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In this paper the effect of the engine load and the EGR (exhaust gas recirculation) rate on the combustion process and the pollutant emissions when using RME (rapeseed methyl-ester) is investigated. For this purpose a parametric study in a single-cylinder HSDI (high speed direct injection) engine in a wide range of operating conditions (thus trying to maximize the generality of the results) has been carried out. All the output parameters are compared with the corresponding ones for a reference diesel fuel at equivalent engine performances and operating conditions. To perform a rigorous comparison, a specific methodology has been designed based on the comparison at equivalent engine load and oxygen mass fraction in the intake manifold, so as to remove the effect of the fuel properties (derived from the different oxygen content, mainly) on the engine performances.

This paper presents a study and review of the data collected in an Engine Fault Diagnosis System using oil analysis, used for diagnose different industrial vehicle engines (trucks, buses, road construction equipment, etc.). This system is being used since the beginning of the 1990s decade. The information acquired in this system has generated an important database that collects the information about the oil status at drain moment and further collateral information. Knowledge about oil properties (viscosity, TBN, detergency), and oil contamination, (insolubles content, soot from combustion, fuel dilution, and water) during engine operation, provide an important information about lubricants efficiency, optimal drain period and engine status that it has a direct influence on vehicles running cost. The study has been performed with a statistical tool which allows the characterisation of the main parameters of oil behaviour, in addition to the relationship between them.