CHARACTERISATION OF TRANSIENT DIESEL COMBUSTION WITH ADVANCED DIESEL FUELS

Abstract

The design of engine experiments and vehicle running on chassis dynamometer by NEDC - New European Driving Cycle have been conducted for characterising diesel transient combustion behaviour, while the methods were intended to use for discriminating the effect of fuel quality difference on diesel fuels. The thesis deliverables are the proposed engine experiment method and vehicle running on NEDC for differentiating the fuel qualities. For the engine experiment, the suitable method of fuel characterising is load acceleration with constant engine speed by comparing the IMEP-Indicated Mean Effective Pressure, Combustion phase at 50% (CA50) and combustion noise. While, the vehicle running on NEDC could be investigated the combustion during the first loop of ECE, which there is no gear-shift. The detected parameters shall be IMEP, CA50 and injection duration. The information obtained from this study is that for transient diesel combustion, the diffusion phase of combustion is the major key of engine performance instead of both premixed combustion and diffusion combustion in the steady-state running.