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The Technology
The
Brightwater tyre monitoring system consists of wheel mounted sensor/transmitters
that continually monitor pressure and temperature. Each sensor transmits
a low power radio signal with coded sensor data to the on board receiver.
The interval between each sensors' transmission is variable to conserve
sensor battery power, a higher rate when the pressure fluctuates or the
tyre is hot, slower when the pressure is stable. Typically intervals are
between 0.5 sec (2 Hz) and 30 secs, although intervals down to 0.05 sec.
(20Hz) can be used.
The on-board receiver sends data to the vehicles system by RS232 or CAN
bus. Optionally internal data logging can be specified or a remote driver
display may be used for direct readout of data.
| Typical Example - Motorsport System specification. | |
| Sensor specification | |
Measuring
range |
Pressure 0..2.5bar (0..36psi) Resolution 13mbar (0.18psi) |
|
Pressure
accuracy |
each sensor is calibrated to a traceable standard and will be typically within 2 bits over the full range |
Sensor
Temperature |
0..125degC - resolution 1degC |
|
TX
update rate |
0.5
sec high, 30 sec low pressure and temperature dependant |
Operating
temperature range (transmitter) |
0..125degC |
|
Survival
temperature range (transmitter) |
-40..150degC |
Operating
frequency |
433.92 MHz |
|
Emission
category |
MPT1340, ETS 300-220 |
Effective
radiated power |
-6dBm (0.25mW into 50Ω) |
|
Typical
TX range |
30m (free space) |
Antenna |
1/4wave whip (170mm) |
|
Housing |
Titanium
through rim mounted 27mm dia. x 18mm high, weight 30gms |
| Receiver specification | |
Operating
frequency |
433.92 MHz - single 1/4 wave antenna |
|
Power
supply |
8..15V - 40mA |
Operating
temperature range |
0..65degC |
|
Interface |
RS232 - 9600baud |
Channels
available (for each sensor in use) |
Pressure Sensor temperature Message TX counter |
|
Main
Connector |
AS007-35PN, |
RF
Connector |
SMA |
|
Dimensions |
82mm x 42mm x 22mm |
Weight |
80g approx. |
|
Material |
6061 Aluminium - hard anodised finish |
Sealing |
IP67 |
