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Control device and method for diesel engine SCR system

A technology of SCR system and diesel engine, which is applied to engine components, combustion engines, machines/engines, etc., can solve the problems of increasing energy consumption, achieve the effects of saving energy consumption, suppressing nozzle crystallization, and improving work stability

Inactive Publication Date: 2019-09-20
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In addition, to maintain high pressure, the hydraulic pump is always running, which unnecessarily increases energy consumption

Method used

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  • Control device and method for diesel engine SCR system
  • Control device and method for diesel engine SCR system
  • Control device and method for diesel engine SCR system

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Experimental program
Comparison scheme
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Embodiment Construction

[0017] In the various figures of the present application, structurally identical or functionally similar features are denoted by the same reference numerals.

[0018] figure 1 A simplified schematic diagram of a diesel engine SCR system is shown schematically, in which a control device 100 according to the present application is employed. Specifically, the SCR system mainly includes a urea aqueous solution storage 200 , an injection unit 300 for selectively injecting the urea aqueous solution into the exhaust pipe 500 of the diesel engine, and a urea aqueous solution for pressurized supply of the urea aqueous solution from the storage 200 to the injection unit 300 Pump 400. Besides, the SCR system also includes an SCR catalyst (not shown in the figure) arranged in the exhaust pipe 500 . Communication between the reservoir 200 and the pump 400 and between the spray unit 300 and the pump 400 is via fluid lines. The injection unit 300 includes a nozzle that protrudes at least ...

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Abstract

The invention discloses a control device and method for a diesel engine SCR system and the diesel engine SCR system using the same. The SCR system comprises a pump (400) used for pressurizing a urea aqueous solution and supplying the urea aqueous solution to a spraying unit (300), a control device (100) is in data connection with the pump (400), wherein the control device (100) selectively enables the pump (400) to enter an " idle " mode, and in the " idle " mode, the pump (400) is enabled to be operated in a mode that the pressure in a fluid pipeline between the pump (400) and the spraying unit (300) is lower than the pressure required by spraying the urea aqueous solution from the spraying unit (300).

Description

technical field [0001] The present application generally relates to control devices and methods for diesel engine SCR systems. Background technique [0002] For environmental reasons, a Selective Catalytic Reduction (SCR) system is currently widely used in diesel vehicles to treat engine exhaust gas. The SCR system includes a urea aqueous solution injection unit. According to the needs, the urea aqueous solution is injected into the engine exhaust pipe through the nozzle of the urea aqueous solution injection unit, so as to react with the nitrogen oxides in the engine exhaust gas through the SCR catalyst of the SCR system and do no harm to it. Toxic treatment and discharge to the outside world. [0003] Typically, some time after the engine is started, the hydraulic pump of the SCR system is activated, building up high pressure in the internal fluid lines of the SCR system. In this way, even when the nozzle of the urea aqueous solution injection unit is closed, the interna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20
CPCF01N3/208F01N2610/02F01N2610/1433F01N2610/1453F01N2560/06Y02T10/12
Inventor 董驷维周洪龙赵应兵
Owner ROBERT BOSCH GMBH