US 12,140,033 B2Granted

Valve position control

AssigneeABB Schweiz AG

InventorsCamilo Lopez, Mark Foltz, Steve Miller, Kevin Dowdell, Mark Wieland, Alan Majors

Life of this patent

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Abstract

A system for controlling a turbine valve is provided. The system includes a hydraulic pilot valve section being moveable in a first direction and a second direction; a main hydraulic valve section being moveable in a first direction to close the turbine valve and a second direction to open the turbine valve; a position demand indicating a desired position of the turbine valve; a first feedback indicating an actual position of the hydraulic pilot valve section; and aa second feedback indicating an actual position of the main hydraulic valve section. The system also includes a pilot valve error; a main valve error; a turbine valve error; and a pilot valve adjustment moving the hydraulic pilot valve section in response to the turbine valve error. The turbine valve error is repeatedly determined and the pilot valve adjustment repeatedly moves the hydraulic pilot valve section to minimize the turbine valve error.

Claims20

Dependent claims

A system for controlling a turbine valve, comprising:

a hydraulic pilot valve section being moveable in a first direction of the hydraulic pilot valve section from a middle position and moveable in a second direction of the hydraulic pilot valve section from the middle position opposite from the first direction of the hydraulic pilot valve section;
a main hydraulic valve section being moveable in a first direction of the main hydraulic valve section to close the turbine valve when the hydraulic pilot valve section is moved in the first direction of the hydraulic pilot valve section and moveable in a second direction of the main hydraulic valve section to open the turbine valve when the hydraulic pilot valve section is moved in the second direction of the hydraulic pilot valve section;
a position demand indicating a desired position of the turbine valve;
a first feedback indicating an actual position of the hydraulic pilot valve section;
a second feedback indicating an actual position of the main hydraulic valve section;
a pilot valve error determined by a difference between the middle position of the hydraulic pilot valve section and the first feedback;
a main valve error determined by a difference between the position demand and the second feedback;
a turbine valve error determined by combining the pilot valve error and the main valve error;
and
a pilot valve adjustment moving the hydraulic pilot valve section in response to the turbine valve error;
wherein the turbine valve error is repeatedly determined and the pilot valve adjustment repeatedly moves the hydraulic pilot valve section to minimize the turbine valve error.

8 more elements

A method for controlling a turbine valve, wherein the turbine valve comprises a hydraulic pilot valve section being moveable in a first direction of the hydraulic pilot valve section from a middle position and moveable in a second direction of the hydraulic pilot valve section from the middle position opposite from the first direction of the hydraulic pilot valve section, and a main hydraulic valve section being moveable in a first direction of the main hydraulic valve section to close the turbine valve when the hydraulic pilot valve section is moved in the first direction of the hydraulic pilot valve section and moveable in a second direction of the main hydraulic valve section to open the turbine valve when the hydraulic pilot valve section is moved in the second direction of the hydraulic pilot valve section, the method comprising:

indicating, using a position demand, a desired position of the turbine valve;
indicating, using a first feedback, an actual position of the hydraulic pilot valve section;
indicating, using a second feedback, an actual position of the main hydraulic valve section;
determining a pilot valve error based on a difference between the middle position of the hydraulic pilot valve section and the first feedback;
determining a main valve error based on a difference between the position demand and the second feedback;
determining a turbine valve error based on combining the pilot valve error and the main valve error;
performing a pilot valve adjustment moving the hydraulic pilot valve section in response to the turbine valve error;
and
repeatedly determining the turbine valve error, and repeatedly performing the pilot valve adjustment moving the hydraulic pilot valve section to minimize the turbine valve error.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/494,907Filed 26 Oct 2023 · continuation
Priority: 9 May 2018
Published: US 2024/0102388 A128 Mar 2024
Granted: 12 Nov 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification48 codes

F01C 20/28
Control of, monitoring of, or safety arrangements for, machines or engines: safety arrangements; Monitoring
F01D 17/06
Arrangement of sensing elements: responsive to speed
F01D 17/145
By means of shiftable members or valves obturating part of the flow path: by means of valves, e.g. for steam turbines
F01D 17/26
The operation or power assistance being predominantly non-mechanical: fluid, e.g. hydraulic

Family

Application62/669,070Us provisional application · filed 9 May 2018
Application62/669,057Us provisional application · filed 9 May 2018
Application62/669,048Us provisional application · filed 9 May 2018
Application62/669,042Us provisional application · filed 9 May 2018
Application62/669,063Us provisional application · filed 9 May 2018
PCT/US2019/031447Parent of this continuation · filed 9 May 2019
Application17/092,477Parent of this continuation · filed 9 Nov 2020
US 2024/0102388 A1Pre-grant publication · published 28 Mar 2024
US 11,814,964 B2Parent of this continuation
US 2021/0054765 A1Published application
US 2022/0154602 A9Published application
US 12,140,033 B2This patent

From the US filing history. Foreign family members aren’t listed.