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Method for monitoring urea quality of an scr system

A technology of SCR system and urea, which is applied in the direction of diagnostic devices, instruments, and indirect flow characteristic measurement of exhaust gas treatment devices, and can solve problems such as increasing the overall cost of the SCR system, difficult to arrange and use sensors, and significant packaging space for sensors

Inactive Publication Date: 2015-10-07
PLASTIC OMNIUM ADVANCED INNOVATION & RES SA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] A drawback of these known urea quality sensors is that these sensors generally require significant packaging space
Also, there is no dedicated space and electrical connections for these urea quality sensors in existing SCR systems, making it difficult to place and use these sensors in
Another limitation is that the use of urea quality sensors results in increased overall cost of the SCR system

Method used

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  • Method for monitoring urea quality of an scr system
  • Method for monitoring urea quality of an scr system
  • Method for monitoring urea quality of an scr system

Examples

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Embodiment Construction

[0048] exist Figure 1 to Figure 5 The same reference numerals are used in , respectively, to denote the same elements (or functionally similar elements).

[0049] figure 1 A specific embodiment of an SCR system to which the present invention may be applied is shown.

[0050] The SCR system comprises a urea tank 1 containing a urea solution. The urea storage tank 1 is equipped with the following components:

[0051] - Gauge 2 (i.e. liquid level sensor);

[0052] - heating element 3;

[0053] -filter4;

[0054] - temperature sensor 5; and

[0055] - Current sensor 6 for the heating element.

[0056] The urea solution is delivered by the action of the pump 7 to an injection device 12 located upstream of the SCR catalyst 17 in the line 11 for exhausting the vehicle's engine. The pump 7 is driven by a BLDC motor 15, controlled by a controller (not shown). The controller is able to receive the signal measured by the pressure sensor 10 (which relates to the output pressure ...

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Abstract

A method for monitoring urea concentration and quality in a urea solution stored in a tank of an SCR system. The system comprising a pump driven by a motor and the pressure of which is controlled by a controller. The method comprises the steps of: - measuring a parameter value characteristic of the energy transmitted by the motor to the pump; - determining a urea concentration value based upon the parameter value characteristic of the energy transmitted by the motor to the pump.

Description

technical field [0001] The invention relates to a method for determining the quality of a fluid. In particular, the invention relates to a method for sensing the concentration / quality of urea in a urea solution stored in a tank of an SCR system. Background technique [0002] Regulations on emissions from vehicles and heavy goods vehicles include the reduction of nitrogen oxides (NO) x emissions to the atmosphere. A known way of achieving this is to use the Selective Catalytic Reduction ("Selective Catalytic Reduction" in English, abbreviated as SCR) process, which allows the reduction of Reduce nitrogen oxides. The ammonia may come from thermal decomposition of an ammonia precursor solution, and the concentration of the ammonia precursor solution may be a eutectic concentration. The ammonia precursor is generally a urea solution. [0003] Large amounts of NO produced when combusted with optimum efficiency in the engine by using the SCR process x It is processed in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20G01N11/00
CPCF01N3/208F01N3/2066F01N2550/05F01N2610/02F01N2610/1406F01N2610/144F01N2610/148F01N2900/1808F01N2900/1818F01N2900/1822G01N2011/0053Y02T10/24G01N2011/006Y10T137/0335Y10T137/85986Y02T10/12F01N11/00G01N11/00F01N2900/0412
Inventor J·E·汤姆逊让-克罗德·阿布姆汉伊乔希·巴特勒斯蒂芬·伦纳德弗雷德里克·让诺
Owner PLASTIC OMNIUM ADVANCED INNOVATION & RES SA
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