Abstract
The paper presents a control circuit made in Xilinx and which allows the adjustment of the frequency and the duty cycle of the control signal of an injector. The control circuit contains an oscillator and a selection circuit that provide specific commands to a counter. The oscillator that provides the clock frequency of a counting circuit uses the Nexis 4 DDR module’s own frequency. This is to be divided to the desired value by means of a divider implemented soft which makes changing the frequency easy. The signal obtained at its output commands a counter at which the maximum value of numbers is changed by a circuit selection. Thus, the variable duty cycle of the output signal of the development board is obtained, which is amplified both in voltage and in current, for compatibility with the injector parameters. The paper presents waveform obtained when resistive load operation as well as quantities of fuel injected in a given time interval.
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