Real-Time Powertrain Module for Vehicle Simulation

摘要

A two state, engine speed and wheel speed, powertrain model is developed with bondgraph theory and coded in the C programming language for real-time simulation and comparison to the same model implemented in the MATLAB Simulink/Stateflow environment. Both throttle and braking are inputs with adjustable engine, transmission, and vehicle parameters. The structure of the model implementation provides for decoupled transmission and driveline modules for modularity. Gear shifting is accomplished with a shift delay of 0.8 seconds. A fixed step Runge-Kutta integration scheme is used with a time step of 0.01 seconds. Two throttle input cases are compared for each model with the results being essentially the same for each case - peak differences are attributed to signal shift on transition edges. Simulation time for each case was 200 seconds and was achieved within 5 seconds real-time. This is a 40:1 simulation time to real-time ratio.