Man Truck & Bus Ag

Man Truck & Bus Se.

Bruno Barciela

Franz Werner Prümm

Joachim Weiβ

Joachim Weiß

Martin McMackin

A method for operating a gas engine having an adjoining exhaust line through which exhaust line exhaust gas of the engine flows includes: operating the gas engine in accordance with a Miller cycle, such that a closing point of at least one intake valve of the gas engine is in a crank angle range of from about 50&#xb0; of crank angle before bottom dead center (BDC) to about 10&#xb0; of crank angle before BDC; and lowering, by at least one selective catalytic reduction (SCR) catalyst element in the exhaust line, a level of nitrogen oxides (NOx) in the exhaust gas flowing through the SCR catalyst element using hydrocarbons (CyHz) as a reducing agent. At least some of the hydrocarbons (CyHz) flowing through the SCR catalyst element are constituents of the exhaust gas of the gas engine.

Method for operating a gas engine

A combustion engine for a vehicle has an intake duct through which a fuel gas/air/exhaust gas mixture can be fed to a combustion unit of the combustion engine, and an exhaust gas recirculation system feeding in an exhaust gas from the combustion unit at an exhaust gas admission region to the gas fed to the combustion unit. A measuring device that determines the fuel gas/air/exhaust gas mass flow and the fuel gas/air/exhaust gas temperature is arranged in the intake duct upstream of the combustion unit and downstream of the exhaust gas admission region. A temperature sensor is arranged both in the exhaust gas recirculation system and in the intake duct, in each case upstream of the exhaust gas admission region, in addition to the measuring device, to determine a recirculated exhaust gas mass flow and/or an air mass flow fed to the combustion unit.

Combustion engine, in particular gas engine, for a vehicle, in particular for a commercial vehicle

A homogenization apparatus for at least two fluid flows for homogeneous gas/air mixing in a gas engine, in which at least two fluid feed lines conducting different fluid flows and one fluid outflow line conducting the homogenized fluid are connected to a central homogenization space as mixing region. In a connection region upstream of the homogenization space, the fluid feed lines have in each case one line section with a flow deflection in one direction with a flow deflection which follows downstream in the other direction and are connected in such a way that the fluid flows are fed tangentially to the homogenization space with a swirl movement imparted to them, in such a way that a rotating, turbulent flow which assists the homogenization process is formed in the homogenization space.

Homogenization apparatus for at least two fluid flows, in particular for homogeneous gas/air mixing in a gas engine

An internal combustion engine, in particular a gas engine, for a motor vehicle, includes a charge air cooler arranged in an air mass flow feed upstream of an apparatus for mixing in fuel, and a measuring device for determining the air mass flow. The measuring device has a sensor system for measuring a pressure loss across the charge air cooler and a processing unit as evaluation unit for calculating the air mass flow at least from the pressure loss which is measured by the sensor system and a charge air cooler model stored in the processing unit. The charge air cooler forms a geometrically constant throttle for the air mass flow which is flowing through.

Growing community of inventors

Nürnberg, Germany

Bruno Barciela