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CAN signal sending algorithm based on time slice distribution

A technology of signal transmission and time slice, applied in the direction of data exchange, digital transmission system, electrical components, etc. through path configuration, it can solve the problems of large load rate, inaccurate transmission time, inaccurate transmission period, etc., and achieve small load fluctuation. , the effect of low operating system requirements and simple algorithm

Pending Publication Date: 2019-11-29
YANFENG VISTEON ELECTRONICS TECH NANJING
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Problems solved by technology

[0006] Both of the above two methods have some disadvantages. There are two problems in the sending method in ①. One is that the accuracy of the sending cycle decreases rapidly when the number of sent signals increases. The load rate during the period is very large, and the load rate during the period when the signal is not sent is very small; the method in ② improves the problem of inaccurate signal transmission cycle in ①, but when the number of signals in a certain cycle is large, the transmission cycle will also become inaccurate. In addition, too many sending threads will cause the system to occupy a large amount of busy resources, which will indirectly lead to inaccurate sending time

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[0023] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer ” refer to directions towards or away from the geometric center of a particular part, respectively.

[0024] Such as Figure 1-2 According to the CAN signal transmission algorithm based on time slice allocation, in the vehicle-mounted CAN bus system, the CAN bus baud rate generally has several commonly used baud rates (125k, 250k, 500k), etc., taking the 500k baud rate as an example, The sending time of one frame of CAN signal is about 250us, this algorithm adopts the sending ...

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Abstract

The invention provides a CAN signal sending algorithm based on time slice distribution. Problems that in the prior art, in a timing sending algorithm and multi-thread sending, a load rate of a CAN busin a signal sending period is large, the load rate is small in the signal non-sending period, the number of sending threads is too large, the occupied amount of busy resources of a system is large, and sending time is inaccurate are solved, and the automobile CAN bus signal periodic sending technology which is small in resource occupation, accurate in period, small in CAN bus load fluctuation andeasy to implement Is provided.

Description

technical field [0001] The invention relates to a CAN bus signal transmission technology of an automobile instrument, in particular to a CAN signal transmission algorithm based on time slice allocation. Background technique [0002] In recent years, there are more and more CAN bus signals in automobiles, and the load rate of CAN bus is getting larger and larger. The real-time requirements for CAN signal transmission in the whole vehicle are also getting higher and higher, and the proportion of CAN signals in vehicle functions is also increasing. The larger the value, in order to accurately test the function of the instrument, the CAN signal transmission cycle must meet the requirements, and it is more and more important to have an accurate CAN signal transmission cycle algorithm. [0003] At present, the commonly used CAN signal cycle transmission and distribution are as follows: [0004] ① Timing sending algorithm: The cycle of CAN signals generally ranges from 10ms to 5s....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04L12/911
CPCH04L12/40H04L47/826H04L2012/40215H04L2012/40273
Inventor 叶晓昶
Owner YANFENG VISTEON ELECTRONICS TECH NANJING
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