A few days ago, the public information of the State Patent Office showed that Great Wall Motor registered a number of patents related to variable compression ratio engines. Going to this step shows that the technology has broken through and it is not far from mass production. Many people should be familiar with variable compression ratio. Nissan's latest 2.0T VC-TURBO engine is variable compression ratio.
Thermal efficiency is the key technology.
The embodiment of engine technology is the thermal efficiency of the engine. At present, Toyota's 2.5L power engine has the highest thermal efficiency, and the thermal efficiency has increased to 4 1%.
You know, at present, the thermal efficiency of mainstream engines in the world has reached 38%, which is excellent. Nissan's latest 2.0T is 39%, Honda 1.5T is 38%, and Volkswagen 1.5T is 37.5%.
In the 20 19 China Heart Top Ten Engine List, autonomous engines accounted for 7 seats. Among them are Geely's hybrid power system, Chang 'an's Blue Whale 1.4T high-pressure direct injection engine, Chery's 1.6TGDI engine, Great Wall's GW4C20B 2.0T engine, Haima's 1.6TGDI engine, and Hongqi's 2.0T and 3.0T engines.
At present, Chery's 1.6TGDI engine has exceeded 37. 1%, but Chery's 1.6T hybrid engine is said to have the highest effective thermal efficiency, which is 4 1%. Changan's blue whale engine has also reached 40%, and even Ford will purchase Changan's engine; The engine of Hongqi has also reached 39%; The 2.0T of the Great Wall has reached 38.3%, and with the variable compression ratio, it may exceed 40%. It can be seen that the engine thermal efficiency of the head independent brand has equaled or even surpassed these international first-line brands.
Mixing becomes another way out.
Energy conservation and emission reduction is an irreversible direction. Mixing is another way out when the engine of fuel vehicle is continuously efficient. With the hybrid system, it can be kept in the best working condition for a long time, with high thermal efficiency, and even the fuel vehicle can reduce a lot of fuel consumption than before.
It is worth noting that the thermal efficiency of the engine is not fixed, it will change with the current working conditions of the engine. Therefore, the engine has a so-called economic interval, in which the thermal efficiency will be higher, and relatively, the engine will be more fuel-efficient.
The key to affect the thermal efficiency of the engine, or the economic interval, lies in the torque and speed of the engine, so as long as they are well controlled, the working interval of the engine can be controlled. In order to make the engine work with as high thermal efficiency as possible, many car companies choose to increase motor assistance.
For example, when the car is just starting and the speed is low, the engine efficiency is low because of the low load. At this point, the system will shut down the engine and the motor will provide all the driving force. When the vehicle accelerates or travels at a high speed, the required torque increases. At this time, the engine will step in and provide torque together with the motor. When braking, the motor is switched to the generator state to recover braking energy.
Therefore, even if the engine is not as good as the ordinary engine in peak thermal efficiency, the fuel consumption performance will be better, because it can stay in the economic zone for a longer time. In terms of hybrid, I have to mention Toyota's hybrid system, under which the 2.5L engine can reach the maximum thermal efficiency of 465,438+0%. In addition, in terms of independent brands, Geely's hybrid system has become one of the top ten engines in China Heart, and Chery's hybrid engine has also appeared.
Summary: In the frontal catch-up of fuel vehicles, the strength of independent vehicle companies can not be ignored, and the engine technology can be regarded as catching up with the brigade. The next step may be to chase the gearbox. Recently, the Great Wall Honeycomb Box announced a 9-speed wet dual clutch, and maybe the gearbox can keep up with the rhythm.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.