Bus Guardian Logic Circuit for Data Bus Fault Isolation
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Solution Overview
Problem
Existing control systems connected to a data bus face challenges in accurately identifying and managing faults, which can compromise safety by potentially transmitting erroneous signals, and require complex fault analysis and additional components for reliable shutdown.
Innovation Solution
A control system comprising a first control device, a second monitoring device, and a driver chip without an enable input, where the first control device deactivates its data output upon a fault signal from the second device, using a logic circuit to combine signals and maintain a high-impedance state, thereby simplifying fault determination and enhancing safety without external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driver chip with an enable input is used to allow external shutdown control, then the control system can reliably switch off the driver chip in fault states, but the driver chip requires additional connections and cannot be designed compactly
Solution Approach 1:
The enable input function is extracted from the driver chip and implemented within the control device itself. The control device integrates the shutdown logic and control signals internally, eliminating the need for an external enable input connection to the driver chip, thus achieving compact design while maintaining reliable shutdown capability.
Solution Approach 2:
The shutdown control functionality is merged into the control device, combining the monitor device and driver chip control into a single integrated unit. This integration eliminates external connections while ensuring reliable fault detection and driver chip shutdown through internal logic circuits.
2Reliability
If additional control devices and external components are provided for monitoring and shutdown control, then the security and reliability of the control system is increased, but the control system becomes more complex and requires more space
Solution Approach 1:
The monitor device and driver chip control functionality are merged into a single integrated control device. This integration maintains the security benefits of having a dedicated monitoring function while eliminating the need for separate external components and reducing overall system complexity.
Solution Approach 2:
The control device is designed to perform multiple functions: normal data output control, fault monitoring, and driver chip shutdown control. This multi-functionality eliminates the need for separate dedicated components for each function, reducing system complexity while maintaining security.
3Reliability
If the driver chip is switched off in a fault state, then erroneous data transmission is prevented, but fault analysis becomes elaborate requiring checking of different signal paths and dedicated fault determination signals
Solution Approach 1:
A dedicated fault determination signal path is introduced as an intermediary between the monitor device and the control logic. This separate signal path clearly indicates fault conditions without requiring complex analysis of existing signal paths, simplifying fault detection while maintaining safety through reliable driver chip shutdown.
4Reliability
If a logical combination of shutdown signals from multiple control devices is implemented, then the reliability of shutdown is improved, but additional components or integrated circuits outside the control devices are required
Solution Approach 1:
The logical combination function for shutdown signals is merged into the control device itself. The control device integrates multiple shutdown signal inputs and internally combines them using logic circuits, eliminating the need for external components or integrated circuits while maintaining reliable shutdown functionality.
Data Source
AI summary
A control system is disclosed, including a first control device, a second control device and a driver component for driving signals on a data bus. The first control device includes a data output which is connected to a data input of the driver component, and a monitoring device for deactivating the data output in the event of a fault. A deactivation signal of the second control device for the driver component is fed to a data input of the first control device, and the first control device is configured to deactivate the data output in the event of an error signal at the data input.