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US 10,823,032 B2Granted
Mixer system proximate to vehicle engine
AssigneeFaurecia Emissions Control Technologies, USA, LLC
InventorsRobin H. Willats, Adam Mathews, John Rohde, Alfred N. Tucker
Life of this patent
Estimating the term…
Abstract
An automotive vehicle includes an exhaust aftertreatment system. The exhaust aftertreatment system includes a mixer, a doser that injects a reducing agent into the mixer, and a selective catalytic reduction unit. The exhaust aftertreatment system mixes exhaust gases and the reducing agent for treatment prior to the exhaust gases being discharged into the atmosphere. Some components of the exhaust aftertreatment system are positioned proximate to an associated combustion engine to minimize thermal energy loss from the exhaust gases prior to interaction with the exhaust aftertreatment system.
Claims20
An over the road vehicle comprising:
- a vehicle body defining an engine compartment,
- a combustion engine mounted in the engine compartment, and
- a vehicle exhaust system including a close coupled NOx reduction unit fluidly coupled to the combustion engine to receive exhaust gases discharged from the combustion engine, the close coupled NOx reduction unit including a mixer coupled to receive exhaust gases from the combustion engine, a doser configured to inject reducing agent into the mixer so as to induce mixing of the exhaust gases with reducing agent in the mixer, and a selective catalytic reduction unit housing a catalyst that encourages chemical reaction between the exhaust gases and the reducing agent so as to reduce the amount of NOx in the exhaust gases,
- wherein the close-coupled NOx reduction unit is mounted in the engine compartment with the combustion engine so that energy in the exhaust gases is not dissipated during transport of the exhaust gases out of the engine compartment before the exhaust gases chemically react with the reducing agent and the catalyst thereby further encouraging chemical reaction, and
- wherein the vehicle exhaust system includes a remote gas treatment unit fluidly coupled to the close-coupled NOx reduction unit to receive exhaust gases from the close coupled NOx reduction unit, the remote gas treatment unit includes a particulate filter, and the remote gas treatment unit is located outside the engine compartment.
2 more elements
An over the road vehicle comprising
- a vehicle body including an engine compartment,
- a combustion engine mounted in the engine compartment, and
- a vehicle exhaust system including a close coupled NOx reduction unit fluidly coupled to the combustion engine to receive exhaust gases discharged from the combustion engine, the close coupled NOx reduction unit including a mixer arranged to receive exhaust gases from the combustion engine, a doser configured to inject reducing agent into the mixer so as to induce mixing of the exhaust gases with reducing agent in the mixer, and a selective catalytic reduction unit housing a catalyst that encourages chemical reaction between the exhaust gases and the reducing agent so as to reduce the amount of NOx in the exhaust gases,
- wherein the closed-coupled NOx reduction unit is arranged to axially overlap with the combustion engine along a lengthwise axis of the vehicle that extends from a front of the vehicle to a rear of the vehicle so that temperature of the exhaust gases is not dissipated during excess transport of the exhaust gases along the lengthwise axis away from the combustion engine before the exhaust gases chemically react with the reducing agent and catalyst thereby further encouraging chemical reaction, and
- wherein the vehicle exhaust system includes a remote gas treatment unit fluidly coupled to the close-coupled NOx reduction unit to receive exhaust gases from the close coupled NOx reduction unit, the remote gas treatment unit includes a particulate filter, and the remote gas treatment unit is located outside the engine compartment.
2 more elements
An over the road vehicle comprising:
- a vehicle body defining an engine compartment,
- a combustion engine mounted in the engine compartment, and
- a vehicle exhaust system including a close coupled NOx reduction unit mounted in the engine compartment with the combustion engine and a remote gas treatment unit located outside the engine compartment,
- wherein the close coupled NOx reduction unit is fluidly coupled to the combustion engine and includes a mixer configured to receive exhaust gases from the combustion engine and a doser configured to inject reducing agent into the mixer so as to induce mixing of the exhaust gases with reducing agent in the mixer,
- wherein the remote gas treatment unit is fluidly coupled to the close-coupled NOx reduction unit to receive exhaust gases from the close coupled NOx reduction unit, and the remote gas treatment unit includes at least one of a particulate filter and a secondary NOx reduction unit, the secondary NOx reduction unit having a secondary doser configured to inject reducing agent into the exhaust gases and a secondary catalyst that encourages chemical reaction between exhaust gases and the reducing agent in the secondary NOx reduction unit so as to reduce the amount of NOx in the exhaust gases.
2 more elements
Dependencies are inferred from the claim text.