PARKING ASSIST TESTING THE MEASURABLE DIFFERENCE. > Creation of complex 2-dimensional objects > Online distance calculations between moving and stationary objects > Creation of Automatic Points of Interest > IMU data acquisition > Proving ground visualization FURTHER INFORMATION? Visit us on www.dewetron.com! * ' THE CHALLENGE To increase the driving comfort of the passengers and reduce the accident potential during parking scenarios, OEM and TIER1s have developed Advanced Driver Assistant Systems that support the driver during the parking process. In the past years, different parking assist features have been developed that provide different kinds of feedback to the driver. Figure 1 SOME EXAMPLES ARE: > Acoustical feedback in the form of a beep with increasing urgency with decreasing distance to an obstacle > Optical feedback that visualizes the distance to obstacles via graphics (see Figure 1) > Optical feedback from a rear view camera including the overlay of the extrapolated driveway (see Figure 2) Figure 2 1
> Optical feedback from multiple cameras surrounding the car. The images are projected to a graphics that represents the shape of the car and shows the environment surrounding the car (see Figure 3) Figure 3 > Autonomous Driver Support by adjusting the steering angle automatically according to the individual parking lot and providing the driver recommendations when to accelerate and to brake > Autonomous Parking System that steers, accelerates and brakes without interaction from the driver until the car is situated in the parking lot By their nature both Autonomous Driver Support systems and Autonomous Parking systems need to be evaluated and tested accurately during the development process to ensure maximum safety and accuracy. Rigorous testing during development will ultimately protect the driver from accidents, avoid damage to the surrounding environment and to the VUT (Vehicle Under Test) itself in the real-life application. To support test engineers during the testing and development phase of such parking systems, DEWETRON s OXYGEN Automotive Plugin is the intuitive, flexible and versatile measurement solution for these critical tests. Required Data > GPS position of the parking lot > Dimensions of the parking lot > GPS position of the VUT > Shape of the VUT 2
Data acquired and calculated during the test > Velocity, Heading and GPS position of the VUT > Distance between VUT and parking lot limitations > Distance between VUT and potential adjacent vehicles or objects EQUIPMENT > DEWETRON Hardware (see Figure 4) > DEWE2-A4 or DEWE2-M4 Data Acquisition system for mobile applications > DEWETRON Software (see Figure 5) > OXYGEN Data Acquisition & Analysis Software > OXYGEN ADMA Plugin for data acquisition of a GeneSys ADMA via Ethernet > OXYGEN Automotive Plugin for proving ground visualization and distance calculations between moving and stationary objects. Includes the shape editor create complex 2-dimensional shapes (e.g. the vehicle silhoue e). > GeneSys Hardware > ADMA-SPEED Inertial measurement unit; Up to 0.01m position accuracy > GPS Outdoor Base Station for DGPS correction data provision Figure 4 Figure 5 THE APPLICATION SOLUTION The Shape Editor DEWETRONs Shape Editor is the ideal tool to import the silhoue e of a VUT into the software and assigns multiple predefined EURO NCAP/USA National Highway Traffic Safety Administration POIs automatically. In addition, user-defined POIs can be assigned to any position of the vehicle silhoue e (see Figure 6). Figure 6 3
Proving ground visualization The proving ground can be visualized within OXYGEN DAQ software by just importing a satellite image of the proving ground. The GPS alignment is done with two reference points visible on the image for which the GPS coordinates are known. Creation of multiple moving and stationary objects The OXYGEN Automotive plugin allows the test engineer to create multiple moving and stationary objects to mark the parking lot within the software (see Figure 7) and to represent the VUT (see Figure 8) (whose contour was previously) created with the Shape Editor and its corresponding POIs. The coordinates of the parking lot can be imported intuitively with the Locator object feature that allows the engineer to copy and paste the actual positions of a GPS antenna to any other object. Figure 7 Figure 8 ADMA Plugin for OXYGEN The VUT is equipped with a GeneSys IMU, i.e. the ADMA-SPEED, to receive its absolute position. Latitude, Longitude and Heading information can be assigned to the VUT object in OXYGEN to update the VUT position and track the movement. By receiving RTK data from a GPS Base Station, the position accuracy is 0.01m. The ADMA Plugin for OXYGEN allows the test engineer to acquire up to 6 ADMA data streams simultaneously over Ethernet. ADMA data streams are synchronized as they are clocked by the GPS time received by the ADMA. Calculation of relative distance between all objects and their POIs in > Longitudinal direction > Lateral direction > Vectoral direction 4
Multiple distance calculations can be added with a few mouse clicks and are always updated online. The minimum distance between a VUT and another object can be calculated by assessing the entire VUT contour instead of a dedicated POI. By visualizing all involved objects on the proving ground image, the test engineer has the ideal feedback for interpreting the measurement results during the test and while analyzing the data (see Figure 9). In addition, he can always check the data for plausibility. Figure 9 ADDITIONAL BENEFITS Any additional sensor data can be acquired during the test as well. DEWETRON provides a wide range of signal conditioning modules that can be mounted into a DEWE2-A/M-4 or any other measurement chassis. Regardless if the information is analog or digital sensor data, CAN data or even video data, all can be acquired completely time synchronously in parallel and stored to the same data file to ensure one single point of truth. The synchronization of all data streams is ensured by clocking the DEWE2-A/M-4 by the PPS pulse which is provided by the ADMA and generated out of the GPS time received by the ADMA. OXYGEN provides a powerful math module to perform online signal processing. Mathematical operations, statistical calculations, Signal Filtering and Spectral Signal Analysis can be added with a few clicks and are updated online. In addition, the data can be exported to different file formats to provide an interface to 3 rd party software packages for dedicated and automated user-defined data post-processing. THE EXPERT RAFAEL LUDWIG Dipl.-Ing. Rafael LUDWIG BSc studied electrical engineering and audio engineering at the University of Music and Performing Arts Graz and the Graz University of Technology. During his master studies he specialized on acoustics and audio recording. After graduating, he worked as acoustics engineer in the R&D department of a mechanical engineering company before he joined DEWETRON in 2017. At DEWETRON, he is Application Engineer for Automotive, E-Mobility and Power applications and General Test and Measurement solutions. FURTHER QUESTIONS? CONTACT THE AUTHOR: rafael.ludwig@dewetron.com 5