DefinePK

Abstract

The fuel injection rate of a diesel piezo injector was measured using a scale and a positive displacement flow meter (PDFM). The measurement results of the injected fuel quantity were compared in each case. The piezo injector was driven by a microcontroller. The piezo injector driver is designed to charge and discharge current to the piezo injector. The control signal was generated by a microcontroller. The fuel injection durations used in this study were 0.5, 1.0 and 2.0 ms. the common rail pressure was controlled under the three conditions of 30, 100, and 150 MPa. The injected fuel mass per injection was calculated from the total injected fuel mass when the fuel injection was repeated 500 times. The lower the rail pressure, the greater the variation in the injected fuel mass. Variations in the injected fuel quantity per injection with the injection duration were reduced with longer fuel injection durations. In all injection conditions, the accuracy of the scale was higher than that of the PDFM.