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Through CAE (Computer Aided Engineering) analysis, a method in verifying the reliability of wire harnesses has been developed. The relative displacement of the engine causes the battery cable to bend repeatedly; this may result in cable breakage. By investigating the breakage mechanism of battery cables, we have found a correlation between the strain change and cable breakage. Furthermore, the dynamic profile through CAE analysis has been established, and it is also possible to calculate its strain. Using this method, we can limit the amount of actual tests and predict the bending life of battery cables.

This paper describes a display unit for automotive navigation systems. The distinguishing feature of this display unit is the fact that it employs a 5.6 inch TFT-LCD (Thin Film Transistor Liquid Crystal Display) for on-vehicle use. Compared with a 6-inch CRT, the unit has an expanded effective display area (screen) for improved readability, as well as greater compactness (for savingspace), lighter weight, and lower power consumption. In terms of reliability, the display unit outperforms conventional LCDs due to its wider working temperature range and outstanding resistance to thermal shock. In terms of operation, the system employs a combination of infrared touch switches, hard-key switches and a joy stick to ensure safety and ease of operation. The 1994 Model MAZDA “SENTIA” is equipped with this newly developed display unit for an automobile navigation system.