In the conventional automobiles, for the ignition timing control, two mechanical mechanisms, such as the centrifugal advance mechanism and the vacuum advance mechanism were employed. However, it is known that these mechanisms have some constraints which generate compromises from optimum timing due to the inherent disadvantages of the mechanical mechanisms.
Recently, the advances in semiconductor technology have enabled the microprocessor technique to be used in the engine ignition timing control for the automobiles.
In this thesis, an engine ignition timing controller using an 8-bit microprocessor Z-80 is designed and implemented for automobiles. Specifically, this system consists of the digital random logic circuits, Cromemco Single Card Computer, analog to digital converter, pressure sensor, engine speed sensor, and a few analog circuits. This system does not have the breaker points in the distributor which are disadvantages in the conventional systems.
The microcomputer used in this system is not for automobile purpose but general purpose. This system can be further developed by developing the microcomputer suitable for automobile purpose, and more study about the engine, the combustion efficiency, and the emission gas composition.