| US 7,542,876 B2 | ||
| Method of and apparatus for evaluating the performance of a control system | ||
| Ashish Singhal, Glendale, Wis. (US); and Timothy I. Salsbury, Whitefish Bay, Wis. (US) | ||
| Assigned to Johnson Controls Technology Company, Holland, Mich. (US) | ||
| Filed on Jun. 25, 2004, as Appl. No. 10/876,854. | ||
| Prior Publication US 2005/0284160 A1, Dec. 29, 2005 | ||
| Int. Cl. G06F 11/30 (2006.01); G06F 11/00 (2006.01) | ||
| U.S. Cl. 702—185 [702/188; 702/190; 702/193; 701/9] | 35 Claims |
| 1. A method of evaluating the performance of a control system, the method comprising:
acquiring an error signal associated with the control system;
calculating a measure of symmetry of a half-cycle of the error signal;
comparing the measure of symmetry with a predetermined value;
determining a cause of an oscillation in the control system based on the comparison; and
completing at least one of displaying the determined cause of the oscillation on an electronic display and storing the determined
cause of the oscillation in a memory device.
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