A system for recirculating exhaust gas from an internal combustion engine 2, the system comprising an exhaust conduit 3, a first catalyst 21 disposed in exhaust conduit 3 for treating exhaust gas, an electric heating element 20 for heating air in the exhaust conduit 3 upstream of first catalyst 21, a pumping means for pumping air past the electric heating element 20 to preheat the first catalyst 21, and a recirculation line 14, 24, 38 for recirculating the heated air. The present disclosure also relates to a catalyst preheat control unit 29 and to a method of preheating a first catalyst 21. The system aims overcome the limitations of catalysts having high operating temperatures and that may be preheated.
Catalyst preheat control apparatus and method
2020-09-02
Patent
Electronic Resource
English
IPC: | F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / F01N GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL , Schalldämpfer oder Auspuffvorrichtungen für Gase von Kraft- und Arbeitsmaschinen oder von Kraftmaschinen allgemein |
European Patent Office | 2019
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