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Method for controlling injection of diesel exhaust fluid into exhaust pipe of internal combustion engine

A fluid injection, internal combustion engine technology, applied to internal combustion piston engines, electronic control of exhaust gas treatment devices, and diagnostic devices of exhaust gas treatment devices, etc., can solve problems such as reducing conversion efficiency, and achieve the effect of saving DEF and reducing DEF consumption.

Inactive Publication Date: 2011-11-23
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] This open-loop procedure usually results in optimized DEF consumption but lower SCR NO X Conversion efficiency

Method used

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  • Method for controlling injection of diesel exhaust fluid into exhaust pipe of internal combustion engine
  • Method for controlling injection of diesel exhaust fluid into exhaust pipe of internal combustion engine
  • Method for controlling injection of diesel exhaust fluid into exhaust pipe of internal combustion engine

Examples

Experimental program
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Effect test

Embodiment Construction

[0100] Embodiments of the invention will be disclosed by means of an internal combustion engine 10 of a motor vehicle, in particular a diesel engine.

[0101] The engine 10 is typically equipped with an intake pipe 20 for supplying fresh air to the engine cylinders; an exhaust pipe 30 for discharging exhaust gas from the engine cylinders to the environment; and a number of aftertreatment devices positioned in the exhaust pipe 30 , so that pollutants from the exhaust are degraded and / or removed before being released to the environment.

[0102] In more detail, the exhaust pipe 30 is provided with a diesel oxidation catalyst (DOC) 31 for oxidizing hydrocarbons (HC) and carbon monoxide (CO) into carbon dioxide (CO) 2 ) and water (H 2 O); a diesel particulate filter (DPF) 32 positioned downstream of DOC 31 for removing diesel particulate matter or soot from the exhaust; and a selective reduction catalyst (SCR) 33 positioned downstream of DPF 32 for removing diesel particulate mat...

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PUM

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Abstract

A method is provided for controlling injection of Diesel Exhaust Fluid into an exhaust pipe (30) of an internal combustion engine (10) equipped with a Selective Reduction Catalyst. The method includes, but is not limited to monitoring a value of a control parameter influencing an operation of the Selective Reduction Catalyst (33), injecting a quantity of Diesel Exhaust Fluid, controlling the quantity of Diesel Exhaust Fluid (QDEF) to be injected employing a closed loop procedure or an open loop procedure, switching between the closed loop procedure and the open loop procedure, when value of the control parameter crosses a first threshold value of the control parameter.

Description

technical field [0001] The present invention relates to a method for controlling the injection of diesel exhaust fluid (Diesel Exhaust Fluid, DEF) into the exhaust pipe of an internal combustion engine (usually a diesel engine). Background technique [0002] Diesel engines are typically equipped with an aftertreatment system that includes: an exhaust pipe for directing exhaust gas from the engine to the environment; and a plurality of aftertreatment devices positioned in the exhaust pipe for directing exhaust gas from the exhaust gas of pollutants are degraded and / or removed before being released into the environment. [0003] In more detail, conventional aftertreatment systems typically include a diesel oxidation catalyst (DOC) for oxidizing hydrocarbons (HC) and carbon monoxide (CO) to carbon dioxide (CO). 2 ) and water (H 2 O); and a Diesel Particulate Filter (DPF), positioned in the exhaust pipe downstream of the DOC, for removing diesel particulate matter or soot from...

Claims

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Application Information

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IPC IPC(8): F01N9/00F01N11/00
CPCF01N2560/07Y02T10/24F01N3/208F01N2610/00F01N2560/026F01N2560/06Y02T10/12F01N3/2066F01N2610/02
Inventor 伊戈尔.扎尼蒂埃米利亚诺.桑蒂洛
Owner GM GLOBAL TECH OPERATIONS LLC
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