Fuel quality dependent injection control system for diesel vehicle and method thereof

The present invention, more particularly, how the fuel quality per injection control of a diesel vehicle to provide optimal combustion performance by adjusting the injection timing depending on the cetane number variation of the diesel fuel to a fuel injection control apparatus and method for a diesel vehicle is started do. The process of determining that the invention detects the operation information including the displacement, speed of the engine speed, cooling water temperature, an accelerator pedal satisfies the cetane number measurement mode; When it satisfies cetane number measurement mode, the process for detecting a cylinder-specific combustion pressure by injecting a pilot quantity of fuel; Cylinder process for calculating a heat release rate in each combustion pressure; Process to produce a heat release rate from the combustion start timing to calculate the ignition delay time from fuel injection timing to the combustion start timing; Calculating a difference between the ignition delay time by comparing the ignition delay time and the ignition delay time of a standard fuel of the current injected fuel; Determining the quality of the cetane number of the fuel according to the difference in the ignition delay time, and comprising the step of adjusting the injection timing of the fuel.