Methods and systems are provided for an electric axle assembly. In one example, a system includes an electric axle assembly configured to receive an output of a ring gear, wherein a differential of the electric axle assembly distributes the output to wheels of a vehicle.

A planetary gear train transmission device of a hybrid vehicle is provided, which belongs to the technical field of transmissions. A transmission device of a hybrid vehicle based on a planetary gear train, which has a simple structure and is convenient to maintain is provided. The transmission device is composed of two motors, two clutches, one simple planetary gear train, and one complex planetary gear train. One motor is mainly used for generating power, and the other motor is used for driving the vehicle to move forward and brake to recover energy. Selection of different speed ratios and different working modes can be achieved by means of different combinations of the clutches and the planetary gear trains and different working states of the engine and the two motors. The present disclosure is convenient to control, has a compact structure, and adopts a few of parts.

A planetary gear train transmission device of a hybrid vehicle is provided, which belongs to the technical field of transmissions. A transmission device of a hybrid vehicle based on a planetary gear train, which has a simple structure and is convenient to maintain is provided. The transmission device is composed of two motors, two clutches, one simple planetary gear train, and one complex planetary gear train. One motor is mainly used for generating power, and the other motor is used for driving the vehicle to move forward and brake to recover energy. Selection of different speed ratios and different working modes can be achieved by means of different combinations of the clutches and the planetary gear trains and different working states of the engine and the two motors. The present disclosure is convenient to control, has a compact structure, and adopts a few of parts.

A power transmission apparatus has a power distribution mechanism which is connected to an engine and a first motor-generator an in which at least three rotation elements enable to rotate in differential motions to one another, a power combining mechanism which is connected to the power distribution mechanism, a second motor-generator and an output shaft and in which four rotation elements enable to rotate in differential motions to one another, a brake mechanism which enables to selectively fix a rotation element of the power combining mechanism and a brake mechanism which enables to selectively fix a rotation element of the power combining mechanism which is connected to the engine.

Methods and systems are provided for an electric axle assembly. In one example, a system includes an electric axle assembly configured to receive an output of a ring gear, wherein a differential of the electric axle assembly distributes the output to wheels of a vehicle.

A power transmission apparatus has a power distribution mechanism which is connected to an engine and a first motor-generator an in which at least three rotation elements enable to rotate in differential motions to one another, a power combining mechanism which is connected to the power distribution mechanism, a second motor-generator and an output shaft and in which four rotation elements enable to rotate in differential motions to one another, a brake mechanism which enables to selectively fix a rotation element of the power combining mechanism and a brake mechanism which enables to selectively fix a rotation element of the power combining mechanism which is connected to the engine.

An electro-mechanical drive unit connectable with first and second motor/generators includes an output member, a stationary member, a gear-train, and a torque-transmitting device. The drive unit also includes a compound planetary gear arrangement having a ring gear structure, first and second sun gears, and a carrier structure. The gear arrangement includes first, second, third, and fourth junction points and has a double-pinion assembly having a first pinion gear in mesh with the first sun gear member and a second pinion gear in mesh with the first pinion gear and with the ring gear structure. The gear arrangement is operatively connected to the second motor/generator at the first junction point via the gear-train and to the first motor/generator at the fourth junction point. The output member is operatively connected to the second junction point. Furthermore, the torque-transmitting device is engageable to ground the third junction point to the stationary member.

Disclosed is a vehicle transmission capable of improving fuel economy and performance of a vehicle with an increased number of gear stages. The vehicle transmission includes three simple planetary gear sets and one compound planetary gear set or includes five simple planetary gear sets. A shifting operation is performed by changing speed and direction of rotation of gears in a manner of selectively connecting and disconnecting rotary elements of the gear sets and a plurality of friction members. The vehicle transmission provides ten or more forward speed ratios and one or more reverse speed ratios through this shifting operation.

A vehicle control device including a multi-speed transmission switching gear shift positions in accordance with a combination of hydraulic friction engagement devices operations and pressure control solenoid valves, the control device shifting gears by providing a shift output signal including a quick-apply signal to the valves after a first time from a shift request, the control device has: a pulsation drive control portion to control selectively pulsating the pressure control solenoid valves in a cycle; and a quick-apply control prohibiting portion to prohibit a provision of a quick-apply control using the quick-apply signal for a second time from a time of termination of the pulsation drive control, and to permit the provision of the quick-apply control after the elapse of the second time, for a valve having undergone the control, the pulsation drive control portion to terminate the control for a valve when the shift request is made.

A multi-stage transmission is disclosed. The multi-stage transmission includes: two simple planetary gear sets, each including three rotary elements; one compound planetary gear set including four rotary elements; and six shifting elements. Since ten forward shifting stages and one reverse shifting stage can be accomplished with a relatively small number of parts, a simple construction and a low weight, the multi-stage transmission provides a further improved speed ratio for the driving conditions of the vehicle, thereby improving the fuel efficiency of the vehicle.