Single-double-axle working mode control method and system for double-electric-drive-axle vehicle

Abstract

The invention discloses a single-double-axle working mode control method and system for a double-electric-drive-axle vehicle, and belongs to the technical field of vehicle control. The method comprises the steps that a double-axle working mode is adopted for starting to drive the double-electric-drive-axle vehicle to conduct double-axle work; the current gear state, the current vehicle speed, the whole vehicle demand torque, the motor temperature and the electric drive axle fault state of the double-electric-drive-axle vehicle are obtained; according to the current gear state, the current vehicle speed, the whole vehicle demand torque, the motor temperature and the electric drive axle fault state, whether the double-electric-drive-axle vehicle switches a single-axle working mode or not is controlled; if the double-electric-drive-axle vehicle enters the single-axle working mode, a working axle of the single-axle working mode of the double-electric-drive-axle vehicle is selected according to the electric-drive-axle fault state and the motor temperature, the working axle is used for driving the double-electric-drive-axle vehicle to conduct single-axle working, and the single-axle working mode of the double-electric-drive-axle vehicle is obtained according to the obtained accumulated mileage. And controlling whether to switch the working bridge or not in the single-bridge working mode of the double-electric-drive-bridge vehicle. The service life of the gear shifting mechanism can be prolonged, and the reliability of a vehicle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of whole vehicle control, in particular to a single / dual axle working mode control method and system for a dual electric axle vehicle. BACKGROUND

[0002] With the acceleration of the electrification process of new energy commercial vehicles, the user vehicle scene has also expanded from closed short reversing, medium and short distance transportation scene to medium and long distance transportation scene. The electric axle drive scheme is particularly suitable for medium and long distance transportation vehicles due to its light weight, high efficiency, and saving of vehicle layout space. Compared with traditional internal combustion engine vehicles, new energy commercial vehicles equipped with two electric axles can realize single axle driving and dual axle driving. At present, there are mainly two ways to realize single / dual axle switching, one is manual switch control switching, and the other is whole vehicle controller algorithm control switching. Both methods have advantages and disadvantages.

[0003] Among them, there are many ways to realize algorithm control single / dual axle switching, but the current public control method only focuses on controlling single / dual axle switching from the perspective of economy and power, ignoring the adverse effects of frequent single / dual axle switching on the service life of the gear shifting mechanism and the risk of demagnetization caused by high temperature of the motor due to long time full load work of single axle, reducing the reliability and service life of the vehicle. Therefore, it is necessary to comprehensively control the single / dual axle working mode from the aspects of economy, power, reliability, safety, etc. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, provide a single / dual axle working mode control method and system for a dual electric axle vehicle, which can realize effective switching of single / dual axle working, prolong the service life of the gear shifting mechanism, and effectively switch the working axle of single axle working, thereby increasing the reliability and service life of the vehicle.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: On the one hand, the present application provides a single / dual axle working mode control method for a dual electric axle vehicle, comprising: In the dual axle working mode, the current gear state, current vehicle speed, whole vehicle demand torque, motor temperature and electric axle fault state of the dual electric axle vehicle are obtained; wherein the dual axle working mode is adopted to drive the dual electric axle vehicle for dual axle working at start-up; According to the current gear state, current vehicle speed, whole vehicle demand torque, motor temperature and electric axle fault state, whether to control the dual electric axle vehicle to switch to single axle working mode is determined; If the dual-motor-drive axle vehicle enters the single-axle working mode, according to the motor-drive axle fault state and the motor temperature, a working axle of the single-axle working mode of the dual-motor-drive axle vehicle is selected, the dual-motor-drive axle vehicle is driven by the working axle to work in the single-axle mode, and whether to switch the working axle in the single-axle working mode of the dual-motor-drive axle vehicle is controlled according to the obtained cumulative mileage.

[0006] Optionally, the current gear state of the dual-motor-drive axle vehicle includes forward gear, neutral gear and reverse gear. The motor temperature includes the middle-axle motor temperature and the rear-axle motor temperature. The motor-drive axle fault state includes middle-axle motor fault, middle-axle motor no fault, rear-axle motor fault and rear-axle motor no fault. The cumulative mileage includes middle-axle cumulative mileage and rear-axle cumulative mileage.

[0007] Optionally, according to the current gear state, the current vehicle speed, the whole vehicle demand torque, the motor temperature and the motor-drive axle fault state, whether to switch the single-axle working mode of the dual-motor-drive axle vehicle is controlled, including: If the current gear state is forward gear, the current vehicle speed is not less than a first preset vehicle speed threshold and lasts for a first preset vehicle speed time, the whole vehicle demand torque is not greater than a first preset torque threshold and lasts for a first preset torque time, the middle-axle motor temperature or the rear-axle motor temperature is not greater than a first preset temperature threshold and lasts for a first preset temperature time, and the middle-axle motor is no fault or the rear-axle motor is no fault, the dual-motor-drive axle vehicle is controlled to switch to the single-axle working mode; otherwise, the dual-motor-drive axle vehicle is controlled to keep the dual-axle working mode.

[0008] Optionally, according to the motor-drive axle fault state and the motor temperature, a working axle of the single-axle working mode of the dual-motor-drive axle vehicle is selected, the dual-motor-drive axle vehicle is driven by the working axle to work in the single-axle mode, and whether to switch the working axle in the single-axle working mode of the dual-motor-drive axle vehicle is controlled according to the obtained cumulative mileage, including: If the rear-axle motor is no fault and the rear-axle motor temperature is not greater than a second preset temperature threshold, the rear axle is selected as the working axle of the single-axle working mode of the dual-motor-drive axle vehicle, and the dual-motor-drive axle vehicle is driven by the rear axle to work in the single-axle mode. If the difference between the rear-axle cumulative mileage and the middle-axle cumulative mileage is not less than a preset mileage, the middle-axle motor is no fault and the middle-axle motor temperature is not greater than the second preset temperature threshold, the middle axle is selected as the working axle of the single-axle working mode of the dual-motor-drive axle vehicle, and the dual-motor-drive axle vehicle is driven by the middle axle to work in the single-axle mode until the middle-axle cumulative mileage is the same as the rear-axle cumulative mileage, and the rear-axle motor fault state and the rear-axle motor temperature are re-determined; otherwise, the dual-motor-drive axle vehicle is continuously driven by the rear axle to work in the single-axle mode. If the rear axle motor is faulty or the temperature of the rear axle motor is greater than the second preset temperature threshold, the middle axle motor is not faulty, and the temperature of the middle axle motor is not greater than the second preset temperature threshold, the middle axle is used as the working axle of the single axle working mode of the dual-motor-drive axle vehicle, and the dual-motor-drive axle vehicle is driven by the middle axle to work in the single axle mode. If the difference between the cumulative mileage of the middle axle and the cumulative mileage of the rear axle is not less than the preset mileage, the rear axle motor is not faulty, and the temperature of the rear axle motor is not greater than the second preset temperature threshold, the rear axle is used as the working axle of the single axle working mode of the dual-motor-drive axle vehicle, and the dual-motor-drive axle vehicle is driven by the rear axle to work in the single axle mode until the cumulative mileage of the rear axle is the same as the cumulative mileage of the middle axle, and the motor fault state of the middle axle and the temperature of the rear axle motor are re-judged; otherwise, the dual-motor-drive axle vehicle is continuously driven by the middle axle to work in the single axle mode. If the rear axle motor is faulty or the temperature of the rear axle motor is greater than the second preset temperature threshold, and the middle axle motor is faulty or the temperature of the middle axle motor is greater than the second preset temperature threshold, the dual-motor-drive axle vehicle is controlled to switch to the dual axle working mode.

[0009] Optionally, after the dual-motor-drive axle vehicle is driven by the working axle to work in the single axle mode, the method further comprises: If the current gear state is neutral or reverse, the current vehicle speed is less than the second preset vehicle speed threshold and lasts for the second preset vehicle speed time, the whole vehicle demand torque is greater than the second preset torque threshold and lasts for the second preset torque time, the temperatures of the middle axle motor and the rear axle motor are greater than the second preset temperature threshold and lasts for the second preset temperature time, or the middle axle motor is faulty and the rear axle motor is faulty, the dual-motor-drive axle vehicle is controlled to switch to the dual axle working mode; otherwise, the dual-motor-drive axle vehicle is controlled to remain in the single axle working mode.

[0010] Optionally, the first preset vehicle speed threshold is greater than the second preset vehicle speed threshold.

[0011] Optionally, the second preset torque threshold is between the rated torque and the peak torque of the single axle motor, and the second preset torque threshold is less than 90% of the peak torque.

[0012] In a second aspect, the present application provides a single-dual axle working mode control system of a dual-motor-drive axle vehicle, comprising: A vehicle parameter acquisition module is configured to: in the dual axle working mode, acquire the current gear state, the current vehicle speed, the whole vehicle demand torque, the motor temperature, and the motor fault state of the dual-motor-drive axle vehicle; and the dual-motor-drive axle vehicle is driven by the dual axle working mode to work in the dual axle mode at start-up. A working mode switching module is configured to: according to the current gear state, the current vehicle speed, the whole vehicle demand torque, the motor temperature, and the motor fault state, control whether the dual-motor-drive axle vehicle switches to the single axle working mode. The single-bridge working module is used for: if the double-electric-drive-bridge vehicle enters a single-bridge working mode, then according to the electric-drive-bridge fault state and the motor temperature, a working bridge of the single-bridge working mode of the double-electric-drive-bridge vehicle is selected, and the double-electric-drive-bridge vehicle is driven by the working bridge to work in the single-bridge working mode.

[0013] In a third aspect, the present application provides a computer readable storage medium, having stored thereon a computer program, which when executed by a processor implements the steps of the method according to the first aspect.

[0014] In a fourth aspect, the present application provides a computer device, comprising a processor and a storage medium; The storage medium is used for storing instructions; The processor is used for operating according to the instructions to execute the method according to the first aspect.

[0015] Compared with the prior art, the present application has the following beneficial effects: The present application comprehensively considers economy, power, reliability, safety and other aspects to realize intelligent control of single-bridge and double-bridge working modes, reduces the adverse effects of frequent switching of single-bridge and double-bridge on the service life of the gear shifting mechanism, and the risk of demagnetization caused by high temperature of the motor due to long-time full-load work of the single bridge, and improves the reliability and service life of the vehicle; in the single-bridge working mode, through the selection and judgment method of the working bridge, the working bridge motor temperature is kept within a controllable temperature range at all times, and the cumulative mileage is balanced, and the service life of the vehicle is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure shows a flowchart of the single-bridge and double-bridge working mode control method of the double-electric-drive-bridge vehicle in an embodiment of the present application; Figure 2 The figure shows a flowchart of the single-bridge working mode of the double-electric-drive-bridge vehicle in an embodiment of the present application. DETAILED DESCRIPTION

[0017] The technical solution of the present application will be described in detail below by means of the drawings and specific embodiments, and it should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of the present application, and are not limitations of the technical solution of the present application, and the technical features in the embodiments and the embodiments can be combined with each other without conflict.

[0018] The term "and / or", only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / ", generally represents that the front and rear associated objects are in an "or" relationship.

[0019] Embodiment 1

[0020] As Figure 1 shown, the embodiment provides a single-double axle working mode control method of a dual electric drive axle vehicle, comprising the following steps: Step one: the default dual axle working mode is adopted to drive the dual electric drive axle vehicle to work in dual axle mode after power-on starting.

[0021] Step two: after the vehicle starts running, the current gear state, current vehicle speed, vehicle demand torque, motor temperature and electric drive axle fault state of the dual electric drive axle vehicle are obtained.

[0022] Step three: according to the current gear state, current vehicle speed, vehicle demand torque, motor temperature and electric drive axle fault state, whether the dual electric drive axle vehicle is controlled to switch to single axle working mode is determined, that is, when the conditions of single axle working mode are met, the dual electric drive axle vehicle enters single axle working mode, otherwise it remains in dual axle working mode, and when the conditions of exiting single axle working mode are met, the dual electric drive axle vehicle exits single axle working mode and enters dual axle working mode, which is specifically: The current gear state of the dual electric drive axle vehicle includes forward gear, neutral gear and reverse gear; the motor temperature includes the middle axle motor temperature and the rear axle motor temperature; the electric drive axle fault state includes middle axle motor fault, middle axle motor no fault, rear axle motor fault and rear axle motor no fault; the cumulative mileage includes middle axle cumulative mileage and rear axle cumulative mileage; the vehicle demand torque includes vehicle demand driving torque and vehicle demand electric braking torque.

[0023] If the current gear state is forward gear, the current vehicle speed is not less than a first preset vehicle speed threshold and lasts for a first preset vehicle speed time, the vehicle demand torque is not greater than a first preset torque threshold and lasts for a first preset torque time, the middle axle motor temperature or the rear axle motor temperature is not greater than a first preset temperature threshold and lasts for a first preset temperature time, and the middle axle motor has no fault or the rear axle motor has no fault, the dual electric drive axle vehicle is controlled to switch to single axle working mode; otherwise, the dual electric drive axle vehicle is controlled to remain in dual axle working mode. In a specific embodiment, the current gear state, current vehicle speed, vehicle demand torque, motor temperature and electric drive axle fault state are detected simultaneously, and if the above conditions are met simultaneously, the single axle working mode is entered, and if any of the above conditions is not met, the dual axle working mode is continued to be maintained until all the conditions are met and the single axle working mode is entered.

[0024] If the current gear state is neutral or reverse, the current vehicle speed is less than the second preset vehicle speed threshold and lasts for the second preset vehicle speed time, the whole vehicle demand torque is greater than the second preset torque threshold and lasts for the second preset torque time, the mid-axle motor temperature and the rear-axle motor temperature are greater than the second preset temperature threshold and lasts for the second preset temperature time, or the mid-axle motor fault and the rear-axle motor fault, the dual-motor-drive axle vehicle is controlled to switch the dual-axle working mode; otherwise, the dual-motor-drive axle vehicle is controlled to keep the single-axle working mode. In a specific embodiment, after entering the single-axle working mode, the above-mentioned setting condition judgment for exiting the single-axle working mode is performed, if the above-mentioned setting conditions are not all met, the single-axle working mode is continued to be kept, if any of the above-mentioned setting conditions is met, the single-axle working mode is exited and the dual-axle working mode is entered.

[0025] In the embodiment, the first preset vehicle speed threshold is greater than the second preset vehicle speed threshold, so as to avoid frequent entering and exiting the single-axle mode and reduce the number of gear shifts; the second preset torque threshold is between the rated torque and the peak torque of the single-axle motor, and close to the peak torque but not greater than 90% of the peak torque, so as to avoid the motor life attenuation caused by long time full torque load; the first preset temperature threshold and the second preset temperature threshold are set to avoid irreversible demagnetization caused by motor overheating.

[0026] Step four: if the dual-motor-drive axle vehicle enters the single-axle working mode, the working axle of the dual-motor-drive axle vehicle in the single-axle working mode is selected according to the motor fault state and the motor temperature, the dual-motor-drive axle vehicle is driven by the working axle to work in the single-axle mode, and whether to switch the working axle of the dual-motor-drive axle vehicle in the single-axle working mode is controlled according to the cumulative mileage, as shown in the following table: Figure 2 Specifically, as shown in the following table: After entering the single-axle working mode, firstly, whether to select the rear axle as the working axle is determined according to the rear-axle motor fault state and the rear-axle motor temperature, if the rear-axle motor has no fault and the rear-axle motor temperature is not greater than the second preset temperature threshold, the rear axle is selected as the working axle of the dual-motor-drive axle vehicle in the single-axle working mode, and the dual-motor-drive axle vehicle is driven by the rear axle to work in the single-axle mode; If the difference between the cumulative mileage of the rear axle and the cumulative mileage of the mid-axle is not less than the preset mileage, whether to switch the mid-axle as the working axle is determined according to the mid-axle motor fault state and the mid-axle motor temperature; otherwise, the dual-motor-drive axle vehicle is continued to be driven by the rear axle to work in the single-axle mode; If the mid-axle motor has no fault and the mid-axle motor temperature is not greater than the second preset temperature threshold, the mid-axle is selected as the working axle of the dual-motor-drive axle vehicle in the single-axle working mode, and the dual-motor-drive axle vehicle is driven by the mid-axle to work in the single-axle mode, until the cumulative mileage of the mid-axle and the cumulative mileage of the rear axle are the same, and whether to select the rear axle as the working axle is determined according to the rear-axle motor fault state and the rear-axle motor temperature; otherwise, the dual-motor-drive axle vehicle is continued to be driven by the rear axle to work in the single-axle mode; wherein some rear-axle motor faults can be self-recovered.

[0027] Then, if the rear axle motor fails or the rear axle motor temperature is greater than the second preset temperature threshold, the rear axle does not meet the condition of being designated as the working axle, and the rear axle motor failure state and the rear axle motor temperature determine whether to switch the middle axle as the working axle. If the middle axle motor is not faulty and the middle axle motor temperature is not greater than the second preset temperature threshold, the middle axle is used as the working axle of the single axle working mode of the dual-motor-drive axle vehicle, and the dual-motor-drive axle vehicle is driven by the middle axle for single axle working; If the difference between the cumulative mileage of the middle axle and the cumulative mileage of the rear axle is not less than the preset mileage, the rear axle motor failure state and the rear axle motor temperature determine whether to switch the rear axle as the working axle; otherwise, the dual-motor-drive axle vehicle is continuously driven by the middle axle for single axle working. If the rear axle motor is not faulty and the rear axle motor temperature is not greater than the second preset temperature threshold, the rear axle is used as the working axle of the single axle working mode of the dual-motor-drive axle vehicle, and the dual-motor-drive axle vehicle is driven by the rear axle for single axle working until the cumulative mileage of the rear axle and the cumulative mileage of the middle axle are the same, and the rear axle motor failure state and the rear axle motor temperature are re-determined to determine whether to select the rear axle as the working axle; otherwise, the dual-motor-drive axle vehicle is continuously driven by the middle axle for single axle working.

[0028] The cycle is repeated.

[0029] Finally, if the rear axle motor fails or the rear axle motor temperature is greater than the second preset temperature threshold and the middle axle motor fails or the middle axle motor temperature is greater than the second preset temperature threshold, the dual-motor-drive axle vehicle is switched to the dual axle working mode and exits the single axle working mode.

[0030] In this embodiment, the preset speed threshold of the single / dual axle working mode is different, and the preset speed time can be set to be the same or different, generally the same speed time is set, the preset torque threshold and the preset temperature threshold of the single axle working mode are lower than the preset torque threshold and the preset temperature threshold of the dual axle working mode, and the preset torque time and the preset temperature time of the single / dual axle working mode can be set to be the same or different, generally the same torque time and temperature time are set.

[0031] In the application of this embodiment, the economy, power, reliability, safety and other aspects are comprehensively considered to realize intelligent control of the single / dual axle working mode, reduce the adverse effects of frequent switching of the single / dual axle on the service life of the gear shifting mechanism, and reduce the risk of demagnetization caused by high temperature of the motor due to long time full load working of the single axle, thereby improving the reliability and service life of the vehicle.

[0032] Embodiment 2

[0033] Based on embodiment 1, this embodiment introduces an experimental example of a single / dual axle working mode control method of a dual-motor-drive axle vehicle: The default is dual-axle working mode after power-on, and the current gear state, current vehicle speed, vehicle demand torque, motor temperature, and electric drive axle fault state are detected. If the following conditions are met, the single-axle working mode is entered. If any of the following conditions is not met, the dual-axle working mode is maintained until all conditions are met, and the single-axle working mode is entered. The following five conditions are met to enter the single-axle working mode: a) the current gear state is forward gear; b) the current vehicle speed is greater than or equal to 55 km / h for 2 seconds; c) the vehicle demand torque is less than or equal to 0.9 times the peak torque of a single motor for 2 seconds; d) the temperature of the middle axle motor or the temperature of the rear axle motor is less than or equal to 110°C for 2 seconds; e) the middle axle motor has no fault or the rear axle motor has no fault.

[0034] After entering the single-axle working mode, the following conditions are judged to exit the single-axle working mode. If none of the following conditions is met, the single-axle working mode is maintained. If any of the following conditions is met, the single-axle working mode is exited and the dual-axle working mode is entered. Any one of the following five conditions is met to exit the single-axle working mode and enter the dual-axle working mode: a) the current gear state is neutral or reverse gear; b) the current vehicle speed is less than 50 km / h for 2 seconds; c) the vehicle demand torque is greater than 0.9 times the peak torque of a single motor for 2 seconds; d) the temperature of the middle axle motor and the temperature of the rear axle motor are greater than 120°C for 2 seconds; e) the middle axle motor has a fault and the rear axle motor has a fault.

[0035] The specific working process of entering the single-axle working mode is referred to in Example 1, which is not repeated here.

[0036] Example 3

[0037] Based on Example 1 or 2, this embodiment introduces a single-dual axle working mode control system for a dual electric drive axle vehicle, comprising: a vehicle parameter acquisition module, configured to: in dual-axle working mode, acquire the current gear state, current vehicle speed, vehicle demand torque, motor temperature, and electric drive axle fault state of the dual electric drive axle vehicle; wherein the dual-axle working mode is adopted to drive the dual electric drive axle vehicle to work in dual-axle mode at start-up; a working mode switching module, configured to: control whether the dual electric drive axle vehicle switches to single-axle working mode according to the current gear state, current vehicle speed, vehicle demand torque, motor temperature, and electric drive axle fault state; The single-bridge working module is configured to: if the double-electric-drive-bridge vehicle enters a single-bridge working mode, select a working bridge of the double-electric-drive-bridge vehicle in the single-bridge working mode according to a fault state of the electric drive bridge and a motor temperature, and drive the double-electric-drive-bridge vehicle to work in the single-bridge working mode by using the working bridge.

[0038] The specific function implementation of each module is described in the related content in the method of Embodiment 1, which is not repeated here.

[0039] Embodiment 4

[0040] This embodiment introduces a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the steps in the method of Embodiment 1 or 2.

[0041] Embodiment 5

[0042] This embodiment introduces a computer device, which includes a processor and a storage medium. The storage medium is configured to store instructions. The processor is configured to operate according to the instructions to execute the method of Embodiment 1 or 2.

[0043] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can be in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can be in the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0044] The present application is described with reference to flowcharts and / or block diagrams according to the methods, devices (systems), and computer program products of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce the functions described in the flowcharts and / or block diagrams. Figure 1 The function of the device specified in one flow or multiple flows and / or blocks Figure 1 The function of the device specified in one flow or multiple flows and / or blocks

[0045] These computer program instructions can also be stored in a computer readable storage medium that can guide the computer or other programmable data processing devices to work in a specific way, so that the instructions stored in the computer readable storage medium produce the manufactured products including instruction devices, which implement the functions described in the flowcharts and / or block diagrams.Figure 1 one or more processes and / or functions described in one or more blocks. Figure 1 one or more blocks.

[0046] These computer program instructions can also be loaded into computer or other programmable data processing devices, so that a series of operation steps are performed on the computer or other programmable data processing devices to generate a computer implemented process, so that the instructions executed on the computer or other programmable data processing devices provide steps for implementing the function described in one or more processes and / or functions described in one or more blocks. Figure 1 one or more processes and / or functions described in one or more blocks. Figure 1 one or more blocks.

[0047] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative, but not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, which are all within the protection of the present application.

Claims

1. A method for controlling single and double bridge working modes of a dual electric drive axle vehicle, characterized in that: include: In the dual-axle working mode, the current gear status, current vehicle speed, vehicle required torque, motor temperature and electric axle fault status of the dual-electric drive axle vehicle are obtained; wherein, the dual-axle working mode is adopted for starting to drive the dual-electric drive axle vehicle to perform dual-axle operation; Controlling whether the dual electric drive axle vehicle switches to a single axle operating mode based on the current gear state, current vehicle speed, vehicle required torque, motor temperature, and electric drive axle fault state; If the dual-electric drive axle vehicle enters the single-bridge working mode, the working axle of the dual-electric drive axle vehicle's single-bridge working mode is selected according to the electric drive axle fault status and motor temperature, and the working axle is used to drive the dual-electric drive axle vehicle to perform single-bridge operation. Based on the accumulated mileage obtained, whether the working axle of the dual-electric drive axle vehicle is switched in the single-bridge working mode is controlled.

2. The single and double bridge working mode control method of a dual electric drive axle vehicle according to claim 1, characterized in that: The current gear state of the dual electric drive axle vehicle includes forward gear, neutral gear and reverse gear; The motor temperature includes the middle axle motor temperature and the rear axle motor temperature; The electric drive axle fault status includes middle axle motor fault, middle axle motor no fault, rear axle motor fault and rear axle motor no fault; The cumulative mileage includes the cumulative mileage of the middle bridge and the cumulative mileage of the rear bridge.

3. The single and double bridge working mode control method of a dual electric drive axle vehicle according to claim 2, characterized in that: Controlling whether a dual electric drive axle vehicle switches to a single axle operating mode based on the current gear state, current vehicle speed, vehicle required torque, motor temperature, and electric drive axle fault state includes: If the current gear state is forward gear, the current vehicle speed is not less than the first preset vehicle speed threshold and continues for the first preset vehicle speed time, the vehicle demand torque is not greater than the first preset torque threshold and continues for the first preset torque time, the middle axle motor temperature or the rear axle motor temperature is not greater than the first preset temperature threshold and continues for the first preset temperature time, and the middle axle motor has no fault or the rear axle motor has no fault, then the dual electric drive axle vehicle is controlled to switch to the single axle working mode; otherwise, the dual electric drive axle vehicle is controlled to maintain the dual axle working mode.

4. The single and double bridge working mode control method of a dual electric drive axle vehicle according to claim 2, characterized in that: Based on the electric drive axle fault status and motor temperature, the working axle of the dual electric drive axle vehicle in the single-bridge working mode is selected, and the working axle is used to drive the dual electric drive axle vehicle to perform single-bridge operation. Based on the accumulated mileage obtained, whether the working axle of the dual electric drive axle vehicle in the single-bridge working mode is controlled, including: If the rear axle motor has no faults and the temperature of the rear axle motor is not greater than a second preset temperature threshold, the rear axle is used as the working axle of the single-axle working mode of the dual-electric drive axle vehicle, and the rear axle is used to drive the dual-electric drive axle vehicle to perform single-axle operation; If the difference between the accumulated mileage of the rear axle and the accumulated mileage of the middle axle is not less than the preset mileage, the middle axle motor has no faults, and the temperature of the middle axle motor is not greater than a second preset temperature threshold, the middle axle is used as the working axle in the single-axle working mode of the dual-electric drive axle vehicle, and the middle axle is used to drive the dual-electric drive axle vehicle to perform single-axle operation until the accumulated mileage of the middle axle is the same as the accumulated mileage of the rear axle, and the rear axle motor fault status and rear axle motor temperature are re-determined; otherwise, the rear axle continues to drive the dual-electric drive axle vehicle to perform single-axle operation; If the rear axle motor fails or the temperature of the rear axle motor is greater than a second preset temperature threshold, and the middle axle motor has no fault and the temperature of the middle axle motor is not greater than the second preset temperature threshold, the middle axle is used as the working axle in the single-axle working mode of the dual-electric drive axle vehicle, and the middle axle is used to drive the dual-electric drive axle vehicle to perform single-axle operation; If the difference between the accumulated mileage of the middle axle and the accumulated mileage of the rear axle is not less than the preset mileage, the rear axle motor has no faults, and the temperature of the rear axle motor is not greater than a second preset temperature threshold, the rear axle is used as the working axle in the single-axle working mode of the dual-electric drive axle vehicle, and the rear axle is used to drive the dual-electric drive axle vehicle to perform single-axle operation until the accumulated mileage of the rear axle is the same as the accumulated mileage of the middle axle, and the fault status of the middle axle motor and the temperature of the rear axle motor are re-determined; otherwise, the middle axle continues to be used to drive the dual-electric drive axle vehicle to perform single-axle operation; If the rear axle motor fails or the temperature of the rear axle motor is greater than the second preset temperature threshold, and the middle axle motor fails or the temperature of the middle axle motor is greater than the second preset temperature threshold, the dual electric drive axle vehicle is controlled to switch to the dual axle working mode.

5. The single and double bridge working mode control method of a dual electric drive axle vehicle according to claim 3, characterized in that: After using the working bridge to drive the dual electric drive bridge vehicle to perform single bridge work, it also includes: If the current gear state is neutral or reverse, the current vehicle speed is less than the second preset speed threshold and continues for the second preset speed time, the vehicle demand torque is greater than the second preset torque threshold and continues for the second preset torque time, the middle axle motor temperature and the rear axle motor temperature are greater than the second preset temperature threshold and continue for the second preset temperature time, or the middle axle motor and the rear axle motor fail, then the dual electric drive axle vehicle is controlled to switch to the dual-axle working mode; otherwise, the dual electric drive axle vehicle is controlled to maintain the single-axle working mode.

6. The single and double bridge working mode control method of a dual electric drive axle vehicle according to claim 5, characterized in that: The first preset vehicle speed threshold is greater than the second preset vehicle speed threshold.

7. The single and double axle working mode control method of a dual electric drive axle vehicle according to claim 5, characterized in that: The second preset torque threshold is between the rated torque and the peak torque of the single-bridge motor, and the second preset torque threshold is less than 90% of the peak torque.

8. A single-bridge and double-bridge working mode control system for a dual-electric drive axle vehicle, characterized in that: include: The vehicle parameter acquisition module is used to obtain the current gear status, current vehicle speed, vehicle required torque, motor temperature, and electric drive axle fault status of the dual electric drive axle vehicle in the dual-axle working mode; wherein, the dual-axle working mode is used to drive the dual electric drive axle vehicle to perform dual-axle operation when starting; A working mode switching module is used to control whether the dual electric drive axle vehicle switches to a single axle working mode according to the current gear state, current vehicle speed, vehicle required torque, motor temperature and electric drive axle fault state; The single-bridge working module is used to: if the dual-electric drive axle vehicle enters the single-bridge working mode, select the working bridge of the dual-electric drive axle vehicle's single-bridge working mode according to the electric drive axle fault status and motor temperature, and use the working bridge to drive the dual-electric drive axle vehicle to perform single-bridge operation.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer device, characterized in that: including processor and storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the method according to any one of claims 1 to 7.

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