Free valve engine




Free valve engine

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  • A camless or free-valve piston engine is an engine that has poppet valves operated by means of electromagnetic, hydraulic, or pneumatic actuators instead of.

    The world's first FreeValve engine intended for mass production will be driven on to the Qoros stage at the Guangzhou Motor Show in.

    The latest to catch my attention: engine valves that operate without camshafts. Now a spinoff of hypercar maker Koenigsegg called Freevalve.

    Free valve engine

    Free valve engine

    The Mooneyes Christmas Show. Henry Stephens November 21, at The reciprocating valves have mass and inertia and hot exhaust valves limit the compression ratio as they promote detonation, knocking. New experimental drug rapidly repairs age-related memory loss and improves mood. It is the turbulence generated from this vortex when it collapses as the piston compresses it past a certain aspect ratio, that promotes fast combustion, a laminar flame speed of gasoline is only 3 metres per second without turbulence.

    Free valve engine

    Free valve engine

    Free valve engine

    Free valve engine

    Free valve engine

    liter ‘camless’ engine delivers hp in Qoros 3

    British company Camcon Automotive has built the first fully electronic engine valve system, uncoupled from the crankshaft, that offers unprecedented control over the combustion cycle.

    On top of power and emissions improvements, it also opens up some weird and wonderful capabilities we've never seen before, such as giving 4-stroke engines brief 2-stroke power boosts. Variable valve timing is nothing new. It's been obvious to manufacturers for decades that the optimal valve operation is different when the engine's doing different things, and that changing the timing, lift and duration of the valve events on an engine to suit different scenarios can result in power, torque, efficiency and emissions advantages.

    Free valve engine

    What makes Camcon's system different is that it allows complete, instant and unrestricted control over exactly what any intake or exhaust valve is doing, at any time, regardless of what the engine itself is doing.

    There are no timing belts or valve springs, with each valve getting its own miniature camshaft, complete with a desmodromic system that opens and closes the valves precisely and mechanically. And instead of being driven off the crank, each valve's camshaft is controlled by an electric motor. These motors can rotate either way with total precision, and for a given valve event they can rotate through fully to give percent of the available valve lift, or they can stop part-way through and return back to closed, so you can get literally any degree of valve lift you want, at any time.

    Free valve engine

    There's a video at the bottom of the page to give you a better visual explanation. The system knows the position of the crankshaft at all times thanks to a rotary position sensor — in fact, the whole system runs under real-time, closed-loop control, so that valve events are timed perfectly against what the motor's doing. You can change timing, you can change duration, you can change lift, you can even shape the events if you want.

    You can do double events. You can change the profile of your camshaft between one event and the next. You can go from your idle setting to percent throttle in one revolution. You can do pretty much anything. You've got what we like to call a digital crankshaft. It seems like a simple enough idea, moving to electronic control of the valves. So why hasn't it been done before? What's happened in the recent past is that there's now sufficient processing bandwidth at a low price that can tolerate top of engine conditions, so you can actually put real time control on top of these motors.

    Naturally, this lets car manufacturers run highly optimized versions of the same tricks they've done with traditional VVT systems previously — bit of extra torque down low, bit of extra horsepower up high, improved emissions.

    Free valve engine

    And the company has several bench engines running, as well as one built into a drivable car to demonstrate these kinds of simple advantages. Nobody's ever done variable valve timing on the exhausts, so the benefits are less well understood.

    And against the Jaguar Ingenium , which is pretty much a state of the art petrol engine, we got CO2 benefits of up to 7. We believe with transient calibration and all that kind of stuff where we integrate it properly into a vehicle, we could show CO2 benefits of up to 20 percent.

    What Is Koenigsegg FreeValve? Camless Engine!



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