Vehicle ECU Identification via CAN Bus Impedance Sensing
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Solution Overview
Problem
Integrating autonomous capabilities into mainstream consumer vehicles is challenging due to proprietary technologies and limited documentation, making it costly and time-consuming for third-parties to interface with existing systems.
Innovation Solution
An autonomous vehicle interface (AVI) system that identifies and controls electronic control units (ECUs) by measuring bus impedance over a shared bus, such as a CAN bus, to determine which ECU is transmitting, enabling effective communication and control of vehicle systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If proprietary technologies and limited documentation are used by vehicle manufacturers, then vehicle system control and communication can be maintained securely and reliably, but third-party integration of autonomous capabilities becomes costly and time-consuming
Solution Approach 1:
The system enables ECUs to automatically identify themselves by transmitting their unique impedance characteristics onto the CAN bus. The AVI passively observes these transmissions and automatically builds a mapping between impedance signatures and ECU identities, eliminating the need for manual documentation or configuration by third-parties.
Solution Approach 2:
The patent replaces manual identification methods (mechanical/configuration-based approaches) with electrical impedance measurement. By substituting physical inspection or documentation review with automated electrical characteristic analysis, the system dramatically reduces integration time and cost while maintaining security.
2Loss of time
If manual identification and documentation methods are used for ECUs, then system security and reliability are maintained, but integration time and costs increase significantly
Solution Approach 1:
The system performs preliminary identification by having ECUs continuously transmit their impedance characteristics during normal operation. This pre-established impedance database is ready before third-party integration begins, eliminating the need for time-consuming manual identification during the integration phase.
Solution Approach 2:
The AVI acts as an intermediary between the ECUs and third-party autonomous systems. It intercepts and analyzes ECU transmissions on the CAN bus, extracting identification information without disrupting the existing secure communication protocols, thus bridging the gap between proprietary systems and third-party integrators.
3Extent of automation
If impedance measurement is used to identify ECUs, then automated identification and control is enabled, but additional measurement capabilities are required
Solution Approach 1:
The AVI performs multiple functions using the same impedance measurement capability: it identifies ECUs, monitors bus health, and tracks system changes over time. This multi-functionality reduces overall system complexity compared to having separate systems for each function.
Solution Approach 2:
The system continuously measures impedance characteristics and uses this feedback to update its ECU identification database in real-time. This feedback mechanism enables the system to adapt to changes in the vehicle electrical system while maintaining automated identification without requiring complex manual reconfiguration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates efficient identification and control of vehicle systems, reducing integration costs and time by providing a standardized method for interfacing with ECUs, allowing for autonomous operation and diagnostics of vehicle components.
Implementation Method 1
An autonomous vehicle interface (AVI) measures bus impedance over a shared bus, such as a CAN bus
Data Source
AI summary
Systems and methods that facilitate identifying and controlling the systems and subsystems in a vehicle to enable autonomous operation of the vehicle are disclosed. An autonomous vehicle interface (AVI) (the “AVI control system”) can interface with and control the system of the vehicle, thereby enabling control of the vehicle as a whole. Electronic control units may be associated with each of the systems and subsystems in the vehicle, and the AVI may interface with and control these electronic control units over a shared data bus. In order to control particular electronic control units, the systems and methods provide for sampling data packets transmitted by the electronic control units on the shared data bus, measuring the impedance of the shared data bus when data packets are being transmitted, and identifying particular electronic control units based on the measured impedance.