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Method of estimating sulphur release from lean NOx trap of internal combustion engine

A technology of nitrogen oxides and traps, which is applied in the direction of internal combustion piston engines, combustion engines, chemical instruments and methods, etc., can solve the problems affected by the duration of rich oil, etc., and achieve an easy-to-manage effect

Inactive Publication Date: 2014-05-07
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The sulfur stored in the LNT is only removed during rich conditions, but the problem is that during desulfurization regeneration, the sulfur release is not only affected by the rich duration, but even by the operating conditions

Method used

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  • Method of estimating sulphur release from lean NOx trap of internal combustion engine
  • Method of estimating sulphur release from lean NOx trap of internal combustion engine
  • Method of estimating sulphur release from lean NOx trap of internal combustion engine

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Embodiment Construction

[0124] Some embodiments may include automotive systems 100 such as figure 1 and 2 As shown in , an automotive system 100 includes an internal combustion engine (ICE) 110 having an engine block 120 defining at least one cylinder 125 having a piston 140 connected for rotating a crankshaft 145 . Cylinder head 130 cooperates with piston 140 to define combustion chamber 150 . A fuel and air mixture (not shown) is disposed in combustion chamber 150 and ignited, resulting in thermal expansion of exhaust gases that cause piston 140 to reciprocate. Fuel is provided by at least one fuel nozzle 160 and air is provided via at least one intake port 210 . Fuel is provided to fuel nozzles 160 at high pressure from a fuel rail 170 in fluid communication with a high pressure fuel pump 180 that increases the pressure of fuel received from a fuel source 190 . Each of the cylinders 125 has at least two valves 215 actuated by a camshaft 135 which rotates with timing with the crankshaft 145 . V...

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Abstract

A method of estimating the sulphur release during a desulphation process of a lean NOx trap (281) based on a space velocity (10), a catalyst temperature (11), an air / fuel ratio (12) and a DeSOx rich time duration (13) comprises the steps that a plurality of regression coefficients (2200) are provided, a line segment (2300) is modeled, and a sulphur release quantity (2400) is calculated in percentage.

Description

technical field [0001] The present invention relates to a method for evaluating desulfurization from a lean nitrogen oxide trap (LNT) of an internal combustion engine. In particular, the method evaluates the sulfur release during the regeneration (desulfurization (DeSOx)) of an LNT located in the exhaust system of an internal combustion engine. Background technique [0002] It is known that an exhaust aftertreatment system of a diesel engine can be provided with devices such as a lean nitrogen oxide trap (Lean Nox Trap, hereinafter also referred to as LNT). [0003] The LNT is provided for trapping nitrogen oxides NOx contained in the exhaust gas and is located in the exhaust line. [0004] LNTs are catalytic devices comprising catalysts such as rhodium, platinum and palladium and absorbers such as barium-based components that provide active sites suitable for binding nitrogen oxides (NOx) contained in exhaust gas to Traps it within the device itself. [0005] Dilute NOx ...

Claims

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Application Information

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IPC IPC(8): F01N11/00
CPCF02D2200/0802F02D41/1456F01N3/0885F02D41/028B01D53/9422F02D2200/0818B01D53/9431Y02T10/12
Inventor R.阿戈里尼A.达托A.维蒂洛S.瓦尔加尼拉
Owner GM GLOBAL TECH OPERATIONS LLC