DocumentCode :
2909010
Title :
Novel non-intrusive sensor for piston position measurement
Author :
Taghvaeeyan, Saber ; Rajamani, Rajesh ; Zongxuan Sun
Author_Institution :
Dept. of Mech. Eng., Univ. of Minnesota, Twin Cities, Minneapolis, MN, USA
fYear :
2013
fDate :
17-19 June 2013
Firstpage :
3631
Lastpage :
3636
Abstract :
This paper proposes a novel sensor for the non-intrusive real-time measurement of piston position inside a cylinder. The proposed sensor exploits the principle that any ferromagnetic object has an inherent magnetic field which varies as a function of position around the object. By modeling the magnetic field as a function of position and using sensors to measure magnetic field intensity, the position of the object can be estimated. This principle is used to measure piston position in a free piston engine without requiring any sensors inside the engine cylinder. The piston is approximated as a rectangular metallic object and the variation of the magnetic field around it is modeled. A challenge arises from the fact that the parameters of the model would vary from engine to engine and would be cumber-some to calibrate for each engine. This challenge is addressed by utilizing two magnetic field sensors with known longitudinal separation between them. An iterated least squares algorithm then provides adaptive parameter estimates and accurate position estimation. Experimental results from a free piston engine set up show that the proposed sensor can provide better than 0.4 mm accuracy in position estimates. The proposed sensing concept can be utilized for piston position measurement in multi-cylinder SI and diesel engines, hydraulic cylinders and in many other position measurement applications.
Keywords :
diesel engines; engine cylinders; ferromagnetic materials; magnetic fields; magnetic sensors; modelling; pistons; position measurement; diesel engines; engine cylinder; ferromagnetic object; free piston engine; hydraulic cylinders; longitudinal separation; magnetic field intensity; magnetic field sensors; modeling; novel nonintrusive sensor; piston position measurement; Engines; Equations; Magnetic field measurement; Magnetic fields; Magnetic heads; Pistons; Position measurement; Position measurement; magnetic sensors; parameter estimation; piston position estimation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
American Control Conference (ACC), 2013
Conference_Location :
Washington, DC
ISSN :
0743-1619
Print_ISBN :
978-1-4799-0177-7
Type :
conf
DOI :
10.1109/ACC.2013.6580393
Filename :
6580393
Link To Document :
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