Method and device for fault diagnosis in control systems in an internal combustion engine in a motor vehicle
First Claim
1. A method for fault diagnosis in control systems in an internal combustion engine in a motor vehicle, which monitors the operational capacity of sensors, actuators and/or system functions and on identification of a fault symptom determines the actual cause of the fault, comprising the steps of:
- intervening in the functions of the control systems by a diagnosis manager such that only the smallest possible restriction results for operation of the motor vehicle, wherein an intervention causing a smallest possible restriction is selected from the group of restriction measures consisting of;
“
using a shut-off function,”
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limiting the control range of a control function in particular in the upper range,” and
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blocking an individual function,”
collecting all the information by the diagnosis manager relating to at least one fault symptom, which is a possible cause of a fault,determining the actual cause of one or a plurality of faults with reference to a fault profile of the symptoms, andstoring said actual cause.
1 Assignment
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Accused Products
Abstract
In control systems (5) for internal combustion engines (14) in motor vehicles it is known that fault diagnoses are carried out to ensure the functional reliability of the internal combustion engine (14) or the motor vehicle even in the event of a fault. If a fault symptom (1) occurs, the cause of the fault is determined and a diagnosis manager (3) is used as a rule to deactivate the defective control system (5) completely or to initiate an emergency operation function. It is proposed that all information relating to fault symptoms should be listed, the actual cause should be determined by comparison with stored fault profiles and as a result only the smallest possible restriction of the functions of the relevant control systems (5) should be initiated. This has the advantage that the control system (5) can as a rule continue to be operated despite their restricted functional scope.
15 Citations
19 Claims
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1. A method for fault diagnosis in control systems in an internal combustion engine in a motor vehicle, which monitors the operational capacity of sensors, actuators and/or system functions and on identification of a fault symptom determines the actual cause of the fault, comprising the steps of:
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intervening in the functions of the control systems by a diagnosis manager such that only the smallest possible restriction results for operation of the motor vehicle, wherein an intervention causing a smallest possible restriction is selected from the group of restriction measures consisting of;
“
using a shut-off function,”
“
limiting the control range of a control function in particular in the upper range,” and
“
blocking an individual function,”collecting all the information by the diagnosis manager relating to at least one fault symptom, which is a possible cause of a fault, determining the actual cause of one or a plurality of faults with reference to a fault profile of the symptoms, and storing said actual cause. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for fault diagnosis in a control system in an internal combustion engine in a motor vehicle, comprising a diagnosis device to determine fault symptoms in sensors, actuators and system functions, a programmable diagnosis manager to analyze the fault symptoms and to limit the functions of the control systems, wherein the diagnosis manager is configured and operable to list information about fault symptoms, compare listed information about fault symptoms with stored fault profiles, derive one or a plurality of fault causes from the comparison, and initiate an appropriate minimal intervention taking into account the seriousness of the occurring fault to limit the functionality of the relevant control system, wherein the appropriate minimal intervention is selected from the group of restriction measures consisting of “
- using a shut-off function,”
“
limiting the control range of a control function in particular in the upper range,” and
“
blocking an individual function”
. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
- using a shut-off function,”
Specification
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- Resources
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Current AssigneeSiemens AG
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Original AssigneeSiemens AG
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InventorsHofmeister, Carl-Eike, Käsbauer, Michael, Prenninger, Martin
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Primary Examiner(s)Nghiem, Michael
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Assistant Examiner(s)Khuu, Cindy D.
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Application NumberUS10/967,437Publication NumberTime in Patent Office743 DaysField of Search702/183US Class Current702/183CPC Class CodesF02D 41/22 Safety or indicating device...F02D 41/266 the computer being backed-u...
