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Engine temperature control system

  • US 4,489,680 A
  • Filed: 01/23/1984
  • Issued: 12/25/1984
  • Est. Priority Date: 01/23/1984
  • Status: Expired due to Fees
First Claim
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1. An engine temperature control system for maintaining the temperature of coolant, in the engine jacket of an internal combustion engine, within desired narrow limits regardless of external conditions and load on the engine, comprising:

  • a radiator through which the coolant may be circulated from the engine jacket to effect cooling of the coolant;

    a temperature sensor for sensing the temperature of the coolant in the engine jacket;

    means responsive to said temperature sensor for producing a controlled fluid pressure which is a function of and represents the sensed temperature;

    a coolant flow control valve which responds to the fluid pressure, when the sensed coolant temperature is in a relatively low temperature range, to vary the amount of coolant diverted to and flowing through the radiator;

    radiator shutters controlled by the fluid pressure, when the sensed temperature is in a medium temperature range above the low temperature range, for adjusting the amount of ram air impinging on the radiator;

    and a variable speed fan drive responsive to the fluid pressure, when the sensed coolant temperature is in a relatively high temperature range above the medium range, for blowing a controlled amount of air through the radiator.

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