Reagent doser diagnostic system and method
A diagnostic system and diagnostic method technology, applied in the direction of chemical instruments and methods, separation methods, diagnostic devices for exhaust gas treatment devices, etc.
Active Publication Date: 2015-04-29
CUMMINS EMISSION SOLUTIONS
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Problems solved by technology
However, this technology comes at an additional expense, which includes the initial hardware cost of the reagent dosing system as well as long-term maintenance and upkeep costs
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[0009] For the purposes of promoting an understanding of the principles of the invention, references will be made in the drawings of the detailed description and specific language will be used to explain the same. However, it can be understood that this does not mean any limitation to the protection scope of the present invention, any changes and further modifications to the specific embodiments, and as those skilled in the art related to the present invention would normally make, specific to the present invention Any further applications of the principles of the invention described in the embodiments are contemplated here.
[0010] refer to figure 1 , which shows a schematic diagram of reagent dosing diagnosis system 100 injecting reagent into exhaust aftertreatment system 130 . The reagent dosing diagnostic system 100 may be used in a vehicle (not shown) powered by an internal combustion engine 120, such as a diesel engine, or in an engine used in other applications such as...
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Systems and methods are disclosed for determining or diagnosing a reagent dosing system failure to provide sufficient reagent to an exhaust aftertreatment system that includes an SCR catalyst to satisfy a reagent dosing command. The method comprises injecting a quantity of a reagent with a dosing system over a dosing cycle in response to a dosing command to treat an exhaust gas in an exhaust system that includes a selective catalytic reduction catalyst, wherein the dosing system includes a pump operating via feedback control to maintain a generally stable pressure of the reagent downstream of the pump during the dosing cycle, wherein injecting the quantity of the reagent includes: suspending pressure feedback control of the pump during a diagnostic dosing period within the dosing cycle while maintaining a pump speed; injecting a portion of the quantity of the reagent while suspending pressure feedback control during the diagnostic dosing period; and determining a fault condition of the dosing system in satisfying the dosing command in response to a pressure drop of the dosing system during the diagnostic dosing period.
Description
Background technique [0001] Selective catalytic reduction (SCR for short) exhaust aftertreatment system is an important technology for reducing NOx emissions from internal combustion engines (such as diesel engines). The SCR system generally includes a reagent source (such as a urea culture solution), a reagent dosing system and an injector, wherein the reagent dosing system is used to pressurize the urea culture solution and control the speed at which the urea culture solution is supplied to the SCR catalyst Or the total amount, while the injector is used to deliver the urea culture solution to the urea decomposition area in the exhaust runner located upstream of the SCR catalyst. Many SCR systems also utilize high pressure gas to assist the flow of urea inoculum into the injector. [0002] While the NOx emissions are significantly reduced, the SCR system also has some disadvantages and problems. The use of urea broth in SCR systems may lead to the growth of urea crystals o...
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Login to View More IPC IPC(8): F01N11/00
CPCF01N3/208F01N11/00F01N2550/05F01N2610/02F01N2900/1808F01N2900/1822Y02T10/12Y02T10/40F01N3/20B01D53/9495
Inventor 巴尔巴哈迪尔·辛格克莱德W·席米基R·麦克丹尼尔齐宝华保罗C·麦卡沃伊
Owner CUMMINS EMISSION SOLUTIONS