Fiber optics-based cylinder pressure sensors for advanced engine controls

• Autorzy: Wlodarczyk L.
• Języki publikacji: EN

Abstrakty

EN

This paper presents the design, applications, and performance of the miniature fiber optic-based cylinder pressure sensor which has targeted advanced engine controls requiring high accuracy pressure information. Three types of sensor packages are described currently utilized in prototype closed loop control systems for diesel, gasoline, and dual fuel engines: glow plug with the heater-mounted sensor, spark plug with removable sensor, and a stand alone package. All these packages are based on the 1.7 mm diameter sensor which has been validated in various combustion engines over the last ten years. This robust low cost sensor operates on the principle of light intensity changes due varying reflection from a flexing metal diaphragm, monitored by twooptical fibres. The sensor is compensated for all major temperature errors encountered in internal combustion engines. (1) The auto-referencing technique maintains sensor calibration compensating for temperature effects on the sensor signal conditioner over the range of –40oC to +150oC. (2) In a reliable design the sensor head materials and dimensions are optimized to compensate for the mid-term thermal errors associated with engine load changes over a temperature range of –40oC and 380oC, resulting in the thermal coefficient of sensitivity as low as 0.005%/oC. (3) Due to minimal heat flux associated with the sensor’s small diameter the thermal shock error is minimized such that the total accuracy is typically in the range of 1- 2%, dependent on sensor package and application. Close to a hundred glow plug-integrated sensors have been used in on-road tests over several hundreds of hours without sensor performance degradation or soot fouling. Tens of spark plug mounted sensors have been utilized to control engine knocking in aircraft engines fueled by automotive gasoline. Finally, several tens of stand alone sensors have been used to control heavily knocking diesel-natural gas engines operating in the Homogenous Charge Compression Ignited mode.

Słowa kluczowe

EN

fiber optic-based cylinder pressure sensor; advanced engine controls

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2005
• Tom: Vol. 12, No. 1-2
• Strony: 329--338
• Opis fizyczny: Bibliogr. 7 poz.,rys.

Twórcy

autor

Wlodarczyk L.

• Optrand, Inc. 46155 Five Mile Rd. Plymouth, MI 48170, USA tel.: [phone] fax: [phone],

Bibliografia

• [1] M. Sellnau, F. A. Matekunas, P. A. Battiston, C.-F. Chang, and D. R. Lancaster, “Cylinder-Pressure-Based Engine Control Using Pressure-Ratio-Management and Low-Cost Non-Intrusive Cylinder Pressure Sensors,” SAE Paper No. 2000-01-0932, 2000.
• [2] U.S. Patent No. 5878717, Cylinder pressure based air-fuel ratio and engine control.
• [3] A. K. Oppenheim, “Paving the Way to Controlled Combustion Engines (CCE),” SAE paper no. 951961, presented at the 1995 SAE International Congress and Exposition, Detroit, MI, March, 1993.
• [4] H. Huelser, K. Neunteufl, E. Unger, and B. Breitegger, Cylinder-pressure-based Engine Control for Diesele Engines”, 5th IAV Symposium, 9-10 June 2005, Berlin, 2005.
• [5] J. Jeschke, "Conception and test of a cylinder pressure based engine management for passenger car diesel engines" Ph.D. Dissertation, University of Magdeburg, Germany, 2003.
• [6] T. Poorman, Liangdao Xia, M. T. Wlodarczyk, “Ignition System-Embedded Fiber-Optic Combustion Pressure Sensor for Automotive Engine Control and Monitoring,” SAE Paper No. 970853, 1997.
• [7] O. Ulrich, R. Wlodarczyk and M. T. Wlodarczyk, “High-Accuracy Low-Cost Cylinder Pressure Sensor for Advanced Engine Controls,” SAE paper No. 2001-01-0991. 2001.