초록 ▼

Electrical circuitry for monitoring the current flow through resistance elements on the leading edge of an aircraft wing or horizontal stabilizer. The resistance elements are individually and sequentially activated for heating to thereby effect a de-icing or anti-icing function. The non-activated el

Electrical circuitry for monitoring the current flow through resistance elements on the leading edge of an aircraft wing or horizontal stabilizer. The resistance elements are individually and sequentially activated for heating to thereby effect a de-icing or anti-icing function. The non-activated elements are sensed by the circuitry to determine inferentially if there is a predetermined current flow through the heating elements to achieve the intended de-icing or anti-icing function.

대표청구항 ▼

A circuit for monitoring electrical current from a source of power along lead line means to a load means comprising switch means in said lead line means being sequentially operative from a first mode wherein load current may flow from the source of power to said load means, to a second mode wherein

A circuit for monitoring electrical current from a source of power along lead line means to a load means comprising switch means in said lead line means being sequentially operative from a first mode wherein load current may flow from the source of power to said load means, to a second mode wherein test current may flow along another line means for determining whether the impedance of load is the correct magnitude, impedance measurement means operatively coupled with said switch means for determining impedance of the load means when said switch means is in the second mode, voltage measurement means for determining the voltage present at the load means, current determining means operatively coupled with said impedance measurement means and said voltage measurement means for determining load current being delivered to the load means as a function of signals received from said impedance measurement means and said voltage measurement means, switching control means for periodically changing said switch means from the first mode to the second mode and for periodically rendering operative said impedance measurement means, voltage measurement means and current determining means, and output means activated from said current determining means for response to whether or not the load means are being operated in a predetermined manner.