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Vehicle Dynamics Control

The integrated chassis control of over-actuated X-by-Wire architectures (as with the ROboMObil), where the steering angle, driving and braking torque of each wheel can be individually imposed, has been an important research topic at the institute. These architectures offer unique opportunities such as high vehicle maneuverability, improved stability and optimized energy efficiency. On the other hand, they pose challenges for vehicle dynamics control such as the distribution of the actuation effort among the multitude of actuators. The motion execution layer in the scalable vehicle dynamics control architecture is developed under the requirement to address these challenges. The main goal of its core function, the so-called vehicle dynamics controller (VDC), is to distribute the control effort among the actuators (i.e. control allocation), such that the kinematic motion demand generated by the vehicle application layer is accurately realized while additional requirements such as stable operation and optimized energy efficiency are fulfilled. The VDC uses a quasi-decoupled representation of the vehicle’s lateral dynamics to independently control the vehicle’s chassis side-slip angle and yaw-rate. The transient performance has been further enhanced with the help of an inverse vehicle model. Additionally, real-time capable optimization-based approaches, seeking control allocation that minimize the energy losses and tire slips, have also been investigated. The designed VDC is implemented in the ROboMObil’s central control unit and thoroughly validated in several test campaigns carried out on multiple road surface conditions in different vehicle test tracks across Germany, under both critical and noncritical driving maneuvers. In addition, MPC combined with inverse model-based control allocation was investigated in a separate study. Models at different levels of detail for vehicle dynamics and components constitute a basis for all automotive activities. Modelica libraries in the areas of vehicle dynamics, driver models, powertrains and vehicle controls have been the focus of development over the last decades. Recent contributions address, amongst others, vertical dynamics or extensive anti-roll bar models, which can be used to simulate driving maneuvers as well as noise, vibration and harshness scenarios.

Fault Detection and Isolation


As X-by-Wire and autonomous vehicles integrate a rising number of mechatronic components and control systems into their safety critical chassis and powertrain systems, it is crucial to diagnose malfunctions to enable timely corrective actions.
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Vehicle Position Estimation


The design of high-performance state estimators for future autonomous vehicles constitutes a challenging task, due to the rising system complexity and demand for operational safety.
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Battery State of Charge Estimation


Advancement of secondary chemical energy storage technologies is one key building block in the automotive industry in order to achieve the vision for zero emission propulsion.
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Smart and Hybrid Battery Balancing


Supercapacitors with high power density and durability are particularly suited to handle rapid power bursts, while battery packs with high energy density can provide average power during vehicle cruising.
Full article

Vertical Dynamics


The suspension system of a vehicle contributes significantly to road-holding and ride comfort by providing simultaneously a sufficient tire to road contact and a good isolation of the vehicle body from road excitations.
Full article

Project EMPHYSIS: New standard „eFMI“ accelerates model-based development of embedded software


The project EMPHYSIS – initiated by Bosch and the Institute of System Dynamics and Control (SR) – had a budget of 14 million Euro and was successfully finished in February 2021. In the project the new standard eFMI (Functional Mock-Up Interface for embedded systems) was developed.
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Contact
Dr.-Ing. Jonathan Brembeck
German Aerospace Center

Institute of System Dynamics and Control
, Vehicle Systems Dynamics
Oberpfaffenhofen-Wessling

Tel.: +49 8153 28-2472

Fax: +49 8153 28-44-3883

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