Method of brake lining wear detection using temperature sensing
First Claim
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1. A method of brake lining wear detection based on a measured temperature of the brake lining upon application of a brake comprising:
- detecting application of said brake and generating an application signal;
transmitting said application signal to a processing unit;
measuring a brake lining temperature of said brake lining during transmission of said application signal;
recording said lining temperature in said processing unit; and
calculating a thickness of said brake lining based on said lining temperature within said processing unit according to the relationship;
L∝
t where L is said thickness of said brake and t is the time required for said lining temperature to increase from a given low temperature to a given high temperature upon application of said brake; and
averaging said lining thickness over several braking applications.
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Abstract
A method for detection of wear of a brake lining using a temperature sensor embedded in a brake lining adjacent to a brake table. A temperature versus time history recorded upon application of the brake system is transmitted to a microprocessor based processing unit which estimates the thickness of the remaining brake lining based on comparison with calibration data stored in the processing unit.
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Citations
10 Claims
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1. A method of brake lining wear detection based on a measured temperature of the brake lining upon application of a brake comprising:
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detecting application of said brake and generating an application signal; transmitting said application signal to a processing unit; measuring a brake lining temperature of said brake lining during transmission of said application signal; recording said lining temperature in said processing unit; and calculating a thickness of said brake lining based on said lining temperature within said processing unit according to the relationship;
L∝
t where L is said thickness of said brake and t is the time required for said lining temperature to increase from a given low temperature to a given high temperature upon application of said brake; andaveraging said lining thickness over several braking applications.
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2. The method of brake lining wear detection of claim 1, wherein said temperature of said brake lining is measured with a thermocouple.
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3. The method of brake lining wear detection of claim 1, wherein said temperature of said brake lining is measured with a thermistor.
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4. The method of brake wear detection of claim 1, wherein said temperature of said brake lining is measured with a temperature sensitive device positioned in said brake lining substantially adjacent to a brake table, said brake lining bonded to said brake table.
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5. The method of brake wear detection of claim 1, further comprising averaging said lining temperature in said processing unit.
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6. A method of brake lining wear detection based on a measured temperature of a brake lining upon application of a brake comprising:
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creating a set of calibration standards in a table contained within a processing unit based on a predetermined relationship between a thickness of said brake lining and a lining temperature and an application time; measuring said application time of said brake;
measuring said lining temperature of said brake lining during said application time; andtransmitting said lining temperature to said processing unit; estimating said lining thickness based upon said calibration standards and said lining temperature and said application time.
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7. A method of brake lining wear detection based on a measured temperature of the brake lining upon application of a brake comprising:
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detecting application of a brake; measuring a lining temperature of said brake lining and an associated time period after said application of said brake; averaging said lining temperature with a prior lining temperature which occurred at an equivalent associated time period; and calculating a lining thickness based on said lining temperature and said time period according to the equation;
##EQU19## where L is said lining thickness and Δ
T is the change in lining temperature over a time period Δ
t measured during said application of said brake.
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8. The method of brake lining wear detection of claim 7 wherein a temperature sensitive device is embedded within said brake lining to provide a measurement of said lining temperature.
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9. The method of brake lining wear detection of claim 7 further comprising averaging the lining thickness over several brake applications.
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10. A method of estimating the thickness of a brake lining comprising:
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storing a plurality of calibration curves in a processing unit, said calibration curves representing a relationship between a brake lining temperature and an elapsed application time for a given brake lining thickness; detecting application of a brake; measuring said brake lining temperature during said application of said brake; comparing said brake lining temperature during said application of said brake with said calibration curves; and estimating said brake lining thickness.
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Specification