Exhaust gas recirculation estimation system
AssigneeGM Global Technology Operations LLC
InventorsSherif H. El Tahry, Ognyan N. Yanakiev
Life of this patent
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Abstract
A control system and method for an exhaust gas recirculation (EGR) system of an engine includes a first sensor that senses fresh mass air flow, a second sensor that senses charge air flow, where the charge air flow is based on the fresh mass air flow and EGR exhaust flow, and a calculation module that determines a difference between the fresh mass airflow and the charge air flow and generates an EGR valve control signal based on the difference.
Claims20
A control system for an exhaust gas recirculation (EGR) system of an engine, comprising:
- a first sensor that senses fresh mass air flow;
- a second sensor that senses charge air flow, wherein said charge air flow is based on said fresh mass air flow and EGR exhaust flow;
- and
- a calculation module that determines a difference between said fresh mass airflow and said charge air flow and generates an EGR valve control signal based on said difference.
A control method for an exhaust gas recirculation (EGR) system of an engine, comprising:
- sensing fresh mass air flow to the engine;
- sensing charge air flow to the engine;
- and
- determining a difference between said fresh mass airflow and said charge air flow and generating an EGR valve control signal based on said difference, wherein said charge air flow is based on said fresh air flow and EGR exhaust flow.
A control system for an exhaust gas recirculation (EGR) system of an engine, comprising:
- an engine coolant temperature sensor that senses a temperature of an engine coolant (Tcool);
- an EGR temperature sensor that senses a temperature of EGR exhaust (Texhaust);
- and
- a bypass module that controls a bypass valve that selectively directs a portion of said EGR exhaust through a bypass conduit based on an at least one of said Tcool and said Texhaust.
Dependencies are inferred from the claim text.