Cylinder pressure based combustion phase optimization and control in spark-ignited engines
Yahui ZHANG
Tielong SHEN
摘要：Efficiency and emissions of spark-ignited engines are significantly affected by combustion phase which can usually be indicated by crank angle of 50％ mass burnt (CA50).Managing combustion phase at the optimal value at which the maximal efficiency can be achieved is a challenging issue due to the cyclic variations of combustion process.This paper addresses this issue in two loops:CA50 set-point optimization (outer loop) and set-point tracking (inner loop) by controlling spark advance (SA).Extremum seeking approach maximizing thermal efficiency is employed in the CA50 set-point optimization.A proportionalintegral (PI) controller is adopted to make the moving average value of CA50 tracking the optimal CA50 set-point determined in the outer loop.Moreover,in order to obtain fast responses at steady and transient operations,feed-forward maps are designed for extremum seeking controller and PI controller,respectively.Finally,experimental validations are conducted on a six-cylinder gasoline at steady and transient operations to show the effectiveness of proposed control scheme.
机标关键词：thermal efficiencymoving averagecontrol schemePI controller
论文发表日期：2017-01-01
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：9( 83-91 )
英文信息