In the last issue, we dug deep into why Subaru was able to sweep the Top Safety list in the North American IIHS, which is known as the "toughest crash test", becoming the brand with the largest number of TSP+ in a single brand so far. 
As a brand with a mission to make cars that make people feel safe and happy, passive safety is just one of Subaru's strengths. Driven by the brand's mission, Subaru has also developed a number of technologies that improve driving safety, such as EyeSight and S-AWD technology. Eyesight: The originator of pure vision solutions?EyeSight is a unique secret of Subaru, it is the world's first driving assistance system that relies only on binocular stereo cameras to work without millimeter-wave radar, the system recognizes objects through color CCD imaging, simulates human eye behavior, can accurately identify the distance, shape, movement speed of the target object, etc., and can also recognize the braking behavior of the car in front. 
Doesn't it sound a bit similar to the pure visual solution advocated by Tesla?However, Subaru's research in this area was much earlier than Tesla's, as early as 1989, Subaru began to research stereo camera technology, and in 1999 applied the technology to the ADA system of production cars (similar to assisted driving). 
Today, the EyeSight driver assistance system, which evolved from the ADA system, has been iterated several times. Taking the newly launched CrossTrek as an example, it is equipped with the EyeSight driving assistance system, which adds a wide-angle monocular camera for the first time on the basis of the binocular stereo camera, so that the monitoring field of view is wider and greatly improves the recognition range, especially at intersections, it can better identify pedestrians and bicycles in the blind spot, actively brake before the collision, automatically slow down or stop, and protect the safety of people in the car and pedestrians outside the car. 
Of course, the system also covers common assistance functions such as collision prevention, vehicle following assistance, misoperation prevention, lane departure correction and warning warning. If necessary, the system will automatically intervene to apply active braking and even emergency automatic steering to avoid a collision. 
As for the effect, I guess it's working. Eyesight has received the highest rating from the Insurance Institute for Highway Safety (IIHS) and believes that the system is effective in reducing the incidence and severity of collisions. There are also domestic institutions that have compared Subaru equipped with Eyesight with Volvo, Tesla and other products in terms of AEB, and the results are also expected to be excellent. 
Symmetrical full-time four-wheel drive technology: one of the strongest four-wheel driveThere are many kinds of four-wheel drive systems in the world, Honda is called SH-AWD, Audi is called Quattro, BMW is called Xdrive, Mercedes-Benz is called 4matic, and there is also a unique four-wheel drive system called left-right symmetrical full-time four-wheel drive. See "left-right symmetry", as the name suggests, it is another core technology extended from Subaru's boxer engine, and it is also the full-time four-wheel drive that everyone talks about. 
The system dates back to 1972. At that time, four-wheel drive was only used for off-road or professional models, and for family users living in icy and snowy areas and mountainous areas, a civilian four-wheel drive vehicle that could improve passability was a market gap at that time.
Seeing the business opportunity, Subaru began to develop the full-time four-wheel drive system in 1965 and installed it on the Subaru Leone Estate Van 4WD, which happened to meet the popularity of skiing and fishing in the world, so the Subaru brand and its horizontally opposed engine + full-time four-wheel drive technology became famous, and in 1974 Subaru began to export products to North America, the most popular of which is the Leone Estate Van 4WD. 
It was not until many years later in the 80s that the full-time four-wheel drive system began to become popular in the field of civilian production cars, and the famous Audi quattro was born in 1980, and it can be said that Subaru is one of the originators of civilian four-wheel drive.
Today, symmetrical all-wheel drive has become synonymous with Subaru, and every model in the company (except the BRZ) bears this iconic brand.
So what's so unique about this four-wheel drive system?To put it simply, the characteristics of the left and right symmetrical full-time four-wheel drive are that the horizontal opposition engine, symmetrical gearbox, ** differential and front and rear axle differential and other components are symmetrically arranged along the center line of the body, so as to achieve the symmetry of power transmission and torque distribution. 
In addition, compared to a transverse engine all-wheel drive system that puts weight on the front axle (the engine and transmission are placed in front of the front axle, resulting in too much weight concentration at the front of the vehicle), Subaru places the transmission and transfer case behind the front axle to achieve an ideal weight balance, and the weight distribution of most Subaru models is close to 50:50.
Based on the low center of gravity of the horizontally opposed engine, coupled with the symmetrical full-time all-wheel drive system, each wheel can obtain torque that matches the load, giving the driver a stable sense of security on snow-covered roads and other adverse road conditions.
Like the all-wheel drive systems of major brands, Subaru's symmetrical full-time all-wheel drive system has evolved into a variety of forms after more than 50 years of development, mainly active torque vectoring AWD (ACT-4), variable torque vectoring VTD-AWD, and the most famous DCCD.
dccdIt is Subaru's strongest full-time four-wheel drive system, and it is also a product of rallying, and is mostly used in racing cars and STI high-performance models.
DCCD stands for Drivers Control Central Differential, which literally translates as a four-wheel drive system for driver control differentials. As the name suggests, the most important feature is that the torque distributed to the front and rear axles can be manually adjusted, from the default 41:59 to 50:50, which is useful for providing greater flexibility and customisation in different road conditions, track conditions or driving styles.
In addition to the manually dispensable ** differential, the all-wheel drive system is equipped with two limited-slip differentials at the front and rear (mechanical spiral at the front and Torsen at the rear). The implication is that it can distribute torque not only between the front and rear wheels, but also on the left and right wheels automatically to adjust the vehicle's turning back in corners and the traction gained when accelerating through the corner. In the WRC field, DCCD can be described as a bug, and with its blessing, Subaru has won 47 WRC championships. Players generally agree that the Subaru DCCD is more powerful than Audi's Torsen-style quattro.
vtd-awdIt can be understood as a simplified version of DCCD, and the difference in positioning can be seen from its installation on the WRX. VTD-AWD (Variable Torque Distribution) literally translates to variable torque distribution full-time four-wheel drive system, although it is equipped with three sets of front, middle and rear limited-slip differentials to achieve torque distribution, but the biggest difference between it and DCCD is that it cannot manually distribute torque to the front and rear wheels.
The system has a 45:55 torque distribution between the front and rear wheels under normal conditions, and still has the driving characteristics of a rear-wheel drive car. The system senses the opening and closing of the accelerator pedal, the engine speed, the difference in rotation of the drive wheels, etc., and when the rear wheels start to slip, more power is distributed to the front wheels to suppress the idle of the rear wheels. Together with the LSD limited-slip differential on the rear axle, the system is the same high-performance orientation. Compared to DCCD, the structure is a little simplified, but the cost is still high. Whether it is DCCD or VTD-AWD, it can be said to be the existence of the ceiling level in the road four-wheel drive system. act-4It can be understood as a four-wheel drive system at the level of a civilian car, and is generally installed on the current Subaru family CVT model. ACT-4 (Active Torque Split AWD) literally translates to Active Torque Full-Time All-Wheel Drive System. Compared with DCCD and VTD, this system is relatively simple, only using the first differential with electronically controlled multi-plate clutch structure, and the front and rear axles are open differentials.
This system was born in the 90s of the last century, and its normal front and rear torque distribution has gradually evolved from the original 20 to the current 60:40. The torque on the front and rear axles can be distributed in different road conditions and driving conditions. For example, when accelerating, cornering and getting out of trouble, the torque between the front and rear axles is automatically distributed between 60:40 and 90:10. Brings a more stable driving experience. In order to improve the system's ability to get out of trouble, Subaru also matched it with X-Mode mode, which is mainly through the electronic control system to increase the compression force of the multi-plate clutch, which can increase the torque of the rear wheel by an additional 25%, and theoretically can achieve a 50:50 distribution ratio, thereby increasing the ability to get out of trouble.
In addition, the latest X-Mode is also subdivided into two modes. The "Snow Dirt" mode for snow, dirt roads, or gravel-covered roads, and the "Deep Snow Mud" mode for deep snow, mud, or dry soil achieve more precise torque distribution. Thanks to Subaru's powerful full-time four-wheel drive system, the brand has been popular with consumers in some high-latitude regions and mountainous areas, which is exactly the same as the original intention of Subaru when it launched its first full-time four-wheel drive product
As we have always said, as long as there is something in a certain field and is recognized by a specific group, it is a brand that deserves to be respected. Is Subaru a brand you recognize?