The excessive oil consumption and blow-by in the cylinder of a diesel engine will have a negative effect on a sharp decline in the brake power, an increase in the brake specific fuel consumption, the increase of exhaust particles and the friction loss work between the friction pairs of the combustion chamber components and so on. The thesis, therefore, intends to study the variation of the oil consumption and the blow-by between the piston ring groups in cylinder within the engine running, and find out the effective method to reduce the emission of harmful particles. Taking one China Ⅳ off-road diesel engine as the research object, the simulation model of oil consumption and blow-by with piston group was established and verified by experiments. The comparative analysis of the test and simulation results shows that the maximum relative deviation between the simulated value and the experimental value of lubricant consumption is 4.58%; the comparison between the simulated value and the measured value of the blow-by quantity shows that the trend tends to be consistent, and the maximum deviation is 4.27%, which shows that the diesel engine lubricant consumption and blow- can be accurately predicted and analyzed by the simulation model. By analyzing the lubricating oil consumption and blow-by of the diesel engine cylinder, the maximum lubricating oil consumption of this four-cylinder engine was 14.3 g/h when engine speed was 2400 r/min under the condition of 100% load, there was a difference of 12.3 g/h compared with the minimum lubricating oil consumption; the maximum total blow-by was 57.0 L/min, which was an increase of 23.9% compared with the minimum; the largest blow-by peak occurred in the first cylinder, and its value was 15.6 L/min, which was 31.4% larger than the minimum blow-by peak of the second cylinder.
China Ⅳ Off-Road Diesel Engine; Fluid-Solid Coupling; Lubricating Oil Consumption; Piston Assembly Blow-By; Friction Loss; Experimental Study and Simulation Analysis
第二届世界内燃机大会The 2nd World Congress on Internal Combustion Engines