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US4964679A
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Monitoring method and apparatus for a brake system of heavy-duty vehicles
Assignee: ZF International UK Ltd
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Filing: 1989-02-23
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Granted: 1990-10-23
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Expires: 2009-02-23
Abstract
Abstract A method of and an apparatus for controlling a brake system in a heavy-duty vehicle provide for continuously measuring parameters which are characteristics of the state of the vehicle, such as the velocity of the vehicle, the inclination of the roadway, the axle load, and the transverse acceleration. Furthermore, the braking capability is being monitored continuously. To that end the temperature of the brakes, their condition of wear, the state of a compressed air reservoir, and the tire pressure are measured. For any given state of the vehicle and brakes it is determined whether or not the stopping distance to be expected will be longer than a predetermined rated stopping distance. If that is so, the driver is warned and/or a reduction of the travelling speed is initiated automatically.
Inventors
- 👤 Heinrich-Bernhard Rath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:25
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; B60T8/266; B60T8/268; B60K; B60K31/00; B60K31/02; B60T8/17; B60T8/1701; B60T8/1708; F; F16; F16D; F16D66/00; F16D66/02; F16D66/021; B60G; B60G2600/00; B60G2600/04; B60G2800/00; B60G2800/01; B60G2800/012; B60G2800/0124; B60G2800/24; B60G2800/70; B60G2800/90; B60G2800/91; B60G2800/912; B60G2800/9124; B60G2800/92; B60G2800/922; F16D2066/001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
A method of monitoring a brake system in a heavy-duty vehicle, the method comprising the steps of measuring the velocity (V) of the vehicle, measuring the inclination (N) of the roadway, measuring the axle load (A), measuring the transverse acceleration (Q) of the vehicle, measuring the temperature (T) of the brakes, measuring the condition of wear (S) of the brakes, measuring the condition (P) of a brake pressure source, and measuring the tire pressure (P R ) of the tires of the vehicle, and determining on the basis of said measured velocity (V), inclination (N), axle load (A), transverse acceleration (Q), temperature (T), wear (S), condition (P) of a brake pressure source, and tire pressure (P R ), a stopping distance (X ist ) to be expected, comparing said stopping distance (X ist ) to be expected with a maximum permissible stopping distance (X soll ), and generating a warning signal if said stopping distance (X ist ) to be expected exceeds said maximum permissible stopping distance (X soll ).
Claim 2
Independent Claim
170 words
A method of monitoring a brake system in a heavy-duty vehicle, the method comprising the steps of measuring the velocity (V) of the vehicle, measuring the inclination (N) of the roadway, measuring the axle load (A), measuring the transverse acceleration (Q) of the vehicle, measuring the temperature (T) of the brakes, measuring the condition of wear (S) of the brakes, measuring the condition (P) of a brake pressure source, and measuring the tire pressure (P R ) of the tires of the vehicle, and determining on the basis of said measured velocity (V), inclination (N), axle load (A), transverse acceleration (Q), temperature (T), wear (S), condition (P) of a brake pressure source, and tire pressure (P R ), a stopping distance (X ist ) to be expected, comparing said stopping distance (X ist ) to be expected with a maximum permissible stopping distance (X soll ), and generating a warning signal if said stopping distance (X ist ) to be expected exceeds said maximum permissible stopping distance (X soll ).
Claim 3
Dependent Claim
29 words
A method according to claim 1, characterized in that said maximum permissible stopping distance (X soll ) is varied in response to said measured velocity (V) of the vehicle.
Claim 4
Dependent Claim
76 words
A method according to claim 1, characterized in that the method further comprises determining on the basis of said measured inclination (N), axle load (A), transverse acceleration (Q), temperature (T), wear (S), condition (P) of brake pressure source, and tire pressure (P R ) a maximum rated vehicle speed at which the expected stopping distance (X ist ) does not exceed the maximum permissible stopping distance (X soll ) and indicating said maximum rated vehicle speed.
References Cited (Backward Citations)
US3549212A
Cited
US3791702A
Cited
US3800904A
Cited
US4079802A
Cited
US3893330A
Cited
US4076330A
Cited
US4170274A
Cited
US4110732A
Cited
US4229727A
Cited
US4402047A
Cited
US4484280A
Cited
US4419654A
Cited
US4796716A
Cited
US4610483A
Cited
US4797826A
Cited
US4685745A
Cited
US4790606A
Cited
US4779447A
Cited
US4779202A
Cited
US4811808A
Cited
US4843553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |