What is car safety?

Now eating and chatting, when talking about the topic of the car, the younger "player" usually says: "My car, X seconds breaks 100 times, it is faster! You have no play, can't catch up! Look for the venue to run 0-400 for you to see. "When you live, people will say: "My car can save fuel, you see such a traffic jam 100 kilometers only X oil." The new car is like this: "I have tire pressure monitoring, omnidirectional radar, automatic start and stop, etc....." There are a lot of topics about cars. Most people consider the car at the beginning of the car. In addition to their purchasing power, more consideration is given to the appearance, color, functional configuration, etc. of the vehicle. In addition to the appearance configuration, it is more important to forget the safety. This time we will talk about "car safety". topic.

Initial safety

When it comes to car safety, it can be roughly divided into three categories: initial safety, active safety and passive safety. The initial safety is not difficult to understand. Simply put, the initial design of the vehicle is considered at the beginning of the design to reduce the factors that cause the accident. Before starting a car, every car manufacturer will start with the basic performance of the car design and the overall layout of the car body to minimize the unsafe factors that induce collision. A safe car should have a good enough wide field of view, a comfortable and fit seat, a simple and readable instrument, the instrument display interface is concentrated in the center of the line of sight, various buttons reach out, etc. These seemingly inadvertent designs have laid a good foundation for the initial safety of the vehicle.

IIHS 25% small overlap surface collision test, the collision results of the two cars are obvious

Active safety

Active safety is better understood. By manipulating the vehicle, risk can be avoided. This is the most basic active safety. The “Elk Test” tests the vehicle's ability to actively avoid obstacles. The active safety of the vehicle must be inseparable from the assistance of the body stability system. The body stability system of each manufacturer is roughly the same in terms of work, except for the naming, such as "ESP, VSC, VSA, VDC, ESC" and so on. The role of the body stabilization system is to correct or suppress understeer or oversteer when the vehicle is cornering. Understeer, commonly known as the “pushing head” predecessor, usually occurs when cornering at high speeds. If this happens, don’t panic and brake. If you close the throttle, the “control” of the vehicle will return to the new one. In your hands. Excessive steering is commonly known as "appendix". This is usually the case when the rear-wheel drive vehicle is at the corner limit. Compared to the pusher, the tail will come more interesting. Under certain circumstances, the tail will appear in the opposite direction. If the movement is completed beautifully, a so-called "drift" will be completed, but in the domestic rear-wheel drive models, the factory steering setting will be biased towards a slight "understeer" to ensure the stability of the driving. After all, after work, buying and buying food is not so radical. Doesn't the 4WD drive understeer or oversteer? The answer of course is no! Even in the case of full-time four-wheel drive models, in the case of civilian vehicles, understeer or excessive traffic will still occur, but it is better than some of the front or rear drive models.

Active safety In addition to proactively avoiding risks, the braking system is also very important. In the event of a crisis, whether it is dry, slippery or snowy, the car must be stopped and the direction can be freely controlled. A reliable braking system, of course, many vehicles now also match the "brake priority". If the brakes and throttle are pressed at the same time in the panic, the vehicle will not go out, but the default brake will take priority.

BOS: BrakeOverrideSystem, the brake priority system

In addition to proactive risk avoidance and braking systems, major manufacturers have also launched high-tech active safety configurations, pre-crash safety systems, such as Volvo, Audi, BMW, Honda, Subaru, etc. Many manufacturers have their own set of pre-collisions. Security systems, some manufacturers have introduced their own high-tech into the domestic market.

Pre-crash safety systems typically detect obstacles in front of the road (pedestrians, vehicles, or sudden objects) and take the initiative to brake or sound an in-vehicle alarm to alert the driver that each manufacturer has settings on the system. Differently, some systems will tighten the seat belt for the first time when it is determined that the collision cannot be avoided, and emergency braking to reduce collision damage. However, some manufacturers' systems are somewhat passive. When it is determined that the obstacle in front is stationary, the system will brake. Because it is impossible to detect pedestrians or moving objects, the actual use is not satisfactory. The IIHS has a strict set of criteria for determining whether this system is excellent. According to the effect of the collision prevention system, three different levels of evaluations, Superior, Advanced and Basic, have been established. As long as the vehicle is equipped with a standard pre-crash safety system, you can get 1 point, that is, get a Basic rating. Models with a score of 2-4 will be attributed to the Advanced rating, 5 points and 6 points. The score is a Superior rating.

The IIHS will conduct an evaluation on the actual road, allowing the vehicle to drive to the obstacle at a speed of 12 miles per hour (19.3 kilometers per hour) and 25 miles (40.2 kilometers per hour) for a total of five times. Depending on the degree of deceleration of the final collision prevention system, the IIHS will give up to 5 points in the active brake test. In addition, if the vehicle also has a collision warning function, it will receive an additional 1 point, which means that the maximum score of a single model is 6 points. If you want to know the results of the models you are concerned about in the evaluation, please visit the official website of the IIHS to check http://say that the active safety facilities provided by so many vehicles can not guarantee the safety of driving or driving. The person himself, carefully driving the car (ship), obeying the traffic rules is better than any auxiliary facilities.

Passive safety

Passive safety is the last line of defense for vehicle safety. It only shows its importance when a vehicle collides. At the beginning of the design of the vehicle, the responsible manufacturer will create a “steel reinforced bone” for the vehicle, which is what we call the frame. The high-safe frame structure must be able to withstand all-round impact, through dispersion and guarantee The cab does not change and squeezes the inside of the car. When the inside of the car gets out of trouble, the impacted door can be easily opened. This is the basis for passive safety of a car. Such as engine sinking, collapsible steering column, all-round airbags, air curtains, etc. These are essential supporting facilities for ensuring the safety of people inside the vehicle. In addition to the above, the vehicle must be designed with pedestrian protection in mind, minimizing pedestrian damage in the event of an unfortunate collision. Therefore, the car is not safe, and it is not free to press the body by hand.

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