A MICROCOMPUTER ENGINE CONTROL SYSTEM USING NEWLY-DESIGNED LSI'S

A microcomputer controlled engine management system has been developed by using new sensors, semiconductor devices and architecture. This system is suitable for middle size or small size cars because of its small and inexpensive component devices, such as functional electronic sensors and semiconductor integrated circuits. One of the electronic sensors is a hot-wire air-mass flowmeter. The key large scale integrated circuit is an input/output signal control LSI which includes a high speed and high resolution analog to digital converter and several signal modulators for engine control systems. A unique processing procedure for controlling the quantity of intake air-mass has been developed. The electronic circuits for this purpose have also been fabricated on this interface LSI. This microcomputer system is especially suitable for multi-functional integrated engine control systems, but it can also be applied to some simplified systems aiming to control an individual function, such as electronic carburetion, fuel injection, and spark timing controls.