AHS(Active Hood lift System) is a system which lifts the hood in order to reduce the head injury of the pedestrian when there is a crash between pedestrian and vehicle.

It reduces the head injury of pedestrian due to actuator’s buffer and 2nd impact prevention between the head and engine room parts.

AHS CM monitors the vehicle speed, the ambient air temperature, whether the contact sensor operates while driving constantly. If crash occurs, the contact sensor senses the crash first and pedestrian determination logic starts to operate.

It conducts the optical fiber sensor signal analysis from the pedestrian determination logic and this basically goes through the crashing strength compensation due to vehicle speed, the crashing location apprehended by the contact sensor, and "AMBIENT TEMPERATURE SENSOR" of the bumper.

Lastly, if the system determines as a pedestrian, it immediately drives the actuators to operate the hood. The actuator is driven when a pedestrian or objects(perceived as a pedestrian) is crashed on the bumper.

If the actuator operating power(9~16V, 28A~35A) is supplied from "Actuator On" terminal of AHS CM to the actuators, they are deployed within 0.5 seconds. And then hood's cowl is lifted up.

The actuator is the spring type that is reusable up to three times.