US5179526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for correcting the rotational speeds of vehicle wheels determined by wheel sensors
Assignee: Mercedes Benz Group AG
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Filing: 1991-06-03
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Granted: 1993-01-12
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Expires: 2011-06-03
Abstract
Abstract A method for correcting the rotational speeds of vehicle wheels determined by wheel sensors, a measurement of wheel speeds of the wheels of a vehicle being carried out, with specific driving conditions being that the vehicle is being neither accelerated nor braked and has no transverse acceleration. In a first part of the method, a matching of the measured wheel speeds is carried out under the specific driving conditions when the condition that the vehicle speed is below a first threshold value is satisfied. The matching of the measured wheel speeds is carried out by determining a matching factor for each of the two vehicle sides, so that, for example for the left vehicle side, matched wheel speeds are obtained from the measured wheel speeds. One of the matched wheel speeds of the left vehicle side is made equal to the associated measured wheel speed and the other of the two matched wheel speeds of the left vehicle side is obtained from the associated measured wheel by multiplying by the matchine factor of the left vehicle side, in such a way that the two matched wheel speeds of the left vehicle side assume the same value. In a second part of the method, the measured wheel speeds are balanced under the specific driving conditions when the condition that the vehicle speed is above a threshold value is satisfied. The balancing is carried out by determining a balancing factor for each wheel in relation to a reference wheel, in such a way that the balance wheel speed and the wheel speed of the reference wheel coincide with one another, and the measured wheel speeds are multiplied by the balancing factors determined in the second part of the method.
Inventors
- 👤 Richard Zimmer
- 👤 Armin Muller
- 👤 Martin Klarer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:23
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/489; B; B60; B60T; B60T8/00; B60T8/17; B60T8/172; G01P21/00; G01P21/02; G01P3/56; B60T2240/00; B60T2240/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
434 words
A method for correcting the rotational speeds of vehicle wheels determined by wheel sensors, comprising: measuring wheel speeds of individual wheels of a vehicle; determining balancing factors of the individual wheels under specific driving conditions, the specific driving conditions being that the vehicle is being neither accelerated nor braked and has no transverse acceleration; in a first part of the method, matching the measured wheel speeds under the specific driving conditions and when the vehicle speed is below a first threshold value, the vehicle speed and the specific driving conditions being determined from the measured wheel speeds, the matching of the measured wheel speeds including the step of determining a matching factor for each of the two vehicle sides so that the matched wheel speeds are obtained from the measured wheel speeds that are associated with the matched wheel speeds; one of the two matched wheel speeds of the left vehicle side being equal to its associated measured wheel speed, and the other of the two matched wheel speeds of the left vehicle side being obtained from its associated measured wheel speed by multiplying the matching factor of the left vehicle side, in such a way that the two matched wheel speeds of the left vehicle side have the same value; one of the two matched wheel speeds of the right vehicle side being equal to its associated measured wheel speed and the other of the two matched wheel speeds of the right vehicle side being obtained from its associated measured wheel speed by multiplying the matching factor of the right vehicle side, in such a way that the two matched wheel speeds of the right vehicle side have the same value; in a second part of the method, measuring the wheel speeds again to provide newly measured wheel speeds; balancing the newly measured wheel speeds under the specific driving conditions and when the condition that the vehicle speed is above a second threshold value is satisfied, to thereby provide balanced wheel speeds; determining from the newly measured wheel speeds, with the matching factors being taken into account, the vehicle speed and the specific driving conditions; wherein the step of balancing includes fixing one of the individual vehicle wheels as a reference wheel and determining a balancing factor for each individual vehicle wheel in relation to said reference wheel, in such a way that the balanced wheel speed coincides with the wheel speed of the reference wheel, and correcting measurements of wheel speeds measured after the balancing step by multiplying the wheel speeds measured after the balancing step by the corresponding determined balancing factors.
Claim 2
Independent Claim
434 words
A method for correcting the rotational speeds of vehicle wheels determined by wheel sensors, comprising: measuring wheel speeds of individual wheels of a vehicle; determining balancing factors of the individual wheels under specific driving conditions, the specific driving conditions being that the vehicle is being neither accelerated nor braked and has no transverse acceleration; in a first part of the method, matching the measured wheel speeds under the specific driving conditions and when the vehicle speed is below a first threshold value, the vehicle speed and the specific driving conditions being determined from the measured wheel speeds, the matching of the measured wheel speeds including the step of determining a matching factor for each of the two vehicle sides so that the matched wheel speeds are obtained from the measured wheel speeds that are associated with the matched wheel speeds; one of the two matched wheel speeds of the left vehicle side being equal to its associated measured wheel speed, and the other of the two matched wheel speeds of the left vehicle side being obtained from its associated measured wheel speed by multiplying the matching factor of the left vehicle side, in such a way that the two matched wheel speeds of the left vehicle side have the same value; one of the two matched wheel speeds of the right vehicle side being equal to its associated measured wheel speed and the other of the two matched wheel speeds of the right vehicle side being obtained from its associated measured wheel speed by multiplying the matching factor of the right vehicle side, in such a way that the two matched wheel speeds of the right vehicle side have the same value; in a second part of the method, measuring the wheel speeds again to provide newly measured wheel speeds; balancing the newly measured wheel speeds under the specific driving conditions and when the condition that the vehicle speed is above a second threshold value is satisfied, to thereby provide balanced wheel speeds; determining from the newly measured wheel speeds, with the matching factors being taken into account, the vehicle speed and the specific driving conditions; wherein the step of balancing includes fixing one of the individual vehicle wheels as a reference wheel and determining a balancing factor for each individual vehicle wheel in relation to said reference wheel, in such a way that the balanced wheel speed coincides with the wheel speed of the reference wheel, and correcting measurements of wheel speeds measured after the balancing step by multiplying the wheel speeds measured after the balancing step by the corresponding determined balancing factors.
Claim 3
Dependent Claim
18 words
The method of claim 1, further including the step of updating the balancing factors at specific time intervals.
Claim 4
Dependent Claim
23 words
The method of claim 1, further including the step of updating the balancing factors according to a specific distance covered by the vehicle.
Claim 5
Dependent Claim
44 words
The method of claim 3, further including determining a criterion for the updating of the balancing factors by taking weighted account of the time interval between the last updating of the balancing factors and the distance covered by the vehicle after said last update.
Claim 6
Dependent Claim
51 words
The method of claim 1, wherein the specific driving conditions that the vehicle is being neither accelerated nor braked is derived in the first part of the method when a wheel acceleration or wheel accelerations formed from the measured wheel speed or measured wheel speeds are below a third threshold value.
Claim 7
Dependent Claim
64 words
The method of claim 1, wherein the specific driving conditions that the vehicle is being neither accelerated nor braked is derived in the first part of the method when the amount of the difference between the average value of the wheel speeds of the front axle and the average value of the wheel speeds of the rear axle is below a third threshold value.
Claim 8
Dependent Claim
62 words
The method of claim 1, wherein the specific driving condition that the vehicle has no transverse acceleration is derived in the first part of the method when the amount of the difference between the average value of the wheel speeds of the front axle and the average value of the wheel speeds of the rear axle is below a third threshold value.
Claim 9
Dependent Claim
54 words
The method of claim 1, wherein the specific driving condition that the vehicle has no transverse acceleration is derived in the first part of the method when the amount of the difference between wheel speeds of wheels, which are mounted on different vehicle sides on the same axle, falls below a third threshold value.
Claim 10
Dependent Claim
51 words
The method of claim 1, wherein the specific driving conditions that the vehicle is being neither accelerated nor braked is derived in the second part of the method when a wheel acceleration or wheel accelerations formed from at least one of the matched wheel speeds are below a third threshold value.
Claim 11
Dependent Claim
64 words
The method of claim 1, wherein the specific driving conditions that the vehicle is being neither accelerated nor braked is derived in the second part of the method when the amount of the difference between the average value of the wheel speeds of the front axle and the average value of the wheel speeds of the rear axle is below a third threshold value.
Claim 12
Dependent Claim
62 words
The method of claim 1, wherein the specific driving condition that the vehicle has no transverse acceleration is derived in the second part of the method when the amount of the difference between the average value of the wheel speeds of the front axle and the average value of the wheel speeds of the rear axle is below a third threshold value.
Claim 13
Dependent Claim
55 words
The method of claim 1, wherein the specific driving condition that the vehicle has no transverse acceleration is derived in the second part of the method when the amount of the difference between matched wheel speeds of wheels, which are mounted on different vehicle sides on the same axle, falls below a third threshold value.
Claim 14
Dependent Claim
50 words
The method of claim 1, wherein the specific driving conditions that the vehicle is being neither accelerated nor braked is derived in at least one of the first and second parts of the method from control signals of at least one of an anti-lock system and a drive-slip control system.
Claim 15
Dependent Claim
44 words
The method of claim 2, further including determining a criterion for the updating of the balancing factors by taking weighted account of the time interval between the last updating of the balancing factors and the distance covered by the vehicle after said last update.
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) | 1996-01-12 | 1996-07-13 | 1997-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-12 | 2000-07-13 | 2001-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-12 | 2004-07-13 | 2005-01-12 | $7700.00 | Window Closed / Lapsed |