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US 4,788,490 AGranted
Method of measuring resistance of a control servovalve
AssigneeThe Boeing Company
InventorAndrew M. Valaas
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Abstract
A method for measuring resistance of an electromagnetic servovalve associated with a brake torque limiting control system. The servovalve is controlled by two parallel connected controllers, one a current driver controller and the other a voltage driver controller whose output is dependent upon the resistance value being measured. The method includes a short series of sequential steps and computation executed by the voltage driver controller.
Claims1
In combination in a system comprising:
- a first control circuit having a current driver output;
- a second control circuit having a voltage driver output;
- said first and second control circuits connected in parallel through series connected diodes to a current-sensitive control device;
- the method of determining the electrical resistance R of said current-sensitive control device comprising the sequential steps of:
- applying an electrical control voltage V.sub.1 ;
- measuring the resultant electrical current output I.sub.1 ;
- applying a second electrical control voltage V.sub.2 ;
- measuring the second electrical current output I.sub.2, and then determining the resistance R in accordance with the differential form of Ohms law:
- R=(V.sub.2 -V.sub.1)/(I.sub.2 -I.sub.1);
- wherein said first control circuit comprises an aircraft antiskid control system and said second control circuit comprises a brake torque limiter control circuit.
7 more elements
Dependencies are inferred from the claim text.