Bus Subscriber Polarity Addressing for Automotive Systems
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Solution Overview
Problem
Existing methods for addressing bus subscribers in automotive systems, such as control devices or sensors, are costly and space-intensive, particularly when only two subscribers are needed, as they require sequential galvanic separation or coded pins for addressing, which are not efficient for identical device designs.
Innovation Solution
The method involves detecting the polarity of the DC voltage at the bus subscriber's input to assign a predefined address, eliminating the need for an address circuit and coded pins, allowing identical bus subscribers to be differentiated by polarity, with a bridge rectifier ensuring operation regardless of polarity and reducing wiring complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential galvanic separation or coded pins are used for addressing bus subscribers, then addressing capability is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the addressing function from complex address circuits or coded pins and implements it through a simple polarity detection mechanism. The DC voltage input polarity serves as the address identifier, eliminating the need for separate addressing hardware components in each bus subscriber.
Solution Approach 2:
The patent introduces the DC voltage polarity as an intermediary carrier for address information. Instead of using dedicated address circuits or coded pins, the system uses the polarity of the power supply voltage as a mediator to convey addressing information to the bus subscriber.
2Reliability
If coded pins or address circuits are implemented in each bus subscriber, then individual addressing is enabled, but manufacturing cost and device space increase
Solution Approach 1:
The DC voltage input serves multiple functions simultaneously: it provides power supply to the bus subscriber and encodes addressing information through its polarity. This multi-functionality eliminates the need for separate addressing components, reducing manufacturing complexity and cost while maintaining individual addressing capability.
Solution Approach 2:
The bus subscriber automatically determines its address by detecting the polarity of the DC voltage it receives. No external addressing configuration or additional hardware is needed - the device self-identifies through the power supply polarity, simplifying both manufacturing and deployment.
3Device complexity
If polarity detection is used for addressing, then device design is simplified and cost reduced, but polarity reversal protection becomes critical
Solution Approach 1:
The patent applies preliminary protective measures against polarity reversal by implementing detection mechanisms that identify incorrect polarity connections before they can cause damage. The system proactively prevents harmful effects by detecting and responding to polarity errors before they result in device failure or data corruption.
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
This approach enables cost-effective and space-efficient addressing of exactly two bus subscribers in automotive systems, reducing the need for additional wiring and allowing identical device designs, while ensuring reliable polarity detection and voltage supply.
Implementation Method 1
a bridge rectifier is advantageously integrated in the bus subscriber. The rectifier rectifies the DC voltage present at the DC voltage input so that the bus subscriber can be supplied with the supply voltage rectified as defined
Implementation Method 2
the computing unit determines the potential on at least one path of the DC voltage input, in particular on exactly one path or on both paths of the DC voltage input. In this way, the computing unit establishes the polarity of the DC voltage at the DC voltage input
Data Source
AI summary
The invention relates to a method for addressing at least one bus subscriber, in particular a control device or sensor, which is connected to a bus system for the purpose of exchanging data, and which is supplied with DC voltage in order to supply the bus subscriber with supply voltage rectified as defined via a DC voltage input of said bus subscriber. It is proved according to the invention that the respective bus subscriber detects the polarity of the DC voltage at its DC voltage input, selects a predefined address depending on the detected polarity, and assigns the selected address to itself for the purpose of exchanging the data. The invention further relates to the bus subscriber and a system consisting of a bus system and exactly two bus subscribers of such kind. The invention also relates to a motor vehicle.