Electromotive xdi, Руководство по установке и инструкция пользователя

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XDI Manual Version 1.8 Page 27

2017 Electromotive, Inc.
Input Voltage vs. Additional Retard
0
5
10
15
20
25
30
35
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6 2.8
3
3.2 3.4 3.6 3.8
4
4.2 4.4 4.6 4.8
5
External Voltage Applied at Pin 13 (Orange)
A
d
d
it
io
n
a
l
R
e
ta
rd
(
D
e
g
re
e
s
)
Figure 18
- Graph of input voltage vs. addional retard
5.5.a Backup Sensor
In the situation where a backup crank trigger sensor is required, the external retard control line can be
used. When 5V is applied to this input, the system retards the whole advance curve by 30 degrees (5 teeth on
the trigger wheel). By locating a backup sensor 5 teeth ahead (advanced) of the normal sensor, a switch can be
used to change crank trigger sensors and signal the Retard input to adjust the timing.
Figure 19 shows the
location of the backup sensor. The example shown is for clockwise configurations except 12 cylinder.
5.6 Tachometer Output
The tachometer output on pin 18 (brown wire) of the XDI is a +12 Volt square wave. The tachometer
output signal will rise from ground to +12V at each cylinder’s TDC event. The pulse will remain at 12V for
30

of crankshaft rotation. There are two situations where the number of tach pulses does not match the number
of TDC events. This is commonly used for engines that used two distributors from the manufacturer. The
number of tach pulses per configuration is listed in
Table 8 .
Figure 19
–
Backup sensor location