Tachograph Data Storage During ADR Mode Shutdown
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Solution Overview
Problem
Fleet management systems face challenges in continuously and real-time capturing driver activity data from dangerous goods vehicles during the ADR mode, as the detection unit is switched off, resulting in a time gap in data availability and inability for real-time tracking.
Innovation Solution
The method involves a tachograph operating in ADR mode to record and store driver activity data, which is then transmitted to the registration unit upon deactivation of ADR mode, using a communication link, ensuring continuous and real-time data acquisition without the need for complex redesign of the detection unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the data acquisition unit is switched off in ADR mode to protect against electrical sparking, then vehicle safety is improved, but continuous acquisition of driver activity data deteriorates
Solution Approach 1:
The system separates the data recording function from the data transmission function. The tachograph continues to record driver activity data locally in its memory during ADR mode, while the fleet management system's data acquisition unit remains switched off for safety. This segmentation allows safety requirements to be met while preserving data continuity.
Solution Approach 2:
The tachograph pre-records driver activity data in its internal memory during ADR mode before the data acquisition unit becomes operational again. This preliminary recording ensures that no data is lost during the period when the fleet management system cannot actively acquire data, and the stored data is subsequently transmitted once ADR mode ends.
2Loss of information
If the fleet management system retrieves driver activity data from central server storage, then data availability is improved, but real-time tracking capability deteriorates due to time delays
Solution Approach 1:
The tachograph continuously pre-records driver activity data in its internal memory during ADR mode, so that when the data acquisition unit becomes operational again, the data is immediately available for transmission without requiring retrieval from central server storage. This eliminates the weekly delay associated with central server retrieval.
Solution Approach 2:
The tachograph acts as an intermediary local storage device between the driver activity and the fleet management system. Instead of relying on the fleet management system to continuously access central servers, the tachograph maintains a local copy of the data and transfers it directly to the fleet management system when conditions permit, significantly reducing retrieval time.
3Productivity
If the data acquisition unit remains active during ADR mode to maintain continuous data acquisition, then real-time tracking is improved, but electrical sparking risk deteriorates
Solution Approach 1:
The system divides the data handling functionality between two components: the tachograph (which remains active and continues recording) and the fleet management system's data acquisition unit (which is switched off during ADR mode). This segmentation allows the vehicle to maintain safety by de-energizing the fleet management system while preserving data continuity through the tachograph's local recording capability.
Data Source
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AI summary
The invention relates to a method for recording driver activity data (20) of a dangerous goods vehicle for a fleet management system (10), wherein the driver activity data (20) are recorded by a recording unit (16) of the fleet management system (10) in the dangerous goods vehicle and transmitted to a vehicle-external collection unit (12) of the fleet management system (10), and wherein a tachograph (28) is operated in the dangerous goods vehicle and a shutdown device (23) is provided for an ADR mode in which at least the recording unit (16) is switched off.The invention provides that, when the ADR mode is activated, the tachograph (28) continues to operate at least to the extent that the tachograph (28) records and stores driver activity data (20) generated during the ADR mode, and after deactivation of the ADR mode, when the recording unit (16) has restarted, the tachograph (28) transmits the driver activity data (20) stored during the activated ADR mode to the recording unit (16) via a communication link (32) depending on a trigger event (31).