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Chapter 16: Load Controllers
Ramp testing load control
Ramp Load Control: Enable ‘Ramp’ testing. You can allow the dyno to
perform a ‘Ramp’ test by gradually allowing the RPM/speed to increase in a
manner determined by the ‘Time line’ profile.
Ramp Mode Editor: Opens the ‘Ramp Editor’ Window below for adjusting
the settings associated with ‘Ramp’ testing.
We call the values to give the desired ramp rate a “Time Line”. By default the test will
start recording after the ‘Start Delay’ (gives time to stabilise) and stop at the ‘Ramp End’
RPM/speed.
Note: Ramp testing on chassis dyno should be done in
‘Speed’ mode (kph/sec) as ‘RPM’ mode requires the drive
ratio to be set and not alter (as it will with gear shifts or
torque convertor slip) i.e. the system precisely controls the
roller RPM, so for RPM ramps the software must first
convert a target engine RPM into a roller RPM using a
drive ratio, this can be inaccurate.
Tip- There is a small ‘Start Offset’ applied to the test
start RPM/speed to allow the control functions to stabilise
and reduce the effect of any system oscillations (from PID
settings). This is automatically selected, but you can
choose your own in the menu “Setup/Software/System”.
Saving and Loading Timelines: You can save the Time Line settings if you wish (or load already
saved ones) by using the ‘disc’ buttons.
After the ‘Ramp Editor’ is closed the Load Control window will now display the selected ramp as a preview.
Press the “RAMP START” button and DYNertia3 will start waiting for the test to start.
Accelerate the engine until the start RPM is reached; it will then follow the ramp automatically and end the test when the
end RPM is reached.
Tip- During the test the progress is best viewed on the “Graph” Window displayed on a second monitor.
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