Anti-out-of-step control method and control device for air-conditioning system and electronic expansion valve thereof

Abstract

The invention discloses an air conditioner system and an out-of-step prevention control method and control device of an electronic expansion valve of the air conditioner system. The out-of-step prevention control method comprises the following steps that in the action process of the electronic expansion valve, the needed changing step number of the electronic expansion valve is acquired; whether the needed changing step number is smaller than preset minimum adjustment step number or not is judged; if the needed changing step number is smaller than the preset minimum adjustment step number, theelectronic expansion valve is forbidden to act, the needed changing step numbers are accumulated, when the accumulated step number is larger than or equal to the preset minimum adjustment step number, the electronic expansion valve is controlled to act, and the accumulated step number is subjected to zero clearing; and if the needed changing step number is larger than or equal to the preset minimum adjustment step number, the electronic expansion valve is directly controlled to act. By means of the control method, the electronic expansion valve can be finely adjusted according to the size ofthe needed changing step number of the electronic expansion valve, frequent action is not needed, the probability of out of step is greatly reduced, and the reliability of system running is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an out-of-step control method for an electronic expansion valve in an air-conditioning system, an out-of-step control device for an electronic expansion valve in an air-conditioning system, and an air-conditioning system with the control device. Background technique [0002] The control of the air conditioning system is becoming more and more precise. The system has begun to use electronic expansion valves to achieve precise control of the flow rate. The electronic expansion valve control methods currently used are all open-loop control, which cannot detect the specific position of the electronic expansion valve opening. In order to solve the above problems, in related technologies, when the system is powered on, the electronic expansion valve is closed for a total number of steps, and then a certain number of steps is added to confirm that the reference position has been...

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Problems solved by technology

[0003] However, the stepper motor opens and closes the valve back and forth during the action process, which will cause out of step. Therefore, in the control process, the specific opening and position of the electronic expansion valve cannot be determined, and can only be confirmed based on the open-loop calculation. position, but the position is inaccurate, for example, when calculating the opening degree, it is considered that the current opening degree of the electronic expansion valve is 100%, but due to the stepping motor out of step, the actual opening degree does not reach 100%, resulting in inaccurate adjustment, resulting in system instability

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