Dynamic Detection on Airflow for Vehicle Intake System Based-on Hot-Film Anemometry Sensors
- 1
- 2
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.
- S. Kim, T. Nam and S. Park, “Measurement of Flow Direction and Velocity Using a Micromachined Flow,” Sensors and Ac-tuators A, Vol. 114, No. 2-3, 2004, pp. 312-318. doi:10.1016/j.sna.2003.12.019
- L. Qiu, S. Hein, E. Ober-meier and A. Schubert, “Micro Gas-Flow Sensor with Integrated Heat Sink and Flow Guide,” Sensors and Actuators A, Vol. 54, No. 1, 1996, pp. 547-551. doi:10.1016/S0924-4247(97)80012-X
- F. Mailly, A. Giani, R. Bonnot, P. Temple-Boyer, F. Pascal-Delannoy, A. Foucaran abd A. Boyer, “Anemometer with Hot Platinum Thin Film,” Sensors and Actuators A, Vol. 94, No. 1-2, 2001, pp. 32-38. doi:10.1016/ S0924-4247(01)00668-9
- T. Neda, K. Nak-mura and T. Takumi, “A Polysilicon Flow Sensor for Gas Flow Meters,” Sensors and Actuators A, Vol. 54, No. 1, 1996, pp. 626-631. doi:10.1016/ S0924-4247(97)80027-1
- K. A. Makinwa and J. H Huijsing, “A Wind-Sensor Interface Using Thermal Sigma Delta Modulation Techniques,” Sensors and Actuator A, Vol. 92, No. 1-3, 2001, pp. 280-285. doi:10.1016/S0924-4247(01)00584-2
- P. Bruschi, A. Di-ligenti, D. Navarrin and M. Pioto, “A Double Heater Integrated Gas Flow Sensor with Thermal Feedback,” Sensors and Actu-ators A, Vol. 123-124, pp. 2005, pp. 210-215.
- C. Tropea, A. L. Yarin and J. F. Foss, “Springer Handbook of Experimen-tal Fluid Mechanics,” Springer, Berlin, 2007. doi:10.1007/978-3-540-30299-5
- R. Adamec, D. V. Thiel and P. Tanner, “MEMS Wind Direction Detection: From Design to Operation,” Proceedings of 2nd IEEE Sensors Conference, Toronto, 22- 24 October 2003, pp. 340-343.
- K. A. A. Makinwa and J. H. Huijsing, “Constant Power Operation of a Two-Dimensional Flow Sensor Using a Thermal Sigma–Delta Modulation Technique,” Proceedings of 18th IEEE Instrumentation and Measurement Technology Conference, Budapest, 21-23 May 2001, pp. 1577-1580.