Editor-in-Chief | Zhang Kehuan
Edit | Zhang Li
Author | Steamy Jun
Reports from The GreatAuto
Do Chinese like coffee? I don't think so.
However, the budget-conscious Chinese consumer is likely to like the Latte DHT hybrid SUV from Wei brand. The comprehensive fuel consumption of 100 kilometers is less than 5L, and the acceleration time of zero hundred is only 7.5 seconds. In the eyes of the data party, the SUV equipped with DHT technology has won. However, with a realistic attitude, how is the latte DHT car? Let's start with its hybrid structure and principle.
Can blue out of blue be better than blue?
Tank off-road, coffee intelligence, lemon hybrid has been called the "troika in the field of Great Wall technology". Among them, tank off-road platform and coffee intelligence needless to say, I believe that many Great Wall owners have seen their capabilities. And the coffee hybrid system equipped with the latte DHT, where is the sacred?
Before interpreting the Great Wall DHT technology, we should first review Honda's i-MMD hybrid technology. Although the names of the two are different, the i-MMD hybrid technology is the "teacher" of the Great Wall DHT.
The i-MMD is simply a range-extended hybrid model equipped with a small capacity battery, and it cannot be charged externally, and the engine can directly drive the wheels. At a speed of less than 70Kph, the fuel engine only plays a role in generating electricity, and the wheels are driven by an electric motor; when the speed rises, the efficiency of the motor decreases, and the engine is directly connected to the wheel through a set of clutches, and the engine is used to drive the wheels.
The DHT technology of Weipai Latte is somewhat similar, but the structure is more complex.
From the overall structure point of view, the power system of latte DHT includes a 1.5T hybrid special engine, a multi-mode fixed-shaft hybrid transmission, a GM/TM dual motor, a dual motor controller and five integrated DCDC subsystems.
I believe that seeing here, everyone has discovered: the Great Wall's DHT technology has one more set of gearboxes than the i-MMD, and this gearbox has 2 gears, which can achieve direct drive in the mode of engine-driven wheels.
To be more detailed: the gearbox is arranged in a parallel shaft. During the electric drive of the vehicle, the TM drive motor is connected to the differential by means of a two-stage gear reduction to achieve direct power output. When the engine is involved in the drive, the engine is connected to the GM generator through the reducer, and the C1 clutch is set up to control the engine power intervention, and in the engine drive mode, the two-stop torque function is realized.
Therefore, the working principle of Weipai Latte DHT technology is that at low speed, the engine is only responsible for power generation, and the wheels are driven by electric motors; and in high-speed conditions, the engine can directly drive the wheels, but thanks to the credit of the two-speed gearbox, the engine speed can be reduced as much as possible in high-speed conditions, so as to achieve a further fuel-saving effect.
Whether this system is good or not depends on the efficacy
Whether it is Toyota THS or Honda i-MMD, to determine whether a hybrid system is good enough, in addition to seeing whether its structure is scientific and reasonable, it also depends on its actual use performance. For example, whether this hybrid system can really play a fuel-saving and energy-saving effect, and how the driving quality of the vehicle is...
First of all, from the perspective of the drive mode of the vehicle, the latte DHT can realize EV mode, series mode, parallel mode, engine direct drive mode and energy recovery mode. Under various modes, it also corresponds to different scenes.
First, EV mode
In this mode, two major conditions need to be met, namely, the battery is sufficient and the speed is low enough. When the vehicle starts or the congestion in the urban area slows down, the motor drives the vehicle, and the engine is not involved in the work at this time, which is equivalent to standing on standby in place.
Second, in-line mode
In the case of low and medium speed, the battery power is not much, what to do? At this time, if it is driven by an engine, the engine will inevitably be in a high load range, and the fuel consumption will be very high. At this time, the engine will avoid the high load range of directly driving the wheels, and generate electricity for the electric motor in the efficient speed range to reduce energy consumption.
Third, parallel mode
In fact, in this mode, the main scene lies in the middle and back section of the rapid acceleration process. At this point, the engine and the motor drive the wheels at the same time, accelerating at full force.
Fourth, the engine direct drive mode
When the vehicle is cruising at a higher speed, the power consumption of the motor will increase. Taking a pure electric SUV of about 1.8 tons as an example, when cruising at a speed of 100km/h, the vehicle's 100 km power consumption will even be as high as 20kWh. At this time, it is exactly the "comfort zone" of the operation of the fuel engine. At this time, the latte DHT drives the vehicle directly through the engine, and it can also be torqueed through the gearbox, which is conducive to reducing the fuel consumption of the vehicle.
Fifth, kinetic energy recovery mode
Needless to say, when the vehicle is slowing down or cruising at high speed, there will be excess energy in the power system. And this excess energy can just be used by the power battery. In this way, the latte DHT is really "carefully calculated".
With the blessing of the five major modes, the drive system of latte DHT has almost covered most of the car scenes. You want to save fuel, it can save fuel, it wants power, it has power. And the rest, it depends on whether the material of wei brand is thick or not, or whether the motor/engine technology is deep or not!
First of all, in most operating conditions, the latte DHT needs to "deal" with the drive motor. Although the car only has a front-mounted drive motor, it can also bring a power reserve of 130kW. Put it this way, even when the motor is driven, the latte DHT can be relatively easy to push the vehicle.
And in in-line mode, everything is fine to say. The 115kW engine, coupled with the 130kW motor, works together to allow the latte DHT to complete zero-hundred acceleration in 7.5 seconds. Such a performance is not as violent as the Song Plus DM-i dual motor version. However, it is more balanced.
For example, in terms of fuel consumption, latte DHT's 100 km NEDC fuel consumption is 4.9L. And unlike other hybrids, the more high-speed the latte DHT runs, the more fuel-efficient it is. Compared with toyota THS or Honda i-MMD hybrid system, latte DHT is not weaker than the first two.
The last question is, what is the driving quality of the latte DHT? First of all, when the engine starts, the author measured that the overall jitter and noise of the latte DHT is still relatively small, almost comparable to Honda. However, the car's 2-speed gearbox, while efficient, also has a problem. That is, in direct engine mode, when the gearbox is shifted, the driver and passenger may still feel a certain amount of shaking or pause. Fortunately, the latte DHT's high-end model is equipped with an active electromagnetic suspension, which can be pulled back by the texture of the chassis.
What kind of user is suitable for latte DHT?
Now in the domestic brand, there are so many reliable hybrid systems, what does latte DHT rely on to attract people?
First of all, from the driving experience, the latte DHT power is not weak, the fuel consumption is not high, and the overall quality is already relatively good. But in the face of a number of strong opponents such as BYD DM-i, where are the advantages and disadvantages of latte DHT?
First, let's talk about a problem with the car. That is BYD's DM-i model, such as the Song Plus DM-i car has a large battery, can achieve a pure electric endurance of 51 kilometers, and can also be on the green card.
The LATTE DHT, on the other hand, can only be on the blue card, and can not be externally charged, can not get more than 10 kilometers of pure electric mileage. For users in limited purchase cities, latte DHT naturally does not have many advantages.
However, for users in local cities who do not have a limited license plate, cannot install charging piles at home, and do not want to charge every day, latte DHT is equivalent to the hybrid model of Honda and Toyota, which is convenient to use, low fuel consumption, and good dynamic performance. More importantly, in the later maintenance and maintenance process, consumers do not need to worry about the battery loss too fast, because the battery capacity of this car is only a few kilowatts... When it comes to maintenance, it is no different from the normal maintenance process of fuel vehicles.
So, in front of the Japanese hybrid, what are the characteristics of the latte DHT?
First of all, for the Toyota THS, the latte DHT solves the problem of high-speed power and can provide the same good power performance for the driver at high speed. For the Honda i-MMD, the latte DHT has a set of 2-gear transmissions, so when running at high speed, the fuel consumption will theoretically be lower.
Finally, you may think that latte DHT is using a new technology, is its reliability stable?
In fact, there is no need to worry about this, latte DHT offers a 5-year or 150,000-kilometer vehicle warranty and an 8-year or 150,000-kilometer battery pack warranty. Even if you really encounter a situation, there are manufacturers who have a bottom. Therefore, during the cycle of the car, we do not need to worry about reliability.
epilogue
From the technical route, the latte DHT is more like a hybrid system equipped with a set of "checking for defects and filling in leaks". First of all, its fuel economy is not a problem, in line with our expectations for hybrid models. Secondly, it makes up for the weak power of most hybrid models and the rise in high-speed fuel consumption, which is also a place worthy of our praise. Finally, even though the latte DHT still has a slightly frustrated gearbox shift, we have reason to believe that the Great Wall will improve this problem in the next generation of DHT technology. Can the hybrid system be perfected in later stages? We'll see!
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