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 density. A variation of this approach is used in some modern automobile engines.
How does 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 are the benefits of an Atkinson cycle engine?
The Atkinson cycle is ideal for hybrids because their electric motor(s) make up for the lost low-speed output. The Atkinson cycle delays the intake valve’s closing until the piston has completed 20 to 30 percent of its upward travel on the compression stroke.
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.
How much more efficient is an Atkinson cycle engine?
The larger 1.3-liter Atkinson cycle engine uses a high compression ratio (13.5) and all the same engine innovations to achieve thermal efficiency of 38 percent.
What is the biggest engine in the world?
Its largest 14-cylinder version is 13.5 metres (44 ft) high, 26.59 m (87 ft) long, weighs over 2,300 tons, and produces 80,080 kW (107,390 hp). The engine is the largest reciprocating engine in the world.
|Length||26.59 m (87.2 ft)|
|Height||13.5 m (44 ft)|
|Dry weight||over 2,300 tons|
Can you turbo an Atkinson cycle engine?
Another way to support an Atkinson-cycle engine is with electrical energy, as is found in a hybrid car. … “We were able to completely engineer this turbo and engine from the ground up as a unit, not have to find something off the shelf and then make it work,” adds Williamsen.
Who uses Atkinson engines?
This system is currently used on the Scion FR-S and Subaru BR-Z. It “combines injectors that inject fuel at high pressure directly into the cylinders, together with conventional injectors, injecting fuel into the intake ports,” according to Toyota. The two systems turn on and off depending on engine speed.
What engine is in a Toyota Prius?
|Toyota Prius (XW30)|
|Engine||Toyota Hybrid System Gasoline engine: 1.8 L 2ZR-FXE I4 VVT-i (Atkinson cycle) Power: 73 kW (98 hp) at 5200 rpm Torque: 142 N⋅m (105 lb⋅ft) at 4000 rpm Electric Motors: Power: 60 kW (80 hp) Hybrid system total: 100 kW (134 hp)|
|Transmission||1-speed planetary gear|
What is Budack cycle?
The Budack cycle is a new version of the Atkinson engine cycle. It was created by Volkswagen to provide its vehicles with a more efficient combustion process and improved fuel efficiency. The Budack cycle also provides the driver with more power at-the-ready when they press down on the throttle.
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.
Which is more efficient Otto cycle or diesel cycle?
Explanation: Otto cycle is more efficient than Diesel cycle for a given compression ratio. … For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order.
How does a Miller-Cycle engine work?
In the Miller-cycle engine, the piston begins to compress the fuel-air mixture only after the intake valve closes; and the intake valve closes after the piston has traveled a certain distance above its bottom-most position: around 20 to 30% of the total piston travel of this upward stroke.
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 type of IC engine is used in Toyota Prius?
Known internally as the 1NR-FXE, the 1.5-litre four-cylinder petrol engine was installed in the 1997 Toyota Prius and paired with the fantastic new Toyota Hybrid System (now known as Hybrid Synergy Drive).
Who invented Atkinson engine?
James Atkinson (1846–1914) of Hampstead was a British engineer who invented several engines with greater efficiency than the Otto cycle. The Atkinson cycle engines were named the “Differential 1882”, “Cycle 1887” and “Utilite 1892”. The most well-known of Atkinson’s engines is the “Cycle 1887”, patented in 1887.