US3909070A
Expired / Lapsed
US
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Anti-locking control system
Assignee: Robert Bosch GmbH
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Filing: 1973-08-28
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Granted: 1975-09-30
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Expires: 1993-08-28
Abstract
Abstract An anti-locking control system for the common control of brake pressure at the wheel brakes of a plurality of wheels of a vehicle comprises apparatus for sensing a tendency to lock on the part of the wheels, first switching apparatus responsive to the sensing apparatus for producing an output related to locking tendencies of the wheels and switchable to a ''''select low'''' or a ''''select high'''' stage, and second switching apparatus operable to switch the first switching apparatus from the ''''select low'''' to the ''''select high'''' stage on the appearance of an output from the first switching apparatus in the ''''select low'''' stage.
Inventors
- 👤 Heinz Leiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:46
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1701; B60T8/1708; B60T8/32; B60T8/58
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
160 words
In a wheeled vehicle having a wheel braking system with wheel brakes associated with the respective wheels, an anti-locking control system for the common control of the brake pressure at the wheel brakes of a plurality of said wheels of said vehicle comprising: sensing means for sensing a tendency to lock on the part of the wheels; first switching means responsive to said sensing means for producing, in a first switching state (''''select low''''), a signal if at least one wheel shows a tendency to lock and for producing in a second switching state (''''select-high'''') a signal if all wheels show a tendency to lock; and second switching means responsive to an output signal from said first switching means for, after a predetermined time period, switching over said first switching means from said ''''select low'''' switching state to said ''''select high'''' switching state for a second predetermined time period if said first switching means is in its ''''select low'''' state.
Claim 2
Dependent Claim
160 words
In a wheeled vehicle having a wheel braking system with wheel brakes associated with the respective wheels, an anti-locking control system for the common control of the brake pressure at the wheel brakes of a plurality of said wheels of said vehicle comprising: sensing means for sensing a tendency to lock on the part of the wheels; first switching means responsive to said sensing means for producing, in a first switching state (''''select low''''), a signal if at least one wheel shows a tendency to lock and for producing in a second switching state (''''select-high'''') a signal if all wheels show a tendency to lock; and second switching means responsive to an output signal from said first switching means for, after a predetermined time period, switching over said first switching means from said ''''select low'''' switching state to said ''''select high'''' switching state for a second predetermined time period if said first switching means is in its ''''select low'''' state.
Claim 3
Dependent Claim
33 words
A system as defined in claim 1, and comprising means for causing switch over of said first switching means from its ''''select low'''' state to its ''''select high'''' state after 20 m sec.
Claim 4
Dependent Claim
43 words
A system as defined in claim 1 and comprising means for varying said time period during which said first switching means is in its ''''select high'''' state in dependence on the vehicle speed whereby said second time period increases with decreasing vehicle speed.
Claim 5
Dependent Claim
43 words
A system as defined in claim 1 anD comprising means for varying said time period during which said first switching means is in its ''''select high'''' state in dependence on the vehicle deceleration whereby said second time period increases with decreasing vehicle deceleration.
Claim 6
Dependent Claim
46 words
A system as defined in claim 1 and comprising means for preventing switch over of said first switching means to the ''''select high'''' state if the vehicle deceleration falls below a predetermined value and the steering wheel of said vehicle is turned to a predetermined extent.
Claim 7
Dependent Claim
44 words
A system as defined in claim 1 and comprising means for preventing switch over of said first switching means to the ''''select high'''' state if the vehicle deceleration falls below a predetermined value and a predetermined kink angle occurs between trailer and mechanical horse.
Claim 8
Dependent Claim
135 words
A system as defined in claim 1 wherein: said sensing means includes wheel speed sensors for sensing the wheel speeds of each wheel and producing an output signal having a value related thereto, means for producing a signal having a mean value from the output signals of said wheel speed sensors, and means for generating a reference value signal approximating the speed of the vehicle; said first switching means includes a comparator having first and second stages for comparison between the said mean value signal and a first portion of said reference signal (''''select low'''') or a second portion smaller than half of said reference signal (''''select high''''); and said second switching means switches said comparator between said first and second stages on receipt of an output signal from said comparator in said first stage.
Claim 9
Dependent Claim
44 words
A system as defined in claim 7, wherein said second switching means includes a timing element to which said output signal from said comparator is applied and by which the length of time of switch over of said comparator to ''''select high'''' is determined.
Claim 10
Dependent Claim
36 words
A system as defined in claim 8, and comprising a gate located prior to said timing element for blocking an input to said timing element on the appearance of an output signal from said timing element.
Claim 11
Dependent Claim
48 words
A system as defined in claim 9 and comprising a bistable element which is set by said output signal of said timing element to block said gate and reset, after the termination of said output signal from said timing element, when said output signal of said comparator terminates.
Claim 12
Dependent Claim
22 words
A system as defined in claim 8, wherein said timing element comprises an element whose timing is controllable by a control voltage.
Claim 13
Dependent Claim
21 words
A system as defined in claim 11, wherein said control voltage comprises a voltage dependent on the speed of said vehicle.
Claim 14
Dependent Claim
21 words
A system as defined in claim 11, wherein said control voltage comprises a voltage dependent on the deceleration of said vehicle.
Claim 15
Dependent Claim
28 words
A system as defined in claim 11, wherein said control voltage comprises a voltage dependent on the speed of said vehicle and on the deceleration of said vehicle.
Claim 16
Dependent Claim
50 words
A system as defined in claim 8 and comprising means for preventing switching over of said switching means from said ''''select low'''' state to said ''''select high'''' state if the vehicle deceleration falls below a predetermined value and the steering wheel of said vehicle is turned to a predetermined extent.
Claim 17
Dependent Claim
48 words
A system as defined in claim 8 and comprising means for preventing switching over of said switching means from said ''''select low'''' state to said ''''select high'''' state if the vehicle deceleration falls below a predetermined value and a predetermined kink angle occurs between trailer and mechanical horse.
Claim 18
Dependent Claim
46 words
A system as defined in claim 7 and comprising a measuring device for measuring transverse accelerations of said vehicle and means responsive to sudden changes in the transverse acceleration measured by said measuring device for shortening the time said comparator is in the ''''select high'''' state.
Claim 19
Dependent Claim
50 words
A system as defined in claim 7 and comprising a measuring device for measuring transverse accelerations of said vehicle and means responsive to sudden changes in the transverse acceleration measured by said measuring device for preventing switch over of said comparator from the ''''select low'''' into the ''''select high'''' state.
Claim 20
Dependent Claim
54 words
A system as defined in claim 7 and comprising means for determining different frictional values at wheels on opposite sides of said vehicle and means responsive to said determining means for shortening the time said comparator is in the ''''select high'''' said state on the occurrence of a predetermined difference in said frictional values.
Claim 21
Dependent Claim
42 words
A system as defined in claim 19 and comprising means responsive to said determining means for shortening the time prior to switch over of said comparator to the ''''select high'''' state on the occurrence of a predetermined difference in said frictional values.
Claim 22
Dependent Claim
67 words
A system as defined in claim 7 and comprising means for determining different frictional values at wheels on opposite sides of said vehicle and means responsive to said determining means for providing said wheel brakes with a pressure between that associated with ''''select low'''' operation and that associated with ''''select high'''' operation for a predetermined time on the occurrence of a predetermined difference in said frictional values.
Claim 23
Dependent Claim
23 words
A system as defined in claim 21, wherein said responsive means is actuated for at least the time of a ''''select high'''' operation.
Claim 24
Dependent Claim
32 words
A system as defined in claim 7 and comprising means for determining different frictional values at wheels on opposite sides of said vehicle and means responsive thereto for providing a control signal.
Claim 25
Dependent Claim
26 words
A system as defined in claim 23 wherein said determining means comprises means for measuring the controlled brake pressure at the front wheels of said vehicle.
Claim 26
Dependent Claim
42 words
A system as defined in claim 23, wherein said determining means comprises means for measuring the response times of control valves for controlling the brake pressures, the said valve response time representing a measure of the brake pressure value during their control.
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |