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Intake-air amount detecting system for an internal combustion engine

  • US 3,975,951 A
  • Filed: 03/20/1975
  • Issued: 08/24/1976
  • Est. Priority Date: 03/21/1974
  • Status: Expired due to Term
First Claim
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1. An intake-air amount detecting system for an internal combustion engine comprising;

  • a first temperature detecting means arranged in an air-intake path of an internal combustion engine for detecting the temperature of the intake-air to said engine;

    an electrical heating means arranged in said intake path for heating said intake-air;

    a second temperature detecting means arranged in said intake path for detecting the temperature of the intake-air having been heated by said electrical heating means;

    tubular path means including a heat insulating material arranged to cover said first and second temperature detecting means and said electrical heating means;

    a heat amount control means connected to said first and second temperature detecting means and said electrical heating means for controlling the amount of heat generated by said electrical heating means so as to continuously maintain a constant difference between the temperature of the heated intake-air and the non-heated intake-air; and

    an operational circuit means for calculating the amount of heat generated by said electrical heating means to determine the amount of intake-air to said engine.

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