"Slimming" is not a miracle? SAIC GM pushes four hybrid systems in two years

As we all know, the American cars have always been known for their large displacement and high fuel consumption. However, in this era of energy saving and emission reduction, the US Department of Vehicles has also begun to seek breakthroughs in new energy.

Take GM as an example. Although there is no major breakthrough in body weight reduction for new generation products, GM has launched several hybrid models in various forms since last year. Examples include the addition of the VELITE 5, the new LaCrosse hybrid version and the Cadillac CT6 plug-in hybrid. At the just-opened Chengdu Auto Show, the Cadillac XT5 hybrid was officially launched. The biggest highlight of the new car was the introduction of a light mixing system and the replacement of the all-new 9AT gearbox.

Perhaps careful friends will find that GM does not ship a full-fledged hybrid system to all models as Toyota did, but instead uses different hybrid models on different models. In addition, all GM 8AT models are busy changing 9AT. What kind of story does this have? Today, we will talk about Universal Hybrid and the new 9AT gearbox.

Four sets of mixed system

According to the general classification, the current GM has used all the mixed modes once: Extended Range Hybrid (EREV), Plug-In Hybrid (PHEV), and Non-Hi-Power Hybrid (HEV). What's the difference in using it?

Let's take a look at an extension-powered hybrid model. The Buick VELITE 5 is the driving method of this type. The wheels are driven solely by the motor and the battery. The fuel machine is only used to generate electricity, which increases the cruising range of the battery.

Plug-in hybrid models, literally understood that it is necessary to connect the charging equipment from the outside, that is, the main body of the battery as a source of power, fuel as a supplement to the power can be directly to the power output to the wheel. The Cadillac CT6 plug-in hybrid version uses this type of drive.

Non-plug-in hybrid power is a vehicle that does not use an external charging device to charge the power battery. For example, the LaCrosse hybrid version can use the motor as a generator. Under normal operating conditions, the motor is driven at a low speed and the engine is driven at a high speed. At the same time, when the engine is working, it can drive the motor to generate electricity to charge the battery.

This time, the Cadillac XT5 Light Mixer is powered by non-plug-in hybrids. In addition to having a 2.0L turbocharged engine that is identical to the XT5 28T, the light mixing system also has a main power generation system. Machine, a set of power battery packs, and an AC-DC converter.

How is light mixing mixed?

When it comes to "light mixing", many friends may be forced to make an instant. What is it? In fact, the “light” is actually only one type of hybrid that is classified according to the degree of mixing of the internal combustion engine and the electric motor.

At present, the commonly used hybrid classification standards in China are: micro-hybrid motor peak power and engine rated power ratio ≤ 5%; lightly mixed type ratio is 5%-15%; moderately mixed type ratio is 15%- 40%; the ratio of heavily mixed type is greater than 40%.

Judging from the classification of the entire hybrid system, light mixing is a technology that is between start-stop and mid-mix. In fact, starting and stopping is regarded as micro-mixing because of the technical classification, because there will be additional batteries for starting and stopping. The common solution in the mix is ​​to insert an electric motor between the engine and the transmission to assist the power system. However, in this way, the original structure is greatly changed and the cost is naturally difficult to control.

The light mixing is much simpler. It does not have a large battery pack, does not have to change the internal structure of the car body, and it can also assist the instantaneous response of the engine when it starts. At the same time, light mixing can also save energy and reduce emissions without sacrificing the driving experience of a fuel-powered vehicle, improving drive efficiency.

The working mode of Cadillac XT5 28E is:

In start-stop mode: The motor drives the vehicle, the engine does not spray fuel, and the instantaneous 0 fuel consumption.

Acceleration driving mode: Motor and engine work at the same time, energy output is abundant, faster and faster acceleration.

In the constant speed driving mode: the engine is driven, and the excess power is recovered intelligently to charge the battery, which is the next acceleration reserve power.

Why does GM accelerate the update of the 9AT?

Previously, the Cadillac XT5 used the Aisin 8AT gearbox, and Aisin's 8AT reputation in the industry is also good, so why should the Cadillac XT5 28E give up Aisin 8AT?

The reason for this is that most U.S. cars prefer high-speed and smooth engines, which are not good at low speeds. As a result, the speed and torque of the vehicle at the beginning and speed increase are not enough, and Cadillac's power tuning and love The letter 8AT seems to be a little off, and there will be a more obvious sense of shifting frustration at low natural speeds. In view of this, there is no problem with the 8AT and XT5 of Aisin, but the lack of matching between the two.

This time, the tooth ratio of the 9AT and 1-5 gears carried by the XT5 was very dense. This made driving smoother. The 9-speed high speed ratio (1.7x) also provides better fuel economy at high speeds.

In addition, there are two advantages that cannot be seen. The first is the small size, which not only reduces weight, but also brings more space for the layout of the engine room and chassis structure. Second, the oil cooling effect is excellent, making the gearbox more reliable.

Another highlight of this hybrid XT5 is "the increase does not increase the price." The new car price range is 47.99-53.99 million yuan, which is the same price as the existing XT5 28T platinum version. From the configuration point of view, XT5 28E Platinum Edition also has one more mobile phone wireless charging, no difference in other configurations. In addition, the comprehensive fuel consumption of the Ministry of Industry and Information Technology of the hybrid version is 7.9L/100km, which is lower than the 8.7L/100km fuel consumption of the gasoline version.

However, the price of the Cadillac XT5 Light Mix is ​​still somewhat expensive for some consumers. After all, there are many options for this price range, including the BBA's equivalent. Therefore, the XT5 hybrid version has been successful with hybrid solutions for power and fuel consumption. However, if we want to further seize the market, I am afraid we must continue to further study.

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