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| Performance Optimization of Single-cylinder Motorcycle Engine in Low and Medium Speed |
| Received:February 01, 2021 Revised:February 23, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.07.013 |
| KeyWord:linearity of torque volumetric efficiency cam profile intake and exhaust system resonance effect |
| Author | Institution |
| TANG Yuan-bin |
School of Vehicle Engineering, Chongqing University of Technology, Chongqing , China |
| PANG Kui |
Lifan Technology Group Co., Ltd., Chongqing , China |
| LIAO Shou-chang |
Lifan Technology Group Co., Ltd., Chongqing , China |
| WU Zhi-chang |
Lifan Technology Group Co., Ltd., Chongqing , China |
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| Abstract: |
| This article aims at the problem of poor linearity of torque at low and medium speeds during bench testing of a single-cylinder motorcycle engine. With the CFD method, the thermodynamic simulation analysis software GT-power was used to build and calibrate the engine model, and then the original engine was conducted a thorough analysis. Finally, the goal of performance optimization at low and medium speeds was achieved by optimizing the valve train and intake and exhaust systems of the original plan. It was resulted that the linearity of torque was improved in low and medium speeds and the power performance, fuel economy and emission had reached the project's expected goals in the optimized engine bench test results. The peak power reached 16 kW (9500 r/min), peak torque reached 18.6 N.m(7000 r/min), the minimum specific fuel consumption was 183 g/(kW.h), and the emissions of CO, THC, NOx were 840,83,54 mg/km respectively. The dynamic performance and reliability of the valve train were improved, the fullness coefficient of intake and exhaust cams reached 5.14 and 5.15 respectively. The reason for the poor linearity of the low-speed torque in the original scheme engine was the low volumetric efficiency in this speed range. Optimizing the parameters of cam profile, air filter, muffler and exhaust pipe could make better use of the resonance effect of intake and exhaust pipes to improve the low and medium speed dynamic performance of engine. |
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