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AutoDyn
Operators Manual
Section 8 - Page 18
Theory Of Testing.fm
A step increment in MPH is requested next. A time interval in seconds for each step point of the
test is then requested. The time interval for these tests is used to hold the vehicle at each MPH
step for a length of time prior to sampling data.
Once all parameters have been entered, the operator should select the gear for the test and
accelerate the vehicle to the starting MPH. The eddy current absorber will engage and hold the
vehicle. The test will begin automatically, holding the vehicle speed constant, sampling a data
point, then moving to the next speed setpoint determined by the speed increment size.
At the end of the test, the eddy current absorber is engaged to return the vehicle to the starting
MPH speed. Another identical test can then be performed by pressing the “NEW RUN” selection,
or the test may be stopped by pressing the “STOP” selection. When the “STOP” selection is
pressed, the eddy current absorber will engage to bring the vehicle speed to 0 MPH. If you do not
wish to return the vehicle speed to 0 MPH, simply press the big red hand (reset) function on the
handheld to end the test.
8.7.4 Road Load Simulation Tests
Road Load Simulation tests are only available on eddy current equipped dynamometers.
SuperFlow eddy current absorber equipped chassis dynamometers can perform a road load
simulation test. These tests use an estimated vehicle weight (with operator) and an estimated
frontal area in equivalent square feet to simulate load applied to the vehicle as vehicle speed
increases.
These tests can be used to perform vehicle diagnostic checks under load conditions similar to
those experienced on the road. These tests may be run in any gear and shifting during the test is
permitted. Any throttle position may be used during the test. Power is calculated from the rate of
acceleration of the dyno system inertia mass and the power absorbed by the eddy current
absorber during the test. Data recording is not determined by any preset parameters as in an
acceleration or step test. Therefore, analysis of recorded data may be more difficult to perform.
8.7.4.1 RoadLoad.tpf
This test simply records data at a predetermined rate of time (the default is every 0.1 seconds).
Once the operator starts the test, recording is enabled and the operator may operate the vehicle in
any manner desired. The eddy current absorber applies increasing amounts of load as vehicle
speed increases.
The factors influencing the amount of load are total vehicle weight (TotlWt, channel 77) and the
frontal area entered for the vehicle (FAxCd, channel 78). The test is terminated when the operator
presses “STOP” on the handheld selection. Another identical test can then be performed by
pressing the “NEW RUN” selection, or the test may be stopped by pressing the “STOP” selection.
When the “STOP” selection is pressed, the eddy current absorber will engage to bring the vehicle
speed to 0 MPH. If you do not wish to return the vehicle speed to 0 MPH, simply press the big red
hand (reset) function on the handheld to end the test.
Data is automatically recorded and saved at the end of each test run to a SFD file on the computer
disk drive.