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ME-Mobil - Model EHLA FAILOP -Fail-Operational Auxiliary Steering System
Electronic hydraulic vehicle steering system with permanent maintained steering. Vehicles with a big influence of the rear axle steering position on the vehicle direction often demand for an active steering throughout the entire speed range.
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Moreover, a common safety strategy with a passive failsafe mode is not sufficiant in many applications. EHLA® FAILOP provides highest availability by offering an entirely redundant architecture and is the solution for long-framed mobile cranes or multi-articulated buses.
EHLA® FAILOP is often combined with fail-safe systems or AGV applications. It offers the complete function range known from the fail-safe systems.
Fail-operational Auxiliary Steering System for the Van Hool Exquicity
- One of the most challenging applications in the range ofauxiliary steering systemsis thearticulated bus. Common fail-safe systems are limited for these vehicles. The risk analysis leads to a requirement for aSIL3 system(IEC61508) and the vehicle design does not allow any shut-down or centring measure in the case of a system failure as the driving behaviour of the trailer is massively affected or even a mechanic defect of the articulation may be provoked. Conclusively afail-operationalsystem is required.
- MOBIL ELEKTRONIK has been working for more than 10 years in this field. This experience was transferred to the sophisticatedVan Hool Exquicity. Besides the steering system the demand lies in the extensioussystem integrationresulting from the hybrid drive chain. The system has been successfully approved from the TÜV Nord accordingECE-R79 annex 6.