Engine emission control systems for deceleration fuel cutoff events and cold starts
AssigneeGM Global Technology Operations LLC
InventorsChengke Liu, Vijay A Ramappan, Rafat F Hattar, Jeffrey M Kaiser, Joseph Shelton
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Abstract
An engine consumes fuel and air to generate an exhaust gas stream. An exhaust system channels the exhaust gas stream from the engine to a tailpipe. An aftertreatment system is included in the exhaust system and includes a catalyst. An exhaust throttle valve is disposed in the exhaust system downstream from the aftertreatment system. An actuator controls an amount of air pumped through the engine. A controller operates the exhaust throttle valve and/or the actuator to control emissions from the exhaust system during a cold start and following a deceleration fuel cutoff event.
Claims20
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.
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.
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.
Dependencies are inferred from the claim text.