LIN Transceiver Adaptive Baud Rate for Sensor Data
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Solution Overview
Problem
The increasing number of sensors in modern automobiles, particularly in autonomous vehicle systems, places a significant burden on communication buses due to the need for high-frequency sensor measurements, which can lead to reliability issues and increased electromagnetic interference, while also requiring cost-effective and minimally complex solutions.
Innovation Solution
The implementation of transceivers that operate on a local interconnect network (LIN) bus with adaptive baud rates, allowing for fast-data messages to be sent at higher rates while maintaining compatibility and minimizing spectral energy, using pulse shaping techniques to limit electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the baud rate is increased to handle higher sensor data rates, then productivity is improved, but electromagnetic interference increases
Solution Approach 1:
The system dynamically adjusts the baud rate based on the data transmission requirements. Standard LIN frames are transmitted at 20 kbaud for low-data-rate communications, while fast-data frames utilize 80 kbaud when high bandwidth is needed. This dynamic adaptation allows the system to achieve high productivity when necessary while minimizing electromagnetic interference during normal operations.
Solution Approach 2:
The patent implements periodic high-speed transmission bursts for fast-data frames rather than maintaining a continuously high baud rate. The 80 kbaud transmission occurs only when fast-data frames need to be sent, while standard frames continue at 20 kbaud. This periodic high-speed action provides the necessary bandwidth for high-data-rate sensor communications while limiting the duration and impact of electromagnetic interference.
2Productivity
If additional bus conductors are added to increase data capacity, then productivity is improved, but device complexity increases
Solution Approach 1:
Instead of adding physical bus conductors, the patent changes the baud rate parameter from 20 kbaud to 80 kbaud to increase data capacity. This parameter change allows the existing single-wire LIN bus to carry more data by transmitting bits faster, thereby improving productivity without increasing device complexity or requiring additional conductors.
Solution Approach 2:
The patent transitions from increasing data capacity through spatial expansion (adding more wires) to temporal expansion (transmitting faster). By utilizing the time dimension through higher baud rates, the system achieves increased data capacity while maintaining the same physical bus structure, thus avoiding increased device complexity.
3Productivity
If the spectral energy content is increased to transmit more data, then productivity is improved, but electromagnetic interference increases
Solution Approach 1:
The system dynamically adjusts spectral energy content by switching between 20 kbaud and 80 kbaud transmission modes. During normal operations, the lower spectral energy content at 20 kbaud is maintained to minimize electromagnetic interference. When high data transmission capacity is required, the system temporarily increases spectral energy content by switching to 80 kbaud, thereby achieving high productivity while controlling overall electromagnetic emissions through selective activation.
Data Source
AI summary
Methods and transceivers are provided for enabling fast-data messages on a local interconnect network (LIN) compatible bus. One illustrative slave transceiver embodiment includes: a comparator and a digital-to-analog converter (DAC). The comparator detects amplitude modulation of a bias voltage at a first baud rate on a serial bus line to receive a first LIN frame header having a frame identifier for a fast-data frame. The DAC responsively drives a fast-data response message having an expanded payload and/or a higher baud rate on the serial bus line.