Method for model-based diagnosis of a mechatronic system

• US 8,229,620 B2
• Filed: 05/15/2006
• Issued: 07/24/2012
• Est. Priority Date: 06/03/2005
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Lehle, Walter, Assfalg, Jochen, Fritz, Martin, Allgoewer, Frank
• Primary Examiner(s): Culbreth, Eric
• Assistant Examiner(s): Spisich, George D.
• Application Number:
  US11/920,610
• Publication Number:
  US 20090187303A1
• Time in Patent Office: 2,262 Days
• Field of Search: 701/29, 701/31, 701/33, 701/34, 701/35, 340/438, 340/445, 348/211.3
• US Class Current: 701/31.8
• CPC Class Codes: G05B 23/0213 Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
• CPC Class Codes: G05B 23/0243 model based detection method, e.g. first-principles knowledge model
• CPC Class Codes: G05B 23/0264 Control of logging system, e.g. decision on which data to store; time-stamping measurements

Abstract

A method for model-based diagnosis of a mechatronic system. A control unit within the mechatronic system performs error detection and an arithmetic unit outside of the mechatronic system performs error identification.

Claims

1. A method for model-based diagnosis of a mechatronic system, comprising:

storing, in a temporary ring memory, values for at least one input variable of system inputs and actual values of at least one output variable of system outputs and a time vector;

performing error detection via a control unit within the mechatronic system by comparing the actual values for the at least one output variable to a setpoint value;

upon detection of an error, transferring from the temporary memory to a permanent memory values of the at least one input variable and values of the at least one output variable during a specified time segment which surrounds a direct point in time of the error occurrence; and

performing error identification via an arithmetic unit outside of the mechatronic system using the values transferred to the permanent memory.

2. The method as recited in claim 1, further comprising:

combining error detection data and error identification data into a complete error diagnosis.

3. The method as recited in claim 1, wherein in the error detection, a setpoint value for the at least one output variable is subtracted from an actual value of the at least one output variable of the mechatronic system to form a residue, an error being detected if an absolute value of the residue exceeds a maximum allowable detection threshold value.

4. The method as recited in claim 1, wherein information-containing values of the at least one input variable and the at least one output variable during the specified time segment are selected.

5. The method as recited in claim 1, wherein for the error identification, data are read out of the permanent memory within the mechatronic system via a diagnostic interface and transferred to the arithmetic unit outside of the mechatronic system.

6. A diagnostic system for model-based diagnosis of a mechatronic system, comprising:

a control unit situated within the mechatronic system; and

an arithmetic unit situated outside of the mechatronic system;

wherein the control unit is configured to perform error detection of errors occurring in the mechatronic system by performing;

storing, in a temporary ring memory, values for at least one input variable of system inputs and actual values of at least one output variable of system outputs and a time vector;

performing error detection by comparing the actual values for the at least one output variable to a setpoint value; and

upon detection of an error, transferring from the temporary memory to a permanent memory values of the at least one input variable and values of the at least one output variable during a specified time segment which surrounds a direct point in time of the error occurrence; and

wherein the arithmetic unit is configured to perform error identification of detected errors using the values transferred to the permanent memory.

7. A non-transitory computer-readable data storage medium storing a computer program, the computer program, when executed by a computer, causing the computer to control a mechatronic system to perform the following steps:

storing, in a temporary ring memory, values for at least one input variable of system inputs and actual values of at least one output variable of system outputs and a time vector;

performing error detection via a control unit within the mechatronic system by comparing the actual values for the at least one output variable to a setpoint value;

upon detection of an error, transferring from the temporary memory to a permanent memory values of the at least one input variable and values of the at least one output variable during a specified time segment which surrounds a direct point in time of the error occurrence; and

performing error identification via an arithmetic unit outside of the mechatronic system using the values transferred to the permanent memory.