<s>
SECU-3	B-Device
is	O
an	O
internal	O
combustion	O
engine	O
control	B-General_Concept
unit	I-General_Concept
.	O
</s>
<s>
It	O
is	O
being	O
developed	O
as	O
an	O
open	B-License
source	I-License
project	O
(	O
drawings	O
,	O
schematic	B-Application
diagrams	I-Application
,	O
source	O
code	O
etc	O
.	O
</s>
<s>
SECU-3	B-Device
system	O
controls	O
the	O
ignition	O
,	O
fuel	O
injection	O
and	O
various	O
other	O
actuators	O
of	O
the	O
internal	O
combustion	O
engine	O
(	O
ICE	O
)	O
and	O
vehicle	O
.	O
</s>
<s>
SECU-3	B-Device
manages	O
AFR	O
on	O
the	O
carburetor	O
engines	O
(	O
similar	O
to	O
AXTEC	O
AFR	O
systems	O
)	O
,	O
idle	O
cut-off	O
valve	O
and	O
wide	O
open	O
throttle	O
mode	O
valve	O
in	O
carburetor	O
systems	O
,	O
controls	O
electric	O
fuel	O
pump	O
and	O
gas	O
valves	O
in	O
closed	O
loop	O
mode	O
according	O
to	O
the	O
feedback	O
from	O
the	O
oxygen	O
sensor	O
.	O
</s>
<s>
The	O
SECU-3	B-Device
system	O
provides	O
unique	O
opportunities	O
for	O
reassigning	O
the	O
I/O	O
pins	O
of	O
the	O
mainboard	O
for	O
custom	O
uses	O
in	O
engine	O
tuning	O
.	O
</s>
<s>
SECU-3	B-Device
system	O
has	O
many	O
other	O
advanced	O
features	O
(	O
listed	O
below	O
)	O
.	O
</s>
<s>
SECU-3	B-Device
.	O
</s>
<s>
SECU-3	B-Device
Micro	O
.	O
</s>
<s>
It	O
is	O
the	O
simplest	O
SECU-3	B-Device
unit	O
.	O
</s>
<s>
)	O
,	O
with	O
extended	O
number	O
of	O
I/O	O
and	O
Bluetooth	B-Protocol
connectivity	O
.	O
</s>
<s>
The	O
device	O
is	O
developed	O
using	O
the	O
8-bit	O
AVR	B-Architecture
microcontroller	I-Architecture
ATMega644	O
,	O
with	O
64kB	O
memory	O
(	O
ROM	B-Device
)	O
,	O
4kB	O
random	O
access	O
memory	O
(	O
RAM	O
)	O
,	O
and	O
operates	O
at	O
a	O
clock	O
frequency	O
of	O
20MHz	O
.	O
</s>
<s>
It	O
includes	O
analog	O
and	O
digital	O
inputs	O
,	O
separate	O
chip	O
for	O
preprocessing	O
signal	O
from	O
the	O
knock	O
sensor	O
(	O
KS	O
)	O
(	O
except	O
SECU-3	B-Device
'	O
Lite	O
 '	O
and	O
'	O
Micro	O
 '	O
units	O
)	O
,	O
a	O
signal	O
conditioner	O
for	O
VR	O
start-pulse	O
sensor	O
(	O
except	O
SECU-3	B-Device
Micro	O
unit	O
)	O
,	O
a	O
signal	O
conditioner	O
for	O
the	O
VR	O
crankshaft	B-Algorithm
position	I-Algorithm
sensor	I-Algorithm
(	O
CKP	O
)	O
,	O
the	O
interface	O
with	O
a	O
computer	O
,	O
and	O
the	O
outputs	O
for	O
actuators	O
control	O
.	O
</s>
<s>
Structural	O
diagram	O
of	O
the	O
system	O
with	O
SECU-3	B-Device
Micro	O
unit	O
:	O
</s>
<s>
It	O
is	O
done	O
in	O
the	O
SECU-3	B-Device
Manager	O
software	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
SECU-3	B-Device
was	O
launched	O
in	O
October	O
2007	O
and	O
successfully	O
works	O
on	O
the	O
author	O
's	O
(	O
)	O
vehicle	O
for	O
now	O
.	O
</s>
<s>
The	O
system	O
has	O
evolved	O
from	O
the	O
ignition	O
control	O
to	O
the	O
engine	O
management	O
system	O
(	O
ECU	B-Device
)	O
.	O
</s>
<s>
GPL	B-License
,	O
with	O
one	O
addition	O
:	O
developments	O
can	O
not	O
be	O
used	O
in	O
commercial	O
purposes	O
without	O
written	O
approval	O
of	O
author	O
(	O
according	O
to	O
information	O
from	O
)	O
.	O
</s>
<s>
Synchronization	O
from	O
CKP	B-Algorithm
sensor	I-Algorithm
and	O
missing	O
tooth	O
wheel	O
or	O
from	O
two	O
sensors	O
and	O
non-missing	O
tooth	O
wheel	O
.	O
</s>
<s>
SECU-3	B-Device
SECU-3T	O
SECU-3T	O
revC	O
and	O
later	O
SECU-3L	O
(	O
Lite	O
)	O
SECU-3	B-Device
Micro	O
SECU-3i	O
Date	O
2007	O
2012	O
2014	O
2015	O
2016	O
2016	O
MCU	O
ATmega16	O
,	O
ATMega32	O
ATMega32	O
ATMega644	O
ATMega644	O
ATMega644	O
ATMega644	O
Features	O
Wasted	O
spark	O
,	O
synchronization	O
from	O
CKP	B-Algorithm
sensor	I-Algorithm
full-sequential	O
ignition	O
,	O
</s>
<s>
synchronization	O
from	O
Hall	O
sensor	O
,	O
CKP	B-Algorithm
sensor	I-Algorithm
,	O
CKP	O
+	O
reference	O
sensor	O
,	O
</s>
<s>
optional	O
embedded	O
bluetooth	B-Protocol
same	O
,	O
plus	O
fuel	O
injection	O
control	O
,	O
</s>
<s>
Simplified	O
installation	O
and	O
wiring.The	O
most	O
functional	O
version	O
among	O
SECU-3	B-Device
units	O
,	O
a	O
full	O
EMS	O
.	O
</s>
<s>
The	O
unit	O
consists	O
of	O
two	O
boards	O
,	O
has	O
optional	O
embedded	O
Bluetooth	B-Protocol
.	O
</s>
