visaman
March 30th 10, 05:26 PM
MegaSquirt is the registered trademark of an aftermarket electronic fuel
injection (EFI) controller designed to be used with a wide range of
spark-ignition internal combustion engines (i.e., not diesel engines, or
GDI.) It is a complete standalone fuel injection controller with proven
software and hardware, developed by Bruce Bowling and Al Grippo,
developers that work on the US East Coast. The software for the platform
is open for modification (for use on Bowling and Grippo hardware only).
The hardware provides for only fuel, ignition and idle air control in
most cases, keeping the cost low (though there are user configurable
outputs in most cases for other functions).
The hardware is open in that the schematics are available for
troubleshooting and educational purposes, but not for copying.
The source code of the firmware(s) are available to download for peer
review and end-user modification, but the code and derivatives are only
licensed for use on official Megasquirt hardware.
The product is aimed at the DIY market as in most cases MegaSquirt
requires assembly and tuning by the user, but they are available built
and tested.
Basic costs can be below US$300 as of 2009, although this will vary
widely depending on application.
It can be configured to run on engines from single 50cc cylinder engines
up to 26 liter displacement V12 engines.
The latest version is MS-III, it is capable of:
Speed-density, alpha-n or MAF for fuelling calculations
Real time barometric correction of the fuel equation with dual sensor (
option)
16x16 fuel tables in 0.1% steps with true interpolation and movable
rows/columns
16x16 spark tables in 0.1 degree steps with true interpolation and
movable rows/columns
Wall-wetting transient fuel control equation
On board datalogging to SDcard (max 333Hz sample rate)
Tuning by serial or built-in USB-serial port.
8 channels sequential fuel (hi-z injectors or low-z with external resistors)
2 additional fuel channels (hi-z or low-z)
8 channels sequential spark (logic level output)
6 channels mid current output for small solenoids or relays
2 'spare' conditioned 0-5V analogue inputs (+2 more raw)
Two wideband oxygen sensor input (external controller required)
(Up to eight widebands supported via external data capture)
GM-style stepper idle control
2 and 3 wire PWM idle control
Closed loop idle control
Closed loop mixture control - ideally with wideband O2 sensor
Closed loop boost control
Variable Cam control
Various boost control systems (gear, time, speed based)
Two stage variable nitrous control
2 step type launch control
CAN communications to interconnect other Megasquirt products e.g.
transmission controller
Supports external data capture boards (e.g. for external EGT boards and
knock detection)
EGT data support (with external amplifier)
Staged injection
ignition retard on engine knock ( data capture board and knock sensor
required)
Dual fuel (e.g. LPG)
Table switching, (mainly for dual fuel use)
Water/Meth injection
Individual cylinder injector trim
Injector phase timing
Individual cylinder spark trim
fuel composition sensor support
Support for numerous OEM trigger wheel patterns.
Magnetic (VR), Hall, Opto crank sensor input
Magnetic (VR), Hall, Opto cam sensor input
more info and link to support forums here:
http://www.ms3efi.com/
This thread discusses megasquirt on aircraft engines
http://www.msextra.com/forums/viewtopic.php?f=125&t=35423&p=241775#p241775
injection (EFI) controller designed to be used with a wide range of
spark-ignition internal combustion engines (i.e., not diesel engines, or
GDI.) It is a complete standalone fuel injection controller with proven
software and hardware, developed by Bruce Bowling and Al Grippo,
developers that work on the US East Coast. The software for the platform
is open for modification (for use on Bowling and Grippo hardware only).
The hardware provides for only fuel, ignition and idle air control in
most cases, keeping the cost low (though there are user configurable
outputs in most cases for other functions).
The hardware is open in that the schematics are available for
troubleshooting and educational purposes, but not for copying.
The source code of the firmware(s) are available to download for peer
review and end-user modification, but the code and derivatives are only
licensed for use on official Megasquirt hardware.
The product is aimed at the DIY market as in most cases MegaSquirt
requires assembly and tuning by the user, but they are available built
and tested.
Basic costs can be below US$300 as of 2009, although this will vary
widely depending on application.
It can be configured to run on engines from single 50cc cylinder engines
up to 26 liter displacement V12 engines.
The latest version is MS-III, it is capable of:
Speed-density, alpha-n or MAF for fuelling calculations
Real time barometric correction of the fuel equation with dual sensor (
option)
16x16 fuel tables in 0.1% steps with true interpolation and movable
rows/columns
16x16 spark tables in 0.1 degree steps with true interpolation and
movable rows/columns
Wall-wetting transient fuel control equation
On board datalogging to SDcard (max 333Hz sample rate)
Tuning by serial or built-in USB-serial port.
8 channels sequential fuel (hi-z injectors or low-z with external resistors)
2 additional fuel channels (hi-z or low-z)
8 channels sequential spark (logic level output)
6 channels mid current output for small solenoids or relays
2 'spare' conditioned 0-5V analogue inputs (+2 more raw)
Two wideband oxygen sensor input (external controller required)
(Up to eight widebands supported via external data capture)
GM-style stepper idle control
2 and 3 wire PWM idle control
Closed loop idle control
Closed loop mixture control - ideally with wideband O2 sensor
Closed loop boost control
Variable Cam control
Various boost control systems (gear, time, speed based)
Two stage variable nitrous control
2 step type launch control
CAN communications to interconnect other Megasquirt products e.g.
transmission controller
Supports external data capture boards (e.g. for external EGT boards and
knock detection)
EGT data support (with external amplifier)
Staged injection
ignition retard on engine knock ( data capture board and knock sensor
required)
Dual fuel (e.g. LPG)
Table switching, (mainly for dual fuel use)
Water/Meth injection
Individual cylinder injector trim
Injector phase timing
Individual cylinder spark trim
fuel composition sensor support
Support for numerous OEM trigger wheel patterns.
Magnetic (VR), Hall, Opto crank sensor input
Magnetic (VR), Hall, Opto cam sensor input
more info and link to support forums here:
http://www.ms3efi.com/
This thread discusses megasquirt on aircraft engines
http://www.msextra.com/forums/viewtopic.php?f=125&t=35423&p=241775#p241775