Honeywell International Inc.

Karthik Giritharan

Nagaraja Sundaresh

Amol Kinage

Dinesh Kumar Kn

Sachin Kumar

Sai Krishnan Jagannathan

Ananda Huchappa Shastry

Sunil M Ingawale

Rakesh Muraleedharan Nair

Srinivasan Rajagopal

Arulvel Sellamuthu

Manjunatha Kotreshi Alabur

Rakesh Damodaran Nair

A method includes measuring a first voltage (V) across a first sensing coil of a linear variable differential transformer (LVDT) and measuring a second voltage (V) across a second sensing coil of the LVDT. The method also includes signaling a core fallout condition in response to (i) determining that a ratio of Vand Vis within a specified range of a value of one and (ii) determining that a sum of Vand Vis less than a sum of Vand Vby more than a specified amount. Vand Vare minimum voltages across the first and second sensing coils of the LVDT, respectively, when a core of the LVDT is in the LVDT.

Method and apparatus for detection of LVDT core fallout condition

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.

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

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Bengaluru, India

Karthik Giritharan