Differential Stroke-Cycle Piston Technology (D-Cycle)
Our D-Cycle replaces the piston in a traditional internal combustion engine with a vertically split-piston. This concept changes the engine’s basic functionality and transforms the way it produces power by achieving four engines strokes (instead of two) in a single crankshaft revolution.
The heart of the D-Cycle is a vertically split-piston that has a crown that moves independently of the seat. The working path for a typical D-Cycle implementation is shown below.
From left to right, the D-Cycle’s crown is mated with the seat during the power stroke. The two halves split at the low pressure portion of the power stroke, and the crown performs the exhaust and intake strokes. The crown and seat recombine during the compression stroke. All four strokes – power, exhaust, intake, and compression – are completed within a single rotation of a crankshaft.
This results in decreased cyclic energy losses, execution of a true mechanical Atkinson stroke, and ability to match intake displacement to power demand…all of which translate into higher power density and increased fuel efficiency.
Our D-Cycle can be designed into existing production engines and in some cases, is practical for retrofit. We have performed R&D on various engine types and have successfully retrofitted a range of engine sizes propelled by different fuel sources.
Our D-cycle can deliver further improvements in vehicle downsizing and weight reduction, and is perfectly suited for adoption into the mainstream automotive industry.