Abstract: A four-wheeled vehicle includes: a frame; two front suspension assemblies and two rear suspension assemblies connected to the frame; two front wheels operatively connected to corresponding ones of the two front suspension assemblies; two rear wheels operatively connected to corresponding ones of the two rear suspension assemblies; a motor connected to the frame; a front differential and a rear differential operatively connecting the motor to the two front wheels and the two rear wheels respectively; and a steering system. The steering system includes a front steering assembly for steering the front wheels and a rear steering assembly for steering the rear wheels. The front steering assembly includes a user-operated steering input device. The rear steering assembly includes an actuator operatively connected to the rear wheels and operable to modify a steering angle thereof. The actuator is mounted to the frame and is disposed completely rearward of the rear differential.

Abstract: A method for steering a four-wheeled vehicle includes: determining a front wheel steering angle; determining a responsive low-speed steering angle of the two rear wheels, the responsive low-speed steering angle being (i) negative when the front wheel steering angle is positive, and (ii) positive when the front wheel steering angle is negative; determining a responsive high-speed steering angle of the two rear wheels, the responsive high-speed steering angle being (i) non-negative when the front wheel steering angle is positive, and (ii) non-positive when the front wheel steering angle is negative; determining a responsive rear wheel steering angle being a sum of the responsive low-speed and high-speed steering angles; and controlling a steering actuator to steer the two rear wheels in accordance with the responsive rear wheel steering angle.

Abstract: A method for steering a four-wheeled vehicle includes: determining a front wheel steering angle; determining a responsive low-speed steering angle of the two rear wheels, the responsive low-speed steering angle being (i) negative when the front wheel steering angle is positive, and (ii) positive when the front wheel steering angle is negative; determining a responsive high-speed steering angle of the two rear wheels, the responsive high-speed steering angle being (i) non-negative when the front wheel steering angle is positive, and (ii) non-positive when the front wheel steering angle is negative; determining a responsive rear wheel steering angle being a sum of the responsive low-speed and high-speed steering angles; and controlling a steering actuator to steer the two rear wheels in accordance with the responsive rear wheel steering angle.

Abstract: A four-wheeled vehicle includes: a frame; two front suspension assemblies and two rear suspension assemblies connected to the frame; two front wheels operatively connected to corresponding ones of the two front suspension assemblies; two rear wheels operatively connected to corresponding ones of the two rear suspension assemblies; a motor connected to the frame; a front differential and a rear differential operatively connecting the motor to the two front wheels and the two rear wheels respectively; and a steering system. The steering system includes a front steering assembly for steering the front wheels and a rear steering assembly for steering the rear wheels. The front steering assembly includes a user-operated steering input device. The rear steering assembly includes an actuator operatively connected to the rear wheels and operable to modify a steering angle thereof. The actuator is mounted to the frame and is disposed completely rearward of the rear differential.

Abstract: A method of limiting belt slip in a continuously variable transmission (CVT) of a vehicle. The CVT is operatively connected to an engine. The method includes determining a slip speed of a belt of the CVT, determining the accumulated energy based on the slip speed of the belt and an engine torque produced by the engine, and controlling the engine torque in an intervention mode when the accumulated energy is greater than a threshold energy. Controlling the engine torque in the intervention mode comprises controlling at least one of cycling the engine torque, and limiting the engine torque. Systems and vehicles for performing the method are also disclosed.

Abstract: A method of limiting belt slip in a continuously variable transmission (CVT) of a vehicle. The CVT is operatively connected to an engine. The method includes determining a slip speed of a belt of the CVT, determining the accumulated energy based on the slip speed of the belt and an engine torque produced by the engine, and controlling the engine torque in an intervention mode when the accumulated energy is greater than a threshold energy. Controlling the engine torque in the intervention mode comprises controlling at least one of cycling the engine torque, and limiting the engine torque. Systems and vehicles for performing the method are also disclosed.

Abstract: A watercraft propulsion system has a driveshaft, one of an impeller and a propeller, an overrunning clutch having outer and inner races, a driveshaft connector connecting the driveshaft to the outer race, an electric motor having a motor output shaft operatively connected to the outer race, and an internal combustion engine. The engine has a crankcase and a crankshaft operatively connected to the inner race. A lubricant pump supplies lubricant to the overrunning clutch via lubricant passages in the crankshaft. A watercraft having the propulsion system and a hybrid propulsion conversion system for a watercraft are also disclosed.

Abstract: A vehicle has an engine having a crankshaft, a hydraulically controlled multi-plate clutch operatively connected to the crankshaft, and an output shaft operatively connected to the clutch. The clutch selectively transmits power from the crankshaft to the output shaft. A propulsion element is operatively connected to the output shaft. A hydraulic fluid supply system is fluidly connected to the clutch for supplying pressurized hydraulic fluid to the clutch. A controller is connected to the hydraulic fluid supply system. The controller receives a torque signal indicative of engine torque and controls the hydraulic fluid supply system based at least in part on the torque signal. A clutch control method and system are also disclosed.