Geely acquired Volvo and believes that every friend who cares about the car should know about it. However, after many years of acquisition, the Geely brand has never used Volvo's engines on a large scale. Nowadays, the new energy boom is unstoppable, and Geely finally can't stand the big move: show three hybrid systems based on the Volvo 1.5T engine. So how strong is it? We will explain it to you a little bit below.
This issue is about to be related to the relationship between Geely, Lectra and Volvo. First of all, Geely acquired Volvo, but this does not mean that Geely can directly use Volvo's technology, because at the time of the acquisition, there are clear terms on the technical restrictions in the contract: Former Ford requires Volvo not to develop it under Ford. The technology is shared with third parties. In other words, the Volvo acquired by Geely, although a car with dual technology of Ford and Volvo, but the Geely brand can not directly use these technologies when it was just acquired. So, why can the Geely brand now directly use these technologies? This is about the equity relationship between the three companies. Of course, when it comes to this aspect, we will bring together the Geely Group and the space-time equations.
Before that, even if the Drive-E engine did not intersect with Ford, why did the Geely brand not use Volvo's engine products? There are still many reasons for this: First of all, there is a big difference between the positioning of the two brands. If Geely directly adopts the Volvo brand engine, it will inevitably affect the positioning of the Volvo brand; for Geely, if With the Drive-E series engine developed by Volvo, the price of the Geely brand will not be the current level.
However, Geely Group has invested heavily in the acquisition of Volvo. It is impossible to see Volvo's technology not to be used for Geely cars. How to do this transformation? As mentioned above, Geely Group and Volvo jointly established a research and development company called space-time equation. After that, Volvo brought its own SPA architecture platform and Drive-E four-cylinder engine, while Geely Group was responsible for investing money and Volvo. Together with the development of the CMA architecture platform, and optimize the upgrade of the Drive-E series of engines, and then based on the difference between the brand models to make certain differences and improvements, put into the three brands of models to achieve technology sharing.
To sum up, the Geely brand did not use Volvo technology at first because of the earlier exclusion clauses and brand positioning reasons. After that, Geely Group and Volvo jointly established a R&D center to jointly develop and improve the Drive-E engine and CMA platform, and then put them into Geely and Among the Volvo joint ventures of the Lectra brand. Today, the Geely brand needs to use the technical resources of the joint venture R&D center to develop a new hybrid system, thus forming the Geely hybrid system with Volvo technology blessings seen at our auto show.
Light-hybrid system of 1.5T+48V heuristic electric machineThe first Geely hybrid system we are going to talk about is a light-mixing powertrain built on a new 1.5T engine. From a technical point of view, it has the same effect as the new Audi A6 that is currently unveiled overseas: by replacing the 48V inspired electric machine to achieve light mixing, in order to achieve energy-saving and energy-saving effects.
This light-hybrid powertrain technology based on a 48V power system is not really a very advanced technology. This hybrid system belongs to the initial stage of P0 mixing (P stands for PosiTIon, which is the position, and P0 means that the motor is at the front of the engine and connected to the belt tensioner). Simply put, it is passed a higher The voltage and power heuristics reduce the engine load (even under partial taxiing conditions), allowing the engine to start quickly and also function as a charge to save fuel.
This micro-mixing technology has been favored by many European brands at this stage. In China, brands such as Changan and Chery also have this technology reserve. Its advantages are low cost of improvement, good adaptability to the engine, and energy saving and emission reduction technologies that can be effective with a small amount of money. Of course, we have to say that the 48V P0 micro-mixing technology only replaces a heuristic electric machine, and its fuel-saving effect is limited. From the situation we know, this technology can achieve 8%-15 % fuel saving effect.
After talking about P0 mixing, let's take a more complicated hybrid system: the hybrid system of the gearbox integrated motor. As above, this hybrid system is also based on the evolution of a three-cylinder 1.5T engine, but this time we will add a 7-speed dual-clutch gearbox.
This structure is also not complicated, and it shows a high degree of consistency with the CMA platform 1.5T hybrid system display on the Lectra booth at this year's auto show. Both use a 1.5T three-cylinder engine + a seven-speed dual-clutch gearbox, and a drive motor is integrated in the gearbox, paralleled at the output of the gearbox to achieve auxiliary drive, pure electric drive and power generation.
Compared with the hybrid system shown by the Lectra, the hybrid system uses the Miller cycle with an expansion ratio greater than the compression ratio, so in terms of theoretical thermal efficiency, it is higher than the one on the Lectra/Volvo P3 hybrid. The 1.5T engine is more economical. You can see it as the Miller cycle version of the Lectra/Volvo 1.5T P3 hybrid system.
Such a hybrid structure is more mainstream among the European brands. Unlike the P2 hybrid, the P3 hybrid can realize the pure electric drive of “around the gearboxâ€, while the P2 structure is located at the input of the gearbox. Many places are driven by the engine to supplement the torque, etc., nothing to do with the bad, but the logic is different.
1.5T extended range systemAfter talking about the light mix and P3 hybrid system, the powertrain we want to mention in the end is very different from the previous two. Why should I say this? Because in the first two mixed forms, the gasoline engine is directly involved in driving, while the gasoline engine of the extended range system does not directly perform vehicle driving work.
Someone might say: Instead of so tossing, why not let the engine directly drive the vehicle? Will the kinetic energy conversion rate be so low in this transition? On the contrary, since the engine is not directly involved in the drive, the engine does not have a large transmission loss in terms of transmission efficiency, and the work done by the engine can be directly converted into electric energy, and then the power transmission efficiency is high, so the whole system The kinetic energy conversion rate is theoretically higher than the direct drive of the engine, and this is the reason for the long cruising range of many extended-mix vehicles.
From a technical point of view, the three hybrid systems exhibited by Geely are based on Volvo's three-cylinder engine technology. The light-mixing and range-increasing system directly “reproduces†the Lectra/Volvo 1.5T engine on the engine, while in the P3 hybrid, Geely pays more attention to thermal efficiency optimization, using the manifold injection + Miller cycle design. A different point from the Lectra and Volvo engines. Then, these three sets of "internationally-connected" hybrid assemblies, are you as much as I am looking forward to their performance after loading?
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