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US5085288A
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Traction control system for controlling slip in a driving wheel of a vehicle
Assignee: Honda Motor Co Ltd
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Filing: 1990-01-10
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Granted: 1992-02-04
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Expires: 2010-01-10
Abstract
Abstract A device for detecting a bad or bumpy road from a moving vehicle includes a plurality of wheel speed detectors for detecting the corresponding wheel speeds of a plurality of different wheels, an arithmetic circuit for calculating a difference between values detected in the individual wheel speed detectors, a filter, receiving outputs from the arithmetic circuit, for processing only components in a predetermined frequency band, and a determination circuit for determining if a vehicle is travelling on a bad road based on outputs from the filter. The device easily detects a bad road from a moving vehicle on the basis of outputs from said wheel speed detectors, without being affected by instantaneous variation in the wheel speeds.
Inventors
- 👤 Shuji Shiraishi
- 👤 Takashi Nishihara
- 👤 Hironobu Kiryu
- 👤 Naoki Omomo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:07
CPC Classifications
B; B60; B60K; B60K28/00; B60K28/10; B60K28/16; B60G; B60G17/00; B60G17/015; B60G17/016; B60G17/0165; F; F02; F02D; F02D2200/00; F02D2200/70; F02D2200/702
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
A traction control system for controlling slip in a driving wheel of a vehicle by reducing a torque of the driving wheel based on a reference slip value, comprising: a bumpy road detector means for detecting a bumpy road; a reference slip value change-over means for changing said reference slip value in response to a condition of a road surface detected by said bumpy road detector means; and wherein said bumpy road detector means includes: a plurality of wheel speed detectors for detecting corresponding wheel speeds at a plurality of wheels of the vehicle; an arithmetic circuit for calculating a difference between the wheel speeds detected by the individual wheel speed detectors; a filter receiving an output from said arithmetic circuit and passing components in a predetermined frequency band to an output; and a determination circuit means, receiving said filter output, for determining if the vehicle is traveling on a bad or bumpy road, in response to the filter output, and outputting a signal indicative thereof.
Claim 2
Dependent Claim
166 words
A traction control system for controlling slip in a driving wheel of a vehicle by reducing a torque of the driving wheel based on a reference slip value, comprising: a bumpy road detector means for detecting a bumpy road; a reference slip value change-over means for changing said reference slip value in response to a condition of a road surface detected by said bumpy road detector means; and wherein said bumpy road detector means includes: a plurality of wheel speed detectors for detecting corresponding wheel speeds at a plurality of wheels of the vehicle; an arithmetic circuit for calculating a difference between the wheel speeds detected by the individual wheel speed detectors; a filter receiving an output from said arithmetic circuit and passing components in a predetermined frequency band to an output; and a determination circuit means, receiving said filter output, for determining if the vehicle is traveling on a bad or bumpy road, in response to the filter output, and outputting a signal indicative thereof.
Claim 3
Dependent Claim
177 words
A traction control system for controlling slip in a driving wheel of a vehicle by reducing a torque of the driving wheel based on a reference slip value, comprising: a bumpy road detector means for detecting a bumpy road; a torque-reduction amount change-over means for changing an amount of torque-reduction in response to a condition of a road surface detected by said bumpy road detector means when said driving wheel is detected to be in a slipping condition; and wherein said bumpy road detector means includes: a plurality of wheel speed detectors for detecting corresponding wheel speeds of a plurality of wheels of the vehicle; an arithmetic circuit for calculating a difference between the wheel speeds detected by the individual wheel speed detectors; a filter receiving an output from said arithmetic circuit and passing components in a predetermined frequency band to an output; and a determination circuit means, receiving said filter output, for determining if the vehicle is traveling on a bad or bumpy road, in response to the filter output, and outputting a signal indicative thereof.
Claim 4
Dependent Claim
177 words
A traction control system for controlling slip in a driving wheel of a vehicle by reducing a torque of the driving wheel based on a reference slip value, comprising: a bumpy road detector means for detecting a bumpy road; a torque-reduction amount change-over means for changing an amount of torque-reduction in response to a condition of a road surface detected by said bumpy road detector means when said driving wheel is detected to be in a slipping condition; and wherein said bumpy road detector means includes: a plurality of wheel speed detectors for detecting corresponding wheel speeds of a plurality of wheels of the vehicle; an arithmetic circuit for calculating a difference between the wheel speeds detected by the individual wheel speed detectors; a filter receiving an output from said arithmetic circuit and passing components in a predetermined frequency band to an output; and a determination circuit means, receiving said filter output, for determining if the vehicle is traveling on a bad or bumpy road, in response to the filter output, and outputting a signal indicative thereof.
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) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |