Dual catalyst heating system
AssigneeFord Global Technologies, LLC
InventorsMario Balenovic, Felix Goebel, Matthew Allen Schneider, Martina Reichert, Frederik De Smet, Peter Ross
Life of this patent
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Abstract
Methods and systems are provided for an exhaust gas aftertreatment system for a combustion engine in a motor vehicle. In one example, the exhaust gas aftertreatment comprises at least two catalyst devices arranged in an exhaust tract, and a feed device for a reducing agent arranged between the two catalysts, and which furthermore comprises a first heat device at the inlet of the first catalyst and a second heat device downstream thereof, the system adapted for the reduction of nitrogen oxides.
Claims19
A system for exhaust gas aftertreatment of a combustion engine in a motor vehicle, comprising:
- an exhaust tract;
- a first catalyst device arranged in the exhaust tract;
- a second catalyst device arranged downstream of the first catalyst device in the exhaust tract;
- a feed device for injecting a reducing agent arranged in between the first and second catalyst devices;
- a first heat device arranged at an inlet of the first catalyst device and a second heat device arranged downstream of the first catalyst device;
- and
- a control device, wherein the control device is configured with computer readable instructions stored on non-transitory memory for:
- responsive to a temperature of exhaust at the first catalyst being lower than a first threshold, actuating the first heat device;
- and
- responsive to the temperature of exhaust at the first catalyst being higher than the first threshold, injecting an amount of the reducing agent and actuating the second heat device.
A method for exhaust gas aftertreatment, comprising:
- following an engine start,
- switching on a first heat device coupled to an inlet of a first catalyst, the first catalyst arranged upstream of a second catalyst in an exhaust passage;
- and
- when an exhaust temperature reaches a first temperature threshold value,
- introducing, via a feed device, a reducing agent into the exhaust passage between the first and second catalysts;
- and
- switching on a second heat device coupled to an outlet of the first catalyst.
A method for an engine exhaust, comprising:
- responsive to an engine cold-start condition,
- actuating a first heater coupled to an inlet of a first exhaust oxidation catalyst to raise an exhaust temperature, the first catalyst arranged upstream of a second selective reduction catalyst;
- and
- responsive to the exhaust temperature exceeding a first threshold,
- actuating a second heater coupled to an outlet of the first exhaust oxidation catalyst while injecting an amount of reducing agent, rearwards, onto the outlet of the first catalyst, a direction of the injecting opposite to a direction of exhaust flow.
Dependencies are inferred from the claim text.