Towing assist device

A towing assist device comprising:

• a controller configured to assist reversing of a vehicle to which a trailer is coupled with a coupling tool;
• and
• a monitor configured to display a periphery of the coupling tool attached to a rear portion of the vehicle with a rear view at least when the vehicle reverses, wherein
• the controller includes
• an alarm angle calculator configured to calculate an alarm angle equal to or smaller than a jackknife angle causing a jackknife phenomenon by the vehicle and the trailer in reversing,
• an alarm generator configured to give an alarm when a trailer angle between the vehicle and the trailer is equal to or larger than the alarm angle,
• an estimated time calculator configured to calculate an estimated time until the trailer angle equals the jackknife angle by using a trailer angular velocity,
• an emergency steering part configured to send an emergency steering signal to an automatic steering system mounted on the vehicle in order to perform emergency steering of the vehicle in a direction in which the trailer angle decreases when the estimated time calculated by the estimated time calculator is equal to or smaller than a first set time, and
• a brake operation part configured to send a brake operation signal for emergently stopping the vehicle to an automatic brake system mounted on the vehicle when the estimated time calculated by the estimated time calculator is equal to or smaller than a second set time, wherein the first set time is shorter than the second set time.