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US4230375A
Expired / Lapsed
US
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Anti-skid braking system
Assignee: Robert Bosch GmbH
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Filing: 1978-02-14
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Granted: 1980-10-28
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Expires: 1998-02-14
Abstract
Abstract An anti-skid or anti-wheel-lock system for motor vehicles in which a rotation sensor sends signals to a processor that determines if wheel lock is imminent and then sends brake force reduction control signals to a brake force controller. The control signals are first passed through a time filter having a plurality of discrete paths with differing signal constants. The selection of the filtering time constant is made by a circuit which measures the period between control signals against a reference time and changes the filtering time constant in accordance with the results of the measurement.
Inventors
- 👤 Heinz Leiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:57
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
An anti-skid braking system for a vehicle having wheel brakes including a pressure inlet valve and including: a wheel motion transducer, associated with a vehicle wheel, for generating wheel signals related to wheel rotation; a brake force generator for actuating said wheel brakes with variable force; a processor unit for receiving said wheel signals from said wheel motion transducer and for generating first control signals for said brake force generator; at least one signal filter for receiving said first control signals from said processor unit and for generating second control signals which are selectively timed with respect to said first control signals; and a timing circuit for receiving said first control signals and for generating filter switching signals which are applied to said signal filter to change the time constant thereof and cause said selective timing of said second control signals.
Claim 2
Dependent Claim
141 words
An anti-skid braking system for a vehicle having wheel brakes including a pressure inlet valve and including: a wheel motion transducer, associated with a vehicle wheel, for generating wheel signals related to wheel rotation; a brake force generator for actuating said wheel brakes with variable force; a processor unit for receiving said wheel signals from said wheel motion transducer and for generating first control signals for said brake force generator; at least one signal filter for receiving said first control signals from said processor unit and for generating second control signals which are selectively timed with respect to said first control signals; and a timing circuit for receiving said first control signals and for generating filter switching signals which are applied to said signal filter to change the time constant thereof and cause said selective timing of said second control signals.
Claim 3
Dependent Claim
49 words
An anti-skid braking system as defined by claim 1, further comprising circuit means to receive said first control signals and for blocking any change of the time constant in said signal filter if two sequential first control signals are received without an intermediate pressure increase in said braking system.
Claim 4
Dependent Claim
67 words
An anti-skid braking system as defined in claim 2, further including pressure inlet means in said brake system and circuit means for determining if said pressure inlet valve was opened for at least a predetermined amount of time and for causing a signal to increase said time constant in said signal filter if said pressure inlet valve was not opened at least a predetermined period of time.
Claim 5
Dependent Claim
52 words
An anti-skid braking system as defined in claim 3, further comprising a memory for defining a particular filter time constant and a second timing circuit for actuating a gate if the vehicle brakes have not been actuated during a predetermined amount of time and if the vehicle has exceeded a predetermined speed.
Claim 6
Dependent Claim
68 words
An anti-skid braking system as defined in claim 1, wherein said at least one signal filter includes a plurality of discrete circuit components, each having a different time constant associated therewith, and each having said first control signals applied thereto, said discrete circuit components being selectively actuated to generate said second control signals, said second control signals being thereby selectively timed with respect to said first control signals.
Claim 7
Dependent Claim
67 words
An anti-skid braking system as defined in claim 5, wherein said timing circuit includes further switching means for generating further filter switching signals which are applied to said signal filter to set the signal filter at the termination of said first control signals in order that the discrete circuit component having the shortest time constant can be actuated for the next application of said first control signals.
Claim 8
Dependent Claim
88 words
An anti-skid braking system as defined in claim 1, wherein said timing circuit includes a timing element having a given timing constant, and means for generating a first output generating signal as a filter switching signal, and wherein the period of said first control signals is compared to the timing constant of said timing element such that when the period between first signals is smaller than said timing constant said first output generating signal is generated thereby causing an increase of the time constant in said signal filter.
Claim 9
Dependent Claim
96 words
An anti-skid braking system as defined in claim 7, wherein said timing circuit further includes a further timing element having a given timing constant, and means for generating a second output generating signals as a filter switching signal, and wherein the period of said first control signals is compared to the timing constant of said further timing element such that when the period between first signals is greater than the timing constant of said further timing element said second output generating signal is generated thereby causing a decrease of the time constant in said signal filter.
Claim 10
Dependent Claim
33 words
An anti-skid braking system as defined by claim 8, wherein said signals for increasing and decreasing said time constant are applied to said signal filter to initiate a stepwise increase and decrease, respectively.
Claim 11
Dependent Claim
43 words
An anti-skid braking system as defined in claim 8, further including a memory for receiving said output signals from said timing circuit and for generating a switching datum to be applied to said signal filter, said memory being engaged by said timing circuit.
References Cited (Backward Citations)
US4054328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |