The past 2021 was undoubtedly a bumper year for Great Wall Motors, with a total annual revenue of 136.4 billion yuan, an increase of 32.04% year-on-year, and a net profit of 6.73 billion yuan, an increase of 25.41% year-on-year.
Such a high revenue and profit is naturally the result of the full blossoming of new products of Great Wall Motors in recent years, Haval, Weipai, Euler, tanks, in 2021 have brought their own fist products, both in the sales list and the Internet hot search list are among the best.
Most of these popular models are very characteristic: Euler Black Cat, a cute economic pure electric car, tank 300, the most cost-effective hardcore off-road vehicle. The largest sales volume of Haval H6 is quite good in all aspects of product strength.
With the country's higher requirements for automobile energy consumption and emissions, hybrid has become another hot spot in research and development. Great Wall also released lemon hybrid DHT technology late last year. This technology is currently being implemented on many new cars in Weipai and Haval. What are the highlights of this system?
We know that a fuel-efficient hybrid system must have two components: a sufficiently efficient internal combustion engine, an electromix system with excellent control logic, a sufficiently intelligent electronic control system, and a durable battery pack.
Let's start with the engine, since it is an engine that is compatible with hybrids, the engine itself cannot be the same as a pure fuel vehicle. Hybrid special engines are mainly aimed at more concentrated working conditions, so that the concentrated working conditions are mainly to make the engine work in the high efficiency range as much as possible.
Therefore, the maximum thermal efficiency of the hybrid engine must be high enough, and it does not need to be too broad of the high thermal efficiency range, so that the technical route is very clear for the hybrid engine. Through more than 80 core patents, the Lemon Hybrid DHT optimizes the working range of the 1.5T engine and reduces fuel consumption to less than 5L/100km.
But for the lemon hybrid DHT, its most core component is the DHT electromix system, and its importance is even higher than that of the engine.
This is a bsfc diagram of the engine, close to the center, the efficiency map of the engine is like a target, and the maximum efficiency interval is like the red heart of this target, and the hybrid system is like a sight, helping the engine to work more accurately in that area.
DHT does this by making the engine and wheels work without mechanical connections. The advantage of this is that the engine does not enter the inefficient operating range.
There is no mechanical connection to the power transmission, that is, the use of two motors, one connected to the engine is responsible for power generation, one is responsible for converting the generator's electricity into power to drive the wheels, as for the engine to generate excess electricity, it is stored in the battery. This is also the basic idea of many hybrid systems now. The Great Wall Lemon DHT is no exception.
But the biggest difference between the Great Wall Lemon DHT and other hybrid systems is the structure of the engine direct drive.
In addition to the ideal ONE range extender and nissan e-POWER series, most hybrid systems will have an engine direct connection function, at which time the engine and wheels have a mechanical connection and decoupling. The advantage of this is to make the power transmission of the engine in the efficient range more efficient, reduce the power transmission loss, and avoid the copper and iron losses generated by the generator when it rotates at high speed.
Toyota uses planetary gear stepless variable power shunt, while Honda, BYD and Geely use clutch control strings in parallel, and the Great Wall Lemon Hybrid DHT belongs to the latter, but it is not the same as other car companies.
Many hybrid gearboxes contain the research and development results of fuel vehicle transmissions of car companies. For example, Toyota's use of planetary gear structure is born out of the AT transmission developed by Toyota and Aisin, and the Great Wall, before the development of lemon hybrid DHT, has the same deep research and development skills in the dual-clutch transmission.
Many independent brands devote themselves to the dual-clutch transmission, but the dual-clutch transmission structure is not much different from the manual transmission, which is much simpler than the atta transmission research and development. However, few manufacturers have developed hybrid transmission technology through dual-clutch transmissions, because everyone believes that hybrid transmissions do not need gearing at all.
But on the Great Wall Lemon DHT, the advantages of multi-gear direct connection have been played. The two gears are responsible for low-speed direct connection and high-speed direct connection, whether it is 60km/h cruise commonly used on the main road of the city, or 100-120km/h cruising used on the highway, the engine direct connection can be competent.
The advantage of this is that the direct connection condition can be used in the widest possible range, reducing the energy loss caused by multiple energy conversions in the series condition.
In this way, the Great Wall Lemon Hybrid DHT has four working conditions, namely EV pure electric mode, series mode, low/high speed parallel mode and engine direct drive mode. Maximize the thermal efficiency of the engine.
In addition, the structure of the Great Wall Lemon DHT is also very similar to the manual transmission, using a synchronizer to control the gear switching. Using the most reliable technology to carry the most advanced hybrid system, the Great Wall's car manufacturing heritage must be admired.
A complete hybrid system, the battery is indispensable. In the current Euler models, the Great Wall mostly uses batteries from the Ningde era. However, the recent rise in the price of battery raw materials shows that battery technology is best to grasp in the palm of your own hand.
Therefore, the Great Wall's Hive Energy Technology has also come up with its own latest battery technology, which is called "Dayu". It not only provides a 204km battery life on the Mocha DHT-PHEV, but also lays an important foundation on battery safety.
Dayu batteries did not choose more stable lithium iron phosphate like BYD blade batteries, but used ternary lithium batteries with higher energy density but easier to explode after damage, and the flammability of the battery itself did not change much.
However, the Great Wall blocks and unclogs the heat of the battery after the battery pack overheats, minimizing the loss caused by the thermal runaway of the battery.
The thermal runaway of the vehicle power battery generally starts from a battery module, and the surrounding battery module is affected by heat transfer, which causes a domino effect and causes the entire battery pack to explode and burn.
The Great Wall dredges the heat generated by the battery module through a metal separator with holes. When the battery module is thermally out of control, the high-temperature gas generated, that is, the gas-fire flow, will be discharged above these separators in time through these holes. The module and the module are insulated by a laminate, so the air and fire flow will not affect the surrounding modules.
In addition to the separators, Dayu Battery also treats the exhaust gas and fire flow to ensure that the temperature of their discharge is not higher than 100 ° C, ensuring that the gas and fire flow does not ignite the items around the battery.
As the technical reserves of independent brands become more and more advanced, more and more consumers pay attention to independent brands when buying cars, and the Great Wall has not only become a darling on the Internet with its deep technical reserves, but also more and more recognized by everyone in the automobile market. Wei Jianjun, CEO of Great Wall Motors, was once a hardcore JDM fan, but now, Great Wall's products have been able to represent the Chinese automotive industry and go to the world.