dtec DYNertia3 Schnellstart-Handbuch - Seite 20

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DYNertia3 Quick Start (Inertia- Chassis type)

Assessing test results- Signal issues

If you display the same data above in 'speed' mode (kph on X axis), and not 'RPM' mode it will remove the impact on the

graph X axis scale, however the torque will still be erratic.

Below is same data above displayed in 'Speed' mode (kph is the X-axis), not 'RPM' mode. Nice power trace proves the

theory that poor TAC signal was the issue.

NOT

OK- Power traces getting very erratic as

speed rises. Mechanical issue creating variations

in shaft speed (vibrations or 'snatch'). Greater

filtering will help somewhat but not a fix.

NOT

OK- Traces go back and forth.

This can be from ignition interference etc. but the image above is

lacking any large 'spikes' that this usually creates.

Likely the engine RPM differs to roller RPM in the data so this

implies an issue i.e. roller smooth, engine erratic. This could be from

'RPM adapter' (if used) was getting bad signal (poor connection,

ignition missfire or even a rev-limiter cutting spark).

It is useful to realise the 'power' is calculated from the roller/flywheel

mass speed sensor, not the "TAC" input (RPM adapter) which is

used to derive 'torque' from the 'power' and is used for the X axis

graph scale (RPM).

Best avoid the optional TAC input use if it's not

Note:

stable or interference is impacting it, choose another

RPM source option.

NOT

from the ignition system.

www.dtec.net.au

OK- Crazy data due to electrical interference