| 摘要 |
A signal is derived from the primary of the ignition coil. The signal is amplitude limited, has negative portions removed, and is smoothed and extended in time by a determined time interval. The trailing edge of the so-extended signal is steep since it results from cut off from a transistor. The leading edge of the pulse is used to trigger a multivibrator having a negative output signal. The multivibrator signal and the extended signal are applied to an AND gate where the output comprises the extended signal after subtraction of the negative pulse from the multivibrator. The resulting signal has a determined phase angle to the start of the spark and a rectangular shape with sharp leading and trailing edge.
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