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Vehicle speed control system and method

  • US 6,178,371 B1
  • Filed: 04/12/1999
  • Issued: 01/23/2001
  • Est. Priority Date: 04/12/1999
  • Status: Active Grant
First Claim
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1. A method for controlling an actual vehicle speed of a vehicle to a desired vehicle speed, the vehicle having an engine with operating parameters that influence an engine torque, the method comprising the steps of:

  • calculating a desired engine torque that would cause the actual vehicle speed to approach the desired vehicle speed determining a required airflow that would generate said desired engine torque;

    determining a minimum allowable airflow which would allow adjustment of the operating parameters to adjust the engine torque without adversely affecting engine performance;

    controlling airflow to said required airflow when said required airflow is greater than said minimum airflow, thereby providing said desired engine torque; and

    controlling airflow to said minimum airflow and adjusting the operating parameters to provide said desired engine torque when said required airflow is less than said minimum airflow.

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