A transmission control method that improves fuel economy when gear shift and engine clutch release are to be simultaneously performed is provided. A parallel type hybrid electric vehicle having an engine clutch mounted between an electric motor and an engine includes a first controller that executes transmission gear shift during a first control period and a second controller that operates the engine clutch and generates an engine clutch release request. A third controller permits the engine clutch release request to release the engine clutch before the second control period upon determining that a time when the release request has been generated is within a third control period, which is a period before a second control period in which actual shift is generated within the first control period, and a remaining time until a time when the second control period is started is equal to or greater than a critical time.

A stator assembly (50) includes a stator core (52) defining an outside diameter (OD) and an inside diameter (ID) with longitudinally extending slots (58) formed between the inside diameter and the outside diameter. The stator core (52) defines a core height extending longitudinally from a first end (53) to a second end (55) of the stator core (52). Distributed windings (60) are retained by the stator core (52) and include an in-slot portion (66) positioned in the slots of the stator core (52), a first end turn portion (62) adjacent to the first end (53) of the stator core, and a second end turn portion (64) adjacent to a second end (55) of the stator core. The first end turn portion (62) defines a first end turn height (h.sub.1) extending from the first end (53) of the stator core to a vertex (78) of the first end turn portion (62). A ratio of the first end turn height (h.sub.1) to the outside diameter (OD) of the stator core is less than or equal to 0.07.

Provided is a control system (1) for a hybrid vehicle (8) which is configured to directly transmit an output of an internal combustion engine (2) to a driven wheel (17) via a lockup clutch (18) and transmit an output of an electric motor is to the driven wheel by disengaging the lockup clutch depending on an operating state of the vehicle. The control system is configured to activate a warning unit (36, 37) when the oil pressure is below a prescribed oil pressure threshold value and the rotational speed of the engine detected by the rotary encoder is higher than a rotational speed threshold value. The rotational speed threshold value is a first threshold value when the lockup clutch is fully disengaged, and a second threshold value higher than the first threshold value when the lockup clutch is fully engaged, being engaged and being disengaged.

A multi-mode power train and multi-mode vehicle include a power-conversion device that is in communication with an engine via a direct mechanical power-transfer connection extending from the engine to the power-conversion device. A continuously variable power source (CVP) is in communication with the power conversion device via an intermediate power-transfer connection. A lock-up device with first and second engagement states is provided between the engine and the power-conversion device or the CVP. With the lock-up device in the first engagement state, mechanical power from the engine is converted by the power-conversion device for use by the CVP, with the CVP using the converted power to provide mechanical power to a power-output connection. With the lock-up device in the second engagement state, the engine transmits mechanical power through the lock-up device to the power-output connection.

A hybrid power module efficiently delivers both hydraulic power and electric power. The hybrid power module may regenerate and store energy for later use. The module includes and engine and an electric motor for driving a hydraulic pump. The electric motor is operable as a starter motor for the engine and as an assist motor cooperating with the engine to power the hydraulic pump to improve dynamic response of the hydraulic pump. The module also includes an electric power source which may have an energy storage unit, and the electric motor may be operated as an electric generator providing electric energy to the energy storage unit.

A system and method of controlling engine clutch engagement during TCS operation of a hybrid vehicle are provided. The method includes determining whether a TCS is operating and upon determining that the TCS is operating, determining a compensation value for early engagement of an engine clutch during the TCS operation based on a difference between a front wheel speed and a rear wheel speed and a slip amount of front wheels. Additionally, the method includes determining whether engagement of the engine clutch is capable of being started based on the compensation value and starting the engine clutch engagement. Since the engagement of the engine clutch is controlled based on the speed of non-drive wheels during TCS operation, the engagement stability of the engine clutch is improved and the amount of time required to engage the engine clutch is decreased.

A power transmission system for a vehicle includes: an engine; input shafts, at least one of which configured to selectively engage with the engine, 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 gear; a motor power shaft configured to rotate together with one of the output shafts; and a first motor generator configured to rotate together with the motor power shaft, wherein when the motor power shaft is rotated together with one of the output shafts, the first motor generator is configured to generate electric power utilizing at least parts of power generated by the engine while the vehicle in a running state or a parking state. A vehicle including the power transmission system is also provided.

A power transmission system for a vehicle includes: an engine; 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 gear; a generator gear fixed on one of the output shafts; a reverse output gear configured to rotate together with or to disengage from a shift driving gear; an output idler gear configured to engage with one of the output shafts so as to rotate together with the output shaft or disengage from the output shaft so as to rotate with the output shaft at different speeds; a motor power shaft configured to rotate together with the generator gear; and a first motor generator configured to rotate together with the motor power shaft. A vehicle including the power transmission system is also provided.

Systems and methods for operating a transmission of a hybrid powertrain that includes a motor/generator are described. The systems and methods may improve engine starting during engine starts where little or larger driver demand torques are requested. In one example, engine torque may be commanded to a torque based on a filtered driver demand torque, the filtered driver demand torque filtered based on a position of an accelerator pedal.

A hybrid vehicle control device is provided with at least one controller that controls the outputs of the engine and of the motor according to the driving state, the engagement and disengagement of the clutch, and the transmission ratio of the continuously variable transmission. The at least one controller is programmed to start the engine and forcibly downshift the continuously variable transmission to a transmission ratio with which it is possible to start on an uphill road upon determining that the vehicle is on an uphill road while in an electric vehicle mode in which it is possible to travel by the drive force of the motor with the clutch released and the engine stopped.