Hacked Gadgets Forum

January 17, 2015

Raspberry Pi Controlling an HCCI Engine

at 6:05 pm. Filed under Complex Hacks, Cool Gadgets, Electronic Hacks



This HCCI Engine Controlling Raspberry Pi setup reads in 240,000 samples per second. I had never heard of an Homogeneous charge compression ignition (HCCI) engine other than a diesel that simply compressed the air fuel mixture till combustion although I guess that is what some of those cars from the 80 were doing when they would continue to run after the key was turned off? I had always thought that gasoline engines needed a spark plug. But like many things if you through enough tech at it you can overcome the issues. 

“The Pi is recording data about pressure in each of the engine’s cylinders, about the angle of the crank and about heat release – and on the back of that, it’s subsequently controlling the engine in real time over a controller area network”



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One Response to “Raspberry Pi Controlling an HCCI Engine”

  1. signal7 Says:

    From what I was told, the old cars used to ‘diesel’ after the key was turned off due to carbon buildup in the combustion chamber. Those old cars ran with carburetors which were fairly inaccurate at metering out fuel. Consequently, there would end up being large carbon deposits in the chamber after about 80-100 thousand miles.

    Modern engines use fuel injection and have feedback mechanisms that control fuel delivery much more tightly. There should be less carbon deposits and the engine has no choice but to stop once there’s no more pulses to fire the fuel injector. A carburetor, on the other hand, delivers fuel as long as air is flowing through the intake manifold.

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