Gear shift control method, system and vehicle

Abstract

The present invention relates to the field of vehicle control technology, and provides a shift control method, system, and vehicle, applicable to vehicles with dual electric drive axle drive systems. The method comprises: obtaining vehicle parameters, including vehicle control parameters, driving parameters, and environmental parameters; determining a target gear position for the dual axles of the vehicle based on the vehicle parameters; and controlling the dual axles of the vehicle to execute a gear shift based on the target gear position when the target gear position is inconsistent with the current gear position of the dual axles of the vehicle. The present invention is intended to address the drawback of the prior art of insufficient vehicle driving performance caused by the lack of a better method for controlling the target gear position of the transmission of a dual electric drive axle system, thereby achieving shift control under all operating conditions of the vehicle and improving the driving performance of the vehicle.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a gear shift control method, system and vehicle. Background Art

[0002] Currently, the electrification of commercial vehicles has become a trend, and the lightweight new energy electric axle drive system has a high degree of integration, which greatly frees up chassis space and further improves overall efficiency.

[0003] For the dual electric drive axle drive system, it can realize real-time four-wheel drive, so that the vehicle has better power and escape performance while ensuring economy. The dual-bridge drive can effectively solve the problem of power interruption during gear shifting, thereby improving the driving comfort of the entire vehicle.

[0004] For dual electric drive axles, gear control in the transmission is crucial. Improper gear control can negatively impact economy, power, drivability, and the durability of related hardware. However, there is currently no effective solution for gear control in dual electric drive axle systems. Summary of the Invention

[0005] The present invention provides a shift control method, system and vehicle, which are used to solve the problem of poor vehicle driving performance caused by the lack of a better way to control the target gear position of the transmission of a dual electric drive axle system in the prior art, realize shift control under all working conditions of the vehicle, and improve the driving performance of the vehicle.

[0006] The present invention provides a shift control method applied to a vehicle with a dual electric drive axle drive system, comprising:

[0007] Acquiring vehicle parameters, including vehicle control parameters, driving parameters, and environmental parameters;

[0008] determining a dual-bridge target gear position of the vehicle based on the vehicle parameters;

[0009] When the dual-bridge target gear position is inconsistent with the dual-bridge current gear position of the vehicle, the dual-bridge of the vehicle is controlled to perform gear shifting based on the dual-bridge target gear position.

[0010] The shift control method according to the present invention further includes:

[0011] Obtaining the real-time speed of the vehicle;

[0012] determining a real-time rotation speed of the dual bridge based on the real-time vehicle speed;

[0013] determining whether the real-time rotational speed is greater than a first rotational speed threshold;

[0014] When it is determined that the real-time speed is greater than the first speed threshold, the dual-bridge target gear is determined based on a preset forced upshift rule.

[0015] According to the shift control method of the present invention, after determining the dual-axle target gear position of the vehicle based on the vehicle parameters, the method further includes:

[0016] When there is a preset bridge in the dual bridge, the target speed of the preset bridge is determined based on the target gear of the preset bridge, and the preset bridge is the bridge in the dual bridge whose target gear is lower than the current gear;

[0017] determining whether the target speed is greater than a second speed threshold;

[0018] When it is determined that the target speed is greater than the second speed threshold, the preset bridge is prohibited from performing gear shifting.

[0019] According to the shift control method of the present invention, determining the dual-bridge target gear position of the vehicle based on the vehicle parameters includes:

[0020] determining, based on the control parameter, whether a gear control function of the vehicle is in an activated state, the gear control function including: forced neutral and prohibited gear shifting;

[0021] If so, determining the dual-bridge target gear position based on a preset target gear position determination rule corresponding to the gear position control function;

[0022] If not, determine the gear lever position of the vehicle, and when the gear lever position is in reverse gear, neutral gear, park gear or manual gear, determine the target gear position for prohibiting the dual-axle from shifting based on the preset correspondence between the gear position and the gear lever position; and when the gear lever position is in other gear positions, determine the target gear position of the dual-axle based on the driving parameters and the environmental parameters.

[0023] According to the shift control method of the present invention, determining the dual-bridge target gear position based on the driving parameters and the environmental parameters includes:

[0024] determining a driving condition of the vehicle based on the driving parameters;

[0025] When the driving operating condition belongs to a preset special operating condition, the dual-bridge target gear position is determined based on a preset target gear position determination rule corresponding to the preset special operating condition.

[0026] According to the shift control method of the present invention, the determining of the dual-bridge target gear position based on the driving parameter and the environmental parameter further includes:

[0027] When the driving condition does not belong to the preset special condition, determining the road condition on which the vehicle is traveling based on the environmental parameters;

[0028] The dual-bridge target gear is determined based on a preset correspondence between vehicle speed and gear, the road condition, and the current speed of the vehicle.

[0029] According to the shift control method of the present invention, controlling the dual-bridge of the vehicle to perform shifting based on the dual-bridge target gear position includes:

[0030] Determining whether both the two bridges need to be shifted based on the current gear positions of the two bridges and the target gear positions of the two bridges;

[0031] If necessary, determining the shift priority of the dual-bridge based on the preset shift priority, the current gear position of the dual-bridge and the target gear position of the dual-bridge;

[0032] Controlling the dual bridge to shift gears in sequence according to the determined shift priority;

[0033] If not, based on the dual-bridge target gear position, the bridge that needs to be shifted is controlled to shift gears.

[0034] According to the shift control method of the present invention, before controlling the dual-bridge of the vehicle to perform shifting based on the dual-bridge target gear position, the method further includes:

[0035] monitoring the shifting state of the dual bridge;

[0036] Based on the shifting state, determining whether there is a shifting bridge in the dual bridges, the shifting bridge being a bridge in the shifting process;

[0037] After determining that the shift bridge exists in the dual bridge, the gear position of the dual bridge after the shifting process is completed is used as the current gear position of the dual bridge.

[0038] The present invention also provides a shift control system, which is applied to a vehicle having a dual electric drive axle drive system, comprising:

[0039] A parameter acquisition module is used to acquire vehicle parameters, including vehicle control parameters, driving parameters, and environmental parameters;

[0040] a gear determination module, configured to determine a dual-axle target gear position of the vehicle based on the vehicle parameters;

[0041] The gear shift execution module is used to control the dual-bridge of the vehicle to execute gear shift based on the dual-bridge target gear position when the dual-bridge target gear position is inconsistent with the dual-bridge current gear position of the vehicle.

[0042] The present invention also provides a vehicle including a dual electric drive axle drive system and the shift control system described above.

[0043] The present invention provides a shift control method, system and vehicle, which obtain the vehicle's control parameters, driving parameters, and environmental parameters, and then determine the vehicle's dual-bridge target gear based on these vehicle parameters, so that the dual-bridge target gear can be highly adapted to the vehicle's current operating conditions, thereby satisfying the vehicle's shift control under all operating conditions. At the same time, when the vehicle's dual bridges are controlled to execute shifting based on the determined dual-bridge target gear, the vehicle's driving performance can be effectively improved, and driving safety can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 is a flow chart of a shift control method provided by an embodiment of the present invention;

[0046] Figure 2 1 is a schematic diagram of a flow chart of a TCU determining a dual-bridge target gear position according to an embodiment of the present invention;

[0047] Figure 3 1 is a schematic diagram of a flow chart of a TCU controlling dual-bridge shifting according to an embodiment of the present invention;

[0048] Figure 4 1 is a schematic structural diagram of a gear shift control system provided by an embodiment of the present invention;

[0049] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0051] The following combination Figures 1 to 3The present invention describes a shift control method that is executed in the automatic transmission control unit (TCU) of a vehicle transmission. The control method is applied to a vehicle with a dual electric drive axle drive system, such as Figure 1 As shown, the following steps are included:

[0052] 101. Acquire vehicle parameters, including vehicle control parameters, driving parameters, and environmental parameters;

[0053] Control parameters can reflect the status of various vehicle control functions, such as the vehicle's gear position (R, D, or P); control mode (manual, automatic, snow, or mud); and forced neutral, which can specifically include the vehicle's gear lever position and forced neutral command. Driving parameters can reflect the vehicle's operating status, such as vehicle speed, wheel speed, and driving direction. Environmental parameters can reflect the vehicle's driving conditions and environment, such as snowy roads, icy surfaces, low temperatures, or high temperatures.

[0054] Furthermore, vehicle parameters can be obtained through vehicle controllers, various sensors, and human-computer interaction between the driver and the vehicle.

[0055] It should be noted that by obtaining vehicle parameters, it is possible to determine whether the vehicle's gear-related control functions are in an activated state, the vehicle's specific driving conditions, and the vehicle's driving road conditions, thereby covering all vehicle conditions.

[0056] 102. Determine a dual-axle target gear position of the vehicle based on the vehicle parameters;

[0057] It should be noted that, based on the vehicle parameters, the current accurate working condition of the vehicle can be determined. Therefore, based on the vehicle parameters, the dual-axle target gear of the vehicle determined can be highly adapted to the current working condition of the vehicle.

[0058] In one embodiment, based on vehicle parameters, it is determined that the forced neutral function of the vehicle is activated, and the dual-axle target gear position of the vehicle can be determined to be neutral.

[0059] 103. When the dual-bridge target gear position is inconsistent with the dual-bridge current gear position of the vehicle, control the dual-bridge of the vehicle to perform gear shifting based on the dual-bridge target gear position.

[0060] It should be noted that only when the dual-bridge target gear position is inconsistent with the dual-bridge current gear position, it is necessary to control the dual-bridge to perform gear shifting. When the dual-bridge target gear position is consistent with the dual-bridge current gear position, the dual-bridge does not need to shift gears.

[0061] The shift control method provided by the embodiment of the present invention is that the TCU of the vehicle determines the target gear position of the dual-bridge by obtaining vehicle control parameters, driving parameters, and environmental parameters, so that the target gear position of the dual-bridge can be highly adapted to the current working condition of the vehicle, thereby satisfying reasonable shift control under all working conditions of the vehicle. At the same time, when the dual-bridge of the vehicle is controlled to execute shifting based on the determined target gear position of the dual-bridge, the driving performance of the vehicle can be effectively improved, and driving safety can be improved.

[0062] Based on the content of the above embodiment, the shift control method further includes:

[0063] Obtaining the real-time speed of the vehicle;

[0064] determining a real-time rotation speed of the dual bridge based on the real-time vehicle speed;

[0065] determining whether the real-time rotational speed is greater than a first rotational speed threshold;

[0066] When it is determined that the real-time speed is greater than the first speed threshold, the dual-bridge target gear is determined based on a preset forced upshift rule.

[0067] It's understandable that for the same vehicle speed, the higher the gear in the transmission, the lower the corresponding speed. Both the transmission and the motor have maximum speed requirements. Exceeding these maximum speeds can damage the transmission or motor hardware. Simultaneously, the speed of both axles can be determined based on the vehicle's speed, and the transmission and motor speeds can then be further calculated.

[0068] Specifically, assuming that the maximum tolerable speed of the vehicle's gearbox is 9000 r / min and the maximum tolerable speed of the vehicle's motor is 10000 r / min, by setting the first speed threshold to the corresponding gearbox speed of 8000 r / min, and then determining the real-time speed of the dual-bridge by obtaining the real-time speed of the vehicle, and then comparing the real-time speed of the dual-bridge with the first speed threshold, and when this real-time speed is greater than the first speed threshold, determining the target gear position of the dual-bridge based on the preset forced upshift rule, can effectively prevent the speed of the vehicle's gearbox and vehicle motor from reaching the maximum tolerable speed, that is, avoid causing hardware damage.

[0069] More specifically, the preset forced upshift rule may be set to shift up one gear, two gears, etc. relative to the current gear of the dual-axle, and no specific limitation is made here.

[0070] The shift control method provided in the embodiment of the present application, on the one hand, determines a target gear that is highly adapted to the current operating conditions of the vehicle based on vehicle parameters, thereby significantly improving the vehicle's driving performance; on the other hand, by defining a forced upshift function, it achieves pre-control of the speed to prevent the speed from exceeding the limit and causing damage to the gearbox hardware and the motor.

[0071] Based on the content of the above embodiment, after determining the dual-bridge target gear position of the vehicle based on the vehicle parameters, the method further includes:

[0072] When the dual-bridge target gear position is lower than the dual-bridge current gear position, determining a target speed of the vehicle motor based on the dual-bridge target gear position;

[0073] When there is a preset bridge in the dual bridge, the target speed of the preset bridge is determined based on the target gear of the preset bridge, and the preset bridge is the bridge in the dual bridge whose target gear is lower than the current gear;

[0074] determining whether the target speed is greater than a second speed threshold;

[0075] When it is determined that the target speed is greater than the second speed threshold, the preset bridge is prohibited from performing gear shifting.

[0076] It should be noted that, based on the dual-bridge target gear, the corresponding dual-bridge target speed can be estimated.

[0077] It can be understood that, taking the maximum tolerable speed of the vehicle transmission as 9000r / min and the maximum tolerable speed of the vehicle motor as 10000r / min as an example, assuming that the current gear of the dual-bridge is 2nd gear, and the vehicle transmission speed has reached 8000r / min, if the target gear of any of the dual-bridges is determined to be 1st gear at this time, if the gear shift is performed according to the target gear of the bridge, there is a risk that the vehicle transmission speed will exceed 9000r / min. Therefore, by setting a second speed threshold, and after determining the target gear of the dual-bridge, the target speed of the bridge that needs to be downshifted in the dual-bridge is compared with the second speed threshold, and when the target speed is greater than the second speed threshold, the bridge is prohibited from performing gear shifts, which can also prevent the speed from exceeding the limit, thereby protecting the transmission hardware and the motor.

[0078] The shift control method provided in the embodiment of the present application, on the one hand, determines a target gear that is highly adapted to the current operating conditions of the vehicle based on vehicle parameters, thereby significantly improving the vehicle's driving performance; on the other hand, by defining a downshift prohibition function, the speed is pre-controlled to prevent the speed from exceeding the limit and causing damage to the gearbox hardware and the motor.

[0079] Based on the content of the above embodiment, determining the dual-bridge target gear position of the vehicle based on the vehicle parameters includes:

[0080] determining, based on the control parameter, whether a gear control function of the vehicle is in an activated state, the gear control function including: forced neutral and prohibited gear shifting;

[0081] If so, determining the dual-bridge target gear position based on a preset target gear position determination rule corresponding to the gear position control function;

[0082] If not, determine the gear lever position of the vehicle, and when the gear lever position is in reverse gear, neutral gear, park gear or manual gear, determine the dual-axle target gear position based on a preset correspondence between the gear position and the gear lever position; and when the gear lever position is in other gear positions, determine the dual-axle target gear position based on the driving parameters and the environmental parameters.

[0083] It should be noted that the vehicle has a protection function. For example, when it is determined that the vehicle battery or motor has failed, the battery management system or vehicle controller will send a forced neutral command to the TCU to stop the vehicle. At the same time, the vehicle controller will generally send a prohibition shift command to the TCU when the vehicle is slipping, getting out of trouble, going uphill, etc., to avoid gear switching in these driving conditions, which may easily cause vehicle driving risks.

[0084] Furthermore, based on the gear lever position, the initial value of each gear can be defined, that is, the preset correspondence between the gear position and the gear lever position. When the gear lever position is in reverse, neutral or park, the initial value of the corresponding gear can be used as the double-bridge target gear; and when the gear lever position is in the manual M gear, since the gear is controlled by the driver's operation, the gear change of the transmission can be controlled based on the M gear up / down command input according to the preset correspondence between the gear position and the gear lever position.

[0085] In one embodiment, when the gear lever is in M ​​gear, the target gear of the dual bridges can be defined according to the principle that one bridge has priority to upshift and the other bridge has priority to downshift, or one bridge has priority to downshift and the other bridge has priority to upshift, so as to ensure that the dual bridges will not switch gears at the same time, prevent power interruption and TCU drive overload problems.

[0086] It can be understood that "bridge one" and "bridge two" refer to the two bridges of the vehicle's double bridges respectively, and there is no order restriction between "bridge one" and "bridge two", which are only used to distinguish the two bridges. Therefore, bridge A and bridge B, the first bridge and the second bridge, etc. can also be used to represent the double bridges respectively, and no specific restrictions are made here.

[0087] The shift control method provided by the embodiment of the present invention, based on the control parameters of the vehicle, realizes the definition of the double-bridge target gear according to different preset target gear determination rules when the vehicle's forced neutral function or the prohibited shift function is activated, the vehicle's gear lever position is in reverse gear, neutral gear, parking gear or manual gear, and the gear lever position is in other gear positions, so that the gear control is clearer and more accurate.

[0088] Based on the content of the above embodiment, determining the dual-bridge target gear position based on the driving parameters and the environmental parameters includes:

[0089] determining a driving condition of the vehicle based on the driving parameters;

[0090] When the driving operating condition belongs to a preset special operating condition, the dual-bridge target gear position is determined based on a preset target gear position determination rule corresponding to the preset special operating condition.

[0091] Among them, the preset special operating conditions refer to extreme driving conditions where there are driving hazards, or dangerous driving conditions, such as: skidding, getting out of trouble, going uphill or downhill on a steep road surface, driving on a curve, etc.

[0092] In one embodiment, by acquiring the wheel speed in the driving parameters, it can be determined whether a speed difference is formed, thereby determining whether the vehicle is slipping.

[0093] It should be noted that special operating conditions that cannot be detected by the vehicle controller can be defined as preset special operating conditions corresponding to the TCU. The TCU defines the target gear position for both axles according to the preset target gear determination rules for these special operating conditions. This allows for targeted gear control based on extreme driving conditions, thereby improving driving safety.

[0094] In one embodiment, the target gear determination rule for a predefined special operating condition can include a gear shift restriction. Specifically, when the vehicle's driving condition is determined to be a predefined special operating condition based on driving parameters, the gears of both axles are maintained unchanged to prevent sudden power changes caused by gear shifts, thereby ensuring driving safety under extreme driving conditions. Furthermore, by defining a gear shift restriction feature, frequent gear shifting of both axles can be prevented, thereby ensuring the durability of the gear shift actuator and overall vehicle performance.

[0095] The shift control method provided by the embodiment of the present invention is based on the vehicle's driving parameters, and realizes the definition of the dual-bridge target gear according to specific preset target gear determination rules when the vehicle is in a preset special working condition, thereby effectively improving driving safety.

[0096] Based on the content of the above embodiment, the determining the dual-bridge target gear position based on the driving parameters and the environmental parameters further includes:

[0097] When the driving condition does not belong to the preset special condition, determining the road condition on which the vehicle is traveling based on the environmental parameters;

[0098] The dual-bridge target gear is determined based on a preset correspondence between vehicle speed and gear, the road condition, and the current speed of the vehicle.

[0099] It should be noted that environmental parameters can reflect the vehicle's driving environment. When the vehicle is driving on ice, snowy roads, etc., the driving difficulty and risk will increase.

[0100] In one embodiment, the TCU can be based on the driver's demand input related to human-computer interaction, for example: the driver selects mud mode, snow mode, etc., and the temperature obtained by the vehicle air conditioner and the slope detection value obtained by the vehicle's slope sensor are used as environmental parameters to determine the road conditions on which the vehicle is traveling. Then, based on the road conditions, the vehicle's current speed and the preset correspondence between the speed and the gear, the dual-axle target gear is determined, so that the determined dual-axle target gear is more suitable for the current working conditions, thereby improving driving safety.

[0101] The shift control method provided by the embodiment of the present invention takes into account the influence of environmental factors on driving safety during the process of determining the target gear position of the dual-bridge, thereby further improving the safety of vehicle driving.

[0102] Combine Figure 2 This section describes the control logic used by the TCU to determine the target gear position for the dual-axle transmission. Figure 2 It is a flow chart of the TCU determining the dual-bridge target gear provided by an embodiment of the present invention. It is understandable that the TCU has multiple control states, such as initialization, operation, sleep, post-processing, etc. Among them, the control states such as initialization, sleep, and post-processing generally do not involve speed adjustment. Therefore, only the TCU is in the operation state as the designated control state. Then, when the TCU is in the non-designated control state, the dual-bridge target gear is determined according to the corresponding preset determination rules. When the TCU is in the designated control state, the gear shift control method provided by the above embodiment of the present invention is used to determine the dual-bridge target gear. Based on this, Figure 2 As shown, the specific process of TCU determining the dual-bridge target gear position is as follows:

[0103] 201. Determine whether the TCU control state is the specified operating state; if not, execute step 202; if so, execute step 203;

[0104] 202. Determine the dual-bridge target gear position according to a preset determination rule, and proceed to step 218;

[0105] 203. Obtain vehicle parameters and proceed to steps 204 and 216 respectively;

[0106] 204. Determine whether the forced neutral function is activated; if so, execute step 205; if not, execute step 206;

[0107] 205. Determine the dual-axle target gear position based on a preset target gear position determination rule corresponding to the forced neutral function, and proceed to step 218;

[0108] 206. Determine the position of the gear lever. If the gear lever is in reverse gear, neutral gear, park gear, or manual gear, execute step 207. If the gear lever is in other gear positions, execute step 208.

[0109] 207. Determine the target gear position as the gear position corresponding to the corresponding gear lever position, and proceed to step 218;

[0110] 208. Determine a driving condition of the vehicle based on the driving parameters;

[0111] 209. Determine whether the driving condition belongs to a preset special condition; if so, execute step 210; if not, execute step 211;

[0112] 210. Determine the dual-axle target gear position based on a preset target gear position determination rule corresponding to a preset special operating condition, and execute step 213;

[0113] 211. Determine the road condition of the vehicle based on environmental parameters;

[0114] 212. Based on the preset correspondence between vehicle speed and gear position, road conditions, and the current vehicle speed, determine the dual-bridge target gear position, and execute step 213;

[0115] 213. Determine a target speed of a preset bridge based on a target gear position of the preset bridge in the dual bridge;

[0116] 214. Based on the comparison between the target speed of the preset axle and the second speed threshold, determine whether the target gear of the preset axle is reasonable; if so, proceed to step 218; if not, proceed to step 215;

[0117] 215. The current gear position of the preset bridge is used as the target gear position of the preset bridge, and the process proceeds to step 218;

[0118] 216. Determine in real time whether the real-time speed of the dual bridge is greater than the first speed threshold; if so, proceed to step 217; if not, proceed to step 218;

[0119] 217. Based on the preset forced upshift rule, determine the dual-axle target gear position, and proceed to step 218;

[0120] 218. Complete the target gear determination process.

[0121] Based on the content of the above embodiment, controlling the dual-bridge of the vehicle to perform gear shifting based on the dual-bridge target gear position includes:

[0122] Determining whether both the two bridges need to be shifted based on the current gear positions of the two bridges and the target gear positions of the two bridges;

[0123] If necessary, determining the shift priority of the dual-bridge based on the preset shift priority, the current gear position of the dual-bridge and the target gear position of the dual-bridge;

[0124] Controlling the dual bridge to shift gears in sequence according to the determined shift priority;

[0125] If not, based on the dual-bridge target gear position, the bridge that needs to be shifted is controlled to shift gears.

[0126] It should be noted that when it is confirmed that both bridges need to execute gear shifting, the gear shifting priority of the two bridges is determined based on the current gear position, target gear position and preset gear shifting priority, and then the two bridges are controlled to shift gears in sequence according to the priority, so that the two bridges will not execute gear shifting at the same time, preventing power interruption and avoiding the problem of TCU drive overload.

[0127] Furthermore, the definition of preset shift priorities can include the required shift principles based on considerations of TCU driving capabilities, vehicle requirements, hardware systems and other relevant factors, so that priority-based shifting can further improve the driving performance of the vehicle.

[0128] In one embodiment, the initial value of the dual-bridge shift pointer can be defined based on the dual-bridge target gear and the current gear, the preset shift priority can be set in the form of a list, and then a table is looked up according to the initial value of the dual-bridge shift pointer to define the dual-bridge shift pointer and its priority value. Finally, the bridge with a larger priority value is controlled to execute the shift first, and its shift pointer value is output normally. Otherwise, the shift pointer is locked and the previous value is maintained for output.

[0129] The shift control method provided in the embodiment of the present invention includes the required shift principles by defining preset shift priorities, making the control logic simpler and easier to apply, and suitable for platform-based promotion and application. The shift principles may include but are not limited to a shift interlock function to ensure that the dual bridges do not switch gears at the same time, prevent power interruption, and prevent TCU drive overload problems.

[0130] Based on the content of the above embodiment, before controlling the dual bridges of the vehicle to perform gear shifting based on the dual bridge target gear position, the method further includes:

[0131] monitoring the shifting state of the dual bridge;

[0132] Based on the shifting state, determining whether there is a shifting bridge in the dual bridges, the shifting bridge being a bridge in the shifting process;

[0133] After determining that the shift bridge exists in the dual bridge, the gear position of the dual bridge after the shifting process is completed is used as the current gear position of the dual bridge.

[0134] It should be noted that before controlling the dual-bridge gear shifting based on the dual-bridge target gear position, the gear shifting status of the dual-bridge is monitored first, and then when any of the dual-bridge gears is in the gear shifting process, the gear shifting process is kept uninterrupted to avoid abnormalities that may be caused by interrupted gear shifting.

[0135] Combine Figure 3 Explain the control logic of TCU shift control. Figure 3 FIG. 1 is a flow chart of a TCU controlling a dual-bridge shift according to an embodiment of the present invention. Figure 3 As shown in the figure, the specific process of TCU controlling dual-bridge shifting is as follows:

[0136] 301. Monitor shift status;

[0137] 302. Determine whether any bridge is in the process of shifting; if so, execute step 303; if not, execute step 304;

[0138] 303. After the shift control process is completed, execute step 304;

[0139] 304. Based on the current gear positions of both bridges and the target gear positions of both bridges, determine whether both bridges need to shift gears; if not, proceed to step 305; if so, proceed to step 306;

[0140] 305. Control the shifting of the bridge that needs to perform the shifting;

[0141] 306. Determine the shift priority of the dual axles;

[0142] 307. Based on the shifting priority, control the dual bridges to shift gears in sequence.

[0143] The shift control method provided by the embodiments of the present invention includes target gear determination for a single TCU and dual transmission under all vehicle operating conditions, making it applicable to systems with similar single- and dual-speed transmission configurations. Furthermore, a shift inhibition function is added based on vehicle driving parameters for gears other than manual, reverse, park, and neutral, ensuring safety under extreme operating conditions. This function effectively prevents frequent shifting, thereby ensuring the durability of the shift actuator and vehicle drivability. Furthermore, after determining the target gear for the dual-axle system, downshift inhibition and forced upshift functions are added to provide protection before reaching the maximum speed limit for the hardware or motor. This prevents damage to the transmission hardware and motor by pre-controlling the speed. Finally, based on the preset shift priority settings, all possible required shift principles are included, making the control logic simpler and easier to understand. Functions such as gear interlocking can be implemented, ensuring applicability even to systems with weak TCU drive capabilities.

[0144] A shift control system provided by the present invention is described below. The shift control system described below and the shift control method described above can refer to each other.

[0145] An embodiment of the present invention provides a shift control system, such as Figure 4 As shown, it is applied to TCU, including: parameter acquisition module 410, gear determination module 420 and gear shift execution module 430; wherein,

[0146] The parameter acquisition module 410 is used to acquire vehicle parameters, including vehicle control parameters, driving parameters, and environmental parameters;

[0147] The gear determination module 420 is used to determine the dual-axle target gear of the vehicle based on the vehicle parameters;

[0148] The gear shift execution module 430 is configured to control the dual-axle gears of the vehicle to execute gear shifts based on the dual-axle target gear when the dual-axle target gear is inconsistent with the dual-axle current gear of the vehicle.

[0149] The shift control system provided by the embodiment of the present invention obtains the vehicle's control parameters, driving parameters, and environmental parameters, and then determines the vehicle's dual-bridge target gear position based on these vehicle parameters, so that the dual-bridge target gear position can be highly adapted to the vehicle's current operating conditions, thereby meeting the vehicle's shift control under all operating conditions. At the same time, when the vehicle's dual-bridges are controlled to execute shifting based on the determined dual-bridge target gear position, the vehicle's driving performance can be effectively improved, and driving safety can be improved.

[0150] Optionally, the gear determination module 420 is configured to:

[0151] Obtaining the real-time speed of the vehicle;

[0152] determining a real-time rotation speed of the dual bridge based on the real-time vehicle speed;

[0153] determining whether the real-time rotational speed is greater than a first rotational speed threshold;

[0154] When it is determined that the real-time speed is greater than the first speed threshold, the dual-bridge target gear is determined based on a preset forced upshift rule.

[0155] Optionally, the gear shift execution module 430 is further configured to:

[0156] When there is a preset bridge in the dual bridge, the target speed of the preset bridge is determined based on the target gear of the preset bridge, and the preset bridge is the bridge in the dual bridge whose target gear is lower than the current gear;

[0157] determining whether the target speed is greater than a second speed threshold;

[0158] When it is determined that the target speed is greater than the second speed threshold, the preset bridge is prohibited from performing gear shifting.

[0159] Optionally, determining the dual-bridge target gear position of the vehicle based on the vehicle parameters includes:

[0160] determining, based on the control parameter, whether a gear control function of the vehicle is in an activated state, the gear control function including: forced neutral and prohibited gear shifting;

[0161] If so, determining the dual-bridge target gear position based on a preset target gear position determination rule corresponding to the gear position control function;

[0162] If not, determine the gear lever position of the vehicle, and when the gear lever position is in reverse gear, neutral gear, park gear or manual gear, determine the dual-axle target gear position based on a preset correspondence between the gear position and the gear lever position; and when the gear lever position is in other gear positions, determine the dual-axle target gear position based on the driving parameters and the environmental parameters.

[0163] Optionally, determining the dual-bridge target gear position based on the driving parameter and the environmental parameter includes:

[0164] determining a driving condition of the vehicle based on the driving parameters;

[0165] When the driving operating condition belongs to a preset special operating condition, the dual-bridge target gear position is determined based on a preset target gear position determination rule corresponding to the preset special operating condition.

[0166] Optionally, the determining the dual-bridge target gear position based on the driving parameter and the environmental parameter further includes:

[0167] When the driving condition does not belong to the preset special condition, determining the road condition on which the vehicle is traveling based on the environmental parameters;

[0168] The dual-bridge target gear is determined based on a preset correspondence between vehicle speed and gear, the road condition, and the current speed of the vehicle.

[0169] Optionally, the gear shift execution module 430 is configured to:

[0170] Determining whether both the two bridges need to be shifted based on the current gear positions of the two bridges and the target gear positions of the two bridges;

[0171] If necessary, determining the shift priority of the dual-bridge based on the preset shift priority, the current gear position of the dual-bridge and the target gear position of the dual-bridge;

[0172] Controlling the dual bridge to shift gears in sequence according to the determined shift priority;

[0173] If not, based on the dual-bridge target gear position, the bridge that needs to be shifted is controlled to shift gears.

[0174] Optionally, before controlling the dual-bridge to perform gear shifting based on the target gear, the method further includes:

[0175] monitoring the shifting state of the dual bridge;

[0176] Based on the shifting state, determining whether there is a shifting bridge in the dual bridges, the shifting bridge being a bridge in the shifting process;

[0177] After determining that the shift bridge exists in the dual bridge, the gear position of the dual bridge after the shifting process is completed is used as the current gear position of the dual bridge.

[0178] The shift control system provided by the embodiment of the present invention can implement the various processes implemented by the above-mentioned shift control method embodiment and achieve the same technical effect. To avoid repetition, it will not be described here.

[0179] A vehicle provided by the present invention is described below. An embodiment of the present invention provides a vehicle including a dual electric drive axle drive system and a shift control system as described in any of the above embodiments.

[0180] It can be understood that the vehicle including the shift control system as described in any of the above embodiments has all the advantages and technical effects of the shift control system, which will not be described in detail here.

[0181] Figure 5 An example of a physical structure diagram of an electronic device is shown below. Figure 5 As shown, the electronic device may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other via the communication bus 540. The processor 510 may call the logic instructions in the memory 530 to execute a shift control method applied to a vehicle with a dual electric drive axle drive system, the method comprising: obtaining vehicle parameters, the vehicle parameters including: vehicle control parameters, driving parameters, and environmental parameters; determining a target gear position of the dual axles of the vehicle based on the vehicle parameters; and controlling the dual axles of the vehicle to perform a gear shift based on the dual axle target gear position when the dual axle target gear position is inconsistent with the current gear position of the dual axles of the vehicle.

[0182] In addition, the logic instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the various embodiments of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0183] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute a shift control method provided by the above methods, which is applied to a vehicle with a dual electric drive axle drive system. The method includes: obtaining vehicle parameters, and the vehicle parameters include: vehicle control parameters, driving parameters, and environmental parameters; based on the vehicle parameters, determining the dual-axle target gear position of the vehicle; when the dual-axle target gear position is inconsistent with the dual-axle current gear position of the vehicle, controlling the dual-axle of the vehicle to perform gear shifting based on the dual-axle target gear position.

[0184] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a gear shifting control method, which is applied to a vehicle having a dual electric drive axle drive system, the method comprising: obtaining vehicle parameters, the vehicle parameters comprising: vehicle control parameters, driving parameters, and environmental parameters; determining a dual-axle target gear position of the vehicle based on the vehicle parameters; and controlling the dual-axle of the vehicle to perform gear shifting based on the dual-axle target gear position when the dual-axle target gear position is inconsistent with the current gear position of the dual-axle of the vehicle.

[0185] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0186] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0187] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A shift control method, applied to a vehicle with a dual electric drive axle drive system, characterized in that: include: Acquiring vehicle parameters, including vehicle control parameters, driving parameters, and environmental parameters; determining a dual-bridge target gear position of the vehicle based on the vehicle parameters; When the dual-bridge target gear position is inconsistent with the dual-bridge current gear position of the vehicle, controlling the dual-bridge of the vehicle to perform gear shifting based on the dual-bridge target gear position; The determining of the dual-bridge target gear position of the vehicle based on the vehicle parameters includes: determining, based on the control parameter, whether a gear control function of the vehicle is in an activated state, the gear control function including: forced neutral and prohibited gear shifting; If so, determining the dual-bridge target gear position based on a preset target gear position determination rule corresponding to the gear position control function; If not, determine the gear lever position of the vehicle, and when the gear lever position is in reverse gear, neutral gear, park gear or manual gear, determine the double-bridge target gear position based on the preset correspondence between the gear position and the gear lever position; and when the gear lever position is in other gear positions, determine the double-bridge target gear position based on the driving parameters and the environmental parameters.

2. The shift control method according to claim 1, characterized in that: Also includes: Obtaining the real-time speed of the vehicle; determining a real-time rotation speed of the dual bridge based on the real-time vehicle speed; determining whether the real-time rotational speed is greater than a first rotational speed threshold; When it is determined that the real-time speed is greater than the first speed threshold, the dual-bridge target gear is determined based on a preset forced upshift rule.

3. The shift control method according to claim 1, wherein: After determining the dual-bridge target gear position of the vehicle based on the vehicle parameters, the method further includes: When there is a preset bridge in the dual bridge, the target speed of the preset bridge is determined based on the target gear of the preset bridge, and the preset bridge is the bridge in the dual bridge whose target gear is lower than the current gear; determining whether the target speed is greater than a second speed threshold; When it is determined that the target speed is greater than the second speed threshold, the preset bridge is prohibited from performing gear shifting.

4. The shift control method according to claim 1, wherein: The determining of the dual-bridge target gear position based on the driving parameter and the environmental parameter includes: determining a driving condition of the vehicle based on the driving parameters; When the driving operating condition belongs to a preset special operating condition, the dual-bridge target gear position is determined based on a preset target gear position determination rule corresponding to the preset special operating condition.

5. The shift control method according to claim 4, characterized in that: The determining of the dual-bridge target gear position based on the driving parameter and the environmental parameter further includes: When the driving condition does not belong to the preset special condition, determining the road condition on which the vehicle is traveling based on the environmental parameters; The dual-bridge target gear is determined based on a preset correspondence between vehicle speed and gear, the road condition, and the real-time speed of the vehicle.

6. The shift control method according to claim 1, characterized in that: The step of controlling the dual-bridge of the vehicle to perform gear shifting based on the dual-bridge target gear position includes: Determining whether both the two bridges need to be shifted based on the current gear positions of the two bridges and the target gear positions of the two bridges; If both are required, determining the shift priority of the dual bridges based on the preset shift priority, the current gear position of the dual bridges and the target gear position of the dual bridges; Controlling the dual bridge to shift gears in sequence according to the determined shift priority; If not, based on the dual-bridge target gear position, the bridge that needs to be shifted is controlled to shift gears.

7. The shift control method according to claim 6, characterized in that: Before controlling the dual bridges of the vehicle to perform gear shifting based on the dual bridge target gear position, the method further includes: monitoring the shifting state of the dual bridge; Based on the shifting state, determining whether there is a shifting bridge in the dual bridges, the shifting bridge being a bridge in the shifting process; After determining that the shift bridge exists in the dual bridge, the gear position of the dual bridge after the shifting process is completed is used as the current gear position of the dual bridge.

8. A shift control system, applied to a vehicle with a dual electric drive axle drive system, for executing the shift control method according to any one of claims 1 to 7, characterized in that: include: A parameter acquisition module is used to acquire vehicle parameters, including vehicle control parameters, driving parameters, and environmental parameters; a gear determination module, configured to determine a dual-axle target gear position of the vehicle based on the vehicle parameters; The gear shift execution module is used to control the dual-bridge of the vehicle to execute gear shift based on the dual-bridge target gear position when the dual-bridge target gear position is inconsistent with the dual-bridge current gear position of the vehicle.

9. A vehicle comprising a dual electric drive axle drive system, characterized in that: Also included is the shift control system as claimed in claim 8.

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