In addition to the early two-stroke Saab models, most cars currently use four-stroke engines.
But Porsche wanted to see if more strokes would perform better.
According to foreign media reports, Porsche has applied for a patent for the “secondary three-stroke (i.e. six-stroke) burner method.
” The patent was filed in February this year and was published by the U.S. Patent and Trademark Office (USPTO) on September 12.
, (Photo source: Porsche),”stroke” refers to the up and down movement of the engine piston in the cylinder.
A four-stroke engine requires four such movements (or two crankshaft revolutions) to complete a power cycle, in which air and fuel are drawn into the combustion chamber, compressed, burned (also called a power stroke), and discharged, converting energy into rotational force.
A two-stroke engine (such as a lawnmower) can complete the process with only half the number of strokes, or only one crankshaft rotation.
, Porsche’s patent application mentions that its engine design adds one compression and power stroke by changing the stroke length.
This is achieved through a set of eccentric gears that make the bottom dead center of the piston deeper, creating extra stroke.
This exposes the ventilation port and draws in more air.
After that, more fuel is injected and ignited.
, The company’s goal seems to be to get more power, as six-stroke engines have two power strokes, compared to four-stroke engines with only a single power stroke.
This means that there is a power stroke every three revolutions of the crankshaft, rather than one power stroke every four revolutions like in a four-stroke engine.
, However, whether such devices can meet current emission standards remains a big question.
Therefore, it is not yet certain whether the device will actually be used in mass production vehicles.
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