In addition to the built-in functions for existing VehicleSim (VS) math models, advanced users can use several methods to extend the model.One option is to use third-party software such as MATLABSimulink, LabVIEW, ETASASCET, etc. to run mathematical model solver programs.Another option for this manual is to use a scripting language called VS Commands.Add variables and equations and provide advanced control over the simulation process.

Users of this article

Beginners using basic functionality do not need the information in this article to use VehicleSim products.

This article is for users who want to define scripting procedures or add equations to existing VS Math models.VS commands provide these functions.This article also shows how to use symbolic equations in an input file to calculate parameter values ​​based on the current values ​​of other parameters in VS Math Model.

Notation Conventions

A "VS Solver" is a program in a VehicleSim product (such as CarSim) that reads an input file, writes an output file and computes variables from an internal VS Math model.Although each specific VS Solver is designed to represent a different type of vehicle, they all operate the same way when reading and writing files, solving differential equations, communicating with other software, and other operations described in this manual.

A "VS Math Model" is a set of equations used internally by a particular VS solver.

"VS Browser" is the main program of the product (for example, carsim.exe) that provides the GUI and accesses the database.

When data syntax is displayed, words displayed in bold typeface represent specific text keywords or filenames; italic words represent the name of an item whose value is inIt may vary from case to case, [square brackets] indicate that the content between the brackets is optional.

1.  Symbolic E