A control system for a hybrid vehicle configured to prevent a reduction in the purifying performance of the catalyst in a predetermined operating mode. An operating mode of the hybrid vehicle can be selected from a first hybrid vehicle mode, a second hybrid vehicle mode, and a fixed mode. A controller that is configured to restrict a shifting operation between the first hybrid vehicle mode and the second hybrid vehicle mode via the fixed mode, when the purifying device is being warmed or the purifying device has to be warmed.

A power transmission unit that can prevent unintentional disengagement of a clutch. A first set of teeth formed on an outer circumferential surface of a first rotary member is engaged with a third set of teeth formed on an inner circumferential surface of a second rotary member. A second set of teeth formed on an inner circumferential surface of the first rotary member is meshed with a fourth set of teeth formed on an outer circumferential surface of a third rotary member. A center of engagement between the first set of teeth and the third set of teeth is situated at a point withdrawn from a center of engagement between the second set of teeth and the fourth set of teeth in the direction to disengage the first set of teeth from the third set of teeth.

A powertrain for a hybrid vehicle may include a complex planetary gear set including four rotation elements having first, second, third, and fourth rotation elements; a motor-generator fixedly connected to the first rotation element of the complex planetary gear set; a first brake configured to selectively connect the second rotation element of the complex planetary gear set to a transmission housing; an input shaft connected to an engine and configured to be selectively connectable to each of the first rotation element and the third rotation element of the complex planetary gear set; and an output shaft connected to the fourth rotation element of the complex planetary gear set.

The power-transmission device has an input shaft, an output shaft, a gear mechanism, and a motor. The gear mechanism includes a plurality of planetary gear mechanisms and a mode-switching mechanism, and transmits the rotations of the input shaft to the output shaft. The mode-switching mechanism selectively switches the drive-power transmission path of the power-transmission device between a plurality of modes. The motor is connected to the rotating elements of the planetary gear mechanisms. A target-input-torque determination unit determines the target input torque, which is a target value for the torque to be inputted to the power-transmission device. The target-output-torque determination unit determines the target output torque, which is a target value for the torque to be outputted from the power-transmission device. The command-torque determination unit uses the torque balance information to determine torque commands to the motor from the target input torque and the target output torque.

Drive device for a motor vehicle, includes a differential for distributing a torque that can be supplied via a drive shaft to two output shafts and a superimposition gear coupled with the differential one of the output shafts and an additional motor for superimposing torques supplied from the output shaft, from the differential and from the additional motor, wherein the differential is coupled via a torque reducing transmission ratio device with the superimposition gear, wherein the superimposition gear includes a switching device that can be controlled with a control device, wherein the superimposition gear superimposes in a first switching mode torques supplied to the switching device from the output shaft.

A tolerance ring is interposed between an output side rotary shaft and a rotor shaft. For this reason, even in a case where a backlash formed in a spline fitting portion between the output side rotary shaft and the rotor shaft is not eliminated, the rotary shafts of both of the output side rotary shaft and the rotor shaft are held by the tolerance ring without a backlash, and rattling noise can be suppressed. An oil supply groove for supplying a lubricant between an annular portion of the tolerance ring and the output side rotary shaft is provided inside an annular groove formed in the output side rotary shaft. With this, it is possible to suppress degradation of the durability of the tolerance ring without performing special processing on the tolerance ring.

A hybrid vehicle driving apparatus includes: an engine; a first rotating machine; a second rotating machine; planetary gear mechanisms capable of forming a four-element complex planetary to which the engine, the first rotating machine, the second rotating machine, and drive wheels are connected; and a controller. In a collinear diagram of the complex planetary, the first and second rotating machines are adjacent to each other and disposed on one side with respect to the engine. In a state in which the complex planetary is formed, the controller is configured to operate, in a predetermined mode, the first and second rotating machines at operating points at which a total of absolute values of workloads of the first and second rotating machines is smaller than the total of the absolute values at operating points for achieving an electric power balance between the first and second rotating machines.

An electro-hydraulic hybrid-power driving system, comprising an engine, a first motor, a second motor, a first planetary gear set, a second planetary gear set, and a hydraulic control shift set that is connected to the engine. The first motor is axially connected to the engine, the second motor is axially connected to the first planetary gear set and the second planetary gear set, and the first planetary gear set is coaxially connected to the second planetary gear set. The hydraulic control shift set includes a first gear and a second gear, a dual wet clutch is disposed between the first gear and the second gear, and the first gear, the second gear, and the dual wet clutch are coaxially connected to the engine. The present invention by disposing a specific electro-hydraulic hybrid-power driving system, different working modes can be implemented according to different requirements.

A vehicle control system configured to limit damage to an electric storage device even if a speed of a motor is changed abruptly. The control system includes a differential mechanism connected to an engine, a motor, and drive wheels, and a clutch. The control system includes a controller is configured to calculate an upper limit power possible to be applied or discharged to or from an electric storage device when a condition to engage the clutch is satisfied and restrict the electric power to be applied or discharged to or from the electric storage device when the electric power is equal to or less than a maximum allowable power that is less than the upper limit power before the clutch is engaged.

A control method and system for a hybrid vehicle including an engine, a first motor/generator and a second motor/generator a power sources are provided. The control method includes performing a parallel driving mode by driving with a driving power transmitted from the engine and the second motor/generator at a fixed gear ratio. Additionally, an OD brake is released from fixing a gear ratio of a planetary gear set disposed between the generator and the engine. Then an EV driving mode is performed with a driving power of the second motor/generator.