Design methodology for self-maintenance machines
This chapter describes a design methodology for self-maintenance machines. The self-maintenance machine is a machine that can maintain its functions for a while, even though faults happen. In contrast, a traditional machine may not work at all in such a case. The self-maintenance feature increases the availability of the machine, improves the fault-tolerance, and reduces the maintenance costs. For instance it may reduce sudden, unscheduled maintenance. We illustrate the concepts, reasoning methods, and practical examples of self-maintenance machines. First, we discuss the concept of functional maintenance that includes two types of self-maintenance strategies, i.e. control type and function redundant type. Second, a model-based approach that employs qualitative physics is proposed, as the reasoning technique. Third, we illustrate two examples of self-maintenance machines that we have developed; namely, a commercial photocopier with the control-type self-maintenance capability and a prototype of the function-redundant self-maintenance photocopier.
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