Model Based Control for Premixed Charge Compression Ignition Diesel Engine
Premixed charge compression ignition (PCCI) combustion is effective to reduce diesel engine harmful exhaust gas and improve fuel consumption. However, PCCI combustion has a problem of low combustion stability compared to diesel diffusive combustion, and there are few examples of application to mass production engines. In addition to engine speed and load, it needs complicated injection control according to environmental conditions such as outside air temperature, pressure, and engine water temperature, and transient changes such as supercharging delay, EGR delay, and intake air temperature delay. Although there is example where the control maps are switched according to the intake condition, it needs huge maps considering all the parameters mentioned above. Thus it requires a significant calibration man-hour. And this may lead to deterioration of reliability such as combustion noise and torque fluctuation.