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Combustion Improvement of an HSDI Diesel Engine With Increasing Injection-Pressure and Injection Rate Shaping
Published October 01, 2007 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
Effects of high-injection pressure up to 240 MPa and injection-rate shaping on rating power and its revolution, and on exhaust emissions from an HSDI diesel were investigated using single-cylinder research engine. Fuel-air equivalent ratio (φ) limited by exhaust smoke number is strongly associated with velocity ratio of fuel spray to squish air motion. It is confirmed high injection pressure of 240 MPa realizes φ0.78 at 5000 rpm. Effect of initial injection-rate suppression on exhaust emission decreases as charging efficiency is increased. High injection pressure over 200 MPa is also effective on reduction of NOx and smoke with combination of high-boost pressure and high-EGR ratio.