US5372409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-pressure operated boosters for vehicle braking systems
Assignee: ZF International UK Ltd
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Filing: 1993-07-30
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Granted: 1994-12-13
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Expires: 2013-07-30
Abstract
Abstract Energization of a fluid-pressure operated booster is controlled solely by operation of a solenoid-operated valve device, suitably first and second solenoid-operated valves, responsive to signals from an electronic controller. The construction of the booster is therefore modified in comparison with known boosters by the omission of the conventional mechanical valve adapted to be operated by the pedal for normal operation of the booster.
Inventors
- 👤 Glyn P. R. Farr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:12
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/321; B60T8/3255; B60T8/326; B60T8/3265; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; B60T13/57; B60T13/66; B60T13/72; B60T8/34; B60T8/44; B60T8/441; B60T8/447; B60T8/448; B60T8/48; B60T8/4809; B60T8/4827; B60T8/4845; B60T8/4854; Y; Y10; Y10S; Y10S188/00; Y10S188/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
242 words
A vehicle braking system comprising a brake on a wheel of a vehicle, a wheel speed sensor for sensing a behavior of said wheel and emitting a wheel speed signal for generating a hydraulic pressure, a hydraulic master cylinder for applying the brake, a booster for assisting operation of said master cylinder, an electronic controller receiving signals from said speed sensor, the electronic controller issuing an energizing current response to said signals, first and second solenoid operated valves, said first solenoid operated valve being movable between a first normally closed position and an open position, said second solenoid operated valve being between a first normally open position and a closed position, said first and second solenoid operated valves operating in response to said energizing current from said electronic controller to progressively control and monitor an energization of said booster in accordance with said energizing current, the sole means for energizing the booster being by operating said first and second solenoid operated valves between their respective open and closed positions, additionally comprising a member responsive to operation of a pedal, wherein said booster has an output rod and electrical means comprising a first load cell associated with said member, and a second load cell associated with said output rod, the electrical means being responsive to an operating force and emitting electrical signals to said electronic controllers, said electronic controller issuing said energizing current in response to said wheelspeed signal and said electrical signals.
Claim 2
Dependent Claim
242 words
A vehicle braking system comprising a brake on a wheel of a vehicle, a wheel speed sensor for sensing a behavior of said wheel and emitting a wheel speed signal for generating a hydraulic pressure, a hydraulic master cylinder for applying the brake, a booster for assisting operation of said master cylinder, an electronic controller receiving signals from said speed sensor, the electronic controller issuing an energizing current response to said signals, first and second solenoid operated valves, said first solenoid operated valve being movable between a first normally closed position and an open position, said second solenoid operated valve being between a first normally open position and a closed position, said first and second solenoid operated valves operating in response to said energizing current from said electronic controller to progressively control and monitor an energization of said booster in accordance with said energizing current, the sole means for energizing the booster being by operating said first and second solenoid operated valves between their respective open and closed positions, additionally comprising a member responsive to operation of a pedal, wherein said booster has an output rod and electrical means comprising a first load cell associated with said member, and a second load cell associated with said output rod, the electrical means being responsive to an operating force and emitting electrical signals to said electronic controllers, said electronic controller issuing said energizing current in response to said wheelspeed signal and said electrical signals.
Claim 3
Dependent Claim
43 words
A braking system according to claim 1, wherein said booster is adapted to be controlled by said electronic controller is response to a wheel anti-lock signal from said wheel speed sensor, whereby to reduce the level of hydraulic pressure applied to said brake.
Claim 4
Dependent Claim
38 words
A vehicle braking system according to claim 1, wherein said booster is adapted to modify its boost ratio to provide substantially the same vehicle deceleration for a given predetermined pedal effort irrespective of how laden said vehicle is.
Claim 5
Dependent Claim
34 words
A vehicle braking system according to claim 1, wherein said booster is adapted to be operated by said electronic controller to hold said vehicle on a hill or incline with a clutch pedal depressed.
Claim 6
Dependent Claim
247 words
A vehicle braking system comprising a brake on a wheel, a master cylinder for generating a hydraulic pressure for applying said brake, a fluid-pressure operated booster for operating said master cylinder, said booster comprising a piston and an output rod, the output rod being connected to the master cylinder for operating the master cylinders, said piston and said output rod causing signals to be generated indicative of input and output forces of said booster, a wheel speed sensor sensing a behavior of said wheel and emitting a wheel speed signal an electronic controller responsive to said wheel speed signal and said signals indicative of said input and output forces and adapted to emit output signals, and a modulator for providing modulation of a supply of fluid from said master cylinder to said brake in response to said output signals from said electronic controller, said modulator including first and second solenoid operated valves, said first solenoid operated valve being movable between a first normally closed position and an open position, said second solenoid operated valve being movable between a first normally open position and a closed position, said first and second solenoid operated valves operating, in response to said output signals from said electronic controller to progressively control and monitor said modulation of brake applying fluid in accordance with said output signals, the sole means for modulating the supply of fluid being by operating said first and second solenoid operated valves between their respective open and closed positions.
Claim 7
Dependent Claim
247 words
A vehicle braking system comprising a brake on a wheel, a master cylinder for generating a hydraulic pressure for applying said brake, a fluid-pressure operated booster for operating said master cylinder, said booster comprising a piston and an output rod, the output rod being connected to the master cylinder for operating the master cylinders, said piston and said output rod causing signals to be generated indicative of input and output forces of said booster, a wheel speed sensor sensing a behavior of said wheel and emitting a wheel speed signal an electronic controller responsive to said wheel speed signal and said signals indicative of said input and output forces and adapted to emit output signals, and a modulator for providing modulation of a supply of fluid from said master cylinder to said brake in response to said output signals from said electronic controller, said modulator including first and second solenoid operated valves, said first solenoid operated valve being movable between a first normally closed position and an open position, said second solenoid operated valve being movable between a first normally open position and a closed position, said first and second solenoid operated valves operating, in response to said output signals from said electronic controller to progressively control and monitor said modulation of brake applying fluid in accordance with said output signals, the sole means for modulating the supply of fluid being by operating said first and second solenoid operated valves between their respective open and closed positions.
Claim 8
Dependent Claim
43 words
A braking system according to claim 5, wherein said booster is adapted to be controlled by said electronic controller is response to a wheel anti-lock signal from said wheel speed sensor, whereby to reduce the level of hydraulic pressure applied to said brake.
Claim 9
Dependent Claim
38 words
A vehicle braking system according to claim 5, wherein said booster is adapted to modify its boost ratio to provide substantially the same vehicle deceleration for a given predetermined pedal effort irrespective of how laden said vehicle is.
Claim 10
Dependent Claim
34 words
A vehicle braking system according to claim 5, wherein said booster is adapted to be operated by said electronic controller to hold said vehicle on a hill or incline with a clutch pedal depressed.
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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) | 1997-12-12 | 1998-06-13 | 1998-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-12 | 2002-06-13 | 2002-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-12 | 2006-06-13 | 2006-12-13 | $7700.00 | Window Closed / Lapsed |