MVB device status word transmission method based on load balance
A device status word and load balancing technology, applied in the direction of digital transmission system, transmission system, electrical components, etc., can solve the problems of affecting the driver, the impact of equipment status judgment, and the loss of device status word, so as to optimize the network load and ensure the correctness And stability, solve the effect of instability
Active Publication Date: 2014-05-28
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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[0004] The status of the network equipment and the status of the network link displayed on the current vehicle-mounted display are all collected device status words of all devices on the network through the VCM (vehicle control module), analyze the device status words, and send the analysis results to the vehicle-mounted display In actual application, through long-term research, it is found that when the VCM module collects the device status words of each device in the network, there is a loss of the device status word (under certain conditions, the VCM module cannot obtain the device status of other devices Words), leading to the wrong display on the vehicle display, which affects the driver's judgment on the status of the equipment and affects normal operations
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[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0024] Through the research, it is found that the commonly used device status word polling adopts the device address polling of a network device forcibly added every 8 basic cycles, but in the actual use process, different application projects have different loads in each basic cycle The same, and there are situations where the load in some basic periods is low and the load in some basic periods is high. When a device status polling frame is forced to be added in the basic period, if the load in the basic period is high, then There will be increased polling frames that will cause the load to exceed 100%, resulting in polling failures. Because the number of configured ports in each cycle of each application project is different during use, there must be a difference in the bus load in each cycle, and a high load state appears in some c...
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The invention discloses an MVB device status word transmission method based on load balance. Before bus resource allocation, all cyclic loads in a whole macrocycle are calculated according to allocation of application ports, calculation results are sequenced from small to large, and roll poling of a device status word is inserted in a low-load cycle in a single cycle according to the sequencing result. The method has the advantages that the principle is simple, network loads can be optimized, and correctness and stability of device state display are guaranteed.
Description
technical field [0001] The invention mainly relates to the technical field of vehicle network control, in particular to a load balancing-based MVB device status word transmission method suitable for vehicle network control. Background technique [0002] In the TCMS system based on the MVB bus, the MVB bus communication adopts the bus periodic time-sharing control, and the transmission data type in each cycle is specified in the standard, and the process data and message data can be transmitted. All data frame transmissions on the MVB bus are implemented in the form of question and answer. The device status word also inquires the network device through the MVB bus master, and the network device sends a correct response frame after receiving the query frame. In the transmitted data, the device status word of the MVB device is applied to multiple application logics, such as the judgment of MVB master and backup master, the display of the AB line status of the bus, etc., and the...
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IPC IPC(8): H04L1/00
Inventor 周桂法杨卫峰宁侨肖家博韩露易伟民刘军
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD