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Method and apparatus used for diagnosing the dynamic performance of a waste gas sensor.

A technology of exhaust gas sensor and diagnostic device, which is applied to the diagnostic device of exhaust gas treatment device, exhaust device, electric control of exhaust gas treatment device, etc. The effect of good on-board diagnostics

Active Publication Date: 2011-06-22
ROBERT BOSCH GMBH
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  • Application Information

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Problems solved by technology

However, through a large number of experiments, it is found that the slowdown of the detector under different regulator designs, system states and operating points will lead to a cycle duration extension with a large deviation from the actual cycle duration extension

Method used

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  • Method and apparatus used for diagnosing the dynamic performance of a waste gas sensor.
  • Method and apparatus used for diagnosing the dynamic performance of a waste gas sensor.
  • Method and apparatus used for diagnosing the dynamic performance of a waste gas sensor.

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Embodiment Construction

[0031]In the two-point control algorithm, the lambda in the exhaust gas swivels between two predefined limit values. If lambda reaches the lower limit value assigned to the rich air-fuel mixture, the two-point control algorithm adjusts the fuel metering device of the internal combustion engine and the controller setting value of the throttle device in such a way that the air-fuel ratio is changed to a lean adjustment , That is, excessive air is carried out. If lambda thus reaches the upper limit value assigned to the lean air-fuel mixture, the two-point control algorithm adjusts the fuel measuring device and the regulator setting value of the throttle device in such a way that the air-fuel ratio changes to a richer Adjustment, ie excess fuel, takes place. The speed of changeover between lean and rich control then depends on the selected control variable, the control range and the dynamics of the exhaust gas sensor. However, with a given control parameter and a given control ...

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Abstract

The invention relates to a method and an apparatus used for diagnosing the dynamic performance of a waste gas sensor. The invention relates to a method for diagnosing the dynamic performance of a waste gas sensor used as a construction of a two-point type [lambda] detector. The waste gas sensor is disposed in a waste gas channel and is used for adjusting the air fuel ratio of the gas mixture transmitted into the internal combustion engine by a [lambda] regulator; the period duration time of the [lambda] regulator is calculated for diagnosing the dynamic performance of the waste gas sensor. according to the invention, a [lambda] regulator output signal composed of jump portions and slope portions is predefined as a regulating value in [lambda] regulation; and in the diagnosis period, the [lambda] calculation regulation is dependent on the regulator stationary time caused by regulator design and the period duration prolongation determined and corrected there-from. The invention also relates to an apparatus used for implementing the method.

Description

technical field [0001] The invention relates to a method for diagnosing the dynamics of an exhaust gas sensor designed as a two-point lambda probe, which is arranged in the exhaust gas duct of an internal combustion engine and with which the supply to the internal combustion engine is regulated via a lambda regulator The air-fuel ratio of the gas mixture for which the cycle duration of the lambda controller is evaluated for diagnosing the dynamics of the exhaust gas sensor. [0002] The invention also relates to a device for carrying out the method according to the invention. Background technique [0003] Lambda regulation combined with a catalytic converter is currently the most effective exhaust gas purification method for fast combustion engines. Very low exhaust gas values ​​can only be achieved in conjunction with the currently available ignition and injection systems. [0004] It is particularly effective to use a three-way catalytic converter or a selective catalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00
CPCF02D2041/1431F02D41/1495F02D41/1454Y02T10/40F02D41/1474F01N2560/025F02D41/222
Inventor K·韦迈尔M·普费尔褚思芸A·克莱门特
Owner ROBERT BOSCH GMBH
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