The constant demand regarding vehicle efficiency and emissions improvement is a consequence of the expected very restrict emission regulations in the whole world. Despite the vehicle market being changing due to several new powertrain configurations options, such as hybrid and electric, internal combustion engines will still play an important role in future global vehicle market, due to its applicability in powertrain systems.Among other engine parameters, the geometric compression ratio has an important impact on the engine thermal efficiency and vehicle performance, however such parameter requires deep investigations in order to avoid operation with pre ignition and combustion knocking events.Vehicle simulation is widely used to select powertrain adequately, with respect to fuel consumption and performance. The present work explores the effects of increasing engine geometric compression ratio from 12.5 to 13.9:1, in a naturally aspirated engine with 1.6 l of displacement fueled with E22 (Gasoline with 22% of Ethanol). The investigation was focused on fuel consumption and vehicle performance. The results in steady state presented a potential of reducing fuel consumption in an average of -2.6% over the representative operation points for FTP-75 emissions cycle using geometric compression ratio of 13.9:1.The engine specific fuel consumption maps for E22 were generated based on steady state measurements on engine test bench, and used as input for vehicle simulation. The vehicle model was built and validated considering FTP-75 and HWFET emissions cycles, and as well performance tests that supported the comparison between the vehicle engine with geometric compression ratio of 12.5 and 13.9:1 on chassis dynamometer.


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    Title :

    Vehicle Energy Conversion and Performance Simulation of a High Geometric Compression Ratio Engine


    Additional title:

    Sae Technical Papers



    Conference:

    2020 SAE Brasil Congress & Exhibition ; 2020



    Publication date :

    2021-03-26




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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