Spark Plug Integrated Fiber Optic Sensor System for Internal Combustion Engine Monitoring and Control

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: N/A
Agency Tracking Number: 26730
Amount: $99,936.00
Phase: Phase I
Program: SBIR
Awards Year: 1994
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
3916 Trade Center Drive, Ann Arbor, MI, 48108
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Marek Wlodarczyk
 (313) 971-9712
Business Contact
Phone: () -
Research Institution
N/A
Abstract
This research addresses critical needs in the areas of electronic control and monitoring of internal combustion engines that require low-cost, durable, accurate, high-temperature viable, and small-size fiber optic pressure sensors for real-time in-cylinder combustion pressure measurement. By employing a novel tapered optical fiber-based sensor design to significantly improve signal modulation levels and by using triple-wavelength0based measurement of optical thin-film interference coating spectral modulations for integrated temperature sensing, we seek to demonstrate a spark plug-integrated and temperature-compensated combustion pressure sensor system that exhibits accuracies better than 2% and operating temperatures up to 550oC. This research addresses high-temperature durability requirements by combining a reliable metal-diaphragm-based design with a hermetically sealed sensor construction. We week to significantly reduce costs of optoelectronic transceivers by developing a low-cost, tapered optical fiber bundle-based coupler design. This approach enables use of low-cost light sources, and alleviates critical alignment requirements. These critical issues have previously hampered fiber optic sensor applications in automotive industry. The multi-wavelength approach compensates for errors induced by factors encountered in an engine setting, such as vibrations, accelerations, and wide ambient temperatures. In Phase I of this research, feasibility of such sensor systems will be demonstrated. Anticipated Benefits: This project will culminate in the development of a low-cost, spark-plug integrated, accurate, durable, error- and temperature-compensated combustion pressure sensor system for internal combustion engine monitoring and closed-loop control applications. The close-loop engine controls based on the in-cylinder pressure information can lead to improved efficiency for fuel saving and pollution reduction, improved reliability, and enormous economical benefits.

* Information listed above is at the time of submission. *

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