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US3937525A
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US
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Control system providing a variable impulse-like brake release and/or reapplication signal for wheel slip control
Assignee: WABCO WESTINGHOUSE GmbH
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Filing: 1974-02-25
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Granted: 1976-02-10
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Expires: 1994-02-25
Abstract
Abstract An anti-wheel skid brake control system including a control circuit for providing an impulse-like control current in accordance with which electro-magnetic control valves are operated to either release or reapply brake pressure in an intermittent fashion. The impulse-like control current displays a predetermined pulse form that may vary in duration and interval with different stages of a digital counter whose output is continuously monitored by a decoding logic network. The variable, impulse-like control current provides for a gradual change in the brake pressure during the final stage of brake release or reapplication during a wheel skid to accordingly avoid overshooting of the brake release or reapplication pressure.
Inventors
- 👤 Dieter Luhdorff
- 👤 Bernd Oehlerking
- 👤 Hugo Jaworsky
- 👤 Gerhard Koth
- 👤 Klaus-P. Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:47
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
An anti-wheel skid brake control system for a vehicle comprising: a signaling means for evaluating the dynamic behavior of a wheel of said vehicle and providing brake pressure release and reapplication signals when certain chosen conditions of wheel rotation have been detected; b valve means for controlling modulation of fluid brake pressure; and c control circuit means for providing an impulselike control signal to effect intermittent operation of said valve means in response to either one of said release and reapplication signals being provided, said control circuit means comprising: i a pulse generator for emitting a predetermined impulse frequency; ii a digital counter driven in accordance with the impulse frequency of said pulse generator; and iii decoding means for interrogating the output of said digital counter and emitting said impulse-like control signal so as to vary the duration of respective pulses of said control signal according to different pulse ranges of said impulse frequency, said control signal being characterized by a waveform displaying a predetermined irregular pulse pattern.
Claim 2
Dependent Claim
168 words
An anti-wheel skid brake control system for a vehicle comprising: a signaling means for evaluating the dynamic behavior of a wheel of said vehicle and providing brake pressure release and reapplication signals when certain chosen conditions of wheel rotation have been detected; b valve means for controlling modulation of fluid brake pressure; and c control circuit means for providing an impulselike control signal to effect intermittent operation of said valve means in response to either one of said release and reapplication signals being provided, said control circuit means comprising: i a pulse generator for emitting a predetermined impulse frequency; ii a digital counter driven in accordance with the impulse frequency of said pulse generator; and iii decoding means for interrogating the output of said digital counter and emitting said impulse-like control signal so as to vary the duration of respective pulses of said control signal according to different pulse ranges of said impulse frequency, said control signal being characterized by a waveform displaying a predetermined irregular pulse pattern.
Claim 3
Dependent Claim
29 words
The system as recited in claim 1, further characterized in that the intervals between pulses of said control signal vary according to different pulse ranges of said impulse frequency.
Claim 4
Dependent Claim
57 words
The system as recited in claim 2, further characterized in that successive pulses of said control signal decrease in duration and said pulse intervals increase in duration as said output of said counter increases to thereby decrease the intermittent operation of said valve means so long as either one of said release and reapplication signals is present.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |