The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 1989
Filed:
Dec. 16, 1987
Shigetoshi Doi, Hiroshima, JP;
Yoshiaki Anan, Hiroshima, JP;
Hirofumi Nagaoka, Hiroshima, JP;
Katsumi Iida, Konan, JP;
Yoshihiko Sakurai, Konan, JP;
Mazda Motor Corporation, Hiroshima, JP;
Diesel Kiki Co., Ltd., Tokyo, JP;
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 abnormality lacks repeatability such as an imperfect contact and a half-disconnection.