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Automotive Sensors by John Turner

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CHAPTER 4

AUTOMOTIVE AIRFLOW SENSORS

John Turner

1. INTRODUCTION

The subject of flow measurement can be subdivided into vector flow, where the direction and the magnitude of flow are sensed, volume flow, and mass flow rate. In automotive engineering mass flow rate is the most important. Information on the rate at which air mass flows into an internal combustion engine is essential if the air-fuel ratio and therefore the combustion process is to be accurately controlled.

In older carburetor-type engine designs, airflow across the end of the carburetor jet was sufficient to draw fuel into the air stream and hence to supply the engine. By using jets of different diameter it is possible to adjust air-fuel ratio so that it is approximately correct ...

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