The thermal efficiency of the engine refers to the ratio of the thermal equivalent of the effective power of the engine to the thermal content of the fuel consumed per unit time. A simple understanding is the ratio of energy contained in gasoline to output power. The greater the ratio, the higher the working efficiency of the engine. The most intuitive performance is that vehicles are more fuel efficient and a box of oil can run farther.
Interestingly, since Toyota introduced efficient engines, many car companies in the industry have joined the queue of developing efficient engines. For example, independent brands such as Great Wall, Chang 'an and Guangzhou Automobile have developed turbocharged engines with thermal efficiency as high as 38%, but if we look around the world, we can still find many engines with "anti-day" thermal efficiency. So let's take a look. What are the top five mass-produced engines with thermal efficiency in the civil automobile field today?
Fifth place
FAW? CA4GC？ 2.0T engine
Thermal efficiency: 39%
Model: Hongqi HS5
Since its listing, Hongqi HS5 has been deeply loved by domestic consumers, not only because of the national pride endowed by Hongqi brand itself, but also because of its 2.0T, which is famous for its high thermal efficiency. As the domestic engine with the highest thermal efficiency at present, its thermal efficiency is as high as 39%.
In order to achieve high thermal efficiency, FAW adopted all-aluminum cylinder material, 350bar in-cylinder direct injection, dual VVT valve timing system for intake and exhaust and thermal management module. Although the technology is relatively complicated, the final result is still very satisfactory.
From the data point of view, this 2.0T engine has a maximum of 224 horsepower and a maximum of 340 Nm, which is the same as Toyota 8AR-FTS? The power of 2.0T is equivalent, but according to the owner's word of mouth, the comprehensive fuel consumption of HS 500km is 10.5L, and that of Highlander is 1 1.7L, which shows that this 2.0T FAW still has certain advantages in fuel economy.
fourth
Nissan? VC-TURBO？ 2.0T engine
Thermal efficiency: 39%
Model: Teana, QX50
For Nissan, the word "technical Nissan" is by no means a slogan in vain. What is the latest VC-TURBO developed by Nissan? The 2.0T engine can be described as a blockbuster in hard power. This 2.0T engine, code-named KR20DDT, is the first mass-produced vehicle in the world to support "variable compression ratio", and can be intelligently switched between 8: 1 and 14: 1 as required.
Because this 2.0T engine adopts a unique multi-link structure, it also improves the thermal efficiency of the engine. According to relevant engineers, the thermal efficiency of Nissan's 2.0T engine is 38-39%. If combined with the new e-POWER hybrid technology, its thermal efficiency will reach 45%, even higher than Toyota's THS hybrid system.
What's more, this 2.0T engine also has a comparable 3.5L? The power performance of V6 engine, with maximum power of 252 HP and peak torque of 380 Nm for 6.4 seconds, can explain many problems.
third place
Honda? Earth Dream 2.0L Hybrid Power System
Thermal efficiency: 40.6%
Model: Accord, CR-V, Hao Ying, Odyssey.
In a sense, Honda's hybrid system can go today, which is largely "forced" by Toyota. In the late 1990s, when Honda was still concentrating on developing high-power engines, Toyota had been brewing hybrid technology for many years, so it was naturally difficult for Insight equipped with a single-motor IMA system in the early days to compete with the Toyota Prius.
With the constant change of technology, Honda IMA has also been upgraded to i-MMD. The new hybrid system not only bypasses Toyota's patent on hybrid technology, but also achieves almost the same performance as today's Toyota THS hybrid system with the help of high-efficiency motor and series-parallel structure.
It is worth mentioning that although Honda does not advertise its thermal efficiency like Toyota, in fact, Honda 2.0L? The thermal efficiency of i-MMD system is as high as 40.6%, second only to Toyota's 4 1%. In actual use, the comprehensive fuel consumption of Accord hybrid and Camry hybrid is basically at the same level.
second
Toyota? Dynamic? Force? 2.5L hybrid power
Thermal efficiency: 4 1%
Vehicle models: Camry, Asian Dragon, brand-new Highlander, ES, etc.
Since Toyota entered the TNGA era, thermal efficiency has become one of the key "projects" of its propaganda. Its latest M20 series and A25A engines have a thermal efficiency as high as 40%, and the thermal efficiency of the 2.5L hybrid system is 4 1%. You know, with the development of internal combustion engine technology today, the improvement of thermal efficiency per 1% is extremely harsh for car companies, and Toyota can also improve the thermal efficiency of the engine to 4 1% on the basis of this mature hybrid system, which is absolutely unimaginable for its peers.
Specifically, in this hybrid system, the engine can provide 178 horsepower, the motor can provide 120 horsepower, and the comprehensive power of the system is about 2 14 horsepower, which is still very surplus for a family B-class car. In addition, the essential difference between Toyota's hybrid system and Honda's hybrid system is that Toyota's working logic focuses on motor-assisted engine, so that the engine is always in the best efficiency range; Honda's working logic is closer to the extended program principle, that is, the engine is responsible for power supply most of the time, driven by the motor at medium and low speeds, and driven by the engine only at high speed or sudden acceleration.
It must be said that both of them have their own advantages in the hybrid system of oil and electricity, but in terms of maturity and market awareness, Toyota's launch time is earlier, and it will certainly be better.
first
Mazda SKYACTIV-X? 2.0 liter engine
Thermal efficiency: 43%
Model: CX-30, Mazda 3 (both overseas versions)
It is really surprising that Mazda can build the engine with the highest thermal efficiency in the world, but it is not impossible for the "science students" in this automobile industry. After all, even the rotary engine was mass-produced, what difficulties can stop it?
20 19, Mazda launches new SKYACTIV-X? 2.0L engine, the engine thermal efficiency is as high as 43%, the maximum power reaches 188 horsepower, and the peak torque is 222 Nm, even if it is the latest development of Toyota? Force? The 2.0L engine is not comparable in parameters.
Mazda tried its best to win this "first". First of all, this engine adopts SPCCI spark control compression ignition technology, which can realize ultra-thin combustion; Secondly, in order to create conditions for homogeneous compression ignition, Mazda also uses spark plug to assist ignition to improve the pressure and temperature in the cylinder.
At the initial stage of listing, Mazda only launched this brand-new 2.0L engine in the European market, but it is reported that the CX-30 entering China this year will also be equipped with a brand-new 2.0L engine, and Mazda fans are expected to "climax" collectively.
Conclusion: It has to be said that today's internal combustion engine technology is not what it used to be, and from the current trend, Japanese car companies are more keen on building engines with high thermal efficiency. I believe that in the future, we can see more car companies launch more advanced engines and bring internal combustion engine technology to a new starting point. If it were you, which one of them would you like?
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.