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Description of the Configuration File
Volume 2, Rev 2 6/28/04
Section 9 - Page 27
Channel 123 - RolRPM C10*5280/60/42/3.1416*12
C10*1000/60/50.4/3.1416*100
Channel 123 is used to calculate the roll rpm during a test. It determines
the roll rpm from the roll speed from Channel 10 by calculating the
circumference of the roll and dividing it into the distance traveled per
revolution at that speed.
Channel 125 - EngSpd
(C85*(C11+C9)/C83*60)+((C86*C59)+(C87*C58)*C94)
Channel 125 is used to calculate the engine speed. It uses several
methods to do this, determined by the settings of channels 85, 86, and
87. Whichever one of those channels is set to a value of 1 (with the other
two set to a zero) will determine which calculation to be used. The first
portion uses the frequency input from Channel 11, the ignition pickup or
Channel 9, the tachometer direct input, divided by the pulses per
revolution of the engine, Channel 83. These are multiplied by 60 to
convert the pulses per second to pulses per minute for RPM. Channel 83
can also be used as a factor if you are using the direct tachwire pickup.
The second portion of the equation uses the frequency from the optical
tach pickup, channel 9, along with a ratio of the rotating device to the
engine's rotation. The optical tach could be used on any rotating device
on the engine and the ratio should then be the ratio of that device to the
engine. The third portion of the equation simply calculates engine speed
in a specific transmission gear ratio as a function of roll speed. It requires
no specific pickups.
Channel 126 - AbsPwr
2WD and
AD-11
systems
HP = C3*C123/5252.113
kW = C3*C123/9549
Channel 126 is used to calculate the power absorbed by the eddy current
power absorber. It uses the power absorber torque (in absolute value)
from Channel 3 times the roll RPM from Channel 123, and divides by a
constant to determine the power absorbed. This value is combined with
channels 108 and 105 in channel 100 to calculate wheel power. When the
eddy current absorber is loaded during a test, this channel will contribute
a larger portion to the wheel power calculation in channel 100.
AWD systems
(C41*C88) + (C37*C89)
For AWD systems, the front absorber power, channel 41, and rear
absorber power, channel 37, are simply added together to provide total
absorber power. Channels 88 and 89 are used as switches for selecting
the wheel power measurement mode on the AWD system. This value is
combined with channels 108 and 105 in channel 100 to calculate wheel
power.