FIELD: engines and pumps.
SUBSTANCE: method includes stages of adjusting the fuel-air ratio of the upstream exhaust gases to maintain the first device (70) of exhaust gases emission reduction at or below the threshold temperature, and when the fuel-air ratio of the upstream exhaust gases is below the threshold value, the air in injected into the exhaust passage (35) between the first device (70) of exhaust gases emission reduction and the second device (72) of exhaust gases emission reduction to maintain the downstream exhaust gases on a different, higher fuel-air ratio. The engine system and method for the engine are disclosed.
EFFECT: providing the possibility of converting exhaust gases in a downstream device of exhaust gases emission reduction without exposing the upstream device of exhaust gases emission reduction to high temperatures.
20 cl, 9 dwg
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