1995-02-01

Mixture Preparation Measurements 950069

A technique was demonstrated that can quantify the state of mixture preparation during the critical periods of ignition and very early flame development in a “production” spark-ignited engine. To determine the degree of stratification and vaporization two fast-response hydrocarbon (HC) probes were placed in a specially adapted spark plug. Data from the HC analyzer was correlated with cylinder pressure data to relate changes in mixture preparation to classic engine measures, such as indicated mean effective pressure (IMEP) and ignition delay.

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