Procedure and Ottomotor arrangement with improved exhaust after-treatment by a shunt switching strategy

摘要

The invention relates to a method and to a petrol engine arrangement, wherein the petrol engine (1) is operated in an operating phase which comprises a normal operating phase and an overrun operating phase, wherein, in the normal operating phase, propellant and air are reacted in the petrol engine (1) to form an exhaust gas, wherein in the normal operating phase the petrol engine (1) is preferably operated in a lambda window around λ=1, wherein the overrun operating phase is formed by an un-fired overrun operating phase and/or a fired overrun operating phase, wherein, in the fired overrun operating phase, the gas flowing through at least one main catalytic converter (3) is low in oxygen, in particular substantially free of oxygen, wherein, in the un-fired overrun operating phase, that exhaust gas which was produced in the petrol engine (1) during the transition from the normal operating phase to the un-fired overrun operating phase is fed to the petrol engine (1) via an exhaust-gas recirculation line (9) or wherein, in the un-fired overrun operating phase, that exhaust gas which was produced in the petrol engine (1) before or during the transition from the fired overrun operating phase to the un-fired overrun operating phase is fed to the petrol engine (1) via an exhaust-gas recirculation line (9).