Selective catalyst reduction light-off strategy
AssigneeGM Global Technology Operations LLC
InventorsEugene V. Gonze, Michael J. Paratore, Jr.
Life of this patent
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Abstract
An emissions control system includes a temperature determination module and an emissions control module. The temperature determination module determines a first temperature of a heater element of a diesel particulate filter (DPF) assembly in an exhaust system and determines a second temperature of a catalyst of the DPF assembly. The emissions control module selectively activates the heater element, selectively initiates a predefined combustion process in an engine based upon the first temperature, and selectively starts a reductant injection process based upon the second temperature.
Claims23
A method comprising:
- determining a first temperature of a heater element of a diesel particulate filter (DPF) assembly in an exhaust system;
- determining a second temperature of a catalyst of said DPF assembly;
- selectively activating said heater element;
- initiating a predefined combustion process in an engine when said first temperature is greater than a first temperature threshold;
- and
- selectively starting a reductant injection process based upon said second temperature.
A method comprising:
- determining a first temperature of a heater element of a diesel particulate filter (DPF) assembly in an exhaust system;
- determining a second temperature of a selective catalytic reduction (SCR) catalyst of said DPF assembly;
- selectively activating said heater element;
- selectively initiating a predefined combustion process in an engine based upon said first temperature;
- and
- selectively starting a reductant injection process based upon said second temperature,
- wherein said process provides ammonia (NH3) to said SCR catalyst.
An emissions control system comprising:
- a temperature determination module that determines a first temperature of a heater element of a diesel particulate filter (DPF) assembly in an exhaust system and that determines a second temperature of a catalyst of said DPF assembly;
- and
- an emissions control module that selectively activates said heater element, that selectively initiates a predefined combustion process in an engine when said first temperature is greater than a first temperature threshold, and that selectively starts a reductant injection process based upon said second temperature.
An emissions control system comprising:
- a temperature determination module that determines a first temperature of a heater element of a diesel particulate filter (DPF) assembly in an exhaust system and that determines a second temperature of a selective catalytic reduction (SCR) catalyst of said DPF assembly;
- and
- an emissions control module that selectively activates said heater element, that selectively initiates a predefined combustion process in an engine based upon said first temperature, and that selectively starts a reductant injection process based upon said second temperature,
- wherein said reductant infection process provides SCR catalyst.
Dependencies are inferred from the claim text.