US3604760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skid control system
Assignee: ZF Active Safety US Inc
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Filing: 1969-03-24
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Granted: 1971-09-14
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Expires: 1989-03-24
Abstract
Abstract A skid control system for a wheeled vehicle having a plurality of wheels and a brake system for the wheels with the brake of at least one of the wheels being relieved upon the detection of an incipient skid condition and being reapplied when the spin-up or acceleration rate of that wheel is a maximum.
Inventors
- 👤 Thomas M Atkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:52
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
A skid control system for a wheeled vehicle having a plurality of wheels and a brake system for at least one of the wheels, said skid control system comprising: modulating means responsive to a first signal for relieving brake actuation and to a second signal for reapplying brake actuation for said at least one of the wheels, first means responsive to occurrence of an incipient skid condition at said at least one of the wheels for providing said first signal, and second means responsive to attainment of maximum acceleration of said at least one of the wheels after brake relief for providing said second signal, said second means including sensing means for sensing the amplitude of acceleration of said at least one of the wheels and for providing said second signal generally at the maximum amplitude of acceleration.
Claim 2
Dependent Claim
138 words
A skid control system for a wheeled vehicle having a plurality of wheels and a brake system for at least one of the wheels, said skid control system comprising: modulating means responsive to a first signal for relieving brake actuation and to a second signal for reapplying brake actuation for said at least one of the wheels, first means responsive to occurrence of an incipient skid condition at said at least one of the wheels for providing said first signal, and second means responsive to attainment of maximum acceleration of said at least one of the wheels after brake relief for providing said second signal, said second means including sensing means for sensing the amplitude of acceleration of said at least one of the wheels and for providing said second signal generally at the maximum amplitude of acceleration.
Claim 3
Dependent Claim
30 words
The system of claim 1 with said sensing means providing said second signal after the amplitude of acceleration has attained and decreased from the maximum amplitude by a preselected amount.
Claim 4
Dependent Claim
29 words
The system of claim 2 with said sensing means comprising a capacitor with the magnitude of charge of said capacitor providing an indication of the maximum amplitude of acceleration.
Claim 5
Dependent Claim
26 words
The syStem of claim 3 with said sensing means further comprising an emitter-follower transistor circuit electrically connected to said capacitor for affecting said magnitude of charge.
Claim 6
Dependent Claim
26 words
The system of claim 4 with said second means comprising resetting means for resetting the charge on said capacitor prior to initiation of said first signal.
Claim 7
Dependent Claim
76 words
The system of claim 1 with said first means including wheel speed means for providing a wheel speed signal indicative of the speed of said at least one of the wheels and slip means for providing a slip signal indicative of the slip between the vehicle and said at least one of the wheels, and output means for providing said first signal when said slip signal attains a magnitude indicative of a preselected amount of slip.
Claim 8
Dependent Claim
20 words
The system of claim 6 with said modulating means providing brake relief as long as said first signal is provided.
Claim 9
Dependent Claim
67 words
The system of claim 7 with said slip means providing a vehicle speed signal as an analogue of vehicle speed in response to said wheel speed signal based upon a preselected deceleration rate whereby vehicle speed is approximated by decreasing said wheel speed signal at said preselected rate, and including means for comparing said wheel speed signal and said vehicle speed signal for providing said slip signal.
Claim 10
Dependent Claim
30 words
The system of claim 8 with said sensing means providing said second signal after the amplitude of acceleration has attained and decreased from the maximum amplitude by a preselected amount.
Claim 11
Dependent Claim
29 words
The system of claim 9 with said sensing means comprising a capacitor with the magnitude of charge of said capacitor providing an indication of the maximum amplitude of acceleration.
Claim 12
Dependent Claim
26 words
The system of claim 10 with said sensing means further comprising an emitter-follower transistor circuit electrically connected to said capacitor for affecting said magnitude of charge.
Claim 13
Dependent Claim
26 words
The system of claim 11 with said second means comprising resetting means for resetting the charge on said capacitor prior to initiation of said first signal.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |