Decentralized Capacitive Sensor Nodes for Convertible Top Safety
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Solution Overview
Problem
Existing safety systems for detecting body parts in dangerous vehicle areas are costly and inflexible due to the need for extensive shielding of capacitive sensor lines and centralized processing units, which complicates installation and increases interference susceptibility.
Innovation Solution
A decentralized safety system with sensor nodes containing capacitive sensors and processing units that transmit capacitance change data via a data transmission device, allowing for flexible placement and reducing the need for shielding, as capacitance change data is transmitted digitally rather than as physical measurement variables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized processing unit with decentralized capacitive sensors is used, then detection capability is achieved, but line shielding complexity and cost increase significantly
Solution Approach 1:
The system divides the monitoring function into independent sensor nodes, each with its own processing unit. This segmentation eliminates the need for complex centralized processing and reduces line shielding requirements since each node processes signals locally before transmission.
Solution Approach 2:
The patent replaces the mechanical/electrical signal transmission system with heavy shielding requirements by using digital communication protocols (CAN bus, LIN bus, or wireless) that are inherently more resistant to electromagnetic interference, thus eliminating the need for complex shielding.
2Measurement precision
If extensive line shielding is implemented for capacitive sensor connections, then measurement accuracy is improved, but implementation cost and installation complexity increase
Solution Approach 1:
The patent substitutes the vulnerable analog capacitance measurement system with a digital system where sensor nodes perform local processing and transmit digital signals. This replacement maintains measurement precision while eliminating the need for expensive and complex shielded cables.
Solution Approach 2:
The sensor nodes perform preliminary processing of capacitance changes locally, converting raw measurements into processed data before transmission. This preliminary action ensures measurement accuracy is maintained while simplifying the transmission requirements and reducing overall system cost.
3Reliability
If specialized connectors and shielded lines are used for sensor connections, then signal integrity is maintained, but system adaptability and flexibility decrease
Solution Approach 1:
The sensor nodes use standardized digital communication interfaces (CAN, LIN, or wireless protocols) that are universally applicable and can be integrated into existing vehicle networks. This universality maintains signal integrity through protocol error checking while enabling flexible sensor placement throughout the convertible top structure.
Solution Approach 2:
By creating self-contained sensor nodes with integrated processing units, the system achieves modular design that can be freely positioned and configured. Each node operates independently, providing adaptability and versatility in sensor placement without compromising signal integrity through digital communication.
4Reliability
If capacitive sensors are placed close to moving parts for hazard detection, then detection effectiveness improves, but susceptibility to electromagnetic interference increases
Solution Approach 1:
The patent replaces the vulnerable analog capacitance measurement system with a digital system where local processing at sensor nodes converts raw signals to digital data. This substitution maintains detection effectiveness for hazard zones near moving parts while digital communication inherently resists electromagnetic interference from motors and power systems.
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 achieves reliable detection of body parts in dangerous areas with reduced implementation costs and increased flexibility in sensor placement, minimizing interference and simplifying existing data transmission line usage.
Implementation Method 1
the capacitive sensor has at least one electrode and is designed to capture a capacitance change on account of a body part approaching the electrode
Data Source
AI summary
A safety system for detecting a body part in a dangerous area of a vehicle, a convertible roof having such a safety system and a corresponding method. The safety system includes at least one sensor node which respectively has a capacitive sensor and a processing unit, wherein the capacitive has at least one electrode and is designed to capture a capacitance change on account of a body part approaching the electrode, and wherein the processing unit is designed to generate capacitance change data on the basis of a capacitance change captured by the capacitive sensor; an evaluation unit which is designed to detect that there is a body part in a dangerous area at least on the basis of received capacitance change data; a data transmission device for transmitting the generated capacitance change data from a sensor node to the evaluation unit.