The fully transistorized ignition system consists of the following components: a signal generator (which is made up of the signal generator rotor and pickup coil), ignitor (including a 8-bit microcomputer and a 10 MHz ceramic vibrator), throttle position sensor, two ignition coils and four spark plugs. The ignition timing is programmed and stored in the ignitor's ROM (Read Only Memory).
The signal generator is mounted on the right end of the crankshaft. The induced signal in the signal generator is sent to the wave-form arrangement circuit and the CPU receives this signal and calculates the best ignition timing from the signal of the ceramic vibrator, throttle position sensed by throttle position sensor and data stored in the ROM. The CPU outputs the signal to the transistor of the ignition coil output circuit which is connected to the primary windings of the ignition coils which is turned "off" and "on" accordingly. Thus, it induces the secondary current in the ignition coil's secondary windings and produces the spark between the spark plug gaps.
The ignition cutoff circuit is incorporated in the ignitor to prevent the engine from overreving. If the engine speed reaches 12 000 r/min, this circuit will cutoff the ignition primary current for the #1 and #4 spark plugs.
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