Sensor Synchronization via Polarity-Reversal Signaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sensor synchronization methods in motor vehicles lack robustness and interference immunity, especially when sensors are distributed throughout the vehicle, requiring a more precise and cost-effective solution for data transmission synchronization.
Innovation Solution
A method and sensor arrangement utilizing a data request signal with pulse-shaped synchronization signals and voltage-coded data signals, where the electronic control unit generates synchronization signals with polarity reversal and modulates data transmission via a two-line interface, incorporating a rectifier circuit, polarization detector, zero crossing detector, and mode switch to ensure reliable data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensors are distributed throughout the vehicle with 2-wire current interface, then coverage and flexibility are improved, but interference immunity and signal robustness deteriorate
Solution Approach 1:
The patent replaces conventional voltage-based digital signaling with magnetic field-based communication. The ECU generates magnetic fields through a coil that encode data, and the sensor detects these fields magnetically. This substitution of the transmission medium (from electrical voltage to magnetic fields) provides immunity to electrical interference while maintaining flexible distributed sensor deployment throughout the vehicle.
Solution Approach 2:
The patent changes the fundamental parameter of signal transmission from voltage level changes to magnetic field strength and polarity changes. By using alternating magnetic polarities to encode binary data (positive polarity for logic 1, negative polarity for logic 0), the system achieves interference immunity while maintaining adaptability for distributed sensor configurations.
2Measurement precision
If precise synchronization is achieved through complex signaling protocols, then data correlation accuracy is improved, but system complexity and cost increase
Solution Approach 1:
The patent implements self-service synchronization where the sensor autonomously detects magnetic polarity transitions and generates synchronization pulses internally. The sensor's own detection circuitry identifies the falling edge of the magnetic field signal and uses it to trigger measured value recording, eliminating the need for external synchronization circuitry or complex protocols in the ECU.
Solution Approach 2:
The patent uses periodic magnetic field signals with regular polarity reversals to establish synchronization. The ECU sends periodic magnetic signals that create predictable falling edges, which the sensor uses as regular synchronization points for data recording. This periodic magnetic signaling provides precise timing correlation without complex synchronization mechanisms.
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 provides high immunity to interference and enables precise synchronization of sensor data transmission, ensuring robust and efficient communication between sensors and the electronic control unit, even with distributed sensors, while maintaining cost-effectiveness.
Implementation Method 1
The sensor (2) to ensure its energy supply, regardless of the polarity of the supply voltage signal or the synchronization signal, comprises a rectifier circuit, for example a bridge rectifier
Implementation Method 2
The sensor is preferably designed such that it comprises a polarization detector and a zero crossing detector, which are designed and arranged in such a way that they detect a change in polarization
Implementation Method 3
The sensor is preferably designed such that it comprises a polarization detector and a zero crossing detector, which are designed and arranged in such a way that they detect a change in polarization and a zero crossing of the supply voltage signal or synchronization signal
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a method for synchronizing sensors in a sensor array, comprising at least one electronic control unit (1) and at least one sensor (2), which are connected to each other by means of a first (3) and a second (4) line, wherein the sensor (2) is supplied with electric power by means of the first and second lines, and additionally at least one data signal (a) is transmitted by means of the first and second lines from the sensor (2) to the electronic control unit (1), wherein the electronic control unit (1) transmits a defined supply voltage signal having varying polarity as a synchronization signal (b, c) to the sensor (2), whereupon the sensor transmits at least one data signal (a) to the electronic control unit, after the polarity of the synchronization signal has been reversed.