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CONTROL SYSTEM
TNV Application Manual
2-41
EGR control
The Eco-governor uses an electronic-controlled EGR valve to reduce the emission of NOx from 37 kW or
more engines.
The EGR valve is driven by a stepping motor. The opening (0 - 54 steps) of the EGR valve is adjusted
depending on the engine speed and load factor so as to control recirculation of exhaust gas.
outlines the relationship between the number of steps and the flow rate.
The EGR valve does not open when the coolant temperature is lower than 60°C. This is because low
temperature corrosion due to condensation of exhaust gas components must be prevented.
Figure 2-31
EGR valve characteristics
CSD control
The fuel injection pump (MP pump) has a CSD valve mechanism that allows the fuel injection timing to
advance and the injection quantity to increase, thereby improving the cold start performance of the engine.
The Eco-governor has a solenoid valve CSD where the CSD can be opened or closed with a valve solenoid.
The E-ECU opens the CSD valve when the coolant temperature sensor detects that the coolant temperature
is 5°C or lower at cold start. The CSD valve closes when the coolant temperature rises to 5°C or five minutes
have elapsed after engine started.
0
S
tep
54
6±1
0
m
a
x
Flow r
a
te
V
a
lve opening point
00_Electronic_Control_System.book 41 ページ 2006年5月29日 月曜日 午後2時12分
Summary of Contents for Yanmar 3TNV82A-B
Page 95: ...CONTROL SYSTEM 2 76 TNV Application Manual 00_Electronic_Control_System book 76...
Page 96: ...Appendix Standard harness 1 00_ _E fm 1...
Page 97: ...Appendix Standard harness 2 00_ _E fm 2...
Page 98: ...TNV Series service tool Operation Manual...
Page 132: ...32 7 Main Menu Figure 7 15 Data Logging Data Monitor Screen...
Page 145: ...7 Main Menu 45 Figure 7 27 System Installation Configuration Screen...