Balloon spring.
The clock spring is used to connect the main airbag (the one on the steering wheel) to the airbag harness, which is basically a piece of wire harness. Because the main air bag should rotate with the steering wheel, (it can be imagined as a wire harness with a certain length, wrapped around the steering wheel steering shaft, when rotating with the steering wheel, it can be reversed or wound more tightly, but it also has a limit, to ensure that the steering wheel to the left or right, the wire harness can not be pulled off), so the connecting wire harness should leave a margin. Make sure the steering wheel turns to the side to the limit position without being pulled off. This point in the installation is special attention, as far as possible to ensure that it is in the middle position.
Product introduction
When the car crashes, the airbag system is very effective in protecting the safety of the driver and passenger.
At present, the airbag system is generally a single airbag system of the steering wheel, or a double airbag system. When a vehicle equipped with dual airbags and seat belt pretensioner system crashes, regardless of the speed, the airbags and seat belt pretensioner operate at the same time, resulting in the waste of airbags during low-speed crashes, which increases the maintenance cost a lot.
The two-action dual airbag system, in the event of a crash, can automatically choose to use only the seat belt pretensioner or the seat belt pretensioner and the dual airbag at the same time according to the speed and acceleration of the car. In this way, in the event of a crash at low speed, the system can only use seat belts to protect the driver and passenger safety, without wasting air bags. If the speed is greater than 30km/h in the crash, the seat belt and air bag action at the same time, in order to protect the safety of the driver and passenger.
Working principle
When the car is in a head-on crash, the airbag control system detects the impact force
(deceleration) exceeds the set value, the airbag computer immediately connects the electric explosion tube circuit in the inflator, ignites the ignition medium in the electric explosion tube, and the flame ignites the ignition powder and the gas generator, producing a large amount of gas at 0. Within 03 seconds, the air bag is inflated, the air bag expands sharply, breaks through the decorative cover drum on the steering wheel to the driver and occupant, so that the driver and occupant's head and chest are pressed on the gas-filled air bag, cushioning the impact on the driver and occupant, and then releases the gas in the air bag.
The airbag can evenly distribute the impact force in the head and chest, preventing the fragile passenger body from having a direct collision with the body, greatly reducing the possibility of injury. Airbags do protect passengers in the event of a frontal impact, even if the seat belt is not worn, anti-collision airbags are still effective enough to reduce injuries. According to statistics, in the event of a frontal collision with a car equipped with airbags, the degree of passenger injury can be reduced by up to 64%, even in 80% of those passengers are not wearing seat belts. Collisions from the side and rear seats still depend on the function of the seat belt.
In addition, the volume of the explosion of the air bag is only about 130 decibels, which is within the tolerable range of the human body; 78% of the gas in the air bag is nitrogen, which is very stable and non-toxic, harmless to the human body; The powder brought out when the explosion is a lubricating powder that maintains the air bag in the folded state and does not stick together, and is harmless to the human body.
Everything is a double-edged sword, and the airbag also has its unsafe side. According to calculations, if the car is traveling at 60km /h, the sudden impact will make the vehicle stop within 0.2 seconds, and the air bag will pop out at a speed of about 300km/h, and the resulting impact force is about 180 kg, which is difficult to bear for the head, neck and other vulnerable parts of the human body. Therefore, if the Angle and strength of the airbag pop out is slightly wrong, it may cause a "tragedy".
In the car, the three sensors constantly input the information of the speed change to the electronic controller, the electronic controller constantly calculates, analyzes, compares and judges, and is ready to issue instructions at any time. When the speed is less than 30km/h, the front sensor and its connected safety sensor simultaneously input the crash signal to the electronic controller, and send the command to detonate the electric detonator of the seat belt pretensioner, while the signal sent by the central sensor cannot make the electronic controller send the command to detonate the electric detonator of the air bag. Therefore, in the case of low-speed (small deceleration) collision, as long as the pre-tensioner pulls the seat belt back, it is enough to protect the driver and passenger from crashing into the front.
In the case of high-speed (large deceleration) collision, the front sensor and the central sensor simultaneously input the collision signal to the electronic controller, the electronic controller issues an instruction after a quick judgment, and detonates the electric detonators of the left and right pretension and double air bags at the same time. When the seat belt is pulled back tightly, the two air bags open at the same time to absorb the impact energy generated by the driver and the passenger due to the large speed reduction, effectively protecting their safety.
When the car collides with the fixed object in front of it, the faster the car is traveling, the greater the deceleration, and the more force the sensor receives. If the pre-set force of the front sensor and the central sensor is divided into upper and lower limits, that is, the predetermined impact speed of the front sensor is less than the lower limit value of 30km/h, and the corresponding preset value of the safety sensor is also the lower limit value, then the electronic controller only causes the seat belt pretensioner to detonate when the car crashes at low speed. If the preset value of the central sensor is the upper limit, when the car crashes at high speed, the front sensor, the central sensor and the safety sensor simultaneously output the collision signal to the electronic controller, and the electronic controller detonates all the electric detonators, then the seat belt is strained and the air bag is opened.
From the collision, the sensor sends a signal to the controller determines to detonate the electric detonator, about 10ms time. After detonation, the gas generator produces a large amount of nitrogen, which quickly inflates the air bag. From the collision to the formation of the airbag, and then to the tightening of the seat belt, the whole process takes 30-35ms, so the protection effect of the airbag system is very good.
When the airbag detonates, due to the large amount of gas generated into the airbag, the pressure of the airbag increases, which is not conducive to absorbing the impact energy, so there are two gas discharge holes in the back of the airbag to discharge the pressure, which is conducive to protecting the safety of the driver and passenger.
As an auxiliary configuration of the passive safety of the body, people pay more and more attention to it. When the car and the obstacles collide, it is called a collision, the occupant and the car components collide, called a secondary collision, the air bag in a collision, the second collision before the rapid opening of a gas-filled air cushion, so that the occupant because of inertia and move "on the air cushion" to mitigate the impact of the occupant and absorb the impact energy, reduce the degree of injury to the occupant.
Airbags have been rapidly developed in recent years, the price has dropped significantly, and the car equipped with airbags has also developed from the past middle and senior cars to middle and low cars. At the same time, some cars are equipped with passenger airbags in the front row (that is, dual airbag specifications), and passenger airbags are similar to those used by drivers, but the volume of the air bag is larger and the gas required is more. Since the 1990s, the safety performance of the airbag has been generally accepted, and is regarded as a modern and high-grade safety device. Understanding the working principle of the airbag and matters needing attention are very important for us to better protect ourselves, but for the driver, safe driving is the first, which is no advanced safety device can be replaced.
Car air bag spring is broken, will there be a fault code?
will
Car air bag hairspring is broken, there is a trouble code.
When the car's air bag spring fails, the vehicle's safety system will detect the anomaly and indicate the specific location of the problem by setting a fault code. These fault codes can help maintenance personnel quickly and accurately locate the problem, so as to carry out the corresponding maintenance. For example, a broken air bag spring may report multiple fault codes, including but not limited to C0506 - Driver Side Airbag Control Module (NSCM) failure, U0101 - Airbag System (SRS) failure, B1001 - Driver Side Airbag (D-SRS) failure, etc.
In addition, the damage of the air bag spring may also be manifested as the air bag fault light, the horn does not sound, and the multi-function steering wheel button failure. Therefore, if the vehicle has these symptoms, the driver should be checked in time to determine whether the air bag spring needs to be replaced.
In the process of maintenance, it is a common diagnosis method to read the fault code with the fault diagnosis instrument. In this way, it can be determined whether the air bag spring is damaged. For example, by unplugging the air bag spring and using a 2 to 3 ohm resistor to replace the air bag spring, and then re-reading the fault code, if the fault code disappears, the air bag spring may be damaged.
To sum up, the car air bag hairspring will indeed have a fault code, which is a self-protection mechanism of the vehicle safety system, designed to remind the driver and maintenance personnel to carry out maintenance in time.
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