What is G-Sensor & How does it work in dashcams?


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The G-Sensor is used for detecting and sensing sudden acceleration or deceleration. A common application of the G-Sensor within a vehicle is in the smartphone with the ability to detect and determine vehicle stability and offset during driving, but also can be found in the airbag system, dead reckoning capability and in-dash cams.

Why is the G-sensor test required?

The G-sensor is designed to accurately determine when an occupant has been decelerated sufficiently to activate the airbag. The airbag will not deploy if the G-Sensor cannot accurately read the deceleration value.

To ensure the recording properties of an event data (driving) recorder

The G-sensor of the dash cam is used to detect sudden impacts, and it can record images in all directions at the time of the accident. This prevents data loss due to continuous recording cycles and provides vital evidence for insurance claims.

To ensure Dead Reckoning Capability in the navigation system(Dead Reckoning Capability)

The G-sensor is an electronic device that can detect acceleration and angular velocity. With the use of such a sensor, the dash cam for car can be equipped with a dead reckoning function, which uses the number of magnetic fields generated when passing through different geographic terrains to estimate its position. A slight deviation in this function can easily cause a car accident; not to mention navigation systems without dead reckoning capability, which will display serious location errors.

Dead reckoning is used to provide a location estimation as long as there are no signals from external sources. If a car is driving in a tunnel under circumstances where GPS/GNSS signals are blocked, dead reckoning can be used to estimate the direction of travel and provide an estimate of how far along the path the vehicle has travelled. It can also be used for navigation when there is no GPS coverage

G-value range test & long-time stress test

The G-Sensor is intended to be used in cars and motorcycles, so there are mounting fixtures to safely secure the device in the vehicle. This mechanical-bearing rotary stage simulates instantaneous acceleration and deceleration, ensuring the accuracy and stability of the device’s detection function.

Reliability test

The thermal Chamber ensures the correct functioning of the G-sensor during testing. Tests are performed at ambient temperatures to verify that the vehicle’s G-sensor can adapt to a wide range of climates and weather conditions. The device is also tested in a cold room to verify its performance at low temperatures. This ensures that the G-sensor will continue to operate correctly when the vehicle is exposed to extreme conditions such as high elevations and cold weather.

User scenario test

The vehicle physics test simulates real driving scenarios and road environments, such as passing through high-rise buildings, parking lots and tunnels in different countries and regions to verify the performance of the dead reckoning system in the real world.

G-sensor is a sensitive, high-precision sensor that detects and senses sudden acceleration and deceleration. It plays an important role in various vehicle devices, including airbag systems, dead reckoning capability, emergency call systems etc. Allion’s G-sensor validation test ensures the stability and accuracy of the G-sensor detection function to instantly respond to sudden traffic accidents.


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