Techniques for managing and maintaining systemic efficiency during hydrogen refueling for fuel cell electric vehicles

A refueling control method for a fuel cell electrified vehicle (FCEV), the refueling control method comprising:

• providing an electrified vehicle control unit (EVCU) configured to control a set of primary operations of the FCEV;
• providing a fuel cell propulsion system (FCPS) configured to control a set of secondary operations of the FCEV relating to a fuel cell system of the FCEV;
• providing a controller area network (CAN) connecting the EVCU to the FCPS;
• providing a set of hardwire wakeup lines connecting the EVCU and the FCPS to each other and each to other primary modules;
• in response to initiation of a refueling operation of the FCEV where a fuel is provided to the FCEV via a fuel hose and a fuel supply system:
• commanding, by the EVCU via the set of hardwire wakeup lines, the FCPS to transition from a sleep state to an awake state;
• and
• in response to transitioning to the awake state, acting, by the FCPS, as a primary controller while the EVCU acts as a secondary controller during the refueling operation including (i) the FCPS remaining in the awake state and handling the refueling operation and (ii) commanding, by the FCPS via the set of hardwire wakeup lines, the EVCU and the other primary modules to transition to the sleep state to save low voltage power during the refueling operation.