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Vehicle speed control system

  • US 6,104,976 A
  • Filed: 08/31/1998
  • Issued: 08/15/2000
  • Est. Priority Date: 09/01/1997
  • Status: Expired due to Fees
First Claim
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1. A vehicle speed control system comprising:

  • a speed setting section for setting a command vehicle speed;

    a vehicle speed sensing section for sensing an actual vehicle speed;

    a driving force calculating section for calculating a command driving force required to make the actual vehicle speed equal to the command vehicle speed;

    an engine output calculating section for calculating a command engine output in accordance with the command driving force and the command vehicle speed;

    a discriminating section for examining the command driving force to determine whether the command driving force is negative;

    a command engine speed calculating section for storing a predetermined engine torque-versus-engine-speed characteristic relationship in an engine constraint state in which a throttle is fully closed and fuel cutoff is inhibited and for calculating a command engine speed corresponding to the command engine output, from the predetermined engine torque-versus-engine-speed characteristic relationship in the engine constraint state when the command driving force is negative;

    a transmission ratio calculating section for calculating a command transmission ratio in accordance with the command engine speed;

    an engine controlling section for putting an engine in the engine constraint state when the command driving force is negative; and

    a transmission controlling section for controlling a continuously variable transmission in response to the command transmission ratio when the command driving force is negative.

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