Hybrid power driving system, motorcycle and driving method

Abstract

The invention discloses a hybrid power system which comprises a battery, a first motor, a second motor, an engine and a clutch, the battery is connected with the first motor and the second motor, the engine provides power for a whole vehicle through combination of the clutch, and the second motor provides power for the whole vehicle; when the vehicle is accelerated urgently, the clutch is in a combined state, the engine and the second motor jointly provide power for the whole vehicle, and the first motor generates power when the SOC value of the battery is low. According to the invention, when the SOC value of the battery is relatively low, the first motor generates electricity, and the battery stores electricity, so that the normal work of the second motor can be ensured, the power required by the rapid acceleration of the vehicle can be provided, the rapid acceleration of the vehicle can be smoothly completed, and the higher power and enough cruising ability of the vehicle are ensured. The invention further provides a motorcycle and a driving method.

Description

Technical Field

[0001] The present invention relates to a power drive system, and particularly to a hybrid drive system, a motorcycle and a drive method. Background Art

[0002] With the increasing emphasis on new energy, hybrid systems have been fully developed in the automotive industry. Representative brands at home and abroad include Honda, Toyota, BYD, etc. The hybrid vehicles they launched have received wide acclaim from users and tend to replace traditional fuel vehicles. Influenced by the development of the automotive industry, the motorcycle industry has also started to develop towards hybrid systems. Representative brands at home and abroad include Honda, BMW, Dayang, etc.; The hybrid system uses electricity to replace part of the engine fuel power, which can avoid the reliability problems of overly large batteries and insufficient battery life compared to pure electric systems, and can reduce fuel consumption, save energy and reduce emissions compared to pure fuel systems.

[0003] Chinese Patent Document CN110027400B discloses a dual-motor hybrid system, including an engine (1), a clutch (2), a first motor (3), and a second motor (4). Among them: the clutch (2) includes a driving hub (201) and a driven hub (202). The driving hub (201) is fixedly connected to the crankshaft of the engine (1), and the driven hub (202) is fixedly connected to the first end of the driving shaft (17); the first motor (3) includes a stator (301) and a rotor (302). The rotor (302) is fixedly connected to the driven hub (202), so that the power output by the engine (1) and the first motor (3) can utilize the state change of the clutch (2) to simultaneously output to the transmission or independently output to the transmission. The first motor (3) and the second motor (4) are provided, so that the hybrid system can utilize the coordinated work between the two motors and the internal combustion engine to adapt to complex driving conditions and improve fuel economy.

[0004] In this prior art, the hybrid system is provided with multiple operating modes, which can adapt to different driving conditions and improve fuel economy. However, in this prior art, when the vehicle needs to accelerate urgently, there is a problem that the power is insufficient, resulting in the vehicle being unable to complete the acceleration smoothly. Summary of the Invention

[0005] In order to solve the problem that the power is insufficient when the vehicle accelerates urgently in the hybrid system of the prior art, the present invention provides a hybrid drive system, including a battery, a first motor, a second motor, an engine and a clutch. The battery is connected to the first motor and the second motor. The engine provides power to the whole vehicle through the engagement of the clutch, and the second motor provides power to the whole vehicle; When the vehicle enters a rapid acceleration, the clutch is in an engaged state, the engine and the second motor jointly provide power for the whole vehicle, and the first motor generates electricity when the SOC value of the battery is low.

[0006] Compared with the prior art, in the present invention, when the vehicle enters a rapid acceleration, the engine and the second motor jointly provide the power for the whole vehicle, which can ensure the power required during the rapid acceleration of the vehicle. However, considering that there is still a situation of insufficient power during rapid acceleration, it may be because the battery is low and unable to drive the second motor to work. Therefore, in the present invention, when the SOC value of the battery is relatively low, the first motor generates electricity, and thus the battery stores electricity, which can ensure the normal operation of the second motor, thereby providing the power required during the rapid acceleration of the vehicle, and being able to ensure that the vehicle completes the rapid acceleration smoothly, ensuring higher power and sufficient endurance of the vehicle.

[0007] Preferably, the output end of the second motor outputs power through a single-stage reduction structure. In this solution, the selection of the single-stage reduction structure has less loss of function compared with multi-stage reduction.

[0008] Preferably, the first motor is located on the left crank of the engine, and the clutch is connected to the engine crankshaft through a gear structure. In this solution, the selection of the positions of the first motor and the clutch makes the hybrid drive system structure compact.

[0009] Preferably, the gear structure includes a driving gear and a driven gear that mesh with each other. The driving gear is installed on the crankshaft of the engine, and the driven gear meshes with the clutch.

[0010] Preferably, the clutch transmits the power output outward through a transmission shaft, and the engine and the clutch output power through a single-stage reduction structure. In this solution, the selection of the single-stage reduction structure has less loss of function compared with multi-stage reduction.

[0011] Preferably, the motor shaft of the second motor is connected to the transmission shaft.

[0012] In a second aspect, the present invention also provides a motorcycle, including wheels, and further including the hybrid drive system as described in any one of the above. The motor shaft of the second motor is connected to the wheels through a sprocket structure.

[0013] In a third aspect, the present invention also provides a driving method for a motorcycle, adopting the hybrid drive system as described in any one of the above, having six working modes, including the following steps: When the vehicle starts and is at a low speed, the pure electric mode is adopted: the engine and the first motor do not work, the clutch is in a disengaged state, and the second motor provides the power for the whole vehicle; in the pure electric mode, the power transmission direction is: second motor - sprocket structure - wheels; When the vehicle is stable and transitions to the series mode: the engine works, the first motor generates electricity, the clutch is in a disengaged state, and the second motor provides the power for the whole vehicle; in the series mode, the power transmission direction is: second motor - sprocket structure - wheels; When the vehicle enters medium and high speeds, it transitions to the pure fuel mode: The engine operates, the first motor does not operate, the clutch is engaged, the second motor does not operate. In the pure fuel mode, the power transmission direction is: engine - gear structure - transmission shaft - sprocket structure - wheels; When the vehicle enters rapid acceleration, it transitions to the parallel mode: The engine provides power for the whole vehicle, the first motor generates electricity when the battery SOC value is low, the clutch is engaged, the second motor provides power for the whole vehicle. In the parallel mode, the power transmission direction is: engine - gear structure - transmission shaft - power coupling of the output shaft of the second motor - sprocket structure - wheels; When the battery has low power, it enters the parking power generation mode: The engine operates, the first motor generates electricity, the clutch is disengaged, and the second motor does not operate; When the vehicle brakes or decelerates, it transitions to the energy recovery mode: The clutch is disengaged, and the second motor generates electricity to recover the power during braking or deceleration at the wheels.

[0014] The present invention has the following beneficial effects: In the present invention, when starting and at low speeds, the whole vehicle is driven by the second motor, avoiding the high fuel consumption area of the engine. When the battery power of the whole vehicle is insufficient, the engine can drive the first motor to generate electricity. At this time, the engine is decoupled from the vehicle speed, and the engine can stably and continuously operate in the high-efficiency range. When the vehicle load matches the high-efficiency point of the engine, such as at medium and high speeds, the engine can directly intervene in the whole vehicle drive through the control of the clutch, combined with an efficient transmission structure, effectively reducing the fuel consumption and emissions of the whole vehicle. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the hybrid drive system in the embodiments of the hybrid drive system, motorcycle and drive method of the present invention. Detailed Embodiments

[0016] The following is a further detailed description through specific embodiments: 1. Definition Decoupling: Making the engine speed and vehicle speed no longer have a coupling relationship.

[0017] 2. The reference numerals in the drawings of the specification include: engine 1, crankshaft 2, first motor 3, second motor 4, motor shaft 5, driving sprocket 6, chain 7, driven sprocket 8, driving gear 9, driven gear 10, clutch 11, transmission shaft 12, wheels 13.

[0018] The embodiment is basically as shown in the attached Figure 1 The hybrid drive system includes a battery, a first motor 3, a second motor 4, an engine 1 and a clutch 11.

[0019] The first motor 3 is located on the left crank of the engine 1 and is used for power generation and starting and stopping of the engine 1; The second motor 4 is located on the left side of the driven gear 10 and cooperates with the transmission shaft 12 to provide power for the whole vehicle or perform energy recovery work. The output end of the second motor 4 outputs power through a primary reduction structure; The engine 1 provides power generation power for the first motor 3 or outputs power to the transmission shaft 12 through the engagement of the clutch 11, thereby driving the whole vehicle to run; The driving gear 9 is installed on the right crank of the crankshaft 2 of the engine 1 and meshes with the driven gear 10, and the driven gear 10 is connected to the motor clutch 11; The clutch 11 is connected to the crankshaft 2 of the engine 1 through a gear structure and transmits power output outward through the transmission shaft 12. Specifically, the gear structure includes the driving gear 9 and the driven gear 10 that mesh with each other. The clutch 11 is located on the right side of the driven gear 10, and its power output end cooperates with the transmission shaft 12 to control the engagement and separation of the driven gear 10 and the output shaft; The second motor 4 is installed on the engine 1 housing. The motor shaft 5 of the second motor 4 is connected to the transmission shaft 12, and the output end of the second motor 4 outputs power through a primary reduction structure. Specifically, the primary reduction structure connected to the second motor 4 includes a driving sprocket 6, a chain 7, and a driven sprocket 8. One end of the motor shaft 5 is connected to the transmission shaft 12, and the output shaft at the other end is installed with the driving sprocket 6, which is linked to the driven sprocket 8 through the chain 7, and the driven sprocket 8 is connected to the wheel 13.

[0020] In this embodiment, a motorcycle is also disclosed, which includes a wheel 13 and also includes the hybrid drive system as described in any one of the above. The motor shaft 5 of the second motor 4 is connected to the wheel 13 through a sprocket structure.

[0021] A driving method of a motorcycle, using the hybrid drive system as described in any one of the above, has six working modes, including the following steps: When starting and running at low speed of the vehicle, the pure electric mode is adopted: the engine 1 and the first motor 3 do not work, the clutch 11 is in a disengaged state, and the second motor 4 provides power for the whole vehicle; in the pure electric mode, the power transmission direction is: the second motor 4 - the driving sprocket 6 - the chain 7 - the driven sprocket 8 - the wheel 13; When the vehicle is stable, it transitions to the series mode: the engine 1 works, the first motor 3 generates electricity, the clutch 11 is in a disengaged state, and the second motor 4 provides power for the whole vehicle; in the series mode, the power transmission direction is: the second motor 4 - the driving sprocket 6 - the chain 7 - the driven sprocket 8 - the wheel 13; When the vehicle enters medium and high speeds, it transitions to the pure fuel mode: The engine 1 operates, the first motor 3 does not operate, the clutch 11 is in the engaged state, the second motor 4 does not operate. In the pure fuel mode, the power transmission direction is: engine 1 - driving gear 9 - driven gear 10 - transmission shaft 12 - driving sprocket 6 - chain 7 - driven sprocket 8 - wheel 13; When the vehicle enters rapid acceleration, it transitions to the parallel mode: The engine 1 provides power for the whole vehicle. The first motor 3 generates electricity when the battery SOC value is low. The clutch 11 is in the engaged state. The second motor 4 provides power for the whole vehicle. In the parallel mode, the power transmission direction is: engine 1 - driving gear 9 - driven gear 10 - transmission shaft 12 - power coupling of the output shaft of the second motor 4 - driving sprocket 6 - chain 7 - driven sprocket 8 - wheel 13; When the battery has low power, it enters the parking power generation mode: The engine 1 operates, the first motor 3 generates electricity, the clutch 11 is in the disengaged state, and the second motor 4 does not operate; When the vehicle brakes or decelerates, it transitions to the energy recovery mode: The clutch 11 is in the disengaged state, and the second motor 4 generates electricity to recover the power during braking or deceleration at the wheel 13.

[0022] During the above process, the vehicle state can be determined by collecting the changes in the throttle signal and speed.

[0023] When the vehicle starts, the pure electric mode is preferentially used; after the vehicle starts and runs stably, the engine 1 starts. When the engine 1 reaches the high - efficiency fuel consumption range, it transitions to the series mode; if the battery SOC value is too low at startup, parking power generation is preferentially performed. When the vehicle is at medium and high speeds, the pure fuel mode is used. If rapid acceleration is performed, the parallel mode is used to provide stronger power. When the battery has low power, while the engine 1 is driving, the first motor 3 can generate electricity.

[0024] The above are only embodiments of the present invention. Specific structures and common knowledge such as characteristics well - known in the art are not described in detail here. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the invention belongs before the application date or the priority date, can know all the existing technologies in this field, and have the ability to apply the conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, combine their own abilities to improve and implement this solution. Some typical well - known structures or well - known methods should not be an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners and the like described in the specification can be used to interpret the content of the claims.

Claims

1. A hybrid drive system, comprising a battery, a first motor, a second motor, an engine and a clutch, the battery being connected to the first motor and the second motor, the engine providing power to the whole vehicle through the clutch engagement, and the second motor providing power to the whole vehicle; Characterized in that: When the vehicle enters a rapid acceleration, the clutch is in the engaged state, and the engine and the second motor jointly provide power for the whole vehicle. The first motor generates electricity when the battery SOC value is low.

2. The hybrid drive system according to claim 1, characterized in that: The output end of the second motor outputs power through a first-stage reduction structure.

3. The hybrid drive system according to claim 2, characterized in that: The first motor is located on the left crank of the engine, and the clutch is connected to the engine crankshaft through a gear structure.

4. The hybrid drive system according to claim 3, characterized in that: The gear structure includes a driving gear and a driven gear that mesh with each other. The driving gear is installed on the crankshaft of the engine, and the driven gear meshes with the clutch.

5. The hybrid drive system according to any one of claims 1-4, characterized in that: The clutch transmits power output outward through a transmission shaft, and the engine and the clutch output power through a first-stage reduction structure.

6. The hybrid drive system according to claim 5, characterized in that: The motor shaft of the second motor is connected to the transmission shaft.

7. A motorcycle, comprising wheels, characterized in that: It also includes the hybrid drive system according to any one of claims 1-6, and the motor shaft of the second motor is connected to the wheel through a sprocket structure.

8. A driving method for a motorcycle Its characteristics include: adopting the hybrid drive system according to any one of claims 1-6, and having six working modes, including the following steps: When the vehicle starts and runs at a low speed, the pure electric mode is adopted: the engine and the first motor do not work, the clutch is in the disengaged state, and the second motor provides power for the whole vehicle; in the pure electric mode, the power transmission direction is: second motor - sprocket structure - wheel; When the vehicle stabilizes and transitions to the series mode: the engine works, the first motor generates electricity, the clutch is in the disengaged state, and the second motor provides power for the whole vehicle; in the series mode, the power transmission direction is: second motor - sprocket structure - wheel; When the vehicle enters medium and high speeds and transitions to the pure fuel mode: the engine works, the first motor does not work, the clutch is in the engaged state, and the second motor does not work. In the pure fuel mode, the power transmission direction is: engine - gear structure - transmission shaft - sprocket structure - wheel; When the vehicle enters a rapid acceleration and transitions to the parallel mode: the engine provides power for the whole vehicle, the first motor generates electricity when the battery SOC value is low, the clutch is in the engaged state, and the second motor provides power for the whole vehicle. In the parallel mode, the power transmission direction is: engine - gear structure - transmission shaft - power coupling of the output shaft of the second motor - sprocket structure - wheel; When the battery has low power, it enters the parking power generation mode: the engine works, the first motor generates electricity, the clutch is in the disengaged state, and the second motor does not work; When the vehicle brakes or decelerates and transitions to the energy recovery mode: the clutch is in the disengaged state, and the second motor generates electricity to recover the power during braking or decelerating at the wheel.

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