Multi-shaft hybrid power all-wheel drive chassis system, control method and electronic equipment

Abstract

The invention relates to a multi-shaft hybrid power all-wheel drive chassis system, a control method and electronic equipment.The chassis system comprises a first shaft, a second shaft, a third shaft and a plurality of expansion shafts which are sequentially installed on a chassis, the hybrid power drive axle comprises an engine, an ISG motor, a clutch, a transmission, a main speed reducer, a differential mechanism and driving wheels. The second shaft, the third shaft and the expansion shafts are all driven by hub motors in a distributed mode, and electric driving and regenerative braking are achieved by controlling the rotating speed and torque of electric driving wheels of the hub motors through motor controllers. Compared with the prior art, the method has the advantages that modes are automatically selected and switched, normal operation of the vehicle is guaranteed through redundant power, and fuel economy is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle hybrid power drive, and in particular to a multi-axle hybrid power all-wheel drive chassis system, a control method and an electronic device. Background Art

[0002] In the field of multi-axle heavy-duty commercial vehicles, especially multi-axle all-wheel drive heavy-duty commercial vehicles, there are currently only pure mechanical drive forms and series hybrid drive forms in which the engine power is decoupled from the wheels. The pure mechanical drive mode is constrained by the mechanical transmission efficiency and the size of the mechanical structure, and can only meet the requirements of all-wheel drive within six axles. The series hybrid drive form in which the engine is decoupled from the wheels can achieve the expansion of the number of drive axles through the flexible arrangement of the electric drive axle. However, the form of decoupling the engine from the wheels makes it difficult to maximize the energy efficiency of the hybrid system through mode changes, and when the electric drive unit fails, the engine cannot be used as a redundant power source to ensure the normal driving of the vehicle. The above scheme is difficult to apply in large quantities in the field of special transportation with extremely high reliability requirements. In summary, the existing technology is difficult to meet the electrification and low-carbonization needs of multi-axle vehicle all-wheel drive.

[0003] After searching, the Chinese invention patent application publication number CN218141022U discloses a hybrid power drive system for heavy-duty vehicles, including an intermediate drive axle, a rear electric drive axle, and a power battery; the intermediate drive axle is driven by an internal combustion engine, the rear electric drive axle is electrically driven, the internal combustion engine drive and the electrical drive are two independent drive systems, the power battery is connected to the rear electric drive axle to provide electrical energy; the front wheels, the intermediate drive axle, the rear drive axle, and the power battery are all arranged on the frame. This existing patent application has the problem that it cannot automatically realize mode conversion to maximize energy efficiency, and the engine does not serve as a redundant power to ensure normal operation in the event of a failure.

[0004] How to realize a multi-axle hybrid all-wheel drive chassis system and control with automatic mode change and redundant drive mode has become a technical problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-axle hybrid all-wheel drive chassis system, a control method and an electronic device in order to overcome the defects of the above-mentioned prior art.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, a multi-axle hybrid all-wheel drive chassis system is provided, the chassis system comprising a first axle, a second axle, a third axle and a plurality of extension axles sequentially mounted on the chassis, wherein the first axle is driven by a hybrid powertrain and is equipped with a hybrid powertrain drive axle, the hybrid powertrain drive axle comprising an engine, an ISG motor, a clutch, a transmission, a main reducer and a differential, and a drive wheel;

[0008] The second axis, the third axis and multiple extension axes are all distributedly driven by hub motors, and electric drive and regenerative braking are achieved by controlling the electric drive wheel speed and torque of the hub motor through a motor controller.

[0009] Preferably, the engine and ISG motor adopt a parallel oil-electric coupling scheme, and the power of the first shaft is transmitted to the transmission via the engine and the ISG motor, and then transmitted to the drive wheels through the main reducer and the differential;

[0010] A clutch is arranged between the ISG motor and the transmission for switching the hybrid mode;

[0011] When the electric drive system fails, by controlling the engagement of the clutch, the engine power is directly transmitted to the drive wheels of the first shaft through the transmission, the final reducer and the differential.

[0012] Preferably, the chassis system further includes a DC bus and a battery pack;

[0013] The ISG motor is connected to the DC bus through a controller and an inverter, and supplies power to the DC bus and the battery pack in the power generation mode;

[0014] The DC bus relies on the battery pack to maintain and balance the bus voltage.

[0015] More preferably, the wheel hub motor is powered by a DC bus and directly drives the electric drive wheel to work; during braking, the wheel hub motor acts as a generator to recover the kinetic energy of the vehicle.

[0016] Preferably, the ISG motor and the engine form a generator set to supply power to the DC bus.

[0017] According to another aspect of the present invention, a control method for a multi-axle hybrid all-wheel drive chassis system is provided, wherein the drive control method comprises the following steps:

[0018] Determine whether to enter the automatic mode according to the accelerator pedal signal, the brake pedal signal and the mode switching handle signal;

[0019] The vehicle enters the automatic mode and works according to the automatically selected driving mode to check the working status of the electric drive system. If the electric drive system has a fault that affects the normal driving of the vehicle, it enters the redundant driving mode and the engine directly drives the first axle to enable the vehicle to drive normally.

[0020] If the electric drive system is normal, the power battery state of charge is checked. If the battery state of charge is lower than the minimum threshold SoC_low, the extended range mode is entered;

[0021] If the battery state of charge is not lower than the minimum threshold SoC_low, it is determined whether the electric drive power can meet the driving requirements. If the electric drive power of only one axle can meet the driving power of the entire vehicle, it is a single-axis pure electric drive mode; if the electric drive power of multiple axles working together can meet the driving power, it is a combined electric drive mode; if the sum of the electric drive power of all axles cannot meet the driving requirements of the vehicle, the first axle also participates in the drive, and the vehicle operates in a hybrid drive mode.

[0022] Preferably, the method also includes: if it is determined to be a manual mode, checking the vehicle status and determining whether the current vehicle status can meet the current mode; if so, the vehicle operates according to the mode selected by the joystick; if not, the vehicle operates according to the automatically selected drive mode, and prompting the driver on the dashboard or other display device that the current mode is not suitable and has been switched to automatic mode.

[0023] Preferably, the method further includes: in the extended-range mode, the engine provides additional power to charge the power battery on the basis of meeting the power required for driving; if the battery state of charge is higher than the maximum threshold SoC_hig, the extended-range mode is exited and the engine stops generating electricity.

[0024] Preferably, the method also includes: when the battery is low on power, disconnecting the clutch of the first shaft, and the engine and ISG motor form a generator set to charge the battery pack; or closing the clutch of the first shaft, and the engine outputs additional power to drive the first shaft to work during the power generation process.

[0025] According to a third aspect of the present invention, there is provided an electronic device, comprising a memory and a processor, wherein a control program is stored in the memory, and the method described above is implemented when the processor executes the program.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1) The multi-axle hybrid all-wheel drive chassis system of the present invention includes a first axle driven by a hybrid oil-electric system and a plurality of axles driven by hub motors. The engine and the ISG motor adopt a parallel oil-electric coupling scheme. When the electric drive system fails, the hybrid mode is switched by engaging the clutch to ensure the normal driving of the vehicle and optimize the fuel economy of the vehicle.

[0028] 2) The hub motor and ISG motor of the present invention can both be used as generators to recover the kinetic energy of the vehicle during braking. The ISG motor and the engine form a generator set to supply power to the DC bus. The hub motor is powered by the DC bus, making full use of the conversion of various energies and improving energy utilization.

[0029] 3) The present invention supports manual mode and automatic mode. The automatic mode includes a variety of driving modes that can be automatically switched: redundant driving mode, extended-range mode, hybrid driving mode, combined electric driving mode and pure electric driving mode, and realizes automatic selection and switching of various modes. On the basis of ensuring the normal operation of the vehicle, it gives priority to the use of electric energy to drive, reduces the fuel consumption of heavy vehicles, and improves fuel economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a layout diagram of a multi-axle hybrid all-wheel drive chassis system in Embodiment 1 of the present invention;

[0031] Figure 2 It is a layout diagram of a multi-axle hybrid all-wheel drive chassis system in Embodiment 2 of the present invention;

[0032] Figure 3 It is a flow chart of the hybrid power mode switching control method in the present invention;

[0033] In the attached figure, 001 is the first shaft, 002 is the second shaft, 003 is the third shaft, 004 is the expansion shaft, 0011 is the engine, 0012 is the ISG motor, 0013 is the clutch, 0014 is the transmission, 0015 is the main reducer and differential, 0016 is the drive wheel, 0018 is the controller and inverter, 0019 is the DC bus, 0020 is the battery pack, 0021 is the motor controller, 0022 is the hub motor, and 0023 is the electric drive wheel. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] Example 1

[0036] This embodiment relates to a multi-axle hybrid all-wheel drive chassis system, such as Figure 1 , including a first shaft 001, a second shaft 002 and a third shaft 003 respectively installed on the chassis, wherein the first shaft 001 is a hybrid drive, and the first shaft is equipped with a hybrid drive axle, which includes an engine 0011, an integrated starter generator (i.e., ISG motor) 0012, a clutch 0013, a transmission 0014, a main reducer and differential 0015 and a drive wheel 0016.

[0037] The engine 0011 and the ISG motor 0012 adopt a parallel oil-electric coupling scheme of P1 configuration; the power of the first shaft 001 is transmitted to the two-speed transmission 0014 via the engine 0011 and the ISG motor 0012, and then transmitted to the drive wheel 0016 through the main reducer and the differential 0015. A clutch 0013 is arranged between the ISG motor 0012 and the transmission 0014 for switching the hybrid mode; the ISG motor 0012 is connected to the DC bus 0019 through the controller and the inverter 0018, and supplies power to the bus and the battery in the power generation mode; the DC bus 0019 relies on the 800V battery pack (0020) to maintain and balance the bus voltage.

[0038] The ISG motor 0012 can be used as an electric motor to start the engine, or as a generator for regenerative braking when the vehicle brakes, or it can form a generator set with the engine to supply power to the DC bus 0019.

[0039] The second shaft 002 and the third shaft 003 are distributedly driven by the wheel hub motors. The second shaft 002 and the third shaft 003 control the speed and torque of the electric drive wheels 0023 of the wheel hub motors 0022 through the motor controller 0021 connected to the DC bus 0019 to achieve electric drive and regenerative braking. The DC bus 0019 is a high-voltage DC bus. The wheel hub motors 0022 are powered by the DC bus 0019 and directly drive the electric drive wheels 0023 of the second shaft 002 and the third shaft 003. When braking, the wheel hub motors 0022 can be used as generators to recover the kinetic energy of the vehicle.

[0040] The chassis can be adapted to a multi-axle vehicle equipped with one or more driven axles, depending on the circumstances.

[0041] Example 2

[0042] This embodiment also relates to a multi-axle hybrid all-wheel drive chassis system, which differs from the first embodiment in that: Figure 2, and also includes a plurality of expansion shafts 004 installed on the chassis. The expansion shaft 004 is driven by a hub motor distribution. Similar to the second shaft 002 and the third shaft 003, the motor controller 0021 connected to the DC bus 0019 controls the speed and torque of the electric drive wheel 0023 of the hub motor 0022 to achieve electric drive and regenerative braking. The DC bus 0019 is a high-voltage DC bus. The hub motor 0022 is powered by the DC bus 0019 and directly drives the electric drive wheel 0023 of the expansion shaft 004. When braking, the hub motor 0022 can be used as a generator to recover the kinetic energy of the vehicle. The expansion shaft 004 can be driven in conjunction with the second shaft 002 or / and the third shaft 003, and the vehicle enters a combined electric drive mode. The expansion shaft 004 can also be driven in conjunction with the first shaft 001, and the vehicle enters a hybrid drive mode.

[0043] Example 3

[0044] The present embodiment also relates to a control method for a multi-axle hybrid all-wheel drive chassis system. A vehicle equipped with the chassis can operate in a variety of drive modes that can be automatically switched, including: redundant drive mode, extended-range mode, hybrid drive mode, combined electric drive mode and pure electric drive mode.

[0045] In the event of a failure in the vehicle's electric drive system, the clutch 0013 can be controlled to engage so that the power of the engine 0011 is directly transmitted to the first shaft 001 through the transmission 0014, the main reducer and the differential 0015. The gear position of the transmission 0014 is adjusted according to the vehicle speed and complex conditions to meet the normal driving needs of the vehicle and optimize the fuel economy of the vehicle.

[0046] When the power battery is low on power, the clutch 0013 of the first shaft can be disconnected to allow the engine 0011 and the ISG motor 0012 to form a generator set to charge the battery pack 0020; the clutch 0013 of the first shaft 001 can also be closed to allow the engine 0011 to output additional power to drive the first shaft 001 to work during the power generation process; the ISG motor 0012 of the first shaft and the hub motors 0022 of the second and third shafts can be used for regenerative braking.

[0047] Depending on the vehicle carrying conditions, a pure electric drive mode can be adopted in which only the third axis 003, or only the second axis 002, or only one extended axis 004 works, or a pure electric drive mode of multi-axis joint drive (the second axis and the third axis, or the second axis, the third axis and the extended axis, or the second axis and the extended axis, or the third axis and the extended axis) can be adopted. Alternatively, a hybrid drive mode can be adopted in which the first axis and some of the wheel hub motor distributed drive axis (the second axis, the third axis and some of the axis in the extended axis) work together.

[0048] The driving mode can be automatically switched through an automatic control algorithm based on the accelerator pedal signal, brake pedal signal, battery charge status, and vehicle speed information, or it can be manually switched through the joystick in the cab.

[0049] like Figure 3 , the automatic control algorithm includes:

[0050] Read the accelerator pedal signal, brake pedal signal, and mode switch handle signal to determine whether to enter automatic mode;

[0051] After entering the automatic mode, check the working status of the electric drive system. If the electric drive system has a fault that affects the normal driving of the vehicle, enter the redundant drive mode, and the engine directly drives the first shaft to enable the vehicle to drive normally;

[0052] If the electric drive system is normal, the power battery state of charge (SoC) is checked. If the SoC is lower than the minimum threshold SoC_low, the vehicle enters the extended range mode. In the extended range mode, the engine provides additional power to charge the power battery on the basis of meeting the power required for driving. If the battery state of charge is higher than the maximum threshold SoC_hig, the vehicle exits the extended range mode and stops generating electricity.

[0053] If the battery state of charge is not lower than the minimum threshold SoC_low, it is determined whether the electric drive power (i.e. the drive power of the second axis, the third axis and the extended axis hub motor) can meet the drive requirements. If the electric drive power of only one axis can meet the drive power of the whole vehicle, it is a single-axis pure electric drive mode. If multiple axes (for example: the second axis and the third axis) work together to meet the drive power, it is a combined electric drive mode. If the sum of the electric drive power of all axes cannot meet the drive requirements of the vehicle, the first axis also participates in the drive, and the vehicle operates in a hybrid drive mode.

[0054] If it is determined to be manual mode, the vehicle status is checked to determine whether the current vehicle status can meet the current mode. If so, the vehicle operates according to the mode selected by the joystick; otherwise, the vehicle enters automatic mode and operates according to the automatically selected drive mode, and prompts the driver on the dashboard or other display device that the current mode is not suitable and has been switched to automatic mode.

[0055] Example 4

[0056] The electronic device of the present invention includes a central processing unit (CPU), which can perform various appropriate actions and processes, such as a vehicle power domain controller and each axis area controller, according to control program instructions stored in a read-only memory (ROM) or control program instructions loaded from a storage unit into a random access memory (RAM). In the RAM, various programs and data required for the operation of the device can also be stored. The CPU, ROM and RAM are connected to each other via a bus. The input / output (I / O) interface is also connected to the bus.

[0057] Multiple components in the device are connected to the I / O interface, including: input units, such as operating handles or touch screens, etc.; output units, such as various types of displays, speakers, etc.; storage units, such as disks, optical disks, etc.; and communication units, such as CAN / FD, in-vehicle Ethernet, etc. The communication unit allows the device to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunication networks.

[0058] The processing unit performs the various methods and processes described above. For example, in some embodiments, the method can be implemented as a control program, which is tangibly contained in a machine-readable medium, such as a storage unit. In some embodiments, part or all of the control program can be loaded and / or installed on the device via a ROM and / or a communication unit. When the control program is loaded into RAM and executed by the CPU, one or more steps of the method described above can be performed. Alternatively, in other embodiments, the CPU can be configured to execute the method in any other appropriate manner (e.g., by means of firmware).

[0059] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0060] The program code for implementing the method of the present invention can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code can be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0061] In the context of the present invention, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or apparatus. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any suitable combination of the foregoing.

[0062] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A multi-axle hybrid all-wheel drive chassis system, characterized in that: The chassis system comprises a first shaft (001), a second shaft (002), a third shaft (003) and a plurality of extension shafts (004) which are sequentially mounted on the chassis, wherein the first shaft (001) is driven by a hybrid power system and is equipped with a hybrid power drive axle, and the hybrid power drive axle comprises an engine (0011), an ISG motor (0012), a clutch (0013), a transmission (0014), a main reducer and a differential (0015) and a driving wheel (0016); The second shaft (002), the third shaft (003) and the plurality of extension shafts (004) are all distributedly driven by wheel hub motors, and the electric drive and regenerative braking are realized by controlling the rotation speed and torque of the electric drive wheel (0023) of the wheel hub motor (0022) through the motor controller (0021).

2. The multi-axle hybrid all-wheel drive chassis system according to claim 1, characterized in that: The engine (0011) and the ISG motor (0012) adopt a parallel oil-electric coupling scheme, and the power of the first shaft (001) is transmitted to the transmission (0014) via the engine (0011) and the ISG motor (0012), and then transmitted to the driving wheel (0016) through the main reducer and the differential (0015); A clutch (0013) is arranged between the ISG motor (0012) and the transmission (0014) for switching the hybrid mode; When the electric drive system fails, by controlling the engagement of the clutch (0013), the power of the engine (0011) is directly transmitted to the drive wheel (0016) of the first shaft (001) through the transmission (0014), the main reducer and the differential (0015).

3. The multi-axle hybrid all-wheel drive chassis system according to claim 1, characterized in that: The chassis system also includes a DC bus (0019) and a battery pack (0020); The ISG motor (0012) is connected to the DC bus (0019) via a controller and an inverter (0018), and supplies power to the DC bus (0019) and the battery pack (0020) in a power generation mode; The DC bus (0019) relies on the battery pack (0020) to maintain and balance the bus voltage.

4. The multi-axle hybrid all-wheel drive chassis system according to claim 3, characterized in that: The wheel hub motor (0022) is powered by a DC bus (0019) and directly drives the electric drive wheel (0023) to work; during braking, the wheel hub motor (0022) acts as a generator to recover the kinetic energy of the vehicle.

5. The multi-axle hybrid all-wheel drive chassis system according to claim 1, characterized in that: The ISG motor (0012) and the engine (0011) form a generator set to supply power to the DC bus (0019).

6. A control method using a multi-axle hybrid all-wheel drive chassis system according to any one of claims 1 to 5, characterized in that: The drive control method comprises the following steps: Determine whether to enter the automatic mode according to the accelerator pedal signal, the brake pedal signal and the mode switching handle signal; The vehicle enters the automatic mode and works according to the automatically selected driving mode to check the working status of the electric drive system. If the electric drive system has a fault that affects the normal driving of the vehicle, it enters the redundant driving mode and the engine directly drives the first axle to enable the vehicle to drive normally. If the electric drive system is normal, the power battery state of charge is checked. If the battery state of charge is lower than the minimum threshold SoC_low, the extended range mode is entered; If the battery state of charge is not lower than the minimum threshold SoC_low, it is determined whether the electric drive power can meet the driving requirements. If the electric drive power of only one axle can meet the driving power of the entire vehicle, it is a single-axis pure electric drive mode; if the electric drive power of multiple axles working together can meet the driving power, it is a combined electric drive mode; if the sum of the electric drive power of all axles cannot meet the driving requirements of the vehicle, the first axle also participates in the drive, and the vehicle operates in a hybrid drive mode.

7. The control method according to claim 6, characterized in that: The method also includes: if it is determined to be a manual mode, checking the vehicle state and determining whether the current vehicle state can meet the current mode. If so, the vehicle operates according to the mode selected by the joystick; if not, the vehicle operates according to the automatically selected drive mode.

8. The control method according to claim 6, characterized in that: The method also includes: in the extended-range mode, the engine provides additional power to charge the power battery on the basis of meeting the power required for driving; if the battery state of charge is higher than the maximum threshold SoC_hig, the extended-range mode is exited and the engine stops generating electricity.

9. The control method according to claim 6, characterized in that: The method also includes: when the battery is low on power, disconnecting the clutch of the first shaft, and the engine and ISG motor form a generator set to charge the battery pack; or closing the clutch of the first shaft, and the engine outputs additional power to drive the first shaft to work during the power generation process.

10. An electronic device, comprising a memory and a processor, wherein a control program is stored in the memory, wherein: When the processor executes the program, the method according to any one of claims 6 to 9 is implemented.

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