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Apparatus for controlling rotational speed of radiator fan

  • US 4,651,922 A
  • Filed: 04/25/1986
  • Issued: 03/24/1987
  • Est. Priority Date: 05/15/1985
  • Status: Expired due to Fees
First Claim
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1. A system for cooling an radiator in an internal combustion engine, comprising:

  • rotating means for generating a flow of air in contact with the radiator for cooling an engine coolant medium in the radiator;

    electric driving means for driving said rotating means;

    sensor means for issuing electric signals representing various cooling requirements of the engine;

    first switch means, responsive to said electric signals indicating an engine cooling requirement which is larger than a predetermined value, for operating said electric driving means in order to obtain a weak cooling by the rotating means;

    second switch means, responsive to said electric signals indicating an engine cooling requirement which is larger than a predetermined value, for operating said electric driving means in order to obtain a much stronger cooling by the rotating means; and

    ,timer means for detecting a predetermined short period after the start of the engine for preventing the operation of the second switch means irrespective of said large cooling requirement.

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