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Method for monitoring a subsystem installed in a motor vehicle

一种机动车辆、子系统的技术，应用在监测安装在机动车辆中的子系统领域，能够解决消除系统错误、子系统干扰等问题，达到提高可靠性、可靠采集和评估的效果

Active Publication Date: 2014-02-19
MERCEDES BENZ GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This also applies to cases where an impermissible disturbance of the monitored subsystem occurs, e.g. a temporary interruption of the system's error display function, despite the apparent or actual elimination of system errors Disabling, especially does not eliminate the cause of system errors in a programmed manner

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] According to Table 1, advantageous embodiments are explained below in conjunction with the status information listed in Table 1 and stored in the error memory of the diagnostic unit. Without limiting the generality, the starting point is that the diagnostic unit of the SCR exhaust gas aftertreatment system of the internal combustion engine of the motor vehicle has checked especially for system errors, and the result of the check is that the urea solution for the reduction of nitrogen oxides is significantly low consume. The cause of such a system error can be, for example, an interruption of the energy supply to the dosing module or the dosing unit for dispensing the urea solution.

[0026] Table 1

[0027] Number of driving cycles F

…

n

n+1

n+2

n+3

n+4

…

n+m

n+m+1

…

error bit B

…

0

0

1

1

1

…

1

1

…

mode bit M

…

0

0

1

1

1

…

1

1

…...

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PUM

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Abstract

The invention relates to a method for monitoring a subsystem installed in a motor vehicle, in which a diagnostic unit checks the subsystem for system faults at least during driving cycles of the motor vehicle, wherein the check is carried out both for occurrence and for rectification of a system fault. The invention provides for the diagnostic unit to carry out a misuse estimation on the basis of a frequency with which the occurrence and / or the rectification of the system fault has / have been detected in order to determine whether the detected occurrence and / or the detected rectification of the system fault is / are based on misuse. If occurrence of the system fault is detected, a restriction operating mode is activated or an activated restriction operating mode is continued, in which mode drivability of the vehicle is restricted after a predefinable number of driving cycles have passed or after a predefinable travel distance has passed without the rectification of the system fault being detected.

Description

technical field [0001] The invention relates to a method for monitoring subsystems installed in a motor vehicle according to the preamble of claim 1 . Background technique [0002] Subsystems installed in motor vehicles, such as coolant systems, lubricant systems, passenger seat belt retractor systems, or other safety systems, are typically monitored for proper function or system errors. System errors are typically displayed to the driver of the motor vehicle and the driver is asked to correct the error. [0003] Thus, for example, DE 195 48 684 A1 describes a method in which an exhaust-related error function occurring in a motor vehicle with an internal combustion engine is detected via an on-board sensor system and the error is recorded, And it is evaluated in the circuit unit and displayed by indicator lights if necessary. [0004] For legal or liability reasons, it is necessary to ensure that system errors are eliminated when some errors occur. This also applies to ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/05
CPCG01M15/05G01M15/10F01N3/2066F01N11/00F01N2550/02F01N2550/03F01N2900/0421F01N2900/10F01N2900/102F01N2900/12F02D41/0235F02D41/22F02D2400/11Y02A50/20Y02T10/12Y02T10/40
Inventor H·沙库拉M·里希特
Owner MERCEDES BENZ GRP
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