Exhaust aftertreatment supplying a reducing agent
First Claim
Patent Images
1. A diesel-powered vehicle exhaust fluid (DEF) generating system, the system comprising:
- (a) a diesel exhaust fluid (DEF) mixing subsystem comprising a first tank, a second tank, and a nitrogen-oxides (NOx) reductant dispenser configured to controllably provide concentrated NOx reductant to the first tank and the second tank;
(b) a water source configured to provide water to the first tank, until the first tank is filled to a first fill volume, and then to the second tank; and
(c) a dosing subsystem in fluid communication with the DEF mixing subsystem, wherein the dosing subsystem is configured to receive DEF from the first tank, until the first tank is empty, and then to receive DEF from the second tank,wherein the DEF mixing subsystem, the water source, and the dosing subsystem are onboard the diesel-powered vehicle.
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Abstract
The present disclosure relates to on-vehicle systems and methods for mixing an NOx reductant solution from a concentrated source of NOx reductant and water. The mixed DEF is then used to treat exhaust from the vehicle to reduce pollutants.
39 Citations
21 Claims
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1. A diesel-powered vehicle exhaust fluid (DEF) generating system, the system comprising:
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(a) a diesel exhaust fluid (DEF) mixing subsystem comprising a first tank, a second tank, and a nitrogen-oxides (NOx) reductant dispenser configured to controllably provide concentrated NOx reductant to the first tank and the second tank; (b) a water source configured to provide water to the first tank, until the first tank is filled to a first fill volume, and then to the second tank; and (c) a dosing subsystem in fluid communication with the DEF mixing subsystem, wherein the dosing subsystem is configured to receive DEF from the first tank, until the first tank is empty, and then to receive DEF from the second tank, wherein the DEF mixing subsystem, the water source, and the dosing subsystem are onboard the diesel-powered vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 21)
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16. A method of forming diesel exhaust fluid (DEF) onboard a diesel-powered vehicle having a DEF-generating system, the method comprising:
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(a) filling a first tank with water to a predetermined first fill volume; (b) filling a second tank with water after the first tank is filled to the first fill volume; (c) dispensing a predetermined first amount of concentrated NOx reductant from a NOx reductant dispenser into the first fill volume of water of the first tank and the second tank to provide DEF of a predetermined concentration; and (d) directing the DEF from the first tank into a DEF dosing system until the first tank is empty and then directing DEF from the second tank into the DEF dosing system. - View Dependent Claims (17, 18, 19, 20)
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Specification