Bayerische Motoren Werke Aktiengesellschaft

Bayerische Motoren Werke Aktiengellschaft

Jochem Huber

Gerhart Huemer

Norbert Dembinski

Michael Preis

Juergen Ringler

Sebastian Kobler

Gunter Ranzinger

Josef Krowiorz

Simon Rogge

Christian Liebl

Bernhard HÖSS

Jürgen Ringler

An operating method for a system including a reformer which in reformate mode can convert hydrocarbon-containing fuel to a hydrogen-rich reformate gas, and a catalytic exhaust gas aftertreatment device which is acted upon by reformer gas to reach the catalytic converter light-off temperature more rapidly. During cold starts, the reformer, after its own starting phase, is initially operated in a so-called lean-burn mode, and the reformer is switched from lean-burn mode to reformate mode as soon as combustible constituents in the catalytic aftertreatment device can be independently oxidized. During the reformer lean-burn mode, the combustible constituents of the engine's exhaust gas react with the hot reformer gas, such that the cumulative exhaust gas flow has the composition of exhaust gas generated by stoichiometric combustion.

Operating method for a system composed of a reformer and a catalytic exhaust gas aftertreatment device

A cooling system for an internal-combustion engine of a motor vehicle having a radiator and a thermostatic valve by which the temperature of the coolant can be controlled in a warm-up operation, a mixed operation and a radiator operation. The thermostatic valve contains an expansion element which can be electrically heated for reducing the coolant temperature, the expansion element being designed such that the coolant temperature is set without heating the expansion element in the warm-up operation and/or in the mixed operation to an upper working limit temperature. A control unit is provided which, as a function of sensed operating and/or environmental quantities of the internal-combustion engine, activates the heating of the expansion element, as required, in order to shift the operating mode of the cooling system from the warm-up operation or from the mixed operation of the upper working limit temperature in the direction of the mixed operation or radiator operation of a coolant temperature which is lower with respect to the upper working limit temperature.

Cooling system for an internal-combustion engine of a motor vehicle

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Munich, Germany

Jochem Huber