I received a message from readers a few days ago, hoping that Che Jujun would talk more about technical things. Especially want to know about eMG? This set of plug-in hybrid system adopted on 6, which can cooperate with the map to plan the navigation energy path, is very easy to use.
actually, eMG? In just three years, the company has made two changes. The new model was released in September this year. The official promotion is the third generation PHEV model. What kind of magic does it have? Let Che Jujun take everyone to have a look.
First, the first generation of EDU hybrid system, the attempt of parallel connection
Although eMG? 6 was only listed in April 218, but as early as 213, SAIC obtained the related patents of the first generation EDU electric drive system. In 217, SAIC's new energy EDU electric drive hybrid system won the China Patent Excellence Award, and also won the National Science and Technology Progress Award. It can be seen that this technology is still recognized by the upper level. ?
this system is a typical series-parallel structure, which has two motors and two clutches. The ISG small motor works with the engine. When the power output of the engine is insufficient, this small motor makes some torque compensation, and the TM large motor plays the main electric driving role. Then the energy output from these two ends is output through a 2AMT two-speed coaxial transmission.
in this system, the small motor is mainly used for speed regulation, while the large motor is responsible for driving and kinetic energy recovery. It can work at the same time or be disconnected separately.
but at the same time, it can also be switched to serial mode. That is, the clutch on the ISG motor side is cut off, and it is no longer responsible for power output, but generates electricity for the power battery through engine driving, and then sends it to the TM motor for work.
compared with the PHEV system of most other car companies, only one motor output is added to the gearbox, and then the original fuel system is used, and some hybrid coupling is added. The system of SAIC is still innovative, which can realize pure electric drive, pure fuel drive, hybrid drive and extended-range drive.
moreover, unlike other new energy vehicles with a single-speed gearbox, it is also equipped with a two-speed gearbox, which can be upshifted if the vehicle speed keeps rising, so that both the engine and the motor can maintain a relatively efficient operating range.
However, the shortcomings of this system are obvious. Firstly, the structure is really complicated, two clutches and two systems are in parallel, and there is also the problem of gear shifting of the gearbox, which will bring some frustration from time to time.
in addition, SAIC has equipped it with a 1.T three-cylinder engine, but this engine itself is not highly efficient. Therefore, it can be used as a power source to drive ISG motor to charge the power battery, which is not comparable to the Atkinson engines of Toyota and Honda. As a driving mechanism, its power of 92kW is slightly insufficient.
therefore, this system will rely more on the motor as the power source, that is, it will consume more power. However, its own pure electric cruising range is only 53km, and the battery energy is only 9.1kWh. After feeding, the advantages of this system are not obvious.
the first generation system has many advantages, such as the cooperation of double motors and engines, with the maximum output torque reaching 622Nm, and the extended-range mode, which can save fuel to some extent even if power is fed. However, its lifting space is relatively small, and its layout space is stretched by the structure of double clutches, so it is difficult to upgrade the 1.T three-cylinder engine. However, if this engine takes both efficiency and power into account, its power output will be damaged, and its efficiency will be average, losing the original intention of the hybrid car.
second and second generation EDU, "true" 1-speed AMT
eMG in 219? On the 6th, SAIC switched to the second generation EDU hybrid system, and the sense of inheritance between the new generation system and the first generation system was not obvious. Compared with the double-motor arrangement of the first-generation system, the second-generation system adopts the arrangement scheme of single motor+single clutch. That is, only one clutch is reserved at the engine end, and the TM motor is directly connected to the gearbox.
in terms of control idea, the first generation system is closer to Honda's i-MMD system, that is, the control is divided into several different working conditions, and the efficiency will naturally go up by using more electricity and less oil as much as possible. The logic of the second generation system is closer to Toyota's THS system, that is, through different combinations, the combination with more efficiency or the best power output is selected.
the difference is that Toyota is controlled by an E-CVT planetary gear set, which determines how to split the power. E-CVT also means electronic stepless speed change, which means that countless power combinations can be realized. Of course, in fact, Toyota adopts different logic control for almost a dozen different working conditions.
the second generation EDU of SAIC is controlled by a 1-speed AMT gearbox. This gearbox gives the engine six different speed ratios and the motor four different speed ratios. That is to say, theoretically, the engine has six different gear outputs and the motor has four different gear outputs. Then this power system will have "6×4=24" power combinations. Of course, according to the actual working conditions, there may not be so many power combinations, and it is unclear how many power combinations will be used in the end.
This system has great advantages over the first generation. The most obvious thing is, of course, after "subtracting" a motor and a clutch, it leaves more room for the engine, so the 219 eMG? 6 is equipped with a 1.5T engine with a maximum power of 124kW. Although the total torque output by the whole engine has dropped from 622Nm in the first generation to 48Nm in the second generation (after all, there is one motor missing), the overall acceleration performance of the new car has not decreased through the adjustment of power coordination logic.
even if the battery is not so sufficient, this new 1.5T engine drives eMG? 6 Such an A-class car is also comfortable, which greatly improves the overall driving experience of users. This is much more practical for many users who "only seek green cards" and do not have charging conditions.
and most importantly, this system leaves more room for imagination. When you have "6×4" power combinations, the rest can be continuously optimized through continuous trial and error. Moreover, its relatively simple structure can improve the performance simply by increasing the battery capacity and increasing the motor efficiency, and the 1.5T engine, as the key assembly of SAIC, will definitely continue to improve in the future.
the third and third generation eMG? 6, independent leading level < P > In September this year, the third generation of eMG? 6 release, the second generation system is used in the overall architecture, but some targeted improvements have been made. Mainly the increase of batteries and the progress in adjustment.
according to the core parameters, 219 eMG? 6 Compared with the 218 model, the change is earth-shaking. Although the vehicle size and battery capacity remain unchanged, a 1.5T four-cylinder engine and a 1-speed automatic transmission have been replaced, and the overall control logic has changed greatly. The pure electric cruising range of the Ministry of Industry and Information Technology has been reduced from 53km to 51km.
but in fact, the second generation system has greatly improved the actual use in China. First of all, it is natural that the engine is more powerful and less dependent on the battery. If the first generation system is only suitable for users who have charging conditions and commute to work, the second generation system is closer to the two-field hybrid model, and the hybrid efficiency is high enough, and the continuous feed running efficiency is not bad.
the officially declared third generation is actually an extension of the second generation system, and it is still the same 1.5T engine, but the battery is increased to 11.1kWh, and the pure electric cruising range is increased to 7km. From the perspective of promotion ratio, the overall driving efficiency of the third generation model is better than that of the previous generation.
according to SAIC's official data, a new generation of eMG? 6 The fuel consumption under working condition B is 3.9L/1km. What is the B working condition, that is, the power percentage is less than the SOC setting value, and the engine starts to intervene in the feed state. This is the time to test the system's "power conservation" ability, and this fuel consumption can be achieved, which shows that the efficiency of SAIC is still very high.
and although the official claim is the third generation? MG6? PHEV, also with the third generation MG? 6 at the same time, launch a new one. Unfortunately, the engine it is equipped with is still the second-generation model, and it is not equipped with the latest MG6 15C4E engine, otherwise the efficiency should be further improved. Maybe SAIC means to save it for the next change. Considering the current sales of hybrid models, it doesn't want to invest so much at once.
fourth, PHEV super brain, another direction of intelligent driving?
at the beginning, it was mentioned that some readers were amazed at the ability of combining this system with maps and found it very easy to use. What's the matter? This is from eMG? 6 HCU intelligent hybrid central controller.
it can perform the following actions through the controller. besides adjusting the power system, it can also perform intelligent identification of road conditions, data navigation and energy path planning, and can also summarize the trip and quantify the benefits. In theory, this system can control all aspects, plan the route according to the road conditions, plan the energy distribution, that is, how to cooperate with electricity and oil, and summarize after the trip is completed, and the system can complete self-learning.
officially speaking, IEM intelligent energy management is based on maps and radars, which directly combines the user's trip with the power and power distribution of the system, but the specific degree of completion is still unknown. However, judging from the feedback from readers, it seems to be more useful.
personally, this can become a new direction of new energy vehicles. After all, the mileage anxiety of new energy vehicles is objective. Although PHEV vehicles do not rely entirely on batteries, their efficiency is greatly reduced when there is no electricity. Doing a good job in energy planning can greatly alleviate this problem.
summary of vehicle gathering
under the pressure of national policies, the technology of new energy vehicles has shown an explosive trend in recent years. Three years ago, we were still cheering for the cruising range to exceed 4km, and now there are models that can achieve cruising range of 7km+. Strong mixing, light mixing and plug-in mixing are also developing simultaneously. From eMG? Judging from the development in recent years, it can be said that it is step by step. At present, it seems that the next development direction has been found, which will increase the output sales of the engine and improve the overall driving efficiency of the system.
However, in Che Jujun's view, if it is not for the green brand, the PHEV model is still not recommended, after all, the price is high. eMG? The price of the new energy version is more than 4, yuan higher than that of the ordinary version, and it is also higher than that of the Toyota/Honda hybrid A-class car. The hybrid system of the two fields is not only more mature, but also adopts the technology of shallow charge and shallow discharge, and the battery capacity is only over 1kWh. The power battery has low cost and longer service life. To experience the same situation, the preservation rate and later cost advantages are great.
if you really want to choose a PHEV model, eMG? 6 seems to be fairly good year-on-year, at least our compatriot Roewe i6 new energy still uses the previous generation system.
This article comes from the author of Chejia, car home, and does not represent car home's standpoint.