Abstract: A dog clutch control system includes a dog clutch including a first engagement member and a second engagement member, an actuator, a rotational speed detecting unit, an arrival timing predicting unit, and a phase correcting unit. The arrival timing predicting unit predicts an arrival timing at which a rotational speed difference between the first engagement member and the second engagement member is adjusted to a value equal to or less than a predetermined threshold, based on the rotational speeds of the first and second engagement member and a time variation characteristic of the rotational speed difference during a rotational speed adjustment. The phase correcting unit performs a phase correction to bring an engageable timing, which is a timing at which the first engagement member is engageable with the second engagement member after the arrival timing, closer to the arrival timing compared to a case without the phase correction.

Abstract: A dog clutch control system includes a dog clutch including a first engagement member and a second engagement member, an actuator, a rotational speed detecting unit, an arrival timing predicting unit, and a phase correcting unit. The arrival timing predicting unit predicts an arrival timing at which a rotational speed difference between the first engagement member and the second engagement member is adjusted to a value equal to or less than a predetermined threshold, based on the rotational speeds of the first and second engagement member and a time variation characteristic of the rotational speed difference during a rotational speed adjustment. The phase correcting unit performs a phase correction to bring an engageable timing, which is a timing at which the first engagement member is engageable with the second engagement member after the arrival timing, closer to the arrival timing compared to a case without the phase correction.

Abstract: A phase adjusting mechanism is engaged with a brake shaft, and adjusts a rotation phase between a crankshaft and a camshaft according to a braking torque acting on a rotor. The rotation phase is adjusted in a predetermined direction when the braking torque is increased. A torque input mechanism inputs a return torque into the phase adjusting mechanism to return the rotation phase in an opposite direction opposite from the predetermined direction. The torque input mechanism increases the return torque corresponding to the rotation phase as an environmental temperature of the variable valve timing apparatus is lowered.