Reduction of greenhouse gas emissions is a major concern of today's worldwide automotive industry. In the short-term, by far the most cost-effective strategy to reduce emissions and fuel consumption is the optimization of efficiency. In the near future, the generalization of hybrid vehicles will certainly be a reality, because it can reduce fuel consumption and greenhouse gas emissions up to 40% with no change in vehicle class and hence no compromise on safety or performance. Using CNG (Compressed Natural Gas) as a fuel allows an even more drastic reduction of CO2 emissions (23% saving with regard to the gasoline reference), contributes to energy supply diversification and reduces Europe's dependency on crude oil. This paper gives an overview of the potential of energy consumption reduction by the combination of a dedicated CNG internal combustion engine with an electric motor in a hybrid vehicle (Toyota Prius II, fuelled by CNG only). The objective of the project was to bring CO2 emissions down below the threshold level of 80 g/km on the NEDC(New European Emission Drive Cycle) and to ensure that regulated pollutant emissions comply with Euro 4 regulation. The main optimizations focused on the thermal engine mapping dedicated to CNG combustion and the integration both ofthe HP CNG line and the electronic control unit. A second project vehicle aimed to develop a mild-hybrid CNG urban vehicle based on a MCC Smart car equipped with the reversible starter-alternator StARS (Starter Alternator Reversible System) and ultra-capacitors as stocker. Alongside optimizations of the engine (increased compression ratio, dedicated mapping) and the vehicle (tanks implementation, vehicle management system), challenging works were carried out to develop control system both for engine and AMT(Automatic Manual Transmission. We present in the paper the technical solutions adopted for the realization of the two demonstrators. The results in terms of fuel consumption and pollutant emissions after optimization are also highlighted.This paper has presented an overview of the work done to develop a dedicated downsized turbo-charged CNG engine equipped with a starter-alternator with power assist and energy recuperation capabilities and its integrated powertrain control system. The next developments i concern appropriate strategies for on-board energy management to be integrated with the vehicle manager. Then, an AST (Automatic Shift ) layer performing gearshifts to optimize global efficiency of the hybrid engine-motor system will be tested. Alongside these main targets, efforts will focus the developed system robustness in case of sensor failure. Final works will concern the validation chassis-dyno tests to measure the pollutants emissions and fuel consumption performances.


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    Titel :

    Environnemental performances evaluation of natural gas hybrid demonstrators based on two commercial vehicles : a Toyota Prius II and a Smart Fortwo


    Weitere Titelangaben:

    Bewertung der Umweltfreundlichkeit am Beispiel von zwei kommerziell vertriebenen Naturgas-Hybrid-Kraftfahrzeugen: einem Toyota Prius II und einem Smart Fortwo


    Beteiligte:


    Erscheinungsdatum :

    2007


    Format / Umfang :

    24 Seiten, 29 Bilder, 3 Tabellen, 20 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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