PROFESSIONAL MOTORSPORT

SIMULATION SOFTWARE

First step in optimizing your driving line

Printscreen of the LapSim GUI showing an complete track layout in combination with driving line of the zoomed area

With the implementation of the loading routine for the AIM *.xrk datafiles, the driving line is determined out of GPS data.

This opened new possibilities for comparing and analysing driving lines out of the on-car recorded data.

The structure created to properly analyse the GPS based driving lines, determine the first major step in optimizing driving lines.

Distance corrected data traces

Printscreen of the LapSim GUI showing plot results with distance corrected traces

Next to comparing driving lines, GPS based data gives the possibility to calculate a distance correction along the complete track. This makes the diff time calculation much more realistic as well as the comparability of all the other data traces.

The "diff distance" trace can be seen together with the diff time trace on the bottom plot.

In the example two corners are highlighted where there is a significant difference in the driving line, creating a significant difference in driving distance.

Automatically generated elevation points

Printscreen of the LapSim GUI showing a plots with data traces in combination with diff distance signal

Due to the GPS, the driving line elevation is available. However, it is not really in a LapSim sustainable format. LapSim assumes a certain amount of key elevation points, not a point every 2 - 5 [m].

We developed an algorithm to reduce the vast amount of point to 'key' elevation points.

By comparing several laps, you will notice the limited accuracy of the elevation points. Which gives another reason to limit the amount of them.

Option to select multiple laps using "Ctrl" button

In order to improve LapSim's functionality as a data analysis tool, the possibility to load multiple laps at once has been created.

Printscreen of the LapSim on-car loading GUI showing a selection of multiple laps

If you click in the listbox with the "Ctrl" button engaged, you will add this lap to the already "Selected Laps" to be loaded.

Selecting an already selected lap with "Ctrl" button engaged, will delete this lap from the selected list. Selecting a lap without "Ctrl" engaged, will delete all selected files and will only select the lap in the listbox.

Addition plot appears when zooming into detailed area

Printscreen of the LapSim GUI showing an complete track layout in combination with driving line of the zoomed area

When LapSim distinguishes AiM data in the workspace, it will create an extra enlarged plot of the driving lines of the zoomed area.

The complete track layout moves to the top and on the bottom right the addition zoomed area of the driving lines are shown.

Printscreen of the LapSim GUI showing an complete track layout in combination with driving line of the zoomed area

Zoom functionality

Functionality is like in the normal plots, with the exception that when moving the zoomed area in the complete trackmap (left mouse button engaged), the bottom zoomed area of the track is continuously being updated.

In the figure on the right, you see an example of such an action for three corners where the driving line significantly differs.

Printscreen of the LapSim GUI showing an complete track layout in combination with driving line of the zoomed area

Moving the mouse in the zoomed track layout with either button engaged, will move the current point with the distance between the two driving lines continuously being updated.

In the zoomed driving line plot, a square of 20 x 20 meters is shown, to give feedback if the correction for the GUI window ratio is correct.

Using the simulation model to judge the fastest line

Apart from analysing the driving line in the on-car recorded data, LapSim offers the possibility evaluate the driving lines from a simulation point of view.

Printscreen of the LapSim workspace with 4 four on-car recorded laps and 4 respective simulation laps on their driving lines

In the figure on the right you see an overview of a LapSim workspace with 4 laps of one outing of on-car recorded data. In addition there are 4 simulation laps based on the driving lines of these 4 laps, using the same vehicle. Hereby giving an evaluation of the different driving lines.

In this example the fastest simulated laptime is achieved with the driving line of the second slowest lap.

Fastest laptime versus fastest driving line

In the figure on the right, the diff time and diff distance traces are shown for the 4 simulated laps.

Evaluation of the driving lines of 4 on-car recorded laps

It can be seen that the driving line of the fastest simulated lap has the shortest distance.

The simulation model driving the line of the fastest real lap, loses in the first corner and most significantly in the chicane. In all the other corners, the driving line is of the fastest real lap is equal or better.

Combining the driving line in the several corners of the individual laps, would most probably lead to a laptime improvement of about 0.5 [sec].