Troubleshooting apparatus for automobile air-conditioning system
US4827730A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 16, 1987 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Dec 16, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60H1/00978
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A troubleshooting apparatus counts the number of times an abnormality occurs whenever each diagnosed portion of an automobile air-conditioning system repeats an abnormal and a normal status, stores each diagnosed portion in which an abnormality is detected and the number of times the abnormality of each diagnosed portion occurs in a nonvolatile memory, recognizes each diagnosed portion having the number of times the abnormality exceeds a predetermined value at the time of troubleshooting as a fault, and recognizes each diagnosed portion having an abnormality that occurs at the time of troubleshooting as a fault. Abnormalities that occur in conjunction with the dismounting and remounting of diagnosed portions during checking processes are absorbed in the number of times the abnormality occurs within the predetermined value so that a wrong diagnosis can be avoided. Moreover, each diagnosed portion having the number of times the abnormality exceeds the predetermined value and each diagnosed portion having an abnormality that occurs during the diagnostic process can be distinguished from each other. Consequently, check and repairs can be based on an understanding of whether or not the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.