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Vehicle traction control system

  • US 4,721,176 A
  • Filed: 11/28/1986
  • Issued: 01/26/1988
  • Est. Priority Date: 06/13/1986
  • Status: Expired due to Term
First Claim
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1. A traction control system for a vehicle having an internal combustion engine with combustion chambers into which an air and fuel mixture is drawn and ignited to undergo combustion, a wheel driven by the engine and a non-driven wheel, the driven wheel being liable to slipping in the event excessive torque is applied thereto by the engine, the system comprising, in combination:

  • air flow control means including a throttle valve for regulating mass air flow into the engine in response to a vehicle operator air flow command;

    means for determining driven wheel slip that is a function of the difference between the driven and undriven wheel speeds; and

    means responsive to predetermined excessive values of the determined driven wheel slip for (A) adjusting the air flow control means to reduce, after an air flow control delay, the mass air flow into the engine to reduce the torque applied to the driven wheel after the air flow control delay and (B) adjusting a predetermined engine parameter to produce a substantially instantaneous reduction in the torque applied to the driven wheel for a predetermined time period substantially equal to the air flow control delay to provide a reduction in torque applied to the driven wheel by the engine during the air flow control delay.

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