Internal combustion engine for motor car, has switchable bypass arranged parallel to wastegate bypass in turbine housing, and additive catalytic converter arranged in switchable bypass, where wastegate bypass controls wastegate valve

摘要

The engine (1) has an exhaust system (5) comprising a catalytic converter (10) that is arranged downstream of a turbine (7) of a supercharger (6). A switchable bypass (11) e.g. internal bypass, bypasses a turbine wheel (19). An additive catalytic converter (16) is arranged in the bypass. The bypass is arranged parallel to a wastegate bypass in a turbine housing. The wastegate bypass bypasses the turbine wheel and controls a wastegate valve i.e. wastegate flap. The additive catalytic converter has smaller thermal mass than that of the catalytic converter of the exhaust system. The catalytic converter of the exhaust system and the additive catalytic converter are designed as an oxidation catalytic converter or three-way catalytic converter.