Lets Talk GMLAN (J2411 SWCAN-Bus)
02-02-2013, 10:21 PM
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Lets Talk GMLAN (J2411 SWCAN-Bus) ive found some interesting stuff to help log data from high and low speed coms on the network.
a couple q's as i want as many opinions, view points, etc.. just dont go on and on with the 'cant, wont, dont' bs please.
i have found out through the use of google and other sources that:
-the bcm is commanding other modules in the network (a central hub of sorts). at least for the radio, locks, etc.
-the brake control module has all the sensor inputs for the suspension
-low speed SWCAN is for button presses (doors, radio, etc)
-there ARE SWCAN readers and the like that will read high and low with some... DIY... if you wanted a less expensive option
-simulators for other cars' CAN-Bus systems, again.. expensive if you arent a DIY'er
the questions are:
what is the suspension controller or PCM doing to translate the data into data that is plugged into the models used to run the engine, suspension, etc?
what could be used to simulate the 5v sensor inputs over the network?
how would one go about setting up a simple bench station for such a thing?
and
what could one do to recreate the network in a more compact way (sensor inputs and command in one module)? though, i suspect THAT is the 64,000 dollar question.
and..... GO! i will be patiently reading.
a couple q's as i want as many opinions, view points, etc.. just dont go on and on with the 'cant, wont, dont' bs please.
i have found out through the use of google and other sources that:
-the bcm is commanding other modules in the network (a central hub of sorts). at least for the radio, locks, etc.
-the brake control module has all the sensor inputs for the suspension
-low speed SWCAN is for button presses (doors, radio, etc)
-there ARE SWCAN readers and the like that will read high and low with some... DIY... if you wanted a less expensive option
-simulators for other cars' CAN-Bus systems, again.. expensive if you arent a DIY'er
the questions are:
what is the suspension controller or PCM doing to translate the data into data that is plugged into the models used to run the engine, suspension, etc?
what could be used to simulate the 5v sensor inputs over the network?
how would one go about setting up a simple bench station for such a thing?
and
what could one do to recreate the network in a more compact way (sensor inputs and command in one module)? though, i suspect THAT is the 64,000 dollar question.
and..... GO! i will be patiently reading.
02-04-2013, 04:36 PM
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2) leads on how to get at the operating system of the CAN
3) leads on how to create something that can consolidate the network..
among other things.
02-04-2013, 05:02 PM
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The Megasquirt can be made to run some of the European cars, because their Can Bus protocols are closer to the the J1939 standard they are built on, but the American manufacturer's stuff is a J1850 standard, and less common.
Something like the bypass modules that they have for the "autostart" industry. analog inputs converted to a data stream,for the dash, or vehicle data bus to parse, and use.
This stuff is definately "cutting edge" and interesting.
02-04-2013, 05:40 PM
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This could lead to a interface for the aftermarket ECMs to run the dash in a newer car install.
The Megasquirt can be made to run some of the European cars, because their Can Bus protocols are closer to the the J1939 standard they are built on, but the American manufacturer's stuff is a J1850 standard, and less common.
Something like the bypass modules that they have for the "autostart" industry. analog inputs converted to a data stream,for the dash, or vehicle data bus to parse, and use.
This stuff is definately "cutting edge" and interesting.
The Megasquirt can be made to run some of the European cars, because their Can Bus protocols are closer to the the J1939 standard they are built on, but the American manufacturer's stuff is a J1850 standard, and less common.
Something like the bypass modules that they have for the "autostart" industry. analog inputs converted to a data stream,for the dash, or vehicle data bus to parse, and use.
This stuff is definately "cutting edge" and interesting.
GM is J2411
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02-04-2013, 09:17 PM
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ive found a bunch of papers on the suspension controller stuff plus patents from GM/Delphi. nothing too useful computer wise (lots of useable physics for later) but quite interesting. those reading and doing things like changing text on the dash dont say anything about anything actually useful to us gear heads.
02-05-2013, 03:07 PM
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bump PLUS:
ive been looking into hardware to help with this project ad so far Arduino plus a Sparkfun CAN 'shield' looks like one of the best bets for what i want to do. on top of that.. a Raspberry Pi ARM computer may be useful later for more intensive simulation. its amazing how much people have done with the GMLAN actually amount to so little real in depth info about the more important systems.
ive been looking into hardware to help with this project ad so far Arduino plus a Sparkfun CAN 'shield' looks like one of the best bets for what i want to do. on top of that.. a Raspberry Pi ARM computer may be useful later for more intensive simulation. its amazing how much people have done with the GMLAN actually amount to so little real in depth info about the more important systems.
