US5299131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of correcting the rotating speed of vehicle wheels sensed by wheel sensors
Assignee: Robert Bosch GmbH
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Filing: 1988-11-12
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Granted: 1994-03-29
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Expires: 2008-11-12
Abstract
Abstract Vehicle speed is measured during slip-free travel of the wheels and compared with the wheel speeds to determine correction values which correct for different wheel diameters. The correction values are used to continuously correct the wheel speeds.
Inventors
- 👤 Hardy Haas
- 👤 Manfred Meissner
- 👤 Alfred Sigl
- 👤 Andreas Schlichenmaier
- 👤 Ulrich Schwabe
- 👤 Hans Guttler
- 👤 Norbert Leibbrand
- 👤 Jurgen Brauninger
- 👤 Dieter Worner
- 👤 Jochen Schafer
- 👤 Frank Bedrna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:52
CPC Classifications
G; G01; G01P; G01P21/00; G01P21/02; B; B60; B60T; B60T8/00; B60T8/17; B60T8/173; B60G; B60G2400/00; B60G2400/20; B60G2400/208; B60G2800/00; B60G2800/70; B60G2800/702; B60T2240/00; B60T2240/08
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
126 words
Method for correcting the rotating speed of vehicle wheels, said method comprising the following steps: measuring the rotating speed of each vehicle wheel, determining when there is no slippage of said vehicle wheels, determining the difference in speed between each two vehicle wheels when there is no slippage of said vehicle wheels, determining the minimum said difference in speed, determining the average speed of the two wheels which have said minimum difference in speed, wheels other than said two wheels which have said difference in speed being remaining wheels, determining correction values for each said remaining wheel based on the speed of each said remaining wheel and said average speed, and correcting the measured speed of each said remaining wheel based on respective said correction values.
Claim 2
Dependent Claim
126 words
Method for correcting the rotating speed of vehicle wheels, said method comprising the following steps: measuring the rotating speed of each vehicle wheel, determining when there is no slippage of said vehicle wheels, determining the difference in speed between each two vehicle wheels when there is no slippage of said vehicle wheels, determining the minimum said difference in speed, determining the average speed of the two wheels which have said minimum difference in speed, wheels other than said two wheels which have said difference in speed being remaining wheels, determining correction values for each said remaining wheel based on the speed of each said remaining wheel and said average speed, and correcting the measured speed of each said remaining wheel based on respective said correction values.
Claim 3
Dependent Claim
38 words
Method as in claim 1 wherein said determining of no slippage is made only when there is no slippage control in the operation, said slippage control comprising at least one of ABS, ASR, and engine drag torque control.
Claim 4
Dependent Claim
19 words
Method as in claim 2 wherein said differences are determined only after an elapsed time T of vehicle movement.
Claim 5
Dependent Claim
35 words
Method as in claim 3 wherein, when slippage control is detected, the correction value is determined when a waiting time has elapsed, and no further correction values are determined after said waiting time has elapsed.
Claim 6
Dependent Claim
16 words
Method as in claim 4 wherein said waiting time is increased in dependency upon time T.
Claim 7
Dependent Claim
28 words
Method as in claim 3 wherein said average speed is determined only when engine torque is below a prescribed value, said prescribed value decreasing with elapsed time T.
Claim 8
Dependent Claim
32 words
Method as in claim 3 wherein further comprising determining a vehicle acceleration, said differences being determined only when said acceleration is within prescribed limits, said prescribed limits decreasing with elapsed time T.
Claim 9
Dependent Claim
35 words
Method as in claim 3 further comprising determining a transverse vehicle acceleration and determining said differences only when said transverse acceleration is less than a prescribed value, said prescribed value decreasing with elapsed time T.
Claim 10
Dependent Claim
17 words
Method as in claim 1 wherein said average speed is determined only when there is no braking.
Claim 11
Dependent Claim
20 words
Method as in claim 1 wherein said average speed is determined only when engine torque is below a prescribed value.
Claim 12
Dependent Claim
20 words
Method as in claim 1 wherein said differences are determined only when said average speed is within a prescribed range.
Claim 13
Dependent Claim
23 words
Method as in claim 1 further comprising determining a vehicle acceleration, said difference being determined only when said acceleration is within prescribed limits.
Claim 14
Dependent Claim
27 words
Method as in claim 1 further comprising determining transverse vehicle acceleration and determining said differences only when said transverse vehicle acceleration is less than a prescribed value.
Claim 15
Dependent Claim
41 words
Method as in claim 1 wherein said wheel speed differences are determined at successive times for each two wheels, said minimum difference being determined by taking the mean of successively determined differences for each two wheels and selecting the lowest mean.
Claim 16
Dependent Claim
43 words
Method as in claim 14 wherein said means is a weighted means ΔV determined at time t according to ##EQU7## where m is a constant, ΔV(t-1) is the mean determined at time (t-1), and ΔV(t) is the difference determined at successive time t.
Claim 17
Dependent Claim
34 words
Method as in claim 1 wherein said correction values are determined only when said wheels having said minimum difference in speed have speeds which deviate from each other by less than a prescribed value.
Claim 18
Dependent Claim
47 words
Method as in claim 1 wherein the measured speeds V i of the remaining wheels are corrected according to V Ki =K 1 V i where K i is the correction value for the remaining wheel and V Ki is the corrected speed of the remaining wheel.
Claim 19
Dependent Claim
59 words
Meethod as in claim 17 wherein said correction values are determined according to K 1 =V/V i for each remaining wheel i, where K i is the correction value for the remaining wheel i, V is the average speed of the two wheels which have the minimum difference, and V i is the speed of the remaining wheel i.
Claim 20
Dependent Claim
53 words
Method as in claim 17 wherein said correction value K is a weighted correction value K i determined at time t according to ##EQU8## where m is a constant, K i (-1) is the correction value determined at time (t-1), and K i (t) is the correction value determined at successive time t.
Claim 21
Dependent Claim
26 words
Method as in claim 19 further comprising determining the deviation of K i (t) from K i (t-1) and limiting said deviation to a prescribed value.
Claim 22
Dependent Claim
23 words
Method as in claim 17 further comprising determining the deviation of K i from 1 and limiting said deviation to a prescribed value.
Claim 23
Dependent Claim
12 words
Method as in claim 12 wherein said prescribed value decreases with time.
Claim 24
Dependent Claim
55 words
Method as in claim 1 wherein said correction values are determined according to K i =V/V i , where K i is the correction value for the remaining wheel i, V is the average speed of the two wheels which have the minimum difference, and V i is the speed of the remaining wheel i.
Claim 25
Dependent Claim
67 words
Method as in claim 1 further comprising storing said correction values for each said remaining wheel, newly determining correction values after said correction values are stored, comparing newly determined correction values to respective stored correction values, and replacing said stored correction values only with said new determined correction values only when said newly determined correction values exceed respective said stored correction values by respective prescribed limit values.
Claim 26
Dependent Claim
19 words
Method as in claim 24 wherein in said prescribed limit values decrease with elapsed time T of vehicle movement.
Claim 27
Dependent Claim
21 words
Method as in claim 24 wherein said stored correction values are replaced only after a minimum elapsed time after vehicle departure.
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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) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |