Time Calibration Method for Host Software of Safe Computer Platform of Urban Rail Transit Signaling System
An urban rail transit and safety computer technology, applied in the field of rail transit, can solve the problems of limited timing accuracy, fluctuation of two-by-two calibration accuracy, and unstable transmission delay, so as to improve timing accuracy, improve accuracy, and reduce software The effect of consumption
Active Publication Date: 2020-06-26
TRAFFIC CONTROL TECH CO LTD
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Problems solved by technology
In the prior art, the two channels of the two-out two-time calibration are communicated through high-speed SPI serial communication. Due to the transmission delay in the serial communication mode, the accuracy of the time calibration is objectively limited, and the software processing time and the timing of the calibration are added. The resulting timing error can no longer meet the high-precision synchronization requirements of the two machines, affecting system availability
The existing two-by-two time calibration communicates through the Ethernet bus. Since the Ethernet bus is not real-time transmission, and the transmission delay is not fixed, time compensation cannot be performed, resulting in fluctuations in the accuracy of the two-by-two time calibration
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[0012] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0013] figure 2 It is a schematic flow diagram of the method for correcting the time of the host computer software of the urban rail transit signal system security computer platform in an embodiment of the present invention, as figure 2 As shown, the embodiment of the present invention provides a method for checking the time of the mainframe so...
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The embodiment of the invention provides a city rail transit signal system security computer platform host software time-calibration method. The method includes: respectively adopting a mode of hardware interruption to carry out 2-vote-2-time-calibration between two microcontrollers of A1 and A2 and two microcontrollers of B1 and B2 respectively corresponding to a first motherboard A and a secondmotherboard B; and respectively adopting a network bus with fixed network delay time to carry out double-2-time-calibration between the two pairs of microcontrollers of A1 and B1 and A2 and B2 corresponding to the first motherboard A and the second motherboard B. According to the time-calibration method provided by the embodiment of the invention, time-calibration is carried out through a manner of 2-vote-2-hardware-interruption, time-calibration accuracy is improved, and software consumption is alleviated; and double-2-system-time-calibration is completed through the network bus with the fixed network delay time, that is, double-2-time-calibration accuracy is improved through a manner of fixed time compensation, and the time-calibration accuracy is significantly improved on the basis of adouble-2-vote-2-secure-computer platform architecture.
Description
technical field [0001] The embodiment of the present invention relates to the technical field of rail transit, in particular to a method for correcting the time of a host computer software on a safe computer platform of an urban rail transit signaling system. Background technique [0002] The urban rail transit signaling system widely adopts the two-by-two secure computer platform architecture. [0003] figure 1 It is the structure diagram of the prior art two by two security computer platform, such as figure 1 As shown, taking the vehicle-mounted signal equipment as an example, a 2-out-2 board is placed at the head end (main board A) and tail end (main board B), and the 2-out 2 boards at both ends are hung on the vehicle redundant bus. Two out of two boards at both ends constitute a two by two out of two safe computer platform. In the prior art, the two channels of the two-out two-time calibration are communicated through the high-speed SPI serial communication mode. Due...
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IPC IPC(8): H04J3/06H04L12/40
CPCH04J3/0658H04J3/0682H04L12/40189H04L2012/40293
Inventor 王伟张建明
Owner TRAFFIC CONTROL TECH CO LTD