A real-time data storage method

Abstract

A real-time data storage method is used for data storage of a motor drive control system. The real-time data storage method opens up a data buffer area in the on-chip RAM of the micro control unit. According to the speed of data updating, the data are first buffered in the on-chip RAM of the micro-control unit, and the data of the set time length are buffered in real time. The running state and the running parameters of the monitored electric drive control system are recorded in the way of trigger storage. When the triggering condition is satisfied, the micro-control unit automatically storesthe data cached in the RAM into the off-chip memory chip through the data bus. The data transfer between the RAM and the off-chip memory chip takes place only once when the trigger condition is satisfied. The invention solves the problem that the on-chip data generation rate of the micro-control unit and the off-chip storage rate are not matched in the motor driving control system and realizes thehigh real-time storage of the data without affecting the process of the micro-control unit, and the storage interval can be set to the order of microseconds at the shortest.

Description

technical field [0001] The invention relates to a data real-time storage method. Background technique [0002] In the electric drive control system, especially the motor drive system, it is necessary to know the working state of the motor by monitoring the parameters fed back by the motor in real time. In some special environments, the motor is too far away from the operator or is in a closed state. If the system fails at this time, the operator cannot observe the condition of the motor in real time, and can only restore the situation before the failure through the feedback data. [0003] In order to record the operating status and parameters of the electric drive control system, the current common method is to store the data in a separate storage device, mostly in the form of a memory chip, SD card or storage disk, where the storage disk and SD card The form will increase other related equipment, increase costs and cause the system to be cumbersome. In the motor control s...

AI Technical Summary

Problems solved by technology

In some special environments, the motor is too far away from the operator or is in a closed state. If the system fails at this time, the operator cannot observe the status of the motor in real time, and can only restore the situation before the fault through the feedback data

[0003] In order to record the operating status and parameters of the electric drive control system, the current common method is to store the data in a separate storage device, mostly in the form of a memory chip, SD card or storage disk, where the storage disk and SD card The form will increase other related equipment, increase costs and cause the system to be cumbersome

In the motor control system, the electrical parameter data that needs to be observed is usually stored in the external memory chip continuously, so that the permanent storage of the data can be realized without adding additional equipment, but there are also problems: first, due to the micro The communication rate between the control unit (MCU, Microcontroller Unit) and peripherals is limited. In order to ensure that the last data storage action has been completed before the next data storage is initiated, the method of increasing the data storage interval is generally adopted, which greatly affects The real-time performance of the data is guaranteed, and the density of the feedback data directly affects the accuracy of restoring the state before the fault; secondly, if the data storage interval is forcibly shortened and the communication frequency between the micro-control unit and the peripheral equipment is increased, the frequent communication will take up A large number of operating resources of the micro control unit affect the process of the micro control unit, resulting in the failure of the electric drive control system to operate normally

In the motor drive control system, the update frequency of electrical parameters is directly related to the interruption frequency of the electrical system control program. Usually, the update frequency of electrical parameters is not higher than the interruption frequency of the electrical system control program, which can reach tens of KHZ. However, the communication rate between the microcontroller unit and the peripherals is limited and cannot reach such a high frequency

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