A hybrid power system

Abstract

The present application relates to a hybrid power system, including an engine, a transmission mechanism, a first motor, a second motor, a power coupler, a power battery pack and a driving force output shaft, wherein the engine is connected to a first clutch and a second clutch respectively through a transmission mechanism, the first clutch is connected to the first motor rotor, the second clutch is connected to the second motor rotor, the first motor and the second motor are connected to the power coupler through a third clutch and a fourth clutch respectively, the power coupler is connected to the driving force output shaft, the first motor and the second motor are connected through a first inverter, and the first motor and the second motor are connected to the power battery pack through a second inverter and a third inverter respectively. The present application can improve the efficiency of hybrid vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile hybrid power systems, and in particular to a hybrid power system. Background Art

[0002] At present, hybrid vehicles mainly include series hybrid and parallel hybrid. Extended-range hybrid adopts the configuration of series hybrid. When the SOC of the battery is large, electric drive is adopted. There is only one drive motor, which cannot fully utilize the high-efficiency range of the motor, reducing the efficiency of the hybrid vehicle. When the SOC is medium, the extended-range drive engine cannot directly drive the vehicle, which increases the number of energy conversions and reduces the efficiency of the hybrid vehicle. The parallel hybrid vehicle drive wheels and the engine are mechanically connected, so it is difficult for the engine's operating point to always be in the optimal area. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a hybrid power system which can improve the efficiency of a hybrid vehicle.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a hybrid power system, including an engine, a transmission mechanism, a first motor, a second motor, a power coupler, a power battery pack and a driving force output shaft, the engine is respectively connected to a first clutch and a second clutch through a transmission mechanism, the first clutch is connected to the first motor rotor, the second clutch is connected to the second motor rotor, the first motor and the second motor are respectively connected to the power coupler through a third clutch and a fourth clutch, the power coupler is connected to the driving force output shaft, the first motor and the second motor are connected through a first inverter, and the first motor and the second motor are respectively connected to the power battery pack through a second inverter and a third inverter.

[0005] As a preferred solution, the second motor is an integrated motor for electric and electric generation.

[0006] As a preferred solution, the second motor can charge the power battery pack and also serve as a driving source;

[0007] When the first motor and the second motor are used as driving sources, the first motor and the second motor are both in an electric state, and the power battery pack supplies power to the first motor through the second inverter and supplies power to the second motor through the third inverter;

[0008] When the second motor generates electricity and the first motor serves as a driving source, the second motor charges the power battery pack through the third inverter and supplies power to the first motor through the first inverter.

[0009] As a preferred solution, the transmission mechanism includes a first gear, a second gear and a third gear. The third gear is arranged on the output shaft of the engine and is meshed and connected with the first gear and the second gear respectively. The input end of the first clutch is connected to the first gear, and the output end is connected to the first motor rotor. The input end of the second clutch is connected to the second gear, and the output end is connected to the second motor rotor.

[0010] As a preferred solution, the power coupler includes a planetary gear mechanism, a fourth gear and a speed regulating gear.

[0011] The input end of the third clutch is connected to the first motor, and the output end is connected to the fourth gear. The speed regulating gear is respectively meshed and connected with the fourth gear and the ring gear of the planetary gear mechanism. The input end of the fourth clutch is connected to the second motor, and the output end is connected to the sun gear of the planetary gear mechanism. The driving force output shaft is arranged on the planetary carrier of the planetary gear mechanism.

[0012] As a preferred solution, the power coupler also includes a sun gear locking mechanism and a ring gear locking mechanism. When the first motor is driven independently, the sun gear is locked by the sun gear locking mechanism, and when the second motor is driven independently, the ring gear is locked by the ring gear locking mechanism.

[0013] As a preferred solution, the hybrid power system has at least one or more of the following driving modes:

[0014] In pure electric mode, the engine is not started, the first motor is driven independently, the second motor is driven independently, or the first motor and the second motor are driven simultaneously;

[0015] In the extended-range mode, the engine is started, the engine drives the second motor, the second motor acts as a generator to supply energy to the first motor and the power battery pack, and the first motor outputs power through the power coupler;

[0016] In hybrid mode, the engine starts, the second motor starts, the power of the engine is input to the power coupler, and the power of the second motor is also input to the power coupler, realizing parallel hybrid power.

[0017] The beneficial effects of the present invention are: 1. The present application can adopt a dual-motor drive mode, that is, the first motor and the second motor are both used as drive motors, and the power of the first motor and the second motor is coupled through a power coupler to realize power output. The power can be flexibly distributed according to the optimal working point of the first motor and the second motor. Since the single-motor solution adopts a high-power motor, the efficiency is low when the power is small, and the efficiency is also low when the power is large. Therefore, compared with the single-motor drive solution, the motor efficiency can be significantly improved.

[0018] 2. In the extended-range mode of the present application, the engine is started and is always in the most efficient working range. The second motor acts as a generator to supply energy to the first motor and the power battery pack. The first motor outputs power through the power coupler. Because there is no mechanical connection between the engine and the first motor, the engine can always be in the most efficient working range.

[0019] 3. In the hybrid mode of the present application, the engine can directly drive the vehicle. When the vehicle requires high power, it can directly drive the vehicle. Compared with the existing extended-range hybrid power, the number of energy conversions is reduced, which can significantly improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Markings in the figure: 1. engine, 2. first motor, 3. second motor, 4. first gear, 5. second gear, 6. third gear, 7. first clutch, 8. second clutch, 9. third clutch, 10. fourth clutch, 11. power battery pack, 12. fourth gear, 13. speed regulating gear, 14. planetary gear mechanism, 1401. ring gear, 1402. planetary gear, 1403. sun gear, 1404. planetary carrier, 15. driving force output shaft. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that in the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] See also Figure 1The present invention provides a hybrid power system, including an engine 1, a transmission mechanism, a first motor 2, a second motor 3, a power coupler, a power battery pack 11 and a driving force output shaft 15, wherein the engine 1 is connected to a first clutch 7 and a second clutch 8 respectively through the transmission mechanism, the first clutch 7 is connected to the rotor of the first motor 2, the second clutch 8 is connected to the rotor of the second motor 3, the first motor 2 and the second motor 3 are connected to the power coupler through a third clutch 9 and a fourth clutch 10 respectively, the power coupler is connected to the driving force output shaft 15, the first motor 2 and the second motor 3 are connected through a first inverter, the first motor 2 and the second motor 3 are connected to the power battery pack 11 through a second inverter and a third inverter respectively, the second motor 3 is an electric and power generating integrated motor, and the power battery pack 11 can be charged by an external power supply.

[0024] Among them, the second motor 3 can not only charge the power battery pack 11, but also serve as a driving source. When the first motor 2 and the second motor 3 are used as driving sources, the first motor 2 and the second motor 3 are both in an electric state, and the power battery pack 11 supplies power to the first motor 2 through the second inverter and supplies power to the second motor 3 through the third inverter. When the second motor 3 generates electricity and the first motor 2 serves as a driving source, the second motor 3 charges the power battery pack 11 through the third inverter and supplies power to the first motor 2 through the first inverter.

[0025] Specifically, the transmission mechanism includes a first gear 4, a second gear 5 and a third gear 6. The third gear 6 is arranged on the output shaft of the engine 1 and is meshed with the first gear 4 and the second gear 5 respectively. The input end of the first clutch 7 is connected to the first gear 4, and the output end is connected to the rotor of the first motor 2. The first clutch 7, the first gear 4, and the first motor 2 are coaxially arranged. The input end of the second clutch 8 is connected to the second gear 5, and the output end is connected to the rotor of the second motor 3. The second clutch 8, the second gear 5, and the second motor 3 are coaxially arranged. The first clutch 7 controls the combination or separation of the first gear 4 and the rotor of the first motor 2 to control the transmission or interruption of power between the two. The second clutch 8 controls the combination or separation of the second gear 5 and the rotor of the second motor 3 to control the transmission or interruption of power between the two.

[0026] In addition, the power coupler includes a planetary gear mechanism 14, a fourth gear 12 and a speed regulating gear 13. The planetary gear mechanism 14 includes a ring gear 1401, a planetary gear 1402, a sun gear 1403 and a planet carrier 1404. The input end of the third clutch 9 is connected to the first motor 2, and the output end is connected to the fourth gear 12. The speed regulating gear 13 is respectively meshed with the fourth gear 12 and the ring gear 1401 of the planetary gear mechanism 14. The input end of the fourth clutch 10 is connected to the second motor 3, and the output end is connected to the sun gear 1403 of the planetary gear mechanism 14. The driving force output shaft 15 is arranged in the planetary gear mechanism 14. On the planetary carrier 1404, the third clutch 9 controls the engagement or disengagement of the first motor 2 and the fourth gear 12 to control the transmission or interruption of power between the two. The fourth clutch 10 controls the engagement or disengagement of the second motor 3 and the sun gear 1403 to control the transmission or interruption of power between the two. The power coupler also includes a sun gear locking mechanism and a ring gear locking mechanism. When the first motor 2 is driven independently, the sun gear 1403 is locked by the sun gear locking mechanism. When the second motor 3 is driven independently, the ring gear 1401 is locked by the ring gear locking mechanism. It should be noted that the parts not described in detail in this application are all prior art.

[0027] The state of charge SOC of the power battery pack 11 can be divided into three states: large, medium and small. The small SOC is < (0.2~0.3), the large SOC is > (0.7~0.8), and the medium SOC is between the two. In addition, the present application includes multiple driving modes, including a pure electric mode. When the SOC of the power battery pack is medium or large, the pure electric mode can be started. When in the pure electric mode, the first motor 2 is a high-power induction asynchronous motor, and the second motor 3 is a low-power permanent magnet synchronous motor. The first motor 2 or the second motor 3 can be selected to output power according to the required power. When the required power is small, the second motor 3 outputs power. When the required power is large, the first motor 2 outputs power. In order to improve the driving efficiency of the vehicle, when the first motor 2 and the second motor 3 switch the output power, the output power will not be interrupted by coupling the power coupler. When in the pure electric mode, the dual-motor drive mode can also be started. In the dual-motor drive mode, the first motor 2 and the second motor 3 are both used as drive motors, and the power of the first motor 2 and the second motor 3 is coupled through the power coupler to realize power output. The power is flexibly allocated according to the optimal working point of the first motor 2 and the second motor 3. Since the single-motor solution adopts a high-power motor, the efficiency is low when the power is small, and the efficiency is also low when the power is large. Therefore, compared with the single-motor drive solution, this solution can significantly improve the motor efficiency.

[0028] Specifically, it includes an extended-range mode. When the SOC of the power battery pack is small or medium, the extended-range mode can be started. When in the extended-range mode, the engine 1 is started, and the engine 1 is always in the most efficient working range. The second clutch 8 is engaged, and the second motor 3 acts as a generator to power the first motor 2 and the power battery pack 11 at the same time. The first motor 2 outputs power through the power coupler. Because there is no mechanical connection between the engine 1 and the drive motor, i.e., the first motor 2, the engine 1 can always be in the most efficient working range.

[0029] In addition, a hybrid mode is also included. When the SOC of the power battery pack is small or medium, the hybrid mode can be started. When in the hybrid mode, the first motor 2 is an induction asynchronous motor. At this time, the first motor 2 is not powered. The engine 1 drives the rotor of the first motor 2 through the first clutch 7. The power of the engine 1 is output to the input end of the fourth clutch 9 through the rotor of the first motor 2. The output end of the clutch 4 realizes power output through a power coupler. When the vehicle is in the hybrid mode, the output power of the engine 1 and the power of the motor 2 are coupled through the power coupler to realize power output. At this time, the rotor of the first motor 2 is equivalent to the power output shaft of the engine 1. Compared with the extended-range mode, the engine 1 can directly drive the vehicle in the hybrid mode. When the vehicle requires large power, it directly drives the vehicle. Compared with the existing extended-range hybrid power, the number of energy conversions is reduced. Therefore, the use of parallel type under this working condition can significantly improve efficiency.

[0030] The power flow of the present application is as follows: when in pure electric mode, the engine 1 does not work, the third clutch 9 and the fourth clutch 10 are engaged, and the first motor 2 and the second motor 3 output power to the power coupler; when the first motor 2 is driven independently, the first motor 2 is meshed and connected with the ring gear 1401 of the planetary gear mechanism 14 through the speed regulating gear 13, and the sun gear 1403 of the planetary gear mechanism 14 is locked; when the second motor 3 is driven independently, the second motor 3 is connected to the sun gear 1403 of the planetary gear mechanism, the ring gear 1401 of the planetary gear mechanism 14 is locked, and the power coupler realizes power output through the planetary carrier 1404, wherein the clutch not mentioned in this mode is in a disconnected state.

[0031] When in the extended-range mode, the engine 1 is working, the second clutch 8 is engaged, and the engine drives the second motor 3 through the third gear 6, the second gear 5 and the second clutch 8. The second motor 3 acts as a generator to supply energy to the first motor 2 and the power battery pack 11. At this time, the third clutch 9 is engaged, and the first motor 2 realizes power output through the power coupler. Since the first motor 2 is driven independently, the sun gear of the planetary gear mechanism 14 is locked 1403, wherein the clutch not mentioned in this mode is in a disconnected state.

[0032] When in hybrid mode, the engine 1 is working, the first clutch 7, the third clutch 9 and the third clutch 10 are engaged, the engine 1 drives the rotor of the first motor 2 through the third gear 6, the first gear 4 and the first clutch 7, and then the power of the engine 1 is input to the power coupler through the third clutch 9, and the second motor 3 inputs the power to the power coupler through the fourth clutch 10, realizing parallel hybrid power, in which the clutch not mentioned is in a disconnected state in this mode.

[0033] The working principle of the present application is as follows: the present invention includes three driving modes, namely pure electric mode, extended-range mode and hybrid mode. In the pure electric mode, the pure electric mode can be used when the SOC is medium or large. The first motor 2 adopts a high-power induction asynchronous motor, and the second motor 3 adopts a low-power permanent magnet synchronous motor. The power of the first motor 2 and the second motor 3 is matched to improve the range of the motor's high-efficiency zone, thereby improving the efficiency of the parallel-connected extended-range vehicle; in the extended-range mode, when the SOC is small or medium, the extended-range mode can be used. At this time, the engine 1 drives the second motor 3, and the second motor 3 acts as a generator to provide electrical energy to the power battery pack 11 and the first motor 2. Because the engine 1 is not mechanically connected to the first motor 2 at this time, the engine can always be in the most efficient state. Range; hybrid mode, because the engine 1 cannot be driven directly in the extended-range mode, when the SOC is small or medium and driving at high speed, the motor driving efficiency is low, so the hybrid mode can be used. The hybrid mode is a parallel hybrid power, in which the engine 1 drives the rotor of the first motor 2, and then transmits power to the power coupler through the rotor of the first motor 2. At this time, the rotor of the first motor 2 is equivalent to the power output shaft of the engine. At the same time, the second motor 3 also outputs power to the power coupler. The engine 1 and the second motor 3 distribute power according to a certain power distribution strategy. When the SOC is large, only the pure electric mode can be selected. When the SOC is medium, the pure electric mode, the extended-range mode and the hybrid mode can be selected. When the SOC is small, only the extended-range mode and the hybrid mode can be selected.

[0034] It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A hybrid power system, characterized in that: The invention comprises an engine (1), a transmission mechanism, a first motor (2), a second motor (3), a power coupler, a power battery pack (11) and a driving force output shaft (15), wherein the engine (1) is connected to a first clutch (7) and a second clutch (8) respectively through the transmission mechanism, the first clutch (7) is connected to the rotor of the first motor (2), the second clutch (8) is connected to the rotor of the second motor (3), the first motor (2) and the second motor (3) are connected to the power coupler respectively through a third clutch (9) and a fourth clutch (10), the power coupler is connected to the driving force output shaft (15), the first motor (2) and the second motor (3) are connected through a first inverter, and the first motor (2) and the second motor (3) are connected to the power battery pack (11) respectively through a second inverter and a third inverter; The second motor (3) is an integrated motor for electric and electric generation; The power coupler comprises a planetary gear mechanism (14), a fourth gear (12) and a speed regulating gear (13); the input end of the third clutch (9) is connected to the first motor (2), and the output end is connected to the fourth gear (12); the speed regulating gear (13) is meshedly connected to the fourth gear (12) and the ring gear (1401) of the planetary gear mechanism (14), respectively; the input end of the fourth clutch (10) is connected to the second motor (3), and the output end is connected to the sun gear (1403) of the planetary gear mechanism (14); and the driving force output shaft (15) is arranged on the planet carrier (1404) of the planetary gear mechanism (14).

2. A hybrid power system according to claim 1, characterized in that: The second motor (3) can charge the power battery pack (11) and can also serve as a driving source; When the first motor (2) and the second motor (3) are used as driving sources, the first motor (2) and the second motor (3) are both in an electric state, and the power battery pack (11) supplies power to the first motor (2) through the second inverter, and supplies power to the second motor (3) through the third inverter; When the second motor (3) generates electricity and the first motor (2) serves as a driving source, the second motor (3) charges the power battery pack (11) through the third inverter and supplies power to the first motor (2) through the first inverter.

3. A hybrid power system according to claim 1, characterized in that: The transmission mechanism comprises a first gear (4), a second gear (5) and a third gear (6); the third gear (6) is arranged on the output shaft of the engine (1) and is meshed with the first gear (4) and the second gear (5) respectively; the input end of the first clutch (7) is connected to the first gear (4), and the output end is connected to the rotor of the first motor (2); the input end of the second clutch (8) is connected to the second gear (5), and the output end is connected to the rotor of the second motor (3).

4. A hybrid power system according to claim 1, characterized in that: The power coupler also includes a sun gear locking mechanism and a ring gear locking mechanism. When the first motor (2) is driven independently, the sun gear (1403) is locked by the sun gear locking mechanism. When the second motor (3) is driven independently, the ring gear (1401) is locked by the ring gear locking mechanism.

5. A hybrid power system according to any one of claims 1 to 4, characterized in that: The hybrid system has at least one or more of the following driving modes: In the pure electric mode, the engine (1) is not started, the first motor (2) is driven independently, or the second motor (3) is driven independently, or the first motor (2) and the second motor (3) are driven simultaneously; In the extended-range mode, the engine (1) is started, the engine (1) drives the second motor (3), the second motor (3) acts as a generator to supply energy to the first motor (2) and the power battery pack (11), and the first motor (2) outputs power through the power coupler; In the hybrid mode, the engine (1) is started, the second motor (3) is started, the power of the engine (1) is input into the power coupler, and the power of the second motor (3) is also input into the power coupler, thereby realizing a parallel hybrid power.

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