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Speed control system for a vehicle

  • US 4,843,553 A
  • Filed: 06/21/1988
  • Issued: 06/27/1989
  • Est. Priority Date: 07/16/1987
  • Status: Expired due to Term
First Claim
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1. A speed control system for a vehicle having an internal combustion engine, an output power thereof is adjusted by a throttle valve and is transmitted via a transmission to a driving wheel in order to control a vehicle speed, the control system comprising:

  • target speed determination means for determining a target vehicle speed based on at least a command from a driver of the vehicle;

    first calculation means responsive to an actual vehicle speed and the target vehicle speed for calculating a driving torque at an output side of the transmission necessary to bring the actual vehicle speed to the target vehicle speed utilizing predetermined first parameters, the first parameters being determined based on a first physical model describing the behavior of the vehicle utilizing the vehicle speed as a state variable;

    second calculation means responsive to the driving torque, the target vehicle speed and a gear position of the transmission for calculating a target rotational speed and a load torque of the engine;

    control amount calculation means responsive to the target rotational speed, the load torque, an actual rotational speed of the engine and an intake air pressure of the engine for calculating a control amount of the throttle valve necessary to bring the actual rotational speed of the engine to the target rotational speed utilizing predetermined second parameters, the second parameters being determined based on a second physical model describing the behavior of the engine utilizing said actual rotational speed of the engine and said intake air pressure of the engine as state variables; and

    throttle driving means responsive to the control amount for driving the throttle valve of the internal combustion engine.

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