Rider-assistance system and control method for rider-assistance system

A control method for a rider-assistance system (1) that assists with driving by a rider of a straddle-type vehicle (100),

• the rider-assistance system (1) including:
• a peripheral environment detector (10) that is mounted to the straddle-type vehicle (100) and detects peripheral environment of said straddle-type vehicle (100);
• an input device (20) that is mounted to the straddle-type vehicle (100) and is operated by the rider of said straddle-type vehicle (100);
• and a controller (50) that governs operation of the rider-assistance system (1),
• the control method comprising:
• an acquisition step (S101, S201) in which an acquisition section (51A, 51B) of the controller (50) acquires pitch angle correction target information that is target information on pitch angle correction of the peripheral environment detector (10);
• and
• a correction operation performing step (S103, S104, S203, S204) in which a correction operation performing section (53) of the controller (50) performs correction operation for detection of the peripheral environment by the peripheral environment detector (10) on the basis of the pitch angle correction target information acquired in the acquisition step (S101, S201).