What is the main airbag of a car
The main airbag of a car is an inflatable soft sac installed directly in front of the driver, usually located in the center of the steering wheel. When a vehicle collision occurs, it can instantly inflate and pop out, buffering the direct impact of the driver's upper body on the steering wheel and reducing injuries to the head and chest.
Working principle
The main airbag fills the airbag by generating a large amount of gas in an extremely short time through gas generators such as sodium azide or ammonium nitrate. When the degree of vehicle impact reaches the preset threshold, the sensor triggers the gas generator, and the entire process takes approximately 0.03 seconds to complete.
Protective effect
Youdaoplaceholder0 Disperse impact force : Absorb the kinetic energy of the driver 's upper body and avoid being hit by hard objects;
Youdaoplaceholder0 Extend braking distance : when used in conjunction with seat belts, it reduces the impact force by absorbing energy;
Youdaoplaceholder0 Reduce secondary injuries : prevent the driver from rushing out of the vehicle due to inertia and at the same time prevent head and neck injuries.
Please note that the main airbag must be used in conjunction with the seat belt to achieve the best protective effect.
The main airbag of a car mainly expands rapidly in the event of a collision, working in conjunction with the seat belt to provide cushioning protection for the driver and passengers, reducing the impact injuries to key areas such as the chest and brain.
Core protection mechanism
When a collision occurs, the sensor detects the impact force, and the control unit triggers the inflation device to release gases such as nitrogen, causing the airbag to expand within 25 to 35 milliseconds and form an air cushion buffer layer, reducing the direct contact impact force between the occupants and hard objects inside the vehicle.
Scope of protection
The main airbag usually covers the driver's seat and the front passenger seat, with the main protected areas being the chest, brain and face. Studies show that when used in combination with seat belts, the rate of head injuries can be reduced by 25%, and the rate of facial injuries can be lowered by approximately 80%.
Limitations
Although it can significantly reduce the risk of injury, it needs to be used in conjunction with a seat belt. If the seat belt is not fastened, the airbag may cause secondary injuries due to inertia.
The damage to the main airbag of a car needs to be repaired based on the specific cause of the fault. Common causes include poor contact in the circuit, sensor failure or abnormal control unit, etc. The following is the specific analysis and solution:
Poor contact of the line
The airbag wiring harness plug under the seat may become loose, fall off or have poor contact due to frequent seat adjustments or vibrations. The solution is to reinsert the plug tightly. If the problem keeps recurring, check the wiring fixation.
Sensor failure
Damage to the driver's side airbag sensor can cause the system to misjudge the intensity of the collision and trigger the fault light alarm. Original or compatible sensors need to be replaced to avoid safety hazards caused by using non-certified accessories.
Abnormal control unit
Internal faults in the airbag control module (ECU) may record incorrect fault codes or fail to initialize the system normally. Fault codes should be cleared through professional diagnostic instruments, and the control unit should be replaced if necessary.
Battery voltage issue
Low battery power or unstable voltage can cause the system to falsely report fault codes. After charging or replacing the battery, the fault light may go out automatically.
The hairspring (steering wheel wiring harness) is damaged
Wear of the hairspring (clock spring) under the steering wheel can cause poor contact in the circuit. It is necessary to check the resistance value (normal range: 2-4Ω) and replace the damaged part.
Youdaoplaceholder0 tip : In case of safety system failure, it is recommended to handle it at a 4S store or a professional maintenance institution. Do not disassemble the steering wheel or install non-original parts by yourself, as this may cause safety hazards.
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