A hybrid powertrain that includes a combustion engine (4) and a gearbox (2) with an input shaft (8) and an output shaft (20); a first planetary gear (10) connected to the input shaft (8); a second planetary gear (12) connected to the first planetary gear (10); a first electrical machine (14) connected to the first planetary gear (10); a second electrical machine (16) connected to the second planetary gear (12); at least one gear pair (G1, 60, 72) connected to the first planetary gear (10) and to the output shaft (20); and at least one gear pair (G2, 66, 78) connected to the second planetary gear (12) and to the output shaft (20), a countershaft (18) provided between the combustion engine (4) and the gearbox (2) so that the engine (4) can be disconnected from the gearbox (2). Also disclosed is a method for controlling the disclosed hybrid powertrain (3). Also a vehicle (1) includes such a gearbox (2), and a method to control such a gearbox (2). Also a computer program (P) to control a gearbox.

A method of shifting ranges within a transmission is provided. The method of an embodiment includes determining an intention to change from a first mode to a second mode in the transmission, determining the first mode of the transmission, which includes a first range clutch in an engaged condition and a first synchronizer in a first engaged condition, determining the second mode of the transmission, which includes a second range clutch in an engaged condition and a second synchronizer in a first engaged condition, engaging the second synchronizer in the first engaged condition, disengaging the first range clutch, engaging the second range clutch, and disengaging the first synchronizer from the first engaged condition.

A hybrid drive module, comprising a housing (170) enclosing a chain drive (120) connecting an electrical motor (110) with a crank shaft (22) of an associated internal combustion engine (20) via at least one coupling (130, 140). Said housing (170) further comprises a reservoir (190) having an inlet (212) configured to receive oil from the chain (126) during operation, and an outlet (214, 214′) arranged to distribute oil back to the chain (126).

A hybrid powertrain that includes a combustion engine (4) and a gearbox (2) with an input shaft (8) and an output shaft (20); a first planetary gear (10) connected to the input shaft (8); a second planetary gear (12) connected to the first planetary gear (10); a first electrical machine (14) connected to the first planetary gear (10); a second electrical machine (16) connected to the second planetary gear (12); at least one gear pair (G1, 60, 72) connected to the first planetary gear (10) and to the output shaft (20); and at least one gear pair (G2, 66, 78) connected to the second planetary gear (12) and to the output shaft (20), a countershaft (18) provided between the combustion engine (4) and the gearbox (2) so that the engine (4) can be disconnected from the gearbox (2). Also disclosed is a method for controlling the disclosed hybrid powertrain (3). Also a vehicle (1) includes such a gearbox (2), and a method to control such a gearbox (2). Also a computer program (P) to control a gearbox.

Methods and systems are provided for controlling an engine speed in a hybrid vehicle system during steady-state conditions and in response to transient acceleration and/or deceleration requests. In one example, an engine speed is controlled to an optimal engine speed for fuel economy during steady-state conditions, and in response to an acceleration or deceleration request, a target engine speed is obtained from a rate-limited optimal engine speed to vehicle speed ratio, and the engine is controlled to the target engine speed provided the target speed is below a threshold difference from optimal engine speed. In this way, the vehicle system may simulate a fixed ratio transmission during accelerations and decelerations, while maintaining optimal engine speed for fuel economy at steady state.

A hybrid powertrain that includes a combustion engine (4) and a gearbox (2) with an input shaft (8) and an output shaft (20); a first planetary gear (10) connected to the input shaft (8); a second planetary gear (12) connected to the first planetary gear (10); a first electrical machine (14) connected to the first planetary gear (10); a second electrical machine (16) connected to the second planetary gear (12); at least one gear pair (G1, 60, 72) connected to the first planetary gear (10) and to the output shaft (20); and at least one gear pair (G2, 66, 78) connected to the second planetary gear (12) and to the output shaft (20), a countershaft (18) provided between the combustion engine (4) and the gearbox (2) so that the engine (4) can be disconnected from the gearbox (2). Also disclosed is a method for controlling the disclosed hybrid powertrain (3). Also a vehicle (1) includes such a gearbox (2), and a method to control such a gearbox (2). Also a computer program (P) to control a gearbox.

A hybrid electric vehicle which may effectively determine a point in time of shift pattern change and a method of controlling a shift pattern therefor are disclosed. The method includes determining whether or not a request for shift pattern change is received, determining HEV mode related conditions, in response to a determination that the request for shift pattern change is received, and changing a shift pattern according to the request for shift pattern change, in response to a determination that the HEV mode related conditions are satisfied.

A method of controlling a drive train comprising an electric motor (12), a gearbox (1) and an internal combustion engine (13). The gearbox (1) is placed between the electric motor (12) and the internal combustion engine (13) in the drive train. The speed of the electric motor (12) is synchronized to the speed of the internal combustion engine (13) in order to shift the gearbox. The gearbox (1) is shifted between different operation modes by means of controlling the position of a dog clutch (6).

A method for controlling a motor torque of a hybrid electric vehicle is provided. The method may include: detecting, with a controller, a downshift request during a regenerative braking; determining, with the controller, a target gear stage and a motor torque command, wherein the motor torque command is determined at a pre-shift stage before entering into a torque intervention; determining, with the controller, a motor torque command of the target gear stage; determining, with the controller, an intervention torque based on the motor torque command and the motor torque command of the target gear stage during a downshift control process; and controlling a torque intervention to control a regenerative operation of the motor based on the intervention torque, wherein determining the intervention torque includes changing the intervention torque from the motor torque command to a target value, which is set as the motor torque command of the target gear stage, during a shift control process.

A gearbox having an input shaft (8) and an output shaft (20); a first epicyclic gear (10) connected to the input shaft (8); a second epicyclic gear (12) connected to the first epicyclic gear (10); a first electrical machine (14) connected to the first epicyclic gear (10); a second electrical machine (16) connected to the second epicyclic gear (12); a first main shaft (34) connected to the first epicyclic gear (10); a second main shaft (36) connected to the second epicyclic gear (12). A first coupling unit (56) disengagingly connects two rotatable components (22, 26, 50) at the first epicyclic gear (10), and a second coupling unit (58) disengagingly connects two rotatable components (28, 32, 51) at the second epicyclic gear (12), such that at least one of the rate of revolution and the torque at the first and the second main shafts (34, 36) can be influenced by controlling at least one of the first and the second coupling units (56, 58) to a condition of the rotatable components (22, 26, 50; 28, 32, 51) that is engaged or disengaged. Also a vehicle (1) having such a gearbox (2), a method to control such a gearbox (2), a computer program (P) to control a gearbox, and a computer program product comprising program code for an electronic control unit (48) or another computer (53) in order to implement the method.