A vehicle transmission includes first and second input gear shafts, an intermediate gear shaft and an output gear shaft. The first input gear shaft has a first torque transmission member, and the second input gear shaft has a first gear wheel. The intermediate gear shaft has second and third gear wheels. The output gear shaft has a fourth gear wheel and a second torque transmission member. The third gear wheel and the fourth gear wheel are arranged to interact with each other for transferring torque from the intermediate gear shaft to the output gear shaft. The first gear wheel and the second gear wheel are arranged to interact with each other for providing a first gear ratio. The first torque transmission member and the second torque transmission member are arranged to interact with each other via a flexible member for providing a second gear ratio.

Presented are engine disconnect clutches, methods for making/using such clutch devices, and vehicles with an engine that is coupled to/decoupled from a transmission and motor via a disconnect clutch. A vehicle includes a transmission with an input shaft connected with a transmission gearing arrangement, and an output shaft connecting the gearing arrangement with the vehicle's wheels. A torque converter pump housing drivingly connects to the vehicle's traction motor. A turbine is mounted inside the pump housing in fluid communication with an impeller. A turbine shaft connects the turbine to the transmission's input shaft. A clutch hub of a disconnect clutch drivingly connects to the vehicle's engine and selectively attaches to the pump housing. The disconnect clutch selectively connects the engine to the motor and transmission by drawing oil from the transmission's oil sump, through a turbine shaft channel and a pump housing port, and into a clutch hub cavity.

A powertrain for a vehicle includes an engine, a first motor serving as a motor for driving of a vehicle or serving as a generator, a first power transmission mechanism disposed between the engine and the first motor to transmit the power of the engine to the first motor or to cut off transmission of power between the engine and the first motor, a second power transmission mechanism disposed between the first motor and a driving shaft of running wheels to transmit the power of the first motor to the driving shaft of the running wheels or to cut off transmission of power between the first motor and the driving shaft of the running wheels, and a second motor connected to the second power transmission mechanism via a third power transmission mechanism to transmit power to the second power transmission mechanism and outputting power for driving the vehicle and transmit the power to the driving shaft of the running wheels.

While a vehicle is traveling in an automatic driving mode, an auto-driving oil pressure changing unit makes the engagement pressure of hydraulic oil supplied to a release-side engagement device to be released during a downshift of a stepwise shifting unit, higher than the engagement pressure set during traveling in a manual driving mode, so that retraction of the acceleration due to a drop of drive torque during the downshift is reduced. At this time, an auto-driving rotating machine controller makes drive-side MG2 torque generated from a second rotating machine, larger than that generated during traveling in the manual driving mode, so as to speed up the progress of the downshift, and prevent retraction of the acceleration from being prolonged.

A drive control apparatus includes a motor control unit and a gear shift control unit, and controls a power transmission system including first and second motors and a gear shift mechanism. When the gear shift mechanism is changed from a first gear stage to a second gear stage during deceleration of the vehicle, the motor control unit controls the first motor to be at a target rotation speed determined based on a gear ratio of a second power transmission gear and a rotation speed of an output shaft, and controls a second motor such that required brake torque is generated by the second motor. The gear shift control unit controls the gear shift mechanism so as to be in a neutral state in which power is not transmitted between an input shaft and the output shaft, until a rotation speed of the first motor becomes the target rotation speed.

The present disclosure provides a transmission for a hybrid vehicle, including a main clutch and a sub-clutch which are disposed on a first input shaft and a second input shaft to selectively transfer power from an engine to an output shaft. First and second pairs of engine-side gears having different gear ratios are meshed with the sub-clutch and the output shaft and with the second input shaft and the output shaft, such that a pair of gears is selected. A third input shaft rotates using power received from a motor. A plurality of pairs of motor-side gears having different gear ratios are meshed with the third input shaft and the output shaft, such that a pair of gears appropriate to the speed of the vehicle is selected by a motor-side engaging/disengaging unit. A one-way clutch allows power to be only transferred from the third input shaft to the output shaft.

The present invention generally relates to automatic transmission controllers and related methods. In one case, the present invention provides a method of calibrating a controller to match an automatic transmission to an electric motor or internal combustion engine. The controller is not integrated into the transmission. The method comprises adjusting parameters of the controller and includes the steps of: a) Defining the Control Architecture; b) using the Defined Control Architecture to Identify Control Loop Input/Output; c) using the Identified Control Input/Output to Define the Control Algorithm Controller; d) using the Control Algorithm Controller definition to either Define the Shift Schedule or Define the Solenoid Handler, either of which can be used in Optimizing Calibration Via Testing.

A transmission unit includes: input shafts, each of the input shafts being provided with a shift driving gear thereon; output shafts, each of the output shafts being provided with a shift driven gear configured to mesh with a corresponding shift driving; a motor power shaft configured to rotate together with one of the output shafts; and an output unit configured to rotate with one of the output shafts at different speeds and configured to selectively engage with one of the output shafts so as to rotate together with one of the output shafts. A power transmission system including the transmission unit and a vehicle including the power transmission system are also provided.

In a non-forward range, the same gear position as a forward first gear position is established in a stepped transmission. A hydraulic controller includes a second linear solenoid valve and third linear solenoid valve that respectively supply hydraulic pressure to a second clutch and first brake, and a selector valve that is provided in an oil passage upstream of the second and third linear solenoid valves and that switches between a state where hydraulic pressure is supplied to the oil passage and a state where supply of hydraulic pressure is cut off. When the non-forward range is set or when a vehicle is moving backward, the selector valve cuts off supply of hydraulic pressure to the oil passage. Thus, when there is a failure in the second or third linear solenoid valve, it is possible to suitably establish a gear position wherein the vehicle is not allowed to move backward.

An engine and a motor are arranged on different rotational axes. A driven gear shaft is arranged to rotate about the rotational axis shared with a rotor shaft of the motor. The driven gear shaft is connected to the rotor shaft of the motor for power transmission. The rotor shaft is rotatably supported by a first bearing. The rotor shaft and the driven gear shaft are formed of different shafts. The driven gear shaft is configured to extend in a shaft direction toward the rotor shaft side. A second bearing is arranged in an extended portion. The output shaft is arranged to rotate about the rotational axis shared with the rotor shaft of the motor. The output shaft is connected to the rotor shaft for power transmission. The output shaft is connected to a drive wheel for power transmission.