Automotive Electronic Systems by Trevor Mellard

Automotive Electronic Systems by Trevor Mellard

By Trevor Mellard

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The operating pressure (atmospheric and/or partial vacuum in the inlet manifold) is controlled by solenoid operated valve(s) which regulate the pressure difference either side of the diaphragm, so producing a linear movement. 9 outlines the operating principles of a typical electro-pneumatic actuator. Generator electronic systems The satisfactory performance of a vehicle's electrical and electronic components depends to a certain extent on a reliable and constantly available supply of power. It is the task of the generator and its associated control electronics to provide the on-board electrical power to supply loads and for storage in the battery.

65 ohm) also prevents overheating and provides thermal adjustment. From cold the resistance is low, therefore the primary current and secondary voltage is high. During idling the resistor heats up, resistance increases and the primary current is reduced. At high engine speeds, the amount of time the pri­ mary circuit is closed is very short, so heating of the resistor is limited and the primary current remains high. 3 Basic electronic ignition system - without contact breaker points the ballast resistor is by-passed, in order to com­ pensate for the voltage drop when the high starting current is drawn from the battery and thus provide the best conditions for starting.

15,000 to 30,000 volts. The high secondary voltage is sufficient to force a current to flow through the air gap between the spark plug electrodes, in the form of a spark. 2 Illustrating the Kettering ignition system (a) Inductive energy is stored as a magnetic field, set-up by the current flowing in the primary winding when the contact breaker points are closed (b) Primary current is cut-off as the points are opened and so the magnetic field breaks down, returning the energy stored to the primary winding as a high induced voltage.

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