US3832010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake control devices for preventing locking a braked wheel
Assignee: Automobiles Citroen SA
•
Filing: 1972-06-06
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Granted: 1974-08-27
•
Expires: 1992-06-06
Abstract
Abstract A brake control device for the wheel of a motor or other vehicle comprises an electrically operated valve incorporated in the braking circuit of the wheel. The valve is controlled by a pulsed current having a frequency or width dependent on the degree of slip of the wheel, and serves to limit the pressure of fluid in the braking circuit during such wheel slip.
Inventors
- 👤 A Grosseau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:40
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/3655; B60T8/366; B60T8/3665; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
124 words
Apparatus for controlling the braking of at least one wheel of a vehicle traveling along the ground, which comprises: a. means operative to provide a pulsed current control signal proportional to the degree of slip of said wheel, said means including i. first means operative to generate a first signal proportional to the difference between a reference speed and the speed of said wheel, ii. second means operative to generate a sawtooth signal, and iii. third means including bistable circuit means operative to receive the sawtooth signal and the first signal and operative to generate the pulsed current control signal in response thereto; and b. an electrically operated valve operative to receive the pulsed current control signal and automatically proportion braking pressure responsive thereto.
Claim 2
Dependent Claim
124 words
Apparatus for controlling the braking of at least one wheel of a vehicle traveling along the ground, which comprises: a. means operative to provide a pulsed current control signal proportional to the degree of slip of said wheel, said means including i. first means operative to generate a first signal proportional to the difference between a reference speed and the speed of said wheel, ii. second means operative to generate a sawtooth signal, and iii. third means including bistable circuit means operative to receive the sawtooth signal and the first signal and operative to generate the pulsed current control signal in response thereto; and b. an electrically operated valve operative to receive the pulsed current control signal and automatically proportion braking pressure responsive thereto.
Claim 3
Dependent Claim
26 words
Apparatus as claimed in claim 1, in which the pulsed current control signal comprises pulses of fixed frequency, but of variable width governed by the slip.
Claim 4
Dependent Claim
26 words
Apparatus as claimed in claim 1, in which the pulsed current control signal comprises pulses of fixed width but of variable frequency governed by the slip.
Claim 5
Dependent Claim
30 words
Apparatus as claimed in claim 1, in which the first means comprises means for determining the speed differential between the fastest wheel of the vehicle and the said one wheel.
Claim 6
Dependent Claim
50 words
Apparatus as claimed in claim 4, in which the first means further comprises means for placing data of the speed of the fastest wheel in a memory store, and means for emitting a signal decreasing in value at a speed representing the maximum deceleration obtainable in optimum conditions of adhesion.
Claim 7
Dependent Claim
31 words
Apparatus as claimed in claim 4, in which the first means further comprises an electro-magnetic pick-up associated with said one wheel emitting pulses at a frequency governed by the wheel speed.
Claim 8
Dependent Claim
29 words
Apparatus as claimed in claim 6, in which the first means further comprises integration means converting into a variable voltage the pulses of variable frequency coming from the pick-up.
Claim 9
Dependent Claim
46 words
Apparatus as claimed in claim 7, in which the first means further comprises a first comparator, and means generating a voltage representing a fraction of the speed of the fastest wheel, said comparator having inputs connected to the integration means and to the voltage generating means.
Claim 10
Dependent Claim
45 words
Apparatus as claimed in claim 8, in which the said third means comprises a second comparator receiving the output from the first comparator and from the second means, said bistable circuit means comprising a bistable flipflop controlled by the output signal of the second comparator.
Claim 11
Dependent Claim
45 words
Apparatus as claimed in claim 1 wherein the electrically operated valve comprises a. an electro-dynamic motor comprising an axially movable winding operative to receive the pulsed current control signal and move responsive thereto; and b. slide means connected to the winding operative to move therewith.
Claim 12
Dependent Claim
45 words
Apparatus as claimed in claim 10, in which the electrically operated valve further comprises means controlled by the downstream fluid pressure tending to move the slide means in a first direction, and an opposing spring tending to move the slide means towards an opposite direction.
Claim 13
Dependent Claim
60 words
Apparatus as claimed in claim 10 further comprising a plurality of wheels a said electrically operated valve associated with each wheel, and a said pulsed current control signal means associated with each wheel governed by the slip of the respective wheel for providing a pulsed current control signal to be applied to the winding of the respective electrically operated valve.
Claim 14
Dependent Claim
52 words
Apparatus as claimed in claim 10 wherein said vehicle further comprises front and rear axles with a plurality of wheels on each axle, one electrically operated valve for each axle of the vehicle, and means for controlling the respective valve according to the speed of the slowest wheel on the associated axle.
Claim 15
Dependent Claim
28 words
Apparatus as claimed in claim 13, in which the electrically operated valve incorporated in the brake circuit of the rear axle is of the ''''hit or miss'''' type.
Claim 16
Dependent Claim
26 words
Apparatus as claimed in claim 14 further comprising deceleration threshold means for controlling the electrically operated valve incorporated in the braking circuit of the rear axle.
Claim 17
Dependent Claim
26 words
Apparatus as claimed in claim 14 further comprising slip threshold means for controlling the electrically operated valve incorporated in the braking circuit of the rear axle.
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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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |