Application of the Miller cycle to reduce NO x emissions from petrol engines

Abstract: A conceptual analysis of the mechanism of the Miller cycle for reducing NO x emissions is presented. Two versions of selected Miller cycle (1 and 2) were designed and realized on a Rover “K” series 16-valve twin-camshaft petrol engine. The test results showed that the application of the Miller cycle could reduce the NO x emissions from the petrol engine. For Miller cycle 1, the least reduction rate of NO x emission was 8% with an engine-power-loss of 1% at the engine’s full-load, compared with that of standard Otto cycle. For Miller cycle 2, the least reduction rate of NO x emission was 46% with an engine-power-loss of 13% at the engine’s full-load, compared with that of standard Otto cycle. [Copyright &y& Elsevier]