Hamilton Sundstrand Corporation

Eduardo Ahuactzin Parra

Michael A Wilson

A solenoid electrical diagnostic system includes a solenoid circuit operable in response to an electrical current. A low-side switch includes a low-side input configured to receive a pulsed voltage signal and a low-side output in signal communication with the solenoid circuit. The low-side switch continuously switches between an on-state and an off-state based on the pulsed voltage signal to adjust a level of the current flowing through the solenoid circuit. A solenoid monitoring unit generates a low-side output state signal based on an output voltage at the low-side output, and a low-side input state signal based on an input voltage at the low-side input. The solenoid electrical diagnostic system further includes an electronic hardware controller determines at least one operating condition of the solenoid circuit based on a comparison between the state signals and a threshold value.

Solenoid diagnostics digital interface

A fast shut-off solenoid circuit network includes a solenoid circuit and a current dissipation circuit. The solenoid circuit is operable in response to an electrical current, and configured to operate in an enable mode and a disable mode. The current dissipation circuit is configured to dissipate the current discharged from the solenoid circuit in response to invoking the disable mode. The fast shut-off solenoid circuit network further includes a dissipation bypass circuit. The dissipation bypass circuit is configured to divert the current discharged by the solenoid circuit away from current dissipation circuit when operating in the enable mode.

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Phoenix, AZ, United States of America

Eduardo Ahuactzin Parra