Often asked: What Is An Atkinson Engine?

How does the Atkinson cycle engine work?

The pistons are powered by gasoline, sprayed into the engine and detonated by the spark plug. The piston moves four times in each cycle: down to draw in gasoline vapour, up to compress it, down when the vapour ignites and explodes, and then up to push out the exhaust.

What cars have Atkinson engines?

Vehicles using Atkinson-cycle engines

  • Chevrolet Volt.
  • Chrysler Pacifica (front-wheel drive) plug-in hybrid model minivan.
  • Ford C-Max (front-wheel drive / US market) hybrid and plug-in hybrid models.
  • Ford Escape/Mercury Mariner/Mazda Tribute electric (front- and four-wheel drive) with a compression ratio of 12.4:1.

What is the difference between Otto cycle and Atkinson cycle?

An Atkinson cycle has a greater work output and a higher thermal efficiency than the Otto cycle at the same operating condition. The compression ratios that maximize the work of the Otto cycle are always found to be higher than those for the Atkinson cycle at the same operating conditions.

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Why is the Atkinson cycle more efficient?

The Atkinson cycle is ideal for hybrids because their electric motor(s) make up for the lost low-speed output. Compression and expansion ratios are the same in an Otto engine. Atkinson wins on efficiency because its expansion ratio is significantly larger than its compression ratio.

What is Toyota Atkinson cycle?

What Is the ‘AtkinsonCycle? Simply put, the Atkinson cycle aims to use all of the energy in the cylinder. It does this by leaving the intake valve open longer, creating a shorter compression stroke. In the Prius engine, the net result is an effective compression ratio of 8:1, while the expansion ratio is about 13:1.

Why are two stroke engines so loud?

The main reason that two stroke engines are loud is that they fire twice as often as four stroke engines. Two stroke engines have a very extensively designed exhaust system (expansion chamber) that reflects the sound wave back to the cylinder at a specific time.

What is Miller cycle in diesel engine?

The Miller cycle is an over-expanded cycle implemented with either early (EIVC) or late (LIVC) intake valve closing. Miller cycle has been implemented in both diesel and spark-ignited engines. In diesels, Miller cycle has been used primarily to control NOx emissions at high engine load.

What is meant by pre ignition?

Preignition (or preignition) in a spark-ignition engine is a technically different phenomenon from engine knocking, and describes the event wherein the air/fuel mixture in the cylinder ignites before the spark plug fires.

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What is the difference between an electric vehicle and those with a combustion engine?

The difference is that with an electric motor, very little energy is wasted, whereas combustion is by nature a highly inefficient process where much energy is lost along the way. Therefore, it’s the gas-powered vehicle that needs more energy.

What is meant by Otto cycle?

An Otto cycle is an idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine. The Otto cycle is a description of what happens to a mass of gas as it is subjected to changes of pressure, temperature, volume, addition of heat, and removal of heat.

What is the difference between Miller and Otto cycles?

The Miller cycle engine is compared to a standard Otto cycle engine using cycle analyses and multidimensional simulation, and basic engine design implications are discussed. It is found that the Miller cycle engine has a potential for improved fuel efficiency, but at the cost of a reduced power to weight ratio.

What are the different engine cycles?

The four-stroke cycle engine is the most common type of small engine. A four-stroke cycle engine completes five Strokes in one operating cycle, including intake, compression, ignition, power, and exhaust Strokes. The intake event is when the air-fuel mixture is introduced to fill the combustion chamber.

Is a Carnot cycle reversible?

The Carnot heat-engine cycle described is a totally reversible cycle. That is all the processes that compose it can be reversed, in which case it becomes the Carnot refrigeration cycle.

What is the disadvantage of a hybrid car?

Higher Purchasing Cost And Complex Hybrid Tech

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Due to their higher complexity, hybrid vehicles are considerably more expensive than their ICE counterparts. In addition to all the technology that is commonly installed in a conventional car, hybrid vehicles feature: electric motor(s) a large battery pack.

Which cycle is used in hybrid engine?

Full hybrids most often use the “Atkinson Cycle”. This is a four-cylinder engine operating cycle designed to increase efficiency at the expense of power by shortening the intake and compression strokes.

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