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Electro-hydraulic valve actuation. It allows almost any intake valve schedule you want, giving good torque down low and power up high.
BMW was playing with the idea a while back, and they made a gas engine that didn't need a throttle plate, because it can use the intake valves to modulate power. BMW's valvetrain doesn't appear to have made it to market.
It's a good idea, if it can be made reliable and inexpensive enough. I hope it catches on.
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