Andreas Lapp

A process model for distributed development of networked mechatronic components in motor vehicles

Increasing demands concerning safety, economic impact, fuel consumption and comfort result in growing utilization of mechatronic components and networking of up to now widely independent systems in vehicles. The development of such a complex and networked system requires a coordinated, systematic development process. In this contribution a suitable process model is presented. It supports the verification of a domain model considering functional requirements in an early stage of development. The process model takes two different types of modeling into account. Object oriented modeling is used to describe domain models and particularly supports aspects like re-use, exchangeability, scalability and distributed development. Data flow oriented modeling especially focuses on dynamic aspects and is employed to create a simulation model. Coupling points are identified allowing an automated mapping of these two types of models.

Autosar standardised application interfaces

Mastering complexity of Electric/Electronics (E/E) architectures is one of the challenges of the automotive industry. Software sharing is an enabler to handle increasing complexity of future systems. AUTomotive Open System ARchitecture (Autosar) provides the methodology, standardised infrastructure and application interfaces for efficient software sharing. Autosar is an enabler for innovation in occupants and other road user’s safety, reduction of fuel consumption, driving comfort and fun.

Impact of driver assistance systems on future E/E architectures for commercial vehicles

New driver assistance systems on their way to automated driving are pushing the currently available E/E architectures to the limits. On the one hand, this applies to the domain and ECU topology, which will be extended by additional components, e.g., for environmental sensing, data processing, automated vehicle control and for the required surround view. On the other hand, redundant communication and system functions are necessary to ensure a “fail-degraded” or “fail-operational” system behavior. These redundancy requirements also apply to the vehicle power supply so that a redundant power supply is available to ensure that the braking system and steering system remain available even in the event of failure.

Automated risk estimation based on fault trees and fuzzy probabilites

Abstract In this contribution a safety analysis applicable in early phases of product development based on the CARTRONIC function structure and termed CARTRONC based safety analysis (CSA) is introduced. It comprises a qualitative risk evaluation to identify safety critical elements and assess the placement of safety measures as well as a quantitative approach where failure probabilities are calculated, consequences evaluated and a risk entity estimated by a rule based fuzzy methodology founded on an automatically generated fault tree from the function structure. Abstract safety measures suitable to use in early phases of product development are brought to attention which can be used for verifying safety related improvements of the function structure.

Einsatz der Max-Plus/Min-Plus Algebra zur automatisierten Sicherheitsanalyse (The Application of Max-Plus/Min-Plus Algebra for an Automated Safety Analysis)

Abstract In dem vorliegenden Artikel wird ein Verfahren zur binären Beschreibung von verteilten ereignisdiskreten Systemen vorgestellt. Dieses wird als Grundlage für eine Sicherheitsanalyse in einer frühen Phase der Systementwicklung und zur automatisierten Ermittlung von Fehlerabhängigkeiten eingesetzt. Hierzu wird eine Systemgleichung verwendet, die ähnlich zu der Zustandsraumdarstellung der konventionellen Systemtheorie ist. Dabei erfolgt die Auswertung der Systemgleichung durch Anwendung der Max-Plus/Min-Plus Algebra. Die Vorgehensweise wird anhand des Beispiels eines vereinfachten Bremssystems erläutert.