Tyre Pressure and Infra-Red Sensor TPS-IR

The system consists of a powered pressure and temperature sensor with transmitter fitted to a wheel rim. This sends pressure and temperature data over an RF link to a compact receiver on the car. Sampling rates increase automatically when either a change in pressure is detected or when wheel inertia is detected. The system stops transmitting below a threshold pressure to preserve battery life. The receiver sends data to the car control via CAN.

In Detail

Electrical

  • On-board KTY82-210 temperature sensor
  • Temperature sensor range -50°C to +150°C
  • Temperature resolution 0.17°C/bit

RF Specification

  • Compatible with High Baud rate TPR3
  • Modulation FM (FSK) encoded serial data
  • Nominal frequency 433.920MHz
  • Nominal baud rate 64kbps
  • Transmission range 15m (typ)
  • Each sensor transmits a unique serial number
  • All transmitted data is encrypted
    • (measured on full load)
Tx RateInertial switchPressureBoard TemperatureNominal Threshold dp/dt (mBar/s)Nominal Tx rate, Hz(s)Message type
0 X <0.3Bar <40°C 0 No TX (Internal sampling of pressure and Board temp at 0.4Hz)
1 X >0.3Bar <40°C 0.0167Hz 1, 1, 2, 1, 1, 3 cyclically (Internal sampling of pressure and Board temp at 0.4Hz)
2 LOW >0.3Bar >40°C 0.010Hz 1, 1, 2, 1, 1, 3 cyclically (Internal sampling of pressure and Board temp at 0.4Hz)
3 HIGH >0.3Bar X 2.0Hz 1, 1, 2, 1, 1, 3 cyclically
4 X >0.3Bar X 1.5 2.0Hz 1, 1, 2, 1, 1, 3 cyclically

Rate 0: applies when the pressure is

Rate 1: The IR element will not be enabled to preserve battery life. Therefore the IR measurements when operating in rate1 will not be valid.

Before the sensor changes to a lower Tx rate it will transmit 10 messages at the higher rate.

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 = 2.5V and temperature = 135°C.

Data Supplied

The following data is supplied on data disc for each sensor:

  • Full 16-bit ID serial number
  • Sensor output at two pressure set points measured at two temperature set points

Mechanical

  • Sensor incorporates Schrader valve in separate valve stem for tyre inflation
  • Sensor weight <45g
  • Valve stem 6AL4V Titanium (Ti Nitride coating)
  • Sensor housing PEEK GF30
  • 3/8UNF stud nut max torque 25Nm (18.4lbf/ft)
  • M6 sensor nut max torque 8Nm (5.9lbf.ft)

Environmental

  • Resistant to standard Motorsport fluids
  • Operating temperature
  • Vibration 50 to 2500Hz @ 40g eight hours per axis
  • Shock 50g(max), 1/2sine for 11ms, five times per axis

Images/Diagrams

O 030 330 046 XXX

O 030 330 046 XXX

Ordercodes

Description Ordercode
Combined Tyre Pressure and Infra Red Sensor O 030 330 046 075
Combined Tyre Pressure and Infra Red Sensor O 030 330 046 095
Valve stud O 030 330 990 018
Valve stud kit (O-ring, M6 K-nut, Schrader valve insert) O 030 330 990 023

Contact us about Tyre Pressure and Infra-Red Sensor

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The system consists of a powered pressure and temperature sensor with transmitter fitted to a wheel rim. This sends pressure and temperature data over an RF link to a compact receiver on the car. Sampling rates increase automatically when either a change in pressure is detected or when wheel inertia is detected. The system stops transmitting below a threshold pressure to preserve battery life. The receiver sends data to the car control via CAN.

McLaren Applied Technologies
Manufactured by: McLaren Applied Technologies
Model: Tyre Pressure and Infra-Red Sensor
Product ID: TPS-IR

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