| Research on Variable Displacement Valve Control Strategy Based on Electro-hydraulic Drive Intake and Exhaust Valve Opening and Closing Mode
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| Zhaohui Jin 1, Dayou Lu 1, Tian You 2, Fangxi Xie 1 |
1College of Automotive Engineering , Jilin University
2Changchun Vocational Institute of Technology |
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| ABSTRACT |
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Based on the self-developed hydraulic variable valve mechanism of four-cylinder engine, this paper proposes a variable displacement valve control strategy based on the VOC-CDA mode of electro-hydraulic. The variation rules of in-cylinder pressure, oxygen mass fraction in exhaust gas, torque fluctuation and other parameters in the process of cylinder deactivation cycle and working mode conversion are analyzed, and the control parameters of inlet and exhaust valves at the best cylinder deactivation time are optimized. The energy saving mechanism of variable displacement technology is analyzed from the aspects of indicated thermal efficiency, mechanical efficiency and effective thermal efficiency. Based on the optimal intake and exhaust valve closing time, the engine can improve the fuel economy by 8.7% at medium and small loads. It provides a certain design reference for the development of variable displacement engine based on hydraulic variable valve mechanism.
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| Key Words:
Gasoline engine, Hydraulic variable valve mechanism, Variable displacement, Intake and exhaust valve opening and closing mode control strategy, Energy distribution characteristics, Automotive Engineering
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Corresponding Author.
Fangxi Xie , Email. 
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