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Device for metering a urea soulution

a technology of urea solution and metering device, which is applied in the direction of machines/engines, separation processes, instruments, etc., can solve the problem of relatively unproblematic measurement of state variables, and achieve the effect of accurate and selective determination of urea concentration

Inactive Publication Date: 2005-01-20
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a device for measuring urea solution using a sensor unit that includes a measuring sensor. The sensor unit includes a measuring sensor that can monitor the physical state of the urea solution without the need for enzymatic breakdown. The sensor can detect electric state variables, such as pH, conductance, and dielectric constant, by applying an electric d.c. or a.c. voltage to electrodes. The sensor can also detect viscosity or density, which are physicomechanical state variables that affect the behavior of the solution when agitated. The sensor can be designed with a large surface area and small distance between the electrodes to reduce the test voltage and current. The sensor can be used in combination with a temperature sensor to correct errors due to temperature variations. The device can also include a filling level sensor for measuring the degree of filling of a storage container for the urea solution.

Problems solved by technology

Measurement of these state variables is comparatively unproblematical and in particular it is possible to perform these measurements in situations of extreme temperature variations.

Method used

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  • Device for metering a urea soulution
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Examples

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Embodiment Construction

[0022] Sensor unit 1 is mounted on a sensor plate 2. A comb-shaped electrode 3 is divided into two areas 4, 5. Individual teeth of the comb structure are spaced farther apart in upper area 5 than in lower area 4. In upper area 5, another electrode 6 engages with a corresponding comb structure. The two electrodes 5 and 6 extend over a large area of sensor plate 2 and constitute a filling level sensor. A third electrode 7 is situated opposite lower area 4 of electrode 3. The comb structure of electrode 7 corresponds to the finer comb structure of lower area 4 of electrode 3, i.e., the teeth are not as far apart.

[0023] Together with lower area 4 of electrode 3, electrode 7 forms a measuring sensor according to an exemplary embodiment of the present invention for measuring an electric state variable, e.g., the conductivity, the dielectric constant, etc.

[0024] Electric terminals 8 for electrodes 3, 6, 7 are provided in the lower area of sensor plate 2. These electric terminals 8 may be...

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Abstract

A device for metering urea solutions permitting a reliable reduction of nitrogen oxides in the exhaust gas of an internal combustion engine is provided. This is achieved by the fact that the device for metering the urea solution includes a sensor unit for monitoring one or more physical state variables of an enzyme-free Urea solution.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a device for metering a urea solution. BACKGROUND INFORMATION [0002] To reduce nitrogen oxides in the exhaust gas of motor vehicles, urea solution has in the past been sprayed into the exhaust gas during catalytic reduction. Urea is broken down into carbon dioxide and ammonia by chemical reaction on a hydrolysis catalyst. Ammonia then reacts selectively with nitrogen oxides to form nitrogen and water, thus removing nitrogen oxides from the exhaust gas. [0003] For reliable reduction of nitrogen oxides with a urea solution, various parameters are important, in particular the urea concentration in the aqueous solution. [0004] Sensor applications known in the past for measuring the urea concentration in the fields of medicine and biology have used urease, which enzymatically and selectively breaks down urea to form ammonia. Sensors then detect the influence of the ammonia on the pH of the solution. Information regarding the ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01N11/16B01D53/90B01D53/94F01N3/08F01N3/20G01N5/02G01N27/06G01N27/10G01N27/22G01N27/416
CPCB01D53/90B01D53/9495F01N3/2066F01N11/00F01N2610/02Y02T10/24F01N2900/1814F01N2900/1818G01N33/0009Y02T10/47F01N2900/1811Y02T10/12Y02T10/40
Inventor RIPPER, WOLFGANGBERGER, JOACHIMMAHR, BERNDBRINZ, THOMAS
Owner ROBERT BOSCH GMBH
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