Sensor Bus Misconnection Detection via Signal Line Voltage Control
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Solution Overview
Problem
In control systems with multiple sensor devices connected through a common communication line, misconnection of sensor apparatuses can lead to incorrect fuel injection control due to erroneous node ID assignments, causing the electronic control apparatus to read and write characteristic values to the wrong devices, resulting in compromised performance.
Innovation Solution
The system employs a transmission control mechanism that sets signal lines to enabled or disabled states based on communication data, allowing sensor apparatuses to determine their connection state and discard or accept data accordingly, ensuring correct operation even if sensor apparatuses are misconnected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sensor apparatuses are connected through a common communication line with node ID assignments, then device complexity is reduced and ease of operation is improved, but misconnection leads to erroneous node ID assignments and incorrect control
Solution Approach 1:
The sensor apparatus transmits sensor signals through dedicated signal lines to the electronic control apparatus, which uses these signals as feedback to verify correct connection. The control apparatus compares the sensor signals received through signal lines with data received through the communication line to detect misconnection and prevent erroneous node ID assignment.
Solution Approach 2:
The sensor signal acts as an intermediary verification mechanism between the physical connection (signal line) and the logical connection (communication line with node ID). By introducing this intermediate verification step, the system can detect mismatches between physical and logical connections without adding complex hardware.
2Productivity
If the electronic control apparatus reads characteristic values from misconnected sensor apparatuses, then communication efficiency is maintained, but fuel injection control becomes incorrect
Solution Approach 1:
The system performs preliminary verification by comparing sensor signals received through signal lines with communication data received through the communication line before proceeding with node ID assignment and characteristic value reading. This preliminary check prevents subsequent control errors while maintaining efficient communication.
Solution Approach 2:
The system takes preliminary anti-action by detecting potential misconnection through the comparison mechanism and preventing the erroneous reading of characteristic values before the error can affect fuel injection control. This proactive error prevention maintains both communication efficiency and control accuracy.
3Reliability
If separate communication lines are used for each drive apparatus, then connection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the communication function and verification function into a single integrated system. Instead of using separate communication lines for each drive apparatus, the system combines the communication line with the signal line verification mechanism, achieving reliable connection detection without increasing physical line complexity.
Data Source
AI summary
The control system has a structure in which sensor apparatuses each having a data communication function are connected to an electronic control apparatus through a common communication line, and the sensors of the sensor apparatuses are connected to the electronic control apparatus through separate individual signal lines to transmit sensor signals to the electronic control apparatus. The electronic control apparatus is configured to, prior to transmitting communication data to one of the sensor apparatuses through the communication line, set the signal line connected to the selected sensor apparatus in a state in which the voltage of the signal line is outside a variation range corresponding to a voltage range of the sensor signal, and set the signal lines connected to the other sensor apparatuses to each of which the communication data is not addressed in a state in which the voltage of the signal line is within the variation range.