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Storage boxes and their functional units

A functional unit and storage box technology, applied in engine components, exhaust treatment, mechanical equipment, etc., can solve problems such as component damage, and achieve the effects of reliable operation, simple construction, and reduction of harmful substance emissions

Inactive Publication Date: 2016-06-29
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, higher pressures, so-called ice pressures, are generated, which can easily lead to damage to components of the functional unit which are subjected to ice pressure

Method used

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  • Storage boxes and their functional units
  • Storage boxes and their functional units

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Experimental program
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Embodiment Construction

[0020] in figure 1 The internal combustion engine 1 is shown very simply and schematically in, and the internal combustion engine 1 has an exhaust gas aftertreatment device 3. The exhaust gas aftertreatment device 3 includes an exhaust pipe 5, an oxidation catalyst 7 and an SCR catalyst 11 for selectively catalytically reducing nitrogen oxides harmful to health. The particulate filter which is usually arranged downstream of the oxidation catalyst 7 is not shown in the figure. The flow direction of the exhaust gas through the exhaust pipe 5 is indicated by an arrow (no reference numeral).

[0021] In order to supply the SCR catalyst 11 with a liquid reducing agent, such as an aqueous urea solution (so-called AdBlue) or other liquid reducing agent, a feeding device 13 for the aqueous urea solution is arranged on the exhaust pipe 5 upstream of the SCR catalyst 11. The feeding device 13 injects the urea aqueous solution into the exhaust pipe 5 upstream of the SCR catalyst 11 when ne...

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Abstract

The invention relates to a functional unit (20) of a supply tank (19) of an injection device (15) for a liquid reducing agent in an exhaust gas post-treatment device (3) comprising a catalyst (11) for selective catalytic reduction (SCR). The functional unit (20) is essentially equipped to convey the reducing agent from the supply tank (19) in a targeted manner and to prevent the reducing agent from freezing at least in the region of the functional unit (20) at extremely low temperatures. The functional unit (20) is designed such that it is not damaged when the reducing agent freezes.

Description

Technical field [0001] The invention relates to a storage box of spray equipment and its functional unit. Background technique [0002] Due to increasingly stringent exhaust gas control regulations, especially in the case of automobiles with internal combustion engines, the carbon oxide content in the exhaust gas must be further reduced. A common method is the selective catalytic reduction (SCR) method using a catalyst, in which the harmful nitrogen oxides in the exhaust gas are reduced to nitrogen and water by means of a liquid reducing agent, such as an aqueous urea solution (so-called AdBlue). In this method, a pump is usually used to transport the reducing agent from the storage tank to the inlet valve, and then the reducing agent is injected into the exhaust gas. [0003] The prior art and the present invention are distinguished by "upper" and "lower" hereinafter. Here, unless otherwise indicated, these instructions refer to the installation state of the storage box. [0004]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20
CPCF01N3/2066F01N2610/02F01N2610/10F01N2610/1406F01N2610/1433F01N2610/1466Y02A50/20Y02T10/12
Inventor R·黑贝尔G·洛拉斯
Owner ROBERT BOSCH GMBH