Method for improving sampling antijamming capability of fixed period numerical control system

A digital control system and fixed-period technology, applied in the direction of digital control, electrical program control, etc., can solve problems such as increasing system complexity, achieve the effect of improving anti-interference and avoiding interference of fixed frequency

Active Publication Date: 2013-09-18
CANNY ELEVATOR
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Problems solved by technology

However, conventional numerical control theory such as differential equations, Z-transform and other mathematical tools are difficult to use this method, and this method increases the complexity of the system because the sampling period is taken as a variable.

Method used

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  • Method for improving sampling antijamming capability of fixed period numerical control system
  • Method for improving sampling antijamming capability of fixed period numerical control system

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Embodiment Construction

[0014] like figure 1 As shown, a digital control system, its control subroutine is a subroutine that runs repeatedly with a fixed cycle T generated by timer A. When the timer A’s timing interrupt time T arrives, it enters the interrupt processing program, and the program first runs the random number Generate a sub-function to generate a random number, which represents time T i (T i including T 1 ,T 2 ,T 3 ,...a series of random times), and then start a timer B, whose timing time is the time T generated by the above random number i , and then the control subroutine continues to run its control logic or control algorithm, and returns to the main program after completion to continue waiting for timer A to interrupt; at the same time, after the control subroutine starts timer B, once the timer B's timing interrupt time T i When it arrives, set the interrupt priority of the sampling subroutine higher than that of the control subroutine, and immediately enter the data sampling ...

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Abstract

The invention discloses a method for improving the sampling antijamming capability of a fixed period numerical control system. The sub control programs of a numerical control system are sub programs which are continuously and repeatedly operated in a fixed period T which is generated by a timer A; and a random number generation subfunction is firstly operated at the inlet of the control program so as to generate a random number which represents time Ti, i.e. a data sampling sub program is started after a time delay of Ti, and digital quantity or analog quantity data sampling is carried out. Consequently, the whole control period of the system is maintained unchanged, and the sampling sub program can be run in each period T without influencing an original fixed period control algorithm. Moreover, a random time Ti is introduced, and a time interval between every two samplings is not fixed, so that the interference of a plurality of fixed frequencies can be avoided, and the antijamming capability of the system is improved.

Description

technical field [0001] The invention relates to a sampling method of a digital control system, which belongs to the field of digital control systems. Background technique [0002] For any control system, the characteristics of the system are reflected in the changes of its input and output. To obtain the ideal control effect, it is necessary to correctly sample the input and output of the system, understand the operating conditions of the system, and then use appropriate control methods to make the system Under certain index functions, the control effect reaches the optimum or achieves the expected control effect. Therefore, whether the input and output data collected by the digital control system can truly reflect the system is the key to its control performance. [0003] Most of the modern digital control theories are based on certain criteria and are implemented with a fixed sampling period. However, in an actual system, the influence of the environment and interference...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/18
Inventor 黄维纲
Owner CANNY ELEVATOR
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