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Method for determining the response pressure of motor vehicle brakes using a test pressure
| Details |
Inventors: Frank, Peter;
Assignee: Knorr-Bremse Systeme fuer Nutzfahrzeuge GmbH (Munich, DE)
Primary Examiner: Oen; William
Assistant Examiner:
Attorney, Agent or Firm: Crowell & Moring LLP
The invention relates to a method for determining the response pressure of motor vehicle brakes, according to which the brakes to be inspected are subjected to a test pressure, whereby before and after the creation of the test pressure, a test-pressure indicator signal is generated, which is a linear combination of an acceleration signal and a differential speed signal. If the two test-pressure indicator signals correspond, (considered to be a "non-response of the brakes"), the test-pressure is increased and a new test-pressure indicator signals do not correspond, the prevailing brake pressure is considered to be the response pressure. |
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DETAILED DESCRIPTION The present invention relates to a method for determining the response pressure of vehicle brakes particularly a road vehicle, by a) admitting a test pressure to the brakes to be examined, with and without test pressure, b) measuring rotational wheel speed signals at at least two axles of the vehicle, c) from measured rotational wheel speed signals, determining an acceleration signal, and d) after the application of the test pressure, determining the brake pressure at the brake or brakes to be examined.
A device for determining the response pressure of the brakes of a vehicle is also provided.
A method of the above-mentioned type is known from European Patent Document EP 0 733 532 A2.
In the case of a vehicle brake system, a certain minimal brake pressure must be exceeded to generate a braking force.
This minimal brake pressure is called the "response pressure".
A vehicle braking system normally has several brakes, which may have different response pressures.
This results in an undesirably high wear on the first-responding brakes.
The wear problems are particularly significant when a towing vehicle is coupled with different trailers because the amount of the response pressure of individual vehicles depends on the individual restoring forces and the mechanical friction between individual brake components.
The determination of the response pressure may take place, for example, on a roller-type test stand which, however, is relatively cumbersome.
From the above-mentioned European Patent Document EP 0 733 532 A2, a method is known in which the response pressure is determined during the drive, specifically by analyzing the vehicle acceleration.
From rotational wheel speed signals, first a possibly existing vehicle deceleration is determined, which is called a "basic vehicle deceleration" and is caused, for example, by wind resistance, frictional forces or a slope inclination.
Subsequently, the brake to be checked or the group of brakes to be checked are acted upon by a test pressure and the test vehicle deceleration which will then occur is determined
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Navigation and GPS 
