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It is well known that tire pressure lower than normal reduces the safety of the vehicle. In consideration of active safety, a new tire pressure warning system for Advanced Safety Vehicle (ASV) has been developed. This involves the four mechanical pressure sensors, a simple structure on each wheel. This system can independently detect pressure of each tire with a high degree of precision under a broad range of vehicle speeds, and requires no adjustment. This paper describes the principle and the performance of this system.

A complete multiplex system intended primarily for Class A applications was implemented in a sub-compact car and potential wire harness reductions such as weight, number of wires, and other factors were evaluated. It was found that a multiplex system can have a considerable effect in simplifying the harness, particularly in reducing its weight.