Fault Tolerance Methodology for Micro-volume Deposit System
This work presents a method and an algorithm for implementing the control of two micro-pumps with tolerance to sensors faults. These micro-pumps are used in a micro-volume deposit system, which is intended to help with biomedical and laboratory tests that
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bstract This work presents a method and an algorithm for implementing the control of two micro-pumps with tolerance to sensors faults. These micro-pumps are used in a micro-volume deposit system, which is intended to help with biomedical and laboratory tests that involve the use of medical samples. This deposit system performs the suction or deposit of the required volumes of fluid. A requirement for this system is to protect the samples and reagents used in the process for the cost associated with gathering the samples. In this way, the idea is to have a fault tolerant system, which can ensure the integrity of the samples. The method and algorithm are implemented using a technique called analytic redundancy Muenchhof et al. (Eur J Control 15, 2009 [1]), which allows reducing the number of physical redundant sensors in a system. For this implementation, we propose the use of a physical sensor and an analytic sensor, using the model of suction-expulsion of the micro-pump from a previous work. Keywords Kalman filter
FDI Fault tolerant Deposit system Micro-pump
1 Introduction Biomedical and laboratory tests involve the use of medical samples, which are typically analyzed using various reagents. A micro-volume fluid deposit system is being developed at Microsystems Research and Biodesign Center in Mexico City. L. Yépez-Pérez R. Bustamante-Bello (&) R.A. Ramírez-Mendoza Departamento de Mecatrónica, Tecnológico de Monterrey, Campus Ciudad de México, Centro de Investigación en Microsistemas y Biodiseño (CIMB), Calle del Puente 222, Tlalpan, 14380 Mexico, D.F., Mexico e-mail: [email protected] J.d.J. Lozoya-Santos Dirección de Investigación, División de extensión, consultoría e investigación, Universidad de Monterrey, Av. I. Morones Prieto 4500 Pte., Col. Jesús M. Garza, San Pedro Garza García 66238, NL, Mexico © Springer Science+Business Media Singapore 2017 A. Öchsner and H. Altenbach (eds.), Properties and Characterization of Modern Materials, Advanced Structured Materials 33, DOI 10.1007/978-981-10-1602-8_28
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This system can move along X and Y axes, has suction and expulsion functions for fluids to deposit samples or reagents. This system uses a novel distributor module powered by MEMS micro-pumps, which are small in size and consume little power. A previous work [2] shows the implementation to use the micro-pumps in an open-loop mode. As higher precision is needed, an additional sensor is being added. Test results are shown in this work with this sensor operating in the system. The main contribution of this paper is in identifying a suitable fault tolerant method to ensure the integrity of the samples. This method considers two cases: the first one, a quasi-fault tolerant method, using just one sensor and human intervention. For this method, an external operator can check if the fault is on the sensor or the actuator, and the operator can make a decision. The second method uses two sensors, and in case of a faulty sensor, an automatic switch is performed for the sensor. In b
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