Vehicle Heat Pump Defrost Thresholds for Battery-Aware Cabin Heating

The control device changes the threshold for permitting defrosting operations based on outside temperature. As outside temperature decreases, the threshold becomes lower, allowing defrosting to be permitted under stricter conditions. This dynamic parameter adjustment optimizes the balance between maintaining heat exchange capability and conserving battery energy across different operating conditions.

The control device continuously monitors outside humidity and temperature conditions to determine whether to permit defrosting operations. This feedback mechanism allows the system to make real-time decisions about whether the benefits of restored heat exchange capability outweigh the energy costs, preventing unnecessary defrosting that would consume valuable battery energy.

The control device adjusts the outside humidity threshold dynamically based on outside temperature. When temperature is lower, the threshold becomes more restrictive, reducing the frequency of defrosting operations. This prevents excessive energy consumption while still maintaining adequate heat absorption efficiency when conditions are favorable.

Instead of performing defrosting operations whenever any frost is detected, the system applies a threshold-based approach that only permits defrosting when outside humidity is below a specific threshold. This partial action approach avoids unnecessary defrosting operations that would consume energy without providing proportional benefits to heat absorption efficiency.

The control device uses outside humidity as a feedback parameter to determine whether defrosting is necessary. When humidity is high, frost formation is more likely, so defrosting is permitted. When humidity is low, frost formation is less likely, so defrosting is restricted. This feedback-based decision-making prevents energy waste on unnecessary defrosting operations while maintaining heat exchange reliability when it matters.

The system dynamically changes the operational parameters for defrosting based on outside temperature. At lower temperatures where frost formation is more problematic, the threshold is adjusted to permit defrosting more readily. At higher temperatures where frost is less of an issue, the threshold becomes more restrictive, preventing energy waste on unnecessary defrosting operations.