In a vehicle that includes an engine including a starter, an automatic transmission unit having an input shaft coupled to an output shaft of the engine via a first clutch, and a motor generator (hereinafter, referred to as MG) coupled to the input shaft of the automatic transmission unit via a second clutch, an electronic control unit starts up the engine with the use of the starter in a state where the MG is disconnected from the engine by releasing at least one of the first clutch or the second clutch when an IG-on operation has been made in an IG-off state (a state where the vehicle is stopped in a P range) and a power control unit that supplies electric power to the MG has a failure.

A power transmission device includes: an axle housing having a central hole where a drive shaft is penetrated; a wheel hub disposed in an outer portion of the axle housing via wheel bearings; a speed-reducer housing chamber provided in the wheel hub to cover an opening end portion of the axle housing; a gear speed reducer, formed inside the speed-reducer housing chamber, to decelerate a rotation of the drive shaft and transmit the rotation to the wheel hub; and a wet-type brake mechanism housed in a brake chamber formed between the axle housing and the wheel hub, and actuated such that braking is applied to a rotation of the wheel hub relative to the axle housing. Further, floating seals are disposed between a lubrication space and the speed-reducer housing chamber, and a circulation passage for oil that includes an oil filter is connected to the lubrication space.

A method for learning a touch point of an engine clutch of a hybrid electric vehicle including a motor connected to a transmission and an engine selectively connected to the motor through the engine clutch includes determining whether a learning condition of the touch point of the engine clutch is satisfied, releasing a transmission clutch and controlling a motor speed when the learning condition is satisfied, increasing a coupling pressure of the engine clutch when a change amount of the motor speed is less than a first predetermined value, comparing a change amount of a motor torque according to the increased coupling pressure of the engine clutch with a second predetermined value, and learning the touch point of the engine clutch when the change amount of the motor torque is greater than or equal to the second predetermined value.

In a vehicle including an engine and a motor generator that are connected to a drive wheel, when a predetermined condition is satisfied during a motor creep mode in which creep torque is generated by the motor generator, an ECU performs motor creep cutoff for decreasing torque of the motor generator. When an engine start request has been issued during the motor creep cutoff, the ECU increases the torque of the motor generator to a target creep torque at a predetermined rate of increase. After the MG torque has reached the target creep torque, the ECU starts the engine. The predetermined rate of increase is set to a rate lower than a rate of increase in engine torque at the start of the engine.

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 for a hybrid vehicle to start an engine without causing a torque drop is provided. A combined planetary gear unit is configured in such a manner that an input element connected to the engine and an output element are situated between a reaction element connected to a first motor and a fixed element connected to a brake in a nomographic diagram. The first motor is selectively connected to the engine by a clutch. A controller is configured to start the engine by the first motor while engaging the brake to restrict rotation of the fixed element and engaging the clutch.

A hybrid vehicle clutch control device includes an engine, a motor generator, a first clutch, a second clutch and at least one controller. The first clutch interrupts a torque transmission between the engine and the motor generator. The second clutch interrupts the torque transmission between the motor generator and driving wheels. The controller starts the engine using torque from the motor generator, when switching from an electric vehicle mode to a hybrid mode. When starting the engine accompanying an accelerator depression, the allocation of the transmission torque capacity of the second clutch is increased when the accelerator position opening amount is equal to or less than a predetermined accelerator position opening amount, as compared to when exceeding the predetermined accelerator position opening amount.

A road vehicle with an electric drive having: a heat engine provided with a carrier shaft; a gearbox; at least one pump actuated by a carrier shaft; at least a reversible electric machine; a first mechanical transmission, which transmits the motion from the drive shaft of the heat engine to the carrier shaft and is provided with a first freewheel; a second mechanical transmission, which transmits the motion from the shaft of the electric machine to the carrier shaft and is provided with a second freewheel; and a third mechanical transmission, which is arranged in parallel to the second mechanical transmission, transmits the motion from the shaft of the electric machine to the carrier shaft, is provided with a third freewheel and reverses the direction of motion with respect to the second mechanical transmission.

A drive system for a hybrid vehicle, the drive system includes an engine (1), a rotary machine (MG1), a differential unit (20), and a transmission unit (10). The rotary machine (MG1) is arranged coaxially with the engine (1). The differential unit (20) connects the engine (1) and the rotary machine (MG1) to a drive wheel side. The differential unit (20) is arranged coaxially with the engine (1) and the rotary machine (MG1). The differential unit (20) is arranged between the engine (1) and the rotary machine (MG2). The transmission unit (10) changes rotation of the engine in speed and transmits the rotation to the differential unit (20). The transmission unit (10) is arranged coaxially with the engine (1), the rotary machine (MG1) and the differential unit (20). The rotary machine (MG1) and the differential unit (20) are arranged between the transmission unit (10) and the engine (1).

The invention relates to a method for determining an engagement point of a hybrid clutch in a hybrid vehicle; which hybrid clutch is actuated by a hydrostatic clutch actuator and disconnects or connects an internal combustion engine and an electric traction drive; the engagement point is determined by slowly actuating the clutch starting from a position in which the hybrid clutch is in the non-actuated state, and monitoring a moment of the electric traction drive when a defined increase in the momentum is detected. In a method in which engagement point adaptation is optimized, a current engagement point (tp) is adapted during operation of the hybrid vehicle using a start-up routine, by which a first engagement point is determined when the hybrid vehicle is started; the hybrid clutch is moved close to a previously determined engagement point, and starting from said last determined engagement point, the hybrid clutch is displaced further until the defined increase in the moment is detected.