An increasing multitude of functions rely on a spectral analysis of wheel speed sensor (WSS) data, most prominent examples are iTPMS and Loose Wheel Monitoring. The spectral analysis requires that the raw, that means un-processed sensor data is available to the respective algorithm. Traditionally, this led to the brake ECU to which the WSS are hardwired becoming the host ECU for such applications. This has though several downsides and vehicle manufacturers in many cases want to host such functions in other, centralized ECUs to which the raw WSS signals then need to be provided over data buses. These buses though have often only limited bandwidth which is insufficient for the lossless transmission of these signals, especially at higher driving speeds. There is therefore a need for a lossless packing algorithm and SW-module which can easily be integrated into the brake ECU which then can transmit these packed signals over the data bus to the central ECU where the functions are hosted.
Eclipse Wheel Speed Sensor Signal Packer provides a lossless packing algorithm and a software module that can be seamlessly integrated into the brake ECU (Electronic Control Unit). This solution will efficiently pack data signals, ensuring no loss of information, and allow the packed signals to be transmitted over the data bus to the central ECU, where the related functions are hosted.
Making Eclipse Wheel Speed Sensor Signal Packer a lossless packing SW-module available as FOSS will avoid a multitude of proprietary solutions. Instead, a generic packer SW-module shall be made available which for example can be integrated by brake system suppliers as default into their main path brake SW.
A key purpose of the project is to establish an open industry standard for losslessly packed WSS signals for subsequent spectrum analysis.
It shall avoid competition restrictions which otherwise could arise through the choice of a certain proprietary packer solution by the brake system supplier leading to incompatibility with applications from other sources selected by the vehicle manufacturer ("lock-in"). In the best case, it enables through interoperability creating an (admittedly small) ecosystem of WSS-spectrum-based functions from various, fairly competing players and promotes the creation of new and innovative solutions.
Due to applicable anti-trust laws, the co-operation of competing major players in a certain market is subject to strict limitations. It needs to be open, transparent, non-discriminating and may not restrict fair competition.
The Eclipse Foundation offers a suitable platform to facilitate an efficient and constructive co-operation in accordance with the anti-trust laws.
- Create, maintain and improve an interface and signal specification for the output of the packer module.
- Adapt the packer to new needs or technologies (both HW & SW) emerging in the future
- Ensure back/forward-compatibility between current and future versions of the packer module
- Create and release variants for special, but recurring/common needs
March 2025: Project created
April 2025: Project drafted, draft published
Mid 2025: Project start
EO2025: 1st release of documented packer module
Brake system suppliers, vehicle manufacturers, SW function suppliers
Source code of the currently used packer from NIRA Dynamics, see below.
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