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Engine air intake control system

  • US 4,237,838 A
  • Filed: 01/04/1979
  • Issued: 12/09/1980
  • Est. Priority Date: 01/19/1978
  • Status: Expired due to Term
First Claim
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1. In an engine system having throttle means for controlling the amount of air flowing into an engine, an air passage bypassing the throttle means, air control valve means within said bypassing air passage for controlling the flow of air bypassing the throttle means, and fuel supply means for supplying said engine with fuel in accordance with the whole amount of air flowing into said engine through both the throttle means and the bypassing air passage, an apparatus for controlling air flowing into said engine comprising:

  • temperature detecting means for detecting the temperature of said engine;

    speed detecting means for detecting the rotation speed of said engine and generating a rotation speed signal proportional thereto;

    reference generating means for generating a reference speed signal representative of a desired idling rotation speed of said engine in response to said temperature detected by said temperature detecting means;

    comparing means for comparing said rotation speed signal generated by said speed detecting means with said reference speed signal generated by said reference generating means and providing a comparator signal for controlling said control valve means thereby controlling the amount of air bypassing the throttle means so as to cause the idling rotation speed to be kept at the desired idling rotation speed;

    throttle detecting means for detecting the closing and opening of said throttle means;

    first control means responsive to said throttle detecting means for allowing and preventing the operation of said air control valve means by said comparing means;

    pressure detecting means for detecting the intake pressure present downstream of said throttle means; and

    second control means for causing said air control valve means to increase and decrease the amount of bypass air in response to the output of said pressure detecting means indicative of said intake pressure being below and above a predetermined value, respectively, said second control means providing a control of said air control valve overriding the control provided by said first control means.

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