Table of Contents
Advertisement
Trends
The VHMS controller develops trends by monitoring
real-time data, and reducing the data into 20 hour
statistical values. For each trended data item, the
VHMS controller can determine the maximum value,
minimum value, and average value during the pre-
ceding 20 hour period.
Table 4 shows the type of
statistical data recorded for each item.
NOTE: Trend data is only collected when the engine
is running.
Histogram (Load Map) Data
The VHMS controller develops histograms by sam-
pling data every 100ms while the engine is running.
The data is presented as a two dimensional histo-
gram showing time-at-level for various combinations
of the two input data items.
Data Item
Engine Coolant Temperature
Engine Oil Pressure
Engine Speed
Atmospheric Pressure
Exhaust Gas Temperature
Engine Oil Temperature
Fuel Rate
Boost Pressure
Blow-by Pressure
Brake Pressure
Hoist Pressure 1
Hoist Pressure 2
Steering Pressure
Front Left Brake Oil Temperature
Front Right Brake Oil Temperature
Rear Left Brake Oil Temperature
Rear Right Brake Oil Temperature
Ambient Temperature
Hydraulic Oil (Tank) Temperature
D11-10
The VHMS controller maintains an engine speed vs.
fuel rate histogram called the Engine Load Map, and
a brake pressure vs. speed histogram.
The Engine Load Map histogram shows time-at-level
for specific engine speed and fuel rate combinations.
The Brake Pressure vs. Speed histogram shows
time-at-level for specific brake pressure and vehicle
speed combinations.
Two engine load maps are maintained in the VHMS
controller. The Permanent Load Map contains load
map data for the life of the engine. The Temporary
Load Map contains load map data since the most
recent memory clear action.
Although the engine data is sampled every 100ms
internally, the histograms are only updated every two
hours.
Table 3: Trend Data
Data Source
MAX
QUANTUM Controller
QUANTUM Controller
QUANTUM Controller
QUANTUM Controller
CENSE Controller
CENSE Controller
QUANTUM Controller
QUANTUM Controller
QUANTUM Controller
Interface Module
Interface Module
Interface Module
Interface Module
Interface Module
Interface Module
Interface Module
Interface Module
Interface Module
Interface Module
VHMS COMPONENTS
AVG
MIN
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Model
Notes
930E Only
930E Only
930E Only
930E Only
830E Only
D11005
Advertisement
Chapters
Table of Contents
