Bus Interface Clock Shutdown for Faulty Communication Isolation
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Solution Overview
Problem
Conventional methods for switching off communication in vehicles with data bus systems often result in unnecessary shutdown of all interfaces when a single faulty interface is identified, and in high-frequency transmissions, connected components can interfere with signal integrity during the shutdown process.
Innovation Solution
The method involves switching off the reference clock signal, allowing individual interfaces to be selectively deactivated without affecting other interfaces, using either a supply voltage or enable signal switch to prevent the generation and transmission of data and clock signals, thereby isolating faulty communication without influencing other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the complete bus subscriber is switched off when a fault is detected, then the faulty communication is stopped, but all interfaces of the bus subscriber are switched off including those that are operating correctly
Solution Approach 1:
The bus subscriber is segmented into multiple independent interfaces, each capable of being switched off individually. The switch-off signal is directed only to the specific interface that detected the fault, allowing other interfaces to continue operating normally. This segmentation resolves the contradiction by isolating the faulty interface while maintaining productivity of healthy interfaces.
2Reliability
If individual transmission lines are switched off to stop faulty communication, then the faulty interface is isolated, but components connected to the transmission lines continue to influence the signal during deliberate transmission
Solution Approach 1:
The reference clock signal, which is the root cause enabling signal generation, is extracted and switched off at its source. This removes the enabling factor for the faulty transmission before the data signal is generated, preventing connected components from influencing the signal during transmission. The clock signal switch-off occurs upstream of the data transmission path, effectively taking out the harmful influence.
3Reliability
If the reference clock signal is switched off to prevent data transmission, then the bus subscriber cannot generate or transmit valid data, but the switch-off must be precise to avoid affecting other interfaces
Solution Approach 1:
The switch-off mechanism is applied locally at each interface level rather than globally at the bus subscriber level. Each interface has its own switch-off capability that affects only its local reference clock signal. This local quality approach allows precise control where the switch-off function is tailored to the specific interface needs, managing complexity through distributed rather than centralized control.
Data Source
AI summary
A method is described for switching off a communication between at least two bus subscribers, which are connected to one another via a data bus and which transmit during the communication respectively one transmission clock signal in addition to a data signal, at least one of the bus subscribers generating its transmission clock signal and its data signal based on a reference clock signal, as well as a corresponding communication system. In the case of a fault, the reference clock signal is switched off so that the at least one affected bus subscriber no longer transmits a transmission clock signal and no longer transmits a data signal, and the faulty communication is switched off.