Sensor Position Identification via Data Bus Terminal Coding
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Solution Overview
Problem
Conventional parking assistance systems face challenges in accurately assigning sensor units to their positions due to the lack of unique identification features, leading to expensive and labor-intensive installation and replacement processes, and require multiple data lines for connectivity.
Innovation Solution
A device and method utilizing a data bus with distinguishable terminals for each sensor unit, where the connection scheme serves as an identity code, allowing sensor units to determine their position and communicate with a central control unit, eliminating the need for unique part numbers and minimizing installation effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor units are equipped with unique part numbers for identification, then sensor position assignment becomes possible, but manufacturing cost and installation complexity increase
Solution Approach 1:
The sensor unit automatically determines its own position by detecting which terminal receives the identification signal from the control unit. The sensor unit polls terminals and receives an identification value at one specific terminal, thereby self-identifying its position without requiring manual configuration or unique part numbers.
Solution Approach 2:
The system changes the electrical connection state parameter by providing different terminal configurations at different sensor positions. Each position has a unique terminal (e.g., terminal 1, 2, or 3) that receives the identification signal, creating distinct electrical parameter states that encode position information.
2Measurement precision
If separate data lines are provided for each sensor unit to predetermined positions, then sensor position assignment is achieved, but wiring complexity and installation effort increase
Solution Approach 1:
A single data bus serves multiple functions: it transmits sensor data from all sensor units and simultaneously transmits identification signals for position determination. This multi-functional data bus eliminates the need for separate dedicated data lines for each sensor position.
Solution Approach 2:
The identification signal transmission function is merged with the existing data bus infrastructure. Instead of adding separate identification wires, the system utilizes the existing data bus to carry both sensor communication and position identification signals.
3Measurement precision
If diagnostic functions are used during installation to determine sensor assignment, then position determination is possible, but installation time and cost increase
Solution Approach 1:
The terminal configuration is pre-designed during system manufacturing with distinct terminal assignments for each sensor position. This preliminary structural preparation eliminates the need for time-consuming diagnostic procedures during installation, as the position information is inherently encoded in the terminal connections.
Solution Approach 2:
The sensor unit automatically performs position determination by polling terminals and receiving the identification signal, eliminating the need for installer intervention or manual diagnostic procedures. The system self-configures upon installation.
Data Source
AI summary
A device and a method determine sensor positions of sensor units of a driver assistance system, especially a parking aid system of a vehicle. The sensor units each have a plurality of terminals of different identification positions. A data bus is connected for an exchange of data with a central control and evaluation unit in this case with one or more terminals of the sensor unit according to a specific connection scheme, which is different for each of the sensor units, in order to provide an identity code for the sensor position of a sensor unit in this way.