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In order to cope with the rapid development of the ITS and the future information society, it has become necessary to build an in-vehicle information network system with high expandability which is capable of safely providing an increasing volume of information to passengers. This networking will not only promote the standardization of various instruments, but will also make it possible to integrate SW and display functions which are attached to those individual instruments and to make them more independent, thereby allowing the existing instruments to be more clearly visible and more easily operable. In this paper, the relationship between visual-recognition time and operation time in the display-operation system (as a human interface with the center cluster section when the above-mentioned network was designed) will be evaluated using a simulator.

In order to achieve the Intelligent Transport Systems (ITS), it is necessary to install more and more information/ entertainment and communication electronics into vehicles. However, because of space availability and device operability in current vehicles, there exist constraints which hinder the installation of multi-media devices. In this paper, some solutions for this problems used in the in-vehicle information network system will be described.

Virtual instruments for motor vehicles are already used on several car models to improve visibility and reduce the size of display devices (by utilizing the optical enlargement technique). The merits of a virtual instrument are gradually recognized. The performance of a conventional virtual instrument allows a display distance of approximately 80 mm and an enlargement factor of 1.3 times. Better results would be obtained if the performance is further improved. The virtual instrument which has been developed by us improves these features to 200 mm and 1.5 times, respectively, by using an optical design which is different from a conventional system. The present paper describes the result of evaluation of visibility, structure and design technique for the new virtual instrument.