Braking Speed Expression

Discussion and support for i2 Standard and i2 Pro applications

Braking Speed Expression

Postby DMT1972 on Fri Dec 10, 2021 8:21 am

Can somebody assist as I am trying to create 3 channels of data as follows in the maths facility of i2 Pro to assist in braking analysis, the channels I am wishing to create are as follows:

-Front Brake speed in Bar/s
-Braking aggression
-Brake release smoothness

For brake speed my formula if correct is as follows: v_brake(t) = PBrake(t) * d/dt
Which I have as follows v_brake(t) = 'p_brake_fr' [bar] * 'Corr Dist' [m] / 'Corr Dist' [m] * ?

I am using a time/distance graph with the following channels already plotted:

G Force Long
Brake Press F
Throttle %
Vel front

It is my formula which appears incorrect as I am unsure of the value of 'dt'.
DMT1972
 
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Re: Braking Speed Expression

Postby Stephen Dean on Fri Dec 10, 2021 8:51 am

Hi,

I do not have a Brake Speed channel in my maths, but I have Brake aggression,

choose((derivative('Brake Pressure Front' [psi],0.2)>100),derivative('Brake Pressure Front' [psi]),1/0)

and Brake Release Smoothness,

choose((derivative('Brake Pressure Front' [psi],0.75)<-5),abs('Brake Pressure Front' [psi]-'Brake Smoothed Front'),1/0)*100

Brake Smoothed Front.

smooth('Brake Pressure Front' [psi],0.2)
Stephen Dean
MoTeC Research Centre Melbourne, Australia
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Stephen Dean
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