Hybrid power transmission system for agricultural machines and driving method

Abstract

The application discloses a kind of hybrid power transmission system and driving method for agricultural machinery, belong to agricultural machinery driving technical field, including vehicle controller, vehicle controller is connected with internal combustion engine controller, front motor controller, rear motor controller, transmission controller and battery controller;Internal combustion engine controller is connected with internal combustion engine, internal combustion engine is connected with mechanical coupling transmission system, differential transmission mechanism is connected with mechanical coupling transmission system, power is transmitted to driving wheel, front motor controller and rear motor controller are connected with front motor and rear motor respectively, and front motor and rear motor are connected with mechanical coupling transmission system, transmission controller is directly connected with mechanical coupling transmission system, battery controller is connected with battery pack, and battery pack is connected with front motor and rear motor respectively.The driving mode of internal combustion engine+motor is used, always fixes the working point of internal combustion engine in the preferred working area, improves the power performance and fuel economy of power assembly.

Description

Technical Field

[0001] This invention belongs to the field of agricultural machinery drive technology, specifically relating to a hybrid power transmission system and drive method for agricultural machinery. Background Technology

[0002] As a major agricultural country, my country has one of the largest arable land areas in the world, but its level of agricultural automation is relatively low. This is mainly due to the low level of automation in agricultural machinery. Agricultural tractors, as the mainstay of agricultural machinery, have significant characteristics such as complex operating conditions, poor working environment, and low driving speed. At present, most large agricultural tractors at home and abroad use an internal combustion engine + hydrostatic drive unit powertrain for driving. When driving at low speed and high load, the hydrostatic unit is used for torque conversion. When driving at medium and high speed, the hydrostatic unit and the internal combustion engine are coupled for driving. When driving at constant speed, the engine direct drive mode can be used. Although the hydrostatic unit has torque conversion capabilities, it has low efficiency, high energy consumption, and poor emissions, resulting in a great waste of energy.

[0003] The maturity of new energy drive systems in agricultural machinery is relatively low. Among existing technologies, patent CN106427525A discloses a novel diesel-electric hybrid tractor that uses a series connection between an internal combustion engine and a hub motor. The hub motor directly drives the vehicle, while the engine is only used for charging and driving the power take-off device. This simplifies the transmission structure, but it cannot achieve parallel drive of the engine and motor to the drive wheels, nor can it achieve multi-speed and torque coupling, resulting in low efficiency. Furthermore, the output torque and speed range are limited by the motor's parameters, preventing the provision of multiple operating modes and making it unsuitable for the complex operating scenarios of agricultural machinery. Additionally, the hub motor requires high integration and is costly. While hybrid drive systems are relatively mature in the passenger car sector, the working characteristics of agricultural machinery differ significantly from those of passenger cars. Therefore, there is an urgent need for a hybrid drive system suitable for agricultural tractors. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a hybrid power transmission system and driving method for agricultural machinery, so as to solve the technical problem of the lack of a hybrid power drive system suitable for agricultural tractors in the prior art.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A hybrid power transmission system for agricultural machinery includes a vehicle controller connected to an internal combustion engine controller, a front motor controller, a rear motor controller, a transmission controller, and a battery controller. The internal combustion engine controller is connected to an internal combustion engine, which is connected to a mechanical coupling transmission system. The output end of the mechanical coupling transmission system is connected to a differential transmission mechanism, which transmits power to the drive wheels via half-shafts. The front motor controller and the rear motor controller are respectively connected to a front motor and a rear motor, both of which are connected to the mechanical coupling transmission system. The transmission controller is directly connected to the mechanical coupling transmission system. The battery controller is connected to a battery pack, which is connected to both the front motor and the rear motor.

[0007] Preferably, the mechanically coupled transmission system includes: an engine input end, a first planetary gear set, a second planetary gear set, a C1 clutch, a C2 clutch, a B1 brake, a B2 brake, and an output shaft;

[0008] The front motor is connected to the first planetary gear set, the engine input end is connected to the first planetary gear set, the first planetary gear set is connected to the C1 clutch, the C1 clutch is connected to the C2 clutch and the B1 brake, the C1 clutch and the C2 clutch are connected to the second planetary gear set, the rear motor is connected to the C2 clutch and the second planetary gear set respectively, and the second planetary gear set is connected to the output shaft.

[0009] Preferably, the first planetary gear set includes a first sun gear, a first planet gear, a first planet carrier, and a first ring gear; the front motor is fixedly connected to the first sun gear, one side of the first sun gear meshes with the first planet gear, the first planet gear also meshes with the first ring gear, the first ring gear is fixed on the transmission housing, and the first planet carrier is disposed on the first planet gear and connected to the input shaft and the C1 clutch respectively.

[0010] Preferably, the second planetary gear set includes a second sun gear, a second planet gear, a second planet carrier, and a second ring gear; the second sun gear is fixedly connected to the rear motor and the C2 clutch, the second planet gear meshes with the second sun gear and the second ring gear respectively, the second ring gear is fixedly connected to the C1 clutch and the C2 clutch, and the second planet carrier is mounted on the second planet gear and connected to the output shaft.

[0011] Preferably, the C1 clutch and the C2 clutch each include a C1 clutch drive end, a C1 clutch driven end, a C2 clutch drive end, and a C2 clutch driven end; the engine input end is fixedly connected to the first planetary carrier and the drive end of the C1 clutch; the B1 brake is fixedly connected to the C1 clutch driven end, the C2 clutch drive end, and the second planetary gear set; and the rear motor is fixedly connected to the C2 clutch driven end.

[0012] Preferably, the front motor and the rear motor each include: a front motor stator, a front motor rotor, a rear motor stator, and a rear motor rotor; the B1 brake and the B2 brake each include: a B1 brake fixed end, a B1 brake rotating end, a B2 brake fixed end, and a B2 brake fixed end; the first gear ring, the B1 brake fixed end, the B2 brake fixed end, the front motor stator, and the rear motor stator are fixedly connected to the transmission housing 17, with zero degrees of freedom.

[0013] Preferably, the vehicle controller is used to read the working status of each module from the internal combustion engine controller, front motor controller, rear motor controller, transmission controller, battery controller, etc., and then issue instructions to each controller according to the vehicle computer.

[0014] This invention also discloses a driving method for a hybrid power transmission system for agricultural machinery. The mechanically coupled transmission system includes: an engine input end, a first planetary gear set, a second planetary gear set, a C1 clutch, a C2 clutch, a B1 brake, a B2 brake, and an output shaft; and includes the following steps:

[0015] S101, power on;

[0016] S102, determine if there is a drive signal. If the system does not send a drive signal, proceed to S103; otherwise, proceed to S106.

[0017] S103, first determine whether the current SOC value of the battery pack is greater than the battery pack's minimum charging SOC value. charge If SOC ≥ SOC charge If the condition is met, proceed to S104; otherwise, proceed to S105.

[0018] S104, clutch C1 disengages, brakes B1 and B2 are locked, and parking mode is activated;

[0019] S105, start the engine and enter parking charging mode;

[0020] S106, determine whether the current SOC value of the battery pack is greater than the minimum SOC value allowed for pure electric driving. EV If SOC ≥ SOC EV If yes, proceed to S107; otherwise, proceed to S110.

[0021] S107, Enter EV mode, the vehicle control system calculates the current driving torque T required by the vehicle. NEED This information is then sent to the transmission controller, along with the shift threshold for pure electric mode. To make a comparison, if If the condition is not met, proceed to S108; otherwise, proceed to S109.

[0022] S108, B1 brake engages, executing motor deceleration drive mode;

[0023] S109, C2 clutch locked, direct motor drive mode executed;

[0024] S110, compares the battery pack's SOC value with the minimum SOC value in HEV mode. HEV For comparison, if SOC ≥ SOC HEV If yes, proceed to S111; otherwise, proceed to S115.

[0025] S111, Enter HEV mode, the vehicle control system calculates the current driving torque T required by the vehicle. NEED And send it to the transmission controller, along with the shift threshold for HEV mode. To make a comparison, if Then proceed to S113; otherwise proceed to S114.

[0026] S113, execute torque coupling mode;

[0027] S114, execute speed coupling mode;

[0028] S115, enter internal combustion engine drive mode, determine whether coasting start or creeping is needed based on the current vehicle speed, if V P <V launch If yes, proceed to S116; otherwise, proceed to S117.

[0029] S116, execute ICE start-up coasting or crawling;

[0030] S117, Enter ICE mode, the vehicle control system calculates the current driving torque T required by the vehicle. NEED And send it to the transmission controller, along with the shift threshold for ICE mode. To make a comparison, if Then proceed to S118; otherwise proceed to S119.

[0031] S118, Execute engine deceleration drive mode;

[0032] S119, execute engine direct drive mode;

[0033] S120, vehicle operating mode determination completed.

[0034] Preferably, in HEV mode and internal combustion engine drive mode, the internal combustion engine can directly charge the battery pack through the first planetary gear set and the front motor.

[0035] Preferably, during pure electric driving, if the SOC value of the battery pack is lower than the product of the minimum allowable value for pure electric driving and the safety factor λ, then... EV·λ, i.e., SOC <SOC EV ·λ, then the engine is started by the front motor, and the battery pack is charged by the front motor to achieve extended range driving.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] First, the present invention adopts a drive mode of internal combustion engine + electric motor, which always keeps the working point of internal combustion engine in the optimal working range, thereby improving the power and fuel economy of the powertrain.

[0038] Secondly, the present invention adopts an internal combustion engine + dual motors + planetary gear set structure, which can realize multiple working modes such as pure electric, engine direct drive hybrid, range-extended hybrid, internal combustion engine drive, speed coupling drive and torque coupling drive. It has strong adaptability to the complex working environment of agricultural machinery, obvious energy-saving effect and is not highly integrated.

[0039] Third, in the speed coupling mode, the speed is adjusted by changing the speed of the rear motor. While achieving direct drive of the engine, the engine speed can always be controlled in the high-efficiency range, which improves the fuel economy of agricultural machinery.

[0040] Fourth, during pure electric driving using the rear-mounted motor, the engine can be started independently using the front-mounted motor. At this time, the C1 clutch is disengaged, and the engine start-up is not rigidly connected to the entire transmission system, resulting in no impact on the driving process and ensuring smooth driving. Attached Figure Description

[0041] Figure 1 This is a structural diagram of the hybrid power transmission system for agricultural machinery of the present invention;

[0042] Figure 2 This is a hybrid power transmission route diagram for agricultural machinery according to the present invention;

[0043] Figure 3 This is a schematic diagram of the control of the hybrid power transmission system for agricultural machinery of the present invention.

[0044] Wherein: 1-Front motor; 1a-Front motor stator; 1b-Front motor rotor; 2-B1 First brake; 2a-B1 brake fixed end; 2b-B1 brake rotating end; 3-B2 Second brake; 3a-B2 brake fixed end; 3b-B2 brake rotating end; 4-Rear motor; 4a-Rear motor stator; 4b-Rear motor rotor; 5-Second planetary carrier; 6-Second ring gear; 7-Second planetary gear; 8-Output shaft; 9-Second sun gear; 10-C2 clutch; 10a-C2 clutch drive end; 10b-C2 clutch engaged. Driven end of the transmission; 11-C1 clutch; 11a-C1 clutch drive end; 11b-C1 clutch driven end; 12-First planetary gear; 13-First sun gear; 14-Input shaft; 15-First planetary carrier; 16-First ring gear; 17-Transmission housing; 201-Vehicle controller; 202-Internal combustion engine controller; 203-Front motor controller; 204-Rear motor controller; 205-Transmission controller; 206-Battery controller; 207-Battery pack; 208-Internal combustion engine; 209-Drive wheel; 210-Differential / transmission mechanism. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] The present invention will now be described in further detail with reference to the accompanying drawings:

[0048] See Figure 1The hybrid power transmission system for agricultural machinery disclosed in this application includes a vehicle controller 201, which is connected to an internal combustion engine controller 202, a front motor controller 203, a rear motor controller 204, a transmission controller 205, and a battery controller 206. The internal combustion engine controller 202 is connected to an internal combustion engine 208, which is connected to a mechanical coupling transmission system 211. The output end of the mechanical coupling transmission system 211 is connected to a differential transmission mechanism 210, which transmits power to the drive wheels 209 through half-shafts. The front motor controller 203 and the rear motor controller 204 are respectively connected to a front motor 1 and a rear motor 4. Both the front motor 1 and the rear motor 4 are connected to the mechanical coupling transmission system 211. The transmission controller 205 is directly connected to the mechanical coupling transmission system 211. The battery controller 206 is connected to a battery pack 207, which is connected to the front motor 1 and the rear motor 4.

[0049] In some embodiments, the internal combustion engine 208 is connected to the mechanically coupled transmission system 211, and power is directly transmitted to the mechanically coupled transmission system.

[0050] In some embodiments, the output end of the mechanically coupled transmission system 211 is connected to the main reducer or the speed change mechanism 210, and transmits power to the drive wheel 209 through the half shaft;

[0051] In some embodiments, the vehicle controller 201 reads the working status of each module from the internal combustion engine controller 202, the front motor controller 203, the rear motor controller 204, the transmission controller 205, the battery controller 206, etc., and then issues instructions to each controller according to the vehicle computer.

[0052] In some embodiments, see Figure 2 The mechanical coupling transmission system 211 includes: an engine input end 14, a first planetary gear set 18, a second planetary gear set 19, a C1 clutch 11, a C2 clutch 10, a B1 brake 2, a B2 brake 3, and an output shaft 8.

[0053] The front motor 1 is connected to the first planetary gear set 18. The engine input end 14 is connected to the first planetary gear set 18. The first planetary gear set 18 is connected to the C1 clutch 11. The C1 clutch 11 is connected to the C2 clutch 10 and the B1 brake 2. The C1 clutch 11 and the C2 clutch 10 are connected to the second planetary gear set 19. The rear motor 4 is connected to the C2 clutch 10 and the second planetary gear set 19 respectively. The second planetary gear set 19 is connected to the output shaft 8.

[0054] In some embodiments, the first planetary gear set 18 includes a first sun gear 13, a first planet gear 12, a first planet carrier 15, and a first ring gear 16; the front motor 1 is fixedly connected to the first sun gear 13, one side of the first sun gear 13 meshes with the first planet gear 12, the first planet gear 12 also meshes with the first ring gear 16, the first ring gear 16 is fixed on the transmission housing 17, and the first planet carrier 15 is disposed on the first planet gear 12 and connected to the input shaft 14 and the C1 clutch 11 respectively.

[0055] In some embodiments, the second planetary gear set 19 includes a second sun gear 9, a second planet gear 7, a second planet carrier 5, and a second ring gear 6; the second sun gear 9 is fixedly connected to the rear motor 4 and the C2 clutch 10, the second planet gear 7 meshes with the second sun gear 9 and the second ring gear 6 respectively, the second ring gear 6 is fixedly connected to the C1 clutch 11 and the C2 clutch 10, and the second planet carrier 5 is disposed on the second planet gear 7 and connected to the output shaft 8.

[0056] In some embodiments, the C1 clutch 11 and the C2 clutch 10 respectively include a C1 clutch drive end 11a, a C1 clutch driven end 11b, a C2 clutch drive end 10a, and a C2 clutch driven end 10b; the engine input end 14 is fixedly connected to the first planetary carrier 15 and the C1 clutch drive end 11a; the B1 brake 2 is fixedly connected to the C1 clutch driven end 11b, the C2 clutch drive end 10a, and the second planetary gear set; and the rear motor 4 is fixedly connected to the C2 clutch driven end 10b.

[0057] In some embodiments, the front motor 1 and the rear motor 4 respectively include: a front motor stator 1a, a front motor rotor 1b, a rear motor stator 4a, and a rear motor rotor 4b; the B1 brake 2 and the B2 brake 3 respectively include: a B1 brake fixed end 2a, a B1 brake rotating end 2b, a B2 brake fixed end 3a, and a B2 brake fixed end 3b; the first gear ring 16, the B1 brake fixed end 2a, the B2 brake fixed end 3a, the front motor stator 1a, and the rear motor stator 4a are fixedly connected to the transmission housing 17, with zero degrees of freedom.

[0058] In some embodiments, the first planetary gear set 18 includes a first sun gear 13, a first planet gear 12, a first planet carrier 15, and a first ring gear 16. The second planetary gear set 19 includes a second sun gear 9, a second planet gear 7, a second planet carrier 5, and a second ring gear 6.

[0059] In some embodiments, the drive end 1b of the front motor 1 is fixedly connected to the first sun gear 13, the drive end 4b of the rear motor 4 is fixedly connected to the rotating end 3b of the B2 brake, the drive end 4b of the rear motor 4 is fixedly connected to the second sun gear 9, and the drive end 4b of the rear motor 4 is fixedly connected to the driven end 10b of the C2 clutch. The drive end 4b of the rear motor 4, the rotating end 3b of the B2 brake, the driven end 10b of the C2 clutch, and the second sun gear 9 all have the same rotational speed and torque at any time.

[0060] In some embodiments, the engine input end 14 and the first planetary carrier 15 and the drive end 11a of the C1 clutch are fixedly connected, and the output shaft 8 and the second planetary carrier 5 are fixedly connected.

[0061] In some embodiments, the rotating end 2b of brake B1, the driven end 11b of clutch C1, the driving end 10a of clutch C2, and the second gear ring 6 are fixedly connected, and the rotating end 2b of brake B1, the driven end 11b of clutch C1, the driving end 10a of clutch C2, and the second gear ring 6 have the same rotational speed and torque at any time.

[0062] In some embodiments, the first gear ring 16, the B1 brake fixing end 2a, the B2 brake fixing end 3a, the front motor stator 1a, the rear motor stator 4a, and the transmission housing 17 are fixedly connected, with a degree of freedom of 0.

[0063] In some embodiments, the front motor 1 mainly charges the battery pack 22, and the rear motor 4 is mainly used to drive the vehicle. In the regenerative braking mode, the rear motor 4 can also charge the battery pack 22.

[0064] like Figure 1 The hybrid power transmission system for agricultural machinery shown can achieve the following functions:

[0065] Motor start engine mode:

[0066] When clutch 11 is disengaged, the rotor 1a of the front motor 1 is driven by the electromagnetic force of the stator 1b of the front motor to rotate the engine input shaft 14, thereby increasing the speed of the internal combustion engine 21 to the set speed, and then the engine is ignited, completing the start-up process.

[0067] Parking (P) mode:

[0068] Clutch 11 is disengaged, brakes 2 and 3 are locked, the rotational speeds of the rotating ends 2b and 3b of brakes 1 and 2 are 0, thus the rotational speed of the second gear ring 6 fixed to the rotating end 2b of brake 1 is 0, the rotational speed of the second sun gear 9 fixed to the rotating end 3b of brake 2 is 0, thus controlling the rotational speed of the second planetary carrier 7 to 0, achieving a brief suspension of the vehicle without applying the parking brake.

[0069] Motor reduction drive mode:

[0070] The B1 brake 2 is engaged, and the torque transmission route is: B1 brake rotating end → C1 clutch driven end 11b → second gear ring 6, so that the second gear ring 6 has 0 degrees of rotational freedom. The power is output through the rear motor 4b → second sun gear 9 → second planet gear 7 → second planet carrier 5 → output shaft route, realizing speed reduction and torque increase transmission.

[0071] Direct motor drive mode:

[0072] When clutch C2 10 is locked, power is transmitted to the second planetary gear 7 via the rear motor rotor 4b → C2 clutch driven end 10b → C2 clutch drive end 10a → second gear ring 6. Another path is transmitted to the second planetary gear 7 via the rear motor rotor 4b → second sun gear 9. After the power is combined, it is output via the second planetary gear → second planetary carrier 5 → output shaft. In this mode, the speed of output shaft 8 is the same as the speed of rear motor 4, and the output torque of motor is the same as the output torque of output shaft, thus achieving direct drive.

[0073] Speed ​​coupling mode:

[0074] When clutch C1 11 is engaged, the power of the internal combustion engine is output through the internal combustion engine output shaft 21in → input shaft 14 → C1 clutch 11 → second ring gear 6 → second planetary gear 7 → second planetary carrier 5 → output shaft 8. The power of the rear-mounted motor is output through the second sun gear 9 → second planetary gear 7 → second planetary carrier 5 → output shaft 8. The power of the internal combustion engine and the power of the motor are coupled at the second planetary gear set, and the vehicle speed is adjusted by the speed regulation of the rear-mounted drive motor. The speed of the internal combustion engine always operates within a fixed range.

[0075] Torque coupling mode:

[0076] With clutches C1 11 and C2 10 engaged, the internal combustion engine outputs power via the internal combustion engine output shaft 21in → input shaft 14 → C1 clutch 11 → second ring gear 6 → second planetary gear 7 → second planetary carrier 5 → output shaft 8. The rear-mounted motor outputs power via the second sun gear 9 → second planetary gear 7 → second planetary carrier 5 → output shaft 8. Because clutch C2 10 is engaged, the internal combustion engine and the motor rotate at the same speed, and the torque is output in parallel, achieving torque coupling.

[0077] Internal combustion engine coasting start mode

[0078] When brake 3 is engaged, the second sun gear 9 has zero rotational freedom. Clutch 11 initiates slip motion. Power is output through the internal combustion engine output shaft 21in → input shaft 14 → clutch 11 → second ring gear 6 → second planetary gear 7 → second planetary carrier 5 → output shaft 8. Based on the characteristics of the single-row planetary carrier, starting or creeping is achieved.

[0079] Internal combustion engine reduction drive mode:

[0080] With clutch C1 11 engaged and brake B2 3 engaged, the second sun gear 9 has zero rotational degrees of freedom. Power is output through one path: internal combustion engine output shaft 21in → input shaft 14 → clutch C1 11 → second ring gear 6 → second planetary gear 7 → second planetary carrier 5 → output shaft 8. Based on the characteristics of a single-row planetary carrier, speed reduction transmission is achieved. The other path transmits power through internal combustion engine output shaft 21in → input shaft 14 → first planetary carrier 15 → first planetary gear 12 → first sun gear 13 → front motor rotor 1b to the front motor 1, driving the front motor 1 to rotate and charge the battery pack 22, thus achieving the charging function.

[0081] Direct drive mode of internal combustion engine:

[0082] Clutch C1 11 is engaged, and clutch C2 10 is engaged. Power is transmitted through two paths: one via the internal combustion engine output shaft 21in → input shaft 14 → clutch C1 11 → second ring gear 6 → second planetary gear 7, and the other via the internal combustion engine output shaft 21in → input shaft 14 → clutch C1 11 → clutch C2 10 → second sun gear 9 to the second planetary gear 7, causing the second sun gear 9 and second ring gear 6 to rotate at the same speed. The two power paths converge on the second planetary carrier 5 and are output through the output shaft 8. In addition, there is another power path that is transmitted through the internal combustion engine output shaft 21in → input shaft 14 → first planetary carrier 15 → first planetary gear 12 → first sun gear 13 → front motor rotor 1b to the front motor 1, driving the front motor 1 to rotate and thus charge the battery pack 22, achieving the charging function.

[0083] Charging mode:

[0084] Whether the charging mode is independent of the operation and the working state of the clutch / brake, the power of the internal combustion engine is transmitted to the front motor 1 via the internal combustion engine output shaft 21in → input shaft 14 → first planetary carrier 15 → first sun gear 13, driving the front motor 1 to generate electricity;

[0085] The present invention also provides a drive mode control method for a hybrid power transmission system for agricultural machinery, wherein the drive modes are divided into parking mode, charging mode, engine start mode, pure electric mode, speed coupling mode, torque coupling mode and internal combustion engine mode.

[0086] See Figure 3The present invention also discloses a driving method for a hybrid power transmission system for agricultural machinery, the steps of which are as follows:

[0087] Step S101: Connect the power supply;

[0088] Step S102: Determine if there is a drive signal. If the system does not send a drive signal, proceed to step S103; otherwise, proceed to step S106.

[0089] Step S103: First, determine whether the current SOC value of the battery is greater than the battery's minimum charging SOC value. charge If SOC ≥ SOC charge If yes, proceed to step S104; otherwise, proceed to step S105.

[0090] In step S104, clutch 11 of C1 is disengaged, brakes 2 of B1 and 3 of B2 are locked, and parking P gear mode is executed.

[0091] Step S105: Start the engine and execute the parking charging mode;

[0092] Step S106: Determine whether the current SOC value of the battery is greater than the minimum SOC value allowed for pure electric driving. EV If SOC ≥ SOC EV If yes, proceed to step S107; otherwise, proceed to step S110.

[0093] Step S107: Enter EV mode, the vehicle control system calculates the required drive torque T for the current vehicle. NEED This information is then sent to the transmission controller, along with the shift threshold for pure electric mode. To make a comparison, if If the condition is not met, proceed to step S108; otherwise, proceed to step S109.

[0094] In step S108, brake 2 of B1 engages, and the motor deceleration drive mode is executed;

[0095] Step S109: C2 clutch 10 is locked, and the motor direct drive mode is executed;

[0096] Step S110: Compare the battery's SOC value with the minimum SOC value in HEV mode. HEV For comparison, if SOC ≥ SOC HEV If yes, proceed to step S111; otherwise, proceed to step S115.

[0097] Step S111: Enter HEV mode. The vehicle control system calculates the required drive torque T for the current vehicle. NEED And send it to the transmission controller, along with the shift threshold for HEV mode. To make a comparison, if Then proceed to step S113; otherwise proceed to step S114.

[0098] Step S113: Execute torque coupling mode;

[0099] Step S114: Execute the rotational speed coupling mode;

[0100] Step S115: Enter internal combustion engine drive mode. Determine whether coasting start or crawling is needed based on the current vehicle speed. If V P <V launch If yes, proceed to step S116; otherwise, proceed to step S117.

[0101] Step S116: Perform ICE start-up coasting or crawling;

[0102] Step S117: Enter ICE mode, the vehicle control system calculates the required drive torque T for the current vehicle. NEED And send it to the transmission controller, along with the shift threshold for ICE mode. To make a comparison, if Then proceed to step S118; otherwise proceed to step S119.

[0103] Step S118: Execute engine deceleration drive mode;

[0104] Step S119: Execute engine direct drive mode;

[0105] Step S120: Vehicle operating mode determination completed;

[0106] Furthermore, in HEV mode and internal combustion engine drive mode, the internal combustion engine can directly charge the battery through the first planetary gear set and the front motor.

[0107] Furthermore, during pure electric driving, if the battery's SOC value is lower than the product of the minimum allowable value for pure electric driving and the safety factor λ, then... EV ·λ, i.e., SOC <SOC EV ·λ, then the engine is started by the front motor, and the battery is charged by the front motor to achieve range extension;

[0108] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A hybrid power transmission system for agricultural machinery, characterized in that, The system includes a vehicle controller (201), which is connected to an internal combustion engine controller (202), a front motor controller (203), a rear motor controller (204), a transmission controller (205), and a battery controller (206). The internal combustion engine controller (202) is connected to an internal combustion engine (208), which is connected to a mechanically coupled transmission system (211). The output of the mechanically coupled transmission system (211) is connected to a differential transmission mechanism (210), which transmits power through... The half-shaft transmits power to the drive wheel (209). The front motor controller (203) and the rear motor controller (204) are respectively connected to the front motor (1) and the rear motor (4). The front motor (1) and the rear motor (4) are both connected to the mechanical coupling transmission system (211). The transmission controller (205) is directly connected to the mechanical coupling transmission system (211). The battery controller (206) is connected to the battery pack (207). The battery pack (207) is respectively connected to the front motor (1) and the rear motor (4). The mechanical coupling transmission system (211) includes: an input shaft (14), a first planetary gear set (18), a second planetary gear set (19), a C1 clutch (11), a C2 clutch (10), a B1 brake (2), a B2 brake (3), and an output shaft (8). The front motor (1) is connected to the first planetary gear set, the input shaft (14) is connected to the first planetary gear set, the first planetary gear set is connected to the C1 clutch (11), the C1 clutch (11) is connected to the C2 clutch (10) and the B1 brake (2), the C1 clutch (11) and the C2 clutch (10) are connected to the second planetary gear set, the rear motor (4) is connected to the C2 clutch (10) and the second planetary gear set respectively, and the second planetary gear set is connected to the output shaft (8); the rear motor (4) is connected to the B2 brake (3).

2. The hybrid power transmission system for agricultural machinery according to claim 1, characterized in that, The first planetary gear set includes a first sun gear (13), a first planet gear (12), a first planet carrier (15), and a first ring gear (16); the front motor (1) is fixedly connected to the first sun gear (13), one side of the first sun gear (13) meshes with the first planet gear (12), the first planet gear (12) also meshes with the first ring gear (16), the first ring gear (16) is fixed on the transmission housing (17), and the first planet carrier (15) is set on the first planet gear (12) and connected to the input shaft (14) and the C1 clutch (11) respectively.

3. The hybrid power transmission system for agricultural machinery according to claim 1, characterized in that, The second planetary gear set includes a second sun gear (9), a second planet gear (7), a second planet carrier (5), and a second ring gear (6); the second sun gear (9) is fixedly connected to the rear motor (4) and the C2 clutch (10); the second planet gear (7) meshes with the second sun gear (9) and the second ring gear (6) respectively; the second ring gear (6) is fixedly connected to the C1 clutch (11) and the C2 clutch (10); and the second planet carrier (5) is mounted on the second planet gear (7) and connected to the output shaft (8).

4. A hybrid power transmission system for agricultural machinery according to claim 2, characterized in that, The C1 clutch (11) and C2 clutch (10) respectively include a C1 clutch drive end (11a), a C1 clutch driven end (11b), a C2 clutch drive end (10a) and a C2 clutch driven end (10b); the input shaft (14) is fixedly connected to the first planetary carrier (15) and the C1 clutch drive end (11a); the B1 brake (2) is fixedly connected to the C1 clutch driven end (11b), the C2 clutch drive end (10a) and the second planetary gear set; and the rear motor (4) is fixedly connected to the C2 clutch driven end (10b).

5. A hybrid power transmission system for agricultural machinery according to claim 2, characterized in that, The front motor (1) and the rear motor (4) respectively include: front motor stator (1a), front motor rotor (1b), rear motor stator (4a) and rear motor rotor (4b); the B1 brake (2) and the B2 brake (3) respectively include: B1 brake fixed end (2a), B1 brake rotating end (2b), B2 brake fixed end (3a) and B2 brake rotating end (3b); the first gear ring (16), the B1 brake fixed end (2a), the B2 brake fixed end (3a), the front motor stator (1a) and the rear motor stator (4a) are fixedly connected to the gearbox housing (17) with 0 degrees of freedom.

6. A hybrid power transmission system for agricultural machinery according to claim 1, characterized in that, The vehicle controller (201) is used to read the working status of each module from the internal combustion engine controller (202), front motor controller (203), rear motor controller (204), transmission controller (205), battery controller (206), etc., and then issue instructions to each controller according to the vehicle computer.

7. A driving method for a hybrid power transmission system for agricultural machinery according to any one of claims 1 to 6, characterized in that, The mechanically coupled transmission system (211) includes: an input shaft (14), a first planetary gear set (18), a second planetary gear set (19), a C1 clutch (11), a C2 clutch (10), a B1 brake (2), a B2 brake (3), and an output shaft (8); and includes the following steps: S101, power on; S102, determine if there is a drive signal. If the system does not send a drive signal, proceed to S103; otherwise, proceed to S106. S103, first determine whether the current SOC value of the battery pack (207) is greater than the charging minimum value of the battery pack (207). ,if If the condition is met, proceed to S104; otherwise, proceed to S105. S104, C1 clutch (11) is disengaged, B1 brake (2) and B2 brake (3) are locked, and parking mode is executed; S105, start the engine and enter parking charging mode; S106, Determine whether the current SOC value of the battery pack (207) is greater than the minimum limit allowed for pure electric driving. ,if If yes, proceed to S107; otherwise, proceed to S110. S107, Enter EV mode, the vehicle control system calculates the driving torque required by the vehicle at this time. This information is then sent to the transmission controller, along with the shift threshold for pure electric mode. To make a comparison, if If yes, proceed to S108; otherwise, proceed to S109. S108, B1 brake (2) engages, and motor deceleration drive mode is executed; S109, C2 clutch (10) is locked, and the motor direct drive mode is executed; S110, sets the SOC value of the battery pack (207) and the minimum value in HEV mode. To make a comparison, if If yes, proceed to S111; otherwise, proceed to S115. S111, Enter HEV mode, the vehicle control system calculates the driving torque required by the vehicle at this time. And send it to the transmission controller, along with the shift threshold for HEV mode. To make a comparison, if If yes, proceed to S113; otherwise, proceed to S114. S113, execute torque coupling mode; S114, execute speed coupling mode; S115, enter internal combustion engine drive mode, determine whether to use coasting start or creeping based on current vehicle speed. If yes, proceed to S116; otherwise, proceed to S117. S116, execute ICE start-up coasting or crawling; S117, Enter ICE mode, the vehicle control system calculates the current driving torque required by the vehicle. And send it to the transmission controller, along with the shift threshold for ICE mode. To make a comparison, if If yes, proceed to S118; otherwise, proceed to S119. S118, Execute engine deceleration drive mode; S119, execute engine direct drive mode; S120, vehicle operating mode determination completed.

8. The driving method for a hybrid power transmission system for agricultural machinery according to claim 7, characterized in that, In HEV mode and internal combustion engine drive mode, the internal combustion engine can directly charge the battery pack (207) through the first planetary gear set (18) and the front motor (1).

9. The driving method for a hybrid power transmission system for agricultural machinery according to claim 7, characterized in that, When driving in pure electric mode, if the SOC value of the battery pack (207) is lower than the minimum allowable limit and safety factor for pure electric driving... product ,Right now Then the engine is started by the front motor (1), and the battery pack (207) is charged by the front motor (1) to achieve extended range driving.

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