Tachograph Data Transmission Voltage Control
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Solution Overview
Problem
Conventional tachographs cannot transmit data independently of a permanent power supply, violating ADR regulations and limiting data access when the vehicle ignition is off, especially for vehicles carrying special dangerous goods.
Innovation Solution
A digital data transmission system with a data discharge unit that supplies an operating voltage to the tachograph unit during data transmission, using a switching device to control voltage supply and ensuring electrical safety, allowing data transmission even when the ignition is off without a permanent power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the tachograph is connected to a permanent supply voltage to enable data transmission when ignition is off, then data availability is improved, but electrical safety requirements under ADR regulations are violated
Solution Approach 1:
The patent implements dynamic voltage supply control where the tachograph's power supply state changes based on operational context. The system transitions from a static permanent connection to a dynamic state where voltage is supplied only when needed for data transmission, adapting the power supply configuration to satisfy both data availability and safety requirements at different times
Solution Approach 2:
The system changes the electrical parameter state by switching the voltage supply from present to absent based on transmission needs. The control unit modifies the supply voltage parameter dynamically, enabling it to be present during data transmission and absent during normal operation, thereby resolving the contradiction between continuous data availability and electrical safety
2Object-affected harmful factors
If the tachograph uses ignition-dependent voltage supply to comply with ADR regulations, then electrical safety is improved, but data transmission becomes impossible when ignition is switched off
Solution Approach 1:
The patent introduces a control unit as an intermediary between the voltage supply and the tachograph. This mediator manages the voltage supply timing, allowing the system to comply with ADR regulations during normal operation while enabling data transmission by temporarily activating voltage supply when a transmission request is received, thus bridging the gap between safety compliance and data accessibility
3Reliability
If a switching device is added to control voltage supply for data transmission, then electrical safety and data availability are improved, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions: it manages voltage supply timing, interfaces with the data transmission system, monitors transmission requests, and ensures ADR compliance. By consolidating these diverse functions into a single multi-functional component, the patent reduces overall system complexity while achieving the desired reliability improvements
Data Source
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AI summary
The digital data transmission system has a data interface (DINT) for exchange of data stored in the digital tachograph unit (TCO) and a connection (V1) for supplying a supply voltage (VB). An operating supply output (O15) is equipped to be connected with an operating supply input (I15) in the operation of the data transmission system. A data unloading unit (RDD) having a supply input (V30), is coupled with the connection. Independent claims are included for the following: (1) a digital tachograph system with a digital data transmission system; and (2) a method for operating a tachograph system in a vehicle.