Patent ID: 11913401
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 10:
11. An engine emission control system, comprising:
an engine configured to consume fuel and air to generate an exhaust gas stream;
an exhaust system configured to channel the exhaust gas stream from the engine to a tailpipe;
an aftertreatment system in the exhaust system, the aftertreatment system including a catalytic converter containing a catalyst;
an exhaust throttle valve disposed in the exhaust system, the exhaust throttle valve configured to generate a backpressure in the exhaust system during cold start and deceleration fuel cutoff events;
an actuator configured to control an amount of air going through the engine, the actuator comprising at least one of an intake throttle, an intake valve phaser, and an exhaust valve phaser; and
a controller configured to operate at least one of the exhaust throttle valve and the actuator to control emissions from the exhaust system during a cold start and after the deceleration fuel cutoff events by reducing exhaust flow during the deceleration fuel cutoff events.