In a marine hybrid system which includes an engine, an electric motor, a thrust generation device, and a clutch mechanism configured to be able to switch connection states therebetween, if it is determined that the engine is in an overload condition, the clutch mechanism is controlled such that a load of the engine is reduced.

In a marine hybrid system which includes an engine, an electric motor, a thrust generation device, and a clutch mechanism configured to be able to switch connection states therebetween, if it is determined that the engine is in an overload condition, the clutch mechanism is controlled such that a load of the engine is reduced.

A method for shifting multi-speed transmissions of marine propulsion devices each having a power head and a shift schedule for shifting between first and second gears to transmit torque from the powerhead. The method includes configuring the transmissions of leader and follower marine propulsion devices to shift when shift schedules of the leader and of the follower indicate shift recommendations, respectively. The method further includes receiving a request to shift the transmission of the leader when the shift schedule of the leader indicates the shift recommendation. The method further includes determining whether conditions are met for the follower to follow the leader in shifting. The method further includes automatically requesting, when conditions are determined to be met for the follower to follow the leader, to shift the transmission of the follower so as to be coordinated with shifting the transmission of the leader.

A method for shifting a multi-speed transmission of a marine propulsion device from a first gear being engaged to a second gear being engaged by selectively filling a first clutch and a second clutch with a fluid. The method includes operating the marine propulsion device with the second gear disengaged and controlling the second clutch to perform a first prefill in which fluid is injected into the second clutch to partially fill the second clutch while the second gear remains disengaged. The method further includes receiving, after the first prefill, a request to shift from the first gear to the second gear and subsequently increasing a pressure in the second clutch to cause the second gear to engage and decreasing a pressure in the first clutch to cause the first gear to disengage to thereby shift the multi-speed transmission.