SuperFlow AutoDyn, Руководство оператора

Страница: 139 / 208

Description of the Configuration File
Volume 2, Rev 2 6/28/04
Section 9 - Page 19
power readings from the system. The constant 375 comes from the
standard horsepower equation constant that uses 33,000 lbs-ft/min. By
dividing 33,000 by 5280 and then multiplying by 60, you get 375. This
converts to lbs-miles/hour, which works with the MPH value from channel
10.
Channel 44 - RWRlos HP = (C10T132)*C119/0.0763
kW = ((C10T132)*C119/1.293)*0.746
Used only on AWD
Channel 44 is used to calculate the parasitic losses inherent in the rear
rollset of the dynamometer due to aerodynamic drag. This channel uses
the roll speed, and then refers to interpolation table 132. These losses are
measured at the SuperFlow factory by motoring the dynamometer at all
speeds up to 200 miles per hour
[320 km/h] and recording the loss
information. Channel C119 adjusts the roll aerodynamic losses for air
density. The value 0.0763 is a constant relating to standard air density.
Channel 44 is combined with channels 37 and 43 in channel 42 to
calculate rear wheel power.
Channel 45 - TrqSpt ((C42*C88*C89)/C100)*100
Used only on AWD
Channel 45 is used to calculate the torque split between the front and rear
drive systems on an AWD vehicle. It uses the rear wheel power channel
42 divided by the total wheel power channel 100. That value is then
multiplied by 100 to obtain a percentage value. Channels 88 and 89 are
used as switches to enable this channel's output. The torque split value
will only be valid when using the dyno system to measure power in the
AWD mode (C88 and C89 both = 1). In all other modes, the torque split
value will be invalid and will be set to zero.
Channel 50 - CWhlPw C113
Channel 50 is a corrected wheel power channel used with previous
AutoDyn configuration files. It is made available for direct comparison with
previous saved data files. The value is the same as that displayed in
channel 113, STPPwr.
Channel 51 - TrnSlp (C125-(C52*C79*C80))/C125*100
Channel 5
1
is used to estimate the transmission slip that occurs during a
test. It takes the difference between the shaft revolutions measured by
the optical tachometer in Channel 52 and the engine speed in Channel
125. This difference is converted into a percent slip number. This channel
is useful in determining when a torque converter is locking up. The
addition of channels 85 and 87 is used to disable this channel when the
optical tach is used for measuring engine speed.
Channel 52 - ShftRv C56*C81
Channel 52 is used to determine driveshaft revolutions using the wheel
revolutions channel, C56, and multiplying by the rear differential gear
ratio.