Bidirectional Sensor Node Synchronizes Data Transmission
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Solution Overview
Problem
In vehicle systems, sensor output data latency is high due to asynchronous data transmission, leading to increased sensor connections and electromagnetic interference, which complicates data synchronization and processing for controllers operating at faster speeds.
Innovation Solution
A bidirectional sensor node is configured to communicate sensor data in a serial data signal in response to a trigger signal, synchronizing data transmission and storage, reducing the need for external synchronization signals and minimizing electromagnetic interference by using formats like Single-Edge Nibble Transmission (SENT) or Pulse Width Modulation (PWM).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the controller polls the sensor periodically for data, then the sensor can operate at lower speeds, but the data transmission latency increases and synchronization becomes difficult for fast-operating controllers
Solution Approach 1:
The sensor operates in periodic cycles between active transmission mode and low-power sleep mode. During each cycle, the sensor remains in sleep mode until a trigger event occurs, then activates to transmit data and return to sleep. This periodic operation enables fast controllers to synchronize efficiently while reducing overall data transmission latency compared to continuous polling.
Solution Approach 2:
The sensor system uses self-service triggering where the sensor autonomously monitors for trigger events and initiates data transmission without requiring continuous controller polling. The sensor manages its own activation and deactivation cycles, enabling it to service fast controllers efficiently while minimizing latency through event-driven operation.
2Reliability
If multiple separate connections are used to provide trigger signals to the sensor, then synchronization can be achieved, but the number of connections and circuit area increase
Solution Approach 1:
The trigger signal connection is merged with the existing bidirectional data communication node between the controller and sensor. The same physical node that carries sensor output data also receives trigger signals from the controller, eliminating the need for separate trigger connection lines and reducing overall system complexity while maintaining synchronization reliability.
Solution Approach 2:
The bidirectional node is designed with multi-functionality, serving both as a data output channel for the sensor and as a trigger signal input channel from the controller. This universal node handles multiple functions through the same physical connection, reducing the total number of connections required while ensuring reliable synchronization.
3Reliability
If more sensor connections are added to the system, then synchronization capability improves, but electromagnetic interference increases
Solution Approach 1:
By merging the trigger signal transmission function into the existing bidirectional data node, the system avoids adding new separate connection lines. This consolidation reduces the total number of signal paths in the system, thereby minimizing the sources of electromagnetic interference while preserving full synchronization capability.
Solution Approach 2:
The system converts the potential harm of additional connections (which would increase EMI) into a benefit by using the existing bidirectional node for dual purposes. The same node that already carries data signals is also used for trigger signals, transforming what would be an EMI-problematic addition into an efficient use of existing infrastructure that actually reduces overall EMI.
Data Source
AI summary
A magnetic field sensor including a bidirectional node is configured to perform at least one of generating sensor data, storing sensor data, or communicating sensor data in a serial data signal in response to a trigger signal received at the bidirectional node. An alternative sensor having a node that may or may not be a bidirectional node is configured to reset at least one of a sensor data signal, a clock, a register, or a counter in response to a trigger signal received at the node and is further configured to communicate the sensor data signal in response to the trigger signal.