Traction control system for vehicle

• US 5,539,643 A
• Filed: 02/01/1993
• Issued: 07/23/1996
• Est. Priority Date: 02/04/1992
• 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, Yamamoto, Osamu, Kiryu, Hironobu, Shiraishi, Shuji
• Primary Examiner(s): Teska, Kevin J.
• Assistant Examiner(s): FREJD, RUSSELL WARREN
• Application Number:
  US08/012,126
• Time in Patent Office: 1,268 Days
• Field of Search: 364/424.05, 364/424.01, 364/426.03, 364/426.01, 364/426.04, 364/431.05, 364/426.02, 180/197
• US Class Current: 701/85
• 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

Abstract

A traction control system for a vehicle includes a calculator for calculating a speed of a driven wheel of the vehicle, a calculator for calculating a vehicle speed and a calculator for calculating a slip rate of the driven wheel on the basis of the driven wheel speed and the vehicle speed, such that the feed-back control of a throttle valve is carried out to reduce the output torque from an engine to inhibit the excessive slipping of the driven wheel, when the slip rate exceeds a predetermined threshold value. The system further includes a calculator for calculating a total grip force of the vehicle, a calculator for calculating an initial engine required torque at the start of the feed-back control of the throttle valve on the basis of the total grip force, and a calculator for calculating an initial throttle opening degree of the throttle valve on the basis of the initial engine required torque. Thus, the excessive slipping of the driven wheels can be reduced without an abrupt change exerted to the behavior of the vehicle by setting an appropriate initial throttle opening degree.

Claims

1. A traction control system for a vehicle, comprising:

driven wheel speed calculating means for calculating a speed of a driven wheel of the vehicle;

a vehicle speed calculating means for calculating a vehicle speed of the vehicle;

a slip rate calculating means for calculating a slip rate of the driven wheel on the basis of said driven wheel speed and said vehicle speed, such that the feed-back control of a throttle valve is carried out to reduce the output torque from an engine to inhibit an excessive slipping of the driven wheel, when said slip rate exceeds a predetermined threshold value;

a total grip force calculating means for calculating a total grip force of the vehicle, wherein said total grip force calculating means calculates said total grip force on the basis of a longitudinal acceleration of the vehicle detected by a longitudinal acceleration detecting means and a lateral acceleration of the vehicle detected by a lateral acceleration detecting means;

an initial engine required torque calculating means for calculating an initial engine required torque on the basis of said total grip force and a reduction ratio at the start of the feed-back control of said throttle valve; and

an initial throttle opening degree calculating means for calculating an initial throttle opening degree of said throttle valve on the basis of said initial engine required torque.

2. A traction control system for a vehicle according to claim 1, wherein the initial engine required torque calculated in said initial engine required torque calculating means includes a travel resistance torque of the vehicle calculated in a travel resistance torque calculating means.

3. A traction control system for a vehicle according to claim 1, wherein an engine torque calculated in an engine torque calculating means is used as said initial engine required torque, when said slip rate is smaller than said predetermined threshold value.