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High accuracy of diesel simulation over whole operating range

Truck diesel YaMZ-238D

     Due to the advanced mixture formation and combustion model, software allows predicting with high accuracy heat release and other parameters of engines over the whole operating range including low capacity and idling. 

     For all operating modes the injection profiles have to be specified. Parameters of injection may be obtained from experimental data as well as calculated with software for fuel injection system simulation.

      Fig. 1 shows diagrams of simulated mixture formation and heat release rate of truck diesel over the whole operating range, including mode of 7 % capacity when all fuel is injected during induction period.

    Preliminary calibration of engine model was carried out with use of measured data.  All following simulation was performed with identical values of all empirical coefficients.

    Different curves of heat release rate (black curves) at each level of speed and load are presented in right-bottom corner of each pictures.

YaMZ 238 whole oper range FSV.jpg (54218 bytes)

Fig. 1. Diagrams of simulated mixture formation and heat release rate of truck diesel over the whole operating range

# 1     71%

#4     100%
# 2      37% #5      50 %
# 3     7.3% #6       10%

      Click number of picture to enlarge it and start visualization.

      Fig. 2.  shows integral results of truck diesel simulation as compared with the experimental ones.

     Relative error in predicting the power and specific fuel consumption is about 2-3 %, its maximum value is 11 % at mode of 7% capacity.

     Relative error in predicting the nitrogen oxide emission level is from 2.6 to 8.3  % over the whole operating range, except modes of low capacity, where relative error is more.

YaMZ 238 whole oper range Tabl.gif (57435 bytes)

Fig. 2. Diagrams of  integral results of truck diesel simulation as compared with the experimental ones

Experimental data was presented by Yaroslavl Autodiesel.

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