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Traction control apparatus

  • US 4,985,838 A
  • Filed: 04/18/1989
  • Issued: 01/15/1991
  • Est. Priority Date: 04/20/1988
  • Status: Expired due to Term
First Claim
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1. A traction control apparatus comprising:

  • driving wheel velocity detecting means for detecting a driving wheel of the vehicle;

    driven wheel velocity detecting means for detecting a driven wheel velocity of the vehicle;

    reference velocity setting means for setting a reference velocity on the basis of an output from said driven wheel velocity detecting means;

    slip value detecting means for detecting a slip value of the driving wheel on the basis of a difference between the driving wheel velocity and the reference velocity;

    control start instruction means for outputting at least an engine control start signal when a slip state of the driving wheel including at least the slip value satisfies a predetermined control start condition;

    vehicle acceleration calculating means for calculating a vehicle acceleration of the vehicle on the basis of the output from said driven wheel velocity detecting means;

    reference drive torque calculating means for calculating a reference drive torque on the basis of an output from said vehicle acceleration calculating means;

    target output torque setting means for determining a target output torque of the engine in accordance with an output from said reference drive torque calculating means;

    correction torque setting means for setting a correction torque on the basis of an output from said slip value detecting means, comprising proportional correction torque calculating means for calculating a proportional correction torque proportional to the slip value and integral correction torque calculating means for calculating an integral correction torque on the basis of an integral value of the slip value;

    target output torque correcting means for correcting the target output torque in accordance with an output from said correction torque setting means;

    drive torque control means for, when the engine control start signal is output, controlling an engine output of the vehicle in accordance with the corrected target output torque to control the drive torque of the driving wheel; and

    shift change operation detecting means for detecting a shift change of a transmission of the vehicle, wherein when said shift change operation detecting means detects the shift change operation, said integral correction torque calculating means integrates the slip value to get an integral result while excluding a period of the shift change operation from an integral period of the slip value so as to calculate the integral correction torque in accordance with the integral result.

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