Non-Intrusive Piston Position Measurement System Using Magnetic Field Measurements
Non-Intrusive Piston Position Measurement System Using Magnetic Field Measurements
复制标题
使用磁场测量的非侵入式活塞位置测量系统
DOI：
10.1109/jsen.2013.2259811
复制
发表时间：
2013
影响因子：
4.3
通讯作者：
Zongxuan Sun
中科院分区：
文献类型：
--
作者：
Saber Taghvaeeyan;R. Rajamani;Zongxuan Sun
本文提出了一种新颖的传感系统，用于非侵入式实时测量气缸内的活塞位置。所提出的传感器利用了这样的原理：任何铁磁物体都具有固有磁场，该磁场随着物体周围位置的函数而变化。通过将磁场建模为位置的函数并使用传感器测量磁场强度，可以估计物体的位置。该原理用于测量自由活塞发动机中的活塞位置，而不需要发动机气缸内的任何传感器。将活塞近似为矩形金属物体，并对其周围磁场的变化进行建模。一个挑战是，模型的参数因发动机而异，并且针对每个发动机进行校准很麻烦。通过利用两个磁场传感器来解决这一挑战，两个磁场传感器之间的纵向间距已知。人们提出了多种估计方法来实时识别和更新磁场参数，而不需要额外的线性可变差动变压器（LVDT）传感器进行校准。比较了这些估计方法的优点和性能。自由活塞发动机装置的实验结果表明，所提出的传感器可以提供 0.4 毫米的位置估计精度。所提出的传感概念可用于多缸 SI 和柴油发动机、液压缸、气动缸以及许多其他位置测量应用中的活塞位置测量。
This paper proposes a novel sensing system 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. Through 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 the 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 vary from engine to engine and are cumbersome to calibrate for each engine. This challenge is addressed by utilizing two magnetic field sensors with known longitudinal separation between them. A number of estimation methods are proposed that identify and update magnetic field parameters in real time without requiring an additional linear variable differential transformer (LVDT) sensor for calibration. The advantages and performance of these estimation methods are compared. Experimental results from a free piston engine setup show that the proposed sensor can provide 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, pneumatic cylinders, and in many other position measurement applications.
影响因子：
4
作者：
Albon, C.;Weddemann, A.;Huetten, A.
通讯作者：
Huetten, A.