Hybrid system for vehicle and vehicle

Abstract

The application provides a vehicle hybrid power system and vehicle, the vehicle hybrid power system comprises a first power module (power split module) and a second power module (electric axle module). In the first power module, the sun gear of a planetary gear mechanism is always in transmission connection with a first motor, the planetary carrier is always in transmission connection with an engine, and the ring gear is always in transmission connection with a pair of wheels of the vehicle via a first differential; in the second power module, a second motor is always in transmission connection with another pair of wheels of the vehicle via a second differential. In this way, the vehicle hybrid power system according to the application not only can realize all working modes of the existing power split hybrid power system, but also can make the vehicle realize better longitudinal performance while making the fuel consumption of the vehicle very good.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicles, and more particularly to a hybrid power system for vehicles and a vehicle comprising the same. BACKGROUND

[0002] In the existing hybrid vehicles, according to the topology of the hybrid power system, they can be divided into two groups: parallel / series / parallel-series hybrid power system and power split hybrid power system. For the power split hybrid power system represented by the THS hybrid power system of Toyota, although such power split hybrid power system makes the fuel consumption of the vehicle very good, the longitudinal performance (such as the acceleration time of 100km / h and the maximum climbing ability, etc.) of the hybrid power system is not ideal. SUMMARY

[0003] In view of the defects of the prior art described above, the present application is made. One object of the present application is to provide a new type of hybrid power system for vehicles, which not only makes the fuel consumption of the vehicle very good, but also enables the vehicle to achieve better longitudinal performance. Another object of the present application is to provide a vehicle comprising the hybrid power system for vehicles described above.

[0004] In order to achieve the above-mentioned objects of the present application, the present application adopts the following technical solutions.

[0005] The present application provides a hybrid power system for vehicles, which comprises a first power module and a second power module,

[0006] The first power module comprises an engine, a first motor, a planetary gear mechanism and a first differential, the planetary gear mechanism comprises a sun gear, a plurality of planet gears, a planet carrier and a ring gear, the sun gear is always drivingly coupled with the first motor, the planet carrier is always drivingly coupled with the engine, the ring gear is always drivingly coupled with a pair of wheels of the vehicle via the first differential, and

[0007] The second power module comprises a second motor and a second differential, the second motor is always drivingly coupled with another pair of wheels of the vehicle via the second differential.

[0008] Preferably, the first power module further comprises an input gear for the first differential, the ring gear is formed with external teeth, the ring gear is engaged with the input gear via the external teeth, thereby drivingly coupled with the first differential; and / or

[0009] The second motor is drivingly coupled with the second differential through a one-stage reduction mechanism formed by a gear pair.

[0010] More preferably, the first power module further includes a clutch, which prevents the planetary gear carrier from rotating when the clutch is engaged and allows the planetary gear carrier to rotate when the clutch is disengaged.

[0011] More preferably, the hybrid power system for vehicles further includes a control module, which is capable of controlling the hybrid power system to enable the vehicle to achieve two-wheel drive mode and four-wheel drive mode.

[0012] When the vehicle hybrid system puts the vehicle in the two-wheel drive mode, the first power module is used for driving and the vehicle hybrid system is in hybrid drive mode, or the second power module is used for driving and the vehicle hybrid system is in pure electric motor drive mode.

[0013] When the vehicle hybrid system puts the vehicle in the four-wheel drive mode, the first power module and the second power module are used for driving and the vehicle hybrid system is in hybrid drive mode.

[0014] More preferably, when the vehicle's hybrid power system is in the hybrid drive mode, the following conditions are met:

[0015] T Output =T Output_req ,

[0016]

[0017]

[0018]

[0019] n ICE =n ICE_hybStrategy ,

[0020] n M1 =n ICE *(1+i g )-n Output *i g ,and

[0021]

[0022]

[0023] Where T Output This is the torque output from the gear ring, measured in Nm (Newton-meter); T Output_req The output torque required by the first power module, as determined by the vehicle, is expressed in Nm; T ICE This refers to the specified torque of the engine, measured in Nm; TM1 This is the specified torque of the first motor, in Nm; T M2 This is the specified torque of the second motor, in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, measured in Nm; n Output This refers to the rotational speed of the gear ring, measured in rpm (revolutions per minute); n Whl n is the rotational speed of the pair of wheels, measured in rpm; ICE n is the engine speed, measured in rpm; ICE_hybStrategy n is the target engine speed determined by the vehicle, in rpm; M1 This is the rotational speed of the first motor, in rpm; n M2 This refers to the rotational speed of the second motor, measured in rpm; i g It is the ratio of the number of internal teeth of the gear ring to the number of teeth of the sun gear; i Whl2Output It is the transmission ratio from the pair of wheels to the gear ring; i Whl2M2 It is the transmission ratio from the other pair of wheels to the second motor.

[0024] More preferably, when the vehicle hybrid system is in the pure electric motor drive mode, the following conditions are met:

[0025] T Output =0,

[0026] T ICE =0,

[0027] T M1 =0,

[0028]

[0029] n ICE =0,

[0030] n M1 =-n Output *i g ,and

[0031]

[0032]

[0033] Where T Output This is the torque output from the gear ring, measured in Nm (Newton-meter); T ICE This refers to the specified torque of the engine, measured in Nm; T M1 This is the specified torque of the first motor, in Nm; T M2 This is the specified torque of the second motor, in Nm; TWhlDrvReq This is the total wheel-side output torque required by the vehicle, measured in Nm; n Output This refers to the rotational speed of the gear ring, measured in rpm (revolutions per minute); n Whl n is the rotational speed of the pair of wheels, measured in rpm; ICE n is the engine speed, measured in rpm; M1 This is the rotational speed of the first motor, in rpm; n M2 This refers to the rotational speed of the second motor, measured in rpm; i g It is the ratio of the number of internal teeth of the gear ring to the number of teeth of the sun gear; i Whl2Output It is the transmission ratio from the pair of wheels to the gear ring; i Whl2M2 It is the transmission ratio from the other pair of wheels to the second motor.

[0034] More preferably, the hybrid power system for vehicles further includes a control module, which is capable of controlling the hybrid power system to enable the vehicle to achieve two-wheel drive mode and four-wheel drive mode.

[0035] When the vehicle hybrid system puts the vehicle in the two-wheel drive mode and the clutch is engaged, the second power module drives the vehicle and the vehicle hybrid system is in pure electric motor drive mode; when the vehicle hybrid system is in the two-wheel drive mode and the clutch is disengaged, the first power module drives the vehicle and the vehicle hybrid system is in hybrid drive mode, and

[0036] When the vehicle hybrid system puts the vehicle in the four-wheel drive mode and the clutch is engaged, the first power module and the second power module are used for driving and the vehicle hybrid system is in pure electric motor drive mode; when the vehicle hybrid system puts the vehicle in the four-wheel drive mode and the clutch is disengaged, the first power module and the second power module are used for driving and the vehicle hybrid system is in hybrid drive mode.

[0037] More preferably, when the vehicle hybrid system is in the pure electric motor drive mode, the following conditions are met:

[0038] T Output =T Output_req ,

[0039] T ICE =0,

[0040]

[0041]

[0042] n ICE =0,

[0043] n M1 =-n Output *i g ,and

[0044]

[0045]

[0046] Where T Output This is the torque output from the gear ring, measured in Nm (Newton-meter); T Output_req The output torque required by the first power module, as determined by the vehicle, is expressed in Nm; T ICE This refers to the specified torque of the engine, measured in Nm; T M1 This is the specified torque of the first motor, in Nm; T M2 This is the specified torque of the second motor, in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, measured in Nm; n Output This refers to the rotational speed of the gear ring, measured in rpm (revolutions per minute); n Whl n is the rotational speed of the pair of wheels, measured in rpm; ICE n is the engine speed, measured in rpm; M1 This is the rotational speed of the first motor, in rpm; n M2 This refers to the rotational speed of the second motor, measured in rpm; i g It is the ratio of the number of internal teeth of the gear ring to the number of teeth of the sun gear; i Whl2Output It is the transmission ratio from the pair of wheels to the gear ring; i Whl2M2 It is the transmission ratio from the other pair of wheels to the second motor.

[0047] More preferably, when the vehicle's hybrid power system is in the hybrid drive mode, the following conditions are met:

[0048] T Output =T Output_req ,

[0049]

[0050]

[0051]

[0052] n ICE =n ICE_hybStrategy ,

[0053] n M1 =n ICE *(1+i g )-n Output *i g ,and

[0054]

[0055]

[0056] Where T Output This is the torque output from the gear ring, measured in Nm (Newton-meter); T Output_req The output torque required by the first power module, as determined by the vehicle, is expressed in Nm; T ICE This refers to the specified torque of the engine, measured in Nm; T M1 This is the specified torque of the first motor, in Nm; T M2 This is the specified torque of the second motor, in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, measured in Nm; n Output This refers to the rotational speed of the gear ring, measured in rpm (revolutions per minute); n Whl n is the rotational speed of the pair of wheels, measured in rpm; ICE n is the engine speed, measured in rpm; ICE_hybStrategy n is the target engine speed determined by the vehicle, in rpm; M1 This is the rotational speed of the first motor, in rpm; n M2 This refers to the rotational speed of the second motor, measured in rpm; i g It is the ratio of the number of internal teeth of the gear ring to the number of teeth of the sun gear; i Whl2Output It is the transmission ratio from the pair of wheels to the gear ring; i Whl2M2 It is the transmission ratio from the other pair of wheels to the second motor.

[0057] The present invention also provides a vehicle comprising the hybrid power system for vehicles described in any one of the above technical solutions.

[0058] By adopting the above technical solution, the present invention provides a hybrid power system and a vehicle, the hybrid power system comprising a first power module (power split module) and a second power module (electric axle module). In the first power module, the sun gear of the planetary gear mechanism is always driven by a first motor, the planetary gear carrier is always driven by an engine, and the ring gear is always driven by a pair of wheels of the vehicle via a first differential; in the second power module, the second motor is always driven by a second differential to another pair of wheels of the vehicle. Thus, the hybrid power system of the present invention not only realizes all the operating modes of existing power split hybrid power systems, but also achieves good longitudinal performance of the vehicle while maintaining good fuel economy. Attached Figure Description

[0059] Figure 1a This is a schematic diagram showing the topology of a hybrid power system for vehicles according to a first embodiment of the present invention. Figure 1b yes Figure 1a The diagram shows the lever system of the first power module in a vehicle's hybrid system when it is in pure electric motor drive mode. Figure 1c yes Figure 1a The diagram shows the lever system of the first power module in the hybrid drive mode of the vehicle's hybrid system.

[0060] Figure 2a This is a schematic diagram showing the topology of a hybrid power system for vehicles according to a second embodiment of the present invention. Figure 2b yes Figure 2a The diagram shows the lever system of the first power module in a vehicle's hybrid system when it is in pure electric motor drive mode. Figure 2c yes Figure 2a The diagram shows the lever system of the first power module in the hybrid drive mode of the vehicle's hybrid system.

[0061] Explanation of reference numerals in the attached figures

[0062] ICE engine TM1 First motor TM2 Second motor C Clutch SU Sun gear PG Planetary gear P Planetary gear carrier R Ring gear G1, G2, G3 Gears DM1 First differential DM2 Second differential W1 One pair of wheels W2 Another pair of wheels. Detailed Implementation

[0063] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement the present invention, and are not intended to exhaustively describe all possible ways of the invention, nor to limit the scope of the invention.

[0064] In this invention, "transmission connection" refers to a connection between two components that can transmit torque. Unless otherwise specified, it means that the two components are directly connected or indirectly connected via an existing transmission mechanism.

[0065] The structure and operating mode of the hybrid power system for vehicles according to the first embodiment of the present invention will be described below.

[0066] (Structure and operating mode of a hybrid power system for vehicles according to a first embodiment of the present invention)

[0067] like Figure 1a As shown, a hybrid power system for vehicles according to a first embodiment of the present invention includes a first power module (power split module) corresponding to a pair of wheels W1 (e.g., a pair of front wheels) of the vehicle and a second power module (electric axle module) corresponding to another pair of wheels W2 (e.g., a pair of rear wheels) of the vehicle, such that the first power module can drive the pair of wheels W1 and the second power module can drive the other pair of wheels W2, and the two power modules can work independently or work together.

[0068] The first power module includes an engine ICE, a first motor TM1, a planetary gear mechanism, a first differential DM1, and a gear G1.

[0069] In this embodiment, the output shaft of the engine ICE is coaxially and torsionally connected to the planetary gear carrier P of the planetary gear mechanism, ensuring a constant transmission connection between the engine ICE and the planetary gear mechanism. This allows the engine ICE to transmit torque to or receive torque from the planetary gear mechanism via the planetary gear carrier P. Specifically, the engine ICE can be connected to the planetary gear carrier P via, for example, a damping mechanism (not shown in the figure) consisting of a dual-mass flywheel.

[0070] In this embodiment, the input / output shaft of the first motor TM1 is directly connected to the sun gear SU of the planetary gear mechanism in a coaxial and torsion-resistant manner, ensuring a constant transmission connection between the first motor TM1 and the planetary gear mechanism, thereby enabling bidirectional torque transmission. When the first motor TM1 is powered by a battery (not shown), it transmits torque to the sun gear SU of the planetary gear mechanism as a motor. When the first motor TM1 receives torque from the sun gear SU of the planetary gear mechanism, it acts as a generator to charge the battery.

[0071] In this embodiment, the planetary gear mechanism includes a sun gear SU, multiple planet gears PG, a planet carrier P, and a ring gear R. As described above, the sun gear SU is directly connected to the input / output shaft of the first motor TM1 in a coaxial and torsion-resistant manner. The multiple planet gears PG are located radially outside the sun gear SU and are evenly distributed along the circumference of the sun gear SU. The multiple planet gears PG are always meshed with the sun gear SU and are all mounted on the planet carrier P, so that the multiple planet gears PG can rotate on their own axis while revolving around the sun gear SU under the holding of the planet carrier P. As described above, the planet carrier P is connected to the output shaft of the engine ICE in a coaxial and torsion-resistant manner. The ring gear R is located radially outside the multiple planet gears PG. The internal teeth of the ring gear R are always meshed with the multiple planet gears PG, and the external teeth of the ring gear R are always meshed with gear G1. Gear G1 is the input gear of the first differential DM1. The differential DM1 is also always connected to a pair of wheels W1 through two half-shafts.

[0072] In this embodiment, the first differential DM1 can be any existing differential such as a bevel gear differential.

[0073] Furthermore, the second power module includes a second motor TM2, a second differential DM2, and two gears G2 and G3.

[0074] In this embodiment, gear G2 is mounted on the input / output shaft of the second motor TM2 in an anti-torsional manner. Gear G3 is the input gear of the second differential DM2, and gear G3 and gear G2 are always meshed. The second differential DM2 is always connected to the other pair of wheels W2 via two half-shafts. Thus, when the second motor TM2 is powered by a battery (not shown), the second motor TM2, as a motor, transmits torque to the other pair of wheels W2 via the gear pair (first-stage reduction mechanism) formed by gears G2 and G3 and the second differential DM2. When the second motor TM2 receives torque from the other pair of wheels W2 via the second differential DM2, the second motor TM2 acts as a generator to charge the battery.

[0075] The specific structure of the hybrid power system for vehicles according to the first embodiment of the present invention has been described in detail above. The operating mode of the hybrid power system for vehicles will be illustrated below by example.

[0076] The hybrid vehicle system according to the first embodiment of the present invention further includes a control module capable of controlling the hybrid vehicle system to enable the vehicle to achieve part-time four-wheel drive, that is, to enable the vehicle to achieve two-wheel drive and four-wheel drive as needed. In the two-wheel drive and four-wheel drive operating modes, the hybrid vehicle system can also achieve pure electric motor drive or hybrid drive as needed.

[0077] Table 1 below shows the power modes and operating modes of a hybrid power system for vehicles according to a first embodiment of the present invention.

[0078] Table 1

[0079]

[0080] In Table 1, "Driving Power Range" and "Speed ​​Range" indicate the conditions under which the vehicle's hybrid system operates. Furthermore, the "Driving Power Range" in Table 1 can be determined as "Low / Medium / High" by sensing the depth of the driver's accelerator pedal press using sensors; the "Speed ​​Range" can be determined as "Low / Medium / High" by comparing the vehicle's current speed with multiple predetermined values. For example, speeds less than or equal to a first predetermined value are defined as "Low," speeds greater than the first predetermined value but less than or equal to a second predetermined value are defined as "Medium," and speeds greater than the second predetermined value are defined as "High."

[0081] Combining Table 1 above and Figures 1a to 1c (in Figure 1b and Figure 1c The diagram illustrates the lever system of the first power module in different driving modes of a vehicle's hybrid power system. It displays parameters such as the transmission ratio of the planetary gear mechanism of the first power module using a lever method. Further details are provided. Figure 1a The conditions that the torque and speed parameters of the main components of the hybrid power system in the vehicle must meet will be explained in more detail.

[0082] When the vehicle uses a hybrid power system to put the vehicle in two-wheel drive mode and the second power module transmits torque to the other pair of wheels W2 for driving, the vehicle uses a hybrid power system in pure electric motor drive mode, satisfying the following formula.

[0083] T Output =0,

[0084] T ICE =0,

[0085] T M1 =0,

[0086]

[0087] n ICE =0,

[0088] n M1 =-n Output *i g ,and

[0089]

[0090]

[0091] Where T Output This is the torque output from the gear ring R, measured in Nm (Newton-meter); T ICE This refers to the specified torque of the engine's ICE (Internal Circuit), measured in Nm; T M1 This is the specified torque of the first motor TM1, in Nm; T M2 This is the specified torque of the second motor TM2, in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, measured in Nm; n Output This refers to the rotational speed of the gear ring R, measured in rpm (revolutions per minute); n Whl It is the rotational speed of a pair of wheels W1, in rpm; n ICE This refers to the engine's ICE speed, measured in rpm; n M1 This is the rotational speed of the first motor TM1, in rpm; n M2 This refers to the rotational speed of the second motor TM2, in rpm; i g It is the ratio of the number of internal teeth of the gear ring R to the number of teeth of the sun gear SU; Whl2Output It is the transmission ratio from a pair of wheels W1 to the gear ring R; i Whl2M2 It is the transmission ratio from the other pair of wheels W2 to the second motor TM2.

[0092] When the vehicle's hybrid system is in two-wheel drive mode and the first power module transmits torque to a pair of wheels W1 for driving, or when the vehicle's hybrid system is in four-wheel drive mode and both power modules are used for driving simultaneously, the vehicle's hybrid system is in hybrid drive mode, and the following formula is satisfied in all the above cases:

[0093] T Output =T Output_req ,

[0094]

[0095]

[0096]

[0097] n ICE =n ICE_hybStrategy ,

[0098] n M1 =n ICE *(1+i g )-n Output *i g ,and

[0099]

[0100]

[0101] Where T Output T is the torque output from the gear ring R, measured in Nm. Output_req It is the output torque required by the first power module determined by the vehicle using hybrid strategies (such as accelerator pedal position and pedal reference table), measured in Nm; T ICE This refers to the specified torque of the engine's ICE (Internal Circuit), measured in Nm; T M1 This is the specified torque of the first motor TM1, in Nm; T M2 This is the specified torque of the second motor TM2, in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, determined using hybrid strategies (such as accelerator pedal position and pedal reference tables), expressed in Nm; Output This is the rotational speed of the gear ring R, measured in rpm; n Whl It is the rotational speed of a pair of wheels W1, in rpm; n ICE This refers to the engine's ICE speed, measured in rpm; n ICE_hybStrategy This refers to the target engine ICE speed determined by the vehicle, in rpm; n M1 This is the rotational speed of the first motor TM1, in rpm; n M2 This refers to the rotational speed of the second motor TM2, in rpm; i g It is the ratio of the number of internal teeth of the gear ring R to the number of teeth of the sun gear SU; Whl2Output It is the transmission ratio from a pair of wheels W1 to the gear ring R; i Whl2M2 It is the transmission ratio from the other pair of wheels W2 to the second motor TM2.

[0102] (Structure and operating mode of a hybrid power system for vehicles according to a second embodiment of the present invention)

[0103] like Figure 2a As shown, the basic structure of the hybrid power system for vehicles according to the second embodiment of the present invention is substantially the same as that of the hybrid power system for vehicles according to the first embodiment of the present invention. The difference lies in that the first power module of the hybrid power system according to the second embodiment of the present invention includes a clutch C, which includes only one clutch unit. The clutch C is disposed between the transmission housing and the planetary gear carrier P of the planetary gear mechanism, such that when the clutch C is engaged, the planetary gear carrier P cannot rotate relative to the transmission housing, and when the clutch C is disengaged, the planetary gear carrier P is allowed to rotate relative to the transmission housing.

[0104] The hybrid vehicle system according to a second embodiment of the present invention further includes a control module capable of controlling the hybrid vehicle system to enable the vehicle to achieve part-time four-wheel drive, that is, to enable the vehicle to achieve two-wheel drive and four-wheel drive as needed. In two-wheel drive and four-wheel drive modes, the hybrid vehicle system can also achieve pure electric motor drive and hybrid drive.

[0105] Table 2 below shows the power modes and operating modes of a hybrid power system for vehicles according to a second embodiment of the present invention.

[0106] Table 2

[0107]

[0108]

[0109] In Table 2, "Battery State of Charge," "Driving Power Range," and "Speed ​​Range" indicate the conditions under which the vehicle's hybrid system operates. Furthermore, the "Battery State of Charge" in Table 2 can be obtained by sensing the state of charge of the vehicle's battery using sensors; the "Driving Power Range" can be determined as "Low / Medium / High" by sensing the depth of the driver's accelerator pedal press using sensors; and the "Speed ​​Range" can be determined as "Low / Medium / High" by comparing the vehicle's current speed with a predetermined value.

[0110] Combining Table 2 above and Figures 2a to 2c (in Figure 2b and Figure 2c The diagram illustrates the lever system of the first power module in different driving modes of a vehicle's hybrid power system. It displays parameters such as the transmission ratio of the planetary gear mechanism of the first power module using a lever method. Further details are provided. Figure 2a The conditions that the torque and speed parameters of the main components of the hybrid power system in the vehicle must meet will be explained in more detail.

[0111] When the vehicle's hybrid system is in two-wheel drive mode and clutch C is engaged, the second power module drives the vehicle, and the hybrid system operates in a first pure electric motor drive mode. When the vehicle's hybrid system is in four-wheel drive mode and clutch C is engaged, both the first and second power modules drive the vehicle, and the hybrid system operates in a second pure electric motor drive mode. When the vehicle's hybrid system is in two-wheel drive mode and clutch C is disengaged, the first power module drives the vehicle, and the hybrid system operates in a first hybrid drive mode. When the vehicle's hybrid system is in four-wheel drive mode and clutch C is disengaged, both the first and second power modules drive the vehicle, and the hybrid system operates in a second hybrid drive mode.

[0112] When the vehicle's hybrid system is in the first pure electric motor drive mode and the second pure electric motor drive mode, the following formula is satisfied.

[0113] T Output =T Output_req ,

[0114] T ICE =0,

[0115]

[0116]

[0117] n ICE =0,

[0118] n M1 =-n Output *i g ,and

[0119]

[0120]

[0121] Where T Output T is the torque output from the gear ring R, measured in Nm. Output_req It is the output torque required by the first power module determined by the vehicle using hybrid strategies (such as accelerator pedal position and pedal reference table), measured in Nm; T ICE This refers to the specified torque of the engine's ICE (Internal Circuit), measured in Nm; T M1 This is the specified torque of the first motor TM1, in Nm; T M2 This is the specified torque of the second motor TM2, in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, determined using hybrid strategies (such as accelerator pedal position and pedal reference tables), expressed in Nm; Output This is the rotational speed of the gear ring R, measured in rpm; n Whl It is the rotational speed of a pair of wheels W1, in rpm; n ICE This refers to the engine's ICE speed, measured in rpm; n M1 This is the rotational speed of the first motor TM1, in rpm; n M2 This refers to the rotational speed of the second motor TM2, in rpm; i g It is the ratio of the number of internal teeth of the gear ring R to the number of teeth of the sun gear SU; Whl2Output It is the transmission ratio from a pair of wheels W1 to the gear ring R; i Whl2M2 It is the transmission ratio from the other pair of wheels W2 to the second motor TM2.

[0122] When the vehicle's hybrid system is in the first hybrid drive mode and the second hybrid drive mode mentioned above, the following conditions are met:

[0123] T Output =T Output_req ,

[0124]

[0125]

[0126]

[0127] n ICE =n ICE_hybStrategy ,

[0128] n M1 =n ICE *(1+i g )-n Output *i g ,and

[0129]

[0130]

[0131] Where T Output T is the torque output from the gear ring R, measured in Nm. Output_req It is the output torque required by the first power module determined by the vehicle using hybrid strategies (such as accelerator pedal position and pedal reference table), measured in Nm; T ICE This refers to the specified torque of the engine's ICE (Internal Circuit), measured in Nm; T M1 This is the specified torque of the first motor TM1, in Nm; T M2 This is the specified torque of the second motor TM2, in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, determined using hybrid strategies (such as accelerator pedal position and pedal reference tables), expressed in Nm; Output This is the rotational speed of the gear ring R, measured in rpm; n Whl It is the rotational speed of a pair of wheels W1, in rpm; n ICE This refers to the engine's ICE speed, measured in rpm; n ICE_hybStrategy This refers to the target engine ICE speed determined by the vehicle, in rpm; n M1 This is the rotational speed of the first motor TM1, in rpm; n M2 This refers to the rotational speed of the second motor TM2, in rpm; i g It is the ratio of the number of internal teeth of the gear ring R to the number of teeth of the sun gear SU; Whl2OutputIt is the transmission ratio from a pair of wheels W1 to the gear ring R; i Whl2M2 It is the transmission ratio from the other pair of wheels W2 to the second motor TM2.

[0132] Furthermore, the present invention also provides a vehicle including a hybrid power system for vehicles having the above structure.

[0133] In summary, although the specific technical solutions of the present invention have been illustrated in the above specific embodiments, the present invention is not limited to the examples listed in the above specific embodiments, and the following supplementary explanations are provided.

[0134] (i) In addition to the driving modes and operating modes of the hybrid vehicle system according to the present invention described above, the hybrid vehicle system according to the present invention can realize all operating modes of conventional power-split hybrid systems such as Toyota's THS power-split hybrid system, and has good fuel consumption performance.

[0135] Furthermore, the hybrid power system for vehicles according to the present invention enables part-time four-wheel drive when driving the vehicle. This allows for flexible allocation of wheel drive torque output between the front and rear wheels, enabling the free allocation of output torque between the front and rear wheels according to the specific driving scenarios required for different purposes (e.g., fuel economy, sport driving, or off-road driving). The hybrid power system for vehicles according to the present invention provides the vehicle with better acceleration performance, maximum climbing energy, and off-road capability.

[0136] (ii) The hybrid power system for vehicles according to the second embodiment of the present invention can also be used in plug-in hybrid electric vehicles.

[0137] (iii) In hybrid drive mode, the hybrid system for vehicles according to the present invention can simultaneously recover braking energy from both the front and rear wheels. This recovers more energy than conventional technologies that recover braking energy from only one pair of wheels.

[0138] (iv) Although the above specific embodiments have described that the first power module (power split module) corresponds to a pair of front wheels and the second power module (electric axle module) corresponds to a pair of rear wheels, the present invention is not limited thereto. The positions of the first power module (power split module) and the second power module (electric axle module) can be interchanged.

Claims

1. A hybrid power system for a vehicle, the hybrid power system for a vehicle comprising a first power module and a second power module, The first power module includes an engine (ICE), a first electric motor (TM1), a planetary gear mechanism, a first differential (DM1), and a clutch (C). The planetary gear mechanism includes a sun gear (SU), multiple planet gears (PG), a planet carrier (P), and a ring gear (R). The sun gear (SU) is always driven by the first electric motor (TM1), the planet carrier (P) is always driven by the engine (ICE), and the ring gear (R) is always driven by a pair of wheels (W1) of the vehicle via the first differential (DM1). The clutch (C) is located in the transmission housing and the planet carrier (P) such that when the clutch (C) is engaged, the planet carrier (P) cannot rotate, and when the clutch (C) is disengaged, the planet carrier (P) is allowed to rotate. Thus, when the clutch (C) is engaged, the vehicle's hybrid system is in pure electric motor drive mode; when the clutch (C) is disengaged, the vehicle's hybrid system is in hybrid drive mode. The second power module includes a second motor (TM2) and a second differential (DM2), the second motor (TM2) being always connected to the other pair of wheels (W2) of the vehicle via the second differential (DM2).

2. The hybrid power system for vehicles according to claim 1, characterized in that, The first power module also includes an input gear (G1) for a first differential (DM1), the gear ring (R) having external teeth, the gear ring (R) meshing with the input gear (G1) via the external teeth, thereby drivingly connecting with the first differential (DM1); and / or The second motor (TM2) is connected to the second differential (DM2) via a first-stage reduction mechanism formed by gear pairs (G2, G3).

3. The hybrid power system for vehicles according to claim 1 or 2, characterized in that, The vehicle hybrid system also includes a control module, which is capable of controlling the vehicle hybrid system to enable the vehicle to achieve two-wheel drive mode and four-wheel drive mode. When the vehicle hybrid system puts the vehicle in the two-wheel drive mode, the first power module is used for driving and the vehicle hybrid system is in hybrid drive mode, or the second power module is used for driving and the vehicle hybrid system is in pure electric motor drive mode. When the vehicle hybrid system puts the vehicle in the four-wheel drive mode, the first power module and the second power module are used for driving and the vehicle hybrid system is in hybrid drive mode.

4. The hybrid power system for vehicles according to claim 3, characterized in that, When the vehicle's hybrid power system is in the hybrid drive mode, the following conditions are met: T Output =T Output_req , n ICE =n ICE_hybStrategy , n M1 = n ICE *(1+i g )-n Output *i g , and Where T Output This is the torque output from the gear ring (R), measured in Nm (Newton-meter). Output_req The output torque required by the first power module, as determined by the vehicle, is expressed in Nm; T ICE This is the specified torque of the engine (ICE), measured in Nm; T M1 This is the specified torque of the first motor (TM1), in Nm; T M2 This is the specified torque of the second motor (TM2), in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, measured in Nm; n Output This refers to the rotational speed of the gear ring (R), measured in rpm (revolutions per minute); n Whl n is the rotational speed of the pair of wheels (W1), in rpm; ICE This refers to the engine speed (ICE), measured in rpm; n ICE_hybStrategy n is the target engine speed (ICE) determined by the vehicle, in rpm; M1 This is the rotational speed of the first motor (TM1), in rpm; n M2 This refers to the rotational speed of the second motor (TM2), in rpm; i g It is the ratio of the number of internal teeth of the gear ring (R) to the number of teeth of the sun gear (SU); i Whl2Output It is the transmission ratio from the pair of wheels (W1) to the gear ring (R); i Whl2M2 It is the transmission ratio from the other pair of wheels (W2) to the second motor (TM2).

5. The hybrid power system for vehicles according to claim 3, characterized in that, When the hybrid power system of the vehicle is in the pure electric motor drive mode, the following conditions are met: T Output ＝0， T ICE ＝0， T M1 ＝0， n ICE ＝0， n M1 = -n Output *i g , and Where T Output This is the torque output from the gear ring (R), measured in Nm (Newton-meter). ICE This is the specified torque of the engine (ICE), measured in Nm; T M1 This is the specified torque of the first motor (TM1), in Nm; T M2 This is the specified torque of the second motor (TM2), in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, measured in Nm; n Output This refers to the rotational speed of the gear ring (R), measured in rpm (revolutions per minute); n Whl n is the rotational speed of the pair of wheels (W1), in rpm; ICE This refers to the engine speed (ICE), measured in rpm; n M1 This is the rotational speed of the first motor (TM1), in rpm; n M2 This refers to the rotational speed of the second motor (TM2), in rpm; i g It is the ratio of the number of internal teeth of the gear ring (R) to the number of teeth of the sun gear (SU); i Whl2Output It is the transmission ratio from the pair of wheels (W1) to the gear ring (R); i Whl2M2 It is the transmission ratio from the other pair of wheels (W2) to the second motor (TM2).

6. The hybrid power system for vehicles according to claim 1 or 2, characterized in that, The vehicle hybrid system also includes a control module, which is capable of controlling the vehicle hybrid system to enable the vehicle to achieve two-wheel drive mode and four-wheel drive mode. When the vehicle hybrid system puts the vehicle in the two-wheel drive mode and the clutch (C) is engaged, the second power module drives the vehicle and the vehicle hybrid system is in pure electric motor drive mode; when the vehicle hybrid system is in the two-wheel drive mode and the clutch (C) is disengaged, the first power module drives the vehicle and the vehicle hybrid system is in hybrid drive mode, and When the vehicle hybrid system puts the vehicle in the four-wheel drive mode and the clutch (C) is engaged, the first power module and the second power module are used for driving and the vehicle hybrid system is in pure electric motor drive mode; when the vehicle hybrid system puts the vehicle in the four-wheel drive mode and the clutch (C) is disengaged, the first power module and the second power module are used for driving and the vehicle hybrid system is in hybrid drive mode.

7. The hybrid power system for vehicles according to claim 6, characterized in that, When the hybrid power system of the vehicle is in the pure electric motor drive mode, the following conditions are met: T Output =T Output_req , T ICE ＝0， n ICE ＝0， n M1 = -n Output *i g , and Where T Output This is the torque output from the gear ring (R), measured in Nm (Newton-meter). Output_req The output torque required by the first power module, as determined by the vehicle, is expressed in Nm; T ICE This is the specified torque of the engine (ICE), measured in Nm; T M1 This is the specified torque of the first motor (TM1), in Nm; T M2 This is the specified torque of the second motor (TM2), in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, measured in Nm; n Output This refers to the rotational speed of the gear ring (R), measured in rpm (revolutions per minute); n Whl n is the rotational speed of the pair of wheels (W1), in rpm; ICE This refers to the engine speed (ICE), measured in rpm; n M1 This is the rotational speed of the first motor (TM1), in rpm; n M2 This refers to the rotational speed of the second motor (TM2), in rpm; i g It is the ratio of the number of internal teeth of the gear ring (R) to the number of teeth of the sun gear (SU); i Whl2Output It is the transmission ratio from the pair of wheels (W1) to the gear ring (R); i Whl2M2 It is the transmission ratio from the other pair of wheels (W2) to the second motor (TM2).

8. The hybrid power system for vehicles according to claim 6, characterized in that, When the vehicle's hybrid power system is in the hybrid drive mode, the following conditions are met: T Output =T Output_req , n ICE =n ICE_hybStrategy , n M1 = n ICE *(1+i g )-n Output *i g , and Where T Output This is the torque output from the gear ring (R), measured in Nm (Newton-meter). Output_req The output torque required by the first power module, as determined by the vehicle, is expressed in Nm; T ICE This is the specified torque of the engine (ICE), measured in Nm; T M1 This is the specified torque of the first motor (TM1), in Nm; T M2 This is the specified torque of the second motor (TM2), in Nm; T WhlDrvReq This is the total wheel-side output torque required by the vehicle, measured in Nm; n Output This refers to the rotational speed of the gear ring (R), measured in rpm (revolutions per minute); n Whl n is the rotational speed of the pair of wheels (W1), in rpm; ICE This refers to the engine speed (ICE), measured in rpm; n ICE_hybStrategy n is the target engine speed (ICE) determined by the vehicle, in rpm; M1 This is the rotational speed of the first motor (TM1), in rpm; n M2 This refers to the rotational speed of the second motor (TM2), in rpm; i g It is the ratio of the number of internal teeth of the gear ring (R) to the number of teeth of the sun gear (SU); i Whl2Output It is the transmission ratio from the pair of wheels (W1) to the gear ring (R); i Whl2M2 It is the transmission ratio from the other pair of wheels (W2) to the second motor (TM2).

9. A vehicle comprising a hybrid power system for a vehicle according to any one of claims 1 to 8.

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