DEVICE FOR CONTROLLING PROGRAMMABLE FUEL INJECTION CURRENT WAVE-FORM AND METHOD FOR OPERATING THE SAME

PROBLEM TO BE SOLVED: To comply with multiple different fuel injectors and improve an economical property by forming multiple current wave-forms for injection and provide a controlling circuit capable of producing one of the multiple current waveforms in response to the required current wave-form parameter and controlling signal. SOLUTION: A control circuit 30 to which electric controller 15 is connected includes a multiplexor 35, a comparater 40, and an injection controller 45, and receives multiple current wave parameters 60-63 and multiple control signals 35. An electric controller 15 produces an injection signal 70, a control line 75, and a data line 76 and outputs them to the injection controller 45. The injection controller 45 transmits a judging signal to control lines 80, 85, for discriminating an inputted signal to be generated in an output 30 of the multiplexor 35 from among inputted signals 60-63, while an output 90 from the multiplexor 35 and an electric current feed back signal 95 from a current mirror circuit 100 are compared with each other by a comparator 40 and the result of comparation is inputted to control a switching circuit 110.