The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2014
Filed:
Oct. 05, 2011
Takao Goto, Mie, JP;
Toshihiro Aono, Hitachinaka, JP;
Tetsuroh Kawai, Kumagaya, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
In a flow control device, a comparatoroutputs a first control voltage Vref based on a comparison of an instruction value signal Viof the flow volume and a signal Viaccording to the sensor output signal Vs. A feedback current generatorgenerates a feedback current Ifb according to a difference between the sensor output signal Vs and a signal Viaccording to the instruction value signal Vi. A feedback voltage generatoris a resister. A feed forward current generatorgenerates a feed forward current Iff according to the instruction value signal Vi. A synthesis unitgenerates a second control voltage Vdrv* obtained by adding to the feedback voltage Vfb a voltage according to a sum of the feedback current Ifb and the feed forward current Iff. The valve unitis controlled according to the first and the second control voltage Vref, Vdrv*.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile