Vehicles

Main Page > Technical Documentation > Vehicle Movement Logic > Desired Speed

Vehicles Any number of different vehicles can be included in the simulation. By default, the following vehicles are included: Because of the detailed vehicle dynamics and fuel consumption/emissions modeling employed in SwashSim (discussed later in this section), numerous vehicle characteristics must be specified for each vehicle included in the simulation. An overview of these inputs follows.
 * 2006 Honda Civic Si
 * 2005 Mazda 6
 * 2008 Chevrolet Impala LS
 * 2004 Pontiac Grand Am GT
 * 2001 Volvo S40
 * 2009 Honda Civic
 * 1998 Buick Century
 * 2002 Chevrolet Silverado
 * 2011 Ford F150
 * 1998 Chevrolet S10
 * 2004 Chevrolet Tahoe
 * Single-unit truck
 * Intermediate tractor + semi-trailer
 * Interstate tractor + semi-trailer
 * Tractor + double trailer

Base Info The base vehicle information includes: The default values can be changed under ‘Settings &#8594; Vehicles &#8594; Base Info’, as shown below. You can add or remove a vehicle by clicking on the green ‘+’ or delete a vehicle by clicking on the red ‘X’. Clicking ‘Save Changes to Memory’ will save any changes to the settings for your current simulation session, but they will be lost after closing the program. To save changes permanently to the vehicle database, click ‘Save Values to File’.
 * Vehicle name
 * Vehicle ID
 * Fleet type (small auto, large auto, small truck, large truck)
 * FHWA classification
 * Maximum deceleration
 * Desired speed proportion. This value is an additional multiplier for a vehicle’s desired speed.
 * Length, width, and height
 * Weight
 * Wheel radius
 * Drag coefficient
 * Engine ID
 * Transmission ID
 * Minimum driver type
 * Maximum driver type

Engines Each vehicle needs to have engine characteristics specified for it. The engine information includes: The engine values can be specified under ‘Settings &#8594; Vehicles &#8594; Engines’, as shown below.
 * Engine label
 * Engine ID
 * Displacement
 * Strokes/cycle
 * Volumetric efficiency
 * Engine idle speed
 * Maximum engine speed

For each engine, a torque-engine speed relationship must also be specified. This input screen is accessed by pressing the ‘Torque Data’ button in the engine settings window, which will open a window as shown below.

Transmissions Each vehicle also needs to have transmission characteristics specified for it. The transmission information includes: The transmission values can be specified under ‘Settings &#8594; Vehicles &#8594; Transmissions’, as shown below.
 * Transmission label
 * Transmission ID
 * Drive axle slippage
 * Drivetrain efficiency
 * Differential gear ratio
 * Transmission gearing information, which includes:
 * Gear number
 * Gear ratio
 * Downshift speed
 * Upshift speed