Reciprocating engines equipped with electromagnetic gas admission valves per cylinder have the advantages of an excellent response to load steps, opportunities for per-cylinder process optimization and the absence of ignitable mixture in the intake receiver. The absence of a throttle valve reduces the pumping losses and simplifies the control strategy. If such engines have to be operated at loads below 30% of their rated power, the fuel supply to part of the cylinders can be cut off to improve the fuel consumption and decrease the hydrocarbon emissions. In this paper, the benefits of this so-called skipfiring methodology have been predicted and the results could be confirmed with tests on a 5.5 MW four-stroke gas engine.

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