Gear shifting control method and system for vehicle driven by double electric drive axles and new energy heavy truck
Through the gear shift control method of driving vehicles with dual electric drive axles, the problems of power loss and safety hazards of new energy heavy truck electric drive axles during gear shifting are solved, achieving a safer and more comfortable driving experience.
Patent Information
- Application Number
- CN202510387895.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2025-05-23
AI Technical Summary
The electric drive axles of existing new energy heavy trucks cannot output torque when shifting gears, resulting in loss of power and may cause the vehicle to drive in different states of the middle and rear axles, posing safety hazards.
The shift control method of the dual electric drive axle drive vehicle is adopted to obtain the gear signal of the shift lever, determine the signal type and execute the corresponding shift mode. In automatic transmission mode, the middle axle is preferred to control the shifting operation of the gear shifting operation and lock the shifting function of the rear axle when the gear is lowered. When the gear shifting operation is lowered, the rear axle is preferred to control the shifting operation and lock the shifting function of the middle axle. In manual transmission mode, the gear balance operation is performed to ensure that the gears of the middle axle and the rear axle are consistent.
It effectively avoids power loss during gear shifting, improves vehicle driving safety, and optimizes the driver's driving experience.
Smart Images
Figure CN120024319A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of new energy vehicles, and relates to a gear shift control method and system for a dual electric drive axle driven vehicle, and a new energy heavy truck. Background Art
[0002] With the promotion of new energy vehicle policies and the development of the industrial chain, the market share of new energy vehicles is growing year by year. New energy vehicles have the advantages of low maintenance cost, low noise, high energy efficiency, good driving quality, and convenient maintenance. However, due to the short cruising range of the whole vehicle, the application scenarios of new energy vehicles are limited and they are mostly used for short-distance transportation.
[0003] Faced with the increasingly tense situation of energy, as one of the important ways to effectively alleviate the tense situation of fossil energy in the transportation field, new energy vehicles have been rapidly developed, especially in short-distance and medium-distance conditions such as reverse and urban operation. Under this condition, the new energy heavy truck market is rapidly approaching saturation, so the main engine manufacturers and parts manufacturers quickly focus on cross-city medium- and long-distance conditions such as trunk line operation, which has led to the vigorous development of electric drive axles. Various manufacturers have developed electric drive axles with various structures, but the electric drive axles designed and produced by some manufacturers cannot output torque during gear shifting due to hardware structure limitations, resulting in power loss when the vehicle shifts gears. At the same time, the manual gear has a lock function, which may cause the vehicle to drive in different gears of the middle and rear axles, posing a safety hazard. Summary of the invention
[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a dual electric drive axle driven vehicle shift control method, system and new energy heavy truck, which can improve the driving safety of the new energy heavy truck and optimize the driver's driving experience.
[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:
[0006] In a first aspect, the present invention provides a gear shift control method for a dual electric drive axle driven vehicle, comprising:
[0007] Obtaining the gear position signal of the gear lever and determining the signal type;
[0008] If the gear position signal is an automatic gear signal, the automatic gear shifting mode is executed, including: when upshifting, the middle axle of the vehicle is preferentially controlled to perform the gear shifting operation and the gear shifting function of the rear axle of the vehicle is locked; when downshifting, the rear axle of the vehicle is preferentially controlled to perform the gear shifting operation and the gear shifting function of the middle axle of the vehicle is locked;
[0009] If the gear signal is a manual gear signal, a manual gear shifting mode is executed, including: performing a gear balancing operation to make the gears of the middle axle and the rear axle consistent; and controlling the middle axle and the rear axle to perform a gear shifting operation.
[0010] Furthermore, when shifting up, the middle axle of the vehicle is preferentially controlled to perform the shifting operation and the shifting function of the rear axle of the vehicle is locked, including:
[0011] Sending upshift command to mid-bridge gearbox controller;
[0012] After receiving the command, the mid-bridge gearbox controller controls the mid-bridge motor to clear torque and adjust speed, and controls the mid-bridge gearbox to shift up;
[0013] After the mid-bridge upshift is completed, the mid-bridge motor will continue to twist and feed back the mid-bridge gear position to the vehicle controller;
[0014] Sending upshift command to rear axle transmission controller;
[0015] After receiving the command, the rear axle gearbox controller controls the rear axle motor to clear torque and adjust speed, and controls the rear axle gearbox to shift up;
[0016] After the rear axle is shifted up, the rear axle motor is still twisted and the rear axle gear position is fed back to the vehicle controller.
[0017] Furthermore, when downshifting, the rear axle of the vehicle is preferentially controlled to perform the shifting operation and the shifting function of the middle axle of the vehicle is locked, including:
[0018] Sending a downshift command to the rear axle transmission controller;
[0019] After receiving the command, the rear axle gearbox controller controls the rear axle motor to clear torque and adjust speed, and controls the rear axle gearbox to downshift;
[0020] After the rear axle downshifts, the rear axle motor still twists and feeds back the rear axle gear position to the vehicle controller;
[0021] Sending downshift command to mid-bridge gearbox controller;
[0022] After receiving the command, the mid-bridge gearbox controller controls the mid-bridge motor to clear torque and adjust speed, and controls the mid-bridge gearbox to downshift;
[0023] After the mid-bridge downshift is completed, the mid-bridge motor continues to twist and feeds back the mid-bridge gear position to the vehicle controller.
[0024] Further, controlling the middle axle and the rear axle to perform a gear shift operation includes:
[0025] Sending a shift instruction to the mid-axle gearbox controller and the rear-axle gearbox controller, the shift instruction including an upshift instruction or a downshift instruction;
[0026] After receiving the instruction, the middle axle gearbox controller and the rear axle gearbox controller control the middle axle motor and the rear axle motor to clear torque and adjust speed, and control the middle axle gearbox and the middle axle gearbox to shift gears;
[0027] After the middle axle and rear axle shift is completed, the middle axle motor and rear axle motor are still twisted, and the middle axle and rear axle gear positions are fed back to the vehicle controller.
[0028] Furthermore, the automatic shifting mode also includes: the vehicle instrument maintains displaying the gear position before the shifting until the gear positions of the middle axle and the rear axle are consistent.
[0029] Furthermore, the gear balancing operation includes:
[0030] Read the target gear position displayed on the vehicle instrument panel;
[0031] Comparing the difference between the current gear position of the middle axle and the target gear position, and the difference between the current gear position of the rear axle and the target gear position respectively;
[0032] A correction instruction is sent separately to the corresponding transmission controller that is inconsistent with the target gear.
[0033] In a second aspect, the present invention further provides a dual electric drive axle driven vehicle shift control system, comprising: a vehicle controller, and a shift lever, a middle axle and a rear axle connected to the vehicle controller;
[0034] The shift lever is used to send a gear position signal to the vehicle controller;
[0035] The middle bridge and the rear bridge are used to perform corresponding shifting operations according to the shifting instructions issued by the vehicle controller;
[0036] The vehicle controller is used to execute the gear shift control method for a dual electric drive axle driven vehicle described in the first aspect.
[0037] Further, the middle bridge includes: a middle bridge gearbox controller, a middle bridge motor and a middle bridge gearbox; the rear bridge includes: a rear bridge gearbox controller, a rear bridge motor and a rear bridge gearbox;
[0038] The mid-bridge gearbox controller is respectively connected to the vehicle controller, the mid-bridge motor and the mid-bridge gearbox;
[0039] The rear axle gearbox controller is connected to the vehicle controller, the rear axle motor and the rear axle gearbox respectively.
[0040] Furthermore, the vehicle controller is connected to an instrument of the vehicle; the instrument maintains displaying the gear position before the gear shift until the gear positions of the middle axle and the rear axle are consistent.
[0041] In a third aspect, the present invention further provides a new energy heavy-duty truck, comprising: the dual electric drive axle driven vehicle shift control system described in the second aspect, or the dual electric drive axle driven vehicle shift control method described in the first aspect.
[0042] Compared with the prior art, the present invention has the following beneficial effects:
[0043] The gear shift control method for a dual-electric drive axle driven vehicle provided by the present invention, in automatic gear mode, prioritizes the control of the middle axle to execute the gear shift operation and locks the gear shift function of the rear axle when shifting up, and prioritizes the control of the rear axle to execute the gear shift operation and locks the gear shift function of the middle axle when shifting down, thereby ensuring that the dual axles do not shift gears at the same time, so that the vehicle will not suffer power interruption due to gear shifting, thereby optimizing the driver's driving experience; in manual gear mode, gear balancing operation is used to avoid the motor overspeeding or forced gear shifting caused by long-term driving of the vehicle when the middle and rear axles are in different gear states, thereby improving the driving safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS
[0044] Figure 1 A schematic flow chart of a gear shift control method for a dual electric drive axle driven vehicle provided by an embodiment of the present invention;
[0045] Figure 2 It is a schematic diagram of the upshift control process of the middle axle and the rear axle in the automatic shift mode in an embodiment of the present invention;
[0046] Figure 3 It is a schematic diagram of the downshift control flow of the middle axle and the rear axle in the automatic shift mode in an embodiment of the present invention;
[0047] Figure 4 The figure is a schematic diagram of the shift control flow of the middle axle and the rear axle in the manual shift mode in an embodiment of the present invention. DETAILED DESCRIPTION
[0048] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. The embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.
[0049] The term "and / or" herein is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " herein generally indicates that the front and back associated objects are in an "or" relationship. The orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, and is only used to explain the relative position relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure / application.
[0050] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.
[0052] Embodiment 1:
[0053] like Figures 1 to 4 As shown, an embodiment of the present invention provides a gear shift control method for a dual electric drive axle driven vehicle. Figure 1 The flowchart is a schematic diagram of the shift control method for a dual electric drive axle driven vehicle. This flowchart only shows the logical sequence of the method described in this embodiment. Under the premise of no conflict, in other possible embodiments of the present invention, different Figure 1 The steps shown or described are accomplished in the order shown.
[0054] See also Figure 1 The method of the embodiment of the present invention specifically includes the following steps:
[0055] Step 1: Obtain the gear position signal of the shift lever and determine the signal type.
[0056] The gear position signal types of the gear shift lever are automatic gear signal and manual gear signal.
[0057] Step 2: If the gear signal is an automatic gear signal, the vehicle controller executes an automatic gear shifting mode, including: when upshifting, the vehicle's middle axle is preferentially controlled to perform a gear shifting operation and the gear shifting function of the vehicle's rear axle is locked; when downshifting, the vehicle's rear axle is preferentially controlled to perform a gear shifting operation and the gear shifting function of the vehicle's middle axle is locked.
[0058] The vehicle type targeted by the present invention is a new energy heavy truck with dual electric drive axles and power interruption of the electric drive axles. The dual electric drive axles of the vehicle are the middle axle and the rear axle, wherein the middle axle includes: a middle axle gearbox controller, a middle axle motor and a middle axle gearbox, etc.; the rear axle includes: a rear axle gearbox controller, a rear axle motor and a rear axle gearbox, etc.
[0059] Among them, Figure 2 As shown, when shifting up, the middle axle of the vehicle is preferentially controlled to perform the shifting operation and the shifting function of the rear axle of the vehicle is locked, including:
[0060] The shift-up command is sent to the mid-axle gearbox controller; after receiving the command, the mid-axle gearbox controller controls the mid-axle motor to clear torque and adjust speed, and controls the mid-axle gearbox to shift up; after the mid-axle shift-up is completed, the mid-axle motor returns torque and feeds back the mid-axle gear position to the vehicle controller; the shift-up command is sent to the rear-axle gearbox controller; after receiving the command, the rear-axle gearbox controller controls the rear-axle motor to clear torque and adjust speed, and controls the rear-axle gearbox to shift up; after the rear-axle shift-up is completed, the rear-axle motor returns torque and feeds back the rear-axle gear position to the vehicle controller.
[0061] like Figure 3 As shown, when downshifting, the rear axle of the vehicle is preferentially controlled to perform the shifting operation and the shifting function of the middle axle of the vehicle is locked, including:
[0062] The downshift command is sent to the rear axle gearbox controller; after receiving the command, the rear axle gearbox controller controls the rear axle motor to clear torque and adjust the speed, and controls the rear axle gearbox to downshift; after the rear axle downshift is completed, the rear axle motor returns torque and feeds back the rear axle gear position to the vehicle controller; the downshift command is sent to the mid-axle gearbox controller, and after receiving the command, the mid-axle gearbox controller controls the mid-axle motor to clear torque and adjust the speed, and controls the mid-axle gearbox to downshift; after the mid-axle downshift is completed, the mid-axle motor returns torque and feeds back the mid-axle gear position to the vehicle controller.
[0063] The automatic shifting mode also includes: when it is detected that the gear positions of the middle bridge and the rear bridge are inconsistent, the vehicle instrument maintains the display of the gear position before the shift until the gear positions of the middle bridge and the rear bridge are restored to be consistent.
[0064] For example, as shown in Table 1 below, when shifting up, the gear position displayed by the instrument is consistent with the gear position of the rear axle; as shown in Table 2 below, when shifting down, the gear position displayed by the instrument is consistent with the gear position of the middle axle.
[0065] Table 1 Instrument gear position display logic when shifting up in automatic shift mode
[0066]
[0067] Table 2 Instrument gear position display logic when downshifting in automatic shift mode
[0068]
[0069] Step 3: If the gear signal is a manual gear signal, the vehicle controller executes a manual gear shifting mode, including: performing a gear balancing operation to make the gears of the middle axle and the rear axle consistent; and controlling the middle axle and the rear axle to perform a gear shifting operation.
[0070] Since the manual transmission has a gear lock function, in order to prevent the vehicle from running for a long time with the middle and rear axle gears in different states, which may cause the rear axle motor to overspeed or be forced to shift up, the present invention first performs a gear balance to ensure that the middle and rear axle gears remain the same as the gears displayed on the current instrument. This operation can avoid vehicle failures such as motor damage caused by using the middle gear during manual transmission driving.
[0071] Specifically, the gear balancing operation includes: reading the target gear displayed on the instrument; comparing the difference between the current gear of the middle axle and the target gear, and the difference between the current gear of the rear axle and the target gear; and sending a correction instruction separately to the corresponding transmission controller that is inconsistent with the target gear.
[0072] Then, according to driving needs, the middle and rear axles will simultaneously upshift or downshift. Figure 4 As shown, controlling the middle bridge and the rear bridge to perform a shift operation includes:
[0073] The shift command is sent to the mid-axle gearbox controller and the rear-axle gearbox controller, and the shift command includes an upshift command or a downshift command; after receiving the command, the mid-axle gearbox controller and the rear-axle gearbox controller control the mid-axle motor and the rear-axle motor to clear torque and adjust speed, and control the mid-axle gearbox and the mid-axle gearbox to shift gears; after the mid-axle and rear-axle gear shift is completed, the mid-axle motor and the rear-axle motor return torque, and feed back the mid-axle and rear-axle gear positions to the vehicle controller.
[0074] Embodiment 2:
[0075] The embodiment of the present invention also provides a dual electric drive axle driven vehicle shift control system, the system includes: a vehicle controller, and a shift lever, a middle axle and a rear axle connected to the vehicle controller.
[0076] The shift lever is used to send a gear signal to the vehicle controller; the middle bridge and the rear bridge are used to perform corresponding shift operations according to the shift instructions issued by the vehicle controller; the vehicle controller is used to execute the dual electric drive axle drive vehicle shift control method in the above embodiment 1.
[0077] Among them, the mid-bridge includes: a mid-bridge gearbox controller, a mid-bridge motor controller, a mid-bridge motor and a mid-bridge gearbox; the mid-bridge gearbox controller is respectively connected to the vehicle controller, the mid-bridge motor controller and the mid-bridge gearbox; the mid-bridge motor controller is connected to the mid-bridge motor; the mid-bridge gearbox controller controls the mid-bridge motor to clear torque and adjust speed, specifically: the mid-bridge gearbox controller sends instructions to the mid-bridge motor controller, and the mid-bridge motor controller controls the mid-bridge motor to clear torque and adjust speed according to the received instructions.
[0078] The rear axle includes: a rear axle gearbox controller, a rear axle motor controller, a rear axle motor and a rear axle gearbox; the rear axle gearbox controller is respectively connected to the vehicle controller, the rear axle motor controller and the rear axle gearbox; the rear axle motor controller is connected to the rear axle motor; the rear axle gearbox controller controls the rear axle motor to clear torque and adjust speed, specifically: the rear axle gearbox controller sends instructions to the rear axle motor controller, and the rear axle motor controller controls the rear axle motor to clear torque and adjust speed according to the received instructions.
[0079] In addition, the vehicle controller is connected to the vehicle's instrument, which is used to display the current gear position and receive the driver's gear shifting command. In addition, the instrument maintains the gear position displayed before the gear shift until the gear positions of the middle bridge and the rear bridge are consistent.
[0080] Embodiment 3:
[0081] The embodiment of the present invention further provides a new energy heavy truck, the new energy heavy truck comprising: the shift control system in the above embodiment 2, or the shift control method in the above embodiment 1
[0082] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.
Claims
1. A dual electric drive axle driven vehicle shift control method, characterized in that: include: Obtaining the gear position signal of the gear lever and determining the signal type; If the gear position signal is an automatic gear signal, the automatic gear shifting mode is executed, including: when upshifting, the middle axle of the vehicle is preferentially controlled to perform the gear shifting operation and the gear shifting function of the rear axle of the vehicle is locked; when downshifting, the rear axle of the vehicle is preferentially controlled to perform the gear shifting operation and the gear shifting function of the middle axle of the vehicle is locked; If the gear signal is a manual gear signal, a manual gear shifting mode is executed, including: performing a gear balancing operation to make the gears of the middle axle and the rear axle consistent; and controlling the middle axle and the rear axle to perform a gear shifting operation.
2. The dual electric drive axle drive vehicle shift control method according to claim 1, characterized in that: When shifting up, the vehicle's middle axle is given priority to perform the shift operation and the shift function of the vehicle's rear axle is locked, including: Sending upshift command to mid-bridge gearbox controller; After receiving the command, the mid-bridge gearbox controller controls the mid-bridge motor to clear torque and adjust speed, and controls the mid-bridge gearbox to shift up; After the mid-bridge upshift is completed, the mid-bridge motor will continue to twist and feed back the mid-bridge gear position to the vehicle controller; Sending upshift command to rear axle transmission controller; After receiving the command, the rear axle gearbox controller controls the rear axle motor to clear torque and adjust speed, and controls the rear axle gearbox to shift up; After the rear axle is shifted up, the rear axle motor is still twisted and the rear axle gear position is fed back to the vehicle controller.
3. The dual electric drive axle drive vehicle shift control method according to claim 1, characterized in that: When downshifting, the rear axle of the vehicle is given priority to perform the shift operation and the shift function of the middle axle of the vehicle is locked, including: Sending a downshift command to the rear axle transmission controller; After receiving the command, the rear axle gearbox controller controls the rear axle motor to clear torque and adjust speed, and controls the rear axle gearbox to downshift; After the rear axle downshifts, the rear axle motor still twists and feeds back the rear axle gear position to the vehicle controller; Sending downshift command to mid-bridge gearbox controller; After receiving the command, the mid-bridge gearbox controller controls the mid-bridge motor to clear torque and adjust speed, and controls the mid-bridge gearbox to downshift; After the mid-bridge downshift is completed, the mid-bridge motor continues to twist and feeds back the mid-bridge gear position to the vehicle controller.
4. The dual electric drive axle drive vehicle shift control method according to claim 1, characterized in that: Controlling the middle axle and the rear axle to perform a gear shift operation includes: Sending a shift instruction to the mid-axle gearbox controller and the rear-axle gearbox controller, the shift instruction including an upshift instruction or a downshift instruction; After receiving the instruction, the middle axle gearbox controller and the rear axle gearbox controller control the middle axle motor and the rear axle motor to clear torque and adjust speed, and control the middle axle gearbox and the middle axle gearbox to shift gears; After the middle axle and rear axle shift is completed, the middle axle motor and rear axle motor are still twisted, and the middle axle and rear axle gear positions are fed back to the vehicle controller.
5. The dual electric drive axle drive vehicle shift control method according to claim 1, characterized in that: The automatic shifting mode also includes: the vehicle instrument maintains displaying the gear position before the shifting until the gear positions of the middle axle and the rear axle are consistent.
6. The dual electric drive axle drive vehicle shift control method according to claim 5, characterized in that: The gear balancing operation includes: Read the target gear position displayed on the vehicle instrument panel; Comparing the difference between the current gear position of the middle axle and the target gear position, and the difference between the current gear position of the rear axle and the target gear position respectively; A correction instruction is sent separately to the corresponding transmission controller that is inconsistent with the target gear.
7. A dual electric drive axle drive vehicle shift control system, characterized in that: include: A vehicle controller, and a shift lever, a middle bridge and a rear bridge connected to the vehicle controller; The shift lever is used to send a gear position signal to the vehicle controller; The middle bridge and the rear bridge are used to perform corresponding shifting operations according to the shifting instructions issued by the vehicle controller; The vehicle controller is used to execute the gear shift control method for a dual electric drive axle driven vehicle according to any one of claims 1 to 6.
8. The dual electric drive axle drive vehicle shift control system according to claim 7, characterized in that: The middle bridge includes: a middle bridge gearbox controller, a middle bridge motor and a middle bridge gearbox; the rear bridge includes: a rear bridge gearbox controller, a rear bridge motor and a rear bridge gearbox; The mid-bridge gearbox controller is respectively connected to the vehicle controller, the mid-bridge motor and the mid-bridge gearbox; The rear axle gearbox controller is connected to the vehicle controller, the rear axle motor and the rear axle gearbox respectively.
9. The dual electric drive axle drive vehicle shift control system according to claim 7, characterized in that: The vehicle controller is connected to the instrument of the vehicle; the instrument maintains displaying the gear position before the gear shift until the gear positions of the middle axle and the rear axle are consistent.
10. A new energy heavy truck, characterized in that: include: The dual electric drive axle drive vehicle shift control system as described in claims 7 to 9, or the dual electric drive axle drive vehicle shift control method as described in any one of claims 1 to 6.