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Control system for closed loop mixture correction and split engine operation

  • US 4,256,074 A
  • Filed: 06/07/1979
  • Issued: 03/17/1981
  • Est. Priority Date: 06/16/1978
  • Status: Expired due to Term
First Claim
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1. A control system for an internal combustion engine having first and second cylinder groupings, comprising:

  • split engine control means for operating said engine on full cylinders in which said first and second cylinder groupings are activated to give higher engine power when the magnitude of engine load is above a predetermined value or operating said engine on less than full cylinders in which only said second cylinder grouping is activated to give a lower engine power when the engine load magnitude is below said predetermined value;

    first and second exhaust conduits for passing exhaust gases from said first and second cylinder groupings, respectively, to a common junction;

    a common exhaust conduit connected to said common junction for passing exhaust gases therethrough to the atmosphere;

    a first exhaust gas sensor and a first catalytic converter disposed in said second exhaust conduit;

    a second exhaust gas sensor and a second catalytic converter disposed in said common conduit; and

    feedback control means selectively responsive to a signal from said first exhaust gas sensor when said engine is operated on partial cylinder for correcting the air-fuel ratio of mixture supplied to said second cylinder grouping to a desired value or responsive to a signal from said second exhaust gas sensor when said engine is operated on full cylinders for correcting the air-fuel ratio of mixture supplied to both said first and second cylinder groupings to said desired value.

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