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| Experimental Study of Collaborative Optimization Based on Multiple Injection Parameters for Small Diesel Engines |
| DOI：10.13949/j.cnki.nrjgc.2022.06.001 |
| Key Words:diesel common rail injection strategy non-road emission parameter sweep collaborative optimization |
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| Abstract:Experimental study was conducted on a 1.06 L non-road stage Ⅲ horizontal diesel engine to investigate the influence of single and coupled multiple injection parameters on fuel consumption and emission under 8 working conditions of non-road stage Ⅳ steady state emission test cycle. The injection parameters include common rail fuel pressure， injection timing， pilot-main injection separation and pilot fuel injection quantity. In order to reach non-road stage Ⅳ emission level， brake specific fuel consumption（BSFC） and emission species such as NOx were selected as optimization objectives and finely calibrated by injection parameter sweeping. The engine performance optimization solution was obtained by analyzing the influence sensitivity of each injection parameter on fuel consumption and emission. Results show that the injection timing and rail pressure have significant impacts on fuel consumption， NOx and CO emissions but less effect on HC emission. Pilot-main injection interval and pilot fuel quantity have obvious influence on heat release rate and CO emission， but minimum on other emissions. Suitable calibration coupled with rail pressure and injection timing can get the best NOx–BSFC trade-off relationship. In addition， HC emission can be reduced effectively by tuning pilot injection. The weighted 8-mode emissions results， with multi-parameters collaboratively optimized， were 0.09 g/（kW·h） for particulate matter（PM） emission， 4.17 g/（kW·h） for the sum of HC emission and NOx emission， and 1.46 g/（kW·h） for CO emission， indicating that the original engine has been upgraded and the emissions have reached the non-road stage Ⅳ level. |
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