How to correct the detection warning HMW and the front car collision warning FCW

"Vehicle distance detection and early warning technology is also to detect the headway between the vehicle and the vehicle in front, and send an alarm to the driver when the vehicle distance is too close. Because the distance between vehicles and headway is generally displayed in time, it is easy to be confused with the collision time of FCW, but the calculation methods of HMW distance time and FCW collision time (TTC) are different: Headway time = distance between two vehicles / vehicle speed of the vehicle Collision time of FCW (TTC) = distance between two vehicles / relative speed of two vehicles For example, if the distance between the rear two vehicles is 20m, the speed of the front vehicle is 60km / h, and the speed of the rear vehicle is 80km / h, the time displayed by HMW is 1.2 seconds, while the TTC collision time displayed by FCW is 3.6 seconds. If the speed of the front and rear vehicles is 60km / h, the time displayed by HMW is also 1.2 seconds, and FCW will not alarm, because although the two vehicles are close, they have the same speed and will not rear end collision. Therefore, when the front and rear vehicles are in motion, the TTC collision time of FCW is generally longer than the headway distance time. In the actual scene, HMW mainly alarms when the distance between vehicles is close, which can help drivers develop the standard driving habit of maintaining the distance between vehicles. We define it as a "dangerous but not urgent" function; FCW is mainly aimed at the emergency situation where the front and rear vehicles are close and there is a large speed difference, such as the emergency brake of the front vehicle, which belongs to the "dangerous and emergency" function., Read the full text“

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