In recent years, plug-in hybrid vehicles and hybrid vehicles have been developed and popularized against the backdrop of stricter fuel consumption and emission regulations in many countries. Model Based Development (MBD) is becoming increasingly important in the development of such vehicles, and one-dimensional models are often used to calculate transient operation and overall vehicle performance. Cold starting results in poor engine emission performance and catalyst purification performance. Especially for plug-in hybrid vehicles, multiple short-term engine starts may occur even in CD (Charge Depleting) mode, when the vehicle runs as an electric vehicle. In this study, two models are constructed as sub-models of the entire vehicle system, 1. a combustion model that can reproduce cold starting and transient operation, 2. a combustion model that predicts emissions of components such as CO, THC, and NO. The model was fed with time series data of engine speed and engine torque during WLTC driving to predict the number of emissions during WLTC driving. When emissions were compared by changing the initial coolant temperature in anticipation of early engine warm-up, THC and NO emissions were reduced by 33 % and 22 %, respectively, while CO was 37 % worse at coolant temperatures ranging from 20 deg.C to 80 deg.C in the low phase of WLTC.
Abe et al. (Wed,) studied this question.
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