The system has a blower (24) for producing a hot air flow for feeding into a vehicle interior, a heater (22) with a heat exchanger arrangement (26) for heating the hot air flow, a mixer arrangement (20) for setting an external/recirculated air ratio of air...

The fuel cell system has a gas generation system (12) for generating a hydrogen-containing gas mixture, a fuel cell (14), a catalytic burner (24), a heat exchanger arrangement (28,30) for transferring heat generated in the catalytic to a thermal bearer med...

The heat exchanger unit (10) comprises a barrel-shaped outer housing (12) and barrel-shaped inner housing (14), between which is a flow passage (26) for the fluid to be heated. The inner housing in the region of its circumferential wall (20) is constructed...

Method for controlling a motor vehicle heating unit, based on the actual temperature value (I), has the following steps: (a) measurement of the temperature value (mi) (b) comparison of the measurement value with the current determined actual value (c) if t...

The vehicle heater has an exhaust gas channel system (70). This passes the gases over the outer side (62) of the combustion chamber (16) wall (18) and the outer side (64) of its base (22).

Heating device, especially a water heating device (20) of a motor vehicle in the form of an auxiliary heater has a housing mantle (1) and heat exchanger (2) as well as an electronic control unit (11) for regulating heating using a temperature sensor (3). A...

The liquid auxiliary dosing system includes a determining arrangement (38) for determining an operating variable in the operating of the dosing pump unit (14), characterizing and adjusting this. A comparison-judgment unit (42,44) is provided for comparing ...