Control method for temporarily increasing the exhaust gas temperature
AssigneeFord Global Technologies, LLC
InventorsChristian Winge Vigild, Johannes Kuenstler, Daniel Roettger, Evangelos Karvounis
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Abstract
The invention relates to a control method for increasing the exhaust gas temperature of an internal combustion engine, which has at least one exhaust gas aftertreatment device in its exhaust tract, and which has an exhaust gas recirculation system, to which a regulating system is assigned. In order to increase the temperature of the exhaust gas and avoid engine oil dilution due to retarded post-injections, the regulating system increases the exhaust gas back-pressure while maintaining an exhaust gas recirculation rate, and increases a fuel injection quantity into the combustion chamber during the main injection.
Claims8
A system for increasing a temperature of an exhaust gas of an internal combustion engine, comprising:
- at least one exhaust gas aftertreatment device coupled downstream of the engine;
- an exhaust gas recirculation system comprising:
- an exhaust gas recirculation valve;
- and
- a regulating system for controlling an exhaust gas backpressure;
- and
- a control device for increasing said exhaust gas backpressure while maintaining a substantially constant exhaust gas recirculation rate, said control device increasing a fuel injection quantity into a combustion chamber of the engine during a main injection event.
A method for increasing a temperature of an exhaust gas aftertreatment device for an internal combustion engine, the engine having an exhaust gas recirculation system capable of controlling an exhaust gas back-pressure and an exhaust gas recirculation rate, the method comprising:
- increasing the exhaust gas backpressure while maintaining a substantially constant exhaust gas recirculation rate;
- and
- increasing a fuel injection quantity into a combustion chamber of the engine during a main injection event.
Dependencies are inferred from the claim text.