Electric valve control device and electric valve device including the electric valve control device

Abstract

Provided are an electric valve control device capable of reliably preventing a decrease in valve opening degree control accuracy due to out-of-step, and an electric valve device including the electric valve control device. When it is detected that the current opening degree of the electric valve (9) is different from the opening degree stored in the electric valve control device (11), an initialization request signal is output to the outside (the air conditioner ECU (16) as the system control device) .

Description

technical field [0001] The present invention relates to an electric valve control device for controlling the valve opening of an electric valve, and an electric valve device provided with the electric valve control device. Background technique [0002] In the past, in the refrigeration cycle system used in air conditioners, refrigerated / freezer showcases, etc., the flow rate of the circulating refrigerant was adjusted for the purpose of stabilizing the cooling capacity, maintaining a constant degree of superheat, and high-efficiency operation. Adjustment at this time is performed in a timely manner, and electric valves such as electric expansion valves and flow control valves are widely used in which the valve element is moved by a stepping motor. In addition, there are electric valves such as a stop valve that uses a stepping motor to open and close the refrigerant flow path to flow or shut off the refrigerant, and a three-way valve (flow path switching valve) that switches...

AI Technical Summary

Problems solved by technology

[0010] However, although the stepping motor of the above-mentioned electric valve usually rotates synchronously with the input pulse, due to various reasons such as overload and sudden speed change, it may sometimes be out of sync with the input pulse (this phenomenon is called out-of-step or synchronization deviation)

As mentioned above, in the conventional electric valve driven by the open-loop control that does not feed back the absolute opening (actual opening), if the above-mentioned out-of-synchronization occurs, the out-of-synchronization state will be maintained until the next initialization (such as , when the power is turned on next time), therefore, the control accuracy of the valve opening during this period may decrease

[0011] In addition, in the past, on the main ECU side as the control device of the system, it is necessary to judge and initialize, but this judgment is difficult, and there are cases where the life of the electric valve is shortened by performing more than necessary initialization, or the normal control cannot be performed without performing necessary initialization. Possibility of valve opening

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