US 11,655,832 B2
Control method of gas pressure actuator and control calculation device
Tatsuya Yoshida, Kanagawa (JP); and Shinya Hamada, Kanagawa (JP)
Assigned to SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed by SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed on Dec. 3, 2021, as Appl. No. 17/542,010.
Claims priority of application No. JP2020-202876 (JP), filed on Dec. 7, 2020.
Prior Publication US 2022/0178389 A1, Jun. 9, 2022
Int. Cl. F15B 9/09 (2006.01)
CPC F15B 9/09 (2013.01) [F15B 2211/6336 (2013.01); F15B 2211/6656 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A control method of a gas pressure actuator which includes a guide portion and a slider configured to move along the guide portion, and in which a cylinder chamber is formed between the guide portion and the slider, a pressure receiving plate for partitioning the cylinder chamber into two pressure chambers in a moving direction is provided in one of the guide portion and the slider, and the slider is driven by a differential pressure between the two pressure chambers by allowing compressed gas to enter and exit each of the two pressure chambers via two servo valves, the gas pressure actuator including
a position sensor for detecting a position of the slider,
two servo amplifiers for controlling each of the two servo valves, and
a control calculation device that receives a position detection signal from the position sensor and outputs a position command value to the two servo amplifiers, the control method comprising:
causing the control calculation device to
perform a calculation of compensating for a volume change amount of each pressure chamber caused by a positional change of the pressure receiving plate inside the cylinder chamber, for each position command value applied to the two servo amplifiers, and thereafter
output each of compensated position command values to the two servo amplifiers,
execute origin positioning for the position of the slider in order to compensate for the volume change amount, and
switch a gain at a time when each position command value applied to the two servo amplifiers is calculated based on the position detection signal from the position sensor, before and after a completion of the origin positioning.