Abstract
A high-accuracy knocking prediction model with low computation loads is necessary for the efficient development of SI engines using engine performance simulators. In the first report, the scientific nature of autoignition prediction using the Livengood-Wu integral was investigated. In the second report, ignition delay time equations for a premium-gasoline surrogate fuel were developed, which can reproduce the temperature-, pressure-, and equivalence ratio-dependences of ignition delay time produced using a detailed reaction mechanism. In the third report, error factors in in-cylinder autoignition prediction using the Livengood-Wu integral with the ignition delay time equations were investigated. In the fourth report, an error correction equation was developed, which can cancel the errors of timing predicted using the Livengood-Wu integral from ignition timing. An autoignition prediction model using “reverse Livengood-Wu integral” with the ignition delay time and error correction equations was proposed. In the present report, the ignition delay time equations have been improved to reproduce the EGR-dependence of ignition delay time.
