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The Dependence of Diesel Combustion on Injection Rate
Published January 01, 1998 by Institution of Mechanical Engineers in United Kingdom
Over the last decade, passenger car engines have been developed to reduce the effects of their exhaust emissions upon the environment locally, both in the immediate vicinity and aggregated over large conurbations. This trend seems set to continue and the exhaust emissions will have to be reduced further to meet stringent limits in Euro IV. In addition, increasing concern over potential climate changes caused by excessive release of carbon dioxide, methane, etc., into the upper atmosphere is driving a reassessment of the efficiency of automotive engines. Compression ignition engines are the front runners among efficient, automotive power plant options and advanced development programs are aimed at increasing the thermal efficiency of practical engines to over 50%. Appropriate control of injection rate has been shown to reduce gaseous emissions and there are injection rate requirements to minimize soot generation.
This paper starts with a brief description of the terminology and the injection rate measurement technique used for the results presented. Later sections describe, and illustrate with experimental data, the influence of injection rate on the noise, unburned hydrocarbon emissions, nitric oxide and soot generation in high-speed, direct-injection diesel engines.