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CONTROL SYSTEM
TNV Application Manual
2-29
General
Speed sensor input
The Eco-governor detects the engine speed with 12 pulsers attached to the camshaft. See
Assuming that the frequency of pulses provided by the pulsers is fp [Hz], the engine speed N rpm [min
-1
] is
given by
Nrpm[min
-1
]=(fp×2/12)×60=10×fp[Hz]
The engine speed fluctuates periodically due to compression and explosion strokes. As to a 4-cylinder
engine, 3 pulses represent cyclic fluctuation for one cylinder. As to a 3-cylinder engine, 4 pulses represent
cyclic fluctuation for one cylinder.
The Eco-governor averages cyclic fluctuations for one cylinder, thus minimizing the effect of cyclic
fluctuations in engine speed and ensuring stable measurement.
The E-ECU uses a counter with a resolution of 0.125
μ
s to measure the number of pulse signals. Assuming
that the measured number of pulse signals is N and the number of cylinders is C, the actual engine speed is
given as follows:
fp[Hz]=(12÷C)/N×0.125×10
-6
)
Nrpm[min
-1
]=960×10
6
/C/N
Figure 2-13
Detection of engine speed
Cr
a
nk
C
a
m
12p
u
l
s
/rev
S
peed
s
en
s
or
(m
a
gnetic type)
1/T
Nrpm[min
-1
]
(1) Nrpm[min
-1
] = 10×fp, (fp=1/T)
(2) 4 Cylinder Engine
1 Cylinder
(
3
)
3
Cylinder Engine
1 Cylinder
(4) Co
u
nter Clock(ex: 4 Cylinder Engine)
N[p
u
l
s
e]
0.125[
μ
s
]
fp=
3
/(N×0.125e
-6
)
Nrpm[min
-1
] = 240e
6
/N
12p
u
l
s
e: 4 Cylinder
12p
u
l
s
e:
3
Cylinder
00_Electronic_Control_System.book 29 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...