Experimental Investigation of Thermal Load in High Speed Direct Injection Diesel Engine Under the Control of Various Engine Performance Parameters

Abstract

Multiple injection strategies are being widely utilized to reduce the vibration, noise, and particle emission in diesel engines. A considerable amount of research related to attempts to increase the maximum power and to reduce vibration, noise, and particulate matters has been done. However, investigations of various performance parameters in terms of the thermal load in high speed direct injection engines are rarely to be found despite the fact that the relationship between these parameters and the reliability of the engine is important for mass production. Hence, the thermal load imposed on the cylinder head and cylinder block of a four-cylinder diesel engine was investigated under the mo.st severe test conditions, at the rated speed and with a full load, by changing the performance parameters such as the main injection timing, the fuel pressure in the common rail, the boost pressure, the exhaust gas recirculation, the fuel quantity of the pilot injection, the timing of the pilot injection, the fuel quantity of the postinjection, and the timing of postinjection. Experimental results showed that the main injection timing among other parameters was the parameter that influenced the thermal load most at the rated engine speed and under a full load condition.

Spray and Combustion Investigation of Post Injections under Low-Temperature Combustion Conditions with Biodiesel

“…Since then, multiple injection strategies are commonly employed in modern engines to achieve a range of improvements, such as refined engine control, reduced combustion noise, lower soot production and/or enhanced soot oxidation. [5][6][7][8] Post injection is a multiple injection strategy that involves the introduction of a small quantity of fuel after the end of main injection event. The post injection strategy is generally used as a measure to reduce soot emissions, or to enable exhaust gas after-treatment technologies.…”

“…The development and implementation of injection systems that are capable of advanced injection strategies, such as multiple injection, which began in the early 1990s, paved the way for considerable research − and interest into the application of such strategies. Since then, multiple-injection strategies are commonly employed in modern engines to achieve a range of improvements, such as refined engine control, reduced combustion noise, lower soot production, and/or enhanced soot oxidation. − …”