This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Evaluation of Low-Pressure EGR System on NO x Reduction Potential of a Supercharged LCR Single-Cylinder Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 29, 2022 by SAE International in United States
Annotation ability available
Supercharging a single-cylinder diesel engine has proved to be a viable methodology to reduce engine-out emissions and increase full-load torque and power. The increased air availability of the supercharger (SC) system helps to inject more fuel quantity that can improve the engine's full-load brake mean effective pressure (BMEP) without elevating soot emissions. However, the increased inlet temperature of the boosted air and the availability of excess oxygen can pose significant challenges to contain oxides of nitrogen (NOx) emissions. Hence, it is important to investigate the potential NOx reduction options in supercharged diesel engines. In the present work, the potential of low-pressure exhaust gas recirculation (LP EGR) was evaluated in a single-cylinder supercharged diesel engine for its benefits in NOx emission reduction and impact on other criteria emissions and brake specific fuel consumption (BSFC).
A mass-production single-cylinder diesel engine was used for the present work after reducing its compression ratio (CR) from 18:1 to 14:1 that was needed to contain the peak firing pressure (PFP) with the SC setup. The experimental investigations revealed that the migration from the stock naturally aspirated (NA) intake system to the supercharged system resulted in a considerable increase in NOx emissions across the loads. Hence, LP EGR was introduced in the engine by an additional circuit that connected the diesel particulate filter (DPF) to the inlet port of the supercharger. An electric valve was used to control the mass flow rate of the EGR. The results concluded that the introduction of LP EGR and increased EGR rates up to 20% could reduce the NOx emissions by 52% at a reference operating point of 2000 rpm, 40 N-m. Moreover, the benefits could be obtained without any penalty on BSFC. On the contrary, in the SC system without LP EGR, for the same level of NOx reduction, the main injection timing had to be retarded significantly, resulting in a 5 % penalty on BSFC. Thus, the LP EGR system was highly beneficial in supercharged diesel engines to reduce engine-out NOx emissions without elevating the BSFC results.
CitationVellandi, V., Krishnasamy, A., and Ramesh, A., "Evaluation of Low-Pressure EGR System on NOx Reduction Potential of a Supercharged LCR Single-Cylinder Diesel Engine," SAE Technical Paper 2022-01-0447, 2022, https://doi.org/10.4271/2022-01-0447.
- Shah , S.D. and Kevin , H. Emission Control Options and Optimization for BSVI Heavy Duty Diesel Applications SAE Technical Paper 2017-26-0120 2017 https://doi.org/10.4271/2017-26-0120
- T. G. O. India 16/9/2016 https://morth.nic.in/Motor-Vehicle-Legislation
- Kang , W. , Pyo , S. , and Kim , H. Comparison of Intake and Exhaust Throttling for Diesel Particulate Filter Active Regeneration of Non-Road Diesel Engine with Mechanical Fuel Injection Pump International Journal of Engine Research 2020
- Pla , B. , Bares , P. , Sanchis , E. , and Aronis , A. Ammonia Injection Optimization for Selective Catalytic Reduction Aftertreatment Systems International Journal of Engine Research 1-11 2020
- Kusaka , J. , Sueoka , M. , Takada , K. , Ohga , Y. et al. A Basic Study on a Urea-Selective Catalytic Reduction System for a Medium-Duty Diesel Engine International Journal of Engine Research 2004
- Alimin , A.J. , Benjamin , S.F. , and Roberts , C.A. Lean NOx Trap Study on a Light-Duty Diesel Engine Using Fast-Response Emission Analysers International Journal of Engine Research 2009
- Julaha , P. , Arde , V. , and Chirakkal , R. Effect of Eccentric Imbalance of Various Crank Train Components on Vibrations in Single Cylinder Diesel Engines SAE Technical Paper 2019-28-2417 2019 https://doi.org/10.4271/2019-28-2417
- Buchman , M.R. and Winter , A. Investigating the Effect of Intake Manifold Size on the Transient Response of Single Cylinder Turbocharged Engines SAE Technical Paper 2017-24-0170 2017 https://doi.org/10.4271/2017-24-0170
- Vikraman , V. , Krishnasamy , A. , and Ramesh , A. Regulated Intake Air Boosting and Engine Downspeeding as a Viable Solution for Performance Improvement and Emission Reduction of a Single-Cylinder Diesel Engine SAE International Journal of Engines 15 2 2021
- Vikraman , V. , Ramesh , A. , and Krishnasamy , A. A Holistic Approach to Develop a Common Rail Single Cylinder Diesel Engine for Bharat Stage VI Emission Legislation SAE Technical Paper 2020-01-1357 2020 https://doi.org/10.4271/2020-01-1357
- Chaoran , D. , Fujita , Y. , Ichiyanagi , M. , and Suzuki , T. Adaptation of Turbocharger to Small Displacement Single Cylinder SI Engine SAE Technical Paper 2015-32-0823 2015 https://doi.org/10.4271/2015-32-0823
- Buchman , M. , Ramanujan , D. , and Winter , A.G. A Method for Turbocharging Single-Cylinder, Four-Stroke Engines SAE International Journal of Engines 2018
- Chen , S.K. Simultaneous Reduction of NOx and Particulate Emissions by Using Multiple Injections in a Small Diesel Engine SAE Technical Paper 2000-01-3084 2000 https://doi.org/10.4271/2000-01-3084
- Benajes , J. , Molina , S. , and García , J.M. Influence of Pre- and Post-Injection on the Performance and Pollutant Emissions in a HD Diesel Engine SAE Technical Paper 2001-01-0526 2001 https://doi.org/10.4271/2001-01-0526
- Vikraman , V. , Anand , K. , and Ramesh , A. Novel Strategies to Overcome the Limitations of a Low Compression Ratio Light Duty Diesel Engine International Journal of Engine Research 22 9 2021 2830 2851