Chassis
Page 4.13
External features of the new, trigger-activated wheel electronics unit “1st gener-
ation” vs. “2nd generation.”
The following aspects of the system have been optimized by
changing the system hardware and software:
Fast learning following a wheel change. The wheels of a newly mounted
set of wheels are assigned within one minute – often even within a few
seconds of selecting the set of wheels in the “Tire pressure” menu and
the pressure values are displayed.
Fast Detection of a Wheel Change Without Re-Calibration
If the TPM system is not re-calibrated following a wheel change, the
system detects this within max. 3 minutes of driving the vehicle and
generates the message “Wheel change? Make new selection” in order to
ensure that the correct nominal pressure is configured for the moni-
toring process by selecting the correct tires.
Immediate Pressure Display at the Start of Each Trip
The TPM control unit knows which wheel set is mounted on the vehicle
once the teaching process is complete. The tire pressure values are
available as soon as the vehicle is started since the trigger cycle starts
immediately once the door is opened and the wheel electronics units
have sent the latest data to the control unit.
Fast Pressure Update Following Tire Pressure Adjustment
The differential pressure display filling information in the “Tire pressure”
menu is still available when the vehicle is stationary in order to ensure
that the tires are filled correctly. As soon as this information is called up,
a fast pressure update is generated over a time span of max. 15
minutes and this update information shows the current tire pressure
every 10 seconds during tire pressure adjustment.
A - Wheel electronics unit “1st Generation”
B - Wheel electronics unit “2nd Generation”
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