| 摘要 |
A device for monitoring the air pressure in the tyres of vehicle wheels relates to the transport industry and, in particular, to devices for monitoring a drop in air pressure in the pneumatic tyres of the wheels of a moving automobile. The device for monitoring the air pressure in the tyres of the wheels of a vehicle comprises two induction transducers (1, 2) in the form of permanent magnets (3, 4) capable of being mounted on the corresponding wheels, and induction coils (5, 6) capable of being mounted on the stable part of the vehicle and interacting with the corresponding magnets, as well as a unit (8) for signal processing and indicating comprising two information light-emitting diodes (9, 10), a blocking diode (11), an indicating light-emitting diode (12) and a shunting resistor (13). An air pressure change in the tyres of the wheels results in changes of their radii and corresponding changes in their rotation frequencies. The wheel condition information signals which are generated in the induction coils (5, 6) come through a communication channel (7) to the light-emitting diodes (9, 10) which register the rotation frequencies. The indicating light-emitting diode (12) differentiates between these frequencies. The blocking diode (11) protects the indicating light-emitting diode (12) from reverse voltage and the shunting resistor (13) is chosen so that the indicating light-emitting diode (12) is illuminated only in the case of coincidence of the pulses on the light-emitting diodes (9, 10). The illumination frequency of the light-emitting diode (12) allows the difference of air pressure in the corresponding pair of wheels of the automobile to be assessed. |
