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| Optimization Study on Key Parameters Influencing Friction and Slap Characteristics of Pistons |
| DOI：10.13949/j.cnki.nrjgc.2021.02.013 |
| Key Words:piston slap energy friction loss response surface multi-objective optimization |
| Author Name | Affiliation | | YANG Jing, WU Jie, ZHANG Yong,TAO Wenzhu, FAN Xiangbin, XIE Peng | 1.Vehicle Engineering Department,Chongqing University of Technology,Chongqing 400054,China
2. Key Laboratory of Manufacture and Test Techniques for Automobile Parts,Ministry of Education,Chongqing University of Technology,Chongqing 400054,China |
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| Abstract:As friction,wear and slap of pistons has adverse impact on the comprehensive performance of the engine, the early abnormal wear phenomenon of a small gasoline engine piston was studied. By building a dynamics simulation model of piston, the impact factors of slapping and friction were analyzed. A method of optimizing the key influencing parameters of piston friction and slap characteristics by using response surface model is proposed. To improve piston friction and slap characteristics, the multi-objective optimization model is established by taking piston profile, cylinder clearance, piston pin offset and crankshaft offset as optimization design variables, and taking the minimum value of kinetic energy peak value and the minimum friction loss as optimization objectives. The optimization results show that the optimized design parameter matching can reduce the friction loss of piston group by 9.13% and the maximum slap energy by 29.20% under the maximum torque condition of the studied engine. Finally, the bench test is carried out in the optimized prototype. The test results show that the engine power, torque and mechanical efficiency averagely increase by 2.37%, 2.54% and 2.06% respectively， while the fuel consumption rate decreases by 1.19% on average and the wear condition of the piston was improved. |
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