Experimental heat release rate curves are redrawn by taking experimental values ​​of premixed and diffusion combustion phase versus appropriate ranges of crank angle ( courtesy of Miyamoto et. al [7] ). Simulation heat release rate curves are drawn by taking the values ​​summarized in this work at similar crank angle ranges. The comparison between the simulated and experimental heat release rates with diesel operation at 0.3 MPa bmep and 0.6 MPa bmep is shown in Fig. 1 and Fig. 2, respectively. The deviation in the maximum heat release rate between simulation and experimentation was 5.7% and 3.4% lower at 0.3 MPa bmep and 0.6 MPa bmep, respectively. The efficiency factor “a” is invariably used the same way for both premixed and diffusion combustion phases in the double wiebe function in the previous study. In this simulation, two separate efficiency factors “ap” and “ad” are used for the premixed and diffusion combustion phases respectively. The heat release rate at different powers is predicted by simultaneously determining the efficiency factor "ap" of the premixed combustion phase and the form factor "md" of the diffusion combustion phase with the help of the load correction factor ( lc). The predicted heat release rate agreed well with that of the experiment, as shown in Figs. (1 and 2). It is deduced that the efficiency factor “ap” and shape factor “md” are not load independent when simulating the premixed and diffusion combustion phases, as shown in Figs. (3 and 4). In fact the load correction factor (lc) is the measure of the load dependence and determines these two factors for different loads in carrying out the simulation of the heat release rate. Likewise, the energy of the premixed combustion fuel is not half the fuel energy of the ignition delay period in the synth...... middle of the document ......Injected diesel engine managed with DME,” SAE document 972973.[7] Noboru Miyamoto, Takemi Chikahisa, Tadashi Murayama, and Robert Sawyer, “Description and Analysis of Diesel Engine Combustion Rate and Performance Using Wiebe Functions,” SAE document 850107.[ 8] Heywood, J. B, Higgins, J. M, Watts, P. A, and Tabaczynski, R. J, “Development and Use of a Cycle Simulation to Predict SI Engine Efficiency and NOx Emissions,” SAE Document 790291, 1979.[9 ] Dennis N. Assanis and John B. Heywood, “Development and Use of a Turbocharged Diesel System Computer Simulation for Studies of Engine Performance and Component Heat Transfer,” SAE Document No. 860329, 1986.[10] Rowland S. Benson, White House ND, "Internal Combustion Engines", Pergamon Press Ltd, 1979.[11] Ganesan V., "Computer Compression-Ignition Engine Simulation Process", University press ltd., 2000.