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1. Constitution of the Tire Pressure Monitoring System
for vehicle
Tire Pressure Monitoring System is the system that receives the information, from transmitters installed at
each tire, about the inflation pressure or temperature of tires detected by the sensor, so that the system can
detect the abnormality of tires like fallen inflation pressure. This system consists of transmitter, receiving
antenna, and receiver. The transmitter sends information of tire, read by the sensor, in the form of radio
wave at constant intervals. The receiver is fixed inside the vehicle. If IG is OFF, it works intermittently to
prevent the battery exhaustion. When the receiver detects the synchronous code and IG is ON, it runs
continuously to receive the signals completely. If the received code is normal, the system will not inform
the user. As shown below, in the case that the transmitter sends information that the tire is in abnormal
condition, and that the receiver system has a trouble, the system will inform the user with lighting up
Warning bulb.
TPMS Warning bulb is lit by the following situations.
Bulb disconnection detection output( The warning light is On for 3 sec. when IG=OFF→ON)
Tire air pressure warning output (Warning light is ON)
System warning output (Warning light is blinking)
Transmitter 1
Pressure sensor
CPU
Transmitter 2
Transmitter 3
Transmitter 4
Transmitter (Spare Tire)
-
Tire
Transmission circuit
Figure 2-1 System Architecture
Inside Antenna
- 3 -
Receiver
EEPROM
CPU
Bulb
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