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Control apparatus for internal combustion engines

  • US 4,887,574 A
  • Filed: 04/20/1988
  • Issued: 12/19/1989
  • Est. Priority Date: 04/21/1987
  • Status: Expired
First Claim
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1. A lean-burn control apparatus, having a digital arithmetic unit to which signals are inputted from a plurality of detectors for detecting an operational state of an internal combustion engine and an air fuel ratio detector, and controlling a fuel air ratio and ignition timing according to output signals from said arithmetic unit, characterized bymisfire detecting means for detecting a misfiring state of said engine;

  • means for detecting NOx concentration information of said engine; and

    means for controlling said fuel air ratio and said ignition timing so as to fall within a tolerable stable combustion range which is defined based on signals from misfire detector and said NOx concentration information detector, and in which combustion is stable and produces NOx of a tolerable concentration.

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