Vehicle Detection Device Synchronization With Data Bus
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Solution Overview
Problem
Existing data exchange methods between detection devices in motor vehicles and their data buses suffer from latency fluctuations and synchronization issues, leading to 'slot jumping' and increased jitter in isochronous transmission modes.
Innovation Solution
A method that determines the scanning end time and adjusts the acquisition speed based on the time difference between the scanning end time and the start of the transmission window, ensuring a constant latency by synchronizing the sampling end time with the data bus's time pattern and allowing for step-wise adjustments of the acquisition speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection device repeatedly acquires scanning data at a fixed acquisition speed, then the data transmission follows a regular pattern, but latency fluctuations occur due to synchronization issues with the data bus time pattern
Solution Approach 1:
The computing unit continuously monitors the time difference between the scanning end time and the transmission window start time, and dynamically adjusts the acquisition speed based on this feedback to maintain constant latency
Solution Approach 2:
The acquisition speed is made dynamically adjustable rather than fixed, allowing the system to adapt the scanning rate to synchronize with the data bus transmission windows and eliminate latency variations
2Loss of time
If the acquisition speed is increased to reduce transmission delay, then the data freshness improves, but latency fluctuations increase and cause slot jumping
Solution Approach 1:
The system uses feedback control where the computing unit adjusts the acquisition speed based on the measured time difference, preventing both excessive delay and synchronization instability
Solution Approach 2:
The acquisition speed parameter is dynamically changed based on the time difference calculation, allowing the system to optimize between speed and stability by adjusting the scanning rate to match data bus availability
3Reliability
If the scanning data acquisition is synchronized with the data bus time pattern, then latency is minimized and kept constant, but the system requires continuous monitoring and adjustment of acquisition speed
Solution Approach 1:
The computing unit performs multiple functions: it processes scanning data, calculates timing differences, and controls acquisition speed adjustment, consolidating control functions in a single component
Solution Approach 2:
The detection device self-regulates its acquisition speed based on internal timing measurements, automatically synchronizing with the data bus without requiring external intervention
Data Source
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AI summary
The invention relates to a method for operating a detection device (1, 1') of a motor vehicle (15), which dection device is designed to detect a surrounding area (12, 12') of the motor vehicle (15), wherein the detection device (1, 1') communicates with a data bus (13) of the motor vehicle (15) for the purpose of data exchange and repeatedly detects scanning data from the surrounding area (12, 12'), comprising detection of scanning data via a scanning unit (2, 2') of the detection device (1, 1') at a detection rate, comprising definition of a scanning end time at which the detection of the scanning data is completed, by means of a computer unit (3, 3'), comprising determination of a time difference between the determined scanning end time and a starting time of one of the detection devices (1, 1') in accordance with a transfer window assigned to a protocol of the data bus by the computer unit (3, 3'), and comprising predefinition of the detection rate for a future detection of scanning data as a function of the time difference determined by the computing unit (3, 3'), in order to improve the synchronization of a detection device (1, 1') of a motor vehicle (50) with a data bus (13) of the motor vehicle (15).