| 摘要 |
PURPOSE:To improve accuracy in detecting fuel injection time by providing in a fuel injection time detector a means for misreading noise signals generated by combustion in a cylinder other than that on which a lift sensor is mounted as original fuel injection time signals. CONSTITUTION:A fuel injection time detector is provided with counters 28, 35 for repeating the counting and resetting of crank angle reference signals S3 corresponding to respective cylinders of an engine by times corresponding to the number of cylinders. Also, an engine speed judging device for judging whether or not the engine speed exceeds a predetermined value is contituted from a comparator 31, a counter 28, a DA converter 29 and a divider 30 to change over the reset signal S2 of the counter by the output signal S4 to the rise signal of the crank angle reference signal S3 by switching device 32, 34. Further, said detector is provided with a flip flop circuit 39 reset by the signal of a lift sensor 21 and the injection time is figured out according to a period when this circuit 39 is reset. |
