Patent ID: 11885253
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 19:
20. A method of controlling light-off of a catalytic converter in an exhaust system of an internal combustion engine (ICE), the method comprising:
identifying, via an electronic controller, a start of the ICE requiring a light-off of the catalytic converter;
regulating an exhaust-flow control valve, via the electronic controller, to increase exhaust gas backpressure in the exhaust system in response to the identified start of the ICE;
regulating combustion inside the ICE, via the electronic controller, to increase enthalpy of the ICE following the regulating of the exhaust-flow control valve to increase exhaust gas backpressure regulates at least one of temperature and mass of exhaust gas flow from the ICE into the exhaust system;
detecting, via the electronic controller, the light-off of the catalytic converter;
regulating the exhaust-flow control valve, via the electronic controller, to decrease the exhaust gas backpressure in the exhaust system in response to the detected light-off of the catalytic converter; and
regulating combustion inside the ICE, via the electronic controller, to decrease enthalpy of the ICE in response to the detected light-off of the catalytic converter following the regulating of the exhaust-flow control valve to decrease the exhaust gas backpressure regulates at least one of temperature and mass of exhaust gas flow from the ICE into the exhaust system.