US Patent 11180081 Rear-side alarm device and rear-side alarm method thereof

A rear-side alarm device and a rear-side alarm method thereof. The rear-side alarm device includes a sensor and a controller. The sensor monitors a rear area or a rear-side area of a vehicle. If a trailer connected to the vehicle is detected, the controller sets a system deactivation area and a system activation area, based on status information of the trailer, and controls an alarm operation to be performed by judging whether or not another vehicle has entered into the system activation area. The rear-side alarm device can operate normally even in the case in which a trailer is connected to a vehicle, thereby providing driving safety to a driver.