Hyundai Yanmar 3TNV82A-B, Manual

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CONTROL SYSTEM
TNV Application Manual 2-35
Control map
As already mentioned in "Control software", the E-ECU software can be divided into the control program,
engine model-specific control map and individual data. This section describes the engine model-specific
control map.
Map data can be categorized into the following types:
1. Flag type: Conditionally branched based on 0, 1, 2, ...
Ex. : ON-glow control flag
0: Enables control.
1: Disables control.
2. Numeric type: Numerics are used for control.
Ex. : Alternator-pulley ratio
169: It is assumed that the alternator speed is 1.69 times the engine speed.
3. 1D type: Used to set a value in x coordinate.
(See Figure 2-23 (a) in the figure below).
4. 2D type: Used to set values in x and y coordinates.
(See Figure 2-23 (b) in the figure below).
Figure 2-23 1D/2D map and interpolation
1D and 2D maps are treated as follows:
• Values between map coordinate axes are linear interpolated.
• When there are values outside map coordinate axes, the outermost value is held. (Extrapolation)
• Decimal places are truncated.
• The number of map coordinate axes is limited to a predetermined value.
X: S peed (6 point s )
V
a
l
u
e: R
a
ck po
s
ition
( a ) 1D m a p ex a mple
X: S peed (4 point)
Y: Lo
a
d f
a
ctor (4 point
s
)
( b ) 2D m a p ex a mple
0 50
45
40
3 5 20 5
10 25
3 0
3 5
15
20
V a l u e: EGR opening
Line a r interpol a tion Extr a pol a tion Extr a pol a tion
Line a r interpol a tion
Extr a pol a tion
Extr a pol a tion
0
0
0
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