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A new oil pressure sensor has been developed utilizing iron base amorphous magnetic alloys. The sensor was composed of a cylindrical body with oil inlet, the amorphous magnetic alloy strip glued around the body and coils arranged to the alloy. The output behavior of the sensor was explained successfully by applying a rotation magnetization model. The characteristics of the developed sensor were as follows. Measurable pressure range; 0 to 20MPa. Operating temperature range; -30 to 100°C Inaccuracy; less than 2 %F.S. (F.S. means full scale) The durability tests like cyclic heating or pressure application demonstrated that the developed sensor is durable enough for automobile use.

This paper describes the development process for acceleration sensors used on automobiles and acceleration evaluation system especially for the acceleration in super low range frequency. Acceleration sensor is indispensable not only for good vehicle motion control system, for example, active suspension control system, antiskid control system and four wheel steering control system, but also for safety system like air bag control system. This work focused on the development process of acceleration sensor which applied piezo ceramics. Features of newly developed sensor are as follows. 1) Achievement of self-diagnostic function to detect sensor failure utilizing the characteristics of piezo ceramics 2) Addition of piezo ceramic to cancel the pyro-effect achieved stabilization of sensor characteristics and enabled to detect acceleration of 0.0025G in super low range frequency of 0.05Hz. 3) Incorporates impedance conversion, filtering and temperature characteristics compensation circuitry.