Method for determining the response pressure of motor vehicle brakes using a test pressure
First Claim
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1. A method for determining a response pressure of brakes of a vehicle, the method comprising the acts of:
- a) admitting a test pressure to the brakes to be examined;
b) measuring rotational wheel speed signals at at least two axles of the vehicle;
c) from the measured rotational wheel speed signals, determining an acceleration signal;
d) after applying the test pressure to the brakes to be examined, determining a brake pressure at the brakes to be examined;
e) in each case, for a driving condition with and without applying the test pressure, forming a differential speed signal(s) as a function of a difference between rotational wheel speed signals of a powered and of a non-powered axle;
f) forming test pressure indicator signals, respectively, each as a function of the acceleration signal and the differential speed signal; and
g) comparing two test pressure indicator signals formed, and repeating steps (a)-(f) with an increased test pressure when the two test pressure indicator signals coincide, and emitting the applied test pressure when the two test pressure indicator signals do not coincide.
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Abstract
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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Citations
16 Claims
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1. A method for determining a response pressure of brakes of a vehicle, the method comprising the acts of:
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a) admitting a test pressure to the brakes to be examined;
b) measuring rotational wheel speed signals at at least two axles of the vehicle;
c) from the measured rotational wheel speed signals, determining an acceleration signal;
d) after applying the test pressure to the brakes to be examined, determining a brake pressure at the brakes to be examined;
e) in each case, for a driving condition with and without applying the test pressure, forming a differential speed signal(s) as a function of a difference between rotational wheel speed signals of a powered and of a non-powered axle;
f) forming test pressure indicator signals, respectively, each as a function of the acceleration signal and the differential speed signal; and
g) comparing two test pressure indicator signals formed, and repeating steps (a)-(f) with an increased test pressure when the two test pressure indicator signals coincide, and emitting the applied test pressure when the two test pressure indicator signals do not coincide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for determining a response pressure of at least one brake of a vehicle to be examined, the method comprising the acts of:
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generating a test pressure indicating signal both before and after a test pressure is admitted to the brake to be examined, wherein the test pressure indicating signal is a linear combination of an acceleration signal and a differential speed signal; and
if the test pressure indicator signals correspond to one another within a tolerance band, an increased test pressure is admitted and a new test pressure indicator signal is generated; and
if the test pressure indicator signals do not correspond, then an existing brake pressure is considered to be the response pressure if the difference between the two test pressure indicator signals exceeds a defined limit value.
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Specification
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Current AssigneeKnorr-Bremse Systeme Fur Nutzfahrzeuge GMBH (Estate of Heinz Hermann Thiele)
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Original AssigneeKnorr-Bremse Systeme Fur Nutzfahrzeuge GMBH (Estate of Heinz Hermann Thiele)
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InventorsFrank, Peter
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Primary Examiner(s)OEN, WILLIAM L
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Application NumberUS10/307,514Publication NumberTime in Patent Office617 DaysField of Search731/21--32, 73/15.7, 73/17.9, 737/00, 737/14, 737/56US Class Current73/121CPC Class CodesB60T 13/662 characterised by specified ...B60T 17/22 Devices for monitoring or c...B60T 8/00 Arrangements for adjusting ...
