Controller and control method

Abstract

The invention obtains a controller and a control method capable of improving operability of a straddle-type vehicle. In a controllerand a control method according to the invention, an execution section of the controllerexecutes a control mode in which vehicle speed control is enabled in response to a first trigger and the vehicle speed control is disabled in response to a second trigger. In the vehicle speed control, a vehicle speed of a straddle-type vehicleis controlled on the basis of a target vehicle speed in the case where it is determined that the straddle-type vehicletravels on a downhill road. The execution section executes the control mode on the basis of rotational operation information as information on a rotational operation to rotate an accelerator grip, which is located at a reference position in an unloaded state by a rider of the straddle-type vehicleand changes drive power generated to the straddle-type vehiclewhen being rotated within an angle range located in a first direction with the reference position being a reference, within an angle range located in a second direction as a reverse direction from the first direction with the reference position being the reference.