Hyundai Yanmar TNV Series Manual page 73

CONTROL SYSTEM
Idling speed up
The feature allows the low idling speed to increase gradually until the coolant reaches a specified
temperature, helping the engine warm up quickly. See the figure below. See Figure 2-46. By default, the
"idling speed up" feature is disabled.
automatically
Figure 2-47 shows the standard idling up settings and coolant temperatures. The settings can be changed.
(Optional)
600
500
400
300
200
100
0
Blue and white smoke suppression
The feature allows the high idling speed to be limited when the coolant is lower than a prescribed
temperature, thus reducing the time required for vanishing the emission of blue and white smoke in cold start
conditions. See Figure 2-48. By default, the "blue and white smoke suppression" feature is disabled.
The blue and white smoke suppression feature is available as an option for engines with a rated rpm of 2300
-1
min or higher. When this feature is enabled, the high idling speed at a coolant temperature of 5°C or lower
decreases by approx. 100 - 200 min
2-54
usual low idle speed
accelerator position
Figure 2-46 Idling speed up in cold conditions
-30 -20 -10
Figure 2-47 Idling up settings
usual high idle speed
manually manually
accelerator position
Figure 2-48 High idling speed limitation in cold conditions
-1
.
0 10 20
Coolant temperature [°C]
TNV Application Manual
shorten warm up
coolant temperature
30 40 50
smoke control
coolant temperature