Hybrid power system and vehicle

Abstract

The invention provides a hybrid power system and a vehicle, and relates to the technical field of automobile hybrid power. The hybrid power system comprises an engine, a first motor, a second motor and a first planet row which are sequentially arranged in the same direction. The engine comprises an input shaft, and the first motor and a first sun gear of the first planet row are connected with the input shaft. The second motor is connected with the first motor and a first outer gear ring of the first planet row. A first planet carrier of the first planet row is connected with wheels; wherein the engine can transmit the power of the engine to the first sun gear and the first motor so as to drive the first sun gear to rotate, the first motor can transmit the power to the second motor, and the second motor can drive the first outer gear ring to rotate through the power. According to the technical scheme, the hybrid power system can be more compact, the size and weight are reduced, the power transmission path can be reduced, and the power transmission efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of automobile hybrid power technology, and in particular to a hybrid power system and a vehicle. Background Art

[0002] At present, the hybrid control strategies of mainstream international automakers are mainly divided into two categories: power split hybrid system and series-parallel hybrid system. Among them, the power split hybrid system includes input power split system, output power split system and composite power split system according to the different structures of its transmission.

[0003] The output power split system is connected to two different shafts of the planetary gear through the engine and the generator, and the third shaft of the planetary gear is connected to the differential gear as the output end. The input power of the engine is divided into two and finally converged at the input end of the differential gear, which is the output end of the planetary gear. Since the existing output power split system mostly uses parallel shaft reducers or parallel shaft shifting mechanisms, the hybrid system is large in size and heavy in weight. In addition, since the power of the output power split system needs to be distributed to the drive wheels from multiple power sources (internal combustion engines and electric motors), this increases the complexity of the power transmission path and leads to efficiency loss.

[0004] Therefore, a hybrid power system is needed to at least solve the above problems. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a hybrid power system to solve the problem that the existing hybrid power system is too large in size and weight, resulting in low vehicle efficiency.

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of the present application provides a hybrid power system, comprising: an engine, a first motor, a second motor and a first planetary gear arranged in sequence along the same direction; the engine comprises an input shaft, the first motor and the first sun gear of the first planetary gear are respectively connected to the input shaft; the second motor is respectively connected to the first motor and the first outer gear ring of the first planetary gear; the first planetary carrier of the first planetary gear is connected to the wheel; wherein the engine can transfer its power to the first sun gear and the first motor respectively to drive the first sun gear to rotate, the first motor can transfer the power to the second motor, and the second motor can drive the first outer gear ring to rotate through the power.

[0008] In some embodiments of the present application, the hybrid power system also includes: a second planetary row, the second planetary row is arranged in the same direction on the side of the first planetary row facing away from the second motor, the second sun gear of the second planetary row is connected to the first planetary carrier, and the second planetary carrier of the second planetary row is connected to the wheel.

[0009] In some embodiments of the present application, the hybrid power system further includes: centers of the engine, the first motor, the second motor, the first sun gear, and the second sun gear are all arranged on the same straight line.

[0010] In some embodiments of the present application, the hybrid power system further includes: a first clutch, the first clutch is disposed between the engine and the first motor, and the first clutch is connected to the input shaft to limit the rotation direction of the input shaft.

[0011] In some embodiments of the present application, the hybrid system also includes: a second clutch, the second clutch is connected to the second outer gear ring of the second planetary gear row, and is used to limit the rotation of the second outer gear ring; a third clutch, the third clutch is arranged between the first planetary gear row and the second planetary gear row, the second planetary carrier is connected to the first planetary carrier through the third clutch, and the second sun gear can be fixedly connected to the second planetary carrier through the third clutch.

[0012] In some embodiments of the present application, the second clutch and the third clutch are electromagnetic clutches.

[0013] In some embodiments of the present application, the hybrid power system further includes: a gear mechanism, wherein the gear mechanism is arranged on the side of the second planetary gear row facing away from the first planetary gear row, and the wheel is connected to the second planetary carrier through the gear mechanism; wherein the gear mechanism is arranged in parallel with the second planetary carrier.

[0014] In some embodiments of the present application, the hybrid power system also includes: a control module, the control module including an operating mode strategy module, a first motor control module, a second motor control module, an engine control module and a shift control module; the operating mode strategy module, the operating mode strategy module can realize at least two operating drive modes; the engine control module is driven and connected to the engine to control the start and stop of the engine; the first motor control module is driven and connected to the first motor to control the driving or power generation of the first motor; the second motor control module is driven and connected to the second motor to control the driving or power generation of the second motor; the shift control module is respectively connected to the second clutch and the third clutch to control the opening and closing of the second clutch and / or the third clutch.

[0015] In some embodiments of the present application, the working drive mode includes: a first drive mode, which is achieved by controlling the second clutch to close and the third clutch to open; a second drive mode, which is achieved by controlling the second clutch to open and the third clutch to close.

[0016] A second aspect of the present application provides a vehicle, comprising the hybrid power system provided by the first aspect of the present application.

[0017] Compared with the prior art, the hybrid power system provided in the first aspect of the present application is more compact as a whole by sequentially arranging the engine, the first motor, the second motor and the first planetary gear in the same direction, thereby reducing the volume and weight of the power system. By combining the direct drive of the engine and the power distribution strategy, the engine, the first motor and the second motor can jointly provide instantaneous high power, which can significantly reduce the power transmission path and improve the power transmission efficiency.

[0018] The technical effect of the vehicle provided in the second aspect of the present application has the same or similar technical effect as the hybrid power system provided in the first aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0020] Figure 1 The structure diagram of the hybrid power system of the embodiment of the present application is schematically shown;

[0021] Figure 2 The lever control diagram of the engine, the first motor and the second motor speed in the hybrid power system of the embodiment of the present application is schematically shown;

[0022] Figure 3 The structure diagram of the control module in the hybrid power system of the embodiment of the present application is schematically shown.

[0023] Description of Figure Numbers:

[0024] 1. Engine; 2. First motor; 3. Second motor; 4. First planetary gear; 401. First sun gear; 402. First outer gear ring; 403. First planetary carrier; 5. Second planetary gear; 501. Second sun gear; 502. Second outer gear ring; 503. Second planetary carrier; 6. First clutch; 7. Second clutch; 8. Third clutch; 9. Gear mechanism; 10. Wheel. DETAILED DESCRIPTION

[0025] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0026] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0027] Traditional automobile transmissions are generally divided into five types: AT (automatic transmission), CVT (continuously variable transmission), DCT (dual clutch transmission), MT (manual transmission) and AMT (automatic manual transmission). AT transmission is the mainstream transmission in the current fuel vehicle market, mainly composed of planetary gears, torque converters, clutches and brakes. Since the existing hybrid powertrain systems mostly use parallel shaft reducers or parallel shaft shifting mechanisms, this will lead to problems of large assembly volume and heavy weight. In addition, the traditional automatic transmission distributes power to the drive wheels through multiple power sources, which increases the complexity of the power transmission path and leads to efficiency loss.

[0028] The hybrid power system provided by the present application can improve energy efficiency and performance, and achieve miniaturization and lightness.

[0029] Example 1

[0030] The present application embodiment provides a hybrid power system, such as Figure 1 As shown, it includes: an engine 1, a first motor 2, a second motor 3 and a first planetary row 4 arranged in sequence along the same direction; the engine 1 includes an input shaft, and the first motor 2 and the first sun gear 401 of the first planetary row 4 are respectively connected to the input shaft; the second motor 3 is respectively connected to the first motor 2 and the first outer gear ring 402 of the first planetary row 4; the first planet carrier 403 of the first planetary row 4 is connected to the wheel 10; wherein, the engine 1 can transmit its power to the first sun gear 401 and the first motor 2 respectively to drive the first sun gear 401 to rotate, the first motor 2 can transmit power to the second motor 3, and the second motor 3 can drive the first outer gear ring 402 to rotate through power.

[0031] The engine 1 is responsible for generating the main power output, and the first motor 2 can be a generator motor (MG1), which can be used as a generator or an electric motor and is connected to the input shaft of the engine 1. The second motor 3 can be a drive motor (MG2), which is mainly used to provide auxiliary power output, connected to the first motor 2 and connected to the first outer gear ring 402 of the first planetary row 4, and can drive the first outer gear ring 402 to rotate. The engine 1 and the first motor 2 are connected in series to the first sun gear 401 of the first planetary row 4 as the power input end. The first motor 2 is directly connected to the second motor 3, and the second motor 3 is connected to the outer gear ring of the first planetary row 4, which belongs to the parallel connection power input end. The first planet carrier 403 of the first planetary row 4 is used as the output end, which is responsible for driving the wheel 10 to rotate.

[0032] After the engine 1 is started, a part of the power generated is directly transmitted to the first planetary gear 4 through the first sun gear 401, and this part of the power is mechanical power. The other part of the power of the engine 1 is directly used to drive the first motor 2 to generate electricity, and the generated electric power is transmitted to the second motor 3, which is then converted into mechanical power and transmitted to the first outer gear ring 402 of the first planetary gear 4. Finally, the two parts of the diverted power converge on the first planetary carrier 403 of the first planetary gear 4, and finally transmitted to the wheel 10.

[0033] The hybrid power system provided by the embodiment of the present application arranges the engine 1, the first motor 2, the second motor 3 and the first planetary gear 4 in sequence in the same direction, which makes the whole more compact and reduces the volume and weight of the power system. Through the direct drive and power distribution strategy of the engine 1, the engine 1, the first motor 2 and the second motor 3 can jointly provide instantaneous high power, thereby significantly reducing the power transmission path and improving the power transmission efficiency.

[0034] In some embodiments, the hybrid power system also includes: a second planetary row 5, the second planetary row 5 is arranged in the same direction on the side of the first planetary row 4 facing away from the second motor 3, the second sun gear 501 of the second planetary row 5 is connected to the first planetary carrier 403, and the second planetary carrier 503 of the second planetary row 5 is connected to the wheel 10.

[0035] The above two parts of power converge on the first planet carrier 403 of the first planetary gear 4, and the first planet carrier 403 transmits the converged power to the second sun gear 501 of the second planetary gear 5, and the second planetary gear 5 further distributes the power, and drives the wheel 10 to rotate through the second planet carrier 503. By adding the second planetary gear 5, the system can distribute power more flexibly, thereby expanding the torque range of the system and providing a wider torque output capacity.

[0036] The working principle of the first planetary gear 4 is as follows:

[0037] Through the lever principle of the planetary gear, the lever suppression formula of the speed of the engine 1, the first motor 2 and the second motor 3 is calculated by the following formula:

[0038] ρ1×ω S1 +ω R1 =(1+ρ1)×ω C1 (1)

[0039] ω S1 : Rotational speed of the first sun gear 401 of the first planetary row 4;

[0040] ω R1 : Rotational speed of the first outer gear ring 402 of the first planetary row 4;

[0041] ω C1 : Rotational speed of the first planet carrier 403 of the second planetary row 4;

[0042] ρ1: characteristic parameter of the first planetary gear, which is the number of teeth S of the first sun gear 401 t1 The number of teeth R of the first outer gear ring 402 t1 Ratio:

[0043] like Figure 2 As shown, the horizontal axis is the position of the first sun gear 401, the first planet carrier 403 and the first outer gear ring 402 of the first planetary row 4. When the distance between the first sun gear 401 and the first planet carrier 403 is set to 1, the distance between the first planet carrier 403 and the first outer gear ring 402 is ρ1. The vertical axis is the speed, ω S1 is the speed of the first sun gear 401, ω R1 is the speed of the first outer gear ring 402, ω C1 is the rotation speed of the second planet carrier 503. The lever suppression formula (1) of the three rotation speeds can be obtained through the triangle similarity principle.

[0044] The engine 1 and the first motor 2 are connected in series to the first sun gear 401 of the first planetary gear 4, which is a power input end. The speed of the first sun gear 401 is ω S1 is the speed of the engine 1 and the first motor 2, and the speed of the first outer gear ring 402 ω R1 is the speed of the second motor 3, the speed of the first planetary carrier 403 ω C1 is the output speed of the first planetary gear 4. C1 The speed of the second planetary gear 5 and the speed of the second sun gear 501 ω S2 are equal, as expressed by the following formula:

[0045] ω C1 =ω S2 (2)

[0046] The torque of the first sun gear 401, the torque of the first outer ring gear 402 and the torque of the first planet carrier 403 can be calculated by the following formula:

[0047]

[0048] Similarly, we can deduce T R1 and T S1 The relationship formula is:

[0049]

[0050] T C1 and T S1 The relationship can be expressed by the following formula:

[0051]

[0052] T C1 and T R1 The relationship can be expressed by the following formula:

[0053] T C1 =-(1+ρ1)T R1

[0054] Therefore, the torque T of the first sun gear 401 S1 , the torque T of the first outer gear ring 402 R1 and the torque T of the first planet carrier 403 C1 The torque relationship between the three can also be calculated by the following formula:

[0055] T S1 +T R1 +T C1 =0

[0056] The torque T of the first sun gear 401 S1 Input torque belonging to the first planetary gear 4, T S1 The torque of the first outer gear ring 402 is the combined torque of the engine 1 torque and the first motor 2 torque. R1 Also belongs to the input torque, the first planet carrier 403 torque T C1 Belongs to the output torque, T C1 It is T S1 and T R1 The resultant torque.

[0057] Since the first planet carrier 403 is connected to the second sun gear 501, the torque T of the first planet carrier 403 C1 and the torque T of the second sun gear 501 of the second planetary gear 5 S2 Equal, as expressed by the following formula:

[0058] T C1 =T S2(4)

[0059] The power of the first planet carrier 403 is output to the second sun gear 501 as the power input of the second planetary gear 5. The second planet carrier 503 serves as the power output end, which can achieve efficient torque transmission and speed conversion, thereby improving the efficiency of the entire hybrid system.

[0060] In some embodiments, the centers of the engine 1 , the first motor 2 , the second motor 3 , the first sun gear 401 , and the second sun gear 501 are all arranged on the same straight line.

[0061] By arranging the centers of the engine 1, the first motor 2, the second motor 3, the first sun gear 401 and the second sun gear 501 on the same straight line, the layout of the entire power system is made more compact, which can reduce the weight and volume of the entire system. The straight-line arrangement reduces the complexity of the power transmission path, thereby reducing losses during power transmission.

[0062] In some embodiments, the hybrid power system further includes: a first clutch 6, which is disposed between the engine 1 and the first motor 2, and is connected to the input shaft to limit the rotation direction of the input shaft.

[0063] The first clutch 6 can be an existing one-way clutch. The first clutch 6 is arranged between the engine 1 and the first motor 2 and connected to the input shaft of the engine 1. It can prevent the input shaft of the engine 1 from rotating in the reverse direction and allow the engine 1 to rotate forward, thereby realizing one-way transmission of power. By limiting reverse rotation, when the vehicle is in a braking state or a low-speed state, the first clutch 6 can prevent the engine 1 from being reversely driven by the first motor 2, thereby avoiding energy waste.

[0064] In some embodiments, Figure 1 As shown, the hybrid system also includes: a second clutch 7, which is connected to the second outer gear ring 502 of the second planetary row 5 and is used to limit the rotation of the second outer gear ring 502; a third clutch, which is arranged between the first planetary row 4 and the second planetary row 5, and the second planetary carrier 503 is connected to the first planetary carrier 403 through the third clutch, and the second sun gear 501 can be fixedly connected to the second planetary carrier 503 through the third clutch.

[0065] The second outer gear ring 502 of the second planetary row 5 is connected through the second clutch 7, and the first planetary carrier 403 of the first planetary row 4 and the second planetary carrier 503 of the second planetary row 5 are connected through the third clutch. The power transmission path can be changed by controlling the states of the second clutch 7 and the third clutch, thereby realizing two-speed shifting.

[0066] Specifically, the working principle of the second planetary gear 5 to achieve two-speed shifting is as follows:

[0067] As can be seen from the above, the power of the first planet carrier 403 is output to the second sun gear 501 as the power input end of the second planetary gear 5, and the second planet carrier 503 of the second planetary gear 5 is the power output end.

[0068] 1st gear shift: control the second clutch 7 to close, the third clutch to open, the second outer gear ring 502 and the housing to be fixed, and the rotation speed of the second outer gear ring 502 to be zero.

[0069] Through the lever principle of the planetary gear, the lever suppression formula of the engine 1, the generator and the drive motor speed in the second planetary gear 5 is calculated by the following formula:

[0070] ρ2×ω S2 +ω R2 =(1+ρ2)×ω C2 (5)

[0071] ω S2 : Sun gear speed of the second planetary gear 5

[0072] ω R2 : Ring gear speed of the second planetary gear 5

[0073] ω C2 : Planet carrier speed of the second planetary gear 5

[0074] ρ2: characteristic parameter of the second planetary gear 5, number of teeth S of the second sun gear 501 t2 The number of teeth R of the second outer gear ring 502 t2 Ratio:

[0075]

[0076] When the second outer gear ring 502 of the second planetary gear 5 is locked, the formula ω is obtained. R2 =0, and this formula is substituted into formula (5), with the second sun gear 501 as input, the transmission ratio formula of the output of the second planet carrier 503 can be obtained:

[0077]

[0078] From the above formula, we can see that 0<ρ2<1, so the transmission ratio i2>2.

[0079] The torque of the second sun gear 501, the torque of the second outer gear ring 502 and the torque of the second planet carrier 503 can be calculated by the following formula:

[0080]

[0081] T S2 : Torque of the second sun gear 501;

[0082] T R2 : Torque of the second outer gear ring 502;

[0083] T C2 : Torque of the second planetary carrier 503.

[0084] From the above formula, it can be deduced that the relationship between the torque of the second sun gear 501 and the torque of the second planet carrier 503 is calculated by the following formula:

[0085]

[0086] From the above formula, we can know that the output end torque second planet carrier 503 (T C2 ) is greater than the input torque of the second sun gear 501 (T S2 ). Therefore, the first gear shift can realize the vehicle's low-speed and high-torque acceleration, and the engine 1, the first motor 2 and the second motor 3 can work simultaneously to effectively improve the vehicle's climbing ability.

[0087] 2nd gear shift: Control the second clutch 7 to open, the third clutch to close, the second sun gear 501 (power input end) and the second outer gear ring 502 (power output end) to connect, so ω S2 =ω C2 , from formula (5) we can get:

[0088] ω S2 =ω R2 =ω C2 (9)

[0089] It is known that the three speeds must be equal, that is, the torques are also equal, so the following formula can be obtained:

[0090]

[0091] According to the action principle of the planetary gear lever, the second sun gear 501 and the second planet carrier 503 are connected as one body, and the rotation speeds of the second outer gear ring 502, the second sun gear 501 and the second planet carrier 503 must be equal, that is, equal speed and equal torque, so it can be used as high-speed 2nd gear. 2nd gear shifting can effectively increase the maximum speed of the whole vehicle when driving at high speed.

[0092] In some embodiments, the second clutch 7 and the third clutch 8 are electromagnetic clutches.

[0093] The electromagnetic clutch uses electromagnetic force to engage or disengage two rotating parts, and its response time is very short, usually in milliseconds. This means it can be engaged or disengaged quickly. Compared with traditional oil pressure control, the electromagnetic clutch does not require an oil pump, oil pipelines, and other hydraulic components, which not only reduces the size, but also reduces the weight, helping to achieve a more compact hybrid system design.

[0094] In some embodiments, the hybrid power system further includes: a gear mechanism 9, which is arranged on the side of the second planetary gear 5 facing away from the first planetary gear 4, and the wheel 10 is connected to the second planetary carrier 503 through the gear mechanism 9; wherein the gear mechanism 9 is arranged in parallel with the second planetary carrier 503.

[0095] The gear mechanism 9 is arranged on the side of the second planetary gear 5 facing away from the first planetary gear 4, and the wheel 10 is connected to the second planetary carrier 503 through the gear mechanism 9. The gear mechanism 9 is arranged in parallel with the second planetary carrier 503, and as the final reduction mechanism, it is connected to the differential to drive the wheel 10. The differential can adopt the existing structure, which is composed of planetary gears, planetary gear carriers (differential case), half-axle gears and other parts. After the output power enters the differential, it can directly drive the planetary gear carrier, and then the planetary gear drives the left and right half-axles to drive the left and right wheels 10 respectively. The differential can enable the wheel 10 to rotate at different speeds, so that when the vehicle turns, the inner and outer wheels 10 can maintain the correct rotation speed difference, thereby preventing the vehicle from skidding or losing control.

[0096] In some embodiments, Figure 3 As shown, the hybrid power system also includes: a control module, the control module includes a working mode strategy module, a first motor 2 control module, a second motor 3 control module, an engine 1 control module and a shift control module; a working mode strategy module, the working mode strategy module can realize at least two working drive modes; the engine 1 control module is driven and connected to the engine 1 to control the start and stop of the engine 1; the first motor 2 control module is driven and connected to the first motor 2 to control the driving or power generation of the first motor 2; the second motor 3 control module is driven and connected to the second motor 3 to control the driving or power generation of the second motor 3; the shift control module is respectively connected to the second clutch 7 and the third clutch 8 to control the opening and closing of the second clutch 7 and / or the third clutch 8.

[0097] The working mode strategy module can realize at least two working driving modes, such as pure electric mode, hybrid mode, energy-saving mode, etc. The best working mode can be determined according to the actual driving conditions of the vehicle, the needs of the driver, the battery power status, the efficiency of the engine 1 and other factors.

[0098] The engine 1 control module is connected to the engine 1 and controls the start and stop of the engine 1. The engine 1 can be started or shut down at the right time according to the instruction of the working mode strategy module to achieve the best fuel efficiency and emission performance.

[0099] The first motor 2 control module is driven and connected to the first motor 2 to control the working state (driving or generating) of the first motor 2. The first motor 2 can be used as an auxiliary power source to help the engine 1 drive the vehicle, or as a generator to recover energy during braking.

[0100] The second motor 3 control module is drive-connected to the second motor 3 to control the working state (driving or generating electricity) of the second motor 3. The second motor 3 can independently drive the vehicle, work in pure electric mode, and can also participate in energy recovery when needed.

[0101] The shift control module is connected to the second clutch 7 and the third clutch 8 respectively to control the opening and closing of the two clutches. By controlling the state of the clutch, a smooth switching of the power system can be achieved, such as switching from a pure electric mode to a hybrid mode.

[0102] The control algorithms of the above modules can be implemented by integrating the hybrid vehicle controller (HCU) and the automatic transmission controller (TCU) in the motor control unit (MCU).

[0103] The Motor Control Unit (MCU) is the core electronic module of a hybrid vehicle, responsible for controlling the speed and acceleration of the vehicle according to the driver's throttle input. The MCU converts the DC voltage of the vehicle battery into a three-phase AC voltage to drive the motor through a voltage source inverter and pulse width modulation.

[0104] The functions of the hybrid vehicle controller (HCU) may include overall scheduling of the vehicle control unit application functions, dynamic health management of charging planning functions such as intelligent operation and maintenance and intelligent charging, torque management, transmission management, body control, engine 1 control, vehicle mode, etc.

[0105] The automatic transmission controller (TCU, Transmission Control Unit) is one of the core control systems of the vehicle. The automatic transmission controller mainly includes an electronic control unit, a sensor and an actuator. The function of the electronic control unit is to process the sensor signal of the current vehicle driving state, issue instructions according to the control program, and control the gear shift. The actuator is mainly driven by the solenoid valve according to the current and voltage drive signals output by the automatic transmission electronic control unit to drive the orderly operation of the actuator of the automatic transmission. In addition, the solenoid valve is an electromagnetic control equipment, which cooperates with the circuit to achieve the expected control and has high control accuracy and flexibility. During the operation of the car, the automatic transmission controller can process various sensor signals of the current vehicle driving state and determine the current gear position that the driver intends to control the vehicle. For example, when the PRND is dialed to the D gear, the vehicle can be accelerated by stepping on the accelerator and decelerated by stepping on the brake pedal. There is no need for manual shifting, which can be achieved by the automatic transmission controller.

[0106] The motor control unit (MCU) receives various sensor data from the vehicle, such as throttle opening signal, vehicle speed signal, voltage signal, etc. This information can help the motor control unit understand the current driving status of the vehicle and make corresponding adjustments. Based on the received data, the motor control unit calculates the appropriate control signal and sends it to the above modules. The modules output the control signal through algorithm calculation.

[0107] Among them, the throttle opening signal can be obtained through the throttle opening sensor. When the driver steps on the accelerator pedal, the throttle opening sensor detects the position change of the pedal. The throttle opening sensor converts this position change into an electrical signal, which is input to the motor control unit. The motor control unit calculates a target torque signal according to the position of the accelerator pedal. The target torque signal indicates how much torque the engine 1, the first motor 2 and the second motor 3 should output. The vehicle speed signal can be obtained through the vehicle speed sensor. The vehicle speed sensor is usually integrated in the ABS (Antilock Braking System) system to monitor the actual driving speed of the vehicle. The ABS system collects the wheel 10 speed information through the sensor, and then transmits this information to the motor control unit through the CAN bus. The BMS (Battery Management System) is used to monitor key parameters such as the voltage, current and temperature of the battery pack. The BMS system transmits these data to the vehicle's motor control unit through the CAN bus. The motor control unit adjusts the working state of the engine 1 and the motor according to the state of the battery to ensure the safe operation of the battery and optimize energy utilization.

[0108] By integrating the functions of multiple controllers into one motor control unit, the amount of hardware is reduced, the hybrid system structure is simplified, and the cost is reduced.

[0109] The output signal of the control module includes the output power split mechanism drive command and the shift control command. The output power split mechanism drive command includes: the drive torque command, shutdown command and cylinder deactivation command of the engine 1; the drive torque command and power generation torque command of the first motor 2; the drive torque command and power generation torque command of the third motor. The shift control command includes 1st gear shift and 2nd gear shift, that is, the working process of the double planetary gear described above.

[0110] In some embodiments, the working driving modes include: a first driving mode, which is achieved by controlling the second clutch 7 to close and the third clutch 8 to open; a second driving mode, which is achieved by controlling the second clutch 7 to open and the third clutch 8 to close.

[0111] According to the above description of the working process of the double planetary gearbox, it can be known that the first driving mode is the 1st gear shift and the second driving mode is the 2nd gear shift.

[0112] Specifically, the working mode also includes:

[0113] (1) Parking charging mode

[0114] When the vehicle is parked in P gear and the battery SOC is low, the vehicle enters parking charging mode. In this mode, the engine 1 starts and drives the first motor 2 to generate electricity. The power generated by the engine 1 is only used to drive the first motor 2, and the electric energy generated by the first motor 2 can be stored in the vehicle battery to improve the battery SOC.

[0115] When the vehicle stops, the second planet carrier 503 of the second planetary gear 5 also stops. By closing the second clutch 7 and keeping the third clutch 8 open, the first gear shifting working mode can be entered, which makes the first planet carrier 403 of the first planetary gear 4 stop rotating. Through the lever principle of the first planetary gear 4, when the first motor 2 is generating electricity, the second motor 3 can be idle or participate in generating electricity.

[0116] Therefore, when the SOC is low, the engine 1 only drives the first motor 2 to generate electricity, and the second motor 3 idles. By using only the first motor 2 to generate electricity, energy loss can be reduced and charging efficiency can be improved. When the SOC is extremely low, in order to increase the battery SOC faster, the engine 1 drives the first motor 2 and the second motor 3 to generate electricity at the same time. By using two motors to generate electricity at the same time, the battery SOC can be increased faster and the charging time can be shortened.

[0117] (2) Pure electric drive mode

[0118] When the vehicle starts or is driving at low speed, if the SOC value of the power battery is high and the current vehicle speed is lower than the speed limit in pure electric mode, and the on-board battery SOC is within the limited range, the vehicle enters pure electric drive mode.

[0119] In this mode, the engine 1 and the first motor 2 connected to the first sun gear 401 of the first planetary row 4 are turned off, so that the first sun gear 401 of the first planetary row 4 stops rotating. The second motor 3 provides power through the lever principle of the first planetary row 4. The second motor 3 drives the first outer gear ring 402 of the first planetary row 4, and then outputs power to the second sun gear 501 of the second planetary row 5 through the first planet carrier 403 of the first planetary row 4.

[0120] Since the motor has higher efficiency at low speeds, the pure electric drive mode can give full play to the advantages of the motor and improve the overall energy efficiency of the vehicle.

[0121] (3) Energy recovery mode

[0122] When the vehicle decelerates and brakes and the battery SOC is insufficient, the wheel 10 generates negative torque. At this time, the engine 1 and the first motor 2 connected to the first sun gear 401 of the first planetary gear 4 are turned off, causing the first sun gear 401 of the first planetary gear 4 to stop rotating. Through the lever principle of the first planetary gear 4, the second motor 3 is driven to generate electricity.

[0123] The generated electric energy is stored in the on-board battery to improve the battery SOC. According to the vehicle's speed, the second planetary gear 5 works in different gears:

[0124] When the vehicle is running at high speed, the second planetary gear 5 works in the 2nd gear. When the vehicle is running at low speed, the second planetary gear 5 works in the 1st gear. The switching speed between the 1st gear and the 2nd gear can usually be positioned at 20km / h. Through the energy recovery mode, the braking energy can be used to charge the battery to improve the battery SOC. At the same time, during deceleration braking, the motor is used for energy recovery to improve the overall energy utilization efficiency.

[0125] (4) Hybrid drive mode 1

[0126] When the vehicle is in a low-speed high-torque climbing condition or the vehicle is in the ejection start mode, the power required by the vehicle is greater than the maximum power that the engine 1 can output. In this case, the first motor 2 and the second motor 3 can provide power at the same time. The engine 1, the first motor 2 and the second motor 3 jointly drive the planetary gear system to work stably to provide the maximum driving force. The second planetary gear 5 works in the 1st gear mode to meet the needs of low-speed high torque. When low-speed high torque is required, the engine 1 and the two motors work together to provide the maximum driving force to meet the needs of climbing or ejection start.

[0127] (5) Hybrid Drive Mode 2

[0128] When the vehicle is running at a high load condition at medium and high speed, if the power demanded by the vehicle is greater than the maximum power output when the engine 1 is running, the motor is required to supplement the output power. The engine 1 performs power diversion through the first planetary gear 4, and a part of the torque is output through the first planetary carrier 403 of the first planetary gear 4, and the other part of the torque is used for the first motor 2 to charge the battery. At this time, the first motor 2 is in the power generation mode, and the second motor 3 is in the driving mode, driving the first outer gear ring 402 of the first planetary gear 4 to provide power, and the power of the engine 1 is combined at the first planetary carrier 403 of the first planetary gear 4, and output to the second sun gear 501 of the second planetary gear 5 to provide output power. At this time, the second planetary gear 5 works in the 2nd gear mode to meet the needs of medium and high speed driving.

[0129] Under high-load conditions at medium and high speeds, the coordinated work of the engine 1 and the motor can provide sufficient driving force to ensure that the vehicle can meet driving needs.

[0130] (6) Direct drive mode

[0131] When the vehicle is in a high-speed and low-load condition, the engine 1 drives the vehicle alone. In this mode, the engine 1 is connected to the first sun gear 401 of the first planetary gear row 4 and provides power alone. The second motor 3 connected to the first outer ring gear 402 of the first planetary gear row 4 follows the movement of the engine 1, but does not provide power or generate electricity. The first motor 2 connected to the first sun gear 401 of the first planetary gear row 4 stops working and follows the movement of the engine 1, but does not provide power or generate electricity. Since the vehicle is in a high-speed driving state, the second planetary gear row 5 works in the second gear mode, which can meet the needs of high-speed driving.

[0132] Under high-speed and low-load conditions, the efficiency of high-speed driving of the motor is not high, so direct driving by the engine 1 can reduce energy waste and improve overall energy efficiency.

[0133] The hybrid power system provided in the embodiment of the present application is connected in series to the first sun gear 401 of the first planetary gear 4 through the engine 1 and the first motor 2, which serves as the power input end, and can achieve efficient power transmission. The second motor 3 is connected to the first outer gear ring 402 of the first planetary gear 4, which can provide additional power support or energy recovery. By arranging the engine 1, the first motor 2 and the second motor 3 coaxially, it is helpful to reduce the volume of the assembly system and achieve a compact design. This compact design helps to improve the overall space utilization of the vehicle, while reducing the weight of the vehicle and improving energy efficiency. The automatic shifting function of the 2-speed transmission is realized by electromagnetically controlling the opening and closing of the second clutch 7 and the third clutch 8. The 2-speed automatic shifting function can not only improve the climbing ability, but also provide a higher transmission ratio when driving at high speed, thereby increasing the maximum speed of the vehicle.

[0134] Example 2

[0135] An embodiment of the present application provides a vehicle, including the hybrid power system provided by Embodiment 1 of the present application.

[0136] By adopting the hybrid power system provided in Example 1, a vehicle can achieve an efficient, flexible and compact design, improve the vehicle's climbing ability and maximum speed, while reducing energy consumption, improving energy utilization efficiency, and providing a better driving experience.

[0137] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A hybrid power system, characterized in that: include: An engine (1), a first motor (2), a second motor (3) and a first planetary gear (4) are arranged in sequence along the same direction; The engine (1) comprises an input shaft, and the first motor (2) and the first sun gear (401) of the first planetary gear (4) are respectively connected to the input shaft; The second motor (3) is respectively connected to the first motor (2) and the first outer gear ring (402) of the first planetary gear (4); The first planet carrier (403) of the first planetary gear (4) is connected to the wheel (10); The engine (1) is capable of transmitting its power to the first sun gear (401) and the first motor (2) respectively, so as to drive the first sun gear (401) to rotate; the first motor (2) is capable of transmitting the power to the second motor (3); and the second motor (3) is capable of driving the first outer gear ring (402) to rotate through the power.

2. The hybrid power system according to claim 1, characterized in that: Also includes: A second planetary row (5), the second planetary row (5) is arranged along the same direction on a side of the first planetary row (4) facing away from the second motor (3), the second sun gear (501) of the second planetary row (5) is connected to the first planetary carrier (403), and the second planetary carrier (503) of the second planetary row (5) is connected to the wheel (10).

3. The hybrid power system according to claim 2, characterized in that: Also includes: The centers of the engine (1), the first motor (2), the second motor (3), the first sun gear (401) and the second sun gear (501) are all arranged on the same straight line.

4. The hybrid power system according to claim 1, characterized in that: Also includes: A first clutch (6), wherein the first clutch (6) is arranged between the engine (1) and the first motor (2), and the first clutch (6) is connected to the input shaft and is used to limit the rotation direction of the input shaft.

5. The hybrid power system according to claim 2, characterized in that: Also includes: A second clutch (7), the second clutch (7) being connected to the second outer gear ring (502) of the second planetary gear (5) and being used to limit the rotation of the second outer gear ring (502); A third clutch (8), wherein the third clutch (8) is arranged between the first planetary gear (4) and the second planetary gear (5), the second planetary carrier (503) is connected to the first planetary carrier (403) via the third clutch (8), and the second sun gear (501) can be fixedly connected to the second planetary carrier (503) via the third clutch (8).

6. The hybrid power system according to claim 5, characterized in that: The second clutch (7) and the third clutch (8) are electromagnetic clutches.

7. The hybrid power system according to claim 2, characterized in that: Also includes: a gear mechanism (9), the gear mechanism (9) being arranged on a side of the second planetary gear (5) facing away from the first planetary gear (4), and the wheel (10) being connected to the second planetary carrier (503) via the gear mechanism (9); Wherein, the gear mechanism (9) and the second planet carrier (503) are arranged in parallel.

8. The hybrid power system according to claim 5, characterized in that: Also includes: A control module, the control module comprising a working mode strategy module, a first motor (2) control module, a second motor (3) control module, an engine (1) control module and a shift control module; The working mode strategy module, the working mode strategy module can realize at least two working driving modes; The engine (1) control module is drivingly connected to the engine (1) to control the start and stop of the engine (1); The first motor (2) control module is drivingly connected to the first motor (2) to control the first motor (2) to drive or generate electricity; The second motor (3) control module is drivingly connected to the second motor (3) to control the second motor (3) to drive or generate electricity; The shift control module is connected to the second clutch (7) and the third clutch (8) respectively, and controls the opening and closing of the second clutch (7) and / or the third clutch (8).

9. The hybrid power system according to claim 8, characterized in that: The working driving modes include: a first driving mode, wherein the first driving mode is achieved by controlling the second clutch (7) to be closed and the third clutch (8) to be open; The second driving mode is achieved by controlling the second clutch (7) to be open and the third clutch (8) to be closed.

10. A vehicle, characterized in that: Comprising a hybrid power system according to any one of claims 1-9.

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