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首页> 外文会议>SAE Conference >A major origin of cyclic energy conversion variations in SI engines: cycle-by-cycle variations of the equivalence ratio and residual gas of the initial charge
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A major origin of cyclic energy conversion variations in SI engines: cycle-by-cycle variations of the equivalence ratio and residual gas of the initial charge

机译：Si发动机的循环能量转换变化的主要起源：逐个循环变化的等效比和初始电荷的残留气体

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It is demonstrated that the cycle-by-cycle variations in the IMEP of a realistic automobile engine with port fuel injection are dominated by the cyclic fluctuations of the equivalence ratio and residual gas content of the initial charge at least for certain operating conditions. A new spontaneous Raman scattering technique yields simultaneously the densities of fuel, O_2, N_2 and H_2O prior to ignition. In-cylinder equivalence ratio and residual gas content are determined quantitatively with high precision by ratios of densities. Prior-cycle effects are observed and explained by the properties of the initial charge. The results show that cyclic variability can be explained and may be consequently reduced by the help of the new measurement system.
机译：结果证明，具有端口燃料喷射的现实汽车发动机的IMEP中的逐周期变化由初始电荷的等效比和初始电荷的残留气体含量的循环波动主导。一种新的自发拉曼散射技术同时产生燃料，O_2，N_2和H_2O在点火之前的密度。通过密度的比例，定量高精度测定缸内等效率和残留气体含量。通过初始电荷的性质观察和解释先前循环效应。结果表明，可以通过新测量系统的帮助解释，可以解释循环变异性，并且可以减少。

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