Scripts for Torque and HP ?

[Mr Whippy]

I have since added to this, so I will upload what I have later tonight.

Basically, the problem now is that of low resolution speed inputs.

Take speed vs time. If you accelerate at 1mph every second, then you get a certain gradient line. If you accelerate at 1.5mph every second, then the gradient you get is actually rounded to either 1 or 2mph every second.

There lies the problem. Basically, when it rounds down between two frames, you get zero acceleration and so zero power.

This results in a jumpy output where the rounding occurs.


My solution is hardly simple or elegant, but basically I have an if statement (yet to complete) that uses the rpm's (much higher resolution input), and uses the VSS, determine the gear ratio used from that, and the back calculate a superior vehicle speed using the rpm's and gearing...

There might be nicer maths to do that, I'll have to have a look into it more as I do it...

The downside of this is that you are monitoring two PID's which is twice as slow, so the refinement of the output isn't as nice.

Dave

[phuz]

But I am showing zero now no matter what.  It doesn't jump around...it's just a constant zero. 

[phuz]

my little rendition:

var SpeedY = Obdii.GetPidValueMetric("SAE.VSS", Obdii.CurrentFrame - 1)/3.6; // Speed in m/s (one frame ago)
var SpeedZ = Obdii.GetPidValueMetric("SAE.VSS")/3.6;                         // Speed in m/s (current frame)

var TimeY = Obdii.GetPidTimeStamp("SAE.VSS", Obdii.CurrentFrame - 1);        // PID Timestamp in MS (one frame ago)
var TimeZ = Obdii.GetPidTimeStamp("SAE.VSS");                                // PID Timestamp in MS (current frame)


/* Variables for TESTING ONLY!
var SpeedY = 80/3.6;
var SpeedZ = 112/3.6;
var TimeY = 20;
var TimeZ = 25;
*/

//Input details
var Mass = 1818; // S60R mass (in kg) w/ driver & 1/2 tank fuel

var Accel = (SpeedZ - SpeedY) / (TimeZ-TimeY);
var Distance = SpeedZ * (TimeZ - TimeY);
var Power = (Mass * Accel * Distance) / (TimeZ - TimeY);
var HP = Power / 746;

Obdii.PidValue.English = HP;
Obdii.PidValue.Metric = Power;

[phuz]

And after testing this one, too, my data value still sits at ZERO.