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| 基金项目:This work was supported by Toyota Motor Corporation. |
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| Cylinder pressure based combustion phase optimization and control in spark-ignited engines |
| Y. Zhang,T. Shen |
| (Department of Engineering and Applied Sciences, Sophia University, Chiyoda-ku Tokyo, 102-8554, Japan) |
| Abstract: |
| 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 proportional-integral (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. |
| Key words: Combustion phase optimization, extremum seeking, feedback control, cylinder pressure, spark-ignited engine |
