Automotive sensors are used for controlling almost every aspect of driving performance - fuel efficiency, emission control, braking and suspensions, etc. The world demand for automotive sensors has been predicted to grow annually at approximately 10-15% with perhaps the largest growth rate indicated for engine control sensors in order to meet emission regulations. The substantial recent developments in semiconductor technology allow many applications of microcomputers in nearly all fields and a variety of microcomputers have been also introduced to automotive equipment. However, there is still incompatibility among electronics, sensor, and automotive technologies, probably owing to the differences in the environment in which each technology has been developed. Automotive systems require sensors which are low cost, rugged, and reliable, whereas electronic devices are appreciated for their precision and efficiency under limited range of environmental conditions. The present objective is to establish more rational and reliable control systems by combining these three differing technologies and extracting the best features from them. The highest growth area is in the development of efficient exhaust emission control systems being driven primarily by new emission regulations. Ceramic sensors, because of their well-known stability, find wide application in automotive sensor technology. The discussion of automotive sensors in this article will therefore focus on this field.


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