Huf Baolong Electronics Bretten RDKS-RE-1 Tire Pressure Monitoring System User Manual users manual 2

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Document ID	156125
Application ID	YMA6U/0u/zE9n8QFwGxsYw==
Document Description	users manual 2
Short Term Confidential	No
Permanent Confidential	No
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Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	89.77kB (1122155 bits)
Date Submitted	2001-06-22 00:00:00
Date Available	2001-06-20 00:00:00
Creation Date	2001-06-19 09:27:21
Producing Software	Acrobat 4.05 Scan Plug-in for Windows
Document Lastmod	2001-06-19 09:27:42
Document Title	users manual 2
Document Creator	Acrobat 4.05 Scan Plug-in for Windows

of a the due to squeezing caused by
fast driving at low tire pressure will be
avoided. 85 0/0 of the cases in which a
tire bursts are the consequence of
slow pressure losses.
In the case of a sudden puncture
during driving, the driver Will be given
a warning immediately. It a puncture
occurs when the vehicle is at a stand~
still, the driver Will be given a warning
when starting.
If a car is equipped With special emer-
gency tires, the driver Will not have to
stop in the case of a puncture, but
may continue Tor a limited distance at
reduced speed. In such cases, however,
the lateral traction of the tires Will
deteriorate, There is the possibility that
the driver does not notice the pressu-
re loss and continues tor a too long
distance or at an excessive speed. For
this reason, such tires must under all
circumstances be equipped with a tire
pressure monitoring system. Option—
ally, the tire pressure monitoring
system can be combined with a war-
ning system which Will be activated if
somebody tries to damage the tire.
I Comfort
At present, the driver's manual give
the adVice to check the tire pressure
every fortnight. The permanent con-
trol of the tire pressure reduces the
frequency of checks. The tiresome
handling of the filling equipment at
the serVice stations and the removal of
the valve caps is to be carried out only
when it is actually required.
The properly ad justcd tire pressure
guarantees optimum driving comfort
in respect to the rolling noise. suscep—
tibility to vertical shocks and to the
influence of transverse grooves.
After a change of wheels (eg. Winter
tires] the system is able to recognize
the new wheels automatically and to
assign their mounting position.
As an option, the spare tire can be
included into this control system,
I Service Life and Economy
The correct tire pressure will minimize
the wear of the tire. A pressure reduc~
tion of 0.3 bar will reduce the service
life of tires by up to 25 “la.
The fuel consumption will be reduced
2.2 Tire pressure control during
driving
The main function of this system is the
permanent control of the tire pressure
during driving. The tire pressure to be
controlled will either be set by the driver
and transmitted to the system by pres—
sing a button, or it exists as a specific
default pressure. The default pressure
is checked by the system for plausibi-
lity before accepting this value [corri-
parison of the rated pressure at each
axle). lfthe tire pressure is correct. the
new pressures will be used as the basis
for the control process. If not, the dri~
ver is called to carry out a correction.
During service under normal condi-
tions, the tire pressure changes only
slowly. Typically, the pressure gradually
decreases as a consequence of diffusion
which is reliably recognized by the
system when the values fall below the
respective warning thresholds. In
general, tires burst as a consequence
of predamage which takes effect in
combination with insufficient pressure,
There are only very few cases in which
the pressure loss occurs in an extremely
short period, e. 9, when the tire bursts.
in this case, the driver will first notice
the reactions of the vehicle before he
Will be able to react on even the fay
test realizable control system.
2.3 Warning
In the calculation of the warning limits,
the isochoric relation between pressure
and temperaturc is used. A continuous
warning precision can thus be main~
tained throughout a wide temperature
range. The system calculates the appli-
cable limit values for the current tire
temperature from the rated pressure
and the calibration temperature. if the
values fall below the respective limits,
the control unit will transmit the
corresponding signals to the driver
information system in dependence on
the pressure difference.
There are two types of warning at
insufficient pressure:
I ,,Remind" (soft warning)
The characteristic feature of the ope-
rating condition ,,remind" is a reduced
tire pressure which. however, still allows
safe driving, The driver will be asked to
correct the pressure when the oppor
tunity arises, either when ignition is
turned on or during driving.
I "Puncture“ (hard warning]
The characteristic feature of the opera—
ting condition .,puncture" is for the im-
possibility of guaranteeing driving safety.
The driver is asked to stop and to check
the state of the tires. The decision ,
whether to continue unti! the next repair I
station or to change the wheel or
whether the on-site application of a ,
power spray (sealant) is required lies in
his responsibility.
2.4 Independent Wheel Recognition
and Assignment of Wheel Position
An important function of the system is
Typical variation of the pressure in dependence
. or time with the transitions in .,snlt warning"
and .hard warning"

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