Black technology, a small test of fuel consumption of Toyota dual-engine commuting

　　The Ralink and Corolla engines, which were listed at the end of October last year, are still in short supply until this year. The heat of a car can last for nearly one year, which can be said to be rare in the domestic automobile market. It is not only the "queuing to pick up the car" in the 4S shop, but also many questions about these two cars and even Toyota’s hybrid technology in the private letter of @ Auto Black Technology. A few days ago, I was lucky enough to borrow a Ralink twin-engine, known as the "150,000 fuel-efficient king". This time, I can finally see how to save fuel!

　　Before writing the technical principle, let’s actually see if the fuel consumption of Toyota’s twin engines can really be as low as the official 4.2L per 100 kilometers. As we all know, the fuel consumption of the Ministry of Industry and Information Technology is actually a cover. Someone asked me how high the real fuel consumption of a car is. I generally suggested adding 30% to the fuel consumption of the Ministry of Industry and Information Technology to be more reliable data. Did Leiling Shuangqing follow this routine?

　　Summary:

　　A small regret of this test is that I didn’t have time to fill up the car again in the end and calculate the comprehensive fuel consumption. Because considering the test drive in these two days, quite a few working conditions of the car are extremely extreme, such as stepping on the floor oil for 10 times in a row on an open road to experience acceleration and stopping at idle speed for a long time, etc., the comprehensive fuel consumption calculated in this way is of little reference significance. After two days’ test drive, I ran 150km in various road conditions and driving modes, and finally the indicator of the fuel gauge dropped by half, which is just over 1/8, so the comprehensive fuel consumption of these two days is between 4.1 and 4.4L..

　　Regarding the fuel consumption of the twin engines, many netizens on the forum are arguing. Many car owners are calculating their fuel consumption and how much money is left all day. In fact, I don’t think it is necessary, because this car is really fuel-efficient! Somebody else’s car with a displacement of 2.0L often uses 9 or 10 petrol, and the better one is 8. No matter how hard you play, your hybrid twin-engine can’t reach 6, and even if the conditions are good, it can reach less than 4, without considering the charging problem. It’s really unnecessary to calculate the fuel consumption all day!

　　In terms of technical principles, I can write a book when I spread it out. I will try my best to make it clear in the most straightforward way with the questions that everyone is more focused on.

　　Q: Why is Toyota Twin Engine so fuel efficient?

　　A: in a word, it isIf the engine can not be started, it should not be started. Even if it is started, it should try to operate in the most efficient load range.

　　First of all, the 1.8L Atkinson engine, code-named 8ZR-FXE, which is equipped with Ralink Twin Engine, has reached 38% of its own thermal efficiency, which is beyond the reach of most manufacturers. Although the maximum power of the engine is 73kW and the maximum torque is only 142Nm, it is definitely not enough for the hybrid car to only look at the engine parameters. The special adjustment has brought the engine a wide and efficient operating range. Simply put, it is a high fuel efficiency engine that is "specialized" for hybrid power.

　　Secondly,Look for every opportunity to recharge the battery.. As soon as the engine is started, it will immediately charge the battery (and drive the vehicle at the same time), and the energy recovery after loosening the throttle can also convert the mechanical energy of the car into the electric energy of the battery. Although the battery capacity of Toyota Twin Engine is only 6.5Ah, you will find that the power seems to be never used up. Even if the battery is running out, the efficient Atkinson engine will start to charge the battery.

　　Q: Why does it drive so smoothly?

　　A: This involves the core of dual-engine technology-E-CVT power distributor and PCU power control unit.

　　The core mechanism of power distribution of Shuangqing is a planetary gear set, which is very clever in idea and brain-burning in principle … In the power distributor, the outermost ring gear of the planetary gear set is connected with the motor, which is directly responsible for driving the vehicle, while the engine is connected with the planetary gear, and a motor is connected with the central sun gear.

　　Putting aside the complicated power distribution and just talking about ride comfort, because the gears in the planetary gear set are in a state of constant meshing, whether it is motor drive, engine drive or two power sources driving the vehicle together, it does not involve the combination of teeth. Even if you start to accelerate at full throttle and the engine starts to intervene, the planetary gears start to revolve. At this time, because the planetary gears are in constant meshing, it will not bring any sense of frustration. This is why Toyota’s twin-engine models can achieve the same ride comfort experience as CVT models.

　　As we mentioned earlier, the engine will be forced to start at 50km/h when the Ralink dual engine is running, because the reverse speed of sun gear motor has reached the limit at this time, and the engine must be started to reduce the reverse speed of sun gear motor, so that the vehicle speed can continue to increase. The following is the video of the engine starting in pure electric mode after the car slowly accelerates from standstill to 50km/h:

　　Q: Why can Corolla/Ralink engines be sold so cheaply?

　　A: To tell the truth, this problem is not limited to the technical level. The low price range of 139,800-159,800 yuan can be sold by Leiling Shuangqing. First of all, it is the localization of hybrid hardware.

　　As far as you can see, this iron knot is the core of THS-II, which has been designed, developed and gradually improved by Toyota engineers for more than ten years. It includes a motor, a charging motor and planetary gear sets.

　　In order to make the guide price of Corolla/Ralink engine as grounded as possible, the localization rate of this iron pimple has reached more than 90%. What concept can I tell you that only three things in this picture are imported from Japan:The charging coil, driving motor coil and planetary gear set, and the rest of the shell, shaft/bearing and actuator are all made by domestic suppliers.Of course, we are looking for parts suppliers that meet Toyota’s manufacturing standards, and Toyota sent its own engineers to follow up the development in the early stage of research and development. In addition, hardware such as battery pack, PCU and BMS are almost 100% made in China.

　　Q: Is this dual-engine technology at ease?

　　A: I feel that the technology is complicated and I am not at ease? In fact, since the first generation Prius, the cumulative sales of Toyota’s hybrid technology models have exceeded 8 million units in the world, and Toyota’s hybrid models have been running all over the world. For more than ten years, Toyota’s hybrid has never made any mistakes in core components. If you are not at ease, take the Corolla Twin Engine as an example. At the beginning of listing, in order to let consumers try hybrid technology, manufacturers even decided that cars booked before 2016 can enjoy a five-year and 140,000-kilometer vehicle warranty. In terms of battery packs that consumers are particularly concerned about, at present, Toyota’s two dual-engine models in China can enjoy the warranty of 8 years and 200,000 kilometers. It is likely that you will drive to the day of changing cars, only to find that the battery warranty has not passed …

　　Q: why can’t I buy it?

　　A: It’s normal that you can’t buy it, because of the limitation of production capacity … Now Toyota’s twin engines are still in a relatively hot state, and the 4S shop is basically out of stock. If you come to one, you will take one away. In some places, before the two cars went on the market, orders were already scheduled for the beginning of this year. At present, the production capacity of the core components of Shuangqing in Changshu is about 20,000/year (still climbing), so it is understandable that the demand in various places is in short supply. Of course, this also depends on the region, and it does not rule out that there are sufficient car sources in some places.

　　Q: What are the shortcomings of the dual-engine technology in experience?

　　A: Yes, the main reason is that the excitation sound of the motor is not so good when it is accelerating rapidly, and the sound of the engine at high speed is not so good. However, excitation sound, a phenomenon that almost all hybrid vehicles can’t completely avoid, can only be seen by who does better sound insulation. In addition, as to whether the jitter at the moment when the engine starts will be the same as the start and stop of an ordinary car, my experience is that you can feel it when the engine starts at rest, but you can’t feel it when you are driving, unless you stare at the energy monitor on the dashboard.

　　In the past two months in Beijing, there have been more and more Corolla/Ralink dual engines on the road, which shows that even though the dual engines cannot be included in Beijing’s new energy list due to wonderful policy reasons, a considerable number of consumers who have worked hard to shake down the number have chosen the dual engines.

　　At the beginning of the listing of Corolla/Lei Ling, I once contacted someone from Toyota China Marketing Department and asked him how he could make money with such a low guide price. The other party said that in fact, Toyota introduced hybrid technology into China and now it doesn’t want to make money at all. Later, I understood that as the first person to eat crabs, there are some things that must be paid. If the Corolla/Ralink twin-engine cars don’t have a price close to the people, I’m afraid Toyota’s hybrid road in China will never work. Thanks to Toyota’s "biting its teeth and stamping its feet", we can buy a twin-engine car with lower fuel consumption with the money of the ordinary version of Lei Ling.

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