Wheel slip control system for a vehicle

• US 4,739,856 A
• Filed: 12/01/1986
• Issued: 04/26/1988
• Est. Priority Date: 12/28/1985
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Nakamura, Kazumasa, Inagaki, Takafumi, Yoshikawa, Isao
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/936,498
• Time in Patent Office: 512 Days
• Field of Search: 180/197, 303/103, 364/426, 123/335, 123/334
• US Class Current: 180/197
• CPC Class Codes: B60T 8/175 Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control safety devices for propulsion unit control responsive to, or preventing, skidding of wheels B60K28/16

Abstract

Wheel slip control system of the present invention controls an output of an internal combustion engine during acceleration of a vehicle and controls a hydraulic braking device of a driven wheel during acceleration of the vehicle, determines a value representative of a cumulative time control of the hydraulic braking device is effected and compares the value with a predetermined value, and changes selectively the output control of the internal combustion engine and the control of the hydraulic device in accordance with the comparison to thereby control driven wheel speed within a predetermined range such that a maximum torque is obtained.

Claims

1. A wheel slip control system for a vehicle comprising:

output control means for controlling an output of an internal combustion engine during acceleration of the vehicle,

brake control means for controlling a driven wheel hydraulic braking device during acceleration of the vehicle,

determination means for determining a value representative of a cumulative time that control of said hydraulic braking device is effected and comparing said value with a predetermined value, and

change means responsive to said determination means for changing selectively said output control of said internal combustion engine and said control of said hydraulic braking device in accordance with said comparison to thereby control a driven wheel speed within a predetermined range such that wheel slip is minimized.

2. The wheel slip control system for a vehicle according to claim 1 wherein said change means elects said output control of the internal combustion engine if said value is greater than said predetermined value.

3. The wheel slip control system for a vehicle according to claim 1 wherein said change means elects said control of said hydraulic braking device if said value is less than said predetermined value.

4. The wheel slip control system for a vehicle according to claim 1 wherein, said output control of the internal combustion engine is operable to adjust a throttle valve.

5. The wheel slip control system for a vehicle according to claim 1 wherein, said output control of the internal combustion engine is operable to adjust an ignition timing.

6. The wheel slip control system for a vehicle according to claim 1 wherein, said hydraulic braking device includes a master cylinder connected to brake means and a sub master cylinder.

7. The wheel slip control system for a vehicle according to claim 1 wherein, said value is updated upon every generation of said acceleration slip.

8. The wheel slip control system for a vehicle according to claim 1 wherein, said value is reset when said driven wheel speed falls in said predetermined range.