US Patent 11448114 Exhaust tract for a combustion engine

An exhaust tract for an internal combustion engine. The exhaust tract has a pipe which is connected for through flow to an exhaust manifold of the internal combustion engine. The exhaust line includes, downstream of the exhaust manifold, a purification unit for reducing pollutant emissions of the internal combustion engine. The purification unit includes at least one catalytic converter, an electrically heatable heating catalytic converter and a supporting catalytic converter supporting the heating catalytic converter. The heating catalytic converter and the supporting catalytic converter are of annular design. The heating catalytic converter is designed for a 48 volt power supply in order to reduce single-cylinder lambda effects.