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Automotive traction control system

  • US 5,241,478 A
  • Filed: 02/20/1992
  • Issued: 08/31/1993
  • Est. Priority Date: 02/20/1991
  • Status: Expired due to Term
First Claim
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1. An automotive traction control system comprising:

  • driving wheel speed detecting means for detecting the speed of a driving wheel;

    free wheel speed detecting means for detecting the speed of a free wheel;

    slip level detecting means for detecting the slip level of the vehicle on the basis of the speed of the driving wheel and the speed of the free wheel;

    standard ignition angle calculating means for calculating a standard ignition time according to engine speed;

    ignition delay angle calculating means for calculating an ignition delay angle for ignition timing on the basis of at least the engine speed and the slip of the vehicle;

    traction control mode ignition angle calculating means for calculating a traction control mode ignition angle for controlling traction on the basis of the standard ignition angle and the ignition delay angle; and

    ignition control means for selecting the traction control mode ignition angle instead of the standard ignition angle when the slip level of the vehicle exceeds a predetermined criterional level;

    the improvement comprising;

    failure detecting means for detecting the failure of the traction control ignition angle calculating means;

    ignition delay angle increasing means for gradually increasing the ignition delay angle calculated by the ignition delay angle calculating means to further delay the ignition timing when the failure detecting means detects the failure of the traction control mode ignition angle calculating means while the ignition timing is controlled according to the traction control mode ignition angle; and

    failure control mode ignition angle calculating means for calculating a failure control mode ignition angle on the basis of the increased ignition delay angle provided by the ignition delay angle increasing means;

    wherein the ignition control means selects the failure control mode ignition angle when the failure detecting means detects the failure of the traction control mode ignition angle calculating means.

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