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Design of Vessel Structure Safety Monitoring System Based on CAN Bus

Author: YangChaoLong
Tutor: XuWenBo
School: Jiangnan University
Course: Computer Applications
Keywords: The structure of the ship safety monitoring system CAN bus CAN driver Embedded systems Windows CE.NET Data Acquisition
CLC: TP274.4
Type: Master's thesis
Year: 2006
Downloads: 207
Quote: 1
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Abstract


The structure of the ship safety monitoring system for real-time monitoring and alarm and structure of the ship security assessment shipping in the structure of the ship strain. Comparative analysis of the RS-485 bus and CAN bus technology based on the advantages and disadvantages of general-purpose operating system and embedded operating system features, this paper presents a CAN bus and embedded operating system Windows CE combination The structure of the ship monitoring system implementation. The implementation of this program consists of three parts. The first part is based on CAN bus data acquisition module design, responsible for the strain data collection and upload. This part deals with the hardware and software design of data acquisition module. In hardware design, This selection of SST89C54 microcontroller, independent CAN controller SJA1000, AD converter AD679 set up data acquisition module is the core of the interface circuit between the main chip, hardware anti-jamming processing were described in detail; in module software design, the detailed description of the data acquisition module initialization, the data transceiver main function modules of the program flow. In addition, the article discusses several factors affecting the strain measurement accuracy, using software correction method for strain measurement nonlinear problems, strain resistance of the three-wire connection technology and four-wire bridge excitation detection technology to improve the measurement accuracy; embedded operating system Windows CE.NET-based host system design, this section is divided into embedded system kernel customization, the stream interface CAN adapter driver design, application system design. The the Windows CE.NET system function cutting, custom custom embedded system kernel, hardware resources and application requirements; stream interface driver CAN adapter design, analysis of of Windows CE.NET the interrupt processing, describes the CAN interrupt service thread (IST) program flow of packets sent and received, the article discusses the CAN driver of a received message responsive, and gives a solution for real-time response, the approach based on the real-time response requirements and transmission rate is set to receive buffer queue size and receive buffer queue packets received by the number of critical, in order to meet real-time requirements of a received message; application system design, to the modular design concept of the application system the main flow, the system self-test, parameter setting and modified zero balance data measurement function modules of the program flow design. The third part is the custom of the communication protocol. According to the master-slave control features of the system, this paper establishes a master-slave communication mechanism between the host and the acquisition module. The host acquisition module and channel parameter settings for the query, sampling and data transmission control.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system > Centralized testing and roving detection system
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