IRTPTMS
The bf1systems InfraRed Tyre Pressure & Temperature Monitoring System (IRTPTMS) wheel sensor is an evolution of bf1systems’ existing Tyre Pressure Monitoring System (TPMS) technology, adding the ability to measure the tyre's inner carcass temperature in real-time.
The IRTPTMS introduces the ability to measure the tyre carcass temperature in real time via an infrared element mounted in the wheel sensor, in addition to the tyre’s pressure and air temperature.
The inner tyre carcass measurement is a measure of the tyre’s bulk temperature, which provides information on the mechanical grip available from the tyre, which relates to its long term behaviour. This measurement is of interest not only to race and tyre engineers, but also to chassis engineers as it allows them to better understand the impact of chassis setup changes on the tyre behaviour.
5 Pixel IRTPTMS
5 Pixel IRTPTMS
For 2017 bf1systems have introduced the 5 Pixel InfraRed Tyre Pressure & Temperature Monitoring System (IRTPTMS) wheel sensor which provides the ability to measure the inner tyre carcass temperature at 5 points over a 96° Field of View (FoV), with the customer able to select these five points prior to the build of the sensors.
The inner tyre carcass measurement is a measure of the tyre’s bulk temperature, which provides information on the mechanical grip available from the tyre, which relates to the long term behaviour of the tyre.
The infrared element has a total Field of View of 96° which can be angled to cover the maximum area of the inner tyre carcass. This FoV is sub-divided into 14 pixels (each of which has a 6.9° Fov), which the customer is able to select 5 of, prior to the build of the sensors, to have their measured temperatures transmitted as part of the sensor’s datagram.
This temperatures are then transmitted along with the internal air temperature, tyre pressure, sensor serial number, remaining battery life and other diagnostic data on a 433MHz RF link to antennas that are mounted on the vehicle, or to a handheld tool such as the Mini Analyser.
Specification
Electrical
- Supply Voltage – Internal 6V
- Lifetime (typical) – 1 year
Pressure
12.5mbar/bit Sensor
- Pressure Range – 0 – 3.1625bar gauge
- Pressure Resolution – 12.5mbar/bit
- Accuracy – ±25.0mbar
Tyre Carcass Temperature
- Temperature Range – -40°C – +215°C
- Temperature Resolution – 0.25°C/bit
- Accuracy – ± 2.5°C
Internal Temperature
- Temperature Range – -2°C – 150°C
- Temperature Resolution – 0.125°C/bit
- Accuracy – ±0.5°C
General
- Number of Measurement Points – 5
- Operating Temperature Range – 0°C – +140°
- Will Survive Excursions Up To +150°
- Mass – 33±1g
- RF Transmit Frequency – 433.92MHz
Transmission Information
- Moving Transmit Rate – 1Hz
- Stationary Transmit Rate – Every 255 seconds
- Transmit time at 1Hz after going stationary – 60 seconds
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Single Pixel IRTPTMS
Single Pixel IRTPTMS
The bf1systems InfraRed Tyre Pressure & Temperature Monitoring System (IRTPTMS) wheel sensor is an evolution of bf1systems’ existing Tyre Pressure Monitoring System (TPMS) technology and introduces the ability to measure the tyre carcass temperature in real time at a single point via an infrared element mounted in the wheel sensor
The inner tyre carcass measurement is a measure of the tyre’s bulk temperature, which provides information on the mechanical grip available from the tyre, which relates to the long term behaviour of the tyre.
The infrared element has a 35° Field of View (FoV) and is angled to measure the temperature of the tyre carcass specified by the customer. The sensor can be angled to measure part of the main tread, or even a sidewall temperature if required. This temperature is then transmitted along with the internal air temperature, tyre pressure, sensor serial number, remaining battery life and other diagnostic data on a 433MHz RF link to antennas that are mounted on the vehicle, or to a handheld tool such as the Mini Analyser.
The wheel sensor also contains a 125kHz Low Frequency (LF) receiver, meaning that on closed wheel race cars a learning system can be fitted which automatically detects where a sensor is fitted on the car. The LF receiver is also used by handheld tools such as the Mini Trigger and Mini Analyser which use this feature to request data on demand from the wheel sensor.
Specification
Electrical
- Supply Voltage – Internal 6V
- Lifetime (typical) – 1 year
Pressure
25mbar/bit Sensor
- Pressure Range – 0 – 5.375bar gauge
- Pressure Resolution – 25mbar/bit
- Accuracy – ±25.0mbar
14.7mbar/bit Sensor
- Pressure Range – 0 – 3.631bar gauge
- Pressure Resolution – 14.7mbar/bit
- Accuracy – ±29.4mbar
12.5mbar/bit Sensor
- Pressure Range – 0 – 3.1625bar gauge
- Pressure Resolution – 12.5mbar/bit
- Accuracy – ±25.0mbar
Tyre Carcass Temperature
- Temperature Range – -40°C – +215°C
- Temperature Resolution – 0.25°C/bit
- Accuracy (worst case) – ± 3.0°C
- Accuracy (best case) – ±0.5°C
Internal Temperature
- Temperature Range – -2°C – 125°C
- Temperature Resolution – 0.125°C/bit
- Accuracy – ±0.5°C
General
- Number of Measurement Points – 1
- Operating Temperature Range – 0°C – +125°
- Mass – 44±1g
- RF Transmit Frequency – 433.92MHz
Transmission Information
- Moving Transmit Rate – 1Hz
- Stationary Transmit Rate – Every 255 seconds
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