Tachograph External Function Module Interface
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Solution Overview
Problem
Existing digital tachographs face challenges in efficiently and cost-effectively adding new functions or upgrading existing systems due to complex certification processes and hardware upgrades, leading to lengthy and expensive procedures.
Innovation Solution
A digital tachograph with a detachable external function module that includes a secure interface for automatic recognition and adaptation of external functions, allowing for easy integration of features like GPS, payment arithmetic, mobile phone functions, and telematic functions, reducing the need for manual configuration and enhancing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If new functions are added to a digital tachograph through traditional methods (rebuilding or extensive certification), then the functionality is improved, but the time to market and cost increase significantly
Solution Approach 1:
The system is divided into a core tachograph unit and separate external function modules. Each module can be independently developed, certified, and attached to the tachograph, allowing new functions to be added without rebuilding the entire system and avoiding extensive recertification of the core unit.
Solution Approach 2:
The tachograph is designed with a universal interface (function module interface) that can accommodate multiple types of external function modules. This allows a single tachograph platform to support various functions (GPS, payment, telematics, etc.) through interchangeable modules, improving adaptability without requiring system redesign.
2Adaptability or versatility
If new functions are added through traditional rebuilding or certification processes, then the functionality is improved, but the cost increases considerably
Solution Approach 1:
By segmenting the system into modular components, each external function module can be manufactured and certified independently at lower cost. The core tachograph unit remains unchanged, avoiding the expensive recertification that would be required if the entire system were rebuilt.
Solution Approach 2:
The function module interface acts as an intermediary between the core tachograph and external functions. This standardized interface allows pre-certified modules to be integrated without requiring expensive custom integration work or extensive recertification of the core system.
3Adaptability or versatility
If hardware is over-specified for later system growth, then future adaptability is improved, but the initial cost increases
Solution Approach 1:
The system transitions from a static, over-specified hardware architecture to a dynamic, modular architecture where capabilities can be adjusted by attaching or removing external function modules. This allows the system to adapt to future needs without initially incorporating all possible functions, reducing upfront costs while maintaining growth capacity.
4Ease of manufacture
If external functions are connected through existing external connectors, then the implementation is simple, but the mechanical interface becomes the load-bearing component limiting reliability
Solution Approach 1:
The connection system is segmented into a dedicated function module interface separate from general external connectors. This dedicated interface is specifically designed to handle the mechanical and electrical loads of external function modules, providing reliable connections without overloading general-purpose connectors.
Solution Approach 2:
The function module interface replicates and adapts successful connector designs from similar applications (such as camera interfaces in vehicle data recorders). By copying proven interface designs, the system achieves both simplicity of implementation and high reliability without needing to develop a completely new connector system.
Data Source
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AI summary
The present invention relates to a digital tachograph comprising a security protected case and at least one function module interface for communication of data between the tachograph and a connected external function module. The function module comprises at least one external function. The invention introduces means for recognizing different types of external functions of a connected external function module.