Tachograph et on-board unit for a utility vehicle

摘要

A tachograph (1) or an on-board unit for toll collection and / or for the provision of telematics services is designed to execute safety-critical program parts and safety-critical program parts. The tachograph (1) or the on-board unit comprises a hardware platform (10) with a computing unit and a memory unit. Furthermore, the tachograph (1) or the on-board unit comprises a memory management for managing the memory unit, which is executable in the arithmetic unit and is adapted to assign a protected virtual memory area to the respective program parts and to prevent the respective other program parts from being affected respective memory area read or write access. Furthermore, the tachograph (1) or the on-board unit comprises a virtualizer (25) which is executable in the computing unit and which is designed to provide independent virtual machines (30) on each of which one of the program parts can be executed in such a way, that the other parts of the program are not influenced or only influenced by predetermined interfaces.