US3652136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antiskid brake system for vehicles
Assignee: TDK Micronas GmbH
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Filing: 1970-01-12
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Granted: 1972-03-28
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Expires: 1990-01-12
Abstract
Abstract A vehicle antiskid brake system in which the brake pressure is reduced at one or more wheel deceleration thresholds and the brake pressure is increased when the maximum wheel acceleration is reached. Thus the brakes are reapplied before the wheel has reached the vehicle speed and at a time when the brake force coefficient is greatest. An electronic circuit closes an inlet valve and opens an outlet valve in the brake line to the wheel when the deceleration threshold is reached. Although the outlet valve is closed when the wheel deceleration is reduced to a point above the threshold, a timing circuit keeps the inlet valve closed until a differentiating circuit generates a signal indicating that the acceleration of the wheel has reached a maximum value, whereupon the inlet valve is opened to complete the cycle.
Inventors
- 👤 Erwin Schlitz
- 👤 Werner Fink
- 👤 Gunther Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:14
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
220 words
An anti-skid system for a vehicle having road wheels comprising: a wheel brake assembly associated with at least one of said wheels; first means coupled to said assembly for actuating said assembly; second means coupled to said one of said wheels to generate a single output signal which is proportional to the wheel acceleration; third means coupled to said second means to produce a first control signal when the wheel deceleration becomes less than a given threshold value; fourth means coupled to said third means and said first means to couple said first control signal to said first means for interrupting the braking action of said assembly; fifth means coupled to said first means through said fourth means and directly connected to said third means, said fifth means being activated in response to only said first control signal to maintain the interruption of the braking action of said assembly even when the wheel deceleration exceeds said given threshold value; sixth means directly connected to said second means responsive to said single output signal indicating a maximum wheel acceleration to produce a second control signal; and seventh means directly connected between said sixth means and said fifth means to couple said second control signal directly to said fifth means for deactivation thereof and thereby permit the braking action of said assembly.
Claim 2
Dependent Claim
220 words
An anti-skid system for a vehicle having road wheels comprising: a wheel brake assembly associated with at least one of said wheels; first means coupled to said assembly for actuating said assembly; second means coupled to said one of said wheels to generate a single output signal which is proportional to the wheel acceleration; third means coupled to said second means to produce a first control signal when the wheel deceleration becomes less than a given threshold value; fourth means coupled to said third means and said first means to couple said first control signal to said first means for interrupting the braking action of said assembly; fifth means coupled to said first means through said fourth means and directly connected to said third means, said fifth means being activated in response to only said first control signal to maintain the interruption of the braking action of said assembly even when the wheel deceleration exceeds said given threshold value; sixth means directly connected to said second means responsive to said single output signal indicating a maximum wheel acceleration to produce a second control signal; and seventh means directly connected between said sixth means and said fifth means to couple said second control signal directly to said fifth means for deactivation thereof and thereby permit the braking action of said assembly.
Claim 3
Dependent Claim
14 words
A system according to claim 1, wherein said sixth means includes a differentiating circuit.
Claim 4
Dependent Claim
20 words
A system according to claim 1, wherein said third means, said fifth means and said sixth means are electronic circuits.
Claim 5
Dependent Claim
42 words
A system according to claim 1, wherein said first means includes a master cylinder, a normally open electromagnetic inlet valve disposed between said assembly and said master cylinder permitting communication therebetween, and a normally closed electromagnetic outlet valve coupled to said assembly.
Claim 6
Dependent Claim
52 words
A system according to claim 4, wherein said fourth means includes: a first amplifier coupled to said inlet valve and in common to the outPut of said third means and the output of said fifth means, and a second amplifier coupled between the output of said third means and said outlet valve.
Claim 7
Dependent Claim
100 words
A system according to claim 4, wherein said inlet valve responds to the presence of said first control signal to prevent communication between said master cylinder and said assembly and to the output signal of said fifth means until deactivated to continue the prevention of communication between said master cylinder and said assembly, and said outlet valve responds to the presence of said first control signal to open the outlet from said assembly and to the absence of said first control signal when the wheel deceleration becomes greater than said given threshold value to close the outlet from said assembly.
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) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |