Advanced Driver Assistance Systems - ADAS
The automotive industry meets the requirement for making traffic and vehicles safer and for minimising the risk of accidents through increased use of advanced driver assistance systems, active safety systems, and even automated driving functions. Since modern assistance systems increasingly intervene in the driving process during vehicle operation, they now need to be verifiable and assessable as early as the development stage and take account of the interaction between driver and vehicle.
Particularly in critical driving situations, e.g. when at risk of collision, where modern assistance functions have a significant impact on the driver’s reactions, the systems involved represent an important area of investigation.
Driving simulators – status quo
The success of a vehicle is largely dependent on the subjective driving experience. This must meet the customer’s expectations of the vehicle, although it must not negatively affect other vehicle characteristics, such as fuel consumption and safety. To facilitate subjective evaluation of the driving experience during vehicle development, it is absolutely essential to conduct road tests. At the same time, it must be possible to perform subjective evaluations at an early stage in the development cycle, before the first prototypes are built.
With progressive virtualisation of the development processes and increasing cost pressure, prototype vehicles are becoming available ever later and in ever decreasing quantities.
Consequently, it is becoming ever more essential to evaluate the virtualised vehicle with the help of a vehicle simulator. At the same time, the vehicle simulator must be capable of simulating all the driving situations required for a subjective evaluation.
To meet these demands, a next-generation driving simulator is required with the following properties:
The simulator provides a realistic, highly immersive driving experience. Even special driving scenarios, such as tight corners, braking, emergency cases and accident situations are simulated realistically and sufficiently dynamically. The interior of the enclosed simulator housing provides a complete simulation environment with customisable vehicle interior, cockpit and virtual outside view.
To abolish the restrictions in the motion envelope and driving dynamics of existing driving simulators, the idea of a freely mobile simulator has been adopted and further refined.
In contrast to conventional driving simulators, this simulator is designed quite literally as an “automobile” test vehicle that can move freely around a limited, level area, in a hall or open space. Plane motion of the driving simulator on a driving surface is achieved with the help of multiple, electrically driven, steerable wheel pairs.
Appropriate alignment of the simulator and the vehicle mock-up mounted thereon makes it possible to simulate longitudinal and lateral accelerations acting on the driver as well as yawing.
The pitching, rolling and lifting movements to be imparted on the driver are generated by actuators underneath the vehicle mock-up.
The result is realistic reproduction of the dynamic driving behaviour of a road vehicle, especially the longitudinal and lateral dynamics, as well as rolling, pitching, yawing and lifting movements. Sustained longitudinal and lateral accelerations can be simulated in a manner equivalent to that of cornering in a real road vehicle, particularly through the centripetal acceleration generated by driving in trajectories.
In contrast to existing systems, this driving simulator enables active, significantly more detailed, dynamically adequate simulation of real driving conditions and trajectories.
Irrespective of the vehicle dynamics prescribed by the driver via the vehicle simulation model and the movements actually implemented by the motion filter, use of active and passive safety functions ensures reliable, stable driving behaviour within the defined, limited driving area.
Alongside active safety functions for automatic control of simulator movements within the driving area, the safety system also includes functions for controlled deactivation of the simulator at the edge of the driving area (hall or outdoor area).
A special emergency braking system ensures that the vehicle is shut down in dangerous and emergency situations without any risk of injury for the driver.
Characteristics and benefits
Unrestricted mobility within a large driving area is the only way to simulate accelerations realistically over the entire dynamic range.
Special chassis and parallel kinematics, free yawing of the simulator dome relative to the carrier platform, in conjunction with the high demands made of the immersive outside view allow a previously unattained quality of representation as well as new options for preventing simulator and motion sickness.
Exchangeable systems for different vehicle cockpits, display instruments and control components, plus HiL and SiL interfaces for assistance systems guarantee comprehensive configurability in line with demanding customer requirements.
The joint project synergises the vehicle engineering expertise of the Faculty of Automotive Technology at TU Dresden with that of AMST – Systemtechnik GmbH as a simulator manufacturer.
It can be operated both in a simulator hall and on a level outdoor area. It is also transportable..
The simulator provides the capabilities for early verification and evaluation of assistance systems and human-technology interaction. It can be employed in
Whether it be test drivers, standard drivers or disabled drivers, the simulator is equipped for all users possessing a driving licence.
The entire simulation and testing system is characterised by economy of use, maximum safety and flexibility of application, as well as environmental compatibility.