McLaren Applied Technologies

Tyre Pressure Monitoring System Infra-Red Array

The system consists of a powered pressure and IR temperature array sensor with transmitter fitted to a wheel rim. This sends pressure and temperature data over an RF link to a compact receiver. Sampling rates increase automatically depending on tyre conditions and the sensor will shut down below a threshold pressure to preserve battery life. The receiver sends data to the car control via CAN.

There are two variants of receiver: flying lead version and connector version designed for use on Moto GP super bikes. A single receiver unit is used for receiving data messages from a front and rear tyre sensor.

The sensors and receiver are given a unique team ID number restricting data visibility

In Detail

Electrical

WHEEL SENSOR

  • Supply voltage 2.8 – 3.6 V (internal lithium thionyl chloride battery)
  • Lifetime> 1,000,000 transmissions
  • Transmission count included in transmitted data
  • Battery voltage measured on full load
  • Transmission rate: Governed by rate of change of pressure, temperature and rotation of the wheel. Structured to preserve battery life.

Tyre Pressure

  • Pressure range 0.3 – 7Bar (4.4 – 100psi)
  • Pressure resolution 4mBar/bit (0.06psi/bit)
  • Pressure accuracy ±10mBar (±0.15psi) typical, ±20mBar (±0.3psi) max
  • Self compensated over temperature range

Tyre Temperature (Infra Red (IR) array sensor)

  • Object temperature -20°C to +300 °C           
  • 120° Field of View (FOV)
  • 5 tyre temperature points (T1 – T5)
  • Temperature resolution 0.078°C/bit
  • Temperature accuracy ±3°C
  • Repeatability ±1°C

Board Temperature

  • On board PTC temperature sensor
  • Temperature sensor range -10°C to +190°C
  • Temperature resolution 0.17°C/bit

RECIEVER

  • Supply voltage 8 to 16Vdc
  • Supply current <50mA max at 12Vdc
  • Can bus 2.0B active

Mechanical

WHEEL SENSOR

  • Sensor weight <50g
  • Sensor housing un plated 2014 (HE15) aluminium alloy
  • Straight valve/stud kit available separately (ref. drawing sheet 6) which contains:
    6AL4V titanium valve/stud with 1.5mm inlet hole
    Schrader valve core (fitted)
    200-804 Viton O-ring (fitted)
    M6 k-nut (see drawing sheet 6 for recommended torque to sensor body)
    8V1 nut (see drawing sheet 6 for recommended torque to wheel rim)
  • Right angled valve/stud kit available separately (ref. drawing sheet 6) which contain
    6AL4V titanium valve/stud with 1.5mm inlet hole
    Schrader valve core (fitted)
    200-804 Viton O-ring (fitted)
    M6 k-nut (see drawing sheet 6 for recommended torque to sensor body)
    Spacer

RECIEVER

  • Weight <40g
  • Aluminium alloy body, hard anodised and dyed black

Connection Definition

  • Cable length 1000mm
  • 55 spec 26AWG unscreened cable

Wire colour

Description

Red

Supply

Black

Ground

Blue

CAN+

White

CAN-

  • DR-25 jacketed cable
  • Antenna connector SMA socket

Case

RF ground

Centre

RF in

Connection Definition (Connector version)

  • Connector: Deutsch ASX002-05PN
  • Pin designation: 

Pin number

Description

Pin 1

Supply

Pin 2

Ground

Pin 3

CAN+

Pin 4

CAN-

Pin 5

Not connected

  • Antenna connector SMA socket 

Case

RF ground

Centre

RF in

RF Specification

WHEEL SENSOR

  • Modulation FM (FSK) encoded serial data
  • Nominal frequency 433.920MHz
  • Nominal baud rate 71kbps
  • Transmission range >5m
  • Each sensor transmits a unique serial number
  • All transmitted data is encrypted 

Message Type 1 (4.704ms duration)
<Team ID>
<Serial Number>
<Sensor Type>
<Message Type>
<Pressure>
<Board Temperature>
<Battery Voltage
<TX Life>
<Acceleration>

Message Type 2 (4.704ms duration)
<Team ID>
<Serial Number>
<Sensor Type>
<Message Type>
<Temperature 1
<Temperature 2>
<Temperature 3>
<Temperature 4>
<Temperature 5>

DESCRIPTION PRESSURE BOARD TEMP. DELTA PRESS. WHEEL ROTATION Tx RATE MESSAGE SEQUENCE
Off Wheel Storage <0.3Bar NA <1.5mBar/s NO No Tx 1, 1, 1, .....
Inflated >0.3Bar <40°C <1.5mBar/s NO 0.016Hz (60s) 1, 1, 1, ....
Inflated & Heated >0.3Bar >40°C <1.5mBar/s NO 0.010Hz (10s) 1, 1, 1, ......
Pressure Change NA NA >1.5mbar/s NO 2.0Hz (0.5s) 1, 1, 1, 2, 1, 1, 1, 2, .....
Driving NA NA NA YES 2.0Hz (0.5s) 1, 2, 1, 2, 1, 2, .....

Before the sensor changes to a lower Tx rate it will continue the transmission during 10 seconds at the higher rate. 

Off Wheel Storage: Applies when the pressure is <0.3 Bar gauge. Sensor does not transmit but continues to sample the pressure, accelerometer, battery voltage and board temperature.

Rates quoted are for Vsupply = 3.6V and 25°C. Rates slow down linearly with increasing temperature and reducing Vsupply. Rates are ≈ 0.63 quoted values under combined worst case condition of Vsupply = 2.7V and temperature = 135°C.

RECIEVER

  • Modulation FM (FSK) encoded serial data
  • Nominal frequency 433.920MHz
  • Nominal baud rate 71kbps
  • Antenna supplied. Can be mounted directly to receiver or connected via coax extension cable

Environmental

WHEEL SENSOR

  • Resistant to standard motorsport fluids
  • Operating temperature +10 to +135°C
  • Vibration 50 to 2500Hz @ 40g, 8 hrs per axis
  • Shock 50g per axis, 1/2 sine for 11ms

RECIEVER

  • Resistant to standard motorsport fluids
  • Operating temperature +10 to 85°C
  • Vibration 100 to 1000Hz random spectrum for 2 hours in connector axis 

100Hz       

0.00395g2/Hz

200Hz

0.08573g2/Hz

300Hz

0.27121g2/Hz

650Hz

0.00482g2/Hz

1000Hz

0.01039g2/Hz

Images/Diagrams

Combined Tyre Pressure and Infra Red Array sensor

O 030 330 046 110

Combined Tyre Pressure and Infra Red Array sensor

Combined Tyre Pressure and Infra Red Array sensor

Sensor housing and stud designs can be tailored to suit individual wheel rims. The outline drawings shown within this product summary are examples for which other bespoke designs may be based upon. Pl

Combined Tyre Pressure and Infra Red Array sensor

Right Angled Stud Kit

O 030 330 990 075

Right Angled Stud Kit

Straight Stud Kit

O 030 330 990 064

Straight Stud Kit

Flying Lead TPTASS Receiver

O 030 330 046 112

Flying Lead TPTASS Receiver

Connector Version TPTASS Receiver

O 030 330 046 115

Connector Version  TPTASS Receiver

Ordercodes

Description Ordercode
Connector Version TPTASS Receiver O 030 330 046 115
Combined Tyre Pressure and Infra Red Array sensor O 030 330 046 110
Flying Lead TPTASS Receiver O 030 330 046 112
Straight Stud Kit O 030 330 990 064
Right Angled Stud Kit O 030 330 990 075
Receiver Antenna O 030 330 990 008
Antenna cable assembly (1m) O 030 330 990 076

Contact us about Tyre Pressure Monitoring System - IR Array

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The system consists of a powered pressure and IR temperature array sensor with transmitter fitted to a wheel rim. This sends pressure and temperature data over an RF link to a compact receiver. Sampling rates increase automatically depending on tyre conditions and the sensor will shut down below a threshold pressure to preserve battery life. The receiver sends data to the car control via CAN.

There are two variants of receiver: flying lead version and connector version designed for use on Moto GP super bikes. A single receiver unit is used for receiving data messages from a front and rear tyre sensor.

The sensors and receiver are given a unique team ID number restricting data visibility

McLaren Applied Technologies
Manufactured by: McLaren Applied Technologies
Model: Tyre Pressure Monitoring System
Product ID: Infra-Red Array

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