Systems and methods for operating a driveline disconnect clutch of a hybrid vehicle are presented. In one example, a time duration of a boost phase of a driveline disconnect clutch closing sequence is adjusted in response to one or more error values. The error values may include pressure error, integrated pressure error, and electric machine speed error.

A damper device is disposed between an engine and a transmission and has a torque distribution mechanism that is provided with a first input element connected to the engine, a second input element connected to the engine via an elastic member, a first output element connected to the transmission, and a second output element connected to the transmission. The damper device further has a first clutch that is disposed between the first output element and the transmission, and is switched between an engaged state of connecting the first output element to the transmission and a released state of disconnecting the first output element from the transmission, and a second clutch that is disposed between the second output element and the transmission, and is switched between an engaged state of connecting the second output element to the transmission and a released state of disconnecting the second output element from the transmission.

A clutch control system includes a hunting determining unit that determines whether or not a hunting condition, under which hunting occurs in an engine rotational speed of an engine, is met, and a clutch position control unit. The clutch position control unit executes a first clutch position control, which is in accordance with engine rotation information, on the clutch if the hunting determining unit determines that the hunting condition is not met, and executes a second clutch position control, which is lower in response to the engine rotation information than the first clutch position control, on the clutch if the hunting determining unit determines that the hunting condition is met.

A vehicle heating system having a first viscous clutch and a pump and viscous clutch mechanism. The first viscous clutch has a first clutch input member. The pump and viscous clutch mechanism has a pump and a second viscous clutch. The pump includes a pump input member, while the second viscous clutch includes a second clutch input member. One of the pump input member and the second clutch input member is drivingly coupled to a portion of the first viscous clutch.