公开(公告)号：US20220412481A1

公开(公告)日：2022-12-29

申请号：US17362475

申请日：2021-06-29

Applicant: Bell Textron Inc.

Inventor： David M. Angell ,  Keith D. Weaver ,  Richard G. Otten

IPC: F16K37/00 ,  F16K1/22 ,  G05B15/02

Abstract: A method and system for controlling a fluid valve are described that avoid the effects of hysteresis. In hysteresis, the power signals associated with a valve position are different on the upstroke and downstroke. As a result, predicting the valve position can be difficult if you only know the current power signal. Instead of using upstrokes and downstrokes, a valve can momentarily be set to zero power, or a rest position when receiving a new command signal. This way the command signal is applied from a zero power or rest position, making the valve position more predictable and accurate.

公开(公告)号：US11802632B2

公开(公告)日：2023-10-31

申请号：US17362475

申请日：2021-06-29

Applicant: Bell Textron Inc.

Inventor： David M. Angell ,  Keith D. Weaver ,  Richard G. Otten

IPC: F16K1/22 ,  F16K37/00 ,  G05B15/02

CPC classification number: F16K37/0041 ,  F16K1/221 ,  G05B15/02

Abstract: A method and system for controlling a fluid valve are described that avoid the effects of hysteresis. In hysteresis, the power signals associated with a valve position are different on the upstroke and downstroke. As a result, predicting the valve position can be difficult if you only know the current power signal. Instead of using upstrokes and downstrokes, a valve can momentarily be set to zero power, or a rest position when receiving a new command signal. This way the command signal is applied from a zero power or rest position, making the valve position more predictable and accurate.