Tire Monitoring System: Description and Operation

Tire Pressure Monitoring Generation 2.5

Timely detection of a gradual loss of pressure not only increases driving safety, but can also prevent uneven tire wear and high fuel consumption due to inadequate tire pressure. The correct tire pressure additionally supports safe driving and high driving dynamics.

With the tire Pressure Monitoring system (TPM Generation 2.5) provided as standard equipment on all Cayenne models, the tire pressure of the running tire is monitored permanently and separately for all four wheels.

Compared with the TPM Generation 2.2, which was installed in the Cayenne as from model year 2008, the antenna is now integrated in the control unit in the new TPM Generation 2.5. The functions have not changed.

Design

The system comprises the following components







Control unit







The TPM control unit with integrated antenna is fitted on the outside on the vehicle underbody. The control unit is water-tight. The underbody panelling serves as mechanical protection for the control unit. The location of the control unit on the outside of the vehicle ensures that wheel electronics reception is not subject to interference as a result of various conditions in the passenger or luggage compartment or due to metallized heat-insulating glass.







The control unit requests the four trigger transmitters to transmit in succession by means of a PWM signal. The 125 kHz signal is received by the respective wheel electronics units. The data protocol transmitted by the wheel electronics is received by the antenna integrated in the control unit.