Using Exhaust Throttle to Implement Closed-loop Control of Combustion Timing in a Gasoline HCCI Range Extending Engine

• Main Authors: CHUN-WEN Li, 李群文
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/58643280344706586935

碩士 === 國立臺灣科技大學 === 機械工程系 === 102 === Homogeneous Charge Compression Ignition (HCCI) engines have received significant attention in recent years due to their high efficiencies and extremely low NOx emissions.However, unlike the conventional engines, the combustion timing of HCCI engines depends on the cylinder mixture conditions such as temperature, pressure and compositions.Therefore, regulation of combustion timing becomes a critical challenge for the success of HCCI engines.In this study, a single-cylinder 500c.c.engine developed by China Engine Corporation (CEC) is modified by replacing the piston for a higher compression ratio and adding an intake heating system to facilitate the HCCI combustion.An exhaust throttle is also implemented to control the HCCI combustion timing via regulation of the residual gas fraction inside the cylinder.A series of steady-state experiments are conducted to select proper HCCI operating condition.The combustion timing when 50%$ of the fuel is burned (CA50) is estimated real time in the Matlab XPC-target environment.The estimated CA50 timing is then fed back to the Mototron ECU for closed-loop combustion timing control.The closed-loop control system is developed based on the proportional-integral feedback structure.Finally, the closed-loop performance is examined by applying a fuel step change as a disturbance to the combustion timing control system.