The article understands five major engine technologies that can increase driving pleasure

According to foreign media reports, with the increasingly stringent fuel economy standards, engineers began to devote themselves to the research and development of new technologies. Some of these technologies can enhance driving pleasure. Xiao Bian specially arranged five engine technologies for readers to appreciate. :

Higher Compression Ratios

In order to improve vehicle performance and fuel economy, it can be achieved by increasing the compression ratio of the engine. Compression ratio refers to the degree to which the engine gas mixture is compressed, using the ratio of the total cylinder volume before compression to the cylinder volume after compression (ie, combustion chamber volume). When the compression is high, it means that the fuel economy is higher.

However, when the compression is relatively high, there are also problems: When the temperature and pressure in the engine combustion chamber are too high, especially the mixture ignites ahead of time, and the interior of the engine will usually produce a knocking sound. Designers solve this problem to some extent by increasing the amount of octane gas. In addition, Mazda has developed a longer exhaust manifold that aims to reduce the temperature in the engine's combustion chamber and reduce the frequency of engine knock. Mazda's SKYACTIV-G system has a faster burning time, which means that as the temperature rises gradually, the system can ignite the air-fuel mixture before the engine detonates.

When these engine technologies are matched with lightweight materials and new gearboxes, their fuel consumption and emissions will decrease by 15%, and the torque reduction will reach 15% or more. Therefore, lifting torque can also be interpreted as increasing driving pleasure.

In-cylinder direct injection

In an in-cylinder direct injection engine, highly pressurized fuel is injected directly into the combustion chamber near the spark plug.

As this technology causes the pressure in the combustion chamber to increase, direct injection technology in the cylinder will also cause engine knock. Ford combines in-cylinder direct injection technology with turbocharging to improve its performance using exhaust gas. Ford used the above technology to create a more powerful, fuel-efficient and smaller engine, and named it EcoBoost.

The 2011 Ford F-Series demonstrated the strength of EcoBoost. With the weak purchase of the F-150, it will have an EcoBoost 3.5 L engine with maximum engine power and peak torque of 365 Hp and 420 lb-ft, respectively, and its horsepower weight ratio (horsepower per The pound ratio also improves driving pleasure and frees owners from refuelling.

Flexible fuel

This technology gives the driver flexibility in the choice of conventional gasoline or gasoline/ethanol mixtures. The ratio of the two components can be derived from the latter's name. For example, E85 means that in this mixture, ethanol accounts for 85% and gasoline accounts for 15%.

In general, flexible fuels are commonly used in large trucks and SUVs. The octane rating of ethanol is high, but the mileage per gallon (MPG) after use is reduced. However, for expensive high-performance cars, flexible fuel is its perfect match, and Bentley is committed to the complete compatibility of its fleet with flexible fuels.

Koenigsegg, a Swedish super-runner, uses ethanol to increase power and green credentials. When using gasoline, its limited-edition model CCXR has a maximum output of 806 Hp. With higher-octane ethanol, the engine's power output may jump to 1018 Hp.

Electric Power Boost (EV Power Boost)

Over the past decade or so, the hybrid system has long been in vain. This technique works very well, the battery lasts longer, and the gas mileage performs well.

However, it must be admitted that the driving pleasure of many hybrid models is very low. Jaguar is trying to remedy the launch of a "push to pass" feature for its C-X16 concept car, which was unveiled at the 2011 Frankfurt Motor Show.

The difference is that the “one-key acceleration” accelerator is located on the steering wheel. After pressing this button, the motor will provide 70 Hp of propulsive force, similar to the KERS system in Formula One racing. The Jaguar C-X16 can reach speeds of up to 186 miles per hour (approximately 299.3 kilometers), achieving less than 4.5 seconds of acceleration in 100 kilometers.

Cylinders on Demand

These engines can only use their required cylinders when necessary. For example: When the Audi S8 achieves 100 km acceleration in 4.2 seconds, eight cylinders need to be fully fired (cylinders firing).

But after a few seconds, when entering the cruising speed, there is no need to continue to maintain the above-mentioned operating state, and four of the cylinders will completely stop working, and they function like a four-cylinder engine. When the vehicle accelerates, the other four cylinders will again enter the operating state. When the speed is stable, cylinder deactivation will occur again. This technology increases fuel consumption by 10%.

Audi also uses an active noise control system to ensure that engine noise-level displacement remains constant. The new V8 engine is more powerful than the V10 engine and has better mileage fuel consumption.