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Method for monitoring a metering device

A technology of metering device and metering valve, which is applied in the direction of electric control of exhaust treatment device, test/calibration of volume measurement, diagnostic device of exhaust treatment device, etc., can solve problems such as impracticability and achieve low cost effect

Active Publication Date: 2015-09-23
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for monitoring a metering device
  • Method for monitoring a metering device
  • Method for monitoring a metering device

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Embodiment Construction

[0018] figure 1 The metering device in the SCR catalytic converter system is shown in a schematic manner. The SCR catalytic converter 12 is arranged in the exhaust system 10 of the internal combustion engine 11 , and the SCR catalytic converter selectively reduces nitrogen oxides in the exhaust gas by selective catalytic reduction (SCR). Use ammonia (NH 3 ) as the reducing agent for this reaction. Because ammonia is a toxic substance, this substance is obtained from the non-toxic carrier urea. Urea is injected as an aqueous urea solution as a liquid into the exhaust system 10 via a metering device 13 , for example via a metering valve upstream of the SCR catalytic converter 12 . The aqueous urea solution is stored in the reducing agent tank 14 . A suction pipe 15 is provided for taking out the aqueous urea solution. The reducing agent is discharged from the reducing agent tank 14 via the delivery pump 16 and is guided under pressure in the pressure line 17 to the metering...

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Abstract

The method involves hydraulically coupling dosed quantity and load at a conveying pump, and monitoring accuracy of a dosing device based on relation between parameters of a pumping stream stroke and a controller (21) of a dosing valve. Correlation of opening-and / or closing processes and control periods of the dosing valve is determined. Pump stream (23) is adapted to modified hydraulic position via a rotary speed controller of the pump, during opening of the dosing valve. Pump rotary speed (22) is regulated via a proportional-integral (PI)-controller. Independent claims are also included for the following: (1) a computer program executing steps of a method for monitoring a dosing device (2) a computer program product executing the method for monitoring the dosing device.

Description

technical field [0001] The invention relates to a method for monitoring a metering device for a liquid medium, the metering device comprising a delivery pump and at least one metering valve, wherein the delivery pump can be adjusted to a predeterminable medium pressure. Background technique [0002] Methods and devices are known for operating an internal combustion engine, in particular in a motor vehicle, in the exhaust region of which an SCR (Selective Catalytic Reduction) catalytic converter is arranged, which converts the exhaust gas of the internal combustion engine containing nitrogen oxides ( NOx) exhaust gas is reduced to nitrogen with a reducing agent. As a result, the nitrogen oxide content in the exhaust gas can be significantly reduced. Ammonia (NH 3 ), the ammonia mixes with the exhaust gas. Therefore use NH 3 Or can separate NH 3 reagents as reactants or reducers. For this purpose, an aqueous urea solution is usually used, which is injected into the exhau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00
CPCG01F25/0092F01N2550/05F01N3/208F01N2900/0418F01N2900/1822Y02T10/47Y02T10/24F01N11/00Y02A50/20Y02T10/12Y02T10/40
Inventor B.巴辛H.温特
Owner ROBERT BOSCH GMBH