US3704043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive braking control system
Assignee: Bendix Corp
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Filing: 1970-09-10
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Granted: 1972-11-28
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Expires: 1990-09-10
Abstract
Abstract An anti-skid control system for operating inlet and outlet valves of a pressure modulator. The control system uses the rate of change of rotational velocity of the wheels to give an acceleration or deceleration signal. After given acceleration or deceleration rates have been exceeded, the appropriate valve is variably pulsed to give brake pressure build and decay rates that are directly proportioned to wheel acceleration or deceleration. A deceleration responsive switch is used to vary the length of the pressure decay cycle to account for varying coefficients of friction. A delay prevents an initial deceleration rate from operating the valves unless the deceleration rate still exists after a time period.
Inventors
- 👤 George B Hickner
- 👤 Donald W Howard
- 👤 Paul S Houseman
- 👤 Ralph W Carp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:08
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
222 words
In a vehicle adaptive braking system for relieving braking pressure in the brake of a controlled vehicle wheel to prevent said controlled wheel from locking; means for generating a first signal proportional to the acceleration and deceleration of said controlled wheel; first comparing means generating a second signal when the magnitude of said first signal exceeds a first reference value; first pulse generating means generating a pulsed output signal at a frequency proportional to the magnitude of said second signal, said pulse generating means producing a substantially constant output signal when the magnitude of said second signal exceeds a second reference value; outlet valve means responsive to the pulsed output signal of said first pulse generating means to sequentially open and close communication from said brake to thereby decay braking pressure at a rate proportional to the frequency of said pulsed output signal, said outlet valve means being responsive to said constant output signal to decay braking pressure at a substantially constant rate; timing means generating an output signal a predetermined time period after actuation of said timing means; second comparing means generating an output signal actuating said timing means when said first signal exceeds said first reference value; gating means preventing operation of said outlet valve means until both said timing means and said pulse generating means produce an output signal.
Claim 2
Dependent Claim
222 words
In a vehicle adaptive braking system for relieving braking pressure in the brake of a controlled vehicle wheel to prevent said controlled wheel from locking; means for generating a first signal proportional to the acceleration and deceleration of said controlled wheel; first comparing means generating a second signal when the magnitude of said first signal exceeds a first reference value; first pulse generating means generating a pulsed output signal at a frequency proportional to the magnitude of said second signal, said pulse generating means producing a substantially constant output signal when the magnitude of said second signal exceeds a second reference value; outlet valve means responsive to the pulsed output signal of said first pulse generating means to sequentially open and close communication from said brake to thereby decay braking pressure at a rate proportional to the frequency of said pulsed output signal, said outlet valve means being responsive to said constant output signal to decay braking pressure at a substantially constant rate; timing means generating an output signal a predetermined time period after actuation of said timing means; second comparing means generating an output signal actuating said timing means when said first signal exceeds said first reference value; gating means preventing operation of said outlet valve means until both said timing means and said pulse generating means produce an output signal.
Claim 3
Dependent Claim
35 words
The invention of claim 1; and switch means actuated when the vehicle operator effects a brake application; said gating means including means inhibiting operation of said outlet valve means until actuation of said switch means.
Claim 4
Dependent Claim
29 words
The invention of claim 2; and latching means transmitting a signal to said gatIng means after said timing means generates an output signal until said switch means is deactivated.
Claim 5
Dependent Claim
44 words
The invention of claim 1; and means responsive to vehicle deceleration delaying actuation of said outlet valve means when the vehicle decelerates at a lesser rate but permitting immediate actuation of said outlet valve means when said vehicle is decelerated at a greater rate.
Claim 6
Dependent Claim
118 words
The invention of claim 1; and third comparing means generating a third output signal when the magnitude of said first signal exceeds a third reference value; second pulse generating means generating a pulsed output signal at a frequency proportional to the magnitude of said third output signal, said pulse generating means producing a substantially constant output signal when the magnitude of said third output signal exceeds a fourth reference value; inlet valve means responsive to the pulsed output of said second pulse generating means to sequentially open and close communication into said brake, said inlet valve means being responsive to said substantially constant output signal of said second pulse generating means to continuously actuate said inlet valve means.
Claim 7
Dependent Claim
31 words
The invention of claim 5; said gating means preventing operation of said normally open inlet valve means until both said timing means and said pulse generating means produces an output signal.
Claim 8
Dependent Claim
23 words
The invention of claim 5; and means for varying the width of the pulses generated by said first and second pulse generating means.
References Cited (Backward Citations)
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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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |