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- Source: SECU-3
3/info/secu" target="_blank">SECU-3 is an internal combustion engine control unit. It is being developed as an open source project (drawings, schematic diagrams, source code etc. are open and freely available for all). Anyone can take part in the project, and can access all the information without any registrations.
3/info/secu" target="_blank">SECU-3 system controls the ignition, fuel injection and various other actuators of the internal combustion engine (ICE) and vehicle. In particular, it is capable of controlling the carburetor choke using a stepper motor (auto choke), thus controlling RPM when engine is warming up. 3/info/secu" target="_blank">SECU-3 manages AFR on the carburetor engines (similar to AXTEC AFR systems), idle cut-off valve and wide open throttle mode valve in carburetor systems, controls electric fuel pump and gas valves in closed loop mode according to the feedback from the oxygen sensor. The 3/info/secu" target="_blank">SECU-3 system provides unique opportunities for reassigning the I/O pins of the mainboard for custom uses in engine tuning. It also provides smooth speed control of the engine electric cooling fan. The system includes its own software which allows editing all major settings and fuel and ignition maps in real time (when the engine is running), and switching between 2 or 4 sets of maps. 3/info/secu" target="_blank">SECU-3 system has many other advanced features (listed below).
Currently, there are five modifications of the unit:
3/info/secu" target="_blank">SECU-3. The first version of the unit, developed in 2007, controls ignition, cooling fan and has some other functions. In the latest software releases, the support for this unit had been discontinued. History of the 3/info/secu" target="_blank">SECU-3 versions with photos could be accessed here
3/info/secu" target="_blank">SECU-3T. It can control the ignition and fuel injection. It does not contain built-in power drivers for ignition coils, fuel injectors and idling air control (IAC) valve. External drivers must be used.
3/info/secu" target="_blank">SECU-3L. It was designed for ignition control only and it can be considered as a light version of the 3/info/secu" target="_blank">SECU-3T unit. However, it contains built-in drivers for ignition coils, as well as manifold absolute pressure (MAP) sensor. Regarding the software, it is fully compatible with the 3/info/secu" target="_blank">SECU-3T unit.
3/info/secu" target="_blank">SECU-3 Micro. Very easy-to-use and low-cost ignition controller unit in small plastic enclosure. Has only few inputs and outputs and doesn't contain built-in power drivers for ignition coils. It is the simplest 3/info/secu" target="_blank">SECU-3 unit.
3/info/secu" target="_blank">SECU-3i. Full-featured, complete engine management system in metal enclosure with integrated power drivers (for ignition coils, injectors, IAC actuator etc.), with extended number of I/O and Bluetooth connectivity. The latest development of the system. This unit has double-board design.
The device is developed using the 8-bit AVR microcontroller ATMega644, with 64kB memory (ROM), 4kB random access memory (RAM), and operates at a clock frequency of 20 MHz. It includes analog and digital inputs, separate chip for preprocessing signal from the knock sensor (KS) (except 3/info/secu" target="_blank">SECU-3 'Lite' and 'Micro' units), a signal conditioner for VR start-pulse sensor (except 3/info/secu" target="_blank">SECU-3 Micro unit), a signal conditioner for the VR crankshaft position sensor (CKP), the interface with a computer, and the outputs for actuators control.
Structural diagram of the system with 3/info/secu" target="_blank">SECU-3T unit:
Structural diagram of the system with 3/info/secu" target="_blank">SECU-3L unit is shown on the following picture:
Structural diagram of the system with 3/info/secu" target="_blank">SECU-3 Micro unit:
Example of wiring diagram of the 3/info/secu" target="_blank">SECU-3T unit for controlling of simultaneous or semi-sequential fuel injection on the 4-cylinder engine is shown on the picture below.
Hi-z injectors and stepper IAC valve are used. On the right side of picture we can see external connector functions which should be remapped to specified values. It is done in the 3/info/secu" target="_blank">SECU-3 Manager software.
History
The first version of 3/info/secu" target="_blank">SECU-3 was launched in October 2007 and successfully works on the author's (A.Shabelnikov) vehicle for now.
Since then, the project has received a lot of new features and synchronization methods. First discussing of the project was started in 2007 in one topic on the iXBT conference. Since Dec. 2010 discussion moved to the forum on diyefi.org. In 2013 own project's forum had been opened.
The system has evolved from the ignition control to the engine management system (ECU). The project is supported by author all the time.
Current status
Continue to develop and extend fuel injection features and algorithms (inter alia, full-sequential injection support). Also, author works on software for the 3/info/secu" target="_blank">SECU-3i unit.
Features of the current firmware related to fuel injection:
Simultaneous (all injectors open at the same time), central (throttle-body) injection, two banks alternating (two injectors or two banks of injectors fire alternately) and semi-sequential injection (injectors fire by pairs). In the nearest future full-sequential injection support will be added
Speed-density method of estimating airflow into an engine (MAP and IAT sensors are used)
Open-loop IAC (closed-loop algorithm (PID) will be implemented in the nearest future)
Closed loop control of AFR using oxygen sensor. Ability to set voltage threshold, integrator step etc.
Tables: VE, AFR, inj.open time, warm up enrichment, IAC position on cranking, IAC position vs coolant temperature, inj.time on cranking, inj.timing
After start enrichment
Acceleration enrichment (TPS, RPM)
Priming pulse (wetting of intake manifold) vs coolant temperature
License
GPL, TAPR OHL with one addition: developments can not be used in commercial purposes without written approval of author (according to information from the official site).
Features
Support of engines with the following number of cylinders: 1, 2, 3, 4, 5, 6, 8
Synchronization from CKP sensor and missing tooth wheel or from two sensors and non-missing tooth wheel. Support of 60-2, 36-1 and other wheels with different number of teeth (from 16 to 200)
Synchronization from Hall sensor (the distributor can be left in the system)
Advance angle regulation from engine speed (from 1 VR sensor, 2 VR sensors or Hall sensor)
Advance angle regulation from engine load (from MAP sensor)
Correction of advance angle depending on temperature (various types of coolant temperature sensors)
Correction of advance angle from detonation (from 1 or 2 knock sensors)
Measurement of on-board electric system voltage
Idle cut-off valve solenoid control
Control of power valve solenoid (part load enrichment valve)
Multichannel output (from 1 up to 6 igniters). It is possible to use up to 8 channels!
Support of 2 channel igniters (single input driven by both edges)
RS-232 interface for reprogramming, control and tuning (with optical isolation) or USB interface (without optical isolation)
Able to control of engine cooling fan (use of PWM is also supported)
Starter blocking when engine speed reaches specified value
Gas equipment support (automatic switch between gas/gasoline modes)
Output for error indication āCheck Engineā with support of blink codes
Ability to emergency start of boot loader
Ability to recover settings in emergency case
Idle speed regulation using advance angle
Control of coil energy accumulation (dwell control)
Cam sensor support (coil per cylinder ā full sequential ignition)
Fuel injection control (central, simultaneous injection)
Injection timing control using custom fuel map
Calculation of air flow using Speed-Density method
AFR control on carburetor (Solex) by means of valve actuators with closed loop (oxygen sensor)
Additional features:
Control of an electric fuel pump
Tunable pulses output for Hall sensor or tachometer
Embedded stroboscope function (it is possible to use any free output)
Output and input functions remapping
Determine throttle gate position by TPS sensor
Processing and writing to log file signals from 2 additional inputs (e.g. Oxygen sensor can be connected)
Power management (ability of some functions to work after ignition is switched off, for instance working off cooling fan or auto choke control)
Carburetor choke control (using a stepper motor)
Stepper gas valve control
Support of speed sensor (Displaying and writing to log vehicle speed (km/h) and passed distance (km))
Control of manifold heater (also known as grid and intake heaters)
Correction of advance angle using air temperature sensor (connected to one of 2 additional inputs)
3 versatile programmable outputs, which can be programmed by user to perform different actions in very convenient and flexible way
Version differences
References
External links
Official site of the project
Official forum of the project
Author's official page in VK social network
Users' community in VK social network
Old forum of the project on DIYEFI.org
Old topic on the iXBT forum (when 3/info/secu" target="_blank">SECU-3 had no its own forum)
History of developing of the 3/info/secu" target="_blank">SECU-3T unit
Author's page on the GitHub (repositories)
Schematic diagram of the 3/info/secu" target="_blank">SECU-3T unit (for revCU6 board)
Repository containing all information and documentation
Electronic control unit for internal combustion engine 3/info/secu" target="_blank">SECU-3, p.90-95, ISSN 2411-2798
Ignition control system for internal combustion engines 3/info/secu" target="_blank">SECU-3L (Lite), p.115-121, p-ISSN 2079-5459, e-ISSN 2413-4295
Microprocessor system 3/info/secu" target="_blank">SECU-3 for internal combustion engine control, p.22-25 ISBN 978-966-8736-05-6
Fuel injection time calculation in the internal combustion engine control unit 3/info/secu" target="_blank">SECU-3, p.55-56
3/info/secu" target="_blank">SECU-3i PROGRAMMABLE ENGINE MANAGEMENT SYSTEM, Ń.67-73
MICROPROCESSOR CONTROLLED IGNITION SYSTEM 3/info/secu" target="_blank">SECU-3 MICRO, Ń.55-61
Schematic diagram of the 3/info/secu" target="_blank">SECU-3L (Lite) unit
Community in Google+
Community in Facebook
ATmega644 datasheet
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