I am a little lost on this one so far i know that diesel dose not control the air flow, but then what makes it rev's or accelerate, by injecting more fuel into the engine???? Someone explain this to me....

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Correct.

Diesels always have excess air, this is why dumping more fuel in makes it go faster....until you run out of air and get black smoke

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The engine takes as much air as it wants. You control the revs/power with your right foot, which controls the amount of fuel injected.

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That's what the injection pump is all about. When pressing the accelerator pedal, a mechanism is actuated in the injection pump that controls the quantity of fuel that will be registered through each injector.

The fact that there is no throttle plate is one of the reasons for a diesel engines efficiency. No throttle plate means that air is more easily drawn into the cylinders which decreases pumping losses. In a gas engine with a throttle plate, when it is closed or near closed the engine is wasting energy just trying to draw fuel/air.

The gasoline engine runs at stoichiometric air-to-fuel ratio at all rpms (gets a little richer at high loads), i.e around 15 parts air to 1 part fuel. Opening throttle allows more air and fuel system keeps up to maintain the ratio.

http://en.wikipedia.org/wiki/Air-fuel_ratio

Since diesel has no throttle, air injestion is always the same, i.e. as much as will flow in.

Diesel indeed has variable air-to-fuel ratio, and this is one reason they are so efficient at idle, since the ratio could be as high as 150 to 1. This is also the reason diesels don't warm up at idle and can actually lose temperature when returned to idle. If you aren't burning any fuel, you aren't generating any heat.

http://www.internationaldelivers.com/assets/pdf/dyk168i.pdf

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