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An acceleration sensor that generates an output voltage proportional to acceleration has been developed. We invented a new, high sensitivity, differential transformer with an efficient magnetic circuit through analysis of the magnetic field in the sensor. This differential transformer design provides sensitivity approximately eleven times greater than that of conventional differential transformer designs, resulting in excellent frequency and sensitivity characteristics which are trade offs. The 4WD Anti-lock Brake System (ABS) which was developed using this acceleration sensor, exhibited greatly improved performance on ice-covered roads.

As the social aaareness of the need for greater automobile safety has risen, autonolive parts manufacturers have focused a lot of new research and development to aulomotive brake systems. Aith the much rapid advances and steady cost reductions in microelectronics technology, highly reliable, electronically controlled lour-thee1 antilock brake systems (ABS) are beginning to gain broad acceptance. Horever, wide acceptance of ABS depends upon the system and having superior performance, and high reliability at an affordable price. The toothed wheels (sensor rings) used for measuring the wheel velocity in the ABS require high precision in the pitch error of the teeth and specific magnetic properties in order to accurately detect wheel velocity, which is the first signal for brake control. Moreover, as these sensor rings are located close to the wheel, they require increased corrosion resistance ability higher than any other automotive parts.