VEHICULAR HVAC SYSTEM WITH MODIFIED AIR RECIRCULATION FOR START-STOP ENGINE

摘要

A method controls a recirculation position of a return vent in an HVAC system for a vehicle with a compressor driven by a start/stop engine. A partial s recirculation position is set according to a basic recirculation strategy while the engine is operating. An auto stop event is entered at a time with the compressor operating. A full recirculation position is set during the stop event if a plurality of low fogging probability indicators are true. The low fogging probability indicators include a sensed ambient temperature being above a predetermined temperature, a sensed state of a windshield wiper being an off state, and a sensed sunload being above a predetermined sunload.

主权项

1. A method of controlling a recirculation position of a return vent in an HVAC system for a vehicle with a compressor driven by a start/stop engine, comprising:
controlling a partial recirculation position according to a basic recirculation strategy; entering an auto stop event at a time with the compressor operating; and setting a full recirculation position during the stop event if a plurality of low fogging probability indicators are true.