Automotive Electronic Systems by Trevor Mellard

By Trevor Mellard

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The relationship between on-time and off-time is decisive with regard to the magnitude of the resulting mean excitation current Im. The excitation current rises along curve a and decays (decay current iA) along curve b. The graph is intended to convey a general impression only. The values shown are not in accordance with actual values. 12 Electronic voltage regulator. Circuit diagram field excitation current on and off while the Zener diode is used for controlling the transistors by acting as a voltage sensitive switch.

A spark can arc from one electrode to the other only when a sufficiently high voltage is present to make the gap between the electrodes become electrically conductive. Under the high cylinder pressure conditions of a typical IC petrol engine the ignition voltage may need to be as high as 5 K to 20 KV, depending upon the type of engine and spark plug. There is also the need for the voltage at the plug electrodes to increase rapidly from zero until the spark discharge voltage is reached and for the spark voltage to be maintained for a suitable duration to ensure that the air-fuel mixture can wholly ignite.

7 reaches the base of transistor TY via resistor R2, and diodes D 2 and D 3 , switching Tj on which, in turn holds transistor T 2 off. The output voltage of the pulse shaper circuit is therefore high. The positive part of the signal pulse is blocked by diode D4, so transistor T{ (and the rest of the circuit) is unaffected. The negative part of the signal pulse, however, reduces the base voltage of transistor Ύγ. 7V) the tran­ sistor turns off, turning transistor T 2 on and the output voltage goes low.

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Categories: Electrical Electronics