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US4992945A
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Method and apparatus for distinguishing skidding wheels of a vehicle from drive train vibrations
Assignee: Siemens AG
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Filing: 1989-10-10
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Granted: 1991-02-12
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Expires: 2009-10-10
Abstract
Abstract Method and apparatus by which skidding wheels of a vehicle are quickly recognized and distinguished from drive train vibrations. The method uses the difference between values of a comparison parameter (e.g. wheel circumferential distance) of a driven wheel and a similar comparison parameter of a non-driven wheel. The differences are summed over time intervals as soon as a kinetic parameter (e.g. slippage of the driven wheel) exceeds a threshold value. When the sum of the difference values exceeds a maximum value, a control signal is generated that can be used, for example, as an alarm signal for the driver, or as a control signal for changing the drive moment of the wheel, for changing gears, or for driving additional wheels.
Inventors
- 👤 Hans-Georg Kumpfmueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:12
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/173
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
104 words
A method for distinguishing skidding wheels of a vehicle from driven train vibrations comprising the following steps: determining when a kinetic parameter exceeds a threshold value; calculating, in clocked fashion, a set of difference values between a first comparison parameter corresponding to a driven wheel and a second comparison parameter corresponding to a non-driven wheel, when the kinetic parameter is greater than a threshold value; adding the difference values; comparing the sum of the calculated difference values to a predetermined maximum value; and triggering a control signal indicating skidding wheels when the sum of the difference values is greater than said predetermined maximum value.
Claim 2
Independent Claim
104 words
A method for distinguishing skidding wheels of a vehicle from driven train vibrations comprising the following steps: determining when a kinetic parameter exceeds a threshold value; calculating, in clocked fashion, a set of difference values between a first comparison parameter corresponding to a driven wheel and a second comparison parameter corresponding to a non-driven wheel, when the kinetic parameter is greater than a threshold value; adding the difference values; comparing the sum of the calculated difference values to a predetermined maximum value; and triggering a control signal indicating skidding wheels when the sum of the difference values is greater than said predetermined maximum value.
Claim 3
Dependent Claim
47 words
A method according to claim 1, comprising the additional step of setting the sum of the calculated difference values to the value zero when said sum exceeds said predetermined maximum value or when the kinetic parameter derived from the wheel speeds falls below a predetermined minimum value.
Claim 4
Dependent Claim
35 words
A method according to claim 2, comprising the additional steps of deriving said kinetic parameter from the wheel speeds, and choosing said predetermined minimum value such that it is no greater than said threshold value.
Claim 5
Dependent Claim
39 words
A method according to claim 1, comprising the additional step of triggering the control signal only when the sum of the calculated difference values exceeds said predetermined maximum value and said kinetic parameter simultaneously lies above said threshold value.
Claim 6
Dependent Claim
23 words
A method according to claim 1, comprising the additional step of erasing said control signal at a predetermined time after it is triggered.
Claim 7
Dependent Claim
26 words
A method according to claim 1, comprising the additional step of erasing the control signal upon downward transgression of said threshold value by said difference value.
Claim 8
Dependent Claim
20 words
A method according to claim 1, further wherein said comparison parameters comprise the circumferential distance traveled by the respective wheels.
Claim 9
Dependent Claim
16 words
A method according to claim 1, further wherein said comparison parameters comprise the respective wheel speeds.
Claim 10
Dependent Claim
18 words
A method according to claim 1, further wherein said comparison parameters comprise the acceleration of the respective wheels.
Claim 11
Dependent Claim
163 words
A method according to claim 1, further comprising the following steps: providing a first comparator to compare said kinetic parameters to said response threshold value and emit an output signal when the kinetic parameter exceeds the response threshold value; providing a calculating unit to calculate said difference values; providing a memory unit to form the sum of said difference values calculated by said calculating unit in clocked fashion; providing a second comparator to compare the sum to a predetermined maximum value; retaining the sum formation in the memory unit for the duration of the output signal of the first comparator, or up to the beginning of an output signal from the second comparator, and subsequently erasing the sum formed in the memory unit; and setting a flip-flop with the output signal of the second comparator and emitting said control signal from said flip-flop, and resetting said flip-flop when the kinetic parameter falls below said threshold (s1) or after a prescribed duration (signal B).
Claim 12
Independent Claim
114 words
A method of generating a control signal in response to skidding wheels of a vehicle, said method comprising the following steps: sensing a first kinetic parameter in at least one driven wheel of said vehicle; sensing a second, similar kinetic parameter in at least one non-driven wheel of said vehicle; generating difference signals representing the difference between said first and second parameters; sampling the value of said difference signals; summing the value of said difference signals over predetermined time intervals when said difference signals exceed a first predetermined threshold value; and generating a control signal indicating skidding wheels when the value of the sum of said difference signals exceeds a second predetermined threshold value.
Claim 13
Independent Claim
114 words
A method of generating a control signal in response to skidding wheels of a vehicle, said method comprising the following steps: sensing a first kinetic parameter in at least one driven wheel of said vehicle; sensing a second, similar kinetic parameter in at least one non-driven wheel of said vehicle; generating difference signals representing the difference between said first and second parameters; sampling the value of said difference signals; summing the value of said difference signals over predetermined time intervals when said difference signals exceed a first predetermined threshold value; and generating a control signal indicating skidding wheels when the value of the sum of said difference signals exceeds a second predetermined threshold value.
Claim 14
Independent Claim
125 words
An apparatus of generating a control signal in response to skidding wheels of a vehicle, said apparatus comprising the following: means for sensing a first kinetic parameter in at least one driven wheel of said vehicle; means for sensing a second, similar kinetic parameter in at least one non-driven wheel of said vehicle; means for generating difference signals representing the difference between said first and second parameters; means for sampling the value of said difference signals; means for summing the value of said difference signals over predetermined time intervals when said difference signals exceed a first predetermined threshold value; and means for generating a control signal indicating skidding wheels when the value of the sum of said difference signals exceeds a second predetermined threshold value.
Claim 15
Independent Claim
125 words
An apparatus of generating a control signal in response to skidding wheels of a vehicle, said apparatus comprising the following: means for sensing a first kinetic parameter in at least one driven wheel of said vehicle; means for sensing a second, similar kinetic parameter in at least one non-driven wheel of said vehicle; means for generating difference signals representing the difference between said first and second parameters; means for sampling the value of said difference signals; means for summing the value of said difference signals over predetermined time intervals when said difference signals exceed a first predetermined threshold value; and means for generating a control signal indicating skidding wheels when the value of the sum of said difference signals exceeds a second predetermined threshold value.
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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) | 1994-02-11 | 1994-08-13 | 1995-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-11 | 1998-08-13 | 1999-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-11 | 2002-08-13 | 2003-02-12 | $7700.00 | Window Closed / Lapsed |