US4937554A
Expired / Lapsed
US
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Electronic brake monitoring system and method
Assignee: Paccar Inc
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Filing: 1989-05-22
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Granted: 1990-06-26
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Expires: 2009-05-22
Abstract
Abstract A brake monitoring system for a motorized vehicle having fluid brakes including a pressurized fluid chamber and brake engaging apparatus. Sensors are provided to measure the required fluid pressure exerted by the fluid chamber on the engaging apparatus to bring about braking of the vehicle. Measurement is also made of the distance the engaging apparatus is extended from the fluid chamber in braking. Apparatus is further provided to determine from the measured fluid pressure and measured engaging distance whether the brakes are properly adjusted.
Inventors
- 👤 Mark N. Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:17
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60Q; B60Q1/00; B60Q1/26; B60Q1/44; B60T13/00; B60T13/10; B60T13/66; F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/60; F16D66/00; F16D66/02; F16D66/021; F16D66/022; F16D66/025
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
133 words
In a braking system for a motorized vehicle having at least one fluid brake including a brake engaging means and a pressurized fluid chamber exerting fluid pressure on said engaging means to cause the engaging means to extend forward upon actuation of a brake pedal in order to exert pressure on a braking means that is connected to the engaging means, the improvement comprising: means for sensing the fluid pressure exerted by the fluid chamber on the engaging means in order to cause the engaging means to extend forward toward the braking means; means for measuring the distance the engaging member is extended from the fluid chamber toward the braking means; and means for determining from said sensed fluid pressure and said measured engaging means distance the adjustment status of said fluid brake.
Claim 2
Dependent Claim
133 words
In a braking system for a motorized vehicle having at least one fluid brake including a brake engaging means and a pressurized fluid chamber exerting fluid pressure on said engaging means to cause the engaging means to extend forward upon actuation of a brake pedal in order to exert pressure on a braking means that is connected to the engaging means, the improvement comprising: means for sensing the fluid pressure exerted by the fluid chamber on the engaging means in order to cause the engaging means to extend forward toward the braking means; means for measuring the distance the engaging member is extended from the fluid chamber toward the braking means; and means for determining from said sensed fluid pressure and said measured engaging means distance the adjustment status of said fluid brake.
Claim 3
Dependent Claim
35 words
The braking system of claim 1 wherein the fluid pressure sensing means comprises a fluid pressure transducer which creates an electrical signal proportional to the amount of fluid pressure being supplied to the fluid chamber.
Claim 4
Dependent Claim
53 words
The braking system on claim 2 wherein the distance measuring means comprises an electromagnetic sensor for measuring the distance the engaging means has travelled by measuring the displacement in the braking means, said distance measuring means creating an electrical signal proportional to the distance the engaging means is extended from the fluid chamber.
Claim 5
Dependent Claim
45 words
The braking system of claim 3 wherein the determining means comprises a microprocessor having a table of corresponding fluid pressures and engaging means distances, said microprocessor determining from said table brake adjustment status based on a corresponding measurement of fluid pressure and engaging means distance.
Claim 6
Dependent Claim
110 words
A braking system for a motorized vehicle having at least one fluid brake including a pressurized fluid chamber which extends a pushrod that exerts pressure on a slack adjuster activating a braking means that is connected to the slack adjustor, comprising: means for sensing the fluid pressure exerted by the fluid chamber on said pushrod causing said pushrod to be extended toward the slack adjuster; means for measuring the distance the pushrod is extended from said fluid chamber toward said slack adjustor, moving said slack adjuster by a like amount; and means for determining from said sensed fluid pressure and measured pushrod distance whether said brake is out of adjustment.
Claim 7
Dependent Claim
110 words
A braking system for a motorized vehicle having at least one fluid brake including a pressurized fluid chamber which extends a pushrod that exerts pressure on a slack adjuster activating a braking means that is connected to the slack adjustor, comprising: means for sensing the fluid pressure exerted by the fluid chamber on said pushrod causing said pushrod to be extended toward the slack adjuster; means for measuring the distance the pushrod is extended from said fluid chamber toward said slack adjustor, moving said slack adjuster by a like amount; and means for determining from said sensed fluid pressure and measured pushrod distance whether said brake is out of adjustment.
Claim 8
Dependent Claim
35 words
The braking system of claim 5 wherein the fluid pressure sensing means comprises a fluid pressure transducer which creates an electrical signal proportional to the amount of fluid pressure being supplied to the fluid chamber.
Claim 9
Dependent Claim
51 words
The braking system on claim 6 wherein the distance measuring means comprises an electromagnetic sensor for measuring the distance the pushrod has travelled by measuring the displacement in the slack adjuster, said distance measuring means creating an electrical signal proportional to the distance the pushrod is extended from the fluid chamber.
Claim 10
Dependent Claim
13 words
The braking system of claim 7 wherein the determining means comprises a microprocessor.
Claim 11
Dependent Claim
85 words
The braking system of claim 7 wherein the determining means further comprises: means for converting the proportional electrical signals from the sensing means and the measuring means into digital signals; means for tabulating the digital fluid pressure signal along one axis of a table in increasing order; means for tabulating the digital pushrod distance along another axis of the table in increasing order; and means for determining for each corresponding measurement of fluid pressure and pushrod distance in the table whether the brake is adjusted.
Claim 12
Dependent Claim
11 words
The braking system of claim 5 wherein the fluid is air.
Claim 13
Dependent Claim
116 words
An electronic braking system for a motorized vehicle having air brakes, the air brakes including a pressurized air chamber having a pushrod which exerts pressure on a slack adjuster turning the slack adjuster which is connected to a braking member, whereby the braking member is placed in contact with a brake drum causing the motorized vehicle to brake, comprising: means for sensing the air pressure exerted by the air chamber on the pushrod to extend the pushrod; means for measuring the distance the pushrod is extended from the air chamber; means for tabulating said sensed air pressure and measured pushrod distance; and means for determining from said tabulation whether the air brakes are out of adjustment.
Claim 14
Dependent Claim
116 words
An electronic braking system for a motorized vehicle having air brakes, the air brakes including a pressurized air chamber having a pushrod which exerts pressure on a slack adjuster turning the slack adjuster which is connected to a braking member, whereby the braking member is placed in contact with a brake drum causing the motorized vehicle to brake, comprising: means for sensing the air pressure exerted by the air chamber on the pushrod to extend the pushrod; means for measuring the distance the pushrod is extended from the air chamber; means for tabulating said sensed air pressure and measured pushrod distance; and means for determining from said tabulation whether the air brakes are out of adjustment.
Claim 15
Independent Claim
121 words
A method of braking for a motorized vehicle having at least one fluid brake including a pressurized fluid chamber having an engaging means which exerts pressure on a braking means that is connected to the engaging means, whereby brake shoes of the braking means are placed in contact with a brake drum causing the motorized vehicle to brake, comprising the steps of: sensing the fluid pressure exerted by the fluid chamber on the engaging means causing the engaging means to be extended toward the braking means; measuring the distance the engaging member is extended from the fluid chamber toward the braking means; and determining from said sensed fluid pressure and measured engaging means distance whether the brake is out of adjustment.
Claim 16
Independent Claim
121 words
A method of braking for a motorized vehicle having at least one fluid brake including a pressurized fluid chamber having an engaging means which exerts pressure on a braking means that is connected to the engaging means, whereby brake shoes of the braking means are placed in contact with a brake drum causing the motorized vehicle to brake, comprising the steps of: sensing the fluid pressure exerted by the fluid chamber on the engaging means causing the engaging means to be extended toward the braking means; measuring the distance the engaging member is extended from the fluid chamber toward the braking means; and determining from said sensed fluid pressure and measured engaging means distance whether the brake is out of adjustment.
Claim 17
Dependent Claim
41 words
The method of braking of claim 12 wherein the step of fluid pressure sensing comprises the step of providing a fluid pressure transducer which creates an electrical signal proportional to the amount of fluid pressure being supplied to the fluid chamber.
Claim 18
Dependent Claim
51 words
The method of braking of claim 13 wherein the step of distance measuring comprises the step of providing an electromagnetic sensor for measuring the distance the engaging means has travelled, said distance measuring means creating an electrical signal proportional to the distance the engaging means is extended from the fluid chamber.
Claim 19
Dependent Claim
48 words
The method of braking of claim 14 wherein the step of determining comprises the steps of tabulating the fluid pressure signal and the engaging means distance signal and designating for each corresponding measurement of fluid pressure and engaging means distance in the table whether the brake is adjusted.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |