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This paper reviews new engine control technologies and future trends, particularly in mechanical and electrical engine control components, the application of modern control theory, and new advances in sensor technologies. A system which utilizes engine cylinder combustion information is representative of these new trends. Like other such sensor systems, the combustion sensor still has problems which must be overcome before practical application is possible. The factors and problems involved in developing this sensor will be discussed, along with how the relationship between sensing information and engine performance can be used to improve engine performance.

An electronic engine control system that uses a microcomputer has been developed. It combines four control systems - fuel injection, ignition timing, EGR and idle speed control - utilizing the engine speed and intake air quantity for its main parameters. The control circuit is composed of an 8-bit microcomputer combining an 8k byte ROM, RAM, a custom designed input/output LSI, and two hybrid integrated circuits, one has voltage regulators and another has input/output interface circuits. The control program consists of a main program, a fail-safe program for noise protection and a check program for diagnostic functions. The main program uses interrupt techniques to control effectively the four items by one microcomputer. The interrupt requests occur from crankshaft position signal and interval timer signals.