What are the parts of an airbag to be inspected?

In the case of occupants using seat belts, airbags help reduce the severity of injuries to the chest, head, and face in the event of a collision. When a car collides in a front, the first thing is to stop the car and the occupants of the car continue to move forward at their original speed under the action of inertial force. Occupants who do not wear seat belts will collide with the steering wheel and front windshield and may suffer serious injuries. Seatbelt occupants can gradually stop moving forward as the car stops moving.

If the collision is severe, the occupants move forward faster, and even if they are wearing seat belts, they will still collide with objects in the vehicle until they stop moving completely. If the airbag installed in the steering wheel or instrument panel is inflated and popped out at this time, it can protect the occupants and reduce the possibility of collision with the objects in the car, more evenly disperse the impact force of the head and chest, absorb the movement energy of the occupants, and thus play a role in supplementing the effect of seat belts. Therefore, the airbag is mainly used to cushion the front collision or approximate the severity of the front collision, and the supplementary seat belt provides protection.

The original intention of designing airbags is to assist in protecting the safety of drivers and passengers under the effect of seat belts, and we are often easy to separate airbags from seat belts, thinking that with airbags, the role of seat belts is not large, in fact, in driving or riding a vehicle equipped with a frontal airbag, the same must be fastened with a seat belt, if a frontal collision occurs, the dual protection role of the seat belt plus the airbag can be fully played. The driver's airbag is placed inside the steering wheel hub and has a complete and smooth decorative cover; The passenger airbag is hidden on the side of the instrument panel, and in the event of a front collision or near-front collision, the airbag installed in the assembly breaks through the outer cover and inflates in a prescribed manner. The Air Bag or the abbreviation SRS Assisted Occupant Protection System or SIR Assisted Inflatable Protection System is engraved on the steering wheel casing and dashboard, indicating that the car is equipped with airbags.

Cars equipped with driver airbags have an indicator light on the dashboard that indicates the status of the airbag system to the driver, and the function of this indicator is explained in the car's owner's manual. Although car factories dictate maintenance or inspection requirements, most airbag systems are always serviceable without the need for routine maintenance.

If there is an uninflated airbag on a car that has been severely damaged by a collision, it is possible that the electrical system of the airbag has malfunctioned so that there is no electrical signal to the inflator, and the power cord should be disconnected first. Considering the energy delay characteristic of the airbag system, do not approach or place items next to the uninflated airbag shortly after a collision. When a car with an airbag catches fire, the airbag assembly automatically inflates when the temperature reaches around 150.

Inflated airbag assemblies are not hazardous and can be disposed of as general waste after dismantling. Replacement of the airbag systemOn a car that can be repaired after a crash, the inflated airbag system must be replaced. Any airbag system is matched to the crash characteristics and cabin size of a particular vehicle type, so only airbag systems designed specifically for that vehicle can be replaced.

Supplemental Restraint System, referred to as SRS, is an auxiliary protection system, and the common steering wheel on cars has a built-in airbag device, which is mainly composed of sensors, microprocessors, inflators and airbags and other main components. Sensors and microprocessors are used to determine the degree of vehicle collision and transmit and send signals; The inflator produces an ignition action according to the signal indication, ignites the solid fuel and generates gas to inflate the airbag, so that the airbag expands rapidly, the airbag is installed in the steering wheel hub close to the buffer pad, its capacity is about 50 90L, the cloth of the airbag has a high tensile strength, the general selection of polyamide material, in order to prevent gas leakage, the inner layer of the airbag is coated with sealing rubber. At the same time, the airbag is equipped with a safety valve, which will automatically release part of the gas when the inflation is excessive or the pressure in the airbag exceeds a certain value, so as to avoid crushing and injuring passengers.

Most of the gases used in airbags are nitrogen or carbon monoxide.

An automotive airbag system consists of a crash sensor, a control module (ECU), an inflator, and an airbag:1. Airbag Sensors:

It is also commonly referred to as a collision sensor. Depending on the application, collision sensors are divided into trigger collision sensors and protective collision sensors. The trigger collision sensor, also known as the collision intensity sensor, is used to detect the acceleration change during the collision and transmit the collision signal to the airbag computer as the trigger signal of the airbag computer; Collision sensors, also known as safety collision sensors, are connected in series with trigger collision sensors to prevent airbags from detonation.

2.Control Modules (ECUs): Collision protection sensors are typically assembled with airbag system ECUs, mostly mounted under the cockpit center console.

The ECU is the core component of the airbag system. 3.Gas Generator:

It is mainly used to generate a large amount of gas in a short period of time (about 30ms) and fill airbags. The gas produced must be harmless to the human body and the temperature must not be too high. At the same time, the gas generator is required to have high reliability and stability.

At present, gas generators mainly include compressed gas type, pyrotechnic type and mixed type. 4.Airbags:

It is generally made of polyethylene terephthalate fabric, which has good crack resistance. It is a semi-rigid polymer beam material that can withstand a lot of pressure. After vulcanization, the impact of airbag inflation is reduced.

The airbag (SRS) system consists of a collision sensor, an airbag assembly (airbag and inflator), and an SRS electronic control unit. Collision sensors include front (left and right) collision sensors, **collision sensors, and safety sensors. Gas generators include detonators, boosters, filters, and solid fuel, among others.

In addition to this, the SRS system is equipped with a backup power supply and a fault self-diagnosis device.

1.General inspection methods for SRS systems.

When the ignition is turned on, the airbag fault indicator light (SRS light) on the dashboard is on and turns off after about 5-10s, which means that the system is working normally. Depending on the model, the time when the SRS light is on is slightly different.

If the SRS light stays on, it indicates that the SRS system is faulty and the SRS system should be checked.

The general inspection method is:

1) When the ignition switch is turned on, the SRS lamp should be lit normally, so when the light is not on, check whether the SRS lamp bulb is burned out and whether the circuit is broken.

2) Remove the airbag wire connector first, and short the terminals of the airbag side wire connector.

3) Check whether the collision sensor circuit is open or short-circuited with a multimeter.

4) Check the DC impedance of the collision sensor with a multimeter should meet the technical requirements of the model, otherwise the collision sensor should be replaced.

5) Check the installation of the collision sensor, if it is found to be loose, it should be tightened.

6) Check the connection status of the wiring harness and connector of the SRS system, and if any abnormality is found, it should be repaired or replaced.

7) Clear the fault, and then repeat the ignition switch "on/off" operation, check the fault, if the output is normal, then further electrical inspection, if the output is faulty, then determine the additional operation items according to the fault.

How do you check an airbag? Do you know this? Let's listen to what the guy has to say.

Some cars have an accident only to find out that the airbag is not open, or it is not installed. The consequences are severe. When we are usually driving, we should always check whether the airbag is working properly.

So, how do we check the airbags? In fact, it is very simple, you can use a screwdriver to pry open the front cover of the steering wheel, and you can directly see whether the airbag is still there, it is a square box. If it's gone, then the airbag must be gone.

If so, you can check whether it is normal by the self-test light at the time of activation on the instrument panel. Generally, an airbag light is a lamp with a ball in front of the seat. If this light is solid while driving, the airbag system is faulty.

Or you can look at the airbag light, check the hairspring in the steering wheel, and use the special diagnostic instrument diagnostic instrument to enter the vehicle airbag computer module for detection.