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Detection of leakage in an air system of a motor vehicle

一种汽车、废气的技术，应用在装料系统、空气质量改善、排气处理装置的电控等方向，能够解决废气质量流足够的散热低、颗粒过滤器损坏等问题，达到减少氧气、改善使用寿命、防止损坏的效果

Inactive Publication Date: 2010-09-22
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At low engine speeds, the exhaust gas mass flow is too low for sufficient heat dissipation, which can lead to heat-induced damage in the particulate filter

Method used

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  • Detection of leakage in an air system of a motor vehicle
  • Detection of leakage in an air system of a motor vehicle
  • Detection of leakage in an air system of a motor vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] figure 1 A schematic diagram shows an internal combustion engine 10 in the form of a diesel engine with a cylinder block 12 , a fuel metering system 11 , an intake duct 20 conducting an intake air flow 21 , and an exhaust duct 30 conducting an exhaust gas flow 32 of the internal combustion engine 10 . A throttle valve 24 is arranged in the intake passage 20 . The exhaust gas recirculation channel 25 connects the intake channel 20 with the exhaust gas channel 30 at least briefly via an exhaust gas recirculation valve 26 . Behind the cylinder block 12 in the flow direction of the exhaust gas flow 32 , a first oxygen sensor 43 , a fuel supply channel 45 (optional), a diesel oxidation catalytic converter are shown as components of an exhaust gas aftertreatment system 40 associated with the internal combustion engine 10 . form of an oxidation catalyst 41 , a second oxygen sensor 44 and a diesel particulate filter 42 . The exhaust system of a diesel engine can also be equip...

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PUM

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Abstract

A method is described for operating an internal combustion engine in motor vehicles, in which air is supplied to a combustion chamber via a throttle valve and an air supply channel, and in which exhaust gas is conducted through a particulate filter and is returned at least intermittently and at least partially through an exhaust gas recirculation valve into the air supply channel, and in which an oxygen proportion in the exhaust gas is detected using at least one lambda probe. In this context, in an overrun operation, the throttle valve is controlled to close and the exhaust gas recirculation valve is controlled to open, a variable characterizing the oxygen concentration in the exhaust gas is compared to a boundary value, and as a function of the result of the comparison, it is concluded that there is a leakage in the air supply channel.

Description

technical field [0001] The invention relates to a method according to the preamble of claim 1 as well as to a computer program, an electrical storage medium and a control and / or regulation device for a system for aftertreatment of exhaust gases in a motor vehicle. Background technique [0002] Internal combustion engines are known from the market which are equipped with a particle filter and in which the combustion of soot is controlled so as to protect the particle filter. Such a device, together with a corresponding method, is described in DE 10 2007 010 189 A1 for regulating the temperature of the exhaust gas during the regeneration of a particle filter. [0003] During the regeneration operation of the particle filter, for example, a high oxygen supply can lead to locally increased soot combustion in the particle filter during the overrun phase of the internal combustion engine. At low engine speeds, the exhaust gas mass flow is too low for sufficient heat dissipation, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N9/00F01N11/00F02D41/22F01N3/023
CPCF02D2041/0022F01N2560/025F02D41/0077F01N13/02Y02T10/47F02D41/0002F02D11/107F02M25/0702F02D41/1454F02D41/221F01N11/007F01N3/103F01N2430/085F02D2041/0017F01N9/002F01N13/009F02M26/49Y02A50/20Y02T10/40
Inventor S·德特里考德D·耶格
Owner ROBERT BOSCH GMBH
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