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Ignition apparatus

  • US 4,046,126 A
  • Filed: 12/04/1975
  • Issued: 09/06/1977
  • Est. Priority Date: 12/04/1974
  • Status: Expired due to Term
First Claim
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1. Ignition apparatus for use in a multi cylinder internal combustion engine having a first group of cylinders, means for supplying at least one cylinder of said first group of cylinders with an enriched air-fuel mixture relative to stoichiometric air-fuel ratio, a second group of cylinders, and means for supplying at least one cylinder of said second group of cylinders with a lean air-fuel mixture relative to stoichiometric air-fuel ratio, said ignition apparatus comprising ignition timing control means responsive to the rpm of the said engine for retarding the ignition timing of said second group of cylinders relative to the ignition timing of said first group of cylinders when the engine is operated at low and medium loads and for advancing the ignition timing of said second group of cylinders relative to the ignition timing of said first group of cylinders when said engine is operated at heavy loads.

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