Tyre Pressure and Infra-Red Sensor (High Baud Rate)

Product Summary

McLaren Applied Technologies McLaren Applied Technologies McLaren Technology Centre Suite 115 Chertsey Road Bostick Building Woking 9801 West Kincey Avenue Surrey Huntersville GU21 4YH NC 28078 UK USA

Phone: +44 (0)1483 261400 [email protected] Phone: +001 (704) 660 3181 Fax: +44 (0)1483 261402 www.mclaren.com/mat Fax: +001 (704) 660 8829

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.

Electrical • Supply voltage 2.8-3.6V (internal Lithium Thionyl Chloride battery) • Lifetime1 > 300,000 transmissions • Transmission count included in transmitted data • Battery voltage measured on full load • Transmission rate: governed by rate of change of pressure and rotation of the wheel. Structured to preserve battery life. Tyre Pressure • Pressure range 4.4 to 30psi gauge (0.3 to 2.068 Bar) • Pressure resolution 0.01 psi/bit (0.69mBar/bit) • Pressure accuracy ±0.15psi (±10mBar) typical, ±0.3 psi (±20mBar) max Tyre Temperature (IR Sensor) • Output voltage

Target -20°C Output 0.30V

Target +150°C Output 2.70V

• Compensated temperature range +60°C to +120°C • Temperature resolution 0.052°C/bit • Temperature accuracy ±3°C • Repeatability ±1°C Board Temperature • 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 • Message content depends on type as follows: Message Type 1 (3.7ms duration) Message Type 2 (3.7ms duration)

McLaren Applied Technologies USA: McLaren Applied Technologies Phone: +44 (0)1483 261400 [email protected] Phone: +001 (704) 660 3181 Fax: +44 (0)1483 261402 www.mclaren.com/mat Fax: +001 (704) 660 8829 © McLaren Applied Technologies 2014 Revision Date: 2 Aug 2012 Page 2 of 5 Tyre Pressure and Infra-Red Sensor (High Baud Rate)

(measured on full load) Message Type 3 (3.7ms duration)

Tx Rate Inertial switch Pressure Board Nominal Nominal Tx Message type Temperature Threshold dp/ rate, Hz(s) dt (mBar/s)

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, (60.0s) 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, (10.0s) 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 (0.5s) cyclically

4 X >0.3Bar X 1.5 2.0Hz 1, 1, 2, 1, 1, 3 (0.5s) cyclically

Rate 0: applies when the pressure is <0.3 Bar gauge and Board Temperature is less than 40°C. Sensor does not transmit but continues to sample the pressure and board temperature.

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

McLaren Applied Technologies USA: McLaren Applied Technologies Phone: +44 (0)1483 261400 [email protected] Phone: +001 (704) 660 3181 Fax: +44 (0)1483 261402 www.mclaren.com/mat Fax: +001 (704) 660 8829 © McLaren Applied Technologies 2014 Revision Date: 2 Aug 2012 Page 3 of 5 Tyre Pressure and Infra-Red Sensor (High Baud Rate)

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 temperature2 +10 to +135°C • Vibration 50 to 2500Hz @ 40g eight hours per axis • Shock 50g(max), 1/2sine for 11ms, five times per axis

1 Assuming the sensor is subjected to the following conditions leading to and during a Formula1 race weekend: Rate0 – 240 Hours Rate1 – 91 Hours Rate2 – 4 Hours Rate3 or 4 – 1 Hour

2 Absolute maximum operating temperature +150°C. Operating the sensor above 135°C will reduce the life of the battery.

Description Ordercode

Combined Tyre Pressure and Infra Red Sensor O 030 330 046 075

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. Please contact MESL for further assistance.

McLaren Applied Technologies USA: McLaren Applied Technologies Phone: +44 (0)1483 261400 [email protected] Phone: +001 (704) 660 3181 Fax: +44 (0)1483 261402 www.mclaren.com/mat Fax: +001 (704) 660 8829 © McLaren Applied Technologies 2014 Revision Date: 2 Aug 2012 Page 4 of 5 Tyre Pressure and Infra-Red Sensor (High Baud Rate)

Description Dimension A Dimension B Dimension C Ordercode

Valve stud 3mm 26mm 4mm O 030 330 990 018

Description Dimension A Dimension B Dimension C Ordercode

Valve stud kit (O-ring, M6 22mm Ø16mm 30° O 030 330 990 023 K-nut, Schrader valve insert)