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Tecnología para evitar bits de relleno en comunicaciones CAN (red de área de controlador)


Oferta Tecnológica
Un grupo de investigación italiano ha obtenido la patente de una tecnología para mejorar la red de área de controlador (CAN), la red de comunicaciones para sistemas de control vehiculares, industriales e integrados. La tecnología evita la inserción de bits de relleno en el campo CAN CRC (verificación por redundancia cíclica), así como en la parte restante del marco. El grupo de investigación pone a disposición el códec de software, que se integra fácilmente en aplicaciones del mundo real. Se buscan socios con el fin de establecer acuerdos de licencia, financiación y cooperación en materia de investigación.


Avoiding stuff bits insertion in Controller Area Network Communications
An Italian Research group has patented a technology to ameliorate the Controller Area Network (CAN), the communication backbone for vehicular, industrial, and embedded control systems. The invention prevents the insertion of stuff bits in the CAN CRC - Cyclic Redundancy Check - field, as well as in the remaining part of the frame. A highly optimized software codec is available, which can be readily embedded in real-world applications. Licence, financial and research agreements are expected.
The Italian Researcher´s team which developed this technology and filed the related patent has considerable knowledge and skill about the CAN protocol, acquired over the past two decades, as well as its adoption in embedded systems, in particular with real-time constraints.
They belong to a Public Research Institute that carries out advanced scientific and technological research in the area of Information Engineering, covering fields of telecommunications, applied electromagnetics, computer and systems engineering, electronics, control and systems.
The proposed technology refers to an ameliorated CAN protocol. It permits to avoid stuff bits insertion in the Controller Area Network communication, the communication backbone for vehicular, industrial, and embedded control systems.
The physical layer in conventional CAN relies on a Non-Return-to-Zero coding with bit stuffing. This causes an undesirable variability in frame transmission time, known as jitter, because the number of stuff bits inserted in each frame specifically depends on the message content.
The bit-stuffing mechanism induces undesirable jitters in frame transmission time, which worsens application-level timings besides increasing the likelihood of undetected transmission errors.
The proposed technology prevents the occurrence of stuff bits in the Cyclic Redundancy Check (CRC) field. Hence, it secures a deterministic transmission time and improves the temporal accuracy and precision of distributed digital control systems where devices are interconnected using a CAN bus.
In addition, it significantly reduces the residual error probability, thus enhancing data integrity and system dependability, while still being fully compatible with standard CAN controllers. This technology sets the 3 last bits of the data field (tuning bits) to a value that shapes the CAN-calculated CRC in such a way that no stuff bits have to be sent. The method can coexist, and is meant to be used, with other coding methods that prevent stuff bit insertion in other parts of the frame, and in particular in the DATA field.
Application areas include high-accuracy, dependable CAN-based distributed real-time control systems, high-precision measurement instruments and actuation systems, machine tools for high-precision mechanical parts, and high-performance powertrain components.
The main innovation aspect of Zero Stuff encoding is that, both timing accuracy and data integrity can be noticeably improved in legacy CAN networks by using a simple and streamlined software codec. In addition, unlike, recent other proposals on this theme, there is no need to adopt modified CAN controllers.
The Research team´s commitment is to provide technical assistance for the integration of the existing ZS codec within a comprehensive software infrastructure and its interface with the underlying operating system and CAN device drivers.
Since the technical development of the ZS codec has already been carried out in-house and is available, the desired outcome of the partnership should be the exploitation of the invention in commercial products through licence agreements.
Finally, research cooperation agreements and financial agreements are also welcomed.
Advantages and Innovations:
The Zero Stuff technology offers two main advantages when compared to legacy CAN: 1) A reduction of frame transmission jitters to less than one bit time (in conventional CAN it can be as high as about 20 bits); 2) A reduction of the residual error probability by about two orders of magnitude with respect to CAN. The technology achieves efficient and cost-effective software implementations in the form of a thin codec located between application programs and conventional CAN drivers (hardware implementations are also possible).
Finally, this technology maintains full compatibility with existing CAN controllers and networks, which means that devices adopting Zero Stuff jitter-less communications can quietly coexist with legacy CAN devices in the same network. This is a significant advantage with respect to the CAN with other Flexible Data Rate (CAN FD) solutions already present on the market, whose new features cannot be exploited when legacy CAN devices are connected to the network.
Stage of Development:
Prototype available for demonstration
Patent(s) applied for but not yet granted
CommeR Statunts Regarding IPR Status:
Italian Patent granted
European Patent pending

Partner sought

Type and Role of Partner Sought:
A Licence Cooperation Agreement is foreseen with industrial partners.
The Research group offers interested industrial companies the opportunity to license the technology in order to use it commercially.
Potential licensees could be in different fields of activities, such as Mechatronics, Factory Automation, Automotive, Machine Tools, Instrumentation and Measurement.
The licensing agreement may include an option for further development regarding the partner´s requirements. In particular for a joint development of devices based on the Zero Stuff Technology.
A Research Cooperation agreement is expected with Industry and R-Y-D Institution. Different levels of involvement can be envisaged, e.g., technical consultancy for codec integration in the target architecture(s).


Type and Size of Client:
R&D Institution
Already Engaged in Trans-National Cooperation:
Languages Spoken:


Technology Keywords:
01001001 Automation, Robotics Control Systems
02009014 Electricidad y electrónica para automoción
01002004 Embedded Systems and Real Time Systems
02002009 Machine Tools
01006013 Protocolos de comunicaciones, interoperabilidad