US 12,404,950 B2
Electric valve control device, electric valve device, and method for controlling electric valve
Kento Yamada, Tokyo (JP); Takayuki Watanabe, Tokyo (JP); and Hiroshi Hagimoto, Tokyo (JP)
Assigned to FUJIKOKI CORPORATION, Tokyo (JP)
Appl. No. 18/570,375
Filed by FUJIKOKI CORPORATION, Tokyo (JP)
PCT Filed Sep. 14, 2022, PCT No. PCT/JP2022/034456
§ 371(c)(1), (2) Date Dec. 14, 2023,
PCT Pub. No. WO2023/053973, PCT Pub. Date Apr. 6, 2023.
Claims priority of application No. 2021-162138 (JP), filed on Sep. 30, 2021.
Prior Publication US 2024/0280186 A1, Aug. 22, 2024
Int. Cl. F16K 31/04 (2006.01); F16K 27/02 (2006.01); F16K 31/50 (2006.01)
CPC F16K 31/504 (2013.01) [F16K 27/029 (2013.01); F16K 31/04 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electric valve control device for controlling an electric valve that includes a valve body including a valve seat, a rotor rotatable with respect to the valve body, a stator constituting a stepping motor together with the rotor, a valve member facing the valve seat and moving toward the valve seat when the rotor rotates in a first direction, and a stopper mechanism restricting rotation of the rotor in the first direction when the rotor is at a reference position, the electric valve control device comprising:
a rotation controller configured to input a pulse to the stepping motor to rotate the rotor in the first direction;
a voltage obtainer configured to obtain a voltage generated in the stator by the rotation of the rotor; and
a state determiner configured to determine whether the electric valve is in a first-rotation restricted state where the rotation of the rotor in the first direction is restricted, based on a degree of difference between a waveform of the voltage and a reference waveform of the voltage.