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10 DIAGNOSTICS

Figure 10.14
Environment of an
Expert System

FPO

development work. A summary of expert system development tools that are
applicable for a mainframe computer is presented in Table 10.3.
It is common practice to think of an expert system as having two major
portions. The portion of the expert system in which the logical operations are
performed is known as the inference engine. The various relationships and basic
knowledge are known as the knowledge base.
The general diagnostic field to which an expert system is applicable is one
in which the procedures used by the recognized experts can be expressed in a set
of rules or logical relationships. The automotive diagnosis area is clearly such a
field. The diagnostic charts that outline repair procedures (as outlined earlier in
this chapter) represent good examples of such rules.

Table 10.3
Expert System
Developing Tools for
Mainframes
Name Company Machine
Ops5 Carnegie Mellon University VAX
S.1 Teknowledge VAX
Xerox 1198
Loops Xerox 1108
Kee Intelligenetics Xerox 1198

Art Inference Symbolics

356 UNDERSTANDING AUTOMOTIVE ELECTRONICS