Development of Natural Gas Demonstrator Based on an Urban Vehicle with a Down-Sized Turbocharged Engine

Abstract : The main objective of this project is to confirm the high efficiency of compressed natural gas (CNG) fuel when used in urban conditions. For this purpose, a demonstrator vehicle using only CNG fuel has been developed when modifying an existing gasoline urban vehicle. The target is to achieve low CO2 emissions with a maximum level of 100 g/km on the motor vehicles emissions group (MVEG) driving cycle, while keeping pollutant emissions below Euro IV level. In addition, partners involved focus to maintain vehicle behaviours as maximum vehicle speed and acceleration close to standard gasoline version. For these reasons, a Smart car has been chosen offering, on one hand, a small displacement engine useful to obtain low CO2 emissions (downsizing approach), and on another hand, turbocharger characteristic necessary to maintain torque and power outputs in accordance with expectation. The first step was dedicated to CNG specific engine parts design (pistons, connecting rod, crankshaft, camshaft, etc.) in order to optimise CNG configuration. During the following steps, the engine has been optimised on a test bench. Valve timing and turbocharger selection have been optimised in order to obtain the best trade-off in terms of power consumption and pollutants. The final step has been to calibrate the engine, firstly on the test bench and secondly on the vehicle. This work allows coping with Euro IV emissions level with optimised catalyst light-off, transient running conditions, drive-ability, etc.
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R. Tilagone, S. Venturi. Development of Natural Gas Demonstrator Based on an Urban Vehicle with a Down-Sized Turbocharged Engine. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2004, 59 (6), pp.581-591. ⟨10.2516/ogst:2004042⟩. ⟨hal-02017337⟩

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