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In recent days lots of effort is spent on the integration of multi-core processors also in embedded realtime systems domain for several reasons, such as continuously increasing performance requirements and stricter power limitations. This trend is reflected also in the automotive field. Another major aspect for this up-coming trend is the increasing amount of ECUs within the vehicle. Modern vehicles...
This article opens perspectives for generic modelling and real-time simulation of automotive gear transmissions containing multiple friction elements. Generic mathematical drivetrain modelling is challenging, as friction elements cause a system to vary its order and structure. Furthermore, adaptive time-step methods are not suitable for real-time simulation. Unfortunately, literature lacks flexible...
This article describes a concept for dynamic state estimation of an automotive drivetrain comprising multiple friction elements (like clutches and brakes) within gear transmissions. Adaptive time-step methods for solving model equations are unfeasible for embedded control, therefore concepts using fixed time-step methods are required. However, standard fixed step approaches may induce unwanted oscillations...
This article proposes a technique for fixed timestep state observation of automotive gear transmissions containing multiple friction elements like clutches and brakes. As adaptive time-step methods are not feasible for embedded control, the solution of model equations containing friction elements is a major challenge. The suitability of the proposed approach for a complex gear transmission comprising...
In current vehicles the actual value of engine torque is provided as interface signal to powertrain control units. For transient operation the dynamic behaviour of the combustion engine has to be estimated e.g. in the transmission control unit in order to coordinate the powertrain components. Due to the lack of provided data on the dynamic behaviour it needs to be modelled separately in each control...
Efficient coordination of actuating elements is an important challenge for modern automotive control units in order to deliver the requested torque for propulsion during all driving conditions. Model-based approaches have large potential to deal with the growing complexity. The need for real-time execution leads to fixed time step solution of the model equations. Solving model equations containing...
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