dx({SAE.VSS.kph},2)/35.28
this formula yields a fairly jagged logged response. I suspect sampling rate may be to blame. Anyone use something more useful? Can I use the same functions that exist in Excel to dampen the response?
dx({SAE.VSS.kph},2)/35.28
this formula yields a fairly jagged logged response. I suspect sampling rate may be to blame. Anyone use something more useful? Can I use the same functions that exist in Excel to dampen the response?
Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
Custom Tuning Services
DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
EFILive's first VGT "Software Wastegate Tune"
Sampling rate is to blame.
Windshield attached g-meters use a sampling rate of 100Hz or higher.
The raw rwhp to accelerate vehicle is: m * v * dv/dt ...appropriate constants are required for making units match.
dv/dt requires a high sampling rate on v.
I am not clear on what I can use. The rate of velocity change is as good as any, don't really care about units. I am using it as a PID to evaluate constant throttle smoothness.
What is dx in the formula above? Where is "x" defined?
....and thanks for the help.
Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
Custom Tuning Services
DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
EFILive's first VGT "Software Wastegate Tune"
In EFILive, dx is shorthand for dx/dt which is the rate of change of x wrt to t (i.e. the slope of function x(t)).
In dx({SAE.VSS.kph},2) x is SAE,VSS.kph.
would some kind of trailing average smooth out the response?
I am just trying to think of how to make it useful.
Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
Custom Tuning Services
DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
EFILive's first VGT "Software Wastegate Tune"
Yes averaging would smooth out a signal.
The EFILive scantool supports this function (see page 93 of the scantool pdf):
damp()
Syntax: damp({PID},frame_count)
Arguments: {PID}: a PID name; frame_count (optional): an expression.
Return value: The average value of {PID} from the current frame-frame_count to the current frame.
You might go like this: damp({SAE.VSS.kph},8) or damp({GM.TP},16)
very nice. I will give this a try.
Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
Custom Tuning Services
DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
EFILive's first VGT "Software Wastegate Tune"