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Search for Optimizing Control Method of Homogeneous Charge Diesel Combustion
Technical Paper
1999-01-0184
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
As a method for reducing exhaust emissions from diesel engines, we have experimented on a homogeneous charge diesel combustion technique (HCDC) whereby a portion of fuel is supplied into the intake port to form a homogeneous premixture, this is then fed into the cylinder from the intake port before ignition of the diesel fuel, which is injected directly into the cylinder. Our results have indicated possibilities of substantially reducing both NOx and smoke emissions.
If diesel fuel is premixed with air, the premixture under-goes excessively early self-ignition, making it difficult to maintain ignition timing near top dead center and hence limiting the engine operating conditions. While an important target in emission reduction is to realize stable low-emission combustion during a high-load operation, the actual operation of diesel engines mostly involves partial-load conditions. Consequently, diesel emissions can be drastically reduced if HCDC enables low-emission combustion, even in the partial-load operation range.
In this study, therefore, we attempted to improve combustion and reduce emissions in the low- and medium-load operation range by means of DI fuel injection timing control and EGR. For the full load conditions, we tried to optimize HCDC by using diesel fuel with an oxygen-containing compound having a high anti-knock property.
Our results indicated that NOx emissions can be substantially reduced, without increasing smoke emissions, under half-throttle and low premixed fuel ratio conditions by retarding (optimizing) the DI fuel injection timing. This NOx reduction effect was equivalent to that obtainable under a high premixed fuel ratio condition. We also found that NOx emissions can be reduced without increasing smoke emissions through optimization of premixed fuel ratio and EGR rate.
Furthermore, we were able to confirm the reduction of both NOx and smoke emissions when HCDC was made effective over the entire engine operation ranges through mixing of MTBE into diesel fuel. Additional reductions in NOx and smoke emissions were achieved through retarding of DI fuel injection timing.
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Citation
Odaka, M., Suzuki, H., Koike, N., and Ishii, H., "Search for Optimizing Control Method of Homogeneous Charge Diesel Combustion," SAE Technical Paper 1999-01-0184, 1999, https://doi.org/10.4271/1999-01-0184.Also In
References
- Takeda Y. et al. “Emission Characteristics of Premixed Lean Diesel Combustion with Extremely Early Staged Fuel Injection” SAE Paper 961163 1996
- Ryan T.W. III Callahan T.J. “Homogeneous Charge Compression Ignition of Diesel Fuel” SAE Paper 961160 1996
- Suzuki H. et al. “Exhaust Purification of Diesel Engines by Homogeneous Charge with Compression Ignition Part 1: Experimental Investigation of Combustion and Exhaust Emission Behavior under Pre-mixed Homogeneous Charge Compression Ignition Method” SAE Paper 970313 1997
- Yokota H. et al. “A New Concept for Low Emission Diesel Combustion” SAE Paper 970891 1997
- Suzuki H. et al. “Combustion Control Method of Homogeneous Charge Diesel Engines” SAE Paper 980509 1998
- Hashizume T. et al. “Combustion and Emission Characteristics of Multiple Stage Diesel Combustion” SAE Paper 980505 1998
- Alperstein M. Swim W. B. Schweitzer P. H. “Fumigation Kills Smoke, Improves Diesel Performance” SAE Trans. 66 1958 574
- Yanagihara H. et al. “A Study of DI Diesel Combustion under Uniform-Higher Dispersed Mixture Formation” Proceedings of The 13 th Internal Combustion Engine Symposium 365 369 1996
- Kimura S. et al. “A New Concept of Combustion Technology in Small DI Diesel Engines -Possibility of Expanding Low Temperature, Premixed Combustion Range-” Proceedings of 1997 JSAE Spring Meeting No.972 145 148 1997
- Suzuki H. et al. “Effect of EGR on Combustion and Exhaust Emission of a Supercharged Diesel Engine” Bulletin of JSAE 26 3 1995