Bendix Commercial Vehicle Systems RX355MS Receiver for the SmarTire Signal Passenger Car Tir User Manual FCC stmt on 1st page

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Date Submitted	1999-06-29 00:00:00
Date Available	1999-08-09 00:00:00
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HP Tire Monitoring System
Disclaimer
Pi Research Limited makes no representation or warranties of any kind whatsoever with
respect to the contents hereof and specifically disclaims any implied warranties oI
merchantability or fitness for any particular purpose. Pi Research Limited shall not be
liable for any errors contained herein or lot incidental or consequential damages in
connection with the furnishing, performance or use at the soltware, associated hardware,
or this written materialt
Pl Research Limited reserves the right to revise this publication from time to time, and to
make changes in the content hereof without obligation to notify any person of such
revision or changes.
A copy ol the Pi Research Terms and Conditions at Sale is available on request. and
includes a declaration oi the warranty and limitation of liability which apply to
all Pi Research products and services.
Health and Safety information
Under the terms at European and UK i-teatth anu Salely Legislation Pt nesearcn is requireu tc ciasstiy any
hazardous materials in the products it supplies and to preyiae relevant saieiy inlormatlon to users
Any hazardous materials in Pi products are clearly marked wtiii appropriate symbols Product Safety Data sheets
relating to these materials are mllable on request
FCC regulations
This device complies will’t Pall I5 cl the FCC Rules Operation is Subject to the lollowlng IWO conditions: 11] Ihis
device may not cause harmful interference and la; Ihts uevipc must acceol any intenerence received, Including
tnterlereuce that may cause undesired operation.
This equipment has been tested and lound to comply with the limits lot a Class a digital device, pursuant to Part
l5 ot the FCC Rules These limits are destgnsd to provtde reasonable protection against harmtul tnterterence in
a residential installation. This equipment generates uses amt can raniaic radio trequency energy and‘ it not
installed and used in accordance with the instructions. may cause haimtut inlerteience to ramp communications
However. there is no guarantee that interterence Will not occur in a particular installallonv
II this equipment does cause harmtui inierterence to radio or television reception, which can be determined by
turning the equipment on and on, the user is encouraged to try to correct the tnlerletence by line or more at the
following measures
a Reanenl m‘ letocatc ilre mowing antenna
.\‘ increase the separation tntweefl the equipment and receiver
i- connect the equipment into an outlet on 1 Uncut! miterrnt 1mm that to which the receive! is connected
w consult me neuter or an experienced radio/TV lachnictut for help
Change: or mop-teams tn inn device without the express approval at P4 Research inc may vote the users authomy to use this
demo
——_—_——__
2 High Precision Tire Monitoring System Application Note
Contents
Introduction
Tire Monitoring System: Overvrew ,
System requirements
Installation
Installing lhe TMS receiver
installing the TMS receiver antenna
Filting TMS wheel lixtures .
Removing and checking TMS wheel fixtures .......
Cleaning the Transmitter assembly cap
Calibration and testing ..
Calibrating TMS channels A
PIS-422 debug channels
Testing TMS transmitters .,
Using the Tire Monitoring System
Specifications
TMS transmitter .
TMS receiver ..
Dimensions ..
TMS wheel lixtur
TMS wheel bolts
TMS receiver
Parts numbering
HP TMS kit l
HP TMS kit 2.“
HP TMS receiver ki
HP TMS case and accessories
Relurbishment and repair details
Contact Intormatlon
Safety information
The Pi Tire Monitoring System (TMS) is designed to be fitted and used with specially
modilied wheels, Modilicalions to wheels must only be made by the wheel manufacturers
and approved by the relevant motorspon regulatory authorities Under no circumstances
must wheel modifications be carried out by anyone other than the wheel manufacturers
Pi Research do not take responsibility for use of the Tire Monitoring System when fitted
to non-approved modilied wheels
Before using the Tire Monitoring System the engineeris) responsible for fitting the system
should read this application note carelully, and consider the following points.
as
Follow the installation instructions provided,
Use only TMS wheel bolts of the correct length, and Dowty washers
supplied by PL
Record the use of each TMS wheel lixture and schedule relurbishment lor
the end of each season or when a tailed transmitter is found.
Have your wheels and TMS wheel bolts frequently tested for cracks.
Cmck test the TMS wheel bolts before high speed races such as super
speedways,
Check TMS wheel fixtures lor signs of the cap moving by checking the
paint spot on the joint of the cap and the transmitter case. If there are signs
of movement then the TMS wheel fixture should not be used until the cap
has been removed, cleaned, resealed, and tightened to the correct torque.
Remove TMS wheel fixtures from wheels after each race or practice
session.
Store Tire Monitoring System equipment in the protective case supplied.
Higii Preclslon Tire Monitonnq System Application Note
Introduction
The setup oI a high performance race car is very sensitive. The rolling radius ot a tire is
critical to the ride height and consequently, the aerodynamic performance and balance.
The speed at which a car can corner is a function of the lateral and vertical stiffness of
the tire, and the physical properties oi the tread rubber.
Some of the stiffness is generated by the inflation pressure holding the sidewall in
positron. It has been calculated that tor a typical racecar tire, a 2 PSI change in inllation
pressure equates to a 100 Ibffin change in the tires vertical spring rate
Changes in vertical spring rate result in a change in the dynamic reactions oi the car, if
the change in inflation pressure is gradual, then the change in dynamic reaction will be
small. it there is a rapid change in pressure the whole we may fail mechanically with
disastrous results.
The Tire Monitoring System is designed io proi/ide early warning oi potential tire tailure
by measuring inflation pressure The pressure daia can be logged or sent to the pits using
real-time telemetry equipment to provide lap-by-tap monitoring oi tire condition. By careful
observation oi the data, race engineers can make informed decisions. and avoid
potentially dangerous situations.
Tire Monitoring System:
Overview
FIL whee/[Mule antenna FL wheel/”(lure
an wheel [um/re ms [Been/sf FF! whee/1mm
The Tire Monitoring System comprises a car mounted radio receiver and tour wheel
fixtures (transmitter assemblies)
Transmitter assemblies
Each transmitter is powered by two lithium batteriesvTo increase battery life. transmission
only occurs when wheel motion is detected,
Identifies/Ian
To ensure that data from other cars is not received, each transmitter is programmed with
position intormation and a unique Team Identification. The receiver is programmed to
recognize only one Team Identification,
5 ngh Precision Tire Monitoring Syslem Application Note
To make it easier to relate TMS wheel fixtures to wheel position they are color-coded.The
lollowing table details the position and color at TMS wheel llxtures.
Wheel positions are as the driver would see the wheels when sealed in the car,
Wheel TMS wheel fixture label Label color
Rear right 01BA050391-RH whlte
Rear left OI 8-050391 rFtL yellow
Front left 018-05039l-FL red
Front right 018-050391vFFt blue
When a new transmitter is fitted to the car. lor example during a pit stop, the receiver first
learns the Team Identification ol the new transmltter belore sending pressure data to the
tagging system
Pressure data
When wheel motion is detected and the transmitterTeam Identification has been learned,
inflation pressure data is transmitted even/ 5 seconds lt the inllation pressure changes
by 110 PSI then the pressure data is transmitted every 1 25 seconds until the pressure
stabilizes.
As standard, the Tire Monitoring System is set so that lt the change in inllation pressure
is more than 5 PSI, the receiver watts lor a second pressure reading before sending
pressure data to the logging system
This Ieature can be disabled by a request to Pi Customer Support.
Receivers
Each receiver is programmed to only identity data lrom wheel fixtures with the same
unique Team Identification The receiver outputs pressure data lrom the tour wheels as
an RS-422 serial data stream. In addition to the pressure channels, live debug channels
are provided tor lault finding: tour diagnostic channels and a receiver temperature
channel.
For use with data logging systems that do not accept FtS-422 data, the TMS recelver
outputs pressure data as (our O—5V analog signals.
System requirements
To use the Tire Monitoring System you need one of the lotlowing-
Pi System 3+ programmed with boxcode and ECM driver that supports the
Tire Monitoring System,
Pi System 4+ programmed with boxcode that supports the Tire Monitoring
System.
4 Pi System Ssmi or Motor Racing Computer (MRC) programmed with
customer speciltc code, and correct communication ports.
i“ A non-Pi system with tout O—SV analog inputs
Additionally you need:
'~: Pi Analysis sottware that supports the Tire Monitoring System.
You should be familiar with Pi Version 6 soltware and be able to calibrate a sensor
channel.
Pi System looms
From 1996 onwards, Pi System looms have a connector that enables a TMS receiver or
an Octal Serial Junction box to be connected directly to the logging system.
Communication between the Tire Monitoring System and the LCU (Logging Control Unit)
is by an RS-422 data link.
Non-Pi systems
The Pi Tire Monitoring System can be used With non-Pi systems by using the tour 0—5V
analog outputs instead ol the serial communication link. A suitable adapter loom to
connect the TMS receiver to the logging system is required. Connector pin details for the
TMS receiver are provided in this Application Note.
ii High Preciston Tire Monitoring System Application Note
Installation
lnstal ng the TMS
race
er
When installing the TMS receiver:
select a position where the TMS receiver will not be in constant contact wrth
water, fuel, or oil:
protect the TMS receiver trom vibration by mounting the it using antl-
vibratton mounts or Velcro”:
make sure that TMS receiver will not be affected by heat soak;
try not to position the TMS receiver near sources at electrical interterence
eg ignition coils. plug leads, ECMS, telemetry antennas. and alternators
The TMS receiver antenna should be mounted so that there is line-ot-sighl to the wheel
lixtures. The best position tor the TMS receiver antenna is the roll hoop area ol the car.
Use the antenna extension loom to position the antenna remotely.
When installing the receiver antenna:
3;
choose a position for the recelver antenna so that there is Iine-ol-sight from
the receiver antenna to each wheel fixture;
make sure that the receiver antenna is at least t2“ (300mm) trorn other
antennas. and
use the contents ol the antenna installation kit to install the antenna.
To install the TMS receiver using Velcro“:
I.
Select a suitable location lor the TMS recetver,
Make sure that all at the looms that you have to connect to the TMS receiver can reach
the selected position.
2.
3.
4.
Clean and degrease the selected location and the base of the TMS receiver,
Apply the Velcro‘ to the base at the TMS receiver and to the chassis. Press
the TMS receiver Iirmiy and evenly down onto the Velcro“ on the chassis.
Plug the System and antenna looms into the TMS receiver.
Insta ing the TMS
rece ver antenna
Ground planes
The TMS receiver antenna needs a suitable ground plane to operate efficiently, The
ground plane is a conductive material placed at the base of the antenna to increase its
eliiciency.
Generally, the construction and shape cl a race car does not allow for a suitable ground
plane. To use your Tire Monitoring System elfectively you may have to make a suitable
ground plane,
Each TMS receive! antenna comes With an installation kit that includes a piece of self-
adhesive copper to" which you can use to make a ground plane.
When making a ground plane you should consider the following points:
in The antenna should be mounted in a venical position in the centre of the
ground plane.
is The ground plane should be made as large as is possible within the
constraints ol the car body work.
ie The ground plane must not make electrical contact with any part of the
vehicle chassis that is likely to conduct: for example, carbon fibre.
To fit the antenna to a fibre glass body panel:
1. Locate a suitable panel that can be removed easily for access to the antenna
loom.
As fibre glass is electrically nunccnducting, you can stick the copper loil directly to the
underside ol the panel.
2. Drill a hole in the panel for the insulating washers.
3. Assemble the insulating washers on either side of the panel. and tighten the
TNC bulkhead connector. ensuring that it makes electrical contact with the
copper foil.
Ensure that the copper l0il does not make contact with any part of the chassls that is likely
to conduct.
10
High Precision Tire Munlturlnu System Application Note
Tighten the antenna and antenna feed cable to the bulkhead connector, and
refit the panel.
arr/Sims ..
msulallng washer _ TNCbu/kltead
con/redo!
lank tape ”Wm M
l/Lvu/almg washer lac/mg washer
fixing full
We lemma/ed
/eed cab/e
Antenna installallnn delall
To fit the antenna to carbon fibre chassis panels:
1.
2.
3.
Locate a suitable panel that can be removed easily lor access to the antenna.
Make a bracket lrom metal or carbon fibre that will hold the antenna vertical.
Fix the bracket to the chassis
Stick an insulating layer of ‘tank tape‘ to the underside ol the bracket. Make
sure that it is of a larger diameter than lhe copper toll lor the ground plane.
Slick the copper toil to the underside ol the insulating layer.
Tighten the TNC connector at the antenna. ensuring that it makes electrical
contact with the copper loll,
11
6. Ensure ihai the copper loii does no! make coniact with any pan oi the chassis
that is likely lo conduct
7. Drill a hole in (he panel for ma antenna to pass through
Antenna feed loom
Il you are going to use your own anienna feed loom. it should be a high qualiiy coaxial cable
with a stranded inner core. Pi recommend that you use 50 ohm R658 coaxial cable.
For best results, use crimp TNC connectors at bolh TMS receiver and anienna ends of the
feed cable.
WARNING: It is imparlant that {he TNC connectors of the lead loo/n do nat Vibrate
against any other conducting sit/faces such as Lemo con/rectum or the chassis
floor, as this will result in radio frequency noise and a loss uf signal.
___—_..__._—_..—_——_—_—-
12 quh Preclslon Tue Monitoring System Application Note
Fi ling TMS wheel
fixtures
Each wheel lixlure consists of three umporlanl componenls'
3; the transmitter assembly
u a scaled Dowly washer and
w a TMS wheel bolt.
m ca wly
sidewall
amen/ya
M45 whee/Doll
whee/Hm Dow/y washer
, 7 Cap
- ”summer assembly
spa/(s
wheel/“10
Semen lhrnunn wheel showing lvpical locallnn n! TMS wheel llxlun
Each wheel must be spearally machined to accepl a TMS wheel fixture. Wheels may be
supplied lined with TMS fixtures or you may have lo fit them yourself.
WAHIVING: The ball used far the rear wheel may be ola different length [hen the
bolt used for the lion! wheel—be sure to use the correct bolt. The bolts are color
coded. See the table on page 32,
13
To fit a TMS wheel lixture to a wheel:
1.
2,
3.
Remove the tire trom the wheel.
Thoroughly clean and dry the hole allocated lor the TMS wheel fixture
Choose the correct bolt tor the thickness oi the wheel rim. (See page 32.)
Place the wheel bolt into the hole in the wheel rim. The bolt head should be
on the tire cavity side at the wheel rim.
Make sure that the bolt is clean and tree oi debris, and place tour drops of
Loctrte® 242 at 90“ intervals around the bolt thread
WARNING: Use only the specially coated Dowry washers available from PI.
6,
Place the 3/8" coated Dowty washer over the antenna so that it sure on top or
the transmltter cap. Do NOT use additional washers if the bolt appears to be
too long. Check that the correct bolt has been chosen
Choose the correct transmitter tor the wheel. Each transmitter is labelled
according to its wheel position (FR. FL, HR, and RL).
Carefully guide the antenna through the wheel bolt and tighten the transmitter
onto the wheel bolt tinger»tight.
Prevent the cap from rotating using a 1/2" wrench. and tighten the wheel bolt
to 30 it lbs (40 Nm) using an accurate torque wrench titled with the modified
socket
30 fl lbs
45 Nm
torque WIE/lch . m
antenna i
iv . mom/lad soc/rel
m5 whee/ boll
wheel 11m . WIS/left
[fans/mile! assembly
wheel mm
Tluhtcnlnn a YMS wheel tixlllu
14 High F'reClSlt‘lrl Tire Monitoring System Appllcallun Note
WARNING: The antenna is exposed and can be easily damaged. The tire should
be fitted by starting at a point opposite to the position of the transmitter.
10. Send the wheel to have the tire tilled and balanced.
11. Inilate the tire using dry nitrogen and leave tor a minimum 01 six hours. This
time also allows the Loctrte” 242 to set
12. Check the tire tor leaks and deflation.
13. lino leaks are lound, ad|usl the inflation pressure to normal working pressure.
Removing and checking
TMS whe I fixtures
Wheel fixtures must be removed lrom wheels alter each race or practice.The wheel lixture
should be removed also it the transmitter eleclronics have tailed, or there are signs that
the cap is loose. or you are returning the unit to Pi Research tor repair. replacement. or
reluibishment
Always remove wheel fixtures belore cleaning the wheel with high pressure water jets or
other cleaning materials as these must not be allowed to enter the fixture through the
pressure part in the bolt head.
To remove aTMS wheel fixture from a wheel:
1. Remove the wheel lrorn the car.
2. Deilate the tire and remove the tire lrorri the wheel taking care not to damage
the TMS antenna
3. Prevent the cap from rotating using a 1/2" wrench and undo the wheel bolt.
4. Remove the transmitter assembly.
5. Clean the threads ol the wheel bolt to remove any Loctite' 242 using a clean
wire brush. Retain the wheel bolt. (Screw it into the transmitter for safe
keeping.)
6. Clean the threads ol the Transmitter assembly cap to remove any Loclite‘.
(The method is given in the Transmitter assemb/y nap e/ean/ngsection of this
Application Note.)
Discard the Dowty washer.
8. Always store TMS wheel fixtures in the protective case supplied.
?‘
ts
—_—-—__—__
Checking the cap seal
After each practice or race session you should remove the TMS wheel tixture lrom the
wheel and examine the paint spot lor signs of the cap loosening.
Il the paint spot has cracked then the cap must be removed, cleaned, resealed. and
tightened
To reseal the cap:
it Carelully remove the cap lrorn the transmitter case
2. Clean the threads of the cap and transmitter case to remove any Loctite' 242.
3. Apply lour drops of Loctite" 242 at 90° intervals around the cap thread. and
tighten the cap into the transmitter case ringer'tighl
4. Grip the base of the transmitter assembly using a wrench and tighten the cap
to 30" lbs (40 Nm) using an accurate torque wrench
5. Remove the old paint mark and apply a small spot ol paint to the joint of the
cap and transmitter case, and leave the assembly to dry lor six hours.
Cleaning the
Transmitter assembly
cap
TMS wheel fixture bolts and transmitter assembly caps are manulactured from maraging
steel, which has a mild tendency to corrode in a combination oi air and water. It is possible
that water vapour in compressed air used to inflate lites could cause corrosion oi the TMS
wheel lixture bolt and the transmitter assembly cap For this reason Pi recommend that
tires are inflated using dry air or dry nitrogen.
Cleaning the threads on the transmitter assembly cap
Use the thread cleaning tool supplied with yourTMS kit to clean TMS transmitter assembly
cap threads which are corroded or to remove Loctite“ 242. Omit steps 2 and 5 in the
lollowing list it compressed air is not available,
1. Reier to the section describing Hemov/ng and checkingTMS wheel fixtures
and remove the TMS wheel fixture from the wheel
2. Connecl a low pressure compressed air supply to the nozzle end 0! the thread
cleaning tool. Do not turn the compressed air on,
15 High Precision "lire Monitoring System Application Note
34 Hold the thread cleaning taol in a vice, With the threads on the tool pointing
upwa rds
lransm/lrer
assemal '
V 1/2" wrench
trans/miter .
assembly cap
slut
t . mead Meaning
tool
compresssdau
can/recital! pol/II "
Using "I! [Meat] cleaning loot
4. Carelully feed the antenna 01 the transmitter assembly into the hole down the
center at the thread cleaning tout. Turn the transmitter assembly so that the
threads in the cap tust catch the threads on the thread cleaning tool.
WA HNING: Use compressed air at a pressure less than 20 PSI, Follow all normal
precautions for the use of compressed all.
5, II you are using compressed air, turn it on,
St Fully screw the transmitter assembly onto the thread cleaning tool, taking care
that any debris produced falls out at the slot in the thread cleaning tool and
not into the body of the transmitter assembly,
NOTE: When fuming [he l/ansmitls/ assembly grip the Hexagonal l/als at the end, not
the body of the hansm/‘lle/ assembly. mu can use a 7/2"AF wrench on live [fans/7717191
assembly cap to turn the transmit/er assembly 00 not over-lighten the transmitter
assembly
17
Calibration and testing
Calibrating TMS
Choosing a channel to calibrate
1. Make sure that you have connected the TMS receiver to your data logging
system.
ll you are using the tour analog outputs of the TMS receiver, decide which channels you
are going to use, and plug them into the appropriate inputs of the data logging system.
2. Switch on your computer. Locale and start the Version 6 Setup application
3. Power your data logging system.
4A Plug the download lead form the computer into the download connector 0! the
data logging system.
it you are using a PiDD the red LED should illuminate to confirm that it is powered.
5. Make sure that you have the car that you want selected and choose “Calibrate
LCU Channel. " lrom the Calibrate menu.The Channel for Calibmting dialog
appears.
The current car is shown in the title bar ol the Setup main window. To quickly change cars.
hold. m and press -to F for cars 1 to 9.
if you have an MFlC or System 55m: MCU then you can calibrate MFlC channels by
choosing “Calibrate MRC Channel .,” from the Calibrate menu.
6. Choose a channel to calibrate lrom the Channel tor Calibrating dialog.The
Calibration Window appears.
—_—_________—_
is High Precision Tire Munllartng System Apollcatlun Note
Changing channel parameters
The lrrsl slap in calibralmg a channel rs lo change the channel paramelers.
M ‘f‘ ‘
MW Mn W
Lu W M Mm;
mum elm sea-q: canned mm 35401an x
um W‘— 5m 5 um fi— am [r §
Max 1000 My! 0 Max 1973—5— M» fl—— i
am [75— éflwfi W cm I?" was 97 ‘
,. ,, , l
mum-em ammaxam — —
m, was Mn 0 MA! 5555 no n
. nmn‘mIsm» DMDED‘WSMIW < - 7
11mm 5mm I? ”Fr—- Ema-m IfT ‘
w T camel
Changing channel paramelers lnr RS-AZZ TMS pressure channels
To change channel parameters:
14 Make sure lhal lhe Calibration window is open.
2. Choose “Change Channel Paramelers v “ lrorn lhe Calibrale menu, The
Channel Parameter Editor dlalog appears
3. Select Name and enter a name lor the channel As you enter me channel
name the Tag name changes.
19
The lollowtng table gives details about TMS pressure channels.
Index Default channel name Function
SSO TMS O\SJB 0 FL pressure
591 TMS l\SJB 1 FR pressure
552 TMS 2\SJB 2 RL pressure
853 TMS ms“?! 3 RR pressure
44 Select Units and enter PSI.
Set the Precision to one decimal place,
6. Define the measurement range 01 the sensor by entering a maximum oi
95.5 and a minimum ol 0 (zero) tor the calibrated channel settings.
9"
NOTE: Heme/noel 1/73! 955 PSI is the talus m‘splayed during a lau/I condition or during
learn mode. The inf/anon pressure measu/emenl range is 07635 PS/.
7. Select Group and enter a group number.
As you calibrate TMS pressure channels give them the same group number.
8. Set the Maximum Raw channel selling to 65535 and the Minimum Flaw
channel Selling to 0 (zero).
Entering calibration points
When you calibrate a sensor channel you define a set of points by specitying x- and
yrcoordinates. A minimum of two points are required to create a calibration curve. Ideally
the calibration should include points close to the maximum and minimum raw values.
Calibration Information for RS-422 TMS pressure channels
RS-422 TMS pressure channels require the lollowing channel calibration.
Pressure y-coordinate W x-coordinate Function
0 PSI 0 16384 counts minimum pressure reading
95.5 PSI 95.5 65535 counts tault condition or learn mode
zn Hiqh Plettstcn we Monitoring System Application Note
To enter x- and y-coordinates using the keyboard:
1. Make sure that a Calibration window is open.
2. Ensure that “Manual ADC Count" IS checked (J) in the Calibrate menu.
3. Choose the ins button or press- in the Coordinate Entry dialog, enter the
y-coordlnate tor 0 PSI lrorn the table above.
The Coordinate Entry dialog box reappears requesting an x-coordinale.
4. Enter the x-coordinate for 0 PSI lrcm the table above.
5. Choose the Ins button or press [@. in the Coordinate Entry dialog. enterthe
y-coordinate for 955 PSI from the table above.
6. Enter the x-coordinale for 95 5 PSI from the table above.
To delete a calibration pornt. highlight it in the Calibration points list, and choose the Del
button or press
Calibration information tor TMS analog voltage channels
ll you are using the Tire Monitoring System with a non-Pi System and the tour analogue
output voltages. then use the lollowing inlormation when calibrating your system.
DAC output voltage Pressure Function
125V 0 PSI minimum pressure reading
3.75V 63.5 PSl maximum pressure reading
SV 95 5 PSI lault condition or learn mode
Calibration curves
The calibration tool is supplied with live calibration curves that can be titted to your
calibration points to deline the response of the sensor over the entire measurement range.
The TMS pressure channels requires an ax+b calibration.
To fit a calibration curve:
it Select “Calibration Type" lrom the Calibrate menu and choose ax+b,
2 Choose the Fit button The calibration curve is tilted to the calibration points
in the calibration graph.
21
—-———————_—
ZZ
n mm."
qua M
aw
Sm
gm 74-
“3'500 f
§wu
rim —
m ,
was —--
an F—* -
a mum: 20mm 30000 10000 scum) wumsm
cmhmiun : nx ; b
r Negullgt Szns:
Calibration wlmlnw lor a TMS pressure channel
To save a calibration:
1A Choose “Close" From me control-menu box
2. Choose Yes to save the calibranon and relurn to the Setup application,
Choose No w return to Setup applicauon and make no changes [0 the
calibration.
ngn Pleusmn Tue Monimrlnu System Application NDIE
SIS-422 debug channels
The serial data stream from the TMS receiver includes four debug channels that can be
used to test the operation of the Tire Monitoring System The lollowing table gives details
about TMS debug channels.
Index
SST
SS4
585
SSS
$57
Detault channel name Function Calibration
SJB Temp temperature no calibration
TMS 4\SJB 4 FL debug no calibration
TMS 5\SJB 5 FR debug no calibration
TMS 6\SJE 6 RL debug no calibration
TMS 7\SJB 7 HR debug no calibration
The B-blt temperature message contains temperature data for all tour wheel fixturest
Bil Wheel fixture
7. 6 Front Lett
5, 4 Front Right
3, 2 Rear Lelt
l. 0 Rear Flight
Label color
red
blue
yellow
white
NOTE The temperature measured is the tempera/we ol the transmitter e/ectrom‘cs, not
[he temperature of the fire.
Temperature ranges are indicated by the tollowing bit states
Bil state
Temperature range
less than 104°F (40°C)
106°F to 167°F (41°C to 75°C)
169°F to 230°F (76 to 110°C)
greater than 230°F(110°C)
23
Testing TMS
transm Hers
To test a transmitter titted to a wheel not titted to a car:
1. Make sure that the TMS receiver is connected and functioning correctly.
2. Power your data logging system
3. Plug the download lead lrorn the computer into the download connector 0! the
data logging system
4. Make sure that you have established a communication connection using the
Sewer application.
If you are using the PiDD the red LED should illuminate to confirm that it is powered
5. Make sure that the Server and Setup are connected to the car.
The current car is shown in the title bar ol the Setup main window. To quickly change cars.
hold (Clrl) + (Shiit) and press (F1) to (F9) tor cars 1 to 9,
Gt Choose “Watch LOU. channels lrom the Connect menu, The Channels tor
Watching dialog appears.
7. Select your TMS channels,
8. Select the Calibrated option to display channel values in calibrated units.
The channels appear in a Watch Calibrated Channels window,
mauwimm;:,ii,
Watching non~leavnod TMS channels
__——__._______
24 High Preclston Tiie Monitoring System Applicatmu Note
9. Place a protective max on the floor.
10. Rolale lhe wheel unlil Ihe wheel llxlure is close Io Ihe lloor
11, Raise the wheel 6" (150mm) keeping the sides at right angles lo the floor.
12. Release the wheel and bounce it on the prolecuve mar lor 20—30 seconds.
The channel values should read 95.5 F'Sl for 2 seconds, and lhen relurn lo a reading of
80 PSI
wheel lulu/e
5'17517mm}
Bnnncinn a when! In Iesl transmitter nperalinn
To test a wheel transmitter fitted to the car:
1. Ralse the car oil the ground and spin the wheel [or 20—30 seconds,
The channel values should read 95.5 PSI lor 2 seconds and then relurn to a reading of
80 PSI.
TMS channel In learn made
25
_————-_—____
Using the Tire Monitoring System
Pre-race and ore-testing
The Tire Monitoring System is a safety clevlce and therefore should be titted and treated
with care. The envrronment in which it is designed to work is harsh and it is important that
the system is checked frequently. In particular:
\. Crack test the TMS wheel bolts belore high speed races such as super
speedways
‘J Alter each race or practice session. remove all transmitters from their
wheels and discard the Dowty washers.
Send wheels. TMS wheel bolts and transmitter assembly cases tor crack
testing once or twice each season
»-' Balance wheels alter fitting TMS wheel lixtures.
.: Inllate the tires uslng dry nitrogen and leave tor a minimum oi two hours.
Check the tires tor leaks. It no leaks are found. adjust the inflation pressure
to normal working pressure,
9? Test the operation of each transmitter before filling the wheel to the car.
Before fining transmitters
‘ Clean all threads to remove debris
a Renew the coated Dowty washer,
39 Use wheel bolts oi the correct length,
vii Apply the Loctite" 242 at 90° inteh/als around the thread oi the wheel bolt.
Race operation
Single cal teams
The TMS receiver is designed to learn about the transmilters from which it is receiving
data, With learn mode enabled the receiver takes up to 60 seconds alter motion is
detected to identity the TMS transmitters and output valid inflation pressure data.
It you are a single car team, then you can request that the learn mode is disabled so that
valid intlation pressure data is available as soon as motion is detected. Learn mode can
be disabled by a request to Pi Research Customer Support.
—-—-—————.————_—
26 High Preclslbn Tire Manitotlng System Appllcallon Nate
Mum-car teams
If you have more than one car litled With the Tire Monitoring System then the learn mode
enables the receiver to learn about the transmitters fitted to its car without interference
lrom other cars in the same team
Identilying non-learned or failed transmitters
If your Tire Monitoring System is sending data to the logging system using the FtS-422
communication link then a n0n~learned or tailed transmitter can be identified by an
inllalion pressure of 80 PSI,
ll your Tire Monitoring System is connected to tour analogue input channels then a non-
Iearned or tailed transmitter can be identified by an inllation pressure 0! —32 PSI (0 volts).
Message overlap
There are times when more than one transmitter is transmitting pressure data at the same
instant. The TMS receiver is designed to tolerate some overlap of messages. Messages
that completely overlap each other are lost The receiver maintains the last good pressure
reading until a complete new message is received
Running with a tailed transmitter
The transmitter is designed as an integral part ol the wheel system and is subject to the
inllation pressure. Ila wheel transmitter tails electronically. use of the wheel may continue
until the opportunity arises to change the wheel for one With a lunctioning TMS transmitter.
Running with the wrong wheel tixture titted
If you lit a TMS wheel fixture in the wrong position, e 9 you lit the Rear Left (RL) wheel
lixture on the rear Ieil wheel, you Will still get valid inflation pressure data, but Version 6
will label the channels incorrectly.
27
Sudden loss of inflation pressure
The TMS receiver rs set so that H the inflation pressure changes by more than 15 PSI the
reCeIVet double-checks the value by waiting 1 25 seconds tor the next pressure reading
belore sending pressure data to the logging system.
This teature can be disabled by a request to Pr Customer Support
Wheel fixture temperature
The transmltter electronics in each TMS wheel lixture have an operating temperature
range oi between +40°F and +248°F (+10°C and +120°C). Operation outside this range
can result in reduced battery lile and/or transmitter failure
Teams engaged in types at racing where wheel temperatures may exceed the upper limit,
(such as road circuits) must accept that transmitters could latl. and should make
appropriate provision lor spare/replacement wheel ltxluresv
2: High Precision Tue Monllorlng System Applicant"! Note
Specifications
TMS transmitter
Description
Operating vollage
Vollage source
Ballery hie
Pressure measurement range
Resolution
Accuracy
Maximum overpressure
Transmission lrequency
Transmission range
Temperature range (operating)
(storage)
Weight
Value
6 volls DC nominal
Lilhium batteries
50 hours (operating)
9 months (storage)
0—635 PSl
0.125 PSI
t1% FSO @ 77~257°F (254125°C)
120 PSIA
355MHZ
100 leel (25m) maximum
+40°F to +248°F (140°C to ‘120°C)
41°F lo +266°F (v20°C to +130°C )
3 ounces (85 grams)
29
“fl
TMS receiver
Description Value
Operating voltage range 10—1 BV DC
Operating current lOmA
Resolulion and accuracy determined by transmitter
Analogue voltage output 0 75V
Output impedance 470 ohms
Communication interface
Operating temperature range
Weight
balanced RS-422, 9600 baud
+501: Io +140°F(+10°C|0 +60°C)
5 1 ounces (145 grams)
Environmental IP65
Receiver connector types
Description Connector Mating connector
System connector A3210-35PN ASG10-358N
Antenna TNC TNC
Receiver connector pin details
Pin Description Pin Description 7
1 Power UV 8 FL sugnal oesv (not slandard Pi installation)
2 Power 9—18V DC 9 FR signal 0~5V (not standard Pi installation)
3 TMS to Pi System (A)' 10 RL signal O-SV (not standard Pi Installation)
4 TMS to Pi System (B)‘ ll 9600/38400 baud select (not used)
5 Signal OV 12 Tick in (not used)
6 Pi System to TMS (A)' 13 RR signal 0—5V (not standard Pi installation)
Pi System to TMS (B)'
'According to ElA RS~422 specifications
—————
an ngh Preclsian Tire Monitoring System Application Note
“fi—
Dimensions
TMS wheel fixture
whee/ 00/1
ems/ma Luau/F HEX cap Hansmlllel Ease
03/5'
Dow/y washer o 93'A/FHEX
TMMMF m . | A H . 4 parnl spa] . . s
‘ 1700/4307 > < 72912907 ’
Dimensinns in mlllimelres and inches
31
“—
TMS wheel bolts
TMS wheel bolts are avallable m (we Ienglhs. whlch are shown in the next table,
Dimension us the thickness 01 me wheel maternal, Dimensions are shown in millimetres
and inches.
”Heads/07 Eva/EGDOW/
24 UNFJA wheel was/lei
\ F I4
l l ‘
4 X» r ' [
u y , U,
Part Number x y z 1 Color
103050367 13.84(04545‘) 22.35(0.580') 9 59(O.374”) 10 16 t0.5(0.4" t 002") Black
103-050369 113001445”) 19.81(0.780") 9.59(O 374") 7 62 to 5013" i 0.02") Green
TMS receiver
M25/olb‘mm (02‘)
\ ff: .
g 3 l
3; a j
v ‘ h , '
25/017> ‘ _3ov0112'/_
‘ 45.0110? ,
‘ 514/157 ,
‘ 92.0067 y
_ row/4.27 y
Dimenslnns In mllllmelres and mches
————-—-——_——____.
32 Hrgn Premsmn Tlre Monllnnnq System Appllcallon Note
————__
Parts numbering
HP TMS kit 1 (Part
numb SOB-050381)
Description Part number Quantity
HP TMS wheel fixture (RR) 01B~050391-HR 3
HP TMS whee} fixture (RL) 018-050391-RL 3
HP TMS wheel lixlure (FL) 01B-050391-FL 3
HP TMS wheel fixture (FR) 018-050391-FH 3
HP TMS receiver 01 8-050210 1
TMS long boll‘ 105050357 12
or TMS short boll' 109-050369 I2
TMS case and accessones 133050395 1
' Selected at “me of order
33
“—
HP TMS kit 2 (Par!
number 3084350382)
Description Part number Ouantlty
HP TMS wheel fixture (RR) O1B-O50391ARR 6
HP TMS wheel fixture (RL) 01B-050391-F1L 5
HP TMS wheel fixture (FL) 018-0503914FL 6
HP TMS wheel fixture (FR) 01B»050391-FR 6
HP TMS receiver 013050393 1
TMS long boll” 108-050367 24
or TMS short bolt' 108050369 24
TMS case and accessories 135-050395 1
' Selected at time 0! order.
HP TMS receiver kit
(Part number
3034350383)
Description Part Number du;ntity
HP TMS receiver 01 B-05021 0 1
Car antenna 01A-049085 1
HP TMS Application Note 298-071223 1
Antenna extension loom Gal-00509 1
Antenna mounting kit SOC-049087 1
h.—
34 High Prectsmn Tire Monitoring System Application Note
HP TMS case and
accessories (Part
number 1 33-050395)
Description Part Number Quantity
Car antenna 01A»049085 1
Antenna extension loom OBI-00509 1
TMS custom socket WEI-050256 1
TMS thread cleaning tool 108-050297 1
TMS sealing ring 108-050389 50
HP TMS Application Note 298-071223 1
Antenna mounting kit 300049087 1
Loclile' 242 thread lock 323-0023 1
HP TMS Application Note 298-071223 1
Refurbishment and
repair data
Faulty Tire Monitoring System equipment should be returned to Pi Research. Damaged
TMS receivers will be repaired or replaced. Damaged TMS wheel fixtures will be replaced,
Repair and replacement costs lor Tire monitoring System equipment are subject to
examination of the equipment by P1 Research.
Tire Monitoring System equipment should be returned to Pi Research for refurbishment
at the end at each race season,
35
_————“
Contact information
For more information about Pi products and details of worldwide authorised agents,
please Contact,
Pi Research lelted
Brooklield Motorsports Centre
Twentypence Road
Cottenham
CAMBRIDGE
UK Customer Support Tel +44 (0) 1954 253600
034 BPS Fax +44 (0) 1954 253601
Pi Research, Inst
8250 Haverstick
Suite 3275
Indianapolis
IN 46240 Tel +1 (317) 259-8900
USA Fax +1 (317) 259-0137
Part Number: 298-071223-2A
Issue 210 March 1999
Pi and the Pi logo are trademarks of Pi Group Limited
© Pi Research Limited, 1999
www. pi»groupicom
———_—.—_..—__
35 High Precision Tire Monitoring System Application Note

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