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Method and device for controlling and/or monitoring the function of a secondary air supply in an emission control system

A technology for secondary air and exhaust gas purification, applied in electrical control, exhaust device, engine control and other directions, can solve the problems of low precision and poor suitability of guidance adjustment, and achieve the effect of low cost

Inactive Publication Date: 2018-01-05
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the second broadband lambda probe has functional disadvantages in this arrangement compared to the two-point lambda probe in this installation position
These disadvantages are, on the one hand, the lower precision of the guide adjustment in the range around λ=1 and, on the other hand, the poor detection of lambda breakthrough for the diagnosis of the first catalytic converter. suitability

Method used

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  • Method and device for controlling and/or monitoring the function of a secondary air supply in an emission control system

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Embodiment Construction

[0040] figure 1 An internal combustion engine 1 is shown schematically, comprising a motor block 10 and an exhaust duct 20 in which, in the direction of flow of the exhaust gas, an arrangement as a broadband lambda probe is arranged The lambda probe 30 and the first catalytic converter 40 are arranged behind it. Lambda probe 30 is capable of lambda regulation 100 and is used for a diagnostic first balancing 110 of the storage capacity of the first catalytic converter. The lambda probes are generally designed as broadband lambda probes.

[0041] According to the invention, a first two-point lambda probe 50 is arranged downstream of the first catalytic converter 40 , which is used for catalytic converter diagnosis-guided adjustment and for the Diagnostic breakthrough detection of a catalytic converter 40 . This first two-point lambda probe 50 is additionally used to equalize the storage capacity of the next further catalytic converter 60 . Further catalytic converter 60 can ...

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Abstract

In a method and device for controlling and / or monitoring the function of a secondary air supply in an emission control system of an internal combustion engine, the emission control system includes atleast two catalytic converters situated in succession in an exhaust duct, it being possible for the second catalytic converter to be implemented as a combination of catalytic converter and particulatefilter. For a secondary air diagnosis and for secondary air control, a two-point lambda probe is situated, with respect to a direction of flow of exhaust gas, downstream of the first catalytic converter. Measures are applied for compensating tolerance and aging effects of the two-point lambda probe. This results in particular in cost advantages in emission control systems for fulfilling stricteremission requirements. In particular, this makes it possible to operate the particulate filter in optimized fashion.

Description

technical field [0001] The invention relates to a method for controlling and / or monitoring the function of a secondary air supply in an exhaust gas purification system of an internal combustion engine which has in its central section at least two exhaust gas Catalytic converters arranged one behind the other in the tract, and further exhaust gas purification components can be arranged before and / or after this central section, wherein in the flow direction of the exhaust gas after the motor block and after the first catalytic converter A lambda probe is arranged before the further catalytic converter, and a further exhaust gas probe is arranged upstream of the further catalytic converter, wherein between the first catalytic converter and the further catalytic converter by means of the secondary air supply means Air is introduced for optimal operation of the further catalytic converter. [0002] Furthermore, the invention relates to a device, in particular a motor control unit,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N9/00F02D41/14
CPCF01N3/035F01N3/22F01N3/30F01N9/00F01N11/00F01N11/007F01N13/009F01N2550/14F01N2560/025F01N2560/14F01N2900/08F01N2900/1402F01N2900/1602F01N2900/1804Y02T10/40F01N3/021F01N2560/12
Inventor F.迈尔M.布莱M.法伊M.普法伊尔
Owner ROBERT BOSCH GMBH