Virtual Touchscreen Diagnostic System Bus Overload
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Solution Overview
Problem
Current automobile vehicle virtual touch screen systems face challenges in managing and processing large amounts of diagnostic data, leading to potential overload of the communication bus and increased complexity in data transmission and processing.
Innovation Solution
A fully integrated display module or touchscreen with a capacitive sensing grid that communicates touch events via a digital link to a virtual touchscreen and display device, which generates graphics, maps touch coordinates to functions, and identifies failed virtual switches, transmitting failure signals to a control unit via a CAN bus, thereby reducing data traffic and processing burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all touchscreen diagnostic data are transmitted frequently to the control unit, then diagnostic completeness is improved, but communication bus overload occurs
Solution Approach 1:
The patent segments diagnostic data into two categories: critical data (trace failures, bulk faults, power failures) transmitted immediately, and routine data (touch controller status, backlight driver status) transmitted periodically or on-demand. This segmentation prevents communication bus overload while ensuring critical diagnostic information is captured promptly.
Solution Approach 2:
The patent extracts and processes diagnostic data locally at the touchscreen controller before transmission to the control unit. The controller pre-processes raw touchscreen data, identifies failures, and transmits only relevant diagnostic information, reducing the overall data volume on the communication bus while maintaining diagnostic completeness.
2Measurement precision
If multiple diagnostic messages are transmitted periodically, then diagnostic accuracy is improved, but data processing burden increases
Solution Approach 1:
The patent implements preliminary filtering and classification of diagnostic messages at the touchscreen controller before transmission. The controller pre-identifies critical failures (trace open/short circuits, bulk faults) and prioritizes their transmission, while routine operational data is processed and transmitted less frequently, reducing the control unit's processing burden while maintaining diagnostic accuracy.
Solution Approach 2:
The patent establishes a feedback mechanism where the control unit receives prioritized diagnostic messages and sends acknowledgment or follow-up requests only when necessary. This feedback loop allows the system to maintain high diagnostic accuracy while minimizing unnecessary data processing and transmission cycles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system minimizes data transmission and processing complexity, reduces the number of components and connections required, and enhances diagnostic capabilities, leading to faster response times, improved fuel economy, and compliance with OBDII regulations while simplifying interfaces and reducing emissions.
Implementation Method 1
A fully integrated display module or touchscreen having a capacitive sensing grid. The touchscreen displays graphics and detects touch events using the capacitive sensing grid.
Data Source
AI summary
An automobile vehicle information system includes a touchscreen having a touchscreen capacitive sensing grid. The touchscreen displays graphics and detects touch events using the touchscreen capacitive sensing grid. A virtual touchscreen and display device is in communication with and receives the touch events detected by the touchscreen via a first digital communication link. The virtual touchscreen and display device generates graphics and maps touch coordinates to intended functions. A location of a failed virtual switch is mapped by the virtual touchscreen and display device based on screen coordinates provided by the touchscreen, the virtual touchscreen and display device generating a switch failure signal identifying the failed virtual switch. A control unit diagnoses the switch failure signal and generates a default action according to a virtual switch type.