Wheel slip control system

• US 4,843,552 A
• Filed: 06/02/1986
• Issued: 06/27/1989
• Est. Priority Date: 06/08/1985
• Status: Expired due to Term

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Inagaki, Takafumi
• Primary Examiner(s): Chin, Gary
• Application Number:
  US06/869,372
• Time in Patent Office: 1,121 Days
• Field of Search: 364/426, 364/565, 364/571, 180/197, 361/238, 303/96, 303/98, 303/100, 303/103, 303/111
• US Class Current: 701/84
• 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 wheel slip control system is provided which includes a drive wheel speed detection device for detecting the speed of drive wheels driven by an internal combustion engine, a follower speed detection device for detecting the speed of follower wheels, a rotation difference computing device for computing the ratio of a detected value of the drive wheel speed detection device to a detected value of the follower speed detection device if the absolute change rate of the detection value of the drive wheel speed detection device is less than a fixed value, a drive wheel speed correction device for correcting a detected value of the drive wheel speed detection device using the wheel speed ratio computed by the rotation difference computing device, a slip determination device for determining if a slip is occurring by comparing the value of drive wheel speed corrected by the drive wheel speed correction device with the detected value of the follower speed detection device and an output power control for controlling the output power of the internal combustion engine according to the determination of the slip determination means.

Claims

1. A wheel slip control system comprising:

a drive wheel speed detection means for detecting a speed of drive wheels;

a follower speed detection means for detecting a speed of non-driven follower wheels;

a rotation difference computing means for computing the ratio of a detected value of said drive wheel speed detection means to a detected value of said follower speed detection means during a steady state running condition;

a drive wheel speed correction means for correcting said detected value of said drive wheel speed detection means using said wheel speed ratio determined by said rotation difference computing means;

a slip determination means for determining if slippage of said drive wheels is occurring by comparing the value of the drive wheel speed corrected by said drive wheel speed correction means with a value based on the detected value of said follower speed detection means; and

an output power control means for improving traction output according to the determination of said slip determination means when the vehicle is in a non-steady state running condition.

2. The wheel slip control system according to claim 1, wherein said slip determination means determines that a vehicle slips if the corrected value of drive wheel speed is greater than the detected value of follower speed, and determines that a vehicle does not slip if the corrected value of drive wheel is less than the detected value of follower speed.

3. The wheel slip control system according to claim 1, wherein said output power control means controls the output power of an internal combustion engine in response to the difference between the corrected value of the drive wheel speed and the detected value of the follower speed.

4. The wheel slip control system according to claim 1, wherein said output power control means controls the amount of intake air.

5. The wheel slip control system according to claim 1, wherein said rotation difference computing means determines that a vehicle drives at constant speed if an absolute value of said detected value of drive wheel speed is less than a fixed value.

6. The wheel slip control system according to claim 1, wherein said rotation difference computing means computes said ratio when an absolute value of the detected value of said drive wheel detection means is less than a fixed value.

7. The wheel slip control system according to claim 1, wherein said output power control means controls output power of an internal combustion engine.

8. A wheel slip control system comprising:

a drive wheel speed detection means for detecting a speed of drive wheels driven by an internal combustion engine;

a follower speed detection means for detecting a speed of non-driven follower wheels;

a rotation difference computing means for computing the ratio of a detected value of said drive wheel speed detection means to a detected value of said follower speed detection means when the absolute value of the detected value of said drive wheel speed detection means is less than a fixed value;

a drive wheel speed correction means for correcting said detected value of said drive wheel speed detection means using said wheel speed ratio determined by said rotation difference computing means;

a slip determination means for determining that slippage of said drive wheels is occurring if the value of the drive wheel speed corrected by said drive wheel speed correction means is different than a value based on the detected value of said follower speed detection means; and

an output power control means for controlling output power of the internal combustion engine according to the determination of said slip determination means.