Systems and methods for detecting an uncommanded brake overdrive condition

A method for detecting an uncommanded brake overdrive condition in a brake control system for an aircraft, the method comprising:

• determining, by an electric brake actuator controller (EBAC), a nominal load cell current;
• measuring, by the EBAC, a load cell current of a plurality of individual load cells in parallel, the EBAC configured to provide the load cell current to the plurality of individual load cells via shared excitation wiring;
• comparing, by the EBAC, the measured load cell current and the nominal load cell current;
• measuring, by the EBAC, a voltage excitation signal comprising a Vexc+ signal (Vexc+) and a Vexc− signal (Vexc−);
• computing, by the EBAC, a sum of the voltage excitation signals (Vexc+ and Vexc−);
• measuring, by the EBAC, for each individual load cell of the plurality of individual load cells, an LC Sig+ load cell output signal (LC Sig+) and an LC Sig− load cell output signal (LC Sig−);
• computing, by the EBAC, a difference between a sum of the load cell output signals (LC Sig+ and LC Sig−) for each individual load cell and the sum of the voltage excitation signals (Vexc+ and Vexc−);
• and
• detecting, by the EBAC, at least one resistance disturbance indicating the uncommanded brake overdrive condition in response to an absolute value of the difference being greater than a predefined threshold, in response to the measured load cell current being less than the nominal load cell current, or both.

A brake control system comprising:

• an electric brake actuation controller (“EBAC”);
• sense wiring connected to the EBAC, wherein the EBAC is configured to receive a sensed voltage from each individual load cell of a plurality of individual load cells in parallel via the sense wiring;
• shared excitation wiring connected to the EBAC, wherein the EBAC is configured to provide a load cell current to the plurality of individual load cells in parallel via the shared excitation wiring;
• control wiring connected to the EBAC, wherein the EBAC is configured to provide a control voltage to an electric brake actuator (“EBA”) via the control wiring, and
• wherein the EBAC is further configured to detect at least one resistance disturbance in the excitation wiring indicating a brake overdrive condition in response to the load cell current being less than a nominal load cell current, in response to an absolute value of the difference between a sum of load cell control output signals (LC Sig+ and LC Sig−) from at least one individual load cell of the plurality of individual load cells and a sum of excitation voltage signals (Vexc+ and Vexc−) being greater than a predefined threshold, or both.