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Automotive Sensors by John Turner

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CHAPTER 7

DISPLACEMENT AND POSITION SENSORS

Jonathan Swingler

1. INTRODUCTION

Displacement and position sensors are probably the most widely used type in automotive engineering [1,2]. They are used to monitor a large range of parameters, including the indication of an open door, the level of fluids such as fuel, the spatial position or velocity of suspension system components, and the speed of rotating components.

Probably the first displacement sensor to be fitted to a motor vehicle was the dashboard-mounted gas gauge, which first appeared in the 1920s [3]. This consisted of a voltmeter controlled by the signal generated from a float-and-arm arrangement in the gas tank. The arm moved the wiper of a wire-wound potentiometer to generate a signal ...

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