Electronic Architechture and System Engineering for Integrated Safety Systems
From a technical point of view, today's safety systems have a limited degree of interdependency. To enable new safety functions, these systems need integration and combination with innovative enhanced telematic services-into a complete network of Integrated Safety Systems (ISS).
Such an integrated approach is essential to reach European Commission road safety targets. Powerful and highly dependable in-vehicle electronic architectures and the appropriate developmental support are the basis for future ISS. Its elements must be standardised to achieve an improvement in system quality with shorter development times and lower system costs. The goal of EASIS project was to define and develop the aforementioned technologies enabling the realisation of future integrated systems.
The goal of EASIS was to make technology available which includes reliable concepts for modular electrical systems. From a technical point of view, today's safety systems have a limited degree of interdependency. To enable new safety functions, these systems need integration and combination with innovative enhanced telematic services - into a complete network of integrated safety systems (ISS).
Modular scalable E/E-architecture for active, passive and integrated safety systems:
Services for communication, dependability and gateway functionality
For the realisation of Integrated Safety Systems (ISS) a powerful, highly dependable in-vehicle electronic architecture – both hardware and software – is necessary. Those elements, which are not competition-relevant for OEMs and suppliers, must be standardised to achieve an improvement in system quality with shorter development times and lower system costs. One major part of this electronic architecture is the software architecture upon which the Integrated Safety Systems shall be executed.
Embedded system safety analysis
A prerequisite for the near future introduction of Integrated Safety Systems (ISS) is the definition of a vehicle on-board electronic hardware infrastructure that supports in a cost effective manner the very high ISS application demands in terms of dependability, computational power, high speed and accurate information exchange. This infrastructure consists of a distributed electronic architecture composed by several Electronic Control Units (ECUs) with a proper internal fault tolerant design, connected by means of a complex communication system and a dependable power supply network. Such hardware architecture must support the different software layers defined in the Software Architecture.
Provision of high availability and safety
Integrated Safety Systems have demanding requirements in terms of dependability; especially regarding the dependability attributes safety, reliability, availability and security. Moreover, achieving system dependability in a predictable and assessable way is be significantly harder for integrated safety systems than for traditional safety critical vehicle subsystems. There are three reasons for this: criticality of software,complexity and responsibility. First of all, software-based components has become more safety critical than in traditional systems. The more complicated the control mechanisms of safety-critical actuators become, the less
The work under the project included:
- requirements analysis of Integrated Safety Systems;
- identification and description of failure mechanisms;
- identification and adaptation of means and methods to scope with these failures;
- definition and realisation of building blocks of hardware and software architecture insuring the realization of dependable systems;
- development of a dependability framework enabling the development engineer to realise reliable safety systems.
- A platform for software-based functionality in vehicle electronic systems has been defined, providing common services upon which future applications can be built.
- A vehicle on-board electronic hardware infrastructure, which supports the requirements of integrated safety systems in a cost effective manner has been specified.
- Methods and techniques for handling critical dependability-related parts of the development lifecycle have been analysed, adapted, extended and defined.
- An engineering process and a suitable tool chain have been defined, enabling the application of integrated safety systems.
The results have been validated by two different domain overlapping demonstrators:
- To prove the gateway and firewall capabilities of the EASIS architecture, a telematics gateway was realized.
- Overall system dependability e.g. in case of system or component failure was demonstrated by a commercial vehicle HIL testbench with an electronically controlled Intarder.