Hybrid power system

Abstract

A hybrid powertrain is provided that includes a driveline, a decoupled one-way clutch, and an internal combustion engine. The decoupled one-way clutch includes a selection element and a driver. The driver is configured to maintain the selection element in the coupled position upon power failure such that the decoupling one-way clutch is in a coupled state. Furthermore, when the driver is powered on, the selection element is kept in the decoupling position, so that the decoupling one-way clutch is in a decoupling state. The internal combustion engine is connected to the driveline via a decoupled one-way clutch. In this way, the hybrid power system is low in energy consumption.

Description

Technical Field

[0001] This application relates to the field of transmissions, and more particularly to a hybrid power system. Background Art

[0002] Chinese Patent Application CN102529672A discloses a hybrid power system using a selectable one-way clutch. An internal combustion engine and a first torque machine are connected to a second SOWC via a shaft element. The second SOWC is configured to connect the shaft element to a ring gear during startup and disconnect the shaft element from the ring gear during shutdown. However, there is still room for improvement in terms of energy consumption in the above hybrid power system. Summary of the Invention

[0003] This application provides a hybrid power system, including: a powertrain; a decoupling one-way clutch, which includes a selection element and a driver, the driver being configured to hold the selection element in a coupled position when powered off, so that the decoupling one-way clutch is in a coupled state, and hold the selection element in a decoupled position when powered on, so that the decoupling one-way clutch is in a decoupled state; and an internal combustion engine, which is connected to the powertrain via the decoupling one-way clutch.

[0004] In an alternative embodiment, the decoupling one-way clutch further includes a one-way clutch body, the one-way clutch body includes a first ring body, a second ring body and a torque element, the torque element is used to transmit torque between the first ring body and the second ring body, and the selection element is configured to engage with the first ring body in the coupled position and separate from the first ring body in the decoupled position.

[0005] In another alternative embodiment, the selection element is configured to be splined to the first ring body in the coupled position.

[0006] In another alternative embodiment, the torque element is a roller.

[0007] In another alternative embodiment, the decoupling one-way clutch further includes a one-way clutch body, the one-way clutch body includes a first ring body, a second ring body and a torque element, the torque element is used to transmit torque between the first ring body and the second ring body, and the selection element is configured to separate from the torque element in the coupled position and hold the torque element in a disengaged position in the decoupled position.

[0008] In another alternative embodiment, the driver includes an electromagnet, and the electromagnet can move the selection element from the coupled position to the decoupled position by magnetic force.

[0009] In another alternative embodiment, the driver includes a return spring that biases the selection element towards the coupling position, and the return spring is capable of moving the selection element from the decoupling position to the coupling position by elastic force.

[0010] In another alternative embodiment, the driver further includes a stabilizing spring that biases the selection element towards the decoupling position.

[0011] In another alternative embodiment, the internal combustion engine is connected to the powertrain via a single decoupling one-way clutch.

[0012] In another alternative embodiment, it further includes: a first motor connected between the internal combustion engine and the decoupling one-way clutch; a second motor connected to the decoupling one-way clutch via the powertrain; an inverter; and a battery, wherein the first motor, the second motor, and the battery are electrically connected to the inverter.

[0013] With the above technical solution, by configuring the decoupling one-way clutch in the coupled state when the driver is powered off and in the decoupled state when the driver is powered on, the driver is in the powered-off state in most working conditions and only needs to be powered on in a small part of the working conditions, so that the energy consumption of the decoupling one-way clutch and the hybrid system is small. Description of the Drawings

[0014] Figure 1 Shows a schematic diagram of a hybrid system according to an embodiment of the present application.

[0015] Figure 2 Shows Figure 1 a cross-sectional view of the decoupling one-way clutch of the hybrid system in

[0016] Explanation of Reference Numerals

[0017] 1 Powertrain;

[0018] 2 Decoupling one-way clutch; 21 One-way clutch body; 211 Inner ring; 212 Outer ring; 213 Roller; 214 Convex portion; 22 Synchronization ring; 22a Groove; 23 Driver; 231 Electromagnet; 232 Second return spring; 233 Stabilizing spring;

[0019] 3 Internal combustion engine;

[0020] 4 First motor;

[0021] 5 Second motor;

[0022] 6 Differential;

[0023] 7 Wheel;

[0024] 8 Inverter;

[0025] 9 Battery;

[0026] S1 First rotating shaft; S2 Second rotating shaft; S3 Third rotating shaft; S4 Fourth rotating shaft; S5 Fifth rotating shaft; S6 Sixth rotating shaft;

[0027] T1 First gear; T2 Second gear; T3 Third gear; T4 Fourth gear; T5 Fifth gear; T6 Sixth gear; T7 Seventh gear;

[0028] A Axial direction. Detailed implementation manners

[0029] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, rather than to exhaust all feasible ways of the present application, nor to limit the scope of the present application.

[0030] In the present application, unless otherwise specified, the "coupling state" refers to the state in which the decoupling one-way clutch has the ability to transmit torque unidirectionally, the "decoupling state" refers to the state in which the decoupling one-way clutch does not have the ability to transmit torque, and the "torque-resistant connection" refers to a connection that can transmit torque.

[0031] Figure 1 and Figure 2 shows a hybrid power system according to an embodiment of the present application, which can be, for example, a hybrid power system with a P1&P3 architecture.

[0032] Refer to Figure 1 , the hybrid power system mainly may include a powertrain 1, a decoupling one-way clutch 2 (DOWC, decoupling one-way clutch), an internal combustion engine 3, a first motor 4, a second motor 5, a differential 6, and wheels 7. The internal combustion engine 3 can be connected to the powertrain 1 via the first rotating shaft S1, the decoupling one-way clutch 2, and the second rotating shaft S2 in sequence. The first motor 3 can be connected to the first rotating shaft S1 via the third rotating shaft S3, the first gear T1, and the second gear T2 in sequence. The first gear T1 and the second gear T2 can mesh with each other. The first gear T1 can be torque-resistantly connected to the third rotating shaft S3, and the second gear T2 can be torque-resistantly connected to the first rotating shaft S1. The second motor 5 can be connected to the powertrain 1 via the fourth rotating shaft S4. Two wheels 7 can be respectively connected to the differential 6 via different fifth rotating shafts S5, and the differential 6 can be connected to the powertrain 1, for example, connected to the seventh gear T7. It can be understood that Figure 1 the structure of

[0033] The first motor 4, the second motor 5, and the battery 9 can be electrically connected to the inverter 8. The first motor 4 can be a commonly referred to P1 motor, and the second motor 5 can be a commonly referred to P3 motor. Here, the first motor 4 can be used but is not limited to generating electricity, and the second motor 5 can be used but is not limited to driving the vehicle.

[0034] The powertrain 1 can be a transmission or a part of a transmission. The powertrain 1 can include a third gear T3, a fourth gear T4, a fifth gear T5, a sixth gear T6, a seventh gear T7, and a sixth rotating shaft S6. The third gear T3 and the fourth gear T4 can be sequentially connected to the seventh gear T7 via the fifth gear T5, the sixth rotating shaft S6, and the sixth gear T6. The fifth gear T5 and the sixth gear T6 can be torsionally connected to the sixth rotating shaft S6. The third gear T3 can be torsionally connected to the second rotating shaft S2 and meshed with the fifth gear T5. The fourth gear T4 can be torsionally connected to the fourth rotating shaft S4 and meshed with the fifth gear T5. The seventh gear T7 meshes with the sixth gear T6.

[0035] Referring to Figure 2 , the decoupling one-way clutch 2 can include a one-way clutch body 21, a synchronizing ring 22 (an example of a selection element), and a driver 23.

[0036] The one-way clutch body 21 can include an inner ring 211 (an example of a first ring body), an outer ring 212 (an example of a second ring body), rollers 213, and a first return spring. The outer ring 212 can be sleeved on the inner ring 211, and the rollers 213 and the first return spring can be held between the inner ring 211 and the outer ring 212. The rollers 213 can switch between an engaged position and a disengaged position, and the first return spring can bias the rollers 213 toward the engaged position. When the rollers 213 are in the engaged position, the rollers 213 can transmit torque between the inner ring 211 and the outer ring 212, so that the inner ring 211 and the outer ring 212 can rotate unidirectionally and synchronously. When the rollers 213 are in the disengaged position, the rollers 213 no longer transmit torque between the inner ring 211 and the outer ring 212, so that the inner ring 211 and the outer ring 212 can rotate freely from each other, that is, the one-way clutch body 21 can be regarded as a bearing. In other words, in this embodiment, the one-way clutch body 21 is a commonly referred to roller type one-way clutch. The inner ring 211 can be rotatably sleeved on the first rotating shaft S1, for example, it can be mounted on the first rotating shaft S1 through a bearing or a bushing. The outer ring 212 can be torsionally connected to the second rotating shaft S2, for example, it can be spline-connected to the second rotating shaft S2.

[0037] The driver 23 may include an electromagnet 231, a second return spring 232, and a stabilizing spring 233. The synchronizing ring 22 may be made of a magnetically conductive material, and the annular electromagnet 231 may be sleeved on the synchronizing ring 22. The second return spring 232 may be disposed on one axial side of the synchronizing ring 22 ( Figure 2 the right side in), and bias the synchronizing ring 22 toward the other axial side ( Figure 2 the left side in). The stabilizing spring 233 may be disposed on the other axial side of the synchronizing ring 22 ( Figure 2 the left side in), and bias the synchronizing ring 22 toward one axial side ( Figure 2 the right side in). The elastic force provided by the second return spring 232 may always be greater than the elastic force provided by the stabilizing spring 233. The synchronizing ring 22, the second return spring 232, and the stabilizing spring 233 may be sleeved on the first rotating shaft S1 (see Figure 1 ), and disposed on one axial side of the inner ring 211 ( Figure 2 the right side in). The stabilizing spring 233 may be restricted between the inner ring 211 and the synchronizing ring 22. The synchronizing ring 22 may be splined to the first rotating shaft S1 and capable of sliding along the first rotating shaft S1.

[0038] The decoupling one-way clutch 2 may switch between a coupled state and a decoupled state. When the electromagnet 23 is de-energized, the second return spring 232 may hold the synchronizing ring 22 at a coupling position close to the inner ring 211 by elastic force. The synchronizing ring 22 at the coupling position may be splined to the inner ring 211, that is, engaged with the inner ring 211, so that the decoupling one-way clutch 2 is in the coupled state ( Figure 2 the state shown). In the coupled state, the torque of the first rotating shaft S1 can be sequentially transmitted to the second rotating shaft S2 via the synchronizing ring 22 and the one-way clutch body 21. When the electromagnet 23 is energized, the electromagnet 231 may hold the synchronizing ring 22 at a decoupling position away from the inner ring 211 by magnetic force. The synchronizing ring 22 at the decoupling position may be separated from the inner ring 211, so that the decoupling one-way clutch 2 is in the decoupled state. In the decoupled state, the torque of the first rotating shaft S1 can only be transmitted to the synchronizing ring 22, and no longer transmitted to the one-way clutch body 21 and the second rotating shaft S2. Here, "separation" does not mean that there is no contact between the inner ring 211 and the synchronizing ring 22, but means that the parts for torque transmission on the inner ring 211 and the synchronizing ring 22 no longer engage with each other. In some possible embodiments, in the decoupled state, the parts of the inner ring 211 and the synchronizing ring 22 that are irrelevant to torque transmission may still remain in contact. By changing the working state of the electromagnet 23, the synchronizing ring 22 can slide along the axial direction A to switch between the coupling position and the decoupling position.

[0039] The inner ring 211 may be engaged with the synchronizing ring 22 through the convex portion 214. The annular convex portion 214 may be disposed at one axial end of the inner ring 211 ( Figure 2(at the right end in...), an external spline may be provided on the outer periphery of the convex portion 214. At the other axial end of the synchronizer ring 22 ( Figure 2 at the left end in...), an annular groove 22a may be provided, and on the wall portion on the radially outer side of the groove 22a ( Figure 2 on the upper wall portion in...), an internal spline may be provided. When the synchronizer ring 22 is in the coupled position, the convex portion 214 may be inserted into the groove 22a and abutted against the bottom of the groove 22a ( Figure 2 on the right wall portion in...). The external spline of the convex portion 214 and the internal spline of the groove 22a may be engaged with each other, so that the torque of the synchronizer ring 22 can be transmitted to the inner ring 211.

[0040] Referring to Table 1, the hybrid power system may operate in the first mode, or the parallel mode. In the first mode, the decoupling one-way clutch 2 may be set in the coupled state. The first rotating shaft S1 and the second rotating shaft S2 may rotate in the forward direction (the rotation direction when the vehicle is moving forward), and the rotational speed of the first rotating shaft S1 may be equal to the rotational speed of the second rotating shaft S2, so that the roller 213 is in the engaged position. Under the direct drive condition of the internal combustion engine, the wheel 7 may be driven only by the internal combustion engine 3. Under the load point adjustment condition, by adjusting the power generation amount of the first motor 4, the internal combustion engine 3 may operate in a relatively high-efficiency medium-high load range. For example, the rotational speed of the internal combustion engine 3 may be maintained at 2000 rpm to 4000 rpm. Under the parallel assist condition, the internal combustion engine 3 and the second motor 5 may jointly drive the wheel 7.

[0041] Table 1

[0042] Operating condition Internal combustion engine 3 First electric motor 4 Second electric motor 5 Decoupling one-way clutch 2 Direct drive of internal combustion engine On Off Off Coupled state (engagement position) Load point adjustment On On Off Coupled state (engagement position) Parallel boost On Off On Coupled state (engagement position)

[0043] Referring to Table 2, the hybrid power system may operate in the second mode, or the series mode. In the second mode, the decoupling one-way clutch 2 may be set in the coupled state. The first rotating shaft S1 and the second rotating shaft S2 may rotate in the forward direction, and the rotational speed of the first rotating shaft S1 may be less than the rotational speed of the second rotating shaft S2, so that the roller 213 is in the disengaged position. Under all working conditions in Table 2, the wheel 7 is driven only by the second motor 5. Among them, under the range extender driving condition, the internal combustion engine 3 may drive the first motor 4 to generate electric energy.

[0044] Table 2

[0045] Operating condition Internal combustion engine 3 First electric motor 4 Second electric motor 5 Decoupling one-way clutch 2 Range-extended driving On On On Coupled state (disengagement position) Starting Off Off On Coupled state (disengagement position) Electric drive Off Off On Coupled state (disengagement position) Energy recovery Off Off On Coupled state (disengagement position)

[0046] Referring to Table 3, the hybrid system can operate in the third mode. In the third mode, the decoupling one-way clutch 2 can be set to the decoupled state. Under the idle power generation condition, the internal combustion engine 3 can only drive the first motor 4, and the torque will not be transmitted to the drive wheels 7, enabling the vehicle to maintain the idle state while charging. Under the reverse gear condition, the second rotating shaft S2 rotates in the reverse direction (the rotating direction when the vehicle reverses), and the torque generated by the second motor 5 will not be transmitted in the reverse direction to the first rotating shaft S1. In other words, in this mode, the first rotating shaft S1 and the second rotating shaft S2 are separated by the decoupling one-way clutch 2, so that the first rotating shaft S1 and the second rotating shaft S2 will not affect each other due to the rotating direction and speed.

[0047] Table 3

[0048] Operating condition Internal combustion engine 3 First electric motor 4 Second electric motor 5 Decoupling one-way clutch 2 Idle power generation On On Off Decoupled state Reverse gear Off Off On Decoupled state

[0049] The present application has at least the following advantages.

[0050] (i) By configuring the decoupling one-way clutch 2 to the coupled state when the driver 23 is powered off, and configuring the decoupling one-way clutch 2 to the decoupled state when the driver 23 is powered on, the driver 23 is powered off in most working conditions and only needs to be powered on in a small part of the working conditions, so that the energy consumption of the decoupling one-way clutch 2 and the hybrid system is small.

[0051] (ii) Compared with the prior art, by using the roller 213 as the torque element, that is, using the roller type one-way clutch as the one-way clutch body 21, the impact formed by the roller 213 is small, so that the decoupling one-way clutch 2 can transmit torque more smoothly.

[0052] (iii) By setting the stabilizing spring 233, the stabilizing spring 233 can provide damping during the process of the synchronizing ring 22 moving towards the coupling position, thereby reducing the impact of the synchronizing ring 22 on the inner ring 211. In addition, when the synchronizing ring 22 is in the decoupled position, the second return spring 232 and the stabilizing spring 233 can bias the synchronizing ring 22 in opposite directions, which is beneficial to the synchronizing ring 22 to stably maintain in the decoupled position.

[0053] It should be understood that the above embodiments are merely exemplary and are not used to limit the present application. Those skilled in the art can make various modifications and changes to the above embodiments under the teaching of the present application without departing from the scope of the present application.

[0054] (i) The one-way clutch body is not limited to a roller type one-way clutch. For example, it can be a sprag type one-way clutch, a diode type one-way clutch, a rocker type one-way clutch, or a spiral type one-way clutch.

[0055] (ii) The selecting element is not limited to engaging with the first annular body. As an example, the selecting element can be switched between a coupling position and a decoupling position by axial movement. When the selecting element is in the coupling position, the selecting element can be separated from the torque element so that the torque element can be switched between an engaging position and a disengaging position. When the selecting element is in the decoupling position, the selecting element can bias and hold the torque element in the disengaging position.

[0056] The inner ring 211 is not limited to being rotatably connected to the first rotating shaft S1, and the selecting element is not limited to being torsionally resistant to the first rotating shaft S1. For example, the inner ring 211 can be torsionally resistant to the first rotating shaft S1, and the selecting element can be rotatably connected to the first rotating shaft S1.

Claims

1. A hybrid power system, characterized in that, Comprising: A powertrain (1); A decoupling one-way clutch, which includes a selection element and a driver, the driver being configured to hold the selection element in a coupled position when powered off, such that the decoupling one-way clutch is in a coupled state, and to hold the selection element in a decoupled position when powered on, such that the decoupling one-way clutch is in a decoupled state; And An internal combustion engine (3), which is connected to the powertrain (1) via the decoupling one-way clutch.

2. The hybrid system according to claim 1, wherein The decoupling one-way clutch (2) further includes a one-way clutch body (21), the one-way clutch body (21) including a first ring body, a second ring body, and a torque element for transmitting torque between the first ring body and the second ring body, the selection element (22) being configured to engage with the first ring body in the coupled position and to disengage from the first ring body in the decoupled position.

3. The hybrid system according to claim 2, characterized in that, The selection element (22) is configured to be splined to the first ring body in the coupled position.

4. The hybrid system according to claim 2, wherein The torque element is a roller (213).

5. The hybrid system according to claim 1, wherein The decoupling one-way clutch further includes a one-way clutch body, the one-way clutch body including a first ring body, a second ring body, and a torque element for transmitting torque between the first ring body and the second ring body, the selection element being configured to disengage from the torque element in the coupled position and to hold the torque element in a disengaged position in the decoupled position.

6. The hybrid system according to any one of claims 1 to 5, characterized in that, The driver (23) includes an electromagnet (231), the electromagnet (231) being capable of moving the selection element (22) from the coupled position to the decoupled position by magnetic force.

7. The hybrid system according to any one of claims 1 to 5, characterized in that, The driver (23) includes a return spring (232) that biases the selection element (22) toward the coupled position, the return spring (232) being capable of moving the selection element (22) from the decoupled position to the coupled position by elastic force.

8. The hybrid system according to any one of claims 1 to 5, characterized in that The driver (23) further includes a stabilizing spring (233) that biases the selection element (22) toward the decoupled position.

9. The hybrid system according to any one of claims 1 to 5, characterized in that, The internal combustion engine (3) is connected to the powertrain (1) via a single said decoupling one-way clutch.

10. The hybrid system according to any one of claims 1 to 5, characterized in that, Further comprising: A first electric motor (4), which is connected between the internal combustion engine (3) and the decoupling one-way clutch (2); A second electric motor (5), which is connected to the decoupling one-way clutch (2) via the powertrain (1); An inverter (8); and A battery (9), wherein The first electric motor (4), the second electric motor (5), and the battery (9) are electrically connected to the inverter (8).

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