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Aaron Cake
Administrator
Canada
6718 Posts |
 Posted - Jun 14 2005 : 10:44:38 AM
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So as the load on the engine goes up, what happens to the pressure? I would guess it would start to drop because the engine speed (thus air draw) goes down? So then pressing on the gas petal opens up the throttle allowing more air in (in a NA engine) and bringing your RPMs back up?
On a turbo engine, as load increases, manifold pressure increases as the turbocharger is driven harder by the exhaust gasses. Generally, in an NA engine, manifold pressure is at it's lowest under wide open throttle, unless the intake manifold/throttle is a restriction in which case the engine will draw a high vacuum under load as it tries to suck in air.
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The 'microcontroller magic' is probably a PI or PID control loop. These sorts of algorithms can be very 'tweakable'. I have lots of fun playing around with PID servo controllers in the lab. Changing the 'weights' of the various amplification stages in the control loop can make it do all sorts of entertaining things...
It's nothing really special. Most of them I'm sure are just Motorola chips.
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Kale
Nobel Prize Winner
Canada
795 Posts |
Posted - Jun 14 2005 : 12:09:45 PM
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On a turbo engine, as load increases, manifold pressure increases as the turbocharger is driven harder by the exhaust gasses. Generally, in an NA engine, manifold pressure is at it's lowest under wide open throttle, unless the intake manifold/throttle is a restriction in which case the engine will draw a high vacuum under load as it tries to suck in air.
So then the compressor driven by the turbo feeds the manifold which the engine is sucking on to get air. Interesting. Can you recommend an overview style book on NA vs. Turbo in engines?
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It's nothing really special. Most of them I'm sure are just Motorola chips.
Hey, the Caddy has 40 of them. At least they don't run Micro$oft products. Good 'ol assembler...
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Aaron Cake
Administrator
Canada
6718 Posts |
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Kale
Nobel Prize Winner
Canada
795 Posts |
Posted - Jun 16 2005 : 1:04:18 PM
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Thanks! That was a pretty good explanation of the Turbo process.
Wikipeda has some good general engine links too. Just search for 'rotary engine'. Animations and everything!
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Progress and Pics of My RX-7 Project (Project Tina
