Virtual engine to test OBD II output of stock computers

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Virtual engine to test OBD II output of stock computers

Postby Conecrusher » Thu Apr 21, 2005 7:31 am

How about a stimulator (virtual engine) for the stock ECU?

1) Install stand alone ECU of choice.

2) Tune.

3) Leave the stock computer hooked up to the diagnostic ports on the car (anyone interrogating the car would plug into the OBD port), since the stock Denso computer's wires leading to the sensors and actuators on the engine have been replaced by connectors from the stand alone, hook them up to a box that tells the stock computer that everything is just great - a digital lobotomy.

That way the car can be run using a stand alone computer and the stock computer can spit out appropriate code for emissions testing.

My inspiration for this idea is Megasquirt. Bowling and Grippo suggest the fabrication of a stimulator box to test their home brewed EFI or EEC modules, so what would it take to make a similar stimulator (virtual engine) for the much more complicated factory OBD II computers?


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Postby bofh » Thu Apr 21, 2005 2:32 pm

Actually, I can see some other uses here. Virtual tunning. Hook it up, and "drive" the car. Makes some changes and "drive" it again.
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Postby Conecrusher » Thu Apr 21, 2005 3:00 pm

Oh absolutely.

Bowling and Grippo designed their virtual engine "stimulator" for the Megasquirt/Megasquirt and Spark to fully examine a home made EFI unit prior to installing it in a vehicle. Trouble shooting a problem due to a sloppy glob of solder or a bad capacitor prior to installation in the car would be so much easier than after installation.

A virtual engine or "engine emulator on a circuit board" would be a great way to trouble shoot ANY ECU.
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