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US 2010/0058738 A1Published application
Engine Idling Duration Control
AssigneeFord Global Technologies, LLC
InventorsTimothy Webb, Michiel J. Van Nieuwstadt, John Paul Bogema, Christopher Oberski
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Abstract
Systems and methods are described for controlling an engine in a vehicle. One example method includes, after a threshold duration of engine idling, continuing engine idle operation when an exhaust NOx sensor indicates a NOx level below a NOx threshold, and stopping engine idle and shutting down the engine when the exhaust NOx sensor indicates the NOx level is above the NOx threshold.
Claims15
A method for controlling an engine in a vehicle, comprising:
- after a threshold duration of engine idling, continuing engine idle operation when an exhaust NOx sensor indicates a NOx level below a NOx threshold, and stopping engine idle and shutting down the engine when the exhaust NOx sensor indicates the NOx level is above the NOx threshold.
A method comprising:
- during a first operating mode, shutting down a diesel engine from idle after a threshold duration of idling operation when said diesel engine emits NOx emissions above a threshold value;
- and
- during a second operating mode, continuing to run the diesel engine in idle after the threshold duration of idling operation when said diesel engine emits NOx emissions below the threshold value.
A system in a vehicle comprising:
- a diesel engine having an exhaust;
- at least SCR catalyst coupled to said exhaust downstream of said engine;
- a reductant delivery system coupled to said exhaust and configured to deliver reductant to the SCR catalyst;
- a NOx sensor coupled to said exhaust downstream of said at least one NOx mitigating device;
- and
- a control system configured to delivery reductant to the SCR catalyst at least during non-idling conditions, monitor a duration of continuous engine idling, and during the duration of continuous engine idling, continue engine idle operation when the exhaust NOx sensor indicates a NOx level below a threshold, and shutting down the engine when the exhaust NOx sensor indicates the NOx level is above the threshold and when the monitored duration of continuous idling at NOx levels above the threshold is greater than a threshold duration, the control system further configured to adjust engine operation to take mitigating action to reduce NOx emissions below the threshold in response to the NOx sensor indication that the NOx level is above the threshold.
3 more elements
Dependencies are inferred from the claim text.