Diesel Engine HCCI/Conventional Combustion Dual-mode Based on Electronic-controlled Injection Timing and EGR Ratio

Due to the limitation of HCCI at high load,the combustion dual-model of vehicle engine was developed based on electronic-controlled injection timing and EGR ratio.With the dual-mode of HCCI pre-mixed combustion at low and medium load and diffusion combustion at high load,the performance defect of HCCI at high load was avoided.The influences of injection angle and EGR ratio on diesel performance in the region of HCCI were further researched and the cylinder pressure and heat release ratio of HCCI combustion was analyzed.Through the optimization of injection quantity map and injection timing map and the acquisition of knock torque,the torque range and the torque curve of transition region in the combustion dual-mode was determined.The experiment result shows,combining the VP37 electronic-controlled pump with electronic-controlled EGR,the quasi HCCI combustion is realized within the range of certain load by increasing the injection angle,which reduces the NOx and soot emission.Using the conventional combustion mode at high load,the CA4D32TC diesel engine works with the dual-mode and has a better performance.