System and method for testing a secondary servo control circuit in a redundant control configuration

US8587320B2 · kind B2 · utility

Assignee

• HONEYWELL INTERNATIONAL INC. · US

Inventors

• Dinesh Kumar KN · Bengaluru, IN
• Nagaraja Sundaresh · Survanagiri, IN
• Karthik Giritharan · Bengaluru, IN
• Srinivasan Rajagopal · Bengaluru, IN
• Amol Kinage · Bengaluru, IN
• Rakesh Damodaran Nair · Bengaluru, IN
• Sai Krishnan Jagannathan · Savanuru, IN
• Sunil M. Ingawale · Pune, IN
• Sachin Kumar · Freeport, US

Key dates

• Filing date: Nov 9, 2010
• Grant date: Nov 19, 2013
• Expiry date: Jan 7, 2032

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B2211/8757
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A system, apparatus and method are provided for testing a secondary servo control circuit in a redundant control configuration. A first circuit is configured to receive a control signal and to control an attribute of an actuator based on the control signal using a first control input of the actuator. A second circuit is configured to test operation of an actuator circuit using a test signal. The actuator circuit includes at least part of the second circuit and a second control input of the actuator. The test signal is selected to avoid causing independent motion of the actuator. The actuator could be a dual coil servo valve, and the test signal could be a current (such as a DC current, an AC current, or a pulsed current) having a magnitude less than a bias current of the actuator.