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Automotive Sensors by John Turner

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CHAPTER 2

AUTOMOTIVE PRESSURE SENSORS

M. J. Tudor

S. P. Beeby

1. INTRODUCTION

Today, an average car utilizes more than fifty sensors, and a luxury car more than one hundred. Of these, one-third are currently based on micromachined sensors [1] with the proportion expected to increase in the future. Pressure sensors make up a significant proportion of this (around 15% by value) with manifold absolute pressure sensors being ubiquitous and tire and brake control pressure sensors becoming widespread.

Typical under-hood environments may involve temperatures from –40 °C to 1000 °C with thermal cycling, pressures up to 2000 bar, high humidity, salt spray, extreme shock loads, and high levels of vibration. Sensors must last for the lifetime of the car, ...

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