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

Claim 19:
20. A vehicle with 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 catalysts;
an exhaust throttle valve disposed in the exhaust system downstream from the aftertreatment system, the exhaust throttle valve configured to generate a backpressure in the exhaust system during cold start deceleration fuel cutoff events;
an exhaust valve phaser configured to set exhaust valve timing to control an amount of air going through the engine; and
a controller configured to operate at least one of the exhaust throttle valve and the exhaust valve phaser to control emissions from the exhaust system during the cold starts and following the deceleration fuel cutoff events.