Control system for intelligent frequency conversion screw air compressor
A technology of control system and frequency conversion screw, which is applied in electric controllers, controllers with specific characteristics, machines/engines, etc. It can solve the problems of no change in the difference between the feedback pressure and the set pressure, and slow response speed. , to achieve the effect of slowing down the output change rate and increasing the response speed
Active Publication Date: 2010-08-18
NINGBO MOBO COMPRESSOR
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Problems solved by technology
[0003] The variable frequency screw air compressor control system also widely uses PID controllers. The P module in the PID controller of the existing variable frequency screw air compressor, the proportional set value is a definite value, but for the difference between the feedback pressure and the set pressure There is no corresponding adjustment measure for the change of the difference between them, so the response speed of the equipment is very slow
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[0011] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0012] Referring to Fig. 1, a kind of intelligent frequency conversion screw air compressor control system includes a PID controller, and the PID controller includes a P module 1, and a feedback pressure value receiving unit 2 and a feedback pressure value receiving unit 2 are provided in the P module 1. The differential pressure calculation unit 3 connected with the signal, the pressure differential calculation unit 3 is preset with a pressure setting value, and the differential pressure calculation unit 3 calculates the pressure setting after receiving the feedback pressure value transmitted by the feedback pressure value receiving unit 2 The pressure difference value E between the value and the feedback pressure value (t) ;
[0013] The P module is also provided with a comparison module 4, the pressure difference base KE is preset...
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Disclosed is an intelligent variable frequency screw air compressor control system, which comprises a PID controller. The PID controller comprise a P module, and the P module is provided with a feedback pressure value receiving unit and a pressure difference calculating unit for calculating the difference of a pressure set value and a feedback pressure value, a comparison module for comparing a pressure difference radix and the absolute value of the pressure difference, and a selection unit. When the absolute value of the pressure difference is more than or equal to the pressure difference radix, the proportion set value of the P module is equal to a proportion set radix Kp(a); and when the absolute value of the pressure difference is less than the pressure difference radix, a proportion set value calculating unit calculates and determines the proportion set value Kp according to the follow formula: Kp=Kp(a)x|E(t)| / KE. The invention increases the reaction speed of the equipment.
Description
Technical field: [0001] The invention relates to an intelligent frequency conversion screw air compressor control system. Background technique: [0002] PID (proportional-integral-derivative) controller has been the earliest practical controller for more than 50 years, and it is still the most widely used industrial controller. The PID controller is easy to understand and does not require precise system models and other prerequisites in use, so it has become the most widely used controller. The PID controller consists of a proportional unit (P module), an integral unit (I module) and a differential unit (D module). Among them, the P module is mainly to determine the proportional setting value Kp, and then perform a series of calculations. [0003] The variable frequency screw air compressor control system also widely uses PID controllers. The P module in the PID controller of the existing variable frequency screw air compressor, the proportional set value is a definite val...
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IPC IPC(8): F04C28/24F04C28/00G05B11/42
Inventor 岑焕军谢海龙
Owner NINGBO MOBO COMPRESSOR