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. If the engine is only run at high powers intermittently, then the power of the engine can be supplemented by an electric motor during times when high power is needed.

Toyota Prius 2004 NHW20

This forms the basis of an Atkinson-cycle-based hybrid electric drivetrain. These electric motors can be used independently of, or in combination with, the Atkinson-cycle engine, to provide the most efficient means of producing the desired power.

Multiple production vehicles use Atkinson-cycle engines:

Toyota Prius hybrid electric (front-wheel drive) with a compression ratio of 13.0:1
Ford Escape/Mercury Mariner/Mazda Tribute hybrid electric (front- and four-wheel drive) with a compression ratio of 12.4:1
Toyota Camry Hybrid hybrid electric (front-wheel drive) with a compression ratio of 12.5:1

Note that any compression ratio shown above only reflects the physical compression ratio, which provides the ratio of the combustion chamber volumes when the piston is at "bottom dead center" versus "top dead center". The effective compression ratio of the air-fuel mixture in an Atkinson-cycle engine, with respect to atmospheric pressure, is lower due to the aforementioned delay in closing the intake valve.

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

Atkinson cycle vehicles using

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