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Image forming apparatus provided with self-diagnosis and self-repair system
| Details |
Inventors: Umeda, Yasushi; Motegi, Yasuo; Tomiyama, Tetsuo; Yoshikawa, Hiroyuki; Shimomura, Yoshiki;
Assignee: Mita Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Nguyen; Hoa T.
Assistant Examiner:
Attorney, Agent or Firm: Beveridge, DeGrandi, Weilacher & Young
The amount of degradation, converted into a fuzzy qualitative value, is found on the basis of state data sensed by sensors 1a, 1b and 1c and degradation data. The value of a parameter changed by the amount of degradation is represented by a fuzzy qualitative value. In addition, the state data is converted into a fuzzy qualitative value, and it is judged by the value whether or not a fault exists. As a result, if a fault exists, fault diagnosis is made utilizing, as an initial value the value, of the parameter changed by the amount of degradation, and the causes of the fault are specified by comparing the result of the diagnosis with the state data converted into the fuzzy qualitative value. The causes of the fault specified are repaired by operating corresponding actuators 6a, 6b and 6c. Since the causes of the fault are specified while handling the fuzzy qualitative value, the causes of the fault can be specified more precisely. Accordingly, it is possible to achieve an image forming apparatus in which autonomy is high and repair labor is reduced. |
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DETAILED DESCRIPTION An object of the present invention is to provide an image forming apparatus having a system capable of developing inference admitting ambiguity from the point of view of maintenance, making self-diagnosis of the state of an apparatus using the inference and making self-repair thereof as required.
The self-diagnosis and self-repair system according to the present invention calculates as a fuzzy qualitative value the amount of degradation relative to the time elapsed after the image forming apparatus starts to be used up to the present time on the basis of state data sensed by sensor means as well as degradation data containing degradation factors and respective membership functions of the degradation factors.
The value of a parameter changed by the amount of degradation calculated is converted into a fuzzy qualitative value using membership functions of the parameter, and is replaced with an expression used on qualitative data.
In addition, data sensed by a plurality of sensor means is converted into a fuzzy qualitative value using the membership functions of the parameter, and it is judged on the basis of the fuzzy qualitative value whether or not a fault exists.
If it is judged that a fault exists, fault diagnosis is made utilizing as an initial value the value of the parameter changed by the above described amount of degradation.
The result of the diagnosis is outputted as an expression having ambiguity.
Furthermore, the causes of the fault are specified by comparing the fuzzy qualitative value obtained by the conversion from the output of the sensor means with the result obtained by the fault diagnosis.
More specifically, when a plurality of fault candidates are taken up as a result of the fault diagnosis, a fault candidate which best coincides with the actual state of the apparatus is examined.
Consequently, the actual fault state is outputted more accurately.
A predetermined one of a plurality of actuators is operated by repair means to repair the fault.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the Present invention when taken in conjunction with the accompanying drawings
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