CAN Bus Subscriber Station Pre-Distortion for Error Tolerance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
CAN bus systems face issues with error tolerance due to reflections and crosstalk caused by deviations in bus line impedance, leading to higher bit error rates and reduced data transfer quality, especially in systems with faster cycle times like CAN-FD.
Innovation Solution
A subscriber station with a transmission/reception device and a modification device that pre-distorts signals to equilibrate bus levels and adjusts detection points and thresholds, ensuring collision-free access and improved signal quality by using additional processing stages and transistors to control voltage levels and output resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If faster cycle timing is used to increase data rate in CAN-FD, then productivity is improved, but reliability deteriorates due to higher bit error rate
Solution Approach 1:
The patent applies preliminary action by pre-distorting the transmitted signal before it enters the bus system. The distortion compensation unit pre-compensates for expected signal degradation from reflections and crosstalk, so that the signal arrives at the receiver with optimal characteristics despite the high data rate. This allows faster cycle timing to be used without proportionally increasing bit error rate.
2Reliability
If signal distortion compensation is added to improve reliability, then error tolerance is improved, but device complexity increases
Solution Approach 1:
The patent introduces a distortion compensation unit as an intermediary component between the transmitter and the bus system. This unit acts as a mediator that pre-processes signals to counteract expected distortions from bus imperfections like reflections and crosstalk. By placing this compensation mechanism in the transmission path, the system achieves better error tolerance without requiring complex changes to the receiver or bus infrastructure.
Data Source
AI summary
A subscriber station for a bus system, and a method for improving the error tolerance of a subscriber station of a bus system, are presented. The subscriber station encompasses a transmission/reception device for transmitting a signal via the bus system to a further subscriber station and for receiving a signal via the bus system, in which exclusive, collision-free access by a subscriber station to a bus line of the bus system is guaranteed at least at times; and a modification device for modifying the transmission properties of a transmission path of the transmission/reception device and/or the reception properties of a reception path of the transmission/reception device.