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Effect of Cetane-Coupled Pilot Injection Parameters on Diesel Engine Combustion and Emissions.
Bohua Sun1, Lin Zhang2, Shuai Zhao3,4
1State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China.
ACS Omega
|December 26, 2022
Summary
Higher cetane number fuels and optimized pilot injection strategies improve diesel engine efficiency and reduce particulate matter. However, increasing pilot injection can raise CO, HC, and NOx emissions.
Area of Science:
- Internal Combustion Engines
- Combustion Science
- Emission Control
Background:
- Diesel engines are crucial for transportation and industry.
- Optimizing combustion is key to improving efficiency and reducing harmful emissions.
- Pilot injection is a strategy to control diesel combustion, but its effects need further study.
Purpose of the Study:
- To investigate the impact of cetane number, pilot injection ratio, and timing on diesel engine performance and emissions.
- To understand the complex interplay between these parameters.
- To redefine ignition delay and combustion duration under pilot injection conditions.
Main Methods:
- Experimental investigation of a four-cylinder diesel engine.
- Varying cetane number, pilot injection ratio, and pilot injection timing.
- Measurement of cylinder gas pressure, heat release rate, fuel consumption, efficiency, and emissions (CO, HC, NOx, PM).
Main Results:
- Increasing pilot injection ratio boosted peak cylinder pressure and heat release rate, while decreasing particulate matter emissions.
- Higher cetane number improved brake thermal efficiency and reduced brake specific fuel consumption.
- Delayed pilot injection timing increased peak cylinder pressure and efficiency but also raised CO and HC emissions while lowering NOx.
- Pilot injection heat release was observed only above a 20% pilot injection ratio.
Conclusions:
- Cetane number and pilot injection parameters significantly influence diesel engine combustion, efficiency, and emissions.
- Careful optimization of pilot injection strategy is needed to balance performance gains with emission control.
- Further research is required to fully understand and leverage pilot injection for cleaner and more efficient diesel combustion.
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