Method for purging a dosing system
First Claim
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1. An emissions reduction system, comprising:
- an injector configured to dispense reductant into an exhaust system;
a pump configured to provide the reductant to the injector through a first passageway; and
a pressurized fluid tank fluidly connected to the injector through a second passageway and configured to urge a purge flow including the reductant combined with a pressurized fluid from the injector, through the pump, and to a reductant source,wherein the second passageway joins the first passageway at the injector.
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Abstract
A method for purging reductant from a reductant supply system is disclosed. The method includes dispensing reductant into an exhaust system via a dispensing device. The method also includes purging the dispensing device by urging reductant from the dispensing device to a reductant source.
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Citations
21 Claims
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1. An emissions reduction system, comprising:
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an injector configured to dispense reductant into an exhaust system; a pump configured to provide the reductant to the injector through a first passageway; and a pressurized fluid tank fluidly connected to the injector through a second passageway and configured to urge a purge flow including the reductant combined with a pressurized fluid from the injector, through the pump, and to a reductant source, wherein the second passageway joins the first passageway at the injector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for purging reductant from a reductant supply system, comprising:
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dispensing reductant into an exhaust system with a pump configured to drive the reductant through an injector, the injector having; a fluid receiving end, and a fluid injecting end for injecting the reductant; purging the injector by urging the reductant from the injector to a reductant source using a pressurized gas that mixes with the reductant at the injector to form a purge flow,wherein the pressurized gas enters the injector through the fluid receiving end prior to mixing with the reductant; and purging the pump with the purge flow from the injector. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for purging reductant from a reductant supply system, comprising:
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providing a flow of supply reductant in a first direction through a passage of a dispensing device of the supply system; providing a flow of pressurized air to the dispensing device to purge reductant from the dispensing device in a second direction through the passage, the second direction being opposite to the first direction; and directing the flow of purged reductant from the dispensing device to an inlet of a pump that provides the flow of supply reductant, and then through the pump to an outlet of the pump, and directing the flow of purged reductant to a reductant source, wherein directing the flow of purged reductant from the dispensing device to the inlet of the pump includes blocking the flow of purged reductant to the outlet of the pump and directing the flow of purged reductant to the inlet of the pump by a bypass passage. - View Dependent Claims (18, 19, 20, 21)
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Specification