Atkinson-cycle engine

The Atkinson-cycle engine is a type of internal combustion engine invented by James Atkinson in 1882. The Atkinson cycle is designed to provide efficiency at the expense of power, and is beginning to see applications in modern hybrid electric applications.

Atkinson-cycle engine

Design

The original Atkinson-cycle engine allows the intake, compression, power, and exhaust strokes of the four-stroke cycle to occur in a single turn of the crankshaft, and was designed to bypass patents covering the existing Otto cycle engines. Due to the unique crankshaft design of the Atkinson, the expansion ratio may differ from the compression ratio. By adjusting the linkage to allow a power stroke that is longer than the compression stroke, the engine can achieve greater efficiency than with the Otto cycle engine. While Atkinson's engine design is no more than a historical curiosity, the Atkinson cycle, where the power stroke is longer than the compression stroke, is increasing in popularity due to the increase in fuel economy it provides.

Four stroke Atkinson-cycle engine

See Main Article Four stroke Atkinson-cycle engine

The Atkinson cycle may also refer to a four stroke piston engine in which the intake valve is held open longer than normal to allow a reverse flow of intake air into the intake manifold.

Rotary Atkinson-Cycle Engine

See Main Article Rotary Atkinson-Cycle Engine

The Atkinson cycle can be used in a rotary engine.

Vehicles using Atkinson-Cycle Engines

See Main Article Vehicles Using Atkinson-Cycle Engines

While a modified four-stroke engine using the Atkinson cycle provides good fuel economy, it is at the expense of a lower power-per-displacement than a traditional four-stroke.

Atkinson-cycle engine motion.

Atkinson cycle engine - Atkinson cycle 4strock - Atkinson cycle rotary -

Atkinson cycle vehicles using

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