Sensor Bus Initialization via Dominant Signal Priority
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Solution Overview
Problem
Existing sensor arrangements with multiple sensor devices face challenges in establishing a static activation order without user interaction and ensuring a limited initialization duration, particularly due to interference issues and random waiting times, which can lead to undefined initialization processes and failure to meet readiness delays.
Innovation Solution
A method where sensor devices use a communication line with dominant and subdominant electrical levels to serially transmit identification data, allowing for automatic address assignment and order determination without random waiting times, ensuring all devices can be easily added or removed while maintaining a defined activation order and limited initialization duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If random waiting times are used for initialization, then sensor devices can automatically establish activation order, but the initialization duration becomes undefined and may exceed readiness delays
Solution Approach 1:
The patent applies preliminary action by pre-assigning unique identification values to each sensor device before operation. During initialization, devices with lower identification values automatically gain priority to transmit dominant signals and establish their position in the activation order first. This pre-established identification system eliminates the need for random waiting times, as the activation order is determined deterministically by the pre-assigned identification values rather than by race conditions.
2Reliability
If multiple sensor devices operate simultaneously, then sensing coverage is improved, but interference between neighboring devices occurs
Solution Approach 1:
The patent implements periodic action through time-multiplexed operation where sensor devices are activated in a predetermined sequential order rather than simultaneously. Each device transmits during its assigned time slot, creating periodic activation cycles that eliminate interference while maintaining comprehensive sensing coverage. The system cycles through all devices in the array, ensuring each has dedicated transmission time.
Solution Approach 2:
The patent uses an intermediary mechanism in the form of a communication bus that mediates between multiple sensor devices. The bus transmits identification signals and activation commands in a controlled manner, allowing the control unit to coordinate device activation without direct device-to-device interference. This intermediary communication channel enables centralized management of the sensor array.
3Manufacturing precision
If manual presetting of activation order is required, then activation sequence is precise, but device complexity and setup time increase
Solution Approach 1:
The patent applies self-service by enabling sensor devices to automatically establish their own activation order during initialization without manual intervention. Each device reads its pre-assigned identification value and uses it to determine its position in the activation sequence autonomously. The control unit receives automatic registration of devices and configures the activation order based on the identification values, eliminating the need for manual presetting while maintaining precise activation sequencing.
Data Source
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AI summary
The invention relates to a method for operating a sensor device (2) in a sensor arrangement (3) including multiple sensors interconnected by a common communication line (7), comprising the steps of: - serially transmitting data on the communication line (7), wherein data are transmitted on the communication line (7) by applying a sequence of electrical levels, wherein the electrical levels include one dominant level and one or more subdominant levels, wherein only the dominant level is capable of overriding subdominant levels on the communication line (7); - monitoring the communication line (7); and - interrupting the transmission of data and/or blocking the transmission of data, in case a dominant level exists on the communication line (7) which has not been applied by the sensor device (2).