FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: proposed method of exhaust gas toxicity reduction comes to preparation of hydrocarbon fuel mixture with air excess coefficient greater than unity and delivering the mixture into combustion chamber cleaned from gas remnants by ejection of exhaust gases of other cylinder operating at exhaust stroke, igniting mixture by spark initiated with advance and delivering a catalyst in form of iron or copper into combustion chamber to neutralize process of nitrogen oxide formation. EFFECT: improved cleaning of exhaust gases, reduced temperature of engine and exhaust system, increased mechanical efficiency of internal combustion engine. 4 dwg
