Method and apparatus for determining a need for vehicle braking system maintenance
First Claim
1. Apparatus for determining a need for vehicle braking system maintenance in a wheeled vehicle including fluid-actuated brakes having normally operable and automatically operable braking modes, the apparatus comprising:
- means for determining wheel speed and for generating wheel speed signals representative thereof;
means for determining vehicle speed and for generating a vehicle speed signal representative thereof;
calculating means for determining measures of wheel slip for each wheel during periods of vehicle deceleration from data represented by the wheel speed signals and by the vehicle speed signal and for generating wheel slip signals representing the measures of wheel slip determined;
accumulating means for accumulating the measures of wheel slip for each wheel; and
comparing means for comparing the accumulated measures of wheel slip and for generating a maintenance signal in response to a predetermined minimum difference therebetween to indicate the existence of a possible braking system problem.
2 Assignments
0 Petitions
Accused Products
Abstract
Actual performance is used to determine vehicle braking system maintenance requirements. Measures of wheel slip are determined for each wheel of a vehicle during periods of deceleration. The determined measures of wheel slip are accumulated; and those accumulated for left wheels are compared with those accumulated for right wheels of each axially associated set of wheels, those accumulated for one axially associated set of wheels are compared with those accumulated for each of other axially associated sets of wheels, and those accumulated for tractor wheels are compared with those accumulated for trailer wheels. A predetermined difference between measures of wheel slip indicates the existence of a possible problem with the brake associated with the wheel or at least one of the set of wheels for which the least wheel slip is determined.
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Citations
23 Claims
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1. Apparatus for determining a need for vehicle braking system maintenance in a wheeled vehicle including fluid-actuated brakes having normally operable and automatically operable braking modes, the apparatus comprising:
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means for determining wheel speed and for generating wheel speed signals representative thereof; means for determining vehicle speed and for generating a vehicle speed signal representative thereof; calculating means for determining measures of wheel slip for each wheel during periods of vehicle deceleration from data represented by the wheel speed signals and by the vehicle speed signal and for generating wheel slip signals representing the measures of wheel slip determined; accumulating means for accumulating the measures of wheel slip for each wheel; and comparing means for comparing the accumulated measures of wheel slip and for generating a maintenance signal in response to a predetermined minimum difference therebetween to indicate the existence of a possible braking system problem. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for determining a need for vehicle braking system maintenance in a wheeled vehicle including fluid-actuated brakes having normally operable and automatically operable braking modes, the method comprising the steps of:
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applying the brakes to decelerate the vehicle; determining the wheel speed of each wheel; generating wheel speed signals representative thereof; determining vehicle speed; generating a vehicle speed signal representative thereof; determining measures of wheel slip for each wheel during periods of vehicle deceleration from data represented by the wheel speed signals and by the vehicle speed signal; generating wheel slip signals representing the measures of wheel slip determined; accumulating the measures of wheel slip for each wheel; comparing the accumulated measures of wheel slip between left and right wheels of each axially associated set thereof; and generating a brake problem signal in response to a predetermined minimum difference between the accumulated measures of wheel slip of left and right wheels to indicate the existence of a possible problem with the brake associated with the wheel for which the least determined measure of wheel slip has been accumulated. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A system for determining a need for vehicle braking system maintenance in a wheeled vehicle including fluid-actuated brakes having normally operable and automatically operable braking modes, the system comprising:
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means for applying the brakes to decelerate the vehicle; means for determining the wheel speed of each wheel; means for generating wheel speed signals representative thereof; means for determining vehicle speed; means for generating a vehicle speed signal representative thereof; means for determining measures of wheel slip for each wheel during periods of vehicle deceleration from data represented by the wheel speed signals and by the vehicle speed signal; means for generating wheel slip signals representing the measures of wheel slip determined; means for accumulating the measures of wheel slip for each wheel; means for comparing the accumulated measures of wheel slip between left and right wheels of each axially associated set thereof; and means for generating a brake problem signal in response to a predetermined minimum difference between the accumulated measures of wheel slip of left and right wheels to indicate the existence of a possible problem with the brake associated with the wheel for which the least determined measure of wheel slip has been accumulated. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification