| 摘要 |
PURPOSE:To simplify an input processing circuit by reducing a number of shield electric wires by interrupting the primary side of an iginition coil corresponding to an information signal accompanying the rotation number of an engine, and, at the same, controlling electronic equipment controlled corresponding to the rotation of the engine. CONSTITUTION:When an ignition switch 2 is closed and an engine is rotated, electromotive force is induced in a pick-up coil 5b and, when said electromotive force comes to positive potential, transistors T1, T2 are brought to a continuity state. The current flowing to a primary coil 3a is interrupted by the continuity and discontinuity operation of the transistor T1 and electromotive force is induced in a secondary coil 3b. This electromotive force is distributed to the spark plugs of cylinders. A rectangular wave pulse line signal corresponding to the circuit of the engine appears in the input terminals of various equipment 4a-4c by the continuity and discontinuity of the transistor T2 and various operation circuits such as a CMOS type IC is directly driven by the pulse line signal. |
