Patent attributes
A tire pressure indicator (TPI) (10) that provides a method by which the air pressure in vehicle tires can be easily and reliably checked to determine if the tires are optimally inflated. The TPI (10) is comprised of a valve core (12) that replaces a conventional tire-valve core that is inserted into a vehicle tire stem (170). The valve core (12) includes a diaphragm (64) that controls the vertical displacement of a plunger shaft (80) that controls the contact position of a switch (S1). From the switch (S1) a high or a low tire-pressure signal is transmitted to a tire pressure monitoring unit (160), from where an individual can observe and correct the tire pressure. The TPI (10) features a structure and a method by which false tire pressure signals caused by changes in ambient temperature and normal tire temperature fluctuations are eliminated.
