Automotive Electrical System

This example shows a simplified dynamic model of an automotive electrical system. The model contains electrical, mechanical, and thermal systems, and is able to simulate the effect of engine starting on the electrical network.

Model

Exterior Lights Subsystem

Indicators Subsystem

Starter Solenoid Subsystem

Simulation Results from Simscape Logging

The plot below shows a startup sequence for an automotive electrical network. The starter motor is turned on, which draws current from the battery in order to start the engine. As lights and other electrical loads are turned on and off, the current draw from the battery varies.

Results from Real-Time Simulation

This example has been tested on these platforms:

• Speedgoat™ Performance real-time target machine with an Intel® 3.5 GHz i7 multi-core CPU and 4 GB RAM.

• dSPACE® SCALEXIO LabBox with Intel® Core XEON E3-1275v3 at 3.5GHz and 4 GB RAM.

You can run this model in real time with a step size of 400 microseconds by using the Simscape local solver. For small sample rates, a task overrun might occur during the initial task execution due to a cold cache. To avoid this overrun, if the selected platform supports these options, relax the start-up behavior by specifying a limited number of task overruns or increasing the sample time of periodic tasks during the start-up phase of the real-time application.