The invention relates to a method of reducing cold start emissions in a series mode hybrid electric vehicle, comprising an internal combustion engine with an exhaust duct having a catalyst and an oxygen sensor downstream of the catalyst, an output of the combustion engine being connected to an electric generator with a power output of at least 10 kW, that is connected to an electric motor which is coupled to a drive shaft of two or more wheels. The method comprises the steps of:- detecting a cold start condition,- injecting fuel into the combustion engine such that combustion at a lambda value, λ, is achieved for which λ >1, preferably 1< λ < 2, more preferably at a λ of about 1.4,- running the combustion engine at a speed of 1000 rpm or higher, preferably 1500 < rpm < 4000, more preferably at a speed of about 2500 rpm,- determining if the efficiency of the catalyst reaches a predetermined first level,- setting λ to about 1 after the predetermined efficiency level of the catalyst has been reached, and- reducing the engine speed to working conditions when the catalyst efficiency reaches a predetermined second level.
METHOD OF REDUCING COLD START EMISSIONS IN HYBRID ELECTRIC VEHICLES
VERFAHREN ZUR REDUZIERUNG DER KALTSTARTEMISSIONEN BEI HYBRID-ELEKTROFAHRZEUGEN
PROCÉDÉ DE RÉDUCTION DES ÉMISSIONS DE DÉMARRAGE À FROID DANS DES VÉHICULES ÉLECTRIQUES HYBRIDES
02.11.2022
Patent
Elektronische Ressource
Englisch
IPC: | F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / 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 |
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