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Method and device for identifying errors in emission-relevant control devices of a vehicle

A control device and error technology, applied in electrical control, engine control, fuel injection control, etc., can solve the problem of less serious emission deterioration

Inactive Publication Date: 2015-02-25
CONTINENTAL AUTOMOTIVE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the problem is less severe in terms of emissions deterioration, no emissions-related error is identified or communicated to the driver
The overall system may exceed the emissions limit if there are other less serious errors in later states, for example at one or more additional cylinders, but none of the individual methods identify emissions-related errors
In other words, therefore, in the case in which none of the individual cylinders exceeds the emission limit value, but all cylinders together exceed the emission limit value, this is not recognized as an error

Method used

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  • Method and device for identifying errors in emission-relevant control devices of a vehicle
  • Method and device for identifying errors in emission-relevant control devices of a vehicle
  • Method and device for identifying errors in emission-relevant control devices of a vehicle

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Experimental program
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Embodiment Construction

[0021] exist figure 1 , firstly shows a diagram in which the error function Y(X) is indicated as a function of the deviation of the injected fuel quantity MF (fuel mass) from the target value.

[0022] According to the method according to the invention, for example in the cylinder, the injected fuel quantity MF is regarded as a parameter concerning the occurrence of an emission increase. In this case, for example, individual errors can occur in the cylinders, which can lead to faulty operating behavior and thus also to increased emissions. Thus, for example, the nozzles of cylinders age over time. In this case, the friction of the needle, as well as the size of the nozzle, change over time. Furthermore, a type of nozzle coking and thus a narrowing of the nozzle can occur. In addition, damage occurs in the operating elements of the nozzles, for example piezo elements.

[0023] Here, if the occurrence of an error related to the unit of a plurality of cylinders is observed, f...

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Abstract

A method and a device for identifying errors in emission-relevant control devices of a vehicle, such as the injection of fuel into a cylinder, allows error identification even if none of the sub-systems exceeds a predetermined threshold value. The method has the following steps: determining whether at least one parameter, which permits conclusions to be drawn about the emission behaviour of the respective control device, lies in a desired range; if the parameter lies outside said desired range, an error value that correlates to an increase in emissions is stored; if the parameter is in the desired range, an error value of zero is stored; a total error value is formed from all error values of the control device and an error message is output if the total error value exceeds a predetermined threshold value.

Description

technical field [0001] The invention relates to a method and a device for detecting errors in an emission-related control device in a vehicle, for example injecting fuel into a cylinder. Background technique [0002] For legal reasons, different methods for detecting errors are implemented in emission-related control devices in motor vehicles. On the one hand, methods are directly required by the legislator, in which methods, when certain emission limits (Emissionsgrenze) are exceeded, errors must most of the time be identified and communicated via function failure indicators (Fehlfunktionsanzeige) (malfunction indicator lamps) (Fehler ) to the driver. At the data communication interface for the workshop, a code, for example a DTC code (Diagnostic Trouble Code), is provided for each detected error in order to facilitate error finding. [0003] In conventional systems, as known from the prior art, the error detection of each individual method is independent of the error det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/22
CPCF02D2200/0614Y02T10/40F02D2041/228F02D41/221F02D2041/224F02D41/22
Inventor C-E·霍夫梅斯特M·卡斯鲍尔
Owner CONTINENTAL AUTOMOTIVE GMBH