Subaru, the technical house, is finally starting from "strong mixing"

65438+20201October 20th, Subaru held a technical briefing for relevant media. ミーティング "(Subaru Technical Conference). The reason for holding this technical briefing is to explain its technical development direction in the future 10, the new technologies to be carried by some products to be released soon, and the goals that Subaru hopes to achieve in the future.

At the beginning of the technical briefing, President Tomomi Nakamura delivered a speech on the stage, saying that Subaru's goals include "achieving zero accident deaths (in traffic accidents related to Subaru cars) by 2030"; "Electric vehicles (BEV) and hybrid electric vehicles (HEV) account for more than 40% of global automobile sales" and so on. At the same time, it also emphasizes that "even if electric goods are provided, it will continue to ensure the unique characteristics of Subaru."

After generalizing, the explanation turned to Subaru? Special executive? CTO？ Hosted by Tetsuo Oshima. Next, Dayuan's special agent introduced the specific commodity plan. Specifically, the plan disclosed this time is basically the same as when STEP was published in July 20 18, but Subaru provided more detailed information in the field of HEV.

Legend: Subaru's newly developed 1.8L horizontally opposed direct injection turbocharged engine will be mass-produced this year, and its maximum thermal efficiency is about 40% (under the existing technical conditions, it is more difficult for turbocharged engines to reach this maximum thermal efficiency level than NA engines due to pumping loss under some working conditions). It will first be used in the next issue of LEVORG published and sold in the Japanese auto market in the second half of this year.

Except for what we all know before: BEV (battery electric vehicle) announced the C section jointly developed with Toyota in 202X (that is, around 2022 ~ 2023). SUV (that is, the same level as Subaru Forester and Toyota RAV4); In 2020, the newly developed 1.8L horizontal turbocharged direct injection engine with a maximum thermal efficiency of about 40% will be put into the engine car field (this engine will be put into the next LEVORG sold in the Japanese domestic automobile market in the second half of 2020), and it is clear that the strong hybrid car will be put into use in the first half of 2020. HEV, that is, "SHEV" written in the above picture-other car manufacturers also call this hybrid car "FHEV"? )。

Specifically, according to the existing plan, the SHEV to be invested in the future will be invested at some point before 2025, and the investment time will be longer than the C-class car jointly developed with Toyota mentioned above. The SUV is slightly behind. And its hybrid system will adopt a plug-in hybrid vehicle (PHEV)「Crosstrek "similar to the one sold by Subaru 20 18 in the North American market. Hybrid is a THS-II hybrid system provided by Toyota, not a mild version? "e-BOXER" hybrid power system developed by Subaru Zishe in the hybrid field.

Legend: Subaru "Crosstrek? Hybrid's hybrid system "THS2A" was not shot at this press conference, but at the "Man", "Man", "Man" and "Man" held in May 20 19. Hengbang "

Plug-in hybrid vehicle (PHEV)cross trek? Hybrid, whose plug-in hybrid system is also called THS2A, is based on Toyota's current version of Prius? THS developed by PHV? II "hybrid power system is modified to adapt to two unique features of Subaru:" horizontally opposed engine vertical installation "and" symmetrical full-time four-wheel drive system "(symmetrical? AWD).

Legend: Subaru "Crosstrek? Hybrid "uses the center of" THS2A ". The front part (front direction, i.e. the upper right part of the picture) MG 1 and the rear part (rear direction, i.e. the lower left part of the picture is divided into partial coils) MG2 are provided by Toyota, and other parts, such as planetary gear sets, are designed by Subaru alone.

Subaru fully adheres to the above two points for the following reasons: the horizontally opposed engine installed vertically and at a low height can ensure that the center of gravity of the vehicle is low and basically balance the mass distribution on the left and right sides of the vehicle; On the basis of these characteristics, the optimal torque control can be realized by using the 4WD system which fully considers the front and rear mass distribution, and the driving safety and passability of the vehicle can be improved.

In addition, in Crosstrek? Hybrid "and the new SHEV to be announced and mass-produced in the future, the former adopts Subaru's 4WD technology, and the latter will also adopt this technology. It can be said that Subaru's advantage in the PHEV/HEV field lies not only in this unique "symmetrical full-time four-wheel drive system" (symmetrical? AWD). In order to give full play to Subaru's unique advantages, a special horizontally opposed engine for hybrid vehicles will be specially developed on the basis of the new generation horizontally opposed engine mentioned above.

Thanks to the symmetrical full-time four-wheel drive system (symmetrical? AWD) structure, that is, the front and rear axles are physically connected by a transmission shaft and a coupling mechanism (カップリング mechanism). Compared with FF (front engine, front wheel drive) vehicles, or 4WD vehicles based on FF vehicles but with electric motors on the rear axle to realize 4WD, in

At the same time, when Subaru's 4WD technology is applied to HEV and PHEV, the energy recovery can be increased by up to 30% under various driving conditions and road conditions. However, if the 4WD scheme based on FF vehicle and adding a motor on the rear axle to drive the rear wheels is adopted, based on the technical level of existing automobile manufacturers, there will be a "delay of hundreds of ms" between the detection of wheel slip and the optimal torque adjustment, so this part of energy cannot be effectively recovered, and the rapid optimal torque distribution cannot be realized, which will further affect the handling performance of the vehicle.

This article comes from car home, the author of the car manufacturer, and does not represent car home's position.