A fast, accurate and safe clock synchronization method and system

Abstract

The invention relates to a rapid, accurate and safe clock synchronization method. The method comprises that a clock channel to join starts clock synchronization in the joining process; and a main clock channel is synchronized with auxiliary clock channels in the operation process. When the clock channel to join is started, clock synchronization request information is sent to the main clock channel, and the main clock channel replies the clock channel to join with clock operation information of the main clock channel itself; the clock channel to joint obtains current clock information and needed waiting time by calculation, and formally joints after the waiting time; and during operation of the multiple clock channels, one channel serves as the main clock channel, and other channels serve as the auxiliary clock channels, and synchronize with the main clock channel once in each task period. Compared with the prior art, the method and system have the advantages of being rapid, accurate and safe.

Description

technical field [0001] The invention relates to a clock synchronization method, in particular to a fast, accurate and safe clock synchronization method and system. Background technique [0002] Safety computers are usually widely used in domestic and foreign railways and urban rail transit fields; they usually adopt a redundant structure of two out of three or two out of two, each module backs up each other, runs the same task, and compares and votes on the output results , so as to achieve fault detection and fault tolerance, and improve the security and reliability of the system. [0003] An important function of the redundant structure is clock synchronization, otherwise the same input cannot be obtained at the same time for logic operations and consistency voting; Smooth external work, thereby affecting the overall system availability. Once the clocks are synchronized, multiple channels can execute periodic logic tasks at the same pace. [0004] At present, clock sync...

AI Technical Summary

Problems solved by technology

Hardware synchronization generally adopts common clock technology or independent clock synchronization technology; there is a problem of common mode failure when using a common clock, and the system cannot tolerate the failure of the common clock; hardware independent clocks put forward higher-level requirements for the consistency of the overall hardware parameters of the system. In particular, the current CPU clock frequency and chip integration are constantly improving, making it difficult to implement.

The clock synchronization algorithm implemented by general software, data transmission, response time and logical operation overhead are relatively large, and the synchronization accuracy is not high

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