Hyundai Yanmar TNV Series Manual page 54

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).
Extrapolation
X: Speed (6 points)
(a) 1D map example
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.
TNV Application Manual
Linear interpolation Extrapolation
Figure 2-23 1D/2D map and interpolation
CONTROL SYSTEM
Value: EGR opening
Extrapolation
0 20
0 15
Linear interpolation
0 10
0 5
X: Speed (4 point)
(b) 2D map example
35 50
30 45
25 40
20 35
Extrapolation
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