Three types of combustion chamber configurations (Types A, B, and C) with compression ratio lower than that of the baseline were tested for improved performance and exhaust gas emissions from an inline-four-cylinder 1.7-liter common-rail diesel engine manufactured for use with passenger cars. First, three combustion chambers were examined numerically using CFD code. Second, engine tests were conducted by using Type B combustion chamber, which is expected to have the best performance and exhaust gas emissions of all. As a result, 80% of NOx emissions at both low and medium loads at 1500 rpm, the engine speed used frequently in the actual city driving, improved with nearly no degradation in smoke emissions and brake thermal efficiency. It was shown that a large amount of cooled EGR enables NOx-free combustion with long ignition delay. In addition, the low compression ratio piston led to 22% improvement on maximum torque at the same engine speed without increasing maximum cylinder pressure.
|ジャーナル||SAE Technical Papers|
|出版ステータス||Published - 2006 1月 1|
|イベント||Powertrain and Fluid Systems Conference and Exhibition - Toronto, ON, Canada|
継続期間: 2006 10月 16 → 2006 10月 19
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