Economical gear shifting method, device and equipment and computer readable storage medium

Abstract

The invention discloses an economical gear shifting method, device and equipment and a computer readable storage medium, and the economical gear shifting method comprises the steps that on the basis of all driving modes of a vehicle, for a current gear i in each mode, torque combinations of adjacent gears i + 1 are traversed, power system comprehensive efficiency curves of the current gear and the adjacent gears are calculated respectively, and the power system comprehensive efficiency curves of the current gear and the adjacent gears are calculated respectively; the vehicle speed of the intersection point of two curves is used as a gear shifting point, it is ensured that after gear shifting, power sources (such as an engine and a driving motor) always operate in an efficient interval, the overall system efficiency is improved, power interruption and impact in the gear shifting process can be reduced through vehicle speed gear shifting based on the intersection point of efficiency curves of adjacent gears, and meanwhile fuel economy and driving comfort are both considered; by calculating the efficiency curve and the gear shifting point in each mode in advance, the real-time operation load is reduced, and the method is suitable for the quick response requirement of an embedded system.

Description

Technical Field

[0001] The present application relates to the field of hybrid vehicle shifting, and in particular to an economical shifting method, device, equipment and computer-readable storage medium. Background Art

[0002] A hybrid electric vehicle (HEV) is a vehicle power system that combines two or more power sources (usually an internal combustion engine and an electric motor) to achieve synergistic power output through intelligent control strategies, aiming to optimize energy efficiency, reduce emissions, and take into account power performance. Its core features include: synergy of multiple power sources, where the engine and motor work in a complementary manner to make up for their respective shortcomings (such as low-speed and low-efficiency of the engine and high-speed and high-energy consumption of the motor); energy recovery, where kinetic energy is recovered during braking and converted into electrical energy storage to improve energy utilization; and mode switching, where pure electric drive, hybrid drive, engine direct drive and other modes are automatically switched according to the working conditions.

[0003] In the relevant technology, the hybrid system is different from the traditional fuel vehicle. The gear selection under different driving modes directly affects the distribution of the working points of each power source. The traditional constant speed shifting rules do not take into account the driving mode of a specific hybrid system, resulting in each power source not fully exerting its excellent efficiency performance, causing a certain degree of fuel waste during the driving process of the whole vehicle. Summary of the invention

[0004] The present application provides an economical gear shifting method, device, equipment and computer-readable storage medium, which can solve the technical problem that the traditional constant speed gear shifting rules existing in the related art do not take into account the driving mode of a specific hybrid power system, resulting in each power source not fully exerting its excellent efficiency performance, causing a certain degree of fuel waste during the driving process of the whole vehicle.

[0005] In a first aspect, an embodiment of the present application provides an economical gear shifting method, the economical gear shifting method comprising:

[0006] Based on the vehicle's driving modes, for the current gear i in each mode, the torque combination of the adjacent gear i+1 is traversed, and the comprehensive efficiency curves of the power system of the current gear and the adjacent gear are calculated respectively. The vehicle speed at the intersection of the two curves is used as the shift point to generate the shift rules in each mode.

[0007] In combination with the first aspect, in one implementation, based on each driving mode of the vehicle, for the current gear i in each mode, traverse the torque combination of the adjacent gear i+1, calculate the power system comprehensive efficiency curves of the current gear and the adjacent gear respectively, take the vehicle speed at the intersection of the two curves as the shift point, and generate the shift rules in each mode, including:

[0008] When the vehicle is in pure electric driving mode, set the current gear to gear i, then give any drive motor torque Tm, calculate the drive motor torque Tm' corresponding to the adjacent higher gear i + 1, calculate the overall efficiency of the power system at different vehicle speeds when the drive motor torque is Tm in gear i and the overall efficiency of the power system at different vehicle speeds when the drive motor torque is Tm' in gear i + 1, and select the vehicle speed at the intersection of the two overall efficiency curves as the shift speed under the drive motor torque Tm;

[0009] For all possible drive motor torques Tm in pure electric mode in gear i, repeat the steps of calculating the overall efficiency of the power system at different vehicle speeds when the drive motor torque is Tm in gear i and the overall efficiency of the power system at different vehicle speeds when the drive motor torque is Tm' in gear i + 1, obtain the shift speeds corresponding to each drive motor torque Tm, and form a shift law curve from gear i to gear i + 1;

[0010] Change the current gear i, repeat the above calculation process, and finally obtain the shift laws for all gears in pure electric mode.

[0011] Combined with the first aspect, in an implementation manner, based on each driving mode of the vehicle, for the current gear i in each mode, traverse the torque combinations of the adjacent gear i + 1, respectively calculate the overall efficiency curves of the power system for the current gear and the adjacent gear, use the vehicle speed at the intersection of the two curves as the shift point, and generate the shift laws for each mode, including:

[0012] When the vehicle is in hybrid mode, set the current gear to gear i, give any combination of drive motor torque Tm and engine torque Te, calculate the combination of drive motor torque Tm' and engine torque Te' corresponding to the adjacent higher gear i + 1, calculate the overall efficiency of the power system at different vehicle speeds when the drive motor torque is Tm and the engine torque is Te in gear i and calculate the overall efficiency of the power system at different vehicle speeds when the drive motor torque is Tm' and the engine torque is Te' in gear i + 1, and select the vehicle speed at the intersection of the two overall efficiency curves as the shift speed under the combination of drive motor torque Tm and engine torque Te;

[0013] For all possible combinations of drive motor torque Tm and engine torque Te in hybrid mode in gear i, repeat the steps of calculating the overall efficiency of the power system at different vehicle speeds when the combination of drive motor torque Tm and engine torque Te is in gear i and the overall efficiency of the power system at different vehicle speeds when the combination of drive motor torque Tm' and engine torque Te' is in gear i + 1, obtain the shift speeds corresponding to each combination of drive motor torque Tm and engine torque Te, and form a shift law curve from gear i to gear i + 1;

[0014] Change the current gear i, repeat the above calculation process, and finally obtain the shift laws for all gears in hybrid mode.

[0015] In combination with the first aspect, in one embodiment, based on the various driving modes of the vehicle, for the current gear i in each mode, traverse the torque combinations of the adjacent gear i+1, calculate the comprehensive efficiency curves of the power system for the current gear and the adjacent gear respectively, and use the vehicle speed at the intersection of the two curves as the shift point to generate the shift law for each mode, including:

[0016] When the vehicle is in the engine direct drive mode, set the current gear to i, given any engine torque Te, calculate the corresponding engine torque Te' of the adjacent higher gear i+1, calculate the comprehensive efficiency of the power system at different vehicle speeds when the engine torque is Te in gear i, and calculate the comprehensive efficiency of the power system at different vehicle speeds when the engine torque is Te' in gear i+1, and select the vehicle speed at the intersection of the two comprehensive efficiency curves as the shift vehicle speed under the engine torque Te;

[0017] For all possible combinations of the engine torque Te in gear i of the engine direct drive mode, repeat the steps of calculating the comprehensive efficiency of the power system at different vehicle speeds when the engine torque is Te in gear i and the comprehensive efficiency of the power system at different vehicle speeds when the engine torque is Te' in gear i+1 to obtain the shift vehicle speed corresponding to the engine torque Te, and form the shift law curve from gear i to gear i+1;

[0018] Change the current gear i, repeat the above calculation process, and finally obtain the shift law for all gears in the engine direct drive mode.

[0019] In combination with the first aspect, in one embodiment, based on the various driving modes of the vehicle, for the current gear i in each mode, traverse the torque combinations of the adjacent gear i+1, calculate the comprehensive efficiency curves of the power system for the current gear and the adjacent gear respectively, and use the vehicle speed at the intersection of the two curves as the shift point to generate the shift law for each mode, including:

[0020] When the vehicle is in the driving and charging mode, set the current gear to i, given any combination of the driving motor torque Tm and the engine torque Te, calculate the corresponding combination of the driving motor torque Tm' and the engine torque Te' of the adjacent higher gear i+1, calculate the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque is Tm and the engine torque is Te in gear i, and calculate the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque is Tm' and the engine torque is Te' in gear i+1, and select the vehicle speed at the intersection of the two comprehensive efficiency curves as the shift vehicle speed under the combination of the driving motor torque Tm and the engine torque Te;

[0021] For all possible combinations of the drive motor torque Tm and the engine torque Te in the first gear of the driving and charging mode, repeat the steps of calculating the combined efficiency of the powertrain at different vehicle speeds for the combination of the drive motor torque Tm and the engine torque Te in the first gear, and the combined efficiency of the powertrain at different vehicle speeds for the drive motor torque Tm' and the engine torque Te' in the (i + 1)-th gear, to obtain the shift speeds corresponding to each combination of the drive motor torque Tm and the engine torque Te, and form a shift law curve for shifting from the i-th gear to the (i + 1)-th gear;

[0022] Change the current gear i, repeat the above calculation process, and finally obtain the shift laws for all gears in the hybrid mode.

[0023] Combined with the first aspect, in one implementation, based on each driving mode of the vehicle, for the current gear i in each mode, traverse the torque combinations of the adjacent gear i + 1, calculate the combined efficiency curves of the powertrain for the current gear and the adjacent gear respectively, and use the vehicle speed at the intersection of the two curves as the shift point to generate the shift laws for each mode, including:

[0024] When the vehicle is in the regenerative braking mode, set the current gear to the i-th gear, give any drive motor braking torque Tm, calculate the corresponding drive motor braking torque Tm' in the adjacent lower gear i - 1, calculate the combined efficiency of the powertrain at different vehicle speeds for the drive motor braking torque Tm in the i-th gear, and the combined efficiency of the powertrain at different vehicle speeds for the drive motor braking torque Tm' in the (i - 1)-th gear, and select the vehicle speed at the intersection of the two combined efficiency curves as the shift speed for the drive motor braking torque Tm;

[0025] For all possible drive motor braking torques Tm in the i-th gear of the regenerative braking mode, repeat the steps of calculating the combined efficiency of the drive motor braking torque Tm in the i-th gear and the combined efficiency of the drive motor braking torque Tm' in the (i - 1)-th gear, to obtain the shift speeds corresponding to each Tm, and form a shift law curve for shifting from the i-th gear to the (i - 1)-th gear;

[0026] Change the current gear i, repeat the above calculation process, and finally generate the shift laws for all gears in the regenerative braking mode.

[0027] In a second aspect, an embodiment of the present application provides an economical shifting device, and the economical shifting device includes:

[0028] A shift law calculation module, which is used to, based on each driving mode of the vehicle, for the current gear i in each mode, traverse the torque combinations of the adjacent gear i + 1, calculate the combined efficiency curves of the powertrain for the current gear and the adjacent gear respectively, and use the vehicle speed at the intersection of the two curves as the shift point to generate the shift laws for each mode.

[0029] In combination with the second aspect, in one embodiment, the shift schedule calculation module is further configured to, when the vehicle is in pure electric driving mode, set the current gear to gear i, then give any driving motor torque Tm, calculate the driving motor torque Tm' corresponding to the adjacent higher gear i+1, calculate the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque is Tm in gear i and the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque is Tm' in gear i+1, and select the vehicle speed at the intersection of the two comprehensive efficiency curves as the shift vehicle speed under the driving motor torque Tm; for all possible driving motor torques Tm in pure electric mode in gear i, repeat the steps of calculating the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque is Tm in gear i and the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque is Tm' in gear i+1, obtain the shift vehicle speeds corresponding to each driving motor torque Tm, and form a shift schedule curve from gear i to gear i+1; change the current gear i, repeat the above calculation process, and finally obtain the shift schedules for all gears in pure electric mode.

[0030] In a third aspect, an embodiment of the present application provides an economy shift device, which includes a processor, a memory, and an economy shift program stored on the memory and executable by the processor. When the economy shift program is executed by the processor, the steps of the economy shift method described in some of the above embodiments are implemented.

[0031] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which an economy shift program is stored. When the economy shift program is executed by a processor, the steps of the economy shift method described in some of the above embodiments are implemented.

[0032] The beneficial effects brought by the technical solutions provided in the embodiments of the present application include:

[0033] Based on various driving modes of the vehicle, for the current gear i in each mode, traverse the torque combinations of the adjacent gear i+1, calculate the comprehensive efficiency curves of the power system of the current gear and the adjacent gear respectively, and use the vehicle speed at the intersection of the two curves as the shift point to ensure that the power source (such as the engine, driving motor) always operates in the high-efficiency range after shifting, improve the overall system efficiency, shift gears based on the vehicle speed at the intersection of the efficiency curves of adjacent gears, reduce the power interruption and impact during the shifting process, and at the same time take into account fuel economy and driving comfort. By pre-calculating the efficiency curves and shift points in each mode, the real-time operation load is reduced, which meets the fast response requirements of the embedded system. Description of the Drawings

[0034] Figure 1 It is a schematic flowchart of an embodiment of the economy shift method of the present application;

[0035] Figure 2 Schematic diagram of the curve of the comprehensive efficiency of the drive system at different vehicle speeds in the 1st and 2nd gears in the pure electric driving mode;

[0036] Figure 3 Schematic diagram of the hardware structure of the economic shift device involved in the solution of the embodiment of the present application. Detailed implementation manners

[0037] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0038] The embodiments of the present application provide an economic shift method, device, equipment and computer-readable storage medium, which can solve the technical problem in the related art that the traditional constant-speed shift rule does not consider the drive mode of a specific hybrid power system, resulting in that each power source does not fully exert its excellent efficiency performance and causing a certain degree of waste of fuel during the driving process of the vehicle.

[0039] To make the purpose, technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0040] In a first aspect, the embodiments of the present application provide an economic shift method.

[0041] In one embodiment, referring to Figure 1 , Figure 1 is the flow chart of the first embodiment of the economic shift method of the present application. As shown in Figure 1 , the economic shift method includes:

[0042] S100: Based on each driving mode of the vehicle, for the current gear i in each mode, traverse the torque combinations of the adjacent gear i + 1, calculate the comprehensive efficiency curves of the power system of the current gear and the adjacent gear respectively, use the vehicle speed at the intersection of the two curves as the shift point, and generate the shift rules for each mode.

[0043] In this embodiment, based on the various driving modes of the vehicle, for the current gear i in each mode, traverse the torque combinations of the adjacent gear i+1, and calculate the comprehensive efficiency curves of the power system for the current gear and the adjacent gear respectively. Use the vehicle speed at the intersection of the two curves as the shifting point to ensure that the power source (such as the engine and the drive motor) always operates in the high-efficiency range after shifting, improving the overall system efficiency. Shifting gears based on the vehicle speed at the intersection of the efficiency curves of adjacent gears can reduce the power interruption and impact during the shifting process, while taking into account fuel economy and driving comfort. By pre-calculating the efficiency curves and shifting points in each mode, the real-time operation load is reduced, which is suitable for the fast response requirements of the embedded system.

[0044] Further, in one embodiment, in S100, the following steps are included:

[0045] S101-1: When the vehicle is in the pure electric driving mode, set the current gear to gear i, then give any drive motor torque Tm, calculate the drive motor torque Tm' corresponding to the adjacent higher gear i+1, calculate the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque is Tm in gear i, and calculate the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque is Tm' in gear i+1. Select the vehicle speed at the intersection of the two comprehensive efficiency curves as the shifting vehicle speed under the drive motor torque Tm.

[0046] S101-2: For all possible drive motor torques Tm in gear i of the pure electric mode, repeat the steps of calculating the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque is Tm in gear i and the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque is Tm' in gear i+1, to obtain the shifting vehicle speeds corresponding to each drive motor torque Tm, and form a shifting law curve from gear i to gear i+1.

[0047] S101-3: Change the current gear i, and repeat the above calculation process to finally obtain the shifting laws of all gears in the pure electric mode.

[0048] In this embodiment, take a planetary row dual-motor hybrid transmission as an example for illustration. In this planetary row hybrid, the engine is connected to the planet carrier, the generator is connected to the sun gear, the drive motor is coupled with the engine at the ring gear for output, and the drive motor output is a two-speed structure, with a first gear ratio of 6.127 and a second gear ratio of 2.789, and the planetary row characteristic test is 2.656. When the vehicle is in the pure electric driving mode, set the current gear to the first gear (gear ratio 6.127), then give any drive motor torque such as 120 N·m, calculate the drive motor torque 263.6 N·m corresponding to the adjacent higher gear, the second gear (gear ratio 2.789) (calculated according to the wheel end demand of the first gear using the second gear ratio), and calculate the comprehensive efficiency of the drive system at different vehicle speeds (vehicle speed from creep 5 km / h to the vehicle speed corresponding to the maximum speed of the drive motor) when the drive motor torque is 120 N·m in the first gear, as shown in Table 1 below:

[0049] Rotational speed (rpm) Vehicle speed (km / h) Torque (N·m) Output power (kW) Motor efficiency (%) 1000 5 120 12.8 89.69 1500 7 120 19.1 92.35 2000 9 120 25.2 93.57 2500 12 120 30.8 94.87 3000 14 120 64.8 94.17 3500 17 120 72.5 95.02 4000 19 120 49.5 96.38 4500 21 120 96.6 95.21 5000 24 120 64.6 96.6 5500 26 120 71.2 96.16 6000 28 120 77.5 95.62 6500 31 120 83.7 95.35 7000 33 120 90.2 94.87 7500 36 120 96.7 94.39 8000 38 120 103.4 93.58 8500 40 120 109.5 92.89 9000 43 120 115.1 91.92 9500 45 120 118.6 90.75

[0050] Table 1

[0051] And the comprehensive efficiency of the drive system at different vehicle speeds (vehicle speed from creep 5 km / h to the vehicle speed corresponding to the maximum speed of the drive motor) when the drive motor torque is 263.6 N·m in the second gear is as shown in Table 2 below:

[0052] Rotational speed (rpm) Vehicle speed (km / h) Torque (N·m) Output power (kW) Motor efficiency (%) 500 5 258.8 13.6 74.93 1000 10 256.3 26.8 83.47 1500 16 254.4 40 87.94 2000 21 252 52.8 90.33 2500 26 258.5 67.6 91.98 3000 31 258.1 81.1 93.06 3500 36 250.9 92 94.04 4000 42 258 108 94.31 4500 47 257.4 121.3 93.52

[0053] Table 2

[0054] According to the above efficiency Table 1, the efficiency curve S1 at different vehicle speeds is made, and according to efficiency Table 2, the efficiency curve S2 at different vehicle speeds is made. As Figure 2 shown, select Figure 2 The vehicle speed of 22 km / h at the intersection of the two comprehensive efficiency curves as the shift vehicle speed under the drive motor torque N·m. Subsequently, for all possible drive motor torques Tm in the pure electric mode first gear, repeat the steps of calculating the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque is Tm in the first gear and the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque is Tm' in the second gear, and obtain the shift vehicle speeds corresponding to each drive motor torque Tm, forming a shift law curve from the first gear to the second gear; if there are more gears (such as the third gear), the current gear can be changed to the second gear, and the above calculation process can be repeated to finally obtain the shift law of all gears in the pure electric mode.

[0055] Furthermore, in one embodiment, in S100, the following steps are included:

[0056] S102-1: When the vehicle is in the hybrid mode, set the current gear to the i-th gear, give any combination of the drive motor torque Tm and the engine torque Te, calculate the combination of the drive motor torque Tm' and the engine torque Te' corresponding to the adjacent higher gear i+1, calculate the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque is Tm and the engine torque is Te in the i-th gear, and calculate the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque is Tm' and the engine torque is Te' in the i+1-th gear, and select the vehicle speed at the intersection of the two comprehensive efficiency curves as the shift vehicle speed under the combination of the drive motor torque Tm and the engine torque Te;

[0057] S102-2: For all possible combinations of the drive motor torque Tm and the engine torque Te in the hybrid mode at gear i, repeat the steps of calculating the combined efficiency of the powertrain at different vehicle speeds when the combination of the drive motor torque Tm and the engine torque Te is at gear i, and the combined efficiency of the powertrain at different vehicle speeds when the drive motor torque Tm' and the engine torque Te' are at gear i+1, to obtain the shift speeds corresponding to each combination of the drive motor torque Tm and the engine torque Te, and form a shift law curve for shifting from gear i to gear i+1;

[0058] S102-3: Change the current gear i, repeat the above calculation process, and finally obtain the shift laws for all gears in the hybrid mode.

[0059] In this embodiment, through the technical means of S102-1, S102-2, and S102-3, by comparing the combined efficiency (fuel efficiency + electrical efficiency) of the engine and the drive motor between adjacent gears, the gear with higher efficiency is dynamically selected, reducing the overall energy consumption and significantly improving the economy of the hybrid vehicle.

[0060] Further, in one embodiment, in S100, the following steps are included:

[0061] S103-1: When the vehicle is in the engine direct drive mode, set the current gear at gear i, given any engine torque Te, calculate the corresponding engine torque Te' at the adjacent higher gear i+1, calculate the combined efficiency of the powertrain at different vehicle speeds when the engine torque Te is at gear i, and calculate the combined efficiency of the powertrain at different vehicle speeds when the engine Te' is at gear i+1, and select the vehicle speed at the intersection of the two combined efficiency curves as the shift speed under the engine torque Te;

[0062] S103-2: For all possible combinations of the engine torque Te in the engine direct drive mode at gear i, repeat the steps of calculating the combined efficiency of the powertrain at different vehicle speeds when the engine torque Te is at gear i and the combined efficiency of the powertrain at different vehicle speeds when the engine torque Te' is at gear i+1, to obtain the shift speeds corresponding to the engine torque Te, and form a shift law curve for shifting from gear i to gear i+1;

[0063] S103-3: Change the current gear i, repeat the above calculation process, and finally obtain the shift laws for all gears in the engine direct drive mode.

[0064] In this embodiment, through the technical means of S103-1, S103-2, and S103-3, through the shift decision dominated by the engine efficiency and the full operating condition torque coverage, the economy in the direct drive mode is achieved.

[0065] Further, in one embodiment, in S100, the following steps are included:

[0066] S104-1: When the vehicle is in the driving and charging mode, set the current gear to gear i, given any combination of the driving motor torque Tm and the engine torque Te, calculate the combination of the driving motor torque Tm' and the engine torque Te' corresponding to the adjacent higher gear i + 1, calculate the overall efficiency of the power system at different vehicle speeds when the driving motor torque is Tm and the engine torque is Te in gear i, and calculate the overall efficiency of the power system at different vehicle speeds when the driving motor torque is Tm' and the engine torque is Te' in gear i + 1, and select the vehicle speed at the intersection of the two overall efficiency curves as the shift speed under the combination of the driving motor torque Tm and the engine torque Te;

[0067] S104-2: For all possible combinations of the driving motor torque Tm and the engine torque Te in gear i of the driving and charging mode, repeat the steps of calculating the overall efficiency of the power system at different vehicle speeds when the driving motor torque is Tm and the engine torque is Te in gear i and the overall efficiency of the power system at different vehicle speeds when the driving motor torque is Tm' and the engine torque is Te' in gear i + 1, obtain the shift speeds corresponding to each combination of the driving motor torque Tm and the engine torque Te, and form a shift law curve from gear i to gear i + 1;

[0068] S104-3: Change the current gear i, repeat the above calculation process, and finally obtain the shift laws of all gears in the hybrid mode.

[0069] In this embodiment, by means of the technical means of S104-1, S104-2, and S104-3, in the driving and charging mode, the engine needs to drive the vehicle and generate electricity at the same time. S104 dynamically adjusts the gear to ensure that the engine operates in its high-efficiency area (such as medium-high load and stable speed), while optimizing the power generation efficiency of the motor and reducing the overall energy loss. If the engine is in the low-efficiency area (such as low speed and high load) in gear i, after upshifting (to gear i + 1), by reducing the speed ratio, the engine speed is reduced to the high-efficiency range (such as 2000 rpm → 1500 rpm). At this time, the fuel efficiency of the engine is improved (BSFC is reduced by 5% - 10%), the power generation power of the driving motor is stable, and the iron loss and copper loss are reduced (the motor efficiency is increased by 2% - 3%).

[0070] Further, in one embodiment, in S100, the following steps are included:

[0071] S105-1: When the vehicle is in the regenerative braking mode, set the current gear to the i-th gear, give any driving motor braking torque Tm, calculate the driving motor braking torque Tm' corresponding to the adjacent lower gear i-1, calculate the overall efficiency of the power system at different vehicle speeds when the driving motor braking torque is Tm in the i-th gear, and the overall efficiency of the power system at different vehicle speeds when the driving motor braking torque is Tm' in the i-1-th gear, and select the vehicle speed at the intersection of the two overall efficiency curves as the shift speed under the driving motor braking torque Tm;

[0072] S105-2: For all possible driving motor braking torques Tm in the i-th gear of the regenerative braking mode, repeat the steps of calculating the overall efficiency of the driving motor braking torque Tm in the i-th gear and the overall efficiency of the driving motor braking torque Tm' in the i-1-th gear, obtain the shift speeds corresponding to each Tm, and form a shift law curve from the i-th gear to the i-1-th gear;

[0073] S105-3: Change the current gear i, repeat the above calculation process, and finally generate the shift laws for all gears in the regenerative braking mode.

[0074] In this embodiment, through the technical means of S105-1, S105-2, and S105-3, by comparing the overall efficiency of the motor braking torque under adjacent gears, the gear with higher regenerative braking efficiency is dynamically selected to improve the energy recovery rate.

[0075] Further, in one embodiment, the steps of S101 (S101-1, S101-2, and S101-3), S102 (S102-1, S102-2, and S102-3), S103 (S103-1, S103-2, and S103-3), S104 (S104-1, S104-2, and S104-3), and S105 (S105-1, S105-2, and S105-3) have no sequence relationship.

[0076] In a second aspect, the embodiments of the present application further provide an economical shift device, where the economical shift device includes: a shift law calculation module, which is used to traverse the torque combinations of the adjacent gear i+1 for the current gear i in each driving mode of the vehicle based on the driving modes of the vehicle, calculate the overall efficiency curves of the power system of the current gear and the adjacent gear respectively, and use the vehicle speed at the intersection of the two curves as the shift point to generate the shift laws for each mode.

[0077] Further, in one embodiment, the shift schedule calculation module is further configured to, when the vehicle is in pure electric driving mode, set the current gear to gear i, then given any drive motor torque Tm, calculate the drive motor torque Tm' corresponding to the adjacent higher gear i+1, calculate the overall efficiency of the powertrain at different vehicle speeds when the drive motor torque is Tm in gear i and the overall efficiency of the powertrain at different vehicle speeds when the drive motor torque is Tm' in gear i+1, select the vehicle speed at the intersection of the two overall efficiency curves as the shift vehicle speed under the drive motor torque Tm; for all possible drive motor torques Tm in pure electric mode in gear i, repeat the steps of calculating the overall efficiency of the powertrain at different vehicle speeds when the drive motor torque is Tm in gear i and the overall efficiency of the powertrain at different vehicle speeds when the drive motor torque is Tm' in gear i+1, obtain the shift vehicle speeds corresponding to each drive motor torque Tm, and form a shift schedule curve from gear i to gear i+1; change the current gear i, repeat the above calculation process, and finally obtain the shift schedule for all gears in pure electric mode.

[0078] Among them, the functions of each module in the above economic shift device correspond to the steps in the above embodiment of the economic shift method, and their functions and implementation processes will not be described in detail here.

[0079] In a third aspect, an embodiment of the present application provides an economic shift device, which may be a device with data processing functions such as a personal computer (PC), a laptop computer, a server, etc.

[0080] Refer to Figure 3 , Figure 3 which is a schematic hardware structure diagram of the economic shift device involved in the embodiment of the present application. In the embodiment of the present application, the economic shift device may include a processor, a memory, a communication interface, and a communication bus.

[0081] Among them, the communication bus can be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0082] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces, etc., which are used to implement the interconnection of components inside the economic shift device, as well as interfaces used to implement the interconnection of the economic shift device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0083] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical memory, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0084] The processor can be a general-purpose processor, which can call the economic shift program stored in the memory and execute the economic shift method provided by the embodiments of the present application. For example, the general-purpose processor can be a central processing unit (CPU). Among them, the method executed when the economic shift program is called can refer to the various embodiments of the economic shift method of the present application, which will not be elaborated here.

[0085] Those skilled in the art can understand that Figure 3 the hardware structure shown in does not constitute a limitation to the present application, and may include more or fewer components than shown, or combine some components, or different component arrangements.

[0086] In a fourth aspect, the embodiments of the present application further provide a readable storage medium.

[0087] The economic shift program is stored on the readable storage medium of the present application. When the economic shift program is executed by a processor, the steps of the economic shift method as described above are implemented.

[0088] Among them, the method implemented when the economic shift program is executed can refer to the various embodiments of the economic shift method of the present application, which will not be elaborated here.

[0089] It should be noted that the serial numbers of the above embodiments of the present application are only for description and do not represent the superiority or inferiority of the embodiments.

[0090] In the description of the specification, claims and the above-mentioned drawings of the present application, the terms "comprising", "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices. Descriptions such as "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit that "first", "second" and "third" are different types.

[0091] In the description of the embodiments of the present application, words such as "exemplary", "for example" or "for instance" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary", "for example" or "for instance" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "for example" or "for instance" is intended to present relevant concepts in a specific manner.

[0092] In the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B; "and / or" in the text is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality of" means two or more than two.

[0093] In some processes described in the embodiments of the present application, a plurality of operations or steps appear in a specific order. However, it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or may be executed in parallel. The serial numbers of the operations are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0094] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium as described above (such as ROM / RAM, magnetic disk, optical disc), and includes several instructions to enable a terminal device to execute the methods described in the various embodiments of the present application.

[0095] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. An economical shifting method, characterized in that: The economical shifting method comprises: Based on the vehicle's driving modes, for the current gear i in each mode, the torque combination of the adjacent gear i+1 is traversed, and the comprehensive efficiency curves of the power system of the current gear and the adjacent gear are calculated respectively. The vehicle speed at the intersection of the two curves is used as the shift point to generate the shift rules in each mode.

2. The economical shifting method according to claim 1, characterized in that: Based on each driving mode of the vehicle, for the current gear i in each mode, the torque combination of the adjacent gear i+1 is traversed, the comprehensive efficiency curves of the power system of the current gear and the adjacent gear are calculated respectively, and the vehicle speed at the intersection of the two curves is used as the shift point to generate the shift rules in each mode, including: When the vehicle is in pure electric driving mode, the current gear is set to gear i, and then any driving motor torque Tm is given, and the driving motor torque Tm' corresponding to the adjacent high gear i+1 is calculated, and the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque Tm is in gear i and the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque Tm' is in gear i+1 are calculated, and the vehicle speed at the intersection of the two comprehensive efficiency curves is selected as the gear shifting speed under the driving motor torque Tm; For all possible drive motor torques Tm in pure electric mode i gear, repeatedly calculate the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque Tm is in i gear and the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque Tm' is in i+1 gear, obtain the gear shifting speed corresponding to each drive motor torque Tm, and form a gear shifting regularity curve from i gear to i+1 gear; Change the current gear i, repeat the above calculation process, and finally get the shifting rules for all gears in pure electric mode.

3. The economical shifting method according to claim 1, characterized in that: Based on each driving mode of the vehicle, for the current gear i in each mode, the torque combination of the adjacent gear i+1 is traversed, the comprehensive efficiency curves of the power system of the current gear and the adjacent gear are calculated respectively, and the vehicle speed at the intersection of the two curves is used as the shift point to generate the shift rules in each mode, including: When the vehicle is in hybrid mode, the current gear is set to gear i, given any combination of the drive motor torque Tm and the engine torque Te, the combination of the drive motor torque Tm' and the engine torque Te' corresponding to the adjacent high gear i+1 is calculated, the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque Tm and the engine torque Te are in gear i is calculated, and the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque Tm' and the engine torque Te' are in gear i+1 is calculated, and the vehicle speed at the intersection of the two comprehensive efficiency curves is selected as the shifting speed under the combination of the drive motor torque Tm and the engine torque Te; For all possible combinations of the drive motor torque Tm and the engine torque Te in gear i of the hybrid mode, the steps of calculating the comprehensive efficiency of the power system at different vehicle speeds for the combination of the drive motor torque Tm and the engine torque Te in gear i and the comprehensive efficiency of the power system at different vehicle speeds for the combination of the drive motor torque Tm' and the engine torque Te' in gear i+1 are repeated to obtain the gear shifting speed corresponding to each combination of the drive motor torque Tm and the engine torque Te, and form a gear shifting regularity curve from gear i to gear i+1; Change the current gear i, repeat the above calculation process, and finally get the shifting rules for all gears in hybrid mode.

4. The economical shifting method according to claim 1, characterized in that: Based on each driving mode of the vehicle, for the current gear i in each mode, the torque combination of the adjacent gear i+1 is traversed, the comprehensive efficiency curves of the power system of the current gear and the adjacent gear are calculated respectively, and the vehicle speed at the intersection of the two curves is used as the shift point to generate the shift rules in each mode, including: When the vehicle is in the engine direct drive mode, the current gear is set to gear i, given any engine torque Te, the engine torque Te' corresponding to the adjacent high gear i+1 is calculated, the comprehensive efficiency of the power system at different vehicle speeds when the engine torque Te is in gear i is calculated, and the comprehensive efficiency of the power system at different vehicle speeds when the engine Te' is in gear i+1 is calculated, and the vehicle speed at the intersection of the two comprehensive efficiency curves is selected as the gear shifting speed under the engine torque Te; For all possible combinations of engine torque Te in gear i of the engine direct drive driving mode, the steps of calculating the comprehensive efficiency of the power system at different vehicle speeds when the engine torque Te is in gear i and the comprehensive efficiency of the power system at different vehicle speeds when the engine torque Te' is in gear i+1 are repeated to obtain the gear shifting speed corresponding to the engine torque Te, and form a gear shifting regularity curve from gear i to gear i+1; Change the current gear i, repeat the above calculation process, and finally obtain the shifting rules of all gears in the engine direct drive mode.

5. The economical shifting method according to claim 1, characterized in that: Based on each driving mode of the vehicle, for the current gear i in each mode, the torque combination of the adjacent gear i+1 is traversed, the comprehensive efficiency curves of the power system of the current gear and the adjacent gear are calculated respectively, and the vehicle speed at the intersection of the two curves is used as the shift point to generate the shift rules in each mode, including: When the vehicle is in driving charging mode, the current gear is set to gear i, given any combination of drive motor torque Tm and engine torque Te, the combination of drive motor torque Tm' and engine torque Te' corresponding to the adjacent high gear i+1 is calculated, the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque Tm and engine torque Te are in gear i is calculated, and the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque Tm' and engine torque Te' are in gear i+1 is calculated, and the vehicle speed at the intersection of the two comprehensive efficiency curves is selected as the shifting speed under the combination of drive motor torque Tm and engine torque Te; For all possible combinations of the drive motor torque Tm and the engine torque Te in gear i of the driving charging mode, the steps of calculating the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque Tm and the engine torque Te are in gear i and the comprehensive efficiency of the power system at different vehicle speeds when the drive motor torque Tm' and the engine torque Te' are in gear i+1 are repeated to obtain the gear shifting speed corresponding to each combination of the drive motor torque Tm and the engine torque Te, and form a gear shifting regularity curve from gear i to gear i+1; Change the current gear i, repeat the above calculation process, and finally get the shifting rules for all gears in hybrid mode.

6. The economical shifting method according to claim 1, characterized in that: Based on each driving mode of the vehicle, for the current gear i in each mode, the torque combination of the adjacent gear i+1 is traversed, the comprehensive efficiency curves of the power system of the current gear and the adjacent gear are calculated respectively, and the vehicle speed at the intersection of the two curves is used as the shift point to generate the shift rules in each mode, including: When the vehicle is in the regenerative braking mode, the current gear is set to gear i, and any driving motor braking torque Tm is given, and the driving motor braking torque Tm' corresponding to the adjacent low gear i-1 is calculated, and the comprehensive efficiency of the power system at different vehicle speeds when the driving motor braking torque Tm is in gear i, and the comprehensive efficiency of the power system at different vehicle speeds when the driving motor braking torque Tm' is in gear i-1 are calculated, and the vehicle speed at the intersection of the two comprehensive efficiency curves is selected as the shifting speed under the driving motor braking torque Tm; For all possible driving motor braking torques Tm in gear i of the regenerative braking mode, the steps of calculating the comprehensive efficiency of the driving motor braking torque Tm in gear i and the comprehensive efficiency of the driving motor braking torque Tm' in gear i-1 are repeated to obtain the gear shifting speed corresponding to each Tm, and form a gear shifting regularity curve from gear i to gear i-1; Change the current gear i, repeat the above calculation process, and finally generate the shifting rules for all gears in the regenerative braking mode.

7. An economical gear shifting device, characterized in that: The economical shifting device comprises: The gear shifting pattern calculation module is used to traverse the torque combination of the adjacent gear i+1 for the current gear i in each mode based on the vehicle's various driving modes, calculate the comprehensive efficiency curves of the power system of the current gear and the adjacent gear respectively, and use the vehicle speed at the intersection of the two curves as the gear shifting point to generate the gear shifting pattern in each mode.

8. The economical shifting device according to claim 7, characterized in that: The shifting rule calculation module is also used to set the current gear at gear i when the vehicle is in pure electric driving mode, and then give any driving motor torque Tm, calculate the driving motor torque Tm' corresponding to the adjacent high gear i+1, calculate the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque Tm is in gear i and the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque Tm' is in gear i+1, and select the vehicle speed at the intersection of the two comprehensive efficiency curves as the shifting speed under the driving motor torque Tm; for all possible driving motor torques Tm in gear i in pure electric mode, repeat the steps of calculating the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque Tm is in gear i and the comprehensive efficiency of the power system at different vehicle speeds when the driving motor torque Tm' is in gear i+1, obtain the shifting speed corresponding to each driving motor torque Tm, and form a shifting rule curve from gear i to gear i+1; change the current gear i, repeat the above calculation process, and finally obtain the shifting rule for all gears in pure electric mode.

9. An economical gear shifting device, characterized in that: The economical shifting device includes a processor, a memory, and an economical shifting program stored in the memory and executable by the processor, wherein when the economical shifting program is executed by the processor, the steps of the economical shifting method as described in any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium, characterized in that: An economical gear shifting program is stored on the computer-readable storage medium, wherein when the economical gear shifting program is executed by the processor, the steps of the economical gear shifting method as claimed in any one of claims 1 to 6 are implemented.

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