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Dynamic Detection on Airflow for Vehicle Intake System Based-on Hot-Film Anemometry Sensors

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Author(s): Rong-Hua Ma | Tsung-Sheng Sheu

Journal: Journal of Transportation Technologies
ISSN 2160-0473

Volume: 01;
Issue: 01;
Start page: 1;
Date: 2011;
Original page

Keywords: Vehicle Intake System | Detection | Anemometry | MEMS

ABSTRACT
The goal of this study is to develop an airflow meter sensor for vehicle intake system detection in internal combustion engines. The study uses micro-electromechanical process technology to develop a hot-film flow meter with an alumina substrate and platinum film heater; the hotline method is used to create a micro airflow anemometry meter sensor relying on variations in resistance of the platinum film corresponding to different wind velocity at the set temperatures. The micro-sensor is less bulky and simpler structure than ordinary meters, and its small size enables it to provide good sensitivity and measurement precision. The alumina plate used in this study is produced by polishing an alumina substrate, a platinum film is then deposited on the plate to complete the micro-heater used in the sensor. Resistance on the sensor side varies as gas flows through the sensor, and the instrument determines airflow velocity on the basis of the changes in resistance caused by gas flow differences. Airflow velocity form 10 m/s to 60 m/s are used to test. Resistance displays a regular slope, indicating the relationship between airflow velocities varies remain predictable throughout the sensing range. Therefore, the sensor can achieve its airflow measurement purpose completely.

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