bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 bf1systems IRTPTMS V3 System Description 1_01 Page 1 of 15 1 Modifications Date Modifications Author Version Modified Sheets 04/11/2013 Document creation SG 1_01 All By GMS Approved Date 05/11/2013 Signed GMS If this document has been printed then it cannot be guaranteed that it is the most recent version. Please refer to the document directory for the latest release. The information in this document is the property of bf1systems and may not be copied, communicated to a third party or used for any purpose other than for which it is supplied without the express written permission of bf1systems. RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 2 of 15 7 5 4.1 5.1 5.2 2 Table of Contents 1 Modifications ......................................................................................................................................................................... 1 Table of Contents .................................................................................................................................................................. 2 2 3 Table of Figures ..................................................................................................................................................................... 3 Conformity to FCC-Rules ....................................................................................................................................................... 4 4 United States of America .............................................................................................................................................. 4 Statement FCC 15.19: Labelling requirements .................................................................................................... 4 4.1.1 4.1.2 Statement FCC 15.21: Information to the user ................................................................................................... 4 System and Functional Description ...................................................................................................................................... 5 System Description ....................................................................................................................................................... 5 Functional Description .................................................................................................................................................. 6 6 Warning Algorithm ................................................................................................................................................................ 6 6.1 Warning Limit Minimum pressure ............................................................................................................................ 6 6.2 Warning Limit Nominal pressure minus relative deviation (Nominal Pressure 25%) ......................................... 6 System Components ............................................................................................................................................................. 7 7.1 Motorsport DigiTyre ECU (MDE) .................................................................................................................................. 7 Installation Area .................................................................................................................................................... 7 7.1.1 Temperature Range .............................................................................................................................................. 7 7.1.2 Voltage Range ........................................................................................................................................................ 7 7.1.3 7.1.4 Current Consumption ........................................................................................................................................... 7 7.1.5 MDE Pin Description ............................................................................................................................................. 7 7.1.6 CAN Bus Connection ............................................................................................................................................. 8 7.2 Wheel Electronics .......................................................................................................................................................... 8 Installation Area .................................................................................................................................................... 8 7.2.1 Versions ................................................................................................................................................................. 8 7.2.2 Temperature .......................................................................................................................................................... 8 7.2.3 Pressure ................................................................................................................................................................. 9 7.2.4 7.2.5 Environmental Requirements .............................................................................................................................. 9 7.2.6 Mechanical specification ...................................................................................................................................... 9 7.2.7 Measurement specification .................................................................................................................................. 9 Byte format ......................................................................................................................................................... 10 7.2.8 7.2.9 Specification for HF transmitter ........................................................................................................................ 10 7.2.9.1 Frequency ....................................................................................................................................................... 10 7.2.10 Transmission ....................................................................................................................................................... 11 7.2.11 Block diagram wheel electronics ....................................................................................................................... 11 Digital antenna ........................................................................................................................................................... 11 7.3.1 Installation area .................................................................................................................................................. 11 7.3.2 General dimensions and values ......................................................................................................................... 11 7.3.3 Temperature ranges .......................................................................................................................................... 11 7.3.4 Voltage supply .................................................................................................................................................... 11 7.3.5 Current consumption ......................................................................................................................................... 11 7.3.6 Environmental conditions .................................................................................................................................. 12 7.3.7 LIN communication with MDE/Combined Antenna ECU control unit ............................................................ 12 7.3.8 Connection occupancy, sleeve strip .................................................................................................................. 12 7.3.9 Block diagram ..................................................................................................................................................... 12 7.3.10 Assembly ............................................................................................................................................................. 12 Trigger transmitters ................................................................................................................................................... 13 Temperature ....................................................................................................................................................... 13 7.4.1 7.4.2 Mechanical requirements .................................................................................................................................. 13 Voltage range ..................................................................................................................................................... 13 7.4.3 7.4.4 Current consumption ......................................................................................................................................... 13 RD096 110124 7.4 7.3 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 3 of 15 Frequency ........................................................................................................................................................... 14 7.4.5 7.4.6 Modulation ......................................................................................................................................................... 14 Physical link ......................................................................................................................................................... 14 7.4.7 Protocol ............................................................................................................................................................... 14 7.4.8 7.4.9 Diagnostics .......................................................................................................................................................... 14 7.4.10 Connector ........................................................................................................................................................... 14 Environmental qualification .............................................................................................................................. 14 7.4.11 7.4.12 Schematic representation of the trigger transmitters ..................................................................................... 14 3 Table of Figures Figure 2: Wheel electronics block diagram .............................................................................................................................. 11 Figure 3: Antenna pinout ........................................................................................................................................................... 12 Figure 4: RF Antenna structure ................................................................................................................................................. 12 Figure 5: RF Antenna dimentions .............................................................................................................................................. 13 Figure 6: LF Satellite Trigger ....................................................................................................................................................... 15 RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 4 of 15 4 Conformity to FCC-Rules Electronic wheel sensors within the IRTPTMS system contains Transmitter Module FCC ID: xxx-xxxxxxxxx 4.1 United States of America 4.1.1 Statement FCC 15.19: Labelling requirements This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1)
(2) This device may not cause harmful interference, and This device must accept any interference received, including interference that may cause undesired operation. 4.1.2 Statement FCC 15.21: Information to the user The user manual or instruction manual for an intentional or unintentional radiator shall caution the user that changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate the equipment. RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 5 of 15 5 System and Functional Description 5.1 System Description The Infrared Tyre Pressure & Temperature Monitoring System (IRTPTMS) monitors vehicle tyre pressures and temperatures. A typical system is comprised of the following components:
1 Motorsport DigiTyre ECU (MDE) Up to 4 wheel electronics including mounting system Up to 4 digital antennas Up to 4 trigger transmitters The wheel electronic mounted on the wheel rim measures tyre pressure ambient temperature and tyre carcass temperature at regular intervals and transfers the values wirelessly to the reception antenna(s). The current pressure and temperature values can be requested specifically via the LF trigger function. In the digital antenna, the radio data telegram is decoded and transferred to the ECU unit as a digital signal. The ECU unit evaluates the received data and forwards the information as required. RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 6 of 15 5.2 Functional Description The wheel electronic is mounted on the wheel rim and measures tyre pressure, temperature and wheel electronic status. The measured data is sent from the wheel via a transmit stage in the wheel electronics. A system with relatively seldom-measured data transfer is adequate for tyre pressure monitoring, provided it features the additional option of detecting sudden pressure loss. This enables the electronics in the wheel to be designed for minimal power draw and thus maximize battery life. All wheel electronics have a unique ID code that is forwarded along with data at each transfer. The HF transfer occurs in the 433MHz range, referred to as the ISM range. The trigger functionality is achieved by the use of a 125 kHz LF channel. The control unit calls up the wheel electronics via the trigger transmitters when power is supplied to the MDE. When a pressure loss > 0.2 bar on the previously measured pressure value is detected, the wheel electronics switch immediately to fast-transmit mode. In this situation, the wheel electronics measure and transmit every 0.8 seconds. The IRTPTMS measures and transfers considerably more data than is necessary to ensure reliable basic function. It can therefore use a data transfer path this is not assigned for the error-free transfer of each individual data protocol. Using the trigger function, an implausible and/or non-received data message can be requested again from the corresponding wheel electronics. The data sent by the wheel electronics is received via the digital antenna and is subsequently decoded. The decoded data is transferred onwards to the MDE unit via a digital interface (LIN interface). The MDE unit evaluates the received data and forwards the information to the driver information system as required. This provides the driver with information on the necessary tyre pressure or temperature. The main functional characteristics of the control unit are:
A central warning algorithm and an algorithm for the wheel manager. The vehicle-specific connection for the power supply system and manufacturer-specific operation and display philosophy. 6 Warning Algorithm The system monitors a nominal pressure, which is set automatically when the tyre speed exceeds 30kph, and a fixed set minimum warning pressure. The higher value in each case is used to generate the deflation warning. 6.1 Warning Limit Minimum pressure At this warning limit, a check is made against the minimum warning pressure AbsPressure Minimum, which is programmed into the system as a fixed value. The corresponding warning bit is set, if the measured pressure lies below this threshold twice in succession. 6.2 Warning Limit Nominal pressure minus relative deviation (Nominal Pressure 25%) This warning limit is calculated from the nominal pressure less a relative deviation of 25% of the nominal pressure. The nominal pressure is specified by the driver. An accuracy reserve of 0.1 Bar is added to the warning limit. The corresponding warning bit is set if the measured pressure lies below this threshold twice in succession. RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 7 System Components The system components of the IRTPTMS are described in the following sections. 7.1 Motorsport DigiTyre ECU (MDE) 1_01 Page 7 of 15 The MDE control unit consists of a printed circuit board with a microcontroller and interfaces for CAN, RS232 and TPMS-
LIN. The tyre information received from the digital antennae is recorded and evaluated in the control unit. The pressure information and, if applicable, the warning information, is forwarded via the CAN bus to the display systems in the vehicle. The information from the digital antennae is transferred to the control unit via a LIN bus communication link. The control unit is the master here, while the antennae and/or the trigger transmitters work as slaves. The control unit interrogates the digital antennae at set intervals with respect to radio messages. The trigger transmitters are contacted in sequence. The control unit also provides the supply voltage to the trigger transmitters and the antennae. The most important details of the control unit are described below. 7.1.1 Installation Area The control unit is intended to be installed in the interior of the vehicle. If not stated otherwise, the values stated in the following chapters relate to a temperature of 25C and to the current sample control units based on the HCS12 processor. 7.1.2 Temperature Range Operating temperature:
Storage temperature:
7.1.3 Voltage Range Nominal voltage:
Operating voltage:
Maximum voltage:
Under voltage switch off:
No. of Antennas / triggers that can be supplied:
7.1.4 Current Consumption Normal operation:
7.1.5 MDE Pin Description 12V 9V to 16V 0 to +18V, with polar protection The control unit is switched off when Vbatt < 7.5V 6
< 200 mA @ 12V (without antennae or trigger)
-40C to +80C
-40C to +85C System Connection (8STA2-10-35PN, Male, Circular) Pin 1 2 3 4 5 6 7 Description Protected Ignition, +12 V GND, LIN GND, RS232 GND LIN V RL TRIGGER Switched LINV TRIG FR/RR ANT FRT/REAR LIN V FL TRIGGER Switched LIN DATA FR TRIGGER CAN H (DASH), RED Pin 8 9 10 11 12 13 Description CAN L (DASH), BLUE RS232 DATA TX / Configure Input A RS232 DATA RX / Configure Input B LIN DATA RL TRIG/FRT ANT LIN DATA FL TRIG/REAR ANT LIN DATA RR TRIGGER RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 8 of 15 Secondary Connection (8STA2-10-35SA, Female, Circular) Pin 1 2 3 4 5 6 7 Description Configure Input C Configure Input A / RS232 DATA TX Configure Input B / RS232 DATA RX Daughterboard Out 2 GND Sense RS232 GND N/C Pin 8 9 10 11 12 13 Description N/C N/C N/C N/C N/C N/C 7.1.6 CAN Bus Connection Vehicle bus:
TPMS bus messages:
Start-up behaviour:
CAN interface data:
Driver module:
CAN H / CAN L line:
High speed CAN, transfer rate 1Mbits/sec Programmable to customer requirements Power applied to the MDE TJA1050T Resistant to short circuits against GND and +Vbatt 7.2 Wheel Electronics The wheel electronics measure the pressure, the air temperature inside the tyre, plus the tyre carcass temperature and transmit this data via a HF radio route, together with its residual battery life and ID code to the digital antenna. 7.2.1 Installation Area The wheel electronics are mounted on the inside of the wheel rim. During assembly, the bf1systems assembly guidelines must be noted. 7.2.2 Versions The working frequency of 433MHz is used exclusively. 7.2.3 Temperature Working temperature Storage temperature > 50C max. 30 days Storage temperature (6 months) Temperature gradient in the working temperature range RD096 110124 Max
+125
+70
+50
+16 Units C C C K/s Min 0
+50 0
-16 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 9 of 15 7.2.4 Pressure Pressure overload Measurement range 7.2.5 Environmental Requirements Vibration with overlying temperature Temperature profile Vibration profile 1 Acceleration Static acceleration (vertical to PCB) Evaluation criteria 7.2.6 Mechanical specification Dimension Wheel Sensor Assembly Weight 7.2.7 Measurement specification Pressure Measurement range Accuracy Resolution Comment Nominal 0C to +50C LSB Sensor Pressure Temperature Measurement range Accuracy Resolution Comment
0C to +50C LSB IR Sensor Temperature Measurement range Accuracy Resolution Comment
LSB Maximum 2000 kPa 50 kPa to 732.5 kPa 0C to 125C 20Hz to 2000Hz: 2 g2/Hz to 0.035 g2/Hz 12 x half sine shock pulses of 80g pk acceleration, pulse width 6ms No malfunction during and after the test 70.1mm x 33.4 x 26.8mm 45g 1g Min 0.882
-29.4
Min
-40
-1
Min
-2
-0.5
Nom
14.7 Nom
1 Nom
0.125 Units Max 4.631 bar
+29.4 mbar mbar
Max Units 215
+1
Max 125 0.5
C C C Units C C C RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 Tyre Carcass Surface Temperature (17.5 & 45 Field of view) Measurement Range Resolution Comment
10-bit Ambient temp of 0 - 50C and target temp of 0 - 60C Ambient temp of 0 - 50C and target temp of 61 180C Ambient temp of 0 - 50C and target temp of 181 215C Ambient temp of 0 - 100C and target temp of 0 120C Ambient temp of 0 - 125C and target temp of 0 180C Ambient temp of 0 - 125C and target temp of 181 - 215C Min
-40
Nom
0.25 0.5 2 3 1 2 3 Accuracy
(Under conditions) isothermal 1_01 Page 10 of 15 Max 215
Units C C C C C C C C Acceleration Comment Min Nom Max Units threshold Recognition for turning wheel
(RS == 1)
-40C to +90C
> 90C Recognition threshold for resting wheel (RS == 0)
-40C to +90C
> 90C 2 2 1 1 11 14 10 13 20 26 19 25 g g g g 7.2.8 Byte format Start bit Data bits Stop bit Code specification Description Data format Transmission rate None 8, MSB first None Conditioned diphase code flank at the start of a bit interval no flank in the middle of a "1" interval Binary 9.6 kbps +/- 10%
flank in the middle of a "0" interval 7.2.9 Specification for HF transmitter 7.2.9.1 Frequency 433 MHz Version Modulation Frequency fnom @ 25C Frequency drift overall (aging, temperature) Logic levels Data = 0 Data = 1 Frequency shift keying (2-FSK) 433.920 MHz 35 kHz fnom 85 kHz fnom - f/2 fnom + f/2 RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 11 of 15 433 MHz Version 7.2.10 Transmission Marking for type approval Tolerance transmitted power Tolerance transmitted power over lifetime Tolerance temperature range transmitted power over working
+/- 3 dB @ 25C
- 3 dB
- 5 dB 7.2.11 Block diagram wheel electronics Figure 1: Wheel electronics block diagram 7.3 Digital antenna See Chapter on Assembly 550kHz @ -85dBm / 20C FSK, hard keyed
>5nT <8nT The digital antenna has integrated signal conditioning (decoding processor) to receive and decode the HF signal sent by the wheel electronics. The conditioned information is transferred to the MDE control unit via a LIN communication. 7.3.1 Installation area The digital antennae are mounted on the outside of the vehicle. The area directly subject to being hit by stones from the road must be avoided. The antennae should therefore be installed in a protected position behind a plastic trim (wheel housing shell, or similar). 7.3.2 General dimensions and values Dimensions:
Frequency range of the receiver:
Type of modulations:
Sensitivity within bandwidth @ 25C Reduction of Sensitivity over frequency max. 1nT max. 1nT Reduction of Sensitivity over temp 5 dB +/-1dB Reception to wake-up:
RSSI signal:
Start of climb typically 16dBV @ 25C Saturation typically 56dBV @ 25C 9.6kBaud +/- 10%
Radio data rate:
Radio reception frequency:
433.92 MHz +/-200kHz 7.3.3 Temperature ranges Operating temperature:
Storage temperature:
7.3.4 Voltage supply Supply line:
for each digital antenna Supply voltage: > (Vbatt 2V) Switch type:
High side switch 7.3.5 Current consumption Supply current, digital antenna:
At HF reception < 30mA permanently 0C to + 125C 0C to + 70C Two wire circuit, Vbatt, GND RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 12 of 15 in line with test according to DIN 50021-SS 144h Climate membrane 2 mm 7.3.6 Environmental conditions Protection class: IP 69K in line with test according to DIN 40050 Salt spray:
Pressure balance:
7.3.7 LIN communication with MDE/Combined Antenna ECU control unit The LIN communication of the antennas with the MDE/Combined Antenna ECU control unit fulfils the specification of the LIN Consortium Version 1.1. The MDE control unit is in master operation here, while the antennas are in the slave condition. The following details apply:
LIN bit rate:
LIN driver:
Bus coupling:
Signal reference:
7.3.8 Connection occupancy, sleeve strip Manufacturer:
Type, plug connector:
Contact system:
Version:
Number, contact pins:
Pin version:
Sealing system:
Distance between pins (Pitch):
Tyco electronics AMP GmbH MQS in line with Tyco drawing 114-18063-014 Micro-Quad-Lock Pin shell 4 Pins Sealed, gold-plated
(sealed; selectively gold-plated), Primary sealing: Lamellar sealing in the housing Secondary sealing: Individual seam sealing 2.54x2.54mm 10k Baud +/-2%
Infineon TLE 6259-2G EMC network Ground Pin:
1 2 3 4 Signal:
LIN_GND LIN_V1 LIN_DATA Description:
LIN Ground LIN Supply voltage LIN Data SCREEN_GND Ground for Screen Connection (optional) Figure 2: Antenna pinout 7.3.9 Block diagram The basic electrical structure of the antenna electronics is outlined below. Figure 3: RF Antenna structure 7.3.10 Assembly The digital antenna can be mounted in the vehicle in line with the following sketch. RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 13 of 15 Figure 4: RF Antenna dimentions 7.4 Trigger transmitters 7.4.1 Temperature Operating temperature Storage temperature 7.4.2 Mechanical requirements Dimensions 4 vibration loading capacity Shock loading capacity Free fall Plug push thru strength Soundness Pressure balance 7.4.3 Voltage range Static voltage strength Dynamic voltage strength ESD strength Operating voltage 7.4.4 Current consumption Passive operating current Active operating current (transmitting) RD096 110124
-40C to +105C
-40C to + 90C 90.5mm x 65.0mm x 27mm 3533 41 202 001 C 3533 41 202 001 C 1000 mm falling height, concrete (EN 60068-2-32)
> 55N IP 69K Climate membrane 2 mm
+20V / -2.8V limited by control unit Interference pulses Type 3a, 3b via coupling clamp 8 kV (human body model)
+7.0V to +18V
< 10 mA @ 12V
< 230 mA @ 12V bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 14 of 15 Ground current
< 230 mA @ 12V 7.4.5 Frequency Frequency Field strength Duration of transmission Keying ratio Field orientation 7.4.6 Modulation Modulation Baud rate Report 7.4.7 Physical link Data interface 7.4.8 Protocol Data report 125 kHz +/-5 kHz @ -40C to +105C
(In condition installed in vehicle)
< 21 dBV/m @ 3m, 16V
< 10 s
< 0.1 Field of a magnetic dipole, symmetrical axis transverse to the housing Duration of impulse
< 0.5 kBaud See specification for the corresponding WE LIN specification Rev. 1.1 LIN specification Rev. 1.1 LIN_SPDPS.doc LIN_Master.doc LIN_Slave.doc 7.4.9 Diagnostics Current monitor in the antenna circuit Diagnostics response 7.4.10 Connector Type Pin 1 Pin 2 Pin 3 Pin 4 7.4.11 Environmental qualification VM > 0.5 V (in the transmission impulse) Set diagnostics status (see LIN_Slave.doc) Mini-timer, 4-pole LIN_GND LIN_V1 (Voltage supply) LIN_DATA SCREEN_GND 3533 41 202 001 C 7.4.12 Schematic representation of the trigger transmitters RD096 110124 bf1systems IRTPTMS V3 System Description bf1systems IRTPTMS V3 System Description V1_01 1_01 Page 15 of 15 Figure 5: LF Satellite Trigger RD096 110124