Design and Dynamic Analysis of the Multi-link Mechanism for Variable Compression Ratio Engine

Xu Kai; Feng Zengming; Yang Jinxing; Chu Yaxu

doi:10.16578/j.issn.1004.2539.2022.12.025

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Design and Dynamic Analysis of the Multi-link Mechanism for Variable Compression Ratio Engine

Development·Application | 更新时间：2023-01-06

- Design and Dynamic Analysis of the Multi-link Mechanism for Variable Compression Ratio Engine
- Journal of Mechanical Transmission Vol. 46, Issue 12, Pages: 161-168(2022)
- 作者机构：
  
  1.长春汽车工业高等专科学校汽车运用学院，吉林长春 130013
  2.吉林大学机械与航空航天工程学院，吉林长春 130021
  3.北华大学机械工程学院，吉林吉林 132013
- 作者简介：
- 基金信息：
- DOI：10.16578/j.issn.1004.2539.2022.12.025
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徐凯,冯增铭,杨金兴等.可变压缩比发动机多连杆机构设计及动力学分析[J].机械传动,2022,46(12):161-168.

Xu Kai,Feng Zengming,Yang Jinxing,et al.Design and Dynamic Analysis of the Multi-link Mechanism for Variable Compression Ratio Engine[J].Journal of Mechanical Transmission,2022,46(12):161-168.
徐凯,冯增铭,杨金兴等.可变压缩比发动机多连杆机构设计及动力学分析[J].机械传动,2022,46(12):161-168. DOI： 10.16578/j.issn.1004.2539.2022.12.025.

Xu Kai,Feng Zengming,Yang Jinxing,et al.Design and Dynamic Analysis of the Multi-link Mechanism for Variable Compression Ratio Engine[J].Journal of Mechanical Transmission,2022,46(12):161-168. DOI： 10.16578/j.issn.1004.2539.2022.12.025.

摘要

发动机压缩比是影响汽油发动机热效率的因素之一，发动机需要根据实际工况匹配最佳压缩比以满足实际要求。因此，可变压缩比技术有助于实现不同工况下发动机动力性和燃油经济性之间的平衡。为此，根据发动机原理，设计了一种可变压缩比发动机多连杆机构，通过运动学建模计算与仿真结果对比分析，验证了机构设计的正确性。基于多体动力学仿真分析，综合考虑燃烧力负载和曲轴转速等边界条件，探究了多连杆机构随控制轴转角的变化规律，对多连杆机构在不同压缩比条件下的运动学及动力学特性进行评价，并与传统单连杆机构进行了详细对比分析。结果表明，多连杆机构可通过实现压缩比实时可变来满足实际工况的需要，在动力放大特性及抑制活塞与缸壁间摩擦等方面存在力学优势，并能在发动机振动方面带来额外的动态效益。

Abstract

The compression ratio of engines is one of the factors affecting the thermal efficiency of gasoline engines. The engine needs to match the best compression ratio according to the actual conditions to meet the actual requirements. Therefore, variable compression ratio technology can help achieve a balance between engine power and fuel economy under different operating conditions. Thus, a multi-link mechanism for variable compression ratio engine is designed based on the engine principle. The correctness of the mechanism design is verified by kinematics theory modeling calculation and comparative analysis of simulation results. Based on multi-body dynamics theory and considering boundary conditions such as combustion load and crankshaft speed comprehensively, the variation rule of the multi-link mechanism with control shaft rotation angle is explored; the kinematic and dynamic characteristics of the multi-link mechanism under different compression ratio conditions are evaluated, compared and analyzed in detail with those of the traditional single-link mechanism. The results show that the multi-link mechanism can realize real-time variable compression ratio to meet the actual operating conditions, has mechanical advantages in power amplification characteristics and restraining friction between piston and cylinder wall, and brings additional dynamic benefits in engine vibration.

关键词

发动机变压缩比多连杆机构机构设计多体动力学

Keywords

EngineVariable compression ratioMulti-link mechanismMechanism designMulti-body dynamics

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