How do airbags work?

The car only uses seat belts at low speed to protect the safety of the driver and passengers If the car crashes when it is fast driving, it is necessary to use the airbag So what is the working principle of the airbag.

During the driving of the car, the sensor system continuously sends speed change (or acceleration) information to the control device, and the control unit analyzes and judges this information, if the measured acceleration, speed change or other indicators exceed the predetermined value, the control device sends an ignition command to the gas generator or the sensor directly controls the ignition, and the first reaction occurs after ignition, and nitrogen is filled with air bags to form a protective air bag.

An electronic control of safety airbag airbag system is a passive safety (see Automotive Safety Performance) protection system that works in conjunction with seat belts to provide effective crash protection for occupants. In the event of a car collision, car airbags can reduce the rate of head injuries by 25% and the rate of facial injuries by about 8 0%.

It is mainly composed of airbag sensors, anti-collision airbags and electronic control devices. The driver's side crash avoidance airbag is installed in the steering wheel; Occupant-side crash avoidance airbag devices are typically mounted on the instrument panel. The airbag sensor is installed on the left, right and middle of the cab partition; The airbag sensor and airbag system in the middle are mounted with electronic controls.

Airbag components are mainly composed of airbags, inflators, and igniters. For example, the electronic control device is used for data acquisition and data processing, diagnosing the reliability of the airbag, ensuring that when the preset value is reached, the ignition signal is sent out in time, and the ignition is timed to ensure that the driving gas generator has a large enough driving current.

Principle. When a collision occurs while the car is driving, the airbag sensor first receives the impact signal, and as long as the specified strength is reached, the sensor will produce action and send a signal to the electronic controller. After receiving the signal, the electronic controller compares it with its original stored signal, and if the airbag condition is reached, the driving circuit sends a starting signal to the inflator in the airbag assembly.

After receiving the signal, the gas generator is ignited, and a large amount of gas is generated, which enters the airbag after being filtered and cooled, so that the airbag breaks through the liner quickly in a very short time, forms an elastic air cushion in the front of the driver or occupant, and leaks and contracts in time to absorb the impact energy, so as to effectively protect the human head and chest, so that it can avoid injury or reduce the degree of injury.

Hyundai cars have not only added side impact avoidance airbags, but also continued to develop and improve the fabric materials of airbags, igniters, sensor technology, etc.