Ignition apparatus
First Claim
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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Accused Products
Abstract
An ignition apparatus is disclosed for use in a multi cylinder internal combustion engine having a first group of cylinders supplied with an enriched air-fuel mixture and a second group of cylinders supplied with a lean air-fuel mixture. A first control device controls the ignition timing of the first cylinders and a second control device controls the ignition timing of the second cylinders. The first and second control devices are adapted to operate in such a way that the ignition timing for the second cylinders is retarded relative to that for the first cylinders at medium or low load conditions of the engine, and the ignition timing for the second cylinders is advanced relative to or nearly the same as that for the first cylinders under a high load condition.
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Citations
6 Claims
- 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.
Specification