| 摘要 |
PURPOSE: A device for automatically injecting air into a vehicle tire is provided to work a solenoid valve by controlling by changing an analog output signal of a semiconductor pressing sensor, to a digital signal after correctly analyzing. CONSTITUTION: The device has two methods for injecting air into the vehicle tire. One controls a solenoid valve(4) for injecting air, until a real tire inner pneumatics reaches the set pneumatics by working the solenoid valve if the set pressure is lower than the tire pressure after inputting the tire inner pneumatic air and the supplied air from pressed air supplying source(2), to a control panel(6) by a control program embedded in a microprocessor(8) after sensing the pneumatics and pressed air by using a pressure sensor(7) embedded in the injecting device. The other controls a solenoid valve(11) for discharging air, until the real tire inner pneumatics reaches the set pneumatics by working the solenoid valve if the set pressure is higher than the tire pressure.
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