Method of measuring resistance of a control servovalve
First Claim
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1. 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 V1 ;
measuring the resultant electrical current output I1 ;
applying a second electrical control voltage V2 ;
measuring the second electrical current output I2, and then determining the resistance R in accordance with the differential form of Ohms law;
space="preserve" listing-type="equation">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.
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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.
15 Citations
1 Claim
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1. In combination in a system comprising:
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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 V1 ; measuring the resultant electrical current output I1 ; applying a second electrical control voltage V2 ; measuring the second electrical current output I2, and then determining the resistance R in accordance with the differential form of Ohms law;
space="preserve" listing-type="equation">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.
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Current AssigneeThe Boeing Co.
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Original AssigneeThe Boeing Co.
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InventorsValaas, Andrew M.
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Primary Examiner(s)Eisenzopf, Reinhard J.
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Assistant Examiner(s)Solis, Jose M.
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Application NumberUS07/068,690Time in Patent Office516 DaysField of Search303/20, 303/17, 303/103, 374/172, 374/173, 374/163, 324/62 R, 324/64, 324/65 R, 324/158 D, 324/158 T, 324/430US Class Current324/713CPC Class CodesG01R 27/02 Measuring real or complex r...
