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Study of DME diesel engines was conducted to improve fuel consumption and emissions of its. Additionally, DME trucks were built for the promotion and the road tests of these trucks were executed on EFV21 project. In this paper, results of diesel engine tests and DME truck driving tests are presented. As for DME diesel engines, the performance of a DME turbocharged diesel engine with LPL-EGR was evaluated and the influence of the compression ratio was also explored. As for DME trucks, a 100,000km road test was conducted on a DME light duty truck. After the road test, the engine was disassembled for investigation. Furthermore, two DME medium duty trucks have been developed and are now the undergoing practical road testing in each area of two transportation companies in Japan.

The objective of the Combustion Analysis Working Group (WG) in JCAP is prescribed to analyze tail gas emission data obtained by the JCAP Diesel and Gasoline WGs, and to technically explain the origin of the difference in emission levels in terms of the engine, after-treatment, and fuel technologies applied in the measurements. Toward this end, the group firstly constructed the methodology necessary for providing the final outputs, and is carrying out systematical studies such as single-cylinder diesel engine experiments, contractual basis studies on diesel combustion mechanisms. Surveys on the mechanism and performance of after-treatments and the fuel effects on them are also being carried out. This report presents an overview of the methodologies, plans, and some results of the studies.