Control method and system for electronic expansion valve
An electronic expansion valve and control method technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of stepper motor out of step, affecting the precise control of electronic expansion valve, etc., and achieve the effect of improving control accuracy
Active Publication Date: 2016-02-03
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
The adjustment of the electronic expansion valve is realized through the control of the internal stepping motor. The most commonly used control method of the existing electronic expansion valve opening is the control method of uniform switching pulse, that is, the stepping motor The energization method is square wave input. Since the space torque generated by the square wave signal is not equal, the stepping angle of the stepping motor will also be unequal, which will cause the stepping motor to be prone to out-of-step phenomenon during operation, and then Affects the precise control of the electronic expansion valve
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[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0040] Such as figure 1 As shown, it is a control method of an electronic expansion valve disclosed in Embodiment 1 of the present invention, including:
[0041] S101. Generate two sinusoidal pulse width modulated waves with a phase difference of 90°;
[0042] When it is necessary to control the electronic expansion valve, based on the space vector design of the magnetomotive force of the stepping motor coil, the stepping motor is controlled through the pulse...
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The invention discloses a control method for an electronic expansion valve. The method includes the steps that two sine pulse width modulation waves with phase position difference of 90 degrees are generated; and the stepping angles of a stepping motor in the electronic expansion valve are controlled according to control signals of the pulse width modulation waves. The stepping angles of the stepping motor can be controlled to be uniformly and equally divided, so that the control accuracy of the electronic expansion valve is improved. The invention further discloses a control system for the electronic expansion valve.
Description
technical field [0001] The present invention relates to the technical field of electronic expansion valves, in particular to a control method and system for electronic expansion valves. Background technique [0002] At present, in the air conditioning industry, electronic expansion valves are usually used to control the amount of refrigerant introduced into the compressor. The adjustment of the electronic expansion valve is realized through the control of the internal stepping motor. The most commonly used control method of the existing electronic expansion valve opening is the control method of uniform switching pulse, that is, the stepping motor The energization method is square wave input. Since the space torque generated by the square wave signal is not equal, the stepping angle of the stepping motor will also be not completely equal, which will cause the stepping motor to be prone to out-of-step phenomenon during operation. Affects the precise control of the electronic...
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IPC IPC(8): F25B41/06F25B49/02F25B41/34
CPCY02B30/70
Inventor 陈万兴王驰刘萍姚勇韬程会恩
Owner GREE ELECTRIC APPLIANCES INC