BMW IPG CarMaker-based dynamic car light function development case
BMW IPG CarMaker-based dynamic car light function development case
In order to establish a connection between Functional Mork-Up Units (FMU) and the entire vehicle, a viable vehicle model and vehicle environment must be built. The XIL integration solution integrates and validates individual system components, whether model or ECU software/hardware, and can be integrated into the entire virtual vehicle. As an open integration platform, CarMaker is well adapted to such open requirements, and the open way based on functional prototypes can be effectively implemented on such platforms. Models, software and actual vehicle components can be easily integrated on the CarMaker platform.
In the process of developing Dynamic Light Functions, the BMW Group established a virtual test environment based on the CarMaker virtual platform based on the recorded test cases and conducted a dynamic SIL test.
Figure 1 Test system structure
First, the customer is facing problems
In the open loop test, the modification of the control software can only be applied within a limited range;
• Conversion between different vehicle configuration options or the addition of new vehicle parameters is also limited in scope. In the prototype development phase, the use of the prototype is very limited, so it is impossible to carry out any tests on the prototype.
• In order to discover problems that may arise when working together between controllers, additional evaluation scenarios must be developed that must be reproduced in vehicle testing. However, the difficulty of recurring this scenario and the large number of variables in practice make such a requirement almost impossible to achieve.
Second, the solution
• Integrate different components with CarMaker, such as powertrain, auxiliary systems, control systems, instrument panels, and operating mechanisms;
• Use the virtual integration scheme to observe the impact of each component under test on the overall performance of the vehicle. At the beginning of the design, unreasonable design and even functional errors can be detected to provide guidance for design;
• Use the virtual prototype to provide input to the functional prototype unit (FMU) in the form of an entire vehicle system as shown in Figure 2. The collected signals include vehicle dynamics signals, environmental sensors, camera systems, and driver inputs (steering, manual lighting), etc.
• Use CarMaker to provide very realistic vehicle and driver models, road simulations, static and dynamic traffic objects, environmental sensors, and digital maps (such as NAVEQ, Google Earth) to enable the input of the aforementioned data;
• Establish driver operations in CarMaker based on actual road test requirements, which can be used for open or closed loop testing;
• Convert actual driving test test cases into automated tests in CarMaker TestManager.
Figure 2 CarMaker integrated platform system structure
Third, the customer benefits
• Development and testing costs are significantly reduced;
• Enable OEMs and their suppliers to use the same model for component testing and development;
Fast switching between different vehicle types through rapid modification of vehicle parameters;
Real-time modification and reuse of test cases;
• Software modifications can be implemented and verified faster in the early stages of development;
• Completed the interactive test of the virtual image under the actual camera;
Implementing the processing of camera-based information;
Implemented an interactive reaction chain test from the camera to the ECU to the actuator;
? Step by step to achieve the expansion of control points, such as the position of the lighting actuator, the brightness of the lighting mechanism;
• Verification of virtual tests by benchmarking virtual and real vehicles, avoiding unnecessary real vehicle tests.
Figure 3 Imaging comparison between virtual camera and real camera
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