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Method for operating an internal combustion engine and device for implementing the method

A technology of internal combustion engine and equipment, applied in the field of equipment implementing the method, to achieve high precision, avoid reagent leakage, and avoid low dose effects

Inactive Publication Date: 2011-08-10
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Consider the fact that either reagent leakage or insufficient NOx reduction reaction will cause a deviation in the same direction between the calculated data for the indicated NOx concentration and the measured data for the sum of the indicated NOx concentration and the reagent concentration

Method used

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  • Method for operating an internal combustion engine and device for implementing the method
  • Method for operating an internal combustion engine and device for implementing the method

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Embodiment Construction

[0023] The figure shows an internal combustion engine 10 . An air detection device 12 is arranged in the intake region 11 of the internal combustion engine 10 and a reagent metering device 14 , a first NOx sensor 15 , an SCR catalytic converter 16 , an associated SCR catalytic converter 16 are arranged in the exhaust gas region 13 of the internal combustion engine 10 . A temperature sensor 17 and a second NOx sensor 18 .

[0024] Downstream of internal combustion engine 10 , exhaust gas flow ms_abg and NOx untreated concentration (NOx-Rohkonzentration) NOx_vK occur. The NOx concentration NOx_nK and the reagent leakage ms_Rea_nK occur downstream of the SCR catalytic converter 16 .

[0025] The air detection device 12 provides the air signal ms_L to the controller 20, the internal combustion engine 10 provides the rotation signal n, the first NOx sensor 15 provides the first NOx signal NOx_vK_mess, the temperature sensor 17 provides data indicating the temperature te_Kat of the...

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Abstract

The invention relates to a method for operating an internal combustion engine (10), in the exhaust gas section (13) of which is arranged at least one SCR catalytic converter (16), which is hit with a reagent that contributes to NOx conversion in the SCR catalytic converter (16), and to a device for implementing the method. At least one measure (NOx_nK_mod) is calculated for the NOx concentration (NOx_nK) downstream after the SCR catalytic converter (16). An NOx sensor (18), which is arranged downstream after the SCR catalytic converter (16), generates an exhaust gas sensor signal (S_nK) whichcorresponds to at least the NOx concentration (NOx_nK) and optionally, as a result of cross sensitivity, to a reagent slip (ms_Rea_nK).; A reagent signal (S_Rea), which determines the dosage of reagent, is influenced by a correction signal (d_ReaSP) as a function of the difference (D) and as a function of a measure for the temperature (te_Kat) of the SCR catalytic converter (16).

Description

technical field [0001] The invention relates to a method for operating an internal combustion engine. An SCR catalytic converter is arranged in the exhaust gas region of the internal combustion engine and a NOx sensor is arranged downstream of the SCR catalytic converter, and the invention also relates to a device of the type described for carrying out the method. Background technique [0002] A method and a device for operating an internal combustion engine are described in DE 19903439 A1. An SCR (Selective-Catalytic-Reduction (Selective Catalytic Reduction)) catalyst is installed in the exhaust gas region of the internal combustion engine. The catalytic converter reduces nitrogen oxides contained in the exhaust gas of an internal combustion engine to nitrogen with a reagent. The dosage of the agent is preferably determined as a function of the operating characteristics of the internal combustion engine, such as the rotational speed and the injected fuel quantity. Furthe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/94B01D53/90F01N3/20F01N11/00
CPCB01D53/9495F01N2610/146F01N2560/14F01N9/005F01N2900/0408Y02T10/47F01N2900/1814F01N2390/02F01N9/00B01D53/90F01N2900/14F01N2560/06Y02T10/24B01D53/9409F01N2560/026F01N2560/07F01N3/208F01N2900/1622Y02T10/12Y02T10/40
Inventor C·沃茨M·洛尔A·鲁多尔夫
Owner ROBERT BOSCH GMBH
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