CN117207768A - Series-parallel hybrid power gear shifting system and gear shifting control method for commercial vehicle - Google Patents
Series-parallel hybrid power gear shifting system and gear shifting control method for commercial vehicle Download PDFInfo
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Abstract
The application provides a series-parallel hybrid power gear shifting system and a gear shifting control method of a commercial vehicle, wherein the system comprises the following components: the electric drive axle gear shifting unit, the gearbox gear shifting unit, the first torque transmission unit and the second torque transmission unit; the electric drive bridge gear shifting unit judges whether gear shifting is needed according to the acquired vehicle operation parameters, and executes electric drive bridge gear shifting operation when gear shifting is needed; controlling whether power is interrupted during gear shifting through a first torque transmission unit; the gearbox gear shifting unit judges whether gear shifting is needed or not according to the acquired vehicle operation parameters, and calculates the optimal gear of the gearbox; when gear shifting is needed, determining that the clutch is disengaged to perform speed regulation operation, and executing gear shifting operation of a gearbox; whether power is interrupted during a gear shift is controlled by the second torque transmission unit. Based on the system, the application also provides a series-parallel hybrid power shift control method of the commercial vehicle, which improves the shift smoothness of the series-parallel hybrid power system of the multi-axis driving commercial vehicle and improves the fuel saving rate of the system.
Description
Technical Field
The application belongs to the technical field of shift control of commercial vehicles, and particularly relates to a series-parallel hybrid power shift system and a shift control method of a commercial vehicle.
Background
The dual-motor series-parallel hybrid system has been fully proved to be capable of achieving higher oil saving rate, the dual-motor hybrid system based on the gasoline engine is capable of achieving 30% oil saving rate, and the dual-motor hybrid system is capable of achieving decoupling of rotating speed and vehicle speed and decoupling of engine torque and required driving power, so that higher oil saving rate can be achieved.
Unlike gasoline engines, diesel engines have a gradient far smaller than gasoline engines, so that the series hybrid mode is applied to diesel engines only under partial working conditions to achieve improvement of system efficiency, and the diesel engine hybrid system is more dependent on torque regulation and transient process control to achieve improvement of fuel saving rate. The other difference with the gasoline engine is that the speed range of the diesel engine adopted by the heavy commercial vehicle is narrower, but the speed change of the vehicle is not smaller than that of a car, and the demand of the heavy commercial vehicle for starting torque is larger, so that the hybrid power of the commercial vehicle still needs multiple gears to coordinate the demands of the speed and the torque from the driving level. The traditional power assembly is in a centralized driving mode, the output torque of an engine reaches the wheel end to drive the vehicle after passing through a speed changer and a mechanical bridge, and the double mechanical bridge realizes axle differential control by means of a mechanical differential mechanism. Therefore, the series-parallel hybrid power system is urgently needed to realize the fuel saving rate and the system modularization.
Disclosure of Invention
In order to solve the technical problems, the application provides a series-parallel hybrid power gear shifting system and a gear shifting control method of a commercial vehicle, which are used for definitely controlling a gear shifting mode and a gear shifting process and aim to improve the gear shifting smoothness of the series-parallel hybrid power system of the multi-shaft driving commercial vehicle and improve the oil saving rate of the whole system.
In order to achieve the above purpose, the present application adopts the following technical scheme:
a series-parallel hybrid power shift system of a commercial vehicle comprises an electrically driven bridge shift unit, a gearbox shift unit, a first torque transmission unit and a second torque transmission unit;
the electric drive bridge gear shifting unit is used for judging whether gear shifting is needed according to the acquired vehicle operation parameters, and executing gear shifting operation when the speed difference between an output shaft and an input shaft after motor speed regulation is less than a speed threshold value when gear shifting is needed; and controlling, by the first torque transfer unit, whether power is interrupted at the time of gear shifting;
the gearbox shifting unit is used for judging whether gear shifting is needed or not and calculating the optimal gear of the gearbox according to the acquired vehicle operation parameters; when gear shifting is needed, determining that the clutch is disengaged to perform speed regulation operation; executing gear shifting operation when judging that the rotating speed difference between the output shaft and the input shaft after motor speed regulation is smaller than a rotating speed threshold value; and controlling, by the second torque transmission unit, whether power is interrupted at the time of gear shifting.
Further, the system further comprises:
the electric drive bridge shifting unit and the gearbox shifting unit execute shifting according to a preset control time sequence, and power is interrupted during shifting; or when the electric drive bridge gear shifting unit executes gear shifting, the gearbox outputs torque; when the gearbox shifting unit executes shifting, the electric drive axle outputs torque.
Further, the first torque transfer unit includes an engine, a clutch, a P2 motor, a transmission, and a first mechanical bridge;
the output end of the engine crankshaft is connected with the clutch; a P2 motor is arranged between the clutch and the gearbox; the gearbox and the first mechanical bridge transmit power through a transmission shaft; the differential in the first mechanical axle transfers torque to the wheels through the axle shafts.
Further, the second torque transfer unit includes a rear axle motor, a speed reducer, and a second mechanical bridge;
the rear axle motor output shaft is connected to a second mechanical axle through a speed reducer, and the torque of the second mechanical axle is transmitted to wheels.
Further, the system also comprises a power supply module; the power supply module supplies power to the first torque transmission unit and the second torque transmission unit respectively.
Further, after the gear shifting operation is executed, the gear shifting unit of the gearbox judges whether clutch fitting operation is needed, the clutch fitting process is needed to be carried out by means of an engine, clutch fitting operation is started when the front and rear rotating speeds of the clutch are smaller than a second rotating speed threshold value, and torque adjustment is carried out on the engine and the P2 motor after fitting is completed.
Further, when the electric drive bridge shifting unit performs shifting, the gearbox outputs torque; when the gearbox gear shifting unit executes gear shifting, the process of outputting torque by the electric drive bridge comprises the following steps:
when the electric drive bridge gear shifting unit executes gear shifting, the engine or the P2 motor enters a state to be maintained, and output torque when a gear shifting instruction is sent is maintained;
when the gearbox gear shifting unit executes gear shifting, the electric drive bridge motor enters a state to be maintained, and output torque when a gear shifting instruction is sent is maintained.
The application also provides a series-parallel hybrid power gear shift control method of the commercial vehicle, which comprises the following steps:
acquiring vehicle operation parameters through an electric drive axle gear shifting unit, judging whether gear shifting is needed according to the vehicle operation parameters, and executing gear shifting operation when judging that the rotation speed difference between an output shaft and an input shaft after motor speed regulation is smaller than a rotation speed threshold value when gear shifting is needed; controlling whether power is interrupted during gear shifting through a first torque transmission unit;
acquiring vehicle operation parameters through a gearbox gear shifting unit, judging whether gear shifting is needed or not according to the vehicle operation parameters, and calculating an optimal transmission gear; when gear shifting is needed, determining that the clutch is disengaged to perform speed regulation operation; executing gear shifting operation when judging that the rotating speed difference between the output shaft and the input shaft after motor speed regulation is smaller than a rotating speed threshold value; and controlling, by the second torque transmission unit, whether power is interrupted at the time of gear shifting.
Further, the method further comprises: and enabling the electric drive bridge shifting unit and the gearbox shifting unit to execute shifting according to a preset control time sequence, and interrupting power during shifting.
Further, the method further comprises: when the electric drive bridge gear shifting unit is used for executing gear shifting, the gearbox outputs torque; when the gear shifting unit of the gearbox executes gear shifting, the electric drive axle outputs torque
The effects provided in the summary of the application are merely effects of embodiments, not all effects of the application, and one of the above technical solutions has the following advantages or beneficial effects:
the application provides a series-parallel hybrid power gear shifting system and a gear shifting control method of a commercial vehicle, wherein the system comprises the following components: the electric drive axle gear shifting unit, the gearbox gear shifting unit, the first torque transmission unit and the second torque transmission unit; the electric drive bridge gear shifting unit is used for judging whether gear shifting is needed according to the acquired vehicle operation parameters, and executing gear shifting operation when the speed difference between the output shaft and the input shaft after the speed regulation of the motor is less than a speed threshold value when the gear shifting is needed; and controlling, by the first torque transfer unit, whether power is interrupted at the time of gear shifting; the gearbox shifting unit is used for judging whether gear shifting is needed or not and calculating the optimal gear of the gearbox according to the acquired vehicle operation parameters; when gear shifting is needed, determining that the clutch is disengaged to perform speed regulation operation; executing gear shifting operation when judging that the rotating speed difference between the output shaft and the input shaft after motor speed regulation is smaller than a rotating speed threshold value; and controlling, by the second torque transmission unit, whether power is interrupted at the time of gear shifting. The electric drive bridge shifting unit and the gearbox shifting unit execute shifting according to a preset control time sequence, and power is interrupted during shifting; or when the electric drive bridge gear shifting unit executes gear shifting, the gearbox outputs torque; when the gearbox shifting unit executes shifting, the electric drive axle outputs torque. The application discloses a series-parallel hybrid power shift control method of a commercial vehicle based on a series-parallel hybrid power shift system of the commercial vehicle, and aims to improve the shift smoothness of the series-parallel hybrid power system of the multi-shaft driven commercial vehicle and improve the oil saving rate of the whole system.
Drawings
Fig. 1 is a schematic connection diagram of a series-parallel hybrid power shift system of a commercial vehicle according to embodiment 1 of the present application;
fig. 2 is a gear shifting pattern diagram of a serial-parallel hybrid power system of a multi-shaft driving commercial vehicle according to embodiment 2 of the present application;
FIG. 3 is a flow chart illustrating a shift control in a single shift-power interrupt mode for an electrically driven bridge according to embodiment 2 of the present application;
FIG. 4 is a flow chart illustrating a shift control in a transmission single shift-power interrupt mode according to embodiment 2 of the present application;
FIG. 5 is a flow chart of a transmission and electric drive axle simultaneous shift-power interrupt mode shift control proposed in embodiment 2 of the present application;
1-an engine; a 2-clutch; a 3-P2 motor; a 4-speed variator; 5-a first mechanical bridge; 6-a rear axle motor; 7-a speed reducer; 8-second mechanical bridge and 9-power battery.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present application will be described in detail below with reference to the following detailed description and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different structures of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Furthermore, the present application may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily obscure the present application.
Example 1
The embodiment 1 of the application provides a series-parallel hybrid power gear shifting system of a commercial vehicle, which solves the control problem of the gear shifting process of the series-parallel hybrid power system of the multi-shaft driving commercial vehicle. The system comprises: the electric drive axle gear shifting unit, the gearbox gear shifting unit, the first torque transmission unit and the second torque transmission unit;
the electric drive bridge gear shifting unit is used for judging whether gear shifting is needed according to the acquired vehicle operation parameters, and executing gear shifting operation when the speed difference between the output shaft and the input shaft after the speed regulation of the motor is less than a speed threshold value when the gear shifting is needed; and controlling, by the first torque transfer unit, whether power is interrupted at the time of gear shifting;
the gearbox shifting unit is used for judging whether gear shifting is needed or not and calculating the optimal gear of the gearbox according to the acquired vehicle operation parameters; when gear shifting is needed, determining that the clutch is disengaged to perform speed regulation operation; executing gear shifting operation when judging that the rotating speed difference between the output shaft and the input shaft after motor speed regulation is smaller than a rotating speed threshold value; and controlling, by the second torque transmission unit, whether power is interrupted at the time of gear shifting.
In the system, an electric drive bridge shifting unit and a gearbox shifting unit execute shifting according to a preset control time sequence, and power is interrupted during shifting; or when the electric drive bridge gear shifting unit executes gear shifting, the gearbox outputs torque; when the gearbox shifting unit executes shifting, the electric drive axle outputs torque.
When the electric drive bridge gear shifting unit executes gear shifting, the engine or the P2 motor enters a state to be maintained, and output torque when a gear shifting instruction is sent is maintained;
when the gearbox gear shifting unit executes gear shifting, the electric drive bridge motor enters a state to be maintained, and output torque when a gear shifting instruction is sent is maintained.
Fig. 1 is a schematic connection diagram of a series-parallel hybrid power shift system of a commercial vehicle according to embodiment 1 of the present application;
the first torque transfer unit comprises an engine 1, a clutch 2, a P2 electric machine 3, a transmission 4 and a first mechanical bridge 5; the output end of a crankshaft of the engine 1 is connected with a clutch 2; a P2 motor 3 is arranged between the clutch 2 and the gearbox 4; the gearbox 4 and the first mechanical bridge 5 transmit power through a transmission shaft; the differential in the first mechanical axle 5 transmits torque to the wheels through the half shafts; wherein the first mechanical bridge 5 is a middle bridge.
The second torque transfer unit comprises a rear axle motor 6, a speed reducer 7 and a second mechanical axle 8; the output shaft of the rear axle motor 6 is connected to a second mechanical axle 8 through a speed reducer 7, and the torque of the second mechanical axle 8 is transmitted to wheels; wherein the second mechanical axle 8 is a rear axle.
Both torque transfer units have shift execution members, the first being a transmission and the second being a reduction gear.
The torque transfer of the first torque transfer unit is marked with solid lines; the torque transfer of the second torque transfer unit is marked with a dashed line.
The system also comprises a power supply module; the power supply module supplies power to the first torque transmission unit and the second torque transmission unit respectively. The power supply module in the application adopts a power battery 9. In the application, the power batteries respectively supply power to the P2 motor 3 and the rear axle motor 6.
The serial-parallel hybrid power shift system of the commercial vehicle provided by the embodiment 1 of the application can realize power interruption during independent gear shifting of the electric drive axle, power interruption during independent gear shifting of the gearbox, and power interruption during simultaneous gear shifting of the two. The key points are to clearly control the gear shifting mode and the gear shifting process, and the aim is to improve the gear shifting smoothness of the serial-parallel hybrid power system of the multi-shaft driving commercial vehicle and improve the oil saving rate of the whole system.
Example 2
Based on the series-parallel hybrid power shift system of the commercial vehicle provided by the embodiment 1 of the application, the embodiment 2 of the application provides a series-parallel hybrid power shift control method of the commercial vehicle, which comprises the following steps:
acquiring vehicle operation parameters through an electric drive axle gear shifting unit, judging whether gear shifting is needed according to the vehicle operation parameters, and executing gear shifting operation when judging that the rotation speed difference between an output shaft and an input shaft after motor speed regulation is smaller than a rotation speed threshold value when gear shifting is needed; controlling whether power is interrupted during gear shifting through a first torque transmission unit;
acquiring vehicle operation parameters through a gearbox gear shifting unit, judging whether gear shifting is needed or not according to the vehicle operation parameters, and calculating an optimal transmission gear; when gear shifting is needed, determining that the clutch is disengaged to perform speed regulation operation; executing gear shifting operation when judging that the rotating speed difference between the output shaft and the input shaft after motor speed regulation is smaller than a rotating speed threshold value; and controlling, by the second torque transmission unit, whether power is interrupted at the time of gear shifting.
The method further comprises the steps of: and enabling the electric drive bridge shifting unit and the gearbox shifting unit to execute shifting according to a preset control time sequence, and interrupting power during shifting.
When the electric drive bridge gear shifting unit is used for executing gear shifting, the gearbox outputs torque; when the gear box shifting unit is used for executing gear shifting, the electric drive axle outputs torque.
Fig. 2 is a gear shifting pattern diagram of a serial-parallel hybrid power system of a multi-shaft driving commercial vehicle according to embodiment 2 of the present application; the electric drive bridge can realize power interruption during independent gear shifting of the electric drive bridge, power interruption during independent gear shifting of the gearbox, and power interruption during simultaneous gear shifting of the gearbox and the gearbox.
Fig. 3 is a flow chart of a gear shifting control in an electric drive bridge single gear shifting-power interruption mode according to embodiment 2 of the present application, first, four key parameters including a vehicle speed, a torque, a gradient and a current gear are input into an electric drive bridge gear MAP, and the current gear and a gear set in the MAP are determined to determine whether a gear shifting is required. The electric drive bridge gear MAP is an optimal electric drive bridge gear under different running conditions calculated according to an equivalent fuel consumption algorithm and is an off-line optimization value. If a gear shift is needed, a gear shift request is output, a gear shift speed regulation process is finished by means of an electric drive bridge motor, then whether gear shift operation can be executed is judged, and the specific judging condition is that the rotation speed difference of an output shaft and an input shaft is smaller than 5rpm, and when the rotation speed difference is smaller than 5rpm, the gear shift operation is finished by a gear shift deflector rod. And after judging that the gear shifting operation is finished, determining whether motor torque adjustment is needed according to the operation working condition.
Electric drive bridge single shift-power is not interrupted: the judging process of the electric drive bridge gear shifting in the current mode is consistent with the process of the interruption mode, and the difference is that the power is not interrupted in the process of executing the gear shifting operation by the electric drive bridge. The condition for achieving uninterrupted power is that one of the two torque paths must be available for torque output. When the electric drive bridge executes gear shifting operation, the other torque route must have torque output, the other torque route power source comprises an engine and a P2 motor, and in the gear shifting process of the electric drive bridge, if the power generated by the condition is not interrupted, the engine or the P2 motor enters a state to be maintained, and the output torque when a gear shifting command is generated is maintained.
FIG. 4 is a flow chart illustrating a shift control in a transmission single shift-power interrupt mode according to embodiment 2 of the present application; firstly, four key parameters of a vehicle speed, a torque, a gradient and a current gear are input into a gear MAP of a gearbox, and the current gear and the gear set in the MAP are judged to determine whether gear shifting is needed. The transmission gear MAP is an optimal transmission gear under different running conditions calculated according to an equivalent fuel consumption algorithm and is an offline optimization value. If a shift is required, a shift request is output, the clutch state is determined before the shift operation is performed, whether the clutch is disengaged is determined, if the clutch is not disengaged, the clutch disengagement operation is performed first, and after the clutch state determination is completed, the speed regulation operation is performed. The gear shifting and speed regulating process is finished by means of a P2 motor, and then whether gear shifting operation can be carried out is judged, wherein the specific judging condition is that the rotation speed difference of an output shaft and an input shaft is smaller than 5rpm, and when the rotation speed difference is smaller than 5rpm, the gear shifting operation is finished by a gear shifting deflector rod. After gear shifting is completed, the clutch state is required to be judged, whether clutch attaching operation is required or not is judged, the clutch attaching process is required to be regulated by means of an engine, clutch attaching operation is started when the front and rear rotating speeds of the clutch are smaller than 10rpm, and torque regulation is performed between the engine and a P2 motor after attaching is completed.
Gearbox individual shift-power is not interrupted: the decision process of the gearbox gear shift in the current mode is consistent with the interruption process, and the difference is that the power is not interrupted in the process of the gearbox executing the gear shift operation. In the process of gear shifting of the gearbox, if the power is not interrupted, the other torque route needs to have torque output, and the other torque route power source is the electric drive bridge motor, and in the process of gear shifting of the gearbox, if the power generated by the condition is not interrupted, the electric drive bridge motor is controlled to maintain the output torque when a gear shifting command is generated.
FIG. 5 is a flow chart of a transmission and electric drive axle simultaneous shift-power interrupt mode shift control proposed in embodiment 2 of the present application; the two parts are simultaneously shifted, the operation executed by a single shifting part is similar to the independent shifting process of the corresponding part, but the time sequence control is needed to be carried out on the specific shifting process, the specific strategy is to complete the gear shifting of the gearbox first, and the electric drive bridge shifting is carried out after the gear shifting completion instruction of the gearbox is output.
While shift-power is not interrupted: when shifting gears simultaneously, and power is not interrupted, one torque route needs to keep torque output when the other torque route executes gear shifting, and a specific control strategy is as follows: when the electric drive bridge shifts gears, the engine or the P2 motor enters a state to be maintained, and the output torque when a gear shifting instruction is sent is maintained; when the gearbox shifts, the electric drive bridge motor enters a state to be maintained, and output torque when a shift command is sent is maintained.
The serial-parallel hybrid power shift control method for the commercial vehicle provided by the embodiment 2 of the application can realize power interruption during individual shifting of the electric drive axle, power interruption during individual shifting of the gearbox, and power interruption during simultaneous shifting of the two. The key points are to clearly control the gear shifting mode and the gear shifting process, and the aim is to improve the gear shifting smoothness of the serial-parallel hybrid power system of the multi-shaft driving commercial vehicle and improve the oil saving rate of the whole system.
The description of the relevant parts in the series-parallel hybrid power shift control method for the commercial vehicle provided in embodiment 2 of the present application may refer to the detailed description of the corresponding parts in the series-parallel hybrid power shift system for the commercial vehicle provided in embodiment 1 of the present application, and will not be repeated here.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is inherent to. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. In addition, the parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of the corresponding technical solutions in the prior art, are not described in detail, so that redundant descriptions are avoided.
While the specific embodiments of the present application have been described above with reference to the drawings, the scope of the present application is not limited thereto. Other modifications and variations to the present application will be apparent to those of skill in the art upon review of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. On the basis of the technical scheme of the application, various modifications or variations which can be made by the person skilled in the art without the need of creative efforts are still within the protection scope of the application.
Claims (10)
1. The series-parallel hybrid power shift system of the commercial vehicle is characterized by comprising an electrically driven bridge shift unit, a gearbox shift unit, a first torque transmission unit and a second torque transmission unit;
the electric drive bridge gear shifting unit is used for judging whether gear shifting is needed according to the acquired vehicle operation parameters, and executing gear shifting operation when the speed difference between an output shaft and an input shaft after motor speed regulation is less than a speed threshold value when gear shifting is needed; and controlling, by the first torque transfer unit, whether power is interrupted at the time of gear shifting;
the gearbox shifting unit is used for judging whether gear shifting is needed or not and calculating the optimal gear of the gearbox according to the acquired vehicle operation parameters; when gear shifting is needed, determining that the clutch is disengaged to perform speed regulation operation; executing gear shifting operation when judging that the rotating speed difference between the output shaft and the input shaft after motor speed regulation is smaller than a rotating speed threshold value; and controlling, by the second torque transmission unit, whether power is interrupted at the time of gear shifting.
2. The series-parallel hybrid shift system of a commercial vehicle of claim 1, further comprising:
the electric drive bridge shifting unit and the gearbox shifting unit execute shifting according to a preset control time sequence, and power is interrupted during shifting; or when the electric drive bridge gear shifting unit executes gear shifting, the gearbox outputs torque; when the gearbox shifting unit executes shifting, the electric drive axle outputs torque.
3. The series-parallel hybrid shift system of a commercial vehicle of claim 1, wherein the first torque transfer unit comprises an engine, a clutch, a P2 motor, a transmission, and a first mechanical bridge;
the output end of the engine crankshaft is connected with the clutch; a P2 motor is arranged between the clutch and the gearbox; the gearbox and the first mechanical bridge transmit power through a transmission shaft; the differential in the first mechanical axle transfers torque to the wheels through the axle shafts.
4. The series-parallel hybrid shift system of a commercial vehicle of claim 1, wherein the second torque transfer unit comprises a rear axle motor, a reduction gear, and a second mechanical bridge;
the rear axle motor output shaft is connected to a second mechanical axle through a speed reducer, and the torque of the second mechanical axle is transmitted to wheels.
5. The series-parallel hybrid shift system of a commercial vehicle of claim 1, further comprising a power module; the power supply module supplies power to the first torque transmission unit and the second torque transmission unit respectively.
6. The series-parallel hybrid power shift system of a commercial vehicle according to claim 1, wherein the transmission shift unit determines whether a clutch engagement operation is required after performing the shift operation, the clutch engagement process is to be performed by means of an engine, the clutch engagement operation is started when the front-rear rotational speed of the clutch is less than a second rotational speed threshold, and the engine and the P2 motor are subjected to torque adjustment after engagement.
7. The series-parallel hybrid power shift system of a commercial vehicle according to claim 2, wherein the electro-bridge shift unit outputs torque from the transmission when performing a shift; when the gearbox gear shifting unit executes gear shifting, the process of outputting torque by the electric drive bridge comprises the following steps:
when the electric drive bridge gear shifting unit executes gear shifting, the engine or the P2 motor enters a state to be maintained, and output torque when a gear shifting instruction is sent is maintained;
when the gearbox gear shifting unit executes gear shifting, the electric drive bridge motor enters a state to be maintained, and output torque when a gear shifting instruction is sent is maintained.
8. The serial-parallel hybrid power gear shifting control method for the commercial vehicle is characterized by comprising the following steps of:
acquiring vehicle operation parameters through an electric drive axle gear shifting unit, judging whether gear shifting is needed according to the vehicle operation parameters, and executing gear shifting operation when judging that the rotation speed difference between an output shaft and an input shaft after motor speed regulation is smaller than a rotation speed threshold value when gear shifting is needed; controlling whether power is interrupted during gear shifting through a first torque transmission unit;
acquiring vehicle operation parameters through a gearbox gear shifting unit, judging whether gear shifting is needed or not according to the vehicle operation parameters, and calculating an optimal transmission gear; when gear shifting is needed, determining that the clutch is disengaged to perform speed regulation operation; executing gear shifting operation when judging that the rotating speed difference between the output shaft and the input shaft after motor speed regulation is smaller than a rotating speed threshold value; and controlling, by the second torque transmission unit, whether power is interrupted at the time of gear shifting.
9. The method for series-parallel hybrid shift control of a commercial vehicle according to claim 8, further comprising: and enabling the electric drive bridge shifting unit and the gearbox shifting unit to execute shifting according to a preset control time sequence, and interrupting power during shifting.
10. The method for series-parallel hybrid shift control of a commercial vehicle according to claim 9, further comprising: when the electric drive bridge gear shifting unit is used for executing gear shifting, the gearbox outputs torque; when the gear box shifting unit is used for executing gear shifting, the electric drive axle outputs torque.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311304418.7A CN117207768A (en) | 2023-10-10 | 2023-10-10 | Series-parallel hybrid power gear shifting system and gear shifting control method for commercial vehicle |
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| CN202311304418.7A CN117207768A (en) | 2023-10-10 | 2023-10-10 | Series-parallel hybrid power gear shifting system and gear shifting control method for commercial vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117681683A (en) * | 2024-02-02 | 2024-03-12 | 潍柴动力股份有限公司 | Gear shifting control method and device of power assembly and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117681683A (en) * | 2024-02-02 | 2024-03-12 | 潍柴动力股份有限公司 | Gear shifting control method and device of power assembly and vehicle |
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