US5255194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for maintaining a vehicle equipped with ABS in driving direction during lateral skidding
Assignee: Robert Bosch GmbH
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Filing: 1989-08-16
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Granted: 1993-10-19
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Expires: 2009-08-16
Abstract
Abstract System for preventing skidding when the dynamic limits of driving are surpassed, e.g., when the vehicle skids laterally during excessive curve speed, by subjecting forceful braking at least to the front wheels, even to the point of locking. Several systems for detecting skidding which would effect such braking are possible.
Inventors
- 👤 Rolf Schaufelberger
- 👤 Herbert Demel
- 👤 Elmar Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:48
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1755; B60T8/176; B60T8/1766; B60T2230/00; B60T2230/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
110 words
System for maintaining direction of movement of the center of gravity of a vehicle equipped with front wheels and rear wheels and an antilock brake system which varies brake pressure at the wheels in dependency upon movement behavior of the wheels, said movement behavior including at least one of wheel speed, wheel deceleration, wheel acceleration, and slippage, said system comprising means for detecting lateral skidding of the vehicle, and means for shutting down the antilock braking system acting on the front wheels and automatically subjecting the front wheels to braking which is sufficiently forceful to cause slippage of the front wheel when lateral skidding of the vehicle has been detected.
Claim 2
Dependent Claim
110 words
System for maintaining direction of movement of the center of gravity of a vehicle equipped with front wheels and rear wheels and an antilock brake system which varies brake pressure at the wheels in dependency upon movement behavior of the wheels, said movement behavior including at least one of wheel speed, wheel deceleration, wheel acceleration, and slippage, said system comprising means for detecting lateral skidding of the vehicle, and means for shutting down the antilock braking system acting on the front wheels and automatically subjecting the front wheels to braking which is sufficiently forceful to cause slippage of the front wheel when lateral skidding of the vehicle has been detected.
Claim 3
Dependent Claim
60 words
System in accordance with claim 1 further comprising means for at least partially shutting down the antilock braking system acting on the rear wheels and automatically subjecting the rear wheels to braking which is sufficiently forceful to cause slippage of the rear wheels to maintain lateral skidding of the rear wheels when lateral skidding of the vehicle has been detected.
Claim 4
Dependent Claim
109 words
System in accordance with claim 1 wherein said means for detecting lateral skidding of the vehicle comprises: means for forming a difference between duration of pressure reduction and duration of pressure build-up at at least one front wheel during a total control time, means for forming a difference between duration of pressure reduction and duration of pressure build-up at at least one rear wheel during said total control time, means for forming a sum of said differences, means for dividing said sum by said total control time to form a quotient, and means for providing an output signal indicating lateral skidding when said quotient exceeds a prescribed threshold value.
Claim 5
Dependent Claim
98 words
System in accordance with claim 1 wherein said means for detecting lateral skidding comprises means for determining vehicle velocity V F at times t 1 and t 2 , means for determining transverse vehicle acceleration a q at times t 1 and t 2 , means for forming a lateral skidding value S w and a q and V f at times t 1 and t 2 and forming an absolute value |S w |, and means for providing an output signal indicating lateral skidding when said absolute value |S w | exceeds a prescribed threshold value S.
Claim 6
Dependent Claim
20 words
System in accordance with claim 4 wherein said lateral skidding value S w is determined according to the equation ##EQU4##
Claim 7
Dependent Claim
83 words
System as in claim 1 wherein said means for detecting lateral skidding comprises means for determining front and rear inclined position rigidities C SF and C SR ; means for determining distances L F and L R from gravity center to front and rear wheels; means for determining the movement of inertia Θ z of the vehicle around a vertical axis; means for determining the steering angle δ and its derivative δ; and means for detecting skidding A according to the equation ##EQU5##
Claim 8
Dependent Claim
83 words
System as in claim 1 comprising means for reducing the the brake pressure in increments between between two pressure build-ups, means for determining the pressure reduction time, means for adding the pressure reduction increments to form a sum when the wheel deceleration is between two limits, means for subtracting the increment from said sum when the wheel deceleration is outside said limits, and means for indicating skidding when said pressure reduction time and said sum exceed prescribed thresholds at at least two wheels.
Claim 9
Dependent Claim
15 words
System as in claim 7 wherein said at least two wheels are the rear wheels.
Claim 10
Dependent Claim
19 words
System as in claim 7 wherein said at least two wheels are a front wheel and a rear wheel.
Claim 11
Dependent Claim
19 words
System as in claim 9 wherein said at least two wheels are a front wheel and both rear wheels.
Claim 12
Dependent Claim
25 words
System as in claim 7 wherein said means for adding and subtracting increments are operative only after a prescribed pressure reduction threshold has been reached.
Claim 13
Dependent Claim
16 words
System as in claim 7 wherein sad means for adding and means for subtracting comprise counters.
Claim 14
Dependent Claim
15 words
System as in claim 7 further comprising means for time filtering said wheel deceleration signals.
Claim 15
Dependent Claim
26 words
System as in claim 7 further comprising means for determining a vehicle deceleration from said wheel speeds, said skidding indication further depending on said vehicle deceleration.
Claim 16
Dependent Claim
32 words
System as in claim 14 further comprising means for determining when said vehicle deceleration falls below a prescribed threshold, skidding being indicated only when said vehicle deceleration falls below said prescribed threshold.
Claim 17
Dependent Claim
42 words
System as in claim 15 further comprising means for filtering said wheel deceleration signals, and means for subtracting the vehicle deceleration from the filtered wheel deceleration signals to form a difference, skidding being indicated only when said difference exceeds a prescribed threshold.
Claim 18
Dependent Claim
23 words
System as in claim 15 wherein lateral skidding is indicated when the vehicle deceleration determined from the wheel speeds fall below -1 g.
Claim 19
Dependent Claim
37 words
System as in claim 1 further comprising means for determining when wheel loads on one side of the vehicle are increased, skidding being indicated when said wheel loads are increased on one side exceeding a prescribed time.
Claim 20
Dependent Claim
48 words
System as in claim 1 further comprising means for determining when wheel loads on one side of the vehicle one increased, and means for determining the steering angle δ, skidding being indicated when said load on one side exceeds a plausibility limit which varies with said steering angle.
Claim 21
Dependent Claim
16 words
System as in claim 1 wherein said front wheels are locked when lateral skidding is detected.
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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) | 1996-10-18 | 1997-04-19 | 1997-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-18 | 2001-04-19 | 2001-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-18 | 2005-04-19 | 2005-10-19 | $7700.00 | Window Closed / Lapsed |