Vehicle Display Redundancy With CPU Changeover Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing central processing units (CPUs) in vehicles, designed for consumer electronics, lack the necessary high graphics processing power and data rate for secure, high-resolution safety-critical displays, leading to increased costs and inefficiencies.
Innovation Solution
A redundant display system with two central processing units connected via a switch and communication link, allowing seamless switching between them to ensure continuous display operation, even in case of failure, without doubling processing power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single display device is used to present data signals in vehicles, then the device complexity is reduced, but the reliability of information display deteriorates due to potential single points of failure and limited redundancy
Solution Approach 1:
The display system is segmented into multiple independent display devices (first display device and second display device) that can independently present the same data signal. This segmentation provides redundancy so that if one display fails, the other can continue to display information, thereby improving reliability without requiring a highly complex integrated system.
Solution Approach 2:
The system changes the parameter of display quantity from single to multiple, and introduces configurability parameters (synchronized display mode vs. independent display mode) that allow flexibility in operation. This parameter change enables the system to adapt to different reliability requirements while maintaining manageable complexity through software-controlled configuration.
2Reliability
If multiple display devices are used to provide redundant information display, then the reliability improves, but the device complexity increases due to additional hardware and synchronization requirements
Solution Approach 1:
Multiple display devices perform the same universal function of presenting data signals. The system is designed so that each display device can independently fulfill the display function, making them interchangeable and simplifying the overall system architecture. This multi-functionality approach allows redundancy without requiring complex specialized components for each display.
Solution Approach 2:
The system creates copies of the data signal presentation across multiple display devices. By duplicating the display content on multiple devices, the system achieves redundancy through simple copying rather than complex processing, reducing architectural complexity while maintaining reliability.
3Reliability
If data signals are displayed independently on multiple devices, then the redundancy improves, but the loss of information increases due to potential inconsistencies between displays
Solution Approach 1:
The system implements feedback mechanisms where the controller monitors and manages the data signal distribution to multiple display devices. This feedback ensures that all displays receive and present consistent information, preventing information loss or inconsistency while maintaining the redundancy benefits of multiple displays.
Solution Approach 2:
The system performs preliminary synchronization of data signals to all display devices before independent presentation. By pre-coordinating the information content across displays, the system ensures consistency is established in advance, preventing information loss during independent operation while maintaining redundancy.
4Adaptability or versatility
If the system supports both synchronized and independent display modes, then the adaptability improves, but the device complexity increases due to additional control logic and configuration requirements
Solution Approach 1:
The system implements dynamic switching between synchronized display mode and independent display mode based on operational requirements. This dynamic capability allows the system to adapt to different scenarios (e.g., normal operation vs. redundancy-critical situations) while using a unified control architecture that manages both modes, thereby improving adaptability without proportionally increasing complexity.
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a system (10a, 10b) for redundantly displaying a data signal, the system (10a, 10b) having a first central processing unit (1) for generating a first data signal and a second central processing unit (2) for generating a second data signal, also having a first display unit (5, 5a), wherein the first central processing unit (1) is connected to the first display unit (5, 5a) for the purpose of displaying the first data signal, and a second display unit (6, 12), wherein the second central processing unit (2) is connected to the second display unit (6, 12) for the purpose of displaying the second data signal, and a first changeover switch (9, 9a), wherein the first display unit (5, 5a) is connected to the first central processing unit (1) and to the second central processing unit (2) via the first changeover switch (9, 9a), also having a communication connection between the first central processing unit (1) and the second central processing unit (2) for the purpose of interchanging data, and wherein the system (10a, 10b) is configured so as, if there is a failure or fault of the first central processing unit (1), to cause the first data signal to be displayed on the first display unit (5, 5a) by the second central processing unit (2) by changing over the first changeover switch (9, 9a) and the communication connection. The invention further relates to a vehicle.