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CONTROL SYSTEM
2-30
TNV Application Manual
Rack position sensor input
The Eco-governor controls the fuel injection quantity by adjusting the rack position of the fuel injection pump.
The rack position is converted into voltage by the rack position sensor, and the voltage signal is applied to E-
ECU terminal RPS and sent to an AD converter. The AD converter converts the input voltage of 0 to 5 volt
into an AD value of 0 to 1023. See
The Eco-governor controls the maximum and minimum rack positions and calculates the load factor on the
basis of this AD value.
Figure 2-14
Detection of rack position
Coolant temperature sensor input
The input characteristics of the coolant temperature sensor are shown in
. As in the case of the
rack position sensor, the input voltage of 0 to 5 volt is converted into an AD value of 0 to 1023. As is clear
from the figure, the thermistor resistance decreases with increasing temperatures.
The measurement error of the coolant temperature sensor is approximately ±3°C at 0°C and ±6°C at 110°C.
The coolant temperature sensor has been designed so that it provides high measurement accuracy at
relatively low temperatures to allow low-temperature control of CSD etc.
The E-ECU coverts the input voltage into temperatures by mapping. Connecting a thermistor with different
characteristics to the sensor or connecting an unintended load to the thermistor circuit will affect the
relationship between input voltage and temperature, resulting in failure to perform correct temperature
measurement. Do not connect a coolant temperature sensor other than the Yanmar genuine sensor to
terminal TW (E25 - E28) of the E-ECU.
Figure 2-15
Characteristics of the coolant temperature sensor
R
a
ck po
s
ition
R
a
ck po
s
ition
Rack position
R
a
ck po
s
ition
s
en
s
or
(M
a
gnetic type)
R
a
ck po
s
ition [mm]
Volt
a
ge [V]
Volt
a
ge
Volt
a
ge [V]
AD v
a
l
u
e[AD]
0
5.0
102
3
0
5.0
M
a
p: AD v
a
l
u
e
s
us
ed
Thermi
s
tor
5.0V
1.5k
Inp
u
t volt
a
ge [V]
ECU
0
5
10
15
20
25
3
0
-
3
0
120
90
60
3
0
0
Temper
a
t
u
re [°C]
Re
s
i
s
t
a
nce [k
Ω
]
0
1
2
3
4
5
6
Volt
a
ge [V]
Thermi
s
tor re
s
i
s
t
a
nce [k
Ω
]
Inp
u
t volt
a
ge [V]
00_Electronic_Control_System.book 30 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...