Method and control device for operating a gas engine

Abstract

A method for operating a gas engine (10) with an exhaust gas catalytic converter (13) and with an exhaust gas recirculation (12), wherein the gas engine (10) comprises cylinders (11), which comprise a main combustion chamber (14) and a precombustion chamber (15), wherein the exhaust gas (23) leaving the cylinders (11) is conductible via the exhaust gas catalytic converter (13), and wherein a part of the exhaust gas (23) leaving the cylinders, is conductible via the exhaust gas recirculation (12) in the direction of the cylinders (11). In a first operating strategy, the gas engine (10) is operated in such a manner that exhaust gas (23) conducted via the exhaust gas recirculation (12) is conducted in the direction of the main combustion chambers (14) of the cylinders, so that the gas / air mixture (18) to be fed to the main combustion chambers contains exhaust gas; that exhaust gas (23) conducted via the exhaust gas recirculation is not conducted in the direction of the precombustion chambers (15) of the cylinders, so that the gas / air mixture (19) to be fed to the precombustion chamber does not contain any exhaust gas; that the gas proportion of the gas / air mixture (18) to be fed to the main combustion chambers (14) of the cylinders (11) is controlled in such a manner that the combustion in the cylinders takes place at a stoichiometric combustion air ratio or a lambda value of 1.

Description

technical field [0001] The invention relates to a method for operating a gas engine and to a control device for carrying out said method. Background technique [0002] Gas engines with an exhaust gas catalytic converter and an exhaust gas recirculation device are known from practice, wherein the exhaust gas generated in the cylinders of the gas engine during the combustion of the gas / air mixture can be guided via the exhaust gas catalytic converter and where the exit A part of the exhaust gases of the cylinders may be recirculated in the direction of the cylinders via the exhaust gas recirculation device or may be mixed with the gas / air mixture to be fed to the cylinders. [0003] Furthermore, gas engines according to the lean combustion method (super-stoichiometric ratio) are known, the cylinders of which comprise either only the main combustion chamber or pre-combustion chambers in addition to the main combustion chamber, where in the cylinder In the case of a gas engine ...

AI Technical Summary

Problems solved by technology

Because the main combustion chamber is very lean, only small amounts of NOx are produced and there is only a low tendency to knock, making high performance density and high efficiency possible

Images