engleski

Improving the trasient response of a turbocharged diesel engine by using electrical assisting systems

It is a well-known fact that turbocharged diesel engine suffer from inadequate response to sudden load increases, which is a consequence of the nature of the energy exchange between the engine and the turbocharger. The dynamic response of turbocharged diesel engine could be improved by the use of electrical assisting systems, either by direct energy supply with an integrated starter-generator mounted on the engine flywheel or indirect energy supply with an electricaly assisted turbocharger. A previously verified zero-dimensional model computer simulation method was used for the analysis of both concepts of electrical assistance. The reliability of presented data is additionaly ensured by the experimentaly determined characteristics of the electric motors used as input parameters for the simulation. The paper offers an analysis of the interaction between the turbocharged diesel engine and the electrical assisting systems as well as the requirements for electric motors that are suitable for the improvement of an engine's dynamic response in a vehicle. The presented results of vehicle dynamics indicate the features and differences of both concepts of electrical assistance.

diesel engines; turbocharging; numerical simulations; dynamic response

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