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Published on September 22, 2004


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Date Published September 22, 2004
There are two types of tire pressure monitoring systems (TPMS) in the world. One is an indirect TPMS based on the wheel speed signal data from ABS/ESP sensors. The other is a direct system based on a tire pressure sensor. The indirect TPMS systems for the most part have been unable to detect a 4-wheel simultaneous deflation condition (i.e. diffusion deflation) because the system detects the deflation by comparing the 4 wheel speeds with each other. In this paper, we discuss a method to detect diffusion deflation by using only the wheel speed signals. 
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