Patent US3756663A successfully refreshed from Google Patents.
US3756663A
Expired / Lapsed
US
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Anti-skid system
Assignee: TDK Micronas GmbH
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Filing: 1971-12-08
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Granted: 1973-09-04
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Expires: 1991-12-08
Abstract
Abstract This relates to an electronic control system for an anti-skid system having one braking pressure control valve actuated by the control system to regulate the braking pressure applied to the wheel brakes of both wheels of one axle of a vehicle. The control system includes a speed sensor associated with each wheel. A reacceleration detector, an incipient skid deceleration detector and a speed decrease detector is coupled to each sensor and a subtractor is coupled to both sensors. A first series circuit including a first AND gate and a first time delay device is coupled to one of the incipient skid deceleration detectors and one of the speed decrease detectors. A second series circuit including a second AND gate and a second time delay device is coupled to the other of the incipient skid deceleration detectors and the other of the speed decrease detectors. First logic circuitry is coupled to each of the time delay devices and the subtractor to produce a first actuation signal for the control valve to release the braking pressure in both wheel brakes when both of the incipient skid deceleration detectors and both of the speed decrease detectors having an output signal or when the subtractor has an output signal, one of the incipient skid deceleration detectors has an output signal and one of the speed decrease detectors has an output signal. Second logic circuitry is coupled to each of the time delay devices and each of the reacceleration detectors to produce a second actuation signal for the control valve to reapply braking pressure to both wheel brakes when both of the reacceleration detectors have an output signal and both of the time delay devices have an output signal, or when one of the time delay devices has had no output signal and the other of the time delay devices has had an output signal and the associated one of the reacceleration detectors has an output signal.
Inventors
- 👤 W Fink
- 👤 E Schlitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:58
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1764
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
288 words
An anti-skid system for a motor vehicle comprising: a single brake pressure control means to control the braking of both wheels of at least one axle of said vehicle; and an electronic control system to produce at least a first actuation signal for said control means to release brake pressure at both of said wheels to prevent the skidding of at least one of said wheels; said control system including a pair of speed sensors, a different one of said sensors being coupled to each wheel of said one axle, a subtractor coupled to each of said sensors to produce a first signal proportional to the difference in speed signals generated by both of said sensors, a first incipient skid deceleration detector coupled to one of said sensors to produce a second signal proportional to an incipient skid deceleration signal of one of said wheels, a second incipient skid deceleration detector coupled to the other of said sensors to produce a third signal proportional to an incipient skid deceleration signal of the other of said wheels, a first speed decrease detector coupled to one of said sensors to produce a fourth signal proportional to a given decrease in one of said speed signals after said second signal is produced, a second speed decrease detector coupled to the other of said sensors to produce a fifth signal proportional to a given decrease in the other of said speed signals after said third signal is produced, and first logic circuitry coupled to said subtractor, said first and second deceleration detectors and said first and second decrease detectors to produce said first actuation signal in response to a combination of signals selected from said first, second, third, fourth and fifth signals.
Claim 2
Dependent Claim
288 words
An anti-skid system for a motor vehicle comprising: a single brake pressure control means to control the braking of both wheels of at least one axle of said vehicle; and an electronic control system to produce at least a first actuation signal for said control means to release brake pressure at both of said wheels to prevent the skidding of at least one of said wheels; said control system including a pair of speed sensors, a different one of said sensors being coupled to each wheel of said one axle, a subtractor coupled to each of said sensors to produce a first signal proportional to the difference in speed signals generated by both of said sensors, a first incipient skid deceleration detector coupled to one of said sensors to produce a second signal proportional to an incipient skid deceleration signal of one of said wheels, a second incipient skid deceleration detector coupled to the other of said sensors to produce a third signal proportional to an incipient skid deceleration signal of the other of said wheels, a first speed decrease detector coupled to one of said sensors to produce a fourth signal proportional to a given decrease in one of said speed signals after said second signal is produced, a second speed decrease detector coupled to the other of said sensors to produce a fifth signal proportional to a given decrease in the other of said speed signals after said third signal is produced, and first logic circuitry coupled to said subtractor, said first and second deceleration detectors and said first and second decrease detectors to produce said first actuation signal in response to a combination of signals selected from said first, second, third, fourth and fifth signals.
Claim 3
Dependent Claim
30 words
A system according to claim 1, wherein said first logic circuitry is responsive to the combination of said second, third, fourth and fifth signals to produce said first actuation signal.
Claim 4
Dependent Claim
41 words
A system according to claim 1, wherein said first logic circuitry is responsive to the combination of said first signal, one of said second and third signals and one of said third and fourth signals to produce said first actuation signal.
Claim 5
Dependent Claim
127 words
A system according to claim 1, wherein said first logic circuitry includes a first AND gate coupled to said first deceleration detector and said first speed decrease detector, a second AND gate coupled to said second deceleration detector and said second speed decrease detector, a first time delay device coupled to said first AND gate, a second time delay device coupled to said second AND gate, a third AND gate coupled to said first and second time delay devices, a fourth AND gate coupled to said second time delay device and said subtractor, a fifth AND gate coupled to said first time delay device and said subtractor, and a first OR gate coupled to said third, fourth and fifth AND gates to produce said first actuation sIgnal.
Claim 6
Dependent Claim
43 words
A system according to claim 4, wherein said control system further includes means coupled to both of said sensors and said control means to produce a second actuation signal to cause said control means to reapply braking pressure to both of said wheels.
Claim 7
Dependent Claim
24 words
A system according to claim 5, wherein said second actuation signal is produced when both of said wheels have achieved a given reacceleration value.
Claim 8
Dependent Claim
55 words
A system according to claim 5, wherein said second actuation signal is produced when the speed of one of said wheels does not result in producing one of said second and third signals and the other of said wheels has achieved a given reacceleration value after producing the other of said second and third signals.
Claim 9
Dependent Claim
95 words
A system according to claim 5, wherein said means includes a first reacceleration detector coupled to one of said sensors to produce a sixth signal when the associated one of said wheels has achieved a first given reacceleration value, a second reacceleration detector coupled to the other of said sensors to produce a seventh signal when the associated one of said wheels has achieved a second given reacceleration value, and second logic circuitry coupled to said first and second reacceleration detectors and said first and second time delay devices to produce said second actuation signal.
Claim 10
Dependent Claim
123 words
A system according to claim 8, wherein said logic circuitry includes a second OR gate coupled to said first and second time delay devices, a first NOT gate coupld to said first time delay device, a second NOT gate coupled to said second time delay device, a sixth AND gate coupled to said second time delay device, said first NOT gate and said second reacceleration detector, a seventh AND gate coupled to said first time delay device, said second NOT gate and said first reacceleration detector, an eighth AND gate coupled to said second OR gate and said first and second reacceleration detectors, and a third OR gate coupled to said sixth, seventh and eighth AND gates to produce said second actuation signal.
Claim 11
Dependent Claim
45 words
A system according to claim 9, wherein the output of said third OR gate is coupled to said first and second time delay device, said first and second time delay device being reset to their initial output condition in response to said second actuation signal.
Claim 12
Dependent Claim
68 words
A system according to claim 1, wherein said control system further includes means coupled to both of said sensors and said control means to produce a second actuation signal for said control means as a function of reacceleration signals generated in response to a speed signal from both of said sensors, said second actuation signal causing said control means to reapply braking pressure to both of said wheels.
Claim 13
Dependent Claim
24 words
A system according to claim 11, wherein said second actuation signal is produced when both of said wheels have achieved a given reacceleration value.
Claim 14
Dependent Claim
44 words
A system according to claim 11, wherein said second actuation signal is produced when one of said wheels has not achieved an incipient skid deceleration and the other of said wheels has achieved a given reacceleration value after having achieved an incipient skid deceleration.
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |