Patent US3716273A successfully refreshed from Google Patents.
US3716273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable sensitivity anti-lock brake control
Assignee: Motors Liquidation Co
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Filing: 1970-06-01
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Granted: 1973-02-13
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Expires: 1990-06-01
Abstract
Abstract The control includes a reference signal with which braked wheel deceleration is compared for sensing incipient wheel lock-up and a circuit responsive to the rate of change of deceleration for changing the reference signal to make the control more or less sensitive to deceleration. The circuit is so arranged that the sensitivity is increased at a low rate of change of deceleration such as occurs during a gradual application of brake pressure on a low coefficient of friction surface.
Inventors
- 👤 D Beyerlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:11
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
In an anti-lock brake control system for a wheeled vehicle having wheel braking means, a brake regulator means including means for sensing rotation of a braked wheel, and a control responsive to wheel Rotation for effecting brake release to prevent wheel lock-up, the control having a varying sensitivity level to accommodate road surfaces of different coefficients of friction and different rates of brake application, and means for selecting the appropriate sensitivity level comprising: rate means responsive to rotation of a braked wheel for measuring the rate of change of wheel deceleration and means responsive to the rate of change of wheel deceleration for changing the sensitivity level of the control, whereby on low coefficient surfaces and with relatively gradual brake application the control is more sensitive to wheel deceleration than on high coefficient surfaces or with abrupt brake application.
Claim 2
Dependent Claim
139 words
In an anti-lock brake control system for a wheeled vehicle having wheel braking means, a brake regulator means including means for sensing rotation of a braked wheel, and a control responsive to wheel Rotation for effecting brake release to prevent wheel lock-up, the control having a varying sensitivity level to accommodate road surfaces of different coefficients of friction and different rates of brake application, and means for selecting the appropriate sensitivity level comprising: rate means responsive to rotation of a braked wheel for measuring the rate of change of wheel deceleration and means responsive to the rate of change of wheel deceleration for changing the sensitivity level of the control, whereby on low coefficient surfaces and with relatively gradual brake application the control is more sensitive to wheel deceleration than on high coefficient surfaces or with abrupt brake application.
Claim 3
Dependent Claim
139 words
In an anti-lock brake control system for a wheeled vehicle having wheel braking means, a brake regulator means including means for sensing rotation of a braked wheel, and a control responsive to wheel Rotation for effecting brake release to prevent wheel lock-up, the control having a varying sensitivity level to accommodate road surfaces of different coefficients of friction and different rates of brake application, and means for selecting the appropriate sensitivity level comprising: rate means responsive to rotation of a braked wheel for measuring the rate of change of wheel deceleration and means responsive to the rate of change of wheel deceleration for changing the sensitivity level of the control, whereby on low coefficient surfaces and with relatively gradual brake application the control is more sensitive to wheel deceleration than on high coefficient surfaces or with abrupt brake application.
Claim 4
Dependent Claim
139 words
In an anti-lock brake control system for a wheeled vehicle having wheel braking means, a brake regulator means including means for sensing rotation of a braked wheel, and a control responsive to wheel Rotation for effecting brake release to prevent wheel lock-up, the control having a varying sensitivity level to accommodate road surfaces of different coefficients of friction and different rates of brake application, and means for selecting the appropriate sensitivity level comprising: rate means responsive to rotation of a braked wheel for measuring the rate of change of wheel deceleration and means responsive to the rate of change of wheel deceleration for changing the sensitivity level of the control, whereby on low coefficient surfaces and with relatively gradual brake application the control is more sensitive to wheel deceleration than on high coefficient surfaces or with abrupt brake application.
Claim 5
Dependent Claim
199 words
In an anti-lock system for a wheeled vehicle having braking means, a brake regulator means including means for sensing rotation of a braked wheel and a control circuit responsive to wheel rotation for cyclically effecting brake release and brake application to prevent wheel lock-up and maintain optimum braking effort, the control circuit having a varying sensitivity level on the first brake release cycle only to accommodate road surfaces of high or low coefficients of friction and rapid or slow rates of brake application, and means for selecting the appropriate sensitivity level comprising, rate means responsive to rotation of a braked wheel for measuring the rate of change of wheel deceleration, means responsive to the rate of change of wheel deceleration for changing the sensitivity level of the control circuit to effect a high sensitivity at a low rate of change of wheel deceleration and a low sensitivity at a high rate of change of wheel deceleration, and means effective upon the first brake release for disabling the sensitivity selecting means whereby on low coefficient surfaces and with relatively gradual brake application the control is more sensitive to wheel deceleration than on high coefficient surfaces or with abrupt brake application.
Claim 6
Dependent Claim
199 words
In an anti-lock system for a wheeled vehicle having braking means, a brake regulator means including means for sensing rotation of a braked wheel and a control circuit responsive to wheel rotation for cyclically effecting brake release and brake application to prevent wheel lock-up and maintain optimum braking effort, the control circuit having a varying sensitivity level on the first brake release cycle only to accommodate road surfaces of high or low coefficients of friction and rapid or slow rates of brake application, and means for selecting the appropriate sensitivity level comprising, rate means responsive to rotation of a braked wheel for measuring the rate of change of wheel deceleration, means responsive to the rate of change of wheel deceleration for changing the sensitivity level of the control circuit to effect a high sensitivity at a low rate of change of wheel deceleration and a low sensitivity at a high rate of change of wheel deceleration, and means effective upon the first brake release for disabling the sensitivity selecting means whereby on low coefficient surfaces and with relatively gradual brake application the control is more sensitive to wheel deceleration than on high coefficient surfaces or with abrupt brake application.
Claim 7
Dependent Claim
168 words
In an anti-lock brake control system for a wheeled vehicle having wheel braking means, a brake regulator means including means for sensing rotation of a braked wheel and a control circuit responsive to wheel rotation for cyclically effecting brake release and brake application to prevent wheel lock-up, the control circuit having means for producing a signal as a function of wheel deceleration, means for producing a reference signal, comparator means for comparing the deceleration signal to the reference signal so that the sensitivity of the comparator means to wheel deceleration is affected by the value of the reference signal, rate means responsive to rotation of a braked wheel for measuring the rate of change of wheel deceleration, and means responsive to the rate of change of deceleration for attenuating the reference signal thereby changing the sensitivity of the control, whereby on low coefficient surfaces and with relatively gradual brake application the control is more sensitive to wheel deceleration than on high coefficient surfaces or with abrupt brake application.
Claim 8
Dependent Claim
168 words
In an anti-lock brake control system for a wheeled vehicle having wheel braking means, a brake regulator means including means for sensing rotation of a braked wheel and a control circuit responsive to wheel rotation for cyclically effecting brake release and brake application to prevent wheel lock-up, the control circuit having means for producing a signal as a function of wheel deceleration, means for producing a reference signal, comparator means for comparing the deceleration signal to the reference signal so that the sensitivity of the comparator means to wheel deceleration is affected by the value of the reference signal, rate means responsive to rotation of a braked wheel for measuring the rate of change of wheel deceleration, and means responsive to the rate of change of deceleration for attenuating the reference signal thereby changing the sensitivity of the control, whereby on low coefficient surfaces and with relatively gradual brake application the control is more sensitive to wheel deceleration than on high coefficient surfaces or with abrupt brake application.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |