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《Journal of Zhejiang University(Engineering Science)》 2014-01
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Performances of vehicle engine air compression braking

WANG Lei;LI Dao-fei;YE Jin;XU Huan-xiang;YU Xiao-li;Department of Energy Engineering,Zhejiang University;  
A novel engine regenerative braking method was presented which adopts a check valve for energy recovery based on the idea of braking energy recovery through compressed air.A single cylinder gasoline engine prototype was modeled and validated with preliminary test by using thermodynamics and gas dynamics theory.Engine braking performances at steady state simulations were discussed,including engine braking torque and energy recovery efficiency with different engine speed and tank pressure.Transient simulations of vehicle deceleration were conducted to analyze tank pressure accumulating and energy recovery efficiency.Results show that the difference between maximum pressure in engine cylinder and tank pressure is the crucial factor influencing braking characteristics.The engine braking torque and efficiency can both increase with higher compression ratio.At steady state simulation cases,the braking torque reaches 54%of the maximum driven torque of engine conventional mode and the maximum energy recovery efficiency reaches 8.5%.Vehicle braking simulation at certain conditions shows an effective deceleration and efficiency of 10.2%.
【Fund】: 国家“973”重点基础研究发展规划资助项目(2011CB707205);; 国家自然科学基金资助项目(50976104)
【CateGory Index】: U464
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