Reference value correcting device in driven wheel slip control system

• US 5,749,062 A
• Filed: 12/13/1995
• Issued: 05/05/1998
• Est. Priority Date: 12/20/1994
• 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: Yamamoto, Osamu, Yano, Osamu, Shiraishi, Shuji
• Primary Examiner(s): ZANELLI, MICHAEL J
• Application Number:
  US08/571,799
• Time in Patent Office: 874 Days
• Field of Search: 364/426.016, 364/426.018, 364/426.019, 364/426.027, 364/426.036, 180/197, 303/139, 303/165
• US Class Current: 701/72
• 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: B60T 8/172 Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters B60T8/17551 takes precedence

Abstract

A reference value for a traction control is calculated based on a vehicle speed. When a vehicle is in a predetermined turning state, so that a driven wheel speed is equal to or lower than a predetermined value and a lateral acceleration is equal to or larger than a predetermined value, a correction value is searched from a table based on the vehicle speed and a steering angle to correct an error of the reference value generated due to a difference between the locus of the driven wheels and the locus of the follower wheels during turning of the vehicle. The reference value is corrected by subtracting the correction value from the reference value (when the vehicle is a rear wheel drive vehicle) or by adding the correction value to the reference value (when the vehicle is a front wheel drive vehicle. Thus, the reference value for the fraction control such as a reference value for a target slip rate can be accurately in accordance with the turning state of the vehicle.

Claims

1. A reference value correcting device in a driven wheel slip control system for estimating a slip state of a driven wheel to control a driving torque by calculating a slip rate of the driven wheel, based on a driven wheel speed and a vehicle speed, and by comparing said slip rate with a slip-controlling reference value, said reference value correcting device comprising:

a reference value calculating means for calculating the slip-controlling reference value based on said vehicle speed;

a turning-state detecting means for detecting that the vehicle is in a predetermined turning state;

a correction value calculating means for calculating a correction value which corrects the slip-controlling reference value based on the vehicle speed and a steered state, when the vehicle is in the predetermined turning state; and

a reference value correcting means for correcting said slip-controlling reference value by said correction value.

2. A reference value correcting device in a driven wheel slip control system according to claim 1, wherein said turning-state detecting means determines that the vehicle is in the predetermined turning state, when a wheel speed is equal to or lower than a predetermined value and a lateral acceleration of the vehicle is equal to or lower than a predetermined value.

3. A reference value correcting device in a driven wheel slip control system according to claim 1 or 2, wherein said vehicle is a rear wheel drive vehicle, and said reference value correcting means subtracts said correction value from said slip-controlling reference value.

4. A reference value correcting device in a driven wheel slip control system according to claim 1 or 2, wherein said vehicle is a front wheel drive vehicle, and said reference value correcting means adds said correction value to said slip controlling reference value.