A hybrid power system and an operating method, a torque distribution method and a gear shifting control method of the same. A transmission of the hybrid power system employs two independent input shafts and two motors which are in transmission connection with the two input shafts respectively, and an engine is in transmission connection with one of the two motors via a clutch. In this way, in one aspect, a torque compensation can be constantly carried out in a gear shift process of the hybrid power system, thereby avoiding a torque interruption phenomenon for the hybrid power system in the gear shift process; in the other aspect, the hybrid power system can enable a serial mode in which one motor is driven by the engine to charge a battery while the other motor is driven to transmit torque to the transmission for driving.

In a method for controlling a multi-clutch transmission of a vehicle, wherein the multi-clutch transmission is adapted to be shifted either with a power shift or a power cut shift dependent on predetermined vehicle variables, a power shift to a higher gear in low range gear is detected, and, when the power shift to a higher gear in low range gear has been detected, a previously set gear shift strategy is overruled and the multi-clutch transmission is controlled such that a forthcoming gear shift is performed as a power shift.

A displayed rotation speed control apparatus for a hybrid vehicle includes: a displayed rotation speed controller having a display mode in which a target primary rotation speed stepwisely set is displayed as a driving source rotation speed in the rotation speed display device in the simulated stepwise shift mode, when the mode is switched from the EV mode to the HEV mode to initiate a starting of the engine, and when the mode is switched from the continuous shift mode to the simulated stepwise shift mode while an actual engine speed is smaller than a predetermined rotation speed, the displayed rotation speed controller being configured to display a value obtained by retarding the actual engine speed, during a period from the initiation of the starting of the engine to a rotation speed smaller than a predetermined rotation speed.

A displayed rotation speed control apparatus for a hybrid vehicle includes: a displayed rotation speed controller having a display mode in which a target primary rotation speed stepwisely set is displayed as a driving source rotation speed in the rotation speed display device in the simulated stepwise shift mode, when the mode is switched from the EV mode to the HEV mode to initiate a starting of the engine, and when the mode is switched from the continuous shift mode to the simulated stepwise shift mode while an actual engine speed is smaller than a predetermined rotation speed, the displayed rotation speed controller being configured to display a value obtained by retarding the actual engine speed, during a period from the initiation of the starting of the engine to a rotation speed smaller than a predetermined rotation speed.

The present application describes a method of controlling a vehicle, wherein the vehicle comprises a hybrid powertrain including an electric propulsion system, an engine and a drivetrain that is configurable in a low-range mode or a high-range mode. The method comprises determining whether the low-range mode for the drivetrain is selected, determining whether an electric mode for the powertrain is selected, and inhibiting operation of the engine if both the low-range mode and the electric mode are selected.

A hybrid powertrain includes a torque provider, an automatic transmission without a torque converter, and a transfer case configured for providing four wheel drive low range. A controller receives a signal indicative of the transfer case being in low range and determines if brake pedal torque is indicative of a brake pedal being released and, if so, commands engagement of a launch clutch of the transmission up to maximum creep torque capacity at a predetermined maximum gradient. The controller determines when torque provider speed is synchronized with vehicle creep speed, and upon such determination, controls the launch clutch to fully engage to a lock up state to mimic behavior of engagement of a manual transmission gear when the hybrid powertrain is in low range to thereby substantially eliminate a time lag associated with automatic transmissions having a torque converter or a constantly slipping launch clutch.

Aspects of the present invention relates to a vehicle control system (1) for controlling a vehicle transfer case (3). The transfer case (3) is operable in a high range and a low range. The vehicle control system (1) is configured to output a range change signal to implement a transfer case range change. The vehicle control system (1) also outputs a brake control signal for controlling vehicle braking during the range change. The present invention also relates to a vehicle (5) and a related method of operating a vehicle control system (1) and optionally also a transmission (7).

Aspects of the present invention relates to a vehicle control system (1) for controlling a vehicle transfer case (3). The transfer case (3) is operable in a high range and a low range. The vehicle control system (1) is configured to output a range change signal to implement a transfer case range change. The vehicle control system (1) also outputs a brake control signal for controlling vehicle braking during the range change. The present invention also relates to a vehicle (5) and a related method of operating a vehicle control system (1) and optionally also a transmission (7).

A vehicle control device separately controls driving powers distributed to right and left wheels. The vehicle control device is configured to execute a vehicle posture control for reducing the driving powers transmitted from a driving source to the wheels by a request from a vehicle side. The vehicle control device includes a slip detection unit and a torque control unit. The slip detection unit is configured to detect a slip in the wheels. The torque control unit is configured to determine whether to perform a torque control after an operation of the vehicle posture control according to a detection result of the slip and a state of a transmission. The torque control is a control to control a torque input to the transmission by a request from the transmission side. The torque control unit is configured to execute the torque control on the basis of a determination result.

A vehicle control device separately controls driving powers distributed to right and left wheels. The vehicle control device is configured to execute a vehicle posture control for reducing the driving powers transmitted from a driving source to the wheels by a request from a vehicle side. The vehicle control device includes a slip detection unit and a torque control unit. The slip detection unit is configured to detect a slip in the wheels. The torque control unit is configured to determine whether to perform a torque control after an operation of the vehicle posture control according to a detection result of the slip and a state of a transmission. The torque control is a control to control a torque input to the transmission by a request from the transmission side. The torque control unit is configured to execute the torque control on the basis of a determination result.