Hybrid power system configuration and automobile driving method using same

Abstract

The invention discloses a hybrid power system configuration and an automobile driving method using the same, the hybrid power system configuration comprises a power input shaft, a power transmission intermediate shaft and a power output shaft which are arranged in sequence, and the power input shaft is connected with an output shaft of an engine through a spline; the hybrid power system further comprises a wet-type double clutch, a generator, an electromagnetic brake, a compound planet row, a driving motor and a single planet row, the single planet row is provided with a planet carrier, a sun gear and a gear ring, the gear ring of the single planet row is fixed, the sun gear of the single planet row is connected with the driving motor, and the planet carrier of the single planet row is connected with the power output shaft. The method has the beneficial effects that by additionally arranging the wet-type double clutches, zero-speed starting of the engine is achieved, and starting smoothness is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hybrid vehicles, in particular to a hybrid power system configuration and a vehicle driving method using the same. BACKGROUND

[0002] A hybrid vehicle, also known as a composite power vehicle, is a vehicle equipped with two or more power sources: a battery, a fuel cell, a solar cell, and an engine generator set of an internal combustion engine vehicle. Currently, a composite power vehicle generally refers to an internal combustion engine vehicle with an engine generator and a battery.

[0003] The existing composite power vehicle has the following defects in use: 1. The engine-driven vehicle cannot start at zero kilometers per hour; 2. The existing technology architecture has a fixed connection between the generator and the engine, and the planet carrier (between the engine and the generator) has a fixed gear ring, which cannot realize dual-motor driving; 3. There is a lack of large-torque sliding friction components such as a hydraulic torque converter and a starting clutch to support the vehicle's zero-kilometer starting, and the engine cannot be involved below 10Km; long-term low-speed heavy load frequent starting can easily cause friction plate ablation and other faults.

[0004] The patent with the application number "CN202310944953.2" discloses a method for driving a power system of a hybrid vehicle and a hybrid vehicle. However, the main problem it solves is to improve the accuracy and reliability of the driving power information calculation results of the hybrid vehicle, and to solve the problem that the existing technology does not pay attention to the influence of the changes of various driving parameters during vehicle operation on the driving power of the hybrid power system. SUMMARY

[0005] The present application aims to provide a hybrid power system configuration and a vehicle driving method using the same, which can solve the problem of engine zero-kilometer starting.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: A hybrid power system configuration, comprising a power input shaft, a power transmission intermediate shaft and a power output shaft arranged in sequence, the power input shaft being connected to the output shaft of the engine through a spline, further comprising a wet-type double clutch, a generator, an electromagnetic brake, a composite planetary gear set, a drive motor and a single planetary gear set, the single planetary gear set having a planet carrier, a sun gear and a gear ring, the gear ring of the single planetary gear set being fixed, the sun gear of the single planetary gear set being connected to the drive motor, and the planet carrier of the single planetary gear set being connected to the power output shaft.

[0007] Preferably, the wet double clutch comprises a first clutch and a second clutch; the electromagnetic brake comprises a first brake and a second brake; the compound planetary gear set comprises a first planetary gear set and a second planetary gear set.

[0008] Preferably, the first clutch and the second clutch each have a driven end and a driving end that can be connected to drive each other; the first planetary gear set and the second planetary gear set each have a carrier, a sun gear and a ring gear; The driven end of the first clutch is connected to the sun gear of the second planetary gear set through a power transmission intermediate shaft, and the driving end of the first clutch is connected to the power input shaft; The driven end of the second clutch is connected to the carrier of the first planetary gear set, and the driving end of the second clutch is connected to the power input shaft.

[0009] Preferably, the ring gear of the first planetary gear set is connected to the power output shaft, the sun gear of the first planetary gear set is connected to the output shaft of the generator through a spline, and the carrier of the first planetary gear set is connected to the ring gear of the second planetary gear set; The carrier of the second planetary gear set is connected to the power output shaft.

[0010] Preferably, the application also discloses an automobile driving method based on the foregoing hybrid power system configuration, wherein the zero kilometer vehicle speed starting process comprises the following steps: A1, the first clutch is combined so that the power input shaft and the power transmission intermediate shaft are connected, and the ring gear of the first planetary gear set is locked with the carrier of the second planetary gear set; A2, the power flow of the generator passes through the carrier of the first planetary gear set, the ring gear of the second planetary gear set, the sun gear of the second planetary gear set, and then is transmitted to the first clutch, thereby starting the engine; A3, the engine is started at zero kilometer vehicle speed.

[0011] Preferably, the application also discloses an automobile driving method based on the foregoing hybrid power system configuration, wherein the zero kilometer vehicle speed starting process can further comprise the following steps: B1, the second clutch is combined so that the power input shaft and the power transmission intermediate shaft are connected, and the ring gear of the first planetary gear set is locked with the carrier of the second planetary gear set; B2, the power flow of the generator is transmitted to the second clutch from the carrier of the first planetary gear set, thereby starting the engine; B3, the engine is started at zero kilometer vehicle speed.

[0012] Preferably, the application also discloses an automobile driving method based on the foregoing hybrid power system configuration, wherein the double motor driving comprises the following steps: C1. The first brake engages to lock the planetary carrier of the first planetary gear set. The generator's power is input from the sun gear of the first planetary gear set, output from the ring gear of the first planetary gear set, and finally output to the wheel end, realizing generator drive. C2. The power of the driving motor is input from the sun gear of the single planetary gear set. The ring gear of the single planetary gear set is fixed, and the power is output from the planet carrier of the single planetary gear set to the wheel end. C3, the generator and the drive motor distribute the torque according to the control strategy to achieve dual-motor joint drive.

[0013] The beneficial effects of the present invention are: 1. By adding a wet dual clutch, the engine can be started at zero speed and the starting smoothness is improved.

[0014] 2. It can realize simultaneous driving of dual motors in pure electric mode, significantly improving the starting and driving dynamics of pure electric mode.

[0015] 3. Solved the problems of motor high temperature and clutch burning caused by frequent starting at low speed and high load. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the present invention.

[0017] The accompanying drawings are for illustrative purposes only and are not to be construed as limitations on this patent. To better illustrate this embodiment, some components of the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent the actual dimensions of the product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted from the accompanying drawings. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Example 1 like Figure 1 As shown, a hybrid power system configuration includes a power input shaft 1, a power transmission intermediate shaft 11 and a power output shaft 12 arranged in sequence. The power input shaft 1 is connected to the output shaft of the engine 2 through a spline. It also includes a wet dual clutch 4, a generator 5, an electromagnetic brake 6, a compound planetary gear 7, a drive motor 8 and a single planetary gear 9.

[0020] The wet dual clutch 4 includes a first clutch 41 and a second clutch 42 ; the electromagnetic brake 6 includes a first brake 61 and a second brake 62 ; and the compound planetary gear 7 includes a first planetary gear 71 and a second planetary gear 72 .

[0021] The electromagnetic brake 62 is used to brake the sun gear of the first planetary gear set 71 ; and the first brake 61 is used to brake the planet carrier of the first planetary gear set 71 .

[0022] The single planetary gear set 9, the first planetary gear set 71 and the second planetary gear set 72 all have a planet carrier, a sun gear and a ring gear. In the same planetary gear set, one of the planet carrier, the sun gear and the ring gear is fixed, the second one rotates under the drive of the third one, which is a conventional technology in the mechanical field, and will not be described in detail in the present embodiment.

[0023] The first clutch 41 and the second clutch 42 both have a driven end and a driving end which can be connected to drive each other.

[0024] The driven end of the first clutch 41 is connected with the sun gear of the second planetary gear set 72 through the power transmission intermediate shaft 11, and the driving end of the first clutch 41 is connected with the power input shaft 1 through the spline.

[0025] The driven end of the second clutch 42 is connected with the planet carrier of the first planetary gear set 71 through the spline, and the driving end of the second clutch 42 is connected with the power input shaft 1 through the spline.

[0026] The ring gear of the first planetary gear set 71 is connected with the power output shaft 12, the sun gear of the first planetary gear set 71 is connected with the output shaft of the generator 5 through the spline, and the planet carrier of the first planetary gear set 71 is connected with the ring gear of the second planetary gear set 72.

[0027] The planet carrier of the second planetary gear set 72 is connected with the power output shaft 12.

[0028] The driving motor 8 is sleeved on the power output shaft 12, is connected with the sun gear of the single planetary gear set 9, the ring gear of the single planetary gear set 9 is fixed, and the planet carrier of the single planetary gear set 9 is connected with the power output shaft 12.

[0029] Embodiment two The present embodiment provides a vehicle driving method based on the hybrid power system configuration in embodiment one, wherein the zero kilometer vehicle speed starting process comprises the following steps: A1, the first clutch 41 is combined (the clutch friction plate is combined under the action of oil pressure), so that the power input shaft 1 and the power transmission intermediate shaft 11 are connected. At the same time, the ring gear of the first planetary gear set 71 is locked with the planet carrier of the second planetary gear set 72, that is, the ring gear of the first planetary gear set 71 is connected with the planet carrier of the second planetary gear set 72 and the wheel end is locked by the electronic hand brake or the P gear. A2, the generator 5 is started, the sun gear of the first planetary gear set 71 rotates, because its ring gear is locked, so the planet carrier of the first planetary gear set 71 rotates, driving the ring gear of the second planetary gear set 72 to rotate, because its planet carrier is locked, so the sun gear of the second planetary gear set 72 rotates, and is transmitted to the driven end of the first clutch 41, the driven end drives the driving end, and then drives the engine 2 through the power input shaft 1 to start.

[0030] A3, the engine zero kilometer vehicle speed starting is realized.

[0031] Through the above steps, the zero kilometer vehicle speed starting of the engine driving the whole vehicle is realized; moreover, through the setting of the wet type double clutch 4, when the zero kilometer vehicle speed starting is realized, the clutch is first combined, and then the generator 5 is used to start the engine 2, so that the excessive sliding friction work of the clutch is avoided, and the friction plate of the clutch is not ablated.

[0032] Example Three The application further provides an automobile driving method based on the hybrid power system configuration, wherein the zero kilometer vehicle speed starting process can further comprise the following steps: B1, the second clutch 42 is combined, so that the power input shaft 1 and the power transmission intermediate shaft 11 are connected. At the same time, the ring gear of the first planetary gear set 71 is locked with the carrier of the second planetary gear set 72, that is, the ring gear of the first planetary gear set 71 and the carrier of the second planetary gear set 72 are connected with the automobile wheel end, and the wheel end is locked by the electronic hand brake or the P gear; B2, the generator 5 is started, the sun gear of the first planetary gear set 71 rotates, and because the ring gear is locked, the carrier of the first planetary gear set 71 rotates, drives the driven end of the second clutch 42, drives the driving end, and then drives the engine 2 through the power input shaft 1 to start.

[0033] Compared with the above step A2, the ring gear of the second planetary gear set 72 also rotates to drive the sun gear of the second planetary gear set 72 to rotate, but because the first clutch 41 is not combined, the power cannot be transmitted through the first clutch 41.

[0034] Moreover, in the above step A2, because the second clutch 42 is not combined, the driven end of the second clutch 42 cannot drive the driving end to transmit the power.

[0035] B3, the engine zero kilometer vehicle speed starting is realized.

[0036] Through the above steps, the zero kilometer vehicle speed starting of the engine driving the whole vehicle is realized; moreover, through the setting of the wet type double clutch 4, when the zero kilometer vehicle speed starting is realized, the clutch is first combined, and then the generator 5 is used to start the engine 2, so that the excessive sliding friction work of the clutch is avoided, and the friction plate of the clutch is not ablated.

[0037] Both the example and the example two can realize the zero kilometer vehicle speed starting, and in the actual driving process, it is defined by the whole vehicle software control strategy that the first clutch 41 or the second clutch 42 can be used, and how the control strategy is formulated. For example, after the driver steps on the accelerator at the traffic light, the zero kilometer vehicle speed starting is realized according to the control strategy in the vehicle.

[0038] Example Four The application also provides an automobile driving method based on the hybrid power system configuration, wherein the double-motor driving comprises the following steps: C1, the first brake 61 locks the planet carrier of the first planetary gear set 71, the generator 5 is started, the sun gear of the first planetary gear set 71 rotates, the ring gear of the first planetary gear set 71 rotates due to the lock of the planet carrier, and the power output shaft 12 rotates to drive the wheel end to realize the driving of the generator 5.

[0039] C2, the driving motor 8 is started, the sun gear of the single planetary gear set 9 rotates, the ring gear of the single planetary gear set 9 is fixed, and thus the planet carrier of the single planetary gear set 9 rotates to output power to the wheel end to realize the driving of the driving motor 8.

[0040] C3, the generator 5 and the driving motor 8 realize the double-motor common driving according to the torque allocated by the control strategy.

[0041] Through the above steps, the double-motor driving is realized. In the prior art, the generator is fixedly connected with the engine, and the engine is not allowed to work in the pure electric mode, so the generator cannot drive in the pure electric mode, and the double-motor driving cannot be realized. In the scheme of the application, the clutch can form the connection relationship between the generator and the engine. When the clutch is not combined, the generator and the engine do not form the connection relationship. Only when the clutch works, the generator forms the connection relationship with the engine.

[0042] The above embodiments are not limited in shape, material, structure, etc. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the application are within the protection scope of the technical scheme of the application.

[0043] In the description of the application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and thus cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus cannot be understood as limiting the protection scope of the application.

[0044] If the terms "first", "second", etc. are used to limit the parts in the text, those skilled in the art should know that the use of "first", "second" is only for the convenience of describing the application and simplifying the description, and the above terms have no special meaning unless otherwise stated.

[0045] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some of the technical features can be replaced by equivalents, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hybrid power system configuration comprising a power input shaft, a power transmission intermediate shaft, and a power output shaft arranged in sequence, wherein the power input shaft is spline-connected to the output shaft of the engine, and characterized in that: It also includes a wet dual clutch, a generator, an electromagnetic brake, a compound planetary gear, a drive motor and a single planetary gear. The single planetary gear has a planetary carrier, a sun gear and a ring gear. The ring gear of the single planetary gear is fixed, the sun gear of the single planetary gear is connected to the drive motor, and the planetary carrier of the single planetary gear is connected to the power output shaft.

2. A hybrid power system configuration according to claim 1, characterized in that: The wet dual clutch includes a first clutch and a second clutch; the electromagnetic brake includes a first brake and a second brake; and the compound planetary gear includes a first planetary gear and a second planetary gear.

3. A hybrid power system configuration according to claim 2, characterized in that: The first clutch and the second clutch each have a driven end and a driving end that can be connected to each other for driving; the first planetary gear and the second planetary gear each have a planet carrier, a sun gear and a ring gear; The driven end of the first clutch is connected to the sun gear of the second planetary gear set via a power transmission intermediate shaft, and the active end of the first clutch is connected to the power input shaft; The driven end of the second clutch is connected to the planet carrier of the first planetary gear, and the active end of the second clutch is connected to the power input shaft.

4. A hybrid power system configuration according to claim 3, characterized in that: The ring gear of the first planetary gear set is connected to the power output shaft, the sun gear of the first planetary gear set is connected to the output shaft of the generator through a spline, and the planet carrier of the first planetary gear set is connected to the ring gear of the second planetary gear set; The planet carrier of the second planetary gear is connected to the power output shaft.

5. A vehicle driving method, based on the hybrid power system configuration according to claim 4, characterized in that: The zero-kilometer speed start process includes the following steps: A1. The first clutch is engaged, connecting the power input shaft and the power transmission intermediate shaft. The ring gear of the first planetary gear set is locked with the planet carrier of the second planetary gear set. A2. The generator's power flows from the planetary carrier of the first planetary gear set through the ring gear of the second planetary gear set to the sun gear of the second planetary gear set, and then to the first clutch, thereby starting the engine. A3. Realize engine starting at zero kilometer speed.

6. A vehicle driving method, based on the hybrid power system configuration according to claim 4, characterized in that: The zero-kilometer speed start process may also include the following steps: B1. The second clutch is engaged to connect the power input shaft and the power transmission intermediate shaft, and the ring gear of the first planetary gear set and the planet carrier of the second planetary gear set are locked; B2. The power flow of the generator is transmitted from the planetary carrier of the first planetary gear to the second clutch, thereby starting the engine; B3. Realize engine starting at zero kilometer speed.

7. A vehicle driving method, based on the hybrid power system configuration according to claim 4, characterized in that: The dual-motor drive includes the following steps: C1. The first brake engages to lock the planetary carrier of the first planetary gear set. The generator's power is input from the sun gear of the first planetary gear set, output from the ring gear of the first planetary gear set, and finally output to the wheel end, realizing generator drive. C2. The power of the driving motor is input from the sun gear of the single planetary gear set. The ring gear of the single planetary gear set is fixed, and the power is output from the planet carrier of the single planetary gear set to the wheel end. C3, the generator and the drive motor distribute the torque according to the control strategy to achieve dual-motor joint drive.

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