Patent ID: 6943674
Filing Date: 2005-09-13
Classification: B60C

Abstract:
1. A tire pressure indicator installed in one tire of a motor vehicle and adapted to indicate the tire pressure of the tire, the tire pressure indicator comprising: a hollow annular pressure cell, said hollow annular pressure cell having one side fixedly concentrically fastened to an inner side of the rim of said tire, an opposite side provided with a diaphragm that displaces subject to the condition of the tire pressure of said tire; a displacement sensor mounted in the wheel axle holder supporting said tire and adapted to detect axial displacement of said diaphragm and to produce a corresponding modulated signal; a signal processor electrically connected to said displacement sensor and adapted to provide excitation signal to said displacement sensor and to process the outputted modulated signal from said displacement sensor into a corresponding tire pressure signal through a series of processing processes including demodulating, filtering, amplifying and scaling; a pressure display electrically connected to said signal processor and adapted to display the value of the tire pressure signal outputted from said signal processor; and a link tube connected between said hollow annular pressure cell and said tire to keep the internal air pressure of said hollow annular pressure cell in balance with the internal air pressure of said tire.