US3612622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skid control system
Assignee: ZF Active Safety US Inc
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Filing: 1969-02-27
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Granted: 1971-10-12
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Expires: 1989-02-27
Abstract
Abstract A skid control system for a wheeled vehicle varies the braking pressure as a function of the slip, the difference between vehicle speed and wheel speed. A vehicle analogue circuit provides a signal V1 representative of the reduction in vehicle velocity during braking. The instantaneous vehicle velocity Vv is obtained by substracting the loss of vehicle velocity V1 from the initial vehicle velocity Vw1. The instantaneous vehicle velocity Vv is fed to a difference circuit which produces an output signal X when the wheel velocity Vw and a slip reference signal Vsr exceed signal Vv. Output signal X causes actuation of a modulator to relieve brake pressure.
Inventors
- 👤 Hugh E Riordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:12
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
A skid control system for a wheeled vehicle having an actuatable braking system for at least one wheel, the skid control system comprising: first means for providing a wheel speed signal having a magnitude indicative of the velocity of that one wheel, analogue means responsive to said wheel speed signal for providing a vehicle velocity analogue signal during a skid condition having magnitude indicative of the instantaneous velocity of the vehicle said analogue means including means for varying magnitude of the analogue signal during actuation of said braking system as a function of the variation in magnitude of said wheel speed signal.
Claim 2
Dependent Claim
102 words
A skid control system for a wheeled vehicle having an actuatable braking system for at least one wheel, the skid control system comprising: first means for providing a wheel speed signal having a magnitude indicative of the velocity of that one wheel, analogue means responsive to said wheel speed signal for providing a vehicle velocity analogue signal during a skid condition having magnitude indicative of the instantaneous velocity of the vehicle said analogue means including means for varying magnitude of the analogue signal during actuation of said braking system as a function of the variation in magnitude of said wheel speed signal.
Claim 3
Dependent Claim
141 words
The system of claim 1 said function being the rate of change of said magnitude of said wheel speed signal. 3 A skid control system for a wheeled vehicle having a braking system for at least one wheel and modulating means for relieving the brake actuation at at least said one wheel during a detected skid condition allowing spin-up of said wheel, the skid control system comprising: first means for providing a wheel speed signal having a magnitude indicative of the velocity of that one wheel, analogue means responsive to said wheel speed signal for providing vehicle velocity analogue signal having a magnitude indicative of the instantaneous velocity of the vehicle said analogue means including means for varying magnitude of the analogue signal as a function of the rate of change of the magnitudE of said wheel speed signal during spinup.
Claim 4
Dependent Claim
80 words
The system of claim 3 with said analogue means including hold means responsive to said wheel speed signal and to initiation of actuation of the braking system for providing an initial wheel speed signal indicative of the magnitude of said wheel speed signal prior to actuation and velocity change means responsive to said function of said wheel speed signal for providing a vehicle velocity change signal having a magnitude indicative of the change in velocity of the vehicle during braking.
Claim 5
Dependent Claim
25 words
The system f claim 4 with said vehicle velocity analogue signal being derived from said initial wheel speed signal and said vehicle velocity change signal.
Claim 6
Dependent Claim
100 words
The system of claim 5 including modulating means for modulating the braking system in response to an output signal, output means for providing said output signal in response to said initial wheel speed signal, said vehicle velocity change signal and said wheel speed signal having a preselected relationship indicative of a skid condition. The system of claim 6 with said output signal means responsive to the magnitude of a reference signal indicative of a determinable magnitude of slip relative to the slip indication derived from said initial wheel speed signal, said vehicle velocity change signal, and said wheel speed signal.
Claim 7
Dependent Claim
12 words
The system of claim 7 with said reference signal having fixed magnitude.
Claim 8
Dependent Claim
23 words
The system of claim 8 with said reference signal having a magnitude varying in accordance with said function of said wheel speed signal.
Claim 9
Dependent Claim
25 words
The system of claim 7 with said reference signal having a magnitude varying in accordance with variations in the magnitude of said wheel speed signal.
Claim 10
Dependent Claim
63 words
The system of claim 7 with said analogue means including memory means for retaining the magnitude of said rate of change of said wheel speed signal, said means responsive to said output signal for readjusting the magnitude of said rate of change of said wheel speed to correspond to that magnitude occuring during the spin-up resulting from the occurrence of said output signal.
Claim 11
Dependent Claim
31 words
The system of claim 4 with the rate of change of said vehicle velocity change signal being determined by said rate of change of said magnitude of said wheel speed 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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |