MapleSim

Transmission Model for ISO 26262 Compliance Testing

QTronic

In a project with QTronic, MapleSim was used to create a 6-speed transmission model for a client of QTronic’s doing ECU development. The client needed to perform ECU code testing for ISO 26262 compliance so that any issues could be addressed before the prototyping stage. The FMU from the MapleSim transmission model was integrated into the QTronic Silver platform in order to test the code for the transmission control unit (TCU). Silver was used to automatically generate test cases that searched for driving scenarios that violated the given system requirements.

The outcome was a virtual prototyping process and supporting toolchain that helps to eliminate ISO 26262 non-compliance issues in the early design stages. This has led to significant reductions in time and cost during compliance testing.

HEV Powertrain Model for HIL Testing

VI-grade and Concurrent

For a project that involved the development of HEV powertrains, Concurrent and VI-grade needed to build a full-system simulation for a driver-in-the-loop simulator. One aspect that was of critical importance was the ability to predict the thermal behavior of the battery and control the battery temperature over a range of drive-cycles and driving styles.

MapleSim was used to develop a detailed model of an HEV drivetrain which included a battery, power electronics, motor/generators and an IC engine, which was then integrated into SIMWorkbench. Within a few days, developers at Concurrent were able to provide execution benchmarks on their platform. With an execution time of 94 microseconds, the powertrain FMU was running at less than 10% of the required 1ms time budget.

The HEV powertrain model was then integrated with the full chassis model in VI-CarRealTime, which was then used to drive the vehicle simulator, providing a high-fidelity driving environment for the test driver.

5-Speed Automatic Transmission Model for HIL Testing

dSPACE

Maplesoft collaborated with dSPACE® to create a complete vehicle simulation for real-time ECU testing using the FMI standard to combine a variety of modeling environments. The FMU of a 5-speed automatic transmission model created with MapleSim was integrated with an engine model from Dymola®, and an ASM vehicle model from dSPACE, to create the full vehicle model for controls testing within SCALEXIO. Using SCALEXIO to generate different test cases that represent different operating conditions and road scenarios, ECU hardware testing was then performed.

Thanks to the level of detail in the transmission model created within MapleSim, the resulting FMU was able to achieve real-time capability, and run the simulation at full fidelity within the SCALEXIO environment. The execution time for the whole vehicle was around 300 microseconds, which was well within the 1ms time budget.

HEV Powertrain Model for Performance Optimization

IPG and Noesis

In this project, a comparative study of fuel efficiency and performance of an HEV powertrain was performed. The powertrain model was developed in MapleSim, and then integrated with the test environment using IPG CarMaker. After setting up the virtual vehicle, road and driver using CarMaker, the entire virtual environment was then linked with Optimus®, a Process Integration and Design Optimization (PIDO) platform from Noesis.

Optimus took on the task of automatically starting the CarMaker simulations, analyzing the results, and performing required optimizations. Simulations were run for an aggressive driver and a defensive driver, and the results were used to perform multi-objective optimization of the powertrain FMU to meet pre-defined performance goals. The project successfully demonstrated the workflow to generate a powertrain FMU, and integrate it into a test environment for simulation and optimization.