Power-Selecting Control Circuit for Redundant Data-Line Supply
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Solution Overview
Problem
The existing configuration for power source redundancy in advanced vehicle systems, such as those required for Level 3 or higher automated driving, faces challenges in efficiently managing power supply while minimizing the increase in the number of wiring harnesses.
Innovation Solution
The proposed electronic control device incorporates a power source terminal connected to a first power source, a data terminal for data communication and power reception, an internal data line for data signal transfer, and a power source selection circuit that chooses the higher potential power source from the internal power source and the external data line to supply to the data processing circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual system configuration with separate power sources and power lines is used for redundancy, then system reliability is improved, but the number of wiring harnesses increases
Solution Approach 1:
The patent combines the power supply function and data communication function into a single wiring harness. The data line is designed to carry both data signals and power, eliminating the need for separate power lines. This merging of functions reduces the number of wiring harnesses while maintaining redundancy through the power source selection circuit that can switch between the first power source and the second power source.
Solution Approach 2:
The data line is given multi-functionality by enabling it to transmit both data signals and power. This universal usage of the data line for dual purposes (data communication and power supply) reduces the overall number of wiring harnesses required in the system while maintaining the redundancy capability through intelligent power source selection.
2Measurement precision
If the number of pixels in camera sensor is increased for higher resolution, then detection accuracy is improved, but the amount of data required increases
Solution Approach 1:
The patent implements preliminary action by performing data processing and filtering at the source (in the electronic control device) before data transmission. This preliminary processing reduces the amount of raw data that needs to be transmitted over the network while preserving the essential detection accuracy information, thereby managing the large data volumes generated by high-resolution sensors.
3Speed
If 10 Gbps-class high-speed communication is adopted, then data transmission speed is improved, but the requirement for impedance-matched power lines increases device complexity
Solution Approach 1:
The patent merges power supply and data communication functions into the same wiring harness, which requires impedance matching for high-speed communication. This integration means that the power line must meet communication specifications, but it eliminates the need for separate dedicated communication lines, potentially reducing overall system complexity despite the increased requirements for the combined line.
Data Source
AI summary
An object of the present invention is to provide an electronic control device and an electronic control system capable of achieving power supply redundancy while suppressing an increase in number of wirings. The present invention is an electronic control device 1 including a data processing circuit that performs data communication with one or more another electronic control devices, the electronic control device 1 including: a power source terminal 105 connected to a first power source 60; a first data terminal 101a to which a first external data line is connected; and a power source selection circuit that has an input side to which the power source terminal 105 and the first data terminal 101a are connected and an output side to which the data processing circuit 100 is connected, selects any one with a higher potential of power from the power source terminal 105 and the first data terminal 101a on the input side, and connects the selected one to the data processing circuit on the output side.