A vehicle includes a differential gear that transmits rotation of a propeller shaft to an axle. A differential lock switches the differential gear between a locked state and an unlocked state. A clutch is provided in a power transmission path between a prime mover and wheels of the vehicle. A controller controls an engaging force of the clutch during a moving start of the vehicle in accordance with which of the locked state and the unlocked state is selected by the differential gear.

A method and an apparatus for controlling a hybrid electric vehicle including a dual clutch transmission are provided. The method for controlling a hybrid electric vehicle including a dual clutch transmission may include: determining whether an engine start condition is satisfied in a state in which an engine is stopped; determining whether a kick-down shift condition is satisfied when the engine start condition is satisfied; connecting a speed gear corresponding to a target gear stage to an output shaft corresponding to the target gear stage when the kick-down shift condition is satisfied; determining whether a lock-up condition of an engine clutch is satisfied when the engine start condition is satisfied; locking up the engine clutch when the lock-up condition of the engine clutch is satisfied; and locking up a shift clutch corresponding to the target gear stage when the engine clutch is locked up.

A method for controlling a powertrain includes, in response to an output torque request that includes deceleration, operating an internal combustion engine in a fuel cutoff state and in a cylinder deactivation state, controlling a clutch of a torque converter in an activated state, and operating an electric machine in a regenerative braking state. A state of the powertrain related to engine speed is monitored. The internal combustion engine is commanded to transition from the cylinder deactivation state to an all-cylinder state and the electric machine operates in the regenerative braking state including ramping down magnitude of regenerative braking torque when the engine speed is less than a first threshold speed. The torque converter clutch is commanded to a released state when the engine speed is less than a second threshold speed, with the first threshold speed being greater than the second threshold speed.

An ECU executes control processing including the step of extracting amplitudes f1, f2 of a resonant zone when a traveling mode is in a hybrid traveling mode, the step of executing count processing, the step of starting a first resonance avoidance control when a first count value Nf1 is greater than a threshold value n(1), the step of starting a second resonance avoidance control when a second count value Nf2 is greater than a threshold value n(2), the step of releasing a clutch K2 when resonance continues even after elapse of a predetermined time period Tb from starting of the second resonance avoidance control, and the step of terminating the resonance avoidance control when predetermined time period Ta has elapsed from determination of occurrence of resonance.

A method for controlling a powertrain includes, in response to an output torque request that includes deceleration, operating an internal combustion engine in a fuel cutoff state and in a cylinder deactivation state, controlling a clutch of a torque converter in an activated state, and operating an electric machine in a regenerative braking state. A state of the powertrain related to engine speed is monitored. The internal combustion engine is commanded to transition from the cylinder deactivation state to an all-cylinder state and the electric machine operates in the regenerative braking state including ramping down magnitude of regenerative braking torque when the engine speed is less than a first threshold speed. The torque converter clutch is commanded to a released state when the engine speed is less than a second threshold speed, with the first threshold speed being greater than the second threshold speed.

An apparatus for controlling an engine clutch of a hybrid vehicle includes an engine for providing driving power of the vehicle through combustion of a fuel, a motor for providing driving power of the vehicle by electric energy, a battery connected to the motor, and providing electric energy to the motor, an engine clutch for selectively connecting the engine and a driving shaft, and a control unit for measuring a real-time engine torque, revising a predetermined release delay time of the engine clutch according to a change rate of the real-time engine torque, and maintaining a lock-up of the engine clutch for the revised release delay time of the engine clutch when a hybrid travelling mode is switched to an electric travelling mode.

A control system controls a power transmission system located between a motive power source and drive wheels. The power transmission system includes a fluid coupling and an engagement device. The control system includes an electronic control unit configured to: obtain information concerning vibration of the power transmission system; determine whether the vibration of the power transmission system is in a resonance region of the power transmission system; control the engagement device so that the engagement device slips, when the electronic control unit determines that the power transmission system is in the resonance region; and control the motive power source when the electronic control unit determines that the power transmission system is in the resonance region, so that a rotational speed of the motive power source increases as compared with a case where the power transmission system is not in the resonance region.