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Apparatus for controlling vehicle drive force depending upon vehicle load determined by engine load and vehicle speed

  • US 5,517,410 A
  • Filed: 06/27/1994
  • Issued: 05/14/1996
  • Est. Priority Date: 07/08/1993
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling an automatic transmission of a motor vehicle having an engine and a drive wheel driven by a drive force based on an output of the engine, said apparatus comprising a transmission controller for shifting said automatic transmission so as to change a speed ratio of said transmission, on the basis of a load acting on the engine and a running speed of the vehicle and according to a predetermined shift boundary line, said transmission controller comprising:

  • relationship setting means for setting a standard relationship between said load acting on said engine and said running speed of the vehicle when the vehicle is running in a stable mode at a relatively constant speed on a generally flat road surface;

    vehicle-load determining means for determining a running load acting on the vehicle as represented by said load acting on said engine and said running speed, on the basis of said standard relationship set by said relationship setting means;

    said vehicle-load determining means including means for determining a standard loaded-vehicle speed on the basis of the load acting on the engine and according to said standard relationship, and means for calculating a vehicle load coefficient as said running load, on the basis of said standard loaded-vehicle speed and the detected running speed of the vehicle; and

    drive force control means for adjusting said predetermined shift boundary line on the basis of said vehicle load coefficient, to chance said speed ratio of said automatic transmission for controlling said drive force of said drive wheel.

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