Air driven reductant dosing system

Inactive Publication Date: 2014-12-04
QI BAOHUA +1
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Benefits of technology

[0016]In reductant dosing control, the pressure sensor is used in a three-stage PWM controller, which generates a PWM signal for driving the injector according to predetermined dosing commands. In the three-stage PWM controller, the first stage control creates a first-stage PWM signal by periodically setting control parameters to the second stage controller, which generates a second-stage PWM signal, while the control pa

Problems solved by technology

In lean combustion engines, due to the existence of large amount oxygen excess, passive means without extra dosing agents, such as that using a three-way catalyst, normally are not able to effectively remove the oxidative specie NOx, as that in most of spark-ignition engines.
However, due to safety concerns and difficulties in handling pure ammonia, normally urea solution is used in ammonia SCR systems.
The requirements of a continuous air flow and a precisely controlled metering pump limit the application of this method.
However, in this method, due to

Method used

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Embodiment Construction

[0038]Referring to FIG. 1, in an engine aftertreatment system, exhaust gas generated by an engine 100 enters a passage 166 through a manifold 101. On the passage 166, a reductant injector 130 is installed. The solenoid valve of the injector 130 is controlled by a Dosing Control Unit (DCU) 140 through signal lines 145 connected to a port 136. And reductant is provided by a redutant supply module 110 through a pressure line 131 fluidly connected to a port 133. To avoid damages caused by high temperature exhaust gas, engine coolant is cycled from an inlet port 134 to an outlet port 135. The reductant injected from the injector 130 mixes with exhaust gas, and through a mixer and diffuser 161, the result gas enters a catalyst 163, where SCR reactions reduce NOx in the exhaust gas.

[0039]The reductant supply module 110 has a port 115 fluidly connected to the port 133 of the injector 130 with the line 131 for providing pressurized reductant supply to the injector. A pressure sensor (not sho...

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Abstract

A dosing system for delivering reductant into an exhaust gas treatment system of an internal combustion engine using an air driven hydraulic pump, which includes a pressure pump tank and a liquid supply tank, for closed-loop controlling reductant pressure, and a three-stage PWM control method for dosing rate control. Reductant residue in the dosing system is purged by using compressed air, and when the air driven hydraulic pumps is positioned inside a reductant tank, heating means in the reductant tank can also be used for heating the air driven hydraulic pump. The closed-loop pressure control together with the three-stage PWM control allow dosing accuracy insensitive to pressure variations in compressed air, thereby a variety of compressed air sources can be used.

Description

[0001]This present application claims priority from U.S. provisional application No. 61 / 689,517 having the same title as the present invention and filed on Jun. 7, 2012.TECHNICAL FIELD OF THE INVENTION[0002]The present invention relates to an apparatus and method for delivering reductant into an exhaust gas treatment system of an internal combustion engine for removing regulated species in exhaust gas, and more specifically, to an apparatus and method using an air driven hydraulic pump to deliver liquid reducing agents into an exhaust gas treatment system of an internal combustion engine.BACKGROUND OF THE INVENTION[0003]Environmentally harmful species in the exhaust gas emitted from an internal combustion engine, such as hydrocarbons (HC), carbon monoxide (CO), particulate matters (PM), and nitric oxides (NOx) are regulated species that need to be removed from the exhaust gas. In lean combustion engines, due to the existence of large amount oxygen excess, passive means without extra...

Claims

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Application Information

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IPC IPC(8): F01N3/10
CPCF01N3/10F01N3/2066F01N3/208F01N2610/02F01N2610/08F01N2610/1406F01N2610/1466F01N2610/1493F01N2900/0422F01N2900/1808F01N2900/1821Y02T10/12
Inventor QI, BAOHUAYAN, MI
Owner QI BAOHUA
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