Method for analyzing a measurement value and measurement value analyzer for carrying out the method

• US 5,835,886 A
• Filed: 04/28/1997
• Issued: 11/10/1998
• Est. Priority Date: 10/26/1994
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Scheil, Hermann
• Primary Examiner(s): Trammell, James P.
• Application Number:
  US08/847,890
• Time in Patent Office: 561 Days
• Field of Search: 364/550, 364/551.01, 364/551.02, 395/902, 395/904, 395/906, 395/911, 395/912, 395/914, 395/915, 702/179-185, 702/190, 702/194, 702/196
• US Class Current: 702/179
• CPC Class Codes: G01D 18/00 Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
• CPC Class Codes: G01D 3/08 with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown
• CPC Class Codes: G05B 23/0221 Preprocessing measurements, e.g. data collection rate adjustment; Standardization of measurements; Time series or signal analysis, e.g. frequency analysis or wavelets; Trustworthiness of measurements; Indexes therefor; Measurements using easily measured parameters to estimate parameters difficult to measure; Virtual sensor creation; De-noising; Sensor fusion; Unconventional preprocessing inherently present in specific fault detection methods like PCA-based methods
• CPC Class Codes: G05B 9/02 electric

Abstract

A method for analyzing or conditioning a measurement value identified in a system process of a measurement system and a measurement value analyzer for carrying out the method, test the measurement value for plausibility at a first comparison point with reference to characteristic variables specific to the measurement system. In order to achieve a particularly high degree of reliability when monitoring the measurement value for errors, the consistency of the measurement value with measurement parameters identified independently of the measurement value, is tested at a second comparison point with reference to rules characteristic of the system process. A confidence factor for the measurement value is identified in dependence on a result of the testing.

Claims

1. A method for analyzing a measurement value, which comprises:

testing a measurement value identified in a system process of a measurement system for plausibility at a first comparison point with reference to characteristic variables specific to the measurement system;

deriving a desired value for the measurement value from measurement parameters identified independently of the measurement value with reference to rules characteristic of the system process;

testing consistency of the measurement value with the derived desired value at a second comparison point; and

identifying a confidence factor for the measurement value in dependence on a result of the testing.

2. The method according to claim 1, which comprises updating the rules characteristic of the system process by the measurement value.

3. A measurement value analyzer for analyzing a measurement value identified in a system process of a measurement system, comprising:

a characteristic variable memory for a measurement system having a system process identifying a measurement value;

a first comparison module connected to said characteristic variable memory;

a data memory for measurement parameters identified independently of the measurement value;

a second comparison module connected to said first comparison module and to said data memory, for deriving a desired value for the measurement value from the measurement parameters by rules characterizing the system process; and

an evaluation module connected to said second comparison module for identifying a confidence factor for the measurement value.