aggregating custom gauge

[W126]

there are some gauges in Tuner Studio which aggregate values like the odometer.
Is it possible to define an aggregating custom gauge ?

[LT401Vette]

Yes...
In the Custom Configuration Editor, the advanced OutputChannel editor;
In the list of functions you will see accumulate(..) and persistentAccumulate(..)
accumulate - Accumulate and sum the expression, this allows totaling distance, milage, fuel consumption, etc. The accumulated value is only for the session.
persistentAccumulate - Same as accumulate, except the accumulated value is persisted to the next session. Allows for an Odometer.

http://www.tunerstudio.com/index.php/ma ... -functions

[W126]

I see, wonderful !
Thank you very much.

[W126]

One more question:
What is the time base for the accumulation?
In other words: which unit must the accumulated value have?
XX/sec, XX/min, XX/h ?

[LT401Vette]

The best data rate offered...
So if your current date rate is 50 reads/sec it will be 20ms

[W126]

but how does Tuner Studio know the unit of the channel?
E.g. if I want to build an odometer based on vss,
the unit might be m/s or km/h, so time reference is per second or per hour.
There must be a general time reference for accumulation, maybe per second or per minute?

[LT401Vette]

You can define the units when you define the OutputChannel.

It will accumulate the value of your expression each time...

so if you are accumulating a VSS in MPH, and the time since the last read was 25ms, you will need to do the math to determine how far you moved in that 25ms.

Example OutputChannels:
deltatime = { timeNow() - lastValue(timeNow()) }, "s"
distanceTraveledMiles = { accumulate( (vss1 / 3600) * (deltatime) ) }, "Miles"

[W126]

Aahh, that's the trick.
Thanks alot.

[W126]

works great!
Two more questions:

How do I reset the value ?
Neither "Reset Value" nor "Clear Acion" or "Reset Runtime Value" does work.

I assume aggregating only works when Tuner Studio is running ?

[LT401Vette]

Reset from the dashboard?
That should do it...

Yes, if offline there is no runtime data so nothing to aggregate.

[W126]

From the dashboard; popup-menu "Reset Value": nothing.

Setting "Single Click Action" to "Clear Action", then click from the dashboard: nothing.
Setting "Single Click Action" to "Reset Runtime Value", then click from the dashboard: nothing.

Tuner Studio 3.0.27

[WestfieldMX5]

I did a similar thing when I read this thread last week

I added an odometer (actually a tripmeter) by selecting output channel tsDistanceTraveledKilometersStored. IOW, didn't use a custom output channel, but an existing one.
To reset I used a single click - reset runtime value.
Works fine, when I click the odometer, it goes to zero.

Maybe it works because I used an existing output channel, I didn't