| 摘要 |
PURPOSE:To easily perform adjusting work of ignition timing of a device at its mouting to an engine, by utilizing a change of impedance in a capacitor due to a frequency and changing an ignition timing at high and low speeds of the engine. CONSTITUTION:At a low speed, a capacitor C1 is reversely charged by a reverse half wave of a generating oil T1, and a transistor circuit (TrC) is turned ON by a forward half wave, then the capacitor C1 is charged to the forward direction through a transistor (Tr) by a primary current flowing through a resistor R2. If this value reaches a specified value, the Tr is turned OFF, and voltage is applied to the gate of a control rectifier SCR through resistors R1, R4 to flow a conduction current in the rectifier SCR, turn OFF the TrC and obtain high voltage in an ignition coil. At high speed, impedance of a capacitor C2 is decreased to apply duplicated voltage to the gate of the SCR through a resistor R3 and the capacitor C2 and advance ignition timing. In this way, at high speed, the timing is substantially advanced to obtain an ignition device eliminating the ing the necessity for ignition timing adjustment. |
