Traction control system for controlling slip in a driving wheel of a vehicle

• US 5,085,288 A
• Filed: 01/10/1990
• Issued: 02/04/1992
• Est. Priority Date: 04/17/1987
• Status: Expired due to Term

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Nishihara, Takashi, Kiryu, Hironobu, Shiraishi, Shuji, Omomo, Naoki
• Primary Examiner(s): Marmor, Charles A.
• Assistant Examiner(s): Johnson, Victor E.
• Application Number:
  US07/463,202
• Time in Patent Office: 755 Days
• Field of Search: 180/197, 180/240, 180/249, 364/426.02
• US Class Current: 180/197
• CPC Class Codes: B60G 17/0165 to an external condition, e.g. rough road surface, side wind
• CPC Class Codes: B60K 28/16 responsive to, or preventing, skidding of wheels brake control systems for vehicle drive stability B60T8/1755; arrangements responsive to a speed condition for adjusting wheel braking force B60T8/32; control of vehicle driving stability otherwise than by controlling the propulsion unit only B60W30/02; preventing wheel slippage by reducing power in rail vehicles B61C15/00
• CPC Class Codes: F02D 2200/702 Road conditions

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.

Claims

1. 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.

2. 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.