发明授权
- 专利标题: Fluid pressure control apparatus/process
- 专利标题(中): 流体压力控制装置/过程
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申请号: US12649881申请日: 2009-12-30
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公开(公告)号: US08150555B2公开(公告)日: 2012-04-03
- 发明人: Takashige Hinami , Yoshio Morita
- 申请人: Takashige Hinami , Yoshio Morita
- 申请人地址: JP Fuji-shi
- 专利权人: Jatco Ltd
- 当前专利权人: Jatco Ltd
- 当前专利权人地址: JP Fuji-shi
- 代理机构: Foley & Lardner LLP
- 优先权: JP2009-033613 20090217; JP2009-140022 20090611
- 主分类号: G06F19/00
- IPC分类号: G06F19/00 ; F16K51/00
摘要:
A fluid pressure control apparatus for controlling a solenoid valve to increase and decrease a fluid pressure by varying a valve opening degree includes a controller to control the fluid pressure by varying a command current for driving the solenoid valve. The controller calculates a hysteresis correction quantity to reduce a hysteresis effect of a hysteresis characteristic of the fluid pressure outputted from the solenoid valve with respect to the command current varied in an increasing direction and a decreasing direction, and varies the command current to control the fluid pressure to a target pressure in accordance with the hysteresis correction quantity. The controller calculates the hysteresis correction quantity in accordance with a turn-to-turn variation quantity determined from a current difference between a first command current value at a first changeover of a varying direction of the command current from one of the increasing and decreasing directions to the other and a second command current value at a second changeover of the varying direction of the command current before the first changeover.
公开/授权文献
- US20100211229A1 FLUID PRESSURE CONTROL APPARATUS/PROCESS 公开/授权日:2010-08-19
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