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Method for measuring the temperature of a medium and temperature sensor

A temperature sensor, medium temperature technology, applied in the application of thermometers, thermometers, measuring devices, etc., can solve problems such as failure of temperature sensors

Inactive Publication Date: 2012-02-08
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Since the reducing agent is a corrosive solution, the temperature sensor in the tank is subjected to a high load and thus the temperature sensor can fail

Method used

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  • Method for measuring the temperature of a medium and temperature sensor
  • Method for measuring the temperature of a medium and temperature sensor
  • Method for measuring the temperature of a medium and temperature sensor

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Embodiment Construction

[0038] figure 1 A schematic diagram of known components of an SCR catalytic converter system is shown. An SCR catalytic converter 12 is arranged in the exhaust gas line 10 of the internal combustion engine 11 . This catalyst selectively reduces nitrogen oxides in the exhaust gas through selective catalytic reduction (SCR). In this reaction ammonia (NH 3 ) as a reducing agent. Since ammonia is a toxic substance, this substance is obtained from the non-toxic carrier substance urea. Urea is injected as required into the exhaust gas line 10 upstream of the SCR catalytic converter 12 via a metering device 13 , eg a metering valve, as a fluid urea-water solution. The aqueous urea solution is stored in the reducing agent tank 14 . A suction line 15 is provided for removing the urea solution. The removal of the solution is done by means of a delivery pump 16 , so that the fluid solution under pressure in the pressure line 17 is introduced into the metering device 13 and sprayed ...

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PUM

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Abstract

The invention provides a method for measuring the temperature of a medium, wherein the medium is in contact with at least one heating device. The heating device comprises at least one PTC element. At least one parameter of the characteristics of the current and / or the voltage and / or the resistance of the PTC element during the operation of the heating device is detected. From these detected values is at least formed a conductance. From the time-dependent conductance is formed at least one predictor, which is evaluated to draw conclusions about the temperature of the medium.

Description

technical field [0001] The invention relates to a method and a temperature sensor for measuring the temperature of a medium. Background technique [0002] A method and a device are known, in particular for the operation of an internal combustion engine in a motor vehicle in which an SCR catalytic converter ( S elective C analytic R eduction—selective catalytic reduction). In the presence of a reducing agent, the catalytic converter reduces nitrogen oxides (NOx) contained in the exhaust gas of the internal combustion engine to nitrogen. This measure can significantly reduce the nitrogen oxide content in the exhaust gas. Ammonia (NH 3 ), mixing ammonia into the exhaust. Repeatedly will decompose NH 3 Reagents are used as reactants or reducers. Usually an aqueous urea solution is used in this connection. An aqueous urea solution is injected into the exhaust gas line upstream of the SCR catalytic converter by means of a metering device. [0003] In order to store the u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00G01K7/22
CPCF01N3/2066G01K7/42F01N2610/02F01N2610/148Y02T10/24F01N2610/1406G01K7/16F01N2610/10F01N11/00F01N2900/1811G01K2205/00G01K2217/00Y02A50/20Y02T10/12Y02T10/40
Inventor W.克伦克M.蔡诺伊克斯D.胡米尼克
Owner ROBERT BOSCH GMBH
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