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Method for engine control

  • US 6,067,489 A
  • Filed: 06/04/1997
  • Issued: 05/23/2000
  • Est. Priority Date: 06/04/1997
  • Status: Expired due to Term
First Claim
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1. A method of controlling a vehicle including an internal combustion engine having at least one engine driven multi-speed cooling fan assembly including a fan clutch and an engine driven multi-speed cooling fan that is turned on and turned off based on a current status of a pre-selected set of vehicle operating parameters and that has a low operating speed and a high operating speed, and an electronic control unit with memory for controlling the engine, the method comprising:

  • operating the at least on cooling fan at the high speed;

    sensing the current status of the pre-selected set of vehicle operating parameters;

    determining a desired fan condition for the at least one cooling fan based on the current status, the desired fan condition being turned off;

    thereafter, while the desired fan condition is turned off, operating the at least one engine driven fan at the low speed for a pre-selected period of time; and

    immediately after the pre-selected period of time, turning the at least one cooling fan off.

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