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With the rapid improvement of the computer control system, the fault-tolerant computer control technology has been applied into many fields. Based on this actual background, the fault-tolerant technology of embedded computer control system is studied in this study, to improve the reliability of present computer system and guarantee the stability of system operation. To find out main system faults, the structure of computer fault-tolerance control system is presented at first, based on which the principal method to achieve the fault tolerance control system is derived. Finally, three principal redundancy methods to achieve the fault tolerance control system are provided, which can be helpful to improving the reliability and stability of the computer system operation Introduction With the rapid improvement of the computer control system, the fault-tolerant computer control technology has been applied into many fields such as space navigation, aviation, process control, engineering design, management, military and so on, which is expected to reduce the possibility of security incidents caused by the computer system failure and improve the reliability of the embedded computer control system [1]. As a result, it is necessary to study the embbed computer control system thoroughly, to find out the most frequent errors and develop pertinent measures [2]. This study on the fault-tolerant technology of embedded computer control system is helpful to improve the reliability of present computer systemn and guarantee the stability of system operation. In general, the system containing programmable computer controller is called the embbed computer system, which has been widely used in many fields. Based on the relevant data provided by Tanaka Y [3], the embedded computer systema are applied into nearly 99.9% of annual production of CPU (Central Processing Unit). However, there are some softwares implaned into the ROM (Read Only Memory) of the embbed computer systems before coming into service, which makes the hardwares and softwars of different computer products have great differecne [4]. As a result, the embbed computer softwares are usually difficult to modify. Based on this consideration, the falut-tolerant stategy is adopted to improve the flexibility of the embedded computer control system, whihc can be helpful to developing efficient measures according to different faults and errors, to make the computer systems operate more stabaly and safely [5]. Embedded computer control system fault-tolerant design includes all kinds of methods that can reduce the effect of system faults, including fault detect and diagnose (FDD), dependable hardware technique, dependable software technique and so on [6]. The control system operation needs correct sensor data, while the incorrect data are usually caused by some disturbances or sensor faults. As a result, the fault-tolerant softwares are extremely important to implement the computer control system with high reliability, based on which a series of method can be applied to avoid system disturbances and implement fault tolerance, such as instruction redudancy, software redudancy, software trap, software watch timer dog and so on [7]. On the basis of module technique, the embedded software reconfiguration can be achieved easily, including recovery block, N-version and software injection and so on. As usual, the validity of the fault tolerance needs to be verified, and a method of injecting software and hardware errors to verify the power control system fault tolerance was presented by 2017 International Conference on Computing, Communications and Automation(I3CA 2017) Copyright © (2017) Francis Academic Press , UK 138 Goswami D et.al. [8]. In the study, the fault analysis tree needs to be built at first, then the fault mode is analyzed to produce all faults generated by simulators and emulators to verify the fault-tolerance. In this study, the structure of computer fault-tolerance control system is presented at first, based on which various types of system faults are analyzed. Secondly, the principal method to achieve the fault tolerance control system is provided, which is based on the concept of redundancy. The proposed redundancy methods can be combined with the practical computer control system structure to improve the reliability and stability of the computer system operation. Computer Control System Structure The computer control system structure is the basis to analyze the types if common systematic faults, which can be divided into two parts: hardware composition and software composition. Hardware Composition. The computer hardware composition block diagram is shown in Fig.1, which mainly contains five components: control hostcmputer, peripheral equipments, input and output channel, interface circuit and operating platform [9].

Research on Fault-Tolerant Technology of Embedded Computer Control System