Method for operating vehicle heating system in auxiliary heating mode, involves activating fan based on determined temperature and temperature gradient of heat carrier medium for conveying air

摘要

The method involves operating a fuel-powered heater (14) of a vehicle heating system for transferring heat energy to heat transfer medium. A heat transfer medium pump (20) is operated by a drive unit (12) for circulating the heat transfer medium in a heat transfer circuit (18). A switching valve is provided for switching the medium between a drive circuit and the heater. Temperature and temperature gradient of the heat carrier medium are determined. A fan (24) is activated based on the determined temperature and temperature gradient of the heat carrier medium for conveying air (L).