CPC F02D 9/04 (2013.01) [F01N 3/20 (2013.01); F02D 41/042 (2013.01); F02D 41/064 (2013.01); F02D 41/123 (2013.01); F01N 2430/10 (2013.01); F02D 2200/0802 (2013.01)] | 20 Claims |
1. 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 catalyst;
an exhaust throttle valve disposed in the exhaust system;
an actuator configured 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 actuator to control emissions from the exhaust system during a cold start and after deceleration fuel cutoff events by reducing exhaust flow during the deceleration fuel cutoff events.
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