed to ensure a directionally stable braking behavior of the vehicle, antiskid protection and uniform brake wear. For this purpose, additional signals are therefore processed by the braking system electronics, such as for example, wheel speed signals received from sensors provided as part of the braking system and/or transmitted via a vehicle data bus. It is furthermore common practice to design the braking system electronics to provide drive slip control (DSC) by controlled actuation of the braking system when the wheel speed sensors indicate a spinning tendency on at least one driven wheel.
In the disclosed EBS, yawing speed sensors, a steering angle sensor, and a transverse acceleration sensor transmit signals, in addition to the above mentioned wheel speed signals, to an electronic travel dynamics system of the vehicle braking system. The electronic travel dynamics system monitors the vehicle transverse stability in every travel state of the vehicle, determining the tendency of the vehicle to skid based upon the values of the received signals, and controls the vehicle braking system, or intervenes in its control through the braking system electronics in a manner consistently ensuring optimal transverse stability of the vehicle.
Although describing the physical principles attendant such an EBS vehicle braking system and the basic operation thereof, the above-mentioned EP publication fails to provide guidance regarding effective solutions and arrangement possibilities of the components required to realize the braking system in practice.
It is therefore the object of the present invention to propose advantageous solutions and arrangements of the components of such an EBS which may be implemented in a practical manner.
SUMMARY OF THE INVENTION
In accordance with these and other objects of the invention, there is provided a vehicle braking system in which travel dynamics electronics are integrated with other operational components of the electrically controlled vehicle braking system.
In an embodiment of the invention a vehicle braking system includes braking system electronics and travel dynamics electronics, brake actuation being controllable by the braking system, electronics at least following the indication of a brake value signal and by travel dynamics electronics on the basis of signals including wheel speed signals and signals from a steering angle sensor, a yawing speed sensor and a transverse acceleration sensor. The braking system electronics can be connected via a vehicle data bus at least to engine control electronics. In accordance with the embodiment, the travel dynamics electronics being integrated with the braking system electronics.
Another embodiment provides the integration of a yawing speed sensor and a transverse acceleration sensor with the travel dynamics electronics.
In another advantageous embodiment, the travel dynamics electronic system is connected to the vehicle data bus connecting the braking system electronics to at least the engine control electronics.
The above, and other objects, features and advantages of the present invention will become apparent from the following description read in conjunction with the accompanying drawings, in which like reference numerals designate elements having common function, and in which thick lines are used for compressed-air connections, and tinner lines for electrical control or signal conductors.
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Franke Torsten
Gläbe Klaus
Klein Bodo
Koschorek Ralf
Petersen Erwin
Butler Douglas C.
Proskauer Rose LLP
WABCO GmbH
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