Device and method for on-board diagnosis based on a model

• US 20060271256A1
• Filed: 01/14/2004
• Published: 11/30/2006
• Est. Priority Date: 02/21/2003
• Status: Active Grant

• Current Assignee: Audi AG (Volkswagen AG), Volkswagen AG
• Original Assignee: Audi AG (Volkswagen AG), Volkswagen AG
• Inventors: Henecker, Frank, Breuer, Andreas, Siebel, Ulrich
• Granted Patent: US 7,295,903 B2
• Time in Patent Office: Days
• US Class Current: 701/35
• CPC Class Codes: G05B 23/0251 Abstraction hierarchy, e.g. "complex systems", i.e. system is divided in subsystems, subsystems are monitored and results are combined to decide on status of whole system
• CPC Class Codes: G05B 23/0278 Qualitative, e.g. if-then rules; Fuzzy logic; Lookup tables; Symptomatic search; FMEA

Abstract

The aim of the invention is to improve the diagnosis of motor vehicle systems comprising a plurality of functional components in a network. To this end, the individual status data of the control units (11, 12, 13, 14) is monitored in a central diagnostic control unit (15) using a mathematical model. Each control unit can also be provided with a self-diagnosis optionally based on a model. By calculating error or causes of error using a model, the control units do not need to be provided with large databases for the diagnosis of error.

Claims

1. Device for on-board diagnosis of a vehicle system, comprising a plurality of functional components which components are networked to one another, of which at least two are control devices, and

a computing means which can be connected to a plurality of functional components by way of a connecting means, for recording and evaluation of component data generated by the plurality of components,

wherein

the computing means has a mathematical model with which functional relationships of the plurality of components, optionally including the connection means, can be computed so that component-wide faults and/or faults relating to the connection means can be determined in a targeted manner in the motor vehicle from the component data.

2. The device as claimed in claim 1, which can be centrally used for fault diagnosis for all of the plurality of components of the vehicle system including the connection means.

3. The device as claimed in claim 1, wherein the component data from the plurality of components comprise status data which are not processed with respect to fault diagnosis.

4. The device as claimed in claim 1, wherein the component data from the plurality of components comprises status data or fault data which have been preprocessed with respect to fault diagnosis.

5. The device as claimed in claim 1, further comprising a function means for executing a vehicle function.

6. Vehicle system with a plurality of functional components networked to one another, comprising a connection means and at least one device as claimed in claim 1.

7. The vehicle system as claimed in claim 6, wherein model-based self-diagnosis can be carried out with at least one of the plurality of components.

8. Process for on-board diagnosis of a vehicle system, said system comprising a plurality of functional components which are networked to one another, by recording and evaluating component data of the plurality of components, wherein for evaluation of the component data a mathematical model is used with which functional relationships of the plurality of components, optionally including the connection means, are computed for networking of components so that component-wide faults and/or faults relating to the connection means can be determined in a targeted manner in the motor vehicle from the component data.

9. The process as claimed in claim 8, wherein fault diagnosis is centrally carried out for all of the plurality of components.

10. The process as claimed in claim 8, wherein the component data from the plurality of components comprise status data which are not processed with respect to fault diagnosis.

11. The process as claimed in claim 8, wherein the component data from the plurality of components comprises status data or fault data which have been preprocessed with respect to fault diagnosis.

12. The process as claimed in claim 8, wherein component-wide model-based diagnosis is carried out in at least two of the plurality of components.

13. The process as claimed in claim 8, wherein model-based self-diagnosis is carried out in at least one of the plurality of components.