Vehicle heat pump with defrosting mode

This vehicle air conditioner uses a heat pump with an exterior heat exchanger and two interior heat exchangers inside the cabin. When frost is detected on the exterior unit, the system first switches to a heating mode using one interior heat exchanger, then to a defrosting mode, with the final switch to defrosting triggered by monitoring the refrigerant's state.

Why it matters: The patent's focus on efficient defrosting for a vehicle heat pump (F25D21/125) is more critical now with widespread EV adoption, where cabin heating directly impacts range. Advances in frost detection (B60H1/00785) and refrigerant state sensing (Claim 3) since 2016 could simplify or improve the control logic for this specific defrosting sequence.

Status: ExpiredProtection ended and was never renewed
How hard to build: SpecializedRefrigerant circuit, multiple heat exchangers, control logic

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