Model-based tuning is a way followed by car manufacturers to reduce development costs. In this context, a new methodology has been developed in order to adapt a tur-bocharged diesel engine in the case of non-standard external conditions. Indeed, variable geometry turbine and fuel injection command laws are developed for standard conditions (20°C, altitude=0m). Turbocharger and fuel injection actuators pre-positioning maps should be adjusted regarding the inducted air mass density (influenced by the external temperature and pressure), in order to meet thermal, mechanical and pollutant emissions constraints. In order to reduce the use of climatic tests bench and extreme conditions tests in foreign countries, a model of a turbocharged diesel engine coupled to an optimization loop has been used to take into account the effect of non-standard external conditions on pre-positioning maps. This tool is based on ACHILLE, a PC-based simulation system for the internal combustion engines, developed internally at Renault.The paper is structured in three parts: It is concluded that the optimization tool based on a mean-value engine model gives very satisfying results: it requires low CPU charge, while turbocharger and fuel injection actuators pre-positioning maps given by the simulation tool are predictive. Additionally, the treatment of the turbocharger data maps allows good agreement between calculation and experimental results, while providing a good robustness level to the model.


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    Title :

    Physics based diesel turbocharger model for control purposes


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    9th International Conference on Engines and Vehicles ; 2009



    Publication date :

    2009-09-13




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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