NDLI: Model-based estimation of cylinder pressure sensor offset using least-squares methods

Content Provider	IEEE Xplore Digital Library
Author	Tunestal, P. Hedrick, J.K. Johansson, R.
Copyright Year	2001
Description	Author affiliation: Lund Inst. of Technol., Sweden (Tunestal, P.)
Abstract	Two methods for estimating the sensor offset of a cylinder pressure transducer are developed. Both methods fit the pressure data during pre-combustion compression to a polytropic curve. The first method assumes a known polytropic exponent, and the other estimates the polytropic exponent. The first method results in a linear least-squares problem, and the second method results in a nonlinear least-squares problem. The nonlinear least-squares problem is solved by separating out the nonlinear dependence and solving the single-variable minimization problem. For this, a finite difference Newton method is applied. Using this method, the cost of solving the nonlinear least-squares problem is only slightly higher than solving the linear least-squares problem. Both methods show good statistical behavior. Estimation error variances are inversely proportional to the number of pressure samples used for the estimation. The method is computationally inexpensive, and well suited for real-time control applications.
Sponsorship	IEEE Control Syst. Soc
Starting Page	3740
Ending Page	3745
File Size	302780
Page Count	6
File Format	PDF
ISBN	0780370619
DOI	10.1109/CDC.2001.980445
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-12-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Piezoelectric transducers Pressure measurement Engine cylinders Optical amplifiers Thermal stresses Optical feedback Optical sensors Optical fiber filters Distortion measurement Optical distortion
Content Type	Text
Resource Type	Article

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