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Recently, there is a need for new applications of pressure sensor, such as direct fuel injection systems for protecting the environment, or power assisted brake systems for improved driving safety. For these widening areas of application, pressure sensors with higher accuracy, a wider pressure-sensing range, and integration of sensor chip functions are required. This paper discusses our development of automotive semiconductor pressure sensors.

The recent progress of electronic control systems in vehicles is remarkable as evidenced by the development of electronic fuel injection systems,(EFI), automatic transmission control systems, and anti-lock brake systems,(ABS). The number of actuators for the systems has been increasing. Consequently, a need has been identified for a reduction in volume and number of the system actuators for control purposes. A composite magnetic material has been developed with the aim of miniaturizing magnetic solenoid valves for actuator applications. A composite magnetic material is such that both ferromagnetic and paramagnetic sections coexist within a single material, and can contribute to optimization of the magnetic circuit of a solenoid valve. This paper describes the development of a composite magnetic material, and its resultant characteristics.