In the field of hybrid power, Honda and Toyota are of course the best, but this mindset often ignores other brands, such as the Korean Hyundai. The new generation Elantra has been released and will be produced in China soon. It is likely to use a hybrid system for the first time in this car series. So what is the difference between the hybrid system created by Hyundai and Toyota and Honda? What about the efficacy? ?
Toyota THS-II?
The core of Toyota hybrid power is the E-CVT, but it is not a traditional CVT structure. It does not have variable diameter wheels and steel belts. Instead, like the planetary gear of a traditional AT, the engine and two electric motors are coupled together through this relative motion mechanical structure to achieve power distribution, thereby eliminating the need for a traditional transmission structure. ?
MG1 is mainly used to generate electricity and can push the car when necessary. MG2 is mainly used to push the car. When to charge and when to drive is determined by the planetary gear, and then output to the wheels through the reduction gear, so it is not so much It's a transmission, it's more appropriate to say it's a main reducer. Toyota was the first to make hybrids, and the actual results are quite good. However, they have also applied for many patents on the planetary gear structure of E-CVT, so they have already opened the minds of car manufacturers such as Honda and Hyundai. ?
Honda i-MMD?
When Toyota first launched THS, Honda actually also had a hybrid, which was still used in the Civic at that time, but the gap between the two was too big. Far. As a Japanese company, Honda also took a fancy to the future direction of hybrids, so Honda had to use its imagination to create the i-MMD now used by Hiroshi and Higashimoto. ?
Strictly speaking, Toyota's E-CVT does not look like a transmission, but Honda does it more directly and the system is simpler. As you can roughly understand from the picture, the generator and electric motor are separated and controlled by a clutch. When the engine joins the drive, only one reduction gear is needed to reach the engine mode. ?
Modern hybrid system?
Unlike Ryota, the modern hybrid system does not cancel the traditional transmission, but it does not mean that the effect is poor. In the U.S. market, the seventh-generation Elantra has two power systems to choose from, one is 1.6L Atkinson direct injection + electric motor + 6-speed dual clutch, and the other is 2.0L Atkinson + electric motor + IVT continuously variable transmission. . ?
Honda’s mechanical structure has become simpler, but behind the scenes it has increased the difficulty of system control. Therefore, the hybrid technology of the seventh-generation Elantra is simpler. The electric motor is directly installed between the engine and transmission through the clutch. , determine the working mode by controlling the clutch. ?
The actual mode is similar to the operation of Liangtian. During the starting and low-speed stages, the electric motor can be completely powered; when power is needed, such as rapid acceleration and uphill slopes, the engine and electric motor work together; during the high-speed driving stage, When the power is sufficient, the electric motor gives priority to power output. When the power is insufficient, the engine provides power while charging the battery. When decelerating and braking, the braking energy can also be recovered. However, since the power of the electric motor is only 43hp and 168N·m, the overall The car's exhilaration and sporty feel are not as good as those of Ryota. ?
Despite the avant-garde appearance of Elantra, in fact it is quite honest. Family use and pragmatism are their positioning. Whether hybrid or complete vehicle, the development direction is towards fuel economy and comfort. In this system, we must mention their engines. The Kappa series machines use Atkinson and direct injection technology. The maximum thermal efficiency of 40% is very close to Toyota. The fuel efficiency given by the United States reaches 50MPG, which is about 4.7L per 100 kilometers. , and the US version of the Corolla hybrid is only 4.5L/100 kilometers. ?
In addition to the fuel-saving engine, work has also been done on the transmission of the seventh-generation Elantra. The transmission matched with the 2.0 is called an IVT transmission. The difference from the CVT is that the former uses a steel chain as a two-wheel transmission. The connection, while the latter is a steel belt, claims that such a change can improve fuel efficiency by 1.2%. ?
Summary?
Is there any difference between Hyundai and Liangda hybrids? Of course, each has its own advantages in terms of structure. The fuel-saving capabilities are very close, and the driving smoothness is probably about the same. However, the advantage of the Liangda hybrid system lies in more advanced power enjoyment. When consumers go to the store to test drive, the first impression is not that of the hybrid system. It is not about the fuel-saving ability of driving, but the hearty feeling brought by power.
This article comes from the author of Autohome Chejiahao and does not represent the views and positions of Autohome.