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Operating parameters optimization for lower emissions in diesel engine with PCCI-DI mode using Taguchi and grey
Getachew Alemayehu1, Deresse Firew1, Ramesh Babu Nallamothu1
1Department of Mechanical Engineering, Adama Science and Technology University, Nazareth, Ethiopia.
Heliyon
|June 17, 2022
Summary
Optimizing low-temperature combustion (LTC) in PCCI-DI engines using dieseline and methanol significantly cuts NOₓ and smoke emissions. Advanced injection timing proved most effective for emission reduction.
Area of Science:
- Internal Combustion Engines
- Combustion Science
- Environmental Engineering
Background:
- Low-temperature combustion (LTC) modes offer advantages in reducing nitrogen oxides (NOₓ) and particulate matter (PM), alongside fuel consumption.
- However, LTC faces challenges with increased hydrocarbon (HC) and carbon monoxide (CO) emissions.
- Ultra-low emission engines for automotive applications remain an active research area.
Purpose of the Study:
- To optimize operating control factors for reduced emissions in a PCCI-DI (Premixed Charge Compression Ignition - Direct Injection) engine under LTC mode.
- Investigate the impact of injection timing, Exhaust Gas Recirculation (EGR) level, dieseline ratio, and engine load on emissions.
- Utilize grey relational analysis (GRA) and Taguchi methods for optimization.
Main Methods:
- Application of Taguchi's L₉ orthogonal array for experimental design and testing.
- Implementation of air-blast methanol intake port supply and dieseline fuel substitution.
- Grey relational analysis (GRA) combined with ANOVA for identifying optimal operating parameters and their influence.
Main Results:
- The optimal combination identified was advanced injection timing (25° before TDC), 25% EGR, 90:10 dieseline ratio, and 75% load (A₂B₁C₃D₃).
- This optimal setting resulted in a 68.02% reduction in NOₓ and a 62.37% reduction in smoke compared to conventional diesel combustion.
- Analysis revealed injection timing as the most influential factor (69.35% contribution), followed by load, dieseline ratio, and EGR level.
Conclusions:
- Dieseline direct injection coupled with methanol port injection effectively reduces emissions in PCCI-DI engines.
- The study demonstrates a viable trade-off for achieving lower NOₓ and smoke while managing HC and CO emissions.
- Optimization through GRA and Taguchi methods provides a systematic approach to enhancing low-emission combustion strategies.
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