Page - 39 - in Integration of Advanced Driver Assistance Systems on Full-Vehicle Level - Parametrization of an Adaptive Cruise Control System Based on Test Drives

3 Development Process The development and validation of Advanced Driver Assistance System (ADAS) are a challenging tasks, especially because it is a combination of the disciplines of elec- tric/electronics, vehicle dynamics and human factors engineering. In the automotive industry, the V-Model, adopted from software engineering, is the basis for the devel- opment of complex electronic functions, [Mau09], [Rei12]. Figure 3.1 shows the main stages of the development process. The V-Model can be divided into two parts: the left branch, where the requrirements are set and the development is done, and the right branch for the validation, [Rei12]. It is important that all the requirements must lead to a test case, which is assessed during the validation process. Therefore, the requirements have to be set clearly, [Mau09], [Rei12]. For Adaptive Cruise Control (ACC) systems, the formulation that the vehicle equipped with such a system should be able to follow another vehicle that decelerates is not sufficient. It should be added that the vehicle in front decelerates with adec, the initial conditions have to be defined (vv0,sr0,sr˙0), and evaluation criteria have to be set (e.g. the distance between the two vehicles must not fall below a defined limit of srmin). Additionally, the environmental conditions have to be set (e.g. the manoeuvre has to be carried out on a straight road with no other vehicles and no buildings near the road in clear weather). This method works properly if all of the requirements are known at the beginning of the development process, [Mau09]. With new functions or very complex systems, there will be iterations. For example, if one test cannot be passed due to the performance of an actuator, the requirements on the performance have to be adjusted, and the actuator has to be redesigned. On the component level, the process shown in fig. 3.1 is divided into the sub-processes for the components involved, [Rei12]. In the development process for an ACC system, the environmental-recognition sensors, the controller hardware and