Transmission for a hybrid drive arrangement

Abstract

Transmission (100) for a hybrid drive arrangement, which can be coupled with two drive units (7, 8), with an input wave (10) and an output wave (11), at least one first and one second switching element (SE1, SE2), at least one first and one second planetary gear set (5,6) wherein the input shaft (10) is coupled to the planet carrier of the first planetary gear set (5), wherein the sun gear of the second planetary gear (6) can be coupled to the ring gear of the first planetary gear (5) by means of the first switching element (SE1) and to the planet carrier of the first planetary gear (5) by means of the second switching element (SE2), wherein the sun gear of the first planetary gear (5) is coupled to the ring gear of the second planetary gear (6), and the output shaft (11) is coupled to the planet carrier of the second planetary gear (6).

Description

[0001] The invention relates to a transmission for a hybrid drive arrangement. Furthermore, the invention relates to a hybrid drive arrangement with a transmission, a vehicle with a hybrid drive arrangement, a method for operating the hybrid drive arrangement, a computer program, and a machine-readable storage medium. State of the art

[0002] Transmissions for hybrid drive systems are known from the prior art. For example, WO2010 / 009943 A1 discloses a dual-clutch transmission that enables the operation of a hybrid vehicle using the internal combustion engine, the electric motor, and both drive units simultaneously. Such transmissions are complex, heavy, and expensive. There is a need for transmission topologies with reduced mechanical complexity, reduced space requirements, and reduced weight.

[0003] The terms "coupled" and "attached" are used below to refer to a fixed connection. In contrast, the term "connectable" encompasses both fixed and switchable connections within the context of this description. If a switchable connection is specifically meant, the corresponding switching element, in particular a brake or a clutch, is usually explicitly stated. However, if a fixed, rigid, or rotationally fixed connection is specifically meant, the terms "coupled" and "attached" are generally used, and the term "connectable" is omitted. The use of the term "connectable" without specifying a concrete switching element thus indicates the intention to include both cases.This distinction is made solely for the sake of clarity and, in particular, to clarify where the provision of a switchable connection is absolutely necessary instead of a fixed connection or coupling, which is generally easier to implement. The above definition of the term "coupled" or "attached" should therefore not be interpreted so narrowly as to allow couplings arbitrarily inserted for circumvention purposes to deviate from its literal meaning. Disclosure of the invention

[0004] A transmission for a hybrid drive arrangement is provided, which can be coupled to two drive units, with an input shaft and an output shaft, at least one first and one second switching element, and at least one first planetary gear and one second planetary gear, wherein the input shaft is coupled to the planet carrier of the first planetary gear. wherein the sun gear of the second planetary gear can be coupled to the ring gear of the first planetary gear by means of the first switching element and to the planet carrier of the first planetary gear by means of the second switching element , wherein the sun gear of the first planetary gear is coupled to the ring gear of the second planetary gear, and the output shaft is coupled to the planet carrier of the second planetary gear.

[0005] A transmission for a hybrid drive arrangement is provided. Two drive units can be coupled to the transmission for the operation of the hybrid drive arrangement. The transmission comprises an input shaft and an output shaft, at least one first and one second switching element, and at least one first planetary gear set and one second planetary gear set. The input shaft is coupled to the planet carrier of the first planetary gear set. For the purposes of this description, a coupling is understood as a connection that is rigid, for example, integral, such as by means of a shaft, or with a fixed gear ratio or gear stage. The output shaft is coupled to the planet carrier of the second planetary gear set. The sun gear of the first planetary gear set is coupled to the ring gear of the second planetary gear set. The ring gear of the first planetary gear set can be coupled to the sun gear of the second planetary gear set by means of the first switching element.The second switching element allows the planet carrier of the first planetary gear set to be coupled to the sun gear of the second planetary gear set. In particular, the output shaft can be coupled to an output shaft. The output shaft is, in particular, at least one shaft or axle that transmits the motion of the output shaft to the mechanical drivetrain of a vehicle, for example, to a differential or a drive wheel. Advantageously, a transmission is provided which, when the first and second switching elements are closed, transmits the speed and torque applied to the input shaft to the output shaft according to the gear ratios in the transmission. When the first and second switching elements are open, the input shaft is decoupled from the output shaft.

[0006] In another embodiment of the invention, the transmission comprises a third switching element which is configured to brake or release the ring gear of the first planetary transmission.

[0007] The transmission includes a third switching element that allows the ring gear of the first planetary gear to be released or braked, specifically by engaging or supporting the ring gear against a fixed point or housing of the transmission. Braking the ring gear of the first planetary gear involves reducing its rotational speed, particularly to a standstill. Releasing the ring gear involves releasing the brake, allowing the ring gear to accelerate according to the forces acting upon it. Advantageously, the transmission topology described so far, with its first to third switching elements, allows for the setting of additional operating modes beyond those already mentioned. For example, with the third and first or second switching elements closed, the second-lowest speed is achieved.the lowest gear ratio achievable with this gearbox between the input shaft and the output shaft.

[0008] In another embodiment of the invention, the transmission comprises a fourth switching element which is configured to brake or release the sun gear of the first planetary gear.

[0009] The transmission includes a fourth switching element that allows the sun gear of the first planetary gear set to be released or braked, specifically by engaging or supporting the sun gear against a fixed point or housing of the transmission. Braking the sun gear involves reducing its rotational speed, particularly to a standstill. Releasing the sun gear involves releasing the brake, allowing it to accelerate according to the forces acting upon it. Advantageously, the transmission topology described above, with its first through fourth switching elements, allows for the setting of additional operating modes beyond those already mentioned.Thus, with the fourth and second or first switching elements closed, a particularly high or second-highest gear ratio achievable with this transmission is obtained between the input shaft and the output shaft. In a further embodiment of the invention, the first, second, and / or third switching element comprises a clutch.

[0010] To connect the sun gear of the second planetary gear set to the aforementioned components of the first planetary gear set, the first and / or the second switching element is designed as a clutch. Such a clutch can be, in particular, a dry clutch, a wet clutch, or a dog clutch. Advantageously, options are provided for a controllable connection of the components of the first and second planetary gear sets.

[0011] In another embodiment of the invention, the third and / or fourth switching element comprises a brake.

[0012] The third and / or fourth switching element is designed as a brake, in particular a dry or wet brake or a dog clutch. Advantageously, a means of controllable release and braking of the components of the first and second planetary gear sets is provided.

[0013] In another embodiment of the invention, a first drive unit, in particular an internal combustion engine, can be coupled to the input shaft and / or a second drive unit, in particular an electric machine, can be coupled to the sun gear of the second planetary gear set.

[0014] The first drive unit can be coupled to the input shaft. The second drive unit can be coupled to the sun gear of the second planetary gear set. Advantageously, for generator operation of the second drive unit, for example, an electric machine, such as for charging a battery, the first drive unit or the internal combustion engine can be connected to the electric machine by closing the second switching element and opening the first, second, and fourth switching elements. Since both drive units are decoupled from the output shaft in this process, and thus no torque is transmitted to the output shaft, this charging can take place when the output shaft is stationary, for example, while a vehicle is stationary (stationary charging).For example, if the output shaft is stationary, a direct transfer of the rotational energy from the first drive unit to the second drive unit or vice versa is enabled, for example to start an internal combustion engine.

[0015] A power-split operation of the transmission (eCVT mode) is enabled by closing the third shift element and opening the first, second, and fourth shift elements. In this mode, the first drive unit indirectly acts on the ring gear of the second planetary gear set, and the electric motor acts on the sun gear of the second planetary gear set, whose planet carrier is connected to the output shaft. The gear ratio between the input and output shafts can be continuously varied over a wide range by specifying a speed or torque of the second drive unit. This advantageously enables power-split operation, also known as eCVT mode, in which both the propulsive power at the output shaft and the charging power for the generator operation of the electric motor can be adjusted independently. Charging while stationary or creeping (>0 km / h to approx.10km / h) and a smooth, comfortable transition from stationary charging mode to creep charging mode and fixed gear driving mode.

[0016] With the fourth switching element closed, the second drive unit is connected to the output shaft via a fixed gear ratio, so that the output shaft can only be driven by the second drive unit at this fixed ratio. By closing the second switching element, particularly in a metered manner, the first drive unit can be engaged and, for example, started from the vehicle's position using the second drive unit, if the first drive unit is an internal combustion engine.

[0017] It is also possible that the first drive unit is designed as an electric machine and the second drive unit as an internal combustion engine. In such a configuration, the transmission can enable other functionalities and operating modes for the interaction of the components, which will not be discussed further here.

[0018] In another embodiment of the invention, the changing of the transmission ratios of the gearbox is carried out without interrupting the traction force.

[0019] Changing the transmission ratios, in particular shifting to a different gear or operating mode, occurs without interrupting traction if, especially when changing from one operating mode to another, one of the shifting elements remains in its current state, a second shifting element moves from a closed to an open state, and a third shifting element moves from an open to a closed state. Advantageously, a transmission is provided in which gear changes are possible without interrupting traction.

[0020] In another embodiment of the invention, the transmission comprises a control system for controlling at least one of the switching elements depending on a predetermined operating signal.

[0021] A control system is provided which, depending on a predefined operating signal, such as a requested torque, a predefined speed, or a specific operating point of the drive units, activates at least one of the switching elements. The aforementioned parameters of the operating signal can refer to the output shaft of the transmission, the input shaft, or the shafts to be connected to the drive units. Advantageously, this enables control of the transmission.

[0022] Furthermore, the invention relates to a hybrid drive arrangement with a gearbox, wherein the hybrid drive arrangement comprises a second drive unit and / or a pulse inverter, electrical energy source or a first drive unit.

[0023] A hybrid drive arrangement with a previously described transmission is provided. The hybrid drive arrangement comprises a second drive unit. In particular, the hybrid drive arrangement comprises a pulse inverter, an electrical energy source, and / or a first drive unit. The second drive unit is, in particular, coupled or connected to the sun gear of the second planetary gear set. The pulse inverter is intended, in particular, to supply the second drive unit, especially an electric machine. For this purpose, it converts, in particular, the electrical energy from an electrical energy source, for example, a battery and / or a fuel cell. The first drive unit is, in particular, coupled or connected to the input shaft. Advantageously, a hybrid drive arrangement configured for use in a vehicle is provided.

[0024] Furthermore, the invention comprises a vehicle with a described hybrid drive arrangement. Advantageously, a vehicle is provided which includes a hybrid drive arrangement.

[0025] Furthermore, the invention comprises a method for operating a hybrid drive arrangement with a transmission. The method comprises the following steps: determining an operating control signal;

[0026] Controlling at least one of the switching elements to adjust the functionality of the transmission depending on the operating preset signal (BV).

[0027] A method for operating a hybrid drive arrangement with a transmission is provided. An operating setpoint signal is determined. At least one of the switching elements is opened or closed, depending on the operating setpoint signal, to adjust the functionality of the transmission or a corresponding operating mode. The operating setpoint signal is determined based on an operating strategy, a driver request or accelerator pedal input, a battery management system, or other systems available in a vehicle, for example. Depending on this operating setpoint signal, the switching elements are controlled to adjust the corresponding functionality or operating mode of the transmission, in particular the clutches or brakes are opened or closed.The functionality of the transmission or the operating mode includes, in particular, the different gear ratios of the various gear stages, or the different modes or operating modes, for example, generator operation of the second drive unit with the output shaft stationary, or the eCVT mode. Advantageously, a method for operating the hybrid drive arrangement is provided.

[0028] Furthermore, the invention relates to a computer program that is configured to execute the described method.

[0029] Furthermore, the invention relates to a machine-readable storage medium on which the described computer program is stored.

[0030] It is understood that the features, properties, and advantages of the transmission apply accordingly to the hybrid drive arrangement, the vehicle, or the method, and vice versa. Further features and advantages of embodiments of the invention will become apparent from the following description with reference to the accompanying drawings. Brief description of the drawings

[0031] The invention will be explained in more detail below using some figures, including: Fig. 1: A schematic representation of the hybrid powertrain arrangement with a gearbox. Fig. 2: a gearbox shift matrix. Fig. 3: A schematically represented vehicle with a hybrid powertrain arrangement. Fig. 4: A schematically illustrated method for operating a hybrid powertrain arrangement. Embodiments of the invention

[0032] The Fig. Figure 1 shows a hybrid powertrain arrangement 200 with a first drive unit 7, in particular an internal combustion engine, and a second drive unit 8, in particular an electric machine, and a transmission 100. In particular, the hybrid powertrain arrangement includes a pulse inverter 60 for supplying the second drive unit 8 with electrical energy. The hybrid powertrain arrangement 200 further includes, in particular, an electrical energy source 70, which is connected to the pulse inverter 60. The transmission 100 comprises the input shaft 10 and the output shaft 11. The transmission 100 further comprises a first planetary gear set 5 and a second planetary gear set 6. The transmission 100 further comprises a first and a second switching element SE1, SE2. The first switching element SE1, in particular a clutch, is configured to connect or disconnect the sun gear of the second planetary gear set 6 from the ring gear of the first planetary gear set 5.The second switching element SE2, in particular a clutch, is configured to connect the sun gear of the second planetary gear set 6 to the planet carrier of the first planetary gear set 5. Furthermore, the transmission 100 can have a third switching element SE3. The third switching element SE3, in particular a brake, is configured to release or brake the ring gear of the first planetary gear set 5, in particular by connecting the ring gear to a fixed point or, for example, by supporting it on the housing (not shown) of the transmission 100. Furthermore, the transmission 100 can include a fourth switching element SE4. The fourth switching element SE4, in particular a brake, is configured to release or brake the sun gear of the first planetary gear set 5 and the connected ring gear of the second planetary gear set 6, in particular by connecting the sun gear to a fixed point or, for example, by supporting it on the housing (not shown) of the transmission 100.the ring gear connects to a fixed point or, for example, is supported on the housing (not shown) of the gearbox 100. The gearbox is further designed to be coupled or connected to a first drive unit via the input shaft 10 for operation. In the . Fig. Figure 1 shows that the shaft of the drive unit 7 is connected to the input shaft 10, in particular via a spur gear set. The second drive unit 8, in particular an electric machine, is used for the operation of the gearbox 100 as shown in the Fig. The output shaft 11 is connected to the sun gear of the second planetary gear set 6, as shown in Figure 1. To optimize the transmission ratios, the output shaft 11 is connected, for example, via an output shaft 12, in particular a spur gear set, to a differential 14, through which the movements are transmitted to the wheels 310. A control unit 50 is provided for controlling the switching elements, which executes the method for operating the hybrid drive arrangement with the transmission. For clarity, the control lines between the control unit 50 and the individual switching elements SE1..SE4 are only indicated by arrows and are not shown in full. Communication between the switching elements SE1..SE4 and the device can take place via the control lines, a bus system, or wirelessly.

[0033] Fig. Figure 2 shows a shift matrix of the transmission. The columns list the individual shift elements SE1 to SE4, and the last column shows an example of an approximate gear ratio between one of the drive units and the output shaft. The rows indicate the different gears, gears, or operating modes of the transmission. Crosses in the shift matrix show which shift element must be activated for the corresponding gear or operating mode to be engaged. Activation of the shift elements here means, in particular, that a clutch is engaged or a brake is applied, so that force is transmitted from one shaft to another via the clutch, or force is transmitted to a fixed point, especially the transmission housing, via the brake. The shift matrix shows that, depending on the combination of the four shift elements, five gears G1..... are available.The gear ratios can be set to G5, with first gear G1 having the highest gear ratio and fifth gear G5 the lowest. In gears G1 through G5, a fixed speed ratio corresponding to the gear ratio specified in the last column is preferably maintained between the first drive unit 7 and the output shaft 11. In gears G1 through G5, the output shaft is driven either by the first drive unit 7 alone or together with the second drive unit 8. These are particularly suitable for internal combustion engines or hybrid systems, for example, when the first drive unit 7 is an internal combustion engine and the second drive unit 8 is an electric motor. These gears also allow for an increase in the load point of the internal combustion engine, enabling the electric motor to operate as a generator and allowing battery charging during operation, particularly while driving a vehicle.In the following rows of the matrix, gear E1, or operating mode, is activated, in which only the second drive unit 8 is connected to the output shaft 11. For this to occur, the first, second, and third switching elements SE1, SE2, S3 must be open, and the fourth switching element SE4 must be closed, so that there is no connection to the first drive unit 7. This is, in particular, an electric motor gear, for example, when the second drive unit is an electric motor. Advantageously, a vehicle can be operated locally emission-free in this gear. For example, connecting the second drive unit 8 to the output shaft 11 via the fourth switching element SE4 results in the gear ratio between the second drive unit 8 and the output shaft 11 specified in the switching matrix.

[0034] Closing the third switching element SE3 and opening the remaining switching elements SE1, SE2, SE4 results in a power-split operation, the eCVT1 mode, which enables independent propulsion power at the output shaft 11 and charging power of the second drive unit 8. This operating mode is particularly suitable for hybrid starting at low battery charge levels, as stepless changes in the gear ratios and thus, in particular, stepless acceleration with simultaneous generator operation of the second drive unit 8 are possible.

[0035] Another mode, CH1, also called standby charging, occurs when the second switching element is closed and the first, third, and fourth switching elements are open. In this mode, the drive units 7 and 8 are coupled together, but there is no connection to the output shaft 11. In this operating mode, while the output shaft, particularly of a vehicle, is stationary, the first drive unit 7 can drive the second 8, for example, as a generator to charge an electrical energy source 70, especially a battery. Alternatively, the second drive unit 8 can also drive the first 7, for example, to start or diagnose an internal combustion engine, provided the first drive unit 7 is an internal combustion engine and the second drive unit 8 is an electric machine.

[0036] Fig. Figure 3 shows a vehicle 300 with wheels 310, the vehicle comprising a hybrid drive arrangement 200 as described above.

[0037] Fig.Figure 4 shows a flowchart of a process 400 for operating a hybrid drive arrangement 200 with a transmission 100. The process starts with step 405. In step 410, an operating setpoint signal BV is determined, and in step 420, at least one of the switching elements SE1...SE4 is controlled to adjust the functionality of the transmission 100 depending on the operating setpoint signal BV. The process ends with step 425. The operating setpoint signal BV is either a parameter for a physical quantity in the transmission 100, such as torque or speed, or a power to be transmitted, which is present or to be transmitted at a component of the transmission 100. These components are, in particular, the input shaft 10, the output shaft 11, but also the parameters at the drive units 7, 8, or the switching elements SE1...SE4. In addition, the operating setpoint signal BV can also specify a particular operating mode, such as one of the five gears G1...G5 or gear E1, which is operated only with the second drive unit, or the special functions eCVT1 or CH1 (stationary mode), are represented. Depending on this operating preset signal BV, the switching elements SE1 to SE4 are controlled according to the shift matrix to shift the transmission 100 into the corresponding gear or operating mode. For a seamless shift between the individual gears or operating modes, it is necessary that one of the switching elements SE1...SE4 maintains its state before and after the shift, while another switching element changes from the open to the closed state during the shift, and yet another changes from the closed to the open state.

Claims

[1] Transmission (100) for a hybrid drive arrangement, which can be coupled with two drive units (7, 8), with an input wave (10) and an output wave (11), at least one first and one second switching element (SE1, SE2), at least one first and one second planetary gear set (5,6) wherein the input shaft (10) is coupled to the planet carrier of the first planetary gear set (5), wherein the sun gear of the second planetary gear (6) can be coupled to the ring gear of the first planetary gear (5) by means of the first switching element (SE1) and to the planet carrier of the first planetary gear (5) by means of the second switching element (SE2), wherein the sun gear of the first planetary gear (5) is coupled to the ring gear of the second planetary gear (6), and the output shaft (11) is coupled to the planet carrier of the second planetary gear (6). [2] Transmission according to claim 1, comprising a third switching element (SE3) which is configured to brake or release the ring gear of the first planetary transmission (5). [3] Transmission according to claim 1 or 2, comprising a fourth switching element (SE4) which is configured to brake or release the sun gear of the first planetary gear (5). [4] Transmission according to any of the preceding claims, wherein the first and / or the second switching element (SE1, SE2) comprises a clutch. [5] Transmission according to one of claims 2 or 3, wherein the third and / or the fourth switching element (SE3, SE4) comprises a brake. [6] Transmission according to one of the preceding claims, wherein a first drive unit (7), in particular an internal combustion engine, can be coupled to the input shaft (10) and / or a second drive unit (8), in particular an electric machine, can be coupled to the sun gear of the second planetary gear (6). [7] Transmission according to one of the preceding claims, wherein a change in the transmission ratios of the transmission (100) is carried out without interruption of traction. [8] Transmission according to one of the preceding claims, comprising a control (50) for controlling at least one of the switching elements (SE1..SE4) depending on a predetermined operating control signal (BV). [9] Hybrid drive arrangement (200) with a transmission (100) according to any one of claims 1 to 8, wherein the hybrid drive arrangement comprises a second drive unit (8) and / or a pulse inverter (60), battery (70) or a first drive unit (7). [10] Vehicle (300) with a hybrid drive arrangement (200) according to claim 9. [11] Method (400) for operating a hybrid drive arrangement (200) with a transmission (100) according to any one of claims 1-8 comprising the steps: Determining (410) an operating target signal (BV) Control (420) at least one of the switching elements (SE1..SE4) to adjust the functionality of the transmission (100) depending on the operating preset signal (BV). [12] Computer program configured to perform the method (400) according to claim 11. [13] Machine-readable storage medium on which the computer program according to claim 12 is stored.

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