US3838892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive braking system
Assignee: Bendix Corp
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Filing: 1972-10-31
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Granted: 1974-10-01
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Expires: 1992-10-31
Abstract
Abstract An adaptive braking system for an automotive vehicle is disclosed which includes a duty-cycle generator that generates a control signal for actuating a solenoid valve which controls braking pressure in the vehicle''s brake actuators. The duty-cycle generator produces a pulsed output which actuates the solenoid valve; the width of the pulses being modulated so that rather precise control of the braking pressure is attained. The width of the pulses is determined by input signals representing wheel acceleration, wheel slip, and an error term. The adaptive braking cycle is initiated whenever wheel acceleration drops below a predetermined low deceleration level, or when wheel deceleration is maintained in a band between two deceleration levels for a sufficient time period. On the other hand, adaptive control of the vehicle''s brakes is terminated whenever uninhibited fluid communication to the brake actuators is required or when wheel speed drops below a predetermined low reference guide.
Inventors
- 👤 R Eslinger
- 👤 D Davis
- 👤 J Juhasz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:55
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; B60T8/1763; B60T8/17633; B60T8/32; B60T8/34; B60T8/341; B60T8/342
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
247 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; control means responsive to the value of said second signal for generating a control signal for controlling actuation of said brake; means for generating a first reference signal corresponding To a first value of said second signal and a second reference signal corresponding to a second value of said second signal, said first reference signal corresponding to a higher value of said second signal than the value of said second signal represented by said second reference signal; means for comparing said second signal with said first and second reference signals and generating an output signal when the value of said second signal is less than said first reference signal and greater than said second reference signals, said comparing means terminating said output signal when the value of said second signal is greater than said first reference signal or less than said second reference signal including means for terminating said output signal whenever the value of the second signal is not in the band defined between said first and second reference signals; and means for extinguishing said control signal when said output signal is generated for a sufficiently long time period.
Claim 2
Dependent Claim
247 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; control means responsive to the value of said second signal for generating a control signal for controlling actuation of said brake; means for generating a first reference signal corresponding To a first value of said second signal and a second reference signal corresponding to a second value of said second signal, said first reference signal corresponding to a higher value of said second signal than the value of said second signal represented by said second reference signal; means for comparing said second signal with said first and second reference signals and generating an output signal when the value of said second signal is less than said first reference signal and greater than said second reference signals, said comparing means terminating said output signal when the value of said second signal is greater than said first reference signal or less than said second reference signal including means for terminating said output signal whenever the value of the second signal is not in the band defined between said first and second reference signals; and means for extinguishing said control signal when said output signal is generated for a sufficiently long time period.
Claim 3
Dependent Claim
58 words
The invention of claim 1: means for generating a speed reference signal corresponding to a predetermined value of said first signal; and said extinguishing means including means for extinguishing said control signal when the value of said first signal drops below said speed reference signal and the value of said second signal drops below said first reference signal.
Claim 4
Dependent Claim
37 words
The invention of claim 1: said first reference signal having a value corresponding to a positive value of said second signal, said second reference signal having a value corresponding to a negative value of said second signal.
Claim 5
Dependent Claim
59 words
The invention of claim 1; and means for generating a third reference signal corresponding to a value of said second signal substantially less than the value represented by said second reference signal; said control means comparing said second signal with said third reference signal and initiating said control signal when said second signal drops below said third reference signal.
Claim 6
Dependent Claim
42 words
The invention of claim 4: said control means including means initiating said control signal when the value of said second signal remains in the band defined between the values of said second and third reference signals for a predetermined period of time.
Claim 7
Dependent Claim
47 words
The invention of claim 4: said control means including means for adjusting the value of said control signal in accordance with the length of the time period in which the value of said second signal remains in the band defined between said second and third reference signals.
Claim 8
Dependent Claim
57 words
The invention of claim 1: means for generating a reference velocity signal; and means for generating a slip signal, said slip signal being a function of said first signal and of said reference velocity signal; said control means including means for adjusting the value of said control signal in accordance with the value of said slip signal.
Claim 9
Dependent Claim
47 words
The invention of claim 7: said reference velocity generating means including means responsive to a decrease in the value of said second signal to the level of said first reference signal to equate the value of said reference velocity signal with the value of said first signal.
Claim 10
Dependent Claim
112 words
The invention of claim 1: means responsive to a function of the value of said second signal for generating an error signal; said control means being responsive to said error signal to vary the value of said control signal as a function of the value of said error signal; said extinguishing means including means responsive to said output signal to decay the value of said error signal in a predetermined manner during generation of said output signal, and means comparing said error signal with an error reference signal of a predetermined value, said comparing means terminating said control signal when the value of said error signal drops below said error reference signal.
Claim 11
Dependent Claim
158 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of sAid brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating first and second reference signals, said second reference signal representing a level substantially less than that represented by said first signal; means for comparing said second signal with said second reference signal and generating a control signal for controlling actuation of said brake when said second signal drops below said second reference signal; and means for adjusting the value of said control signal in accordance with the length of the time period that the value of the second signal remains in the band defined by said first and second reference signals before dropping below said second reference signal.
Claim 12
Dependent Claim
158 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of sAid brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating first and second reference signals, said second reference signal representing a level substantially less than that represented by said first signal; means for comparing said second signal with said second reference signal and generating a control signal for controlling actuation of said brake when said second signal drops below said second reference signal; and means for adjusting the value of said control signal in accordance with the length of the time period that the value of the second signal remains in the band defined by said first and second reference signals before dropping below said second reference signal.
Claim 13
Dependent Claim
90 words
The invention of claim 10: means comparing said second signal with said first reference signal and generating a first intermediate signal when the value of said second signal drops below the value of said first reference signal; means responsive to said first intermediate signal to generate a second intermediate signal decaying in a predetermined manner; and means comparing said second intermediate signal with an intermeidate reference signal and generating said control signal when the value of said second intermediate signal drops below the value of the said intermediate reference signal.
Claim 14
Dependent Claim
133 words
The invention of claim 10: means comparing said second signal with said first reference signal and generating a first intermediate signal when the value of said second signal drops below the value of said first reference signal; means resposive to said first intermediate signal to generate a second intermediate signal decaying in a predetermined manner; and means responsive to a function of the value of said second signal for generating an error signal; said control means being responsive to said error signal to vary the value of said control signal as a function of the value of said error signal; and means responsive to generation of said control signal to set the initial value of said error signal equal to the value of said intermediate signal when said control signal is generated initially.
Claim 15
Dependent Claim
230 words
In a vehicle having a wheel and a brake for braking said wheel, and adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a function of the value of said second signal; control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; means for generating a reference velocity signal; means for generating a slip signal, said slip signal being a function of said first signal and of said reference velocity signal; said control means including means for adjusting the value of said control signal in accordance with the value of said slip signal, said error signal, and said second signal; and means for generating a first reference signal corresponding to a first value of said signal and a second reference signal corresponding to a second value of said second signal; said reference velocity generating means being responsive to a decrease in the value of said second signal to said first reference signal to equate the value of said reference velocity signal with the value of said first signal.
Claim 16
Dependent Claim
230 words
In a vehicle having a wheel and a brake for braking said wheel, and adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a function of the value of said second signal; control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; means for generating a reference velocity signal; means for generating a slip signal, said slip signal being a function of said first signal and of said reference velocity signal; said control means including means for adjusting the value of said control signal in accordance with the value of said slip signal, said error signal, and said second signal; and means for generating a first reference signal corresponding to a first value of said signal and a second reference signal corresponding to a second value of said second signal; said reference velocity generating means being responsive to a decrease in the value of said second signal to said first reference signal to equate the value of said reference velocity signal with the value of said first signal.
Claim 17
Dependent Claim
161 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a function of the value of said second signal; and control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; means for generating a first reference signal corresponding to a first value of said second signal and a second reference signal corresponding to a second value of said second signal; and means for decaying said error signal when the value of said second signal is in the band defined between said first and second reference values.
Claim 18
Dependent Claim
161 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a function of the value of said second signal; and control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; means for generating a first reference signal corresponding to a first value of said second signal and a second reference signal corresponding to a second value of said second signal; and means for decaying said error signal when the value of said second signal is in the band defined between said first and second reference values.
Claim 19
Dependent Claim
236 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a function of the value of said second signal; and control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; means for generating a first reference signal corresponding to a first value of said second signal, a second reference signal corresponding to a second value of said reference signal less than the value of said first reference signal, and a third reference signal corresponding to a third value of said second signal less than the value of said second reference signal; said control signal generating means generating said control signal when the value of said second signal drops below said third reference signal; said error signal generating means including means for establishing an initial value of said error signal in accordance with the length of the time period that said second signal remains in the band defined between said second and third reference signals before dropping below the third reference signal.
Claim 20
Dependent Claim
236 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a function of the value of said second signal; and control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; means for generating a first reference signal corresponding to a first value of said second signal, a second reference signal corresponding to a second value of said reference signal less than the value of said first reference signal, and a third reference signal corresponding to a third value of said second signal less than the value of said second reference signal; said control signal generating means generating said control signal when the value of said second signal drops below said third reference signal; said error signal generating means including means for establishing an initial value of said error signal in accordance with the length of the time period that said second signal remains in the band defined between said second and third reference signals before dropping below the third reference signal.
Claim 21
Dependent Claim
199 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a function of the value of said second signal; control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; and means for generating a first reference signal corresponding to a first value of said second signal, a second reference signal corresponding to a second value of said reference signal less than the value of said first reference signal, and a third reference signal corresponding to a third value of said second signal less than the value of said second reference signal; said control signal generating means generating said control signal when the value of said second signal remains in the band defined between said second and third reference signals for a predetermined time period.
Claim 22
Dependent Claim
199 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a function of the value of said second signal; control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; and means for generating a first reference signal corresponding to a first value of said second signal, a second reference signal corresponding to a second value of said reference signal less than the value of said first reference signal, and a third reference signal corresponding to a third value of said second signal less than the value of said second reference signal; said control signal generating means generating said control signal when the value of said second signal remains in the band defined between said second and third reference signals for a predetermined time period.
Claim 23
Dependent Claim
187 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a functiOn of the value of said second signal; control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; and means for generating a first reference signal corresponding to a first value of said second signal and a second reference signal corresponding to a second value of said second signal; said control signal generating means including means for changing the value of said control signal by a constant amount which does not vary despite fluctuations in the value of said second signal or said error signal when the value of said second signal drops below the value of said second reference signal.
Claim 24
Dependent Claim
187 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a functiOn of the value of said second signal; control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; and means for generating a first reference signal corresponding to a first value of said second signal and a second reference signal corresponding to a second value of said second signal; said control signal generating means including means for changing the value of said control signal by a constant amount which does not vary despite fluctuations in the value of said second signal or said error signal when the value of said second signal drops below the value of said second reference signal.
Claim 25
Dependent Claim
36 words
The invention of claim 17: said initial value of said error signal being further a function of the value of said error signal when said second signal drops to the value of said first reference signal.
Claim 26
Dependent Claim
43 words
The invention of claim 17: said reference velocity generating means being responsive to a decrease in the value of said second signal to said first reference signal to equate the value of said reference velocity signal with the value of said first signal.
Claim 27
Dependent Claim
206 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a function of the value of said second signal; control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; and means for generating a first reference signal corresponding to a first value of said second signal and a second reference signal corresponding to a second value of said second signal; said error signal generating means including means for establishing an initial value of said error signal when the value of said second signal drops to said first reference level, said establishing means including means for storing the value of said error signal when said second signal drops to said first reference signal and establishing the value of said error signal as a function of said stored value of the error signal.
Claim 28
Dependent Claim
206 words
In a vehicle having a wheel and a brake for braking said wheel, an adaptive braking system for controlling actuation of said brake comprising: means for generating a first signal proportional to the rotational velocity of said wheel; means responsive to said first signal for generating a second signal proportional to acceleration and deceleration of said wheel; means for generating an error signal proportional to the time integral of a function of the value of said second signal; control means responsive to the values of said second signal and of said error signal for generating a control signal for controlling actuation of said brake; and means for generating a first reference signal corresponding to a first value of said second signal and a second reference signal corresponding to a second value of said second signal; said error signal generating means including means for establishing an initial value of said error signal when the value of said second signal drops to said first reference level, said establishing means including means for storing the value of said error signal when said second signal drops to said first reference signal and establishing the value of said error signal as a function of said stored value of the error signal.
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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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |