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This paper, by using the HYDSIM software for numerical calculation TBD234V12 diesel engine fuel injection system. Of TBD234V12 diesel engine fuel injection system, jet orifice number, jet orifice diameter, high pressure tubing diameter, high pressure tubing length, plunger efficient stroke, key factors such as CAM contour line to do a detailed comparison and analysis. Through comprehensive analysis of the calculation results, some key parameters affecting the diesel engine fuel injection system performance, they are drawn to the law of needle valve lift, oil injection, the influence of the cumulative injection amount, and other important indicators, without change the diesel engine fuel injection system were put forward. The overall structure of the original case, improvements of TBD234V12 diesel engine fuel injection system, optimization of its main performance parameters. Used by the simulation results show that this design method is feasible, the mathematical model and calculation method is correct. Optimized fuel injection system is the injection system performance is improved greatly, reduce the chance of secondary injection, injection rate, increases the lower the Hertz contact stress, oil pump CAM reduces the impact of the moving parts and vibration, improve the service life. To improve optimization purpose of TBD234V12 diesel engine fuel injection system.
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