초록 ▼

The invention relates to a test unit for testing the operation and accuracy of a microcomputer controlled aircraft fuel gaging system or processor which involves a characterized liquid gaging system sensor and sensor apparatus for determining a depth of liquid in a tank at a particular location in t

The invention relates to a test unit for testing the operation and accuracy of a microcomputer controlled aircraft fuel gaging system or processor which involves a characterized liquid gaging system sensor and sensor apparatus for determining a depth of liquid in a tank at a particular location in the tank. The fuel gaging system sensor is the wetted length type capacitance probe. The test unit hereof performs tests on processors prior to their being installed in aircraft and operates to provide a real time simulation of capacitive probes which in effect replaces the aircraft tank and probes thereof in testing the processors. A single reference capacitor simulates by multiplexing the capacitances of the set of tank probes, which in operation are scanned in succession by the processor, to verify the proper operation of the processor. The simulation provides a static fuel level from zero to one hundred percent and in addition a dynamic fuel level may be represented wherein the fuel is being loaded into or out of the tank.

대표청구항 ▼

A test unit for a liquid gaging system having probe lines for connection to sensors responsive to the depth of a liquid in a tank at particular locations and a common return line connected to said sensors, said system having means for supplying excitation signals to said probe lines and means for re

A test unit for a liquid gaging system having probe lines for connection to sensors responsive to the depth of a liquid in a tank at particular locations and a common return line connected to said sensors, said system having means for supplying excitation signals to said probe lines and means for reading said sensors via said common lines return for liquid depth information at each of said sensors, said system having means for processing said information to calculate the liquid fuel volume in said tank; said test unit being connected to said probe lines and said return line in lieu of said sensors, said test unit comprising, storage means for storing characterization parameters simulating said sensors based on tank shape and volume and the location of said sensors in said tank with said parameters representing said depth information over a range of simulated tank fill conditions from zero to full, a reference element connected to said return line, control means for setting desired simulated tank levels, and means for processing said excitation signals via said storage means and said reference element to place current values on said return line which correspond to simulated levels set by said control means.