Patent US4063555A successfully refreshed from Google Patents.
Patent US3637264A successfully refreshed from Google Patents.
US3637264A
Expired / Lapsed
US
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Antilocking control for pressure actuated brakes
Assignee: Robert Bosch GmbH
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Filing: 1970-03-18
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Granted: 1972-01-25
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Expires: 1990-03-18
Abstract
Abstract The pressure of the brake-actuating fluid in an antilocking brake control system is varied by pulsing the control valve or valves for durations which are varied to be greater or lesser than the period of that limiting frequency above which the brake system can not respond. In the former case, a rapid increase in fluid pressure or a rapid decrease in fluid pressure occurs, whereas in the latter case, a less rapid average or net increase or decrease in fluid pressure to which the brake system responds occurs. These conditions are controlled in dependence on the rotational behavior of the vehicles wheel or wheels and more especially in dependence on predetermined changes in angular velocity of the wheel. Moreover, either variation in pulse duration at fixed frequency or variation in frequency at fixed pulse duration may be effected during high-frequency pulsing so as further to alter the net increase or decrease in fluid pressure. This further alteration is effected as a function of time from the beginning of the high-frequency pulsing.
Inventors
- 👤 Heinz Leiber
- 👤 Anton Rodi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:28
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; B60T8/32; B60T8/34; B60T8/42; B60T8/50; B60T8/5006; B60T8/5075; B60T8/58
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
148 words
An antilocking pressure actuated vehicle brake system including a wheel having a brake, actuator means for said brake, a source of pressurized fluid, at least one magnetic valve connected between said actuator means and said source for controlling said actuator means, and control means for said valve including sensor means responsive to the rotational behavior of said wheel, said control means generating control signals for causing the fluid pressure applied to the brake to be selectively rapidly decreased, held substantially constant, or rapidly increased, the improvement wherein: said control means further includes current pulse generating means for generating pulsed control signals, in addition to the above-defined control signals, for a given time duration, said pulsed control signals selectively effecting a reduction in the rate of at least one of said rapid pressure decrease and pressure increase, or a maintenance of said constant pressure, resulting from said control signals.
Claim 2
Dependent Claim
148 words
An antilocking pressure actuated vehicle brake system including a wheel having a brake, actuator means for said brake, a source of pressurized fluid, at least one magnetic valve connected between said actuator means and said source for controlling said actuator means, and control means for said valve including sensor means responsive to the rotational behavior of said wheel, said control means generating control signals for causing the fluid pressure applied to the brake to be selectively rapidly decreased, held substantially constant, or rapidly increased, the improvement wherein: said control means further includes current pulse generating means for generating pulsed control signals, in addition to the above-defined control signals, for a given time duration, said pulsed control signals selectively effecting a reduction in the rate of at least one of said rapid pressure decrease and pressure increase, or a maintenance of said constant pressure, resulting from said control signals.
Claim 3
Dependent Claim
60 words
The antilocking brake system as defined in claim 1, whereiN said sensor means has three outputs dependent, respectively, upon attainment of a first threshold of wheel deceleration, a second threshold of wheel deceleration, and a threshold of wheel acceleration, and wherein this ratio of control pulse duration to subsequent control pulse interval alternates between discrete values determined by said outputs.
Claim 4
Dependent Claim
31 words
The antilocking brake system as defined in claim 2, wherein said ratio alternates under the influence of the control signals between values of zero, at least one finite value, and infinity.
Claim 5
Dependent Claim
24 words
The antilocking brake system as defined in claim 2 including means for continuously varying said ratio dependent on said rotational behavior of said wheel.
Claim 6
Dependent Claim
63 words
The antilocking brake system as defined in claim 1 wherein said valve controls the inlet to said actuator means and is normally closed, said sensor means having an output for opening said valve for relatively long periods whereby the pressure increases rapidly at said actuator means, said sensor means having another output during which said pulse-generating means produces a less rapidly increasing pressure.
Claim 7
Dependent Claim
63 words
The antilocking brake system as defined in claim 1 wherein said valve controls the outlet from said actuator means and is normally closed, said sensor means having an output for opening said valve for relatively long periods whereby the fluid pressure at said actuator means decreases rapidly, said sensor means having another output during which said pulse-generating means produces less rapidly decreasing pressure.
Claim 8
Dependent Claim
36 words
The antilocking brake system as defined in claim 1 wherein said valve is a three-way valve which in one position effects a reduction in brake pressure and in another position effects an increase in brake pressure.
Claim 9
Dependent Claim
47 words
The antilocking brake system as defined in claim 1 wherein said pulse-generating means is actuated only during certain outputs from said sensor means, and said system including a time control for varying said ratio as a function of time from the beginning of pulse generator means operation.
Claim 10
Dependent Claim
22 words
In a vehicle antilocking brake system as defined in claim 8 including means for varying the actuating duty cycle of said pulsing.
Claim 11
Dependent Claim
28 words
The antilocking control system as defined in claim 1, wherein the ratio alternates under the influence of the control signals of the sensor means between discrete, fixed values.
Claim 12
Dependent Claim
166 words
In a vehicle antilocking brake system of the type including a wheel, a braking device for said wheel, a source of pressurized actuating fluid for said braking device, valve means for selectively admitting pressurized fluid to and dumping pressurized fluid from said braking device, and sensor means for controlling said valve means in accord with predetermined changes in angular velocity of said wheel, the improvement which comprises: means responsive to at least one condition of wheel angular velocity change for pulsing said valve means to effect a rapidly fluctuating net change in fluid pressure at said braking device, and responsive to at least one other condition of wheel angular velocity change for pulsing said valve means to effect a less rapidly fluctuating net change in fluid pressure at said braking device, in which the frequency of such pulsing is greater than the frequency limit at which said braking device may respond to pressure changes, whereby said braking device responds to the average of said net change.
Claim 13
Dependent Claim
166 words
In a vehicle antilocking brake system of the type including a wheel, a braking device for said wheel, a source of pressurized actuating fluid for said braking device, valve means for selectively admitting pressurized fluid to and dumping pressurized fluid from said braking device, and sensor means for controlling said valve means in accord with predetermined changes in angular velocity of said wheel, the improvement which comprises: means responsive to at least one condition of wheel angular velocity change for pulsing said valve means to effect a rapidly fluctuating net change in fluid pressure at said braking device, and responsive to at least one other condition of wheel angular velocity change for pulsing said valve means to effect a less rapidly fluctuating net change in fluid pressure at said braking device, in which the frequency of such pulsing is greater than the frequency limit at which said braking device may respond to pressure changes, whereby said braking device responds to the average of said net change.
Claim 14
Dependent Claim
91 words
An antilocking control system for a vehicle brake system responsive to pressure variations in an actuating fluid, said brake system being incapable of responding to pressure variations above a predetermined frequency, said control system comprising, in combination; valve means for selectively increasing and decreasing actuating fluid pressure applied to said brake system, and control means for pulsing said valve means for durations both greater and less than the period of said predetermined frequency to produce, respectively, rapid and less rapid changes in actuating fluid pressurE to which said brake system responds.
Claim 15
Dependent Claim
91 words
An antilocking control system for a vehicle brake system responsive to pressure variations in an actuating fluid, said brake system being incapable of responding to pressure variations above a predetermined frequency, said control system comprising, in combination; valve means for selectively increasing and decreasing actuating fluid pressure applied to said brake system, and control means for pulsing said valve means for durations both greater and less than the period of said predetermined frequency to produce, respectively, rapid and less rapid changes in actuating fluid pressurE to which said brake system responds.
Claim 16
Dependent Claim
34 words
The antilocking control system as defined in claim 12, including means for varying the actuating duty cycle of said pulsing when said durations are of lesser value than the period of said predetermined frequency.
Claim 17
Dependent Claim
183 words
An antilocking control system for a vehicle brake system including a wheel having a brake, actuator means for said brake, a source of pressurized fluid, an inlet and outlet valve connected between said actuator means and said source for controlling said actuator means and control means for said valve including sensor means responsive to the rotational behavior of said wheel, said control means generating control signals for causing the fluid pressure applied to the brake to be selectively rapidly decreased, held substantially constant or rapidly increased, the improvement wherein said control means further comprises: a pulse generator means for said inlet valve; a pulse generator means for said outlet valve; first gate means; means connecting said sensor means and said inlet pulse generator means to each other and to said first gate means, said first gate means selectively delivering to said inlet valve pulsed control signals; second gate means; and means connecting said sensor means and said outlet pulse generator means to each other and to said second gate means, said second gate means selectively delivering to said outlet valve pulsed control signals.
Claim 18
Dependent Claim
183 words
An antilocking control system for a vehicle brake system including a wheel having a brake, actuator means for said brake, a source of pressurized fluid, an inlet and outlet valve connected between said actuator means and said source for controlling said actuator means and control means for said valve including sensor means responsive to the rotational behavior of said wheel, said control means generating control signals for causing the fluid pressure applied to the brake to be selectively rapidly decreased, held substantially constant or rapidly increased, the improvement wherein said control means further comprises: a pulse generator means for said inlet valve; a pulse generator means for said outlet valve; first gate means; means connecting said sensor means and said inlet pulse generator means to each other and to said first gate means, said first gate means selectively delivering to said inlet valve pulsed control signals; second gate means; and means connecting said sensor means and said outlet pulse generator means to each other and to said second gate means, said second gate means selectively delivering to said outlet valve pulsed control signals.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |