A gear decision method, power assembly and computer storage medium

Abstract

Embodiments of the present application provide a gear decision method, a power assembly and a computer storage medium. The gear decision method comprises: obtaining a plurality of driving conditions; determining a first specific fuel consumption corresponding to all gears in each driving condition; selecting a gear corresponding to the minimum first specific fuel consumption among all first specific fuel consumption in the same driving condition as a target gear of the corresponding driving condition; and adjusting the target gear when the switching sequence of the target gears of two adjacent driving conditions does not conform to a preset sequence, so that the switching sequence of the target gears of the two adjacent driving conditions conforms to the preset sequence. The gear decision method provided by the embodiments of the present application saves the fuel consumption by calculating and selecting the gear corresponding to the minimum first specific fuel consumption as the target gear of the corresponding driving condition, and correcting the corresponding gear according to the preset sequence of the target gears of the actual two adjacent driving conditions, so that the actual shifting demand is met, and the economic optimal mode is embodied.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicles, in particular to a gear decision method, a power assembly and a computer storage medium. BACKGROUND

[0002] In the related art, there is no target gear decision method for a hybrid power driving system. SUMMARY

[0003] Therefore, embodiments of the present application provide a gear decision method, a power assembly and a computer storage medium, which can comprehensively determine a target gear decision method based on an economic optimal mode and a hybrid power driving system sequential gear shifting characteristic.

[0004] Embodiments of the present application provide a gear decision method, which comprises:

[0005] obtaining a plurality of driving conditions;

[0006] determining a first specific fuel consumption of all gears in each driving condition;

[0007] selecting a gear corresponding to the minimum first specific fuel consumption among all first specific fuel consumptions in the same driving condition as a target gear of the corresponding driving condition;

[0008] adjusting the target gear to make the switching sequence of the target gears of the adjacent two driving conditions comply with the preset sequence when the switching sequence of the target gears of the adjacent two driving conditions does not comply with the preset sequence.

[0009] In some embodiments, adjusting the target gear to make the switching sequence of the target gears of the adjacent two driving conditions comply with the preset sequence comprises: replacing the target gear to make the switching sequence of the target gears of the adjacent two driving conditions comply with the preset sequence.

[0010] In some embodiments, the ratio of the difference between the first specific fuel consumption corresponding to the replaced target gear and the first specific fuel consumption corresponding to the original target gear to the first specific fuel consumption corresponding to the replaced target gear is not greater than 3% in the same driving condition.

[0011] In some embodiments, the driving condition corresponding to the target gear whose switching sequence does not comply with the preset sequence is a first driving condition, and adjusting the target gear to make the switching sequence of the target gears of the adjacent two driving conditions comply with the preset sequence comprises:

[0012] at least one driving condition is added between the adjacent two first driving conditions, and the added driving condition is a second driving condition;

[0013] determining the first specific fuel consumption of all gears in each second driving condition;

[0014] In all the first specific fuel consumptions in the same second driving condition, the gear corresponding to the minimum first specific fuel consumption is selected as the target gear of the corresponding second driving condition, so that the switching sequence of the target gears of the adjacent two driving conditions conforms to the preset sequence.

[0015] According to the gear decision method described in the above embodiments, the driving condition includes wheel end power and vehicle speed.

[0016] In some embodiments, the first specific fuel consumption is the specific fuel consumption at the wheel end, and in each driving condition, the first specific fuel consumption corresponding to all gears is determined, including:

[0017] In the series gear, when the state of charge remains unchanged, the engine effective power is obtained according to the wheel end power, the first motor drive efficiency, the second motor generation efficiency, and the transmission efficiency;

[0018] According to the engine effective power and the engine universal characteristic curve, the second specific fuel consumption is determined, which is the minimum specific fuel consumption corresponding to the engine effective power;

[0019] According to the second specific fuel consumption, the first motor drive efficiency, the second motor generation efficiency, and the transmission efficiency, the first specific fuel consumption in the series gear is obtained.

[0020] In some embodiments, the first specific fuel consumption is the specific fuel consumption at the wheel end, and in each driving condition, the first specific fuel consumption corresponding to all gears is determined, including:

[0021] In each gear of the engine direct drive mode, the engine speed is obtained according to the vehicle speed;

[0022] In each gear of the engine direct drive mode, the engine torque is determined according to the wheel end power and the engine speed;

[0023] In each gear of the engine direct drive mode, the third specific fuel consumption is obtained according to the engine universal characteristic curve, the engine speed, and the engine torque, which is the specific fuel consumption of the engine in the corresponding gear;

[0024] According to the third specific fuel consumption and the gear corresponding transmission efficiency, the first specific fuel consumption in each gear of the engine direct drive mode gear is obtained.

[0025] The embodiments of the present application also provide a power assembly, including:

[0026] The acquisition module is configured to acquire a plurality of driving conditions;

[0027] The determination module is configured to determine, in each driving condition, the first specific fuel consumption corresponding to all gears;

[0028] The selection module is used to select the gear with the smallest first ratio fuel consumption among all first ratio fuel consumptions under the same driving conditions as the target gear for the corresponding driving conditions.

[0029] The adjustment module is used to adjust the target gears so that the switching order of the target gears in two adjacent driving conditions conforms to the preset order when the switching order of the target gears in two adjacent driving conditions does not match the preset order.

[0030] This application also provides a powertrain including a memory and a processor. The memory stores executable instructions that can run on the processor, and the processor executes the program to implement the steps of any of the methods described above.

[0031] This application also provides a computer storage medium storing executable instructions for inducing the processor to execute steps in any of the methods described above.

[0032] The gear selection method provided in this application calculates and selects the gear corresponding to the lowest first ratio of fuel consumption as the target gear for the corresponding driving condition, and corrects the corresponding gear according to the preset order of the target gears of two adjacent driving conditions, so as to save fuel consumption while meeting the actual shifting requirements, thus reflecting the optimal economic mode. Attached Figure Description

[0033] Figure 1 A flowchart illustrating a target gear decision method for a hybrid drive system provided in this application embodiment;

[0034] Figure 2 A schematic flowchart illustrating a target gear decision method for a hybrid drive system according to an embodiment of this application;

[0035] Figure 3 The hybrid drive system provided in this application provides a gear that is determined in real time based on driving conditions and a minimum first specific fuel consumption;

[0036] Figure 4 for Figure 3 The gear corresponds to a vehicle speed range of 20-40 km / h and a wheel torque requirement of 400-600 Nm.

[0037] Figure 5 The target gear of a hybrid drive system provided in this application is adjusted according to sequential shifting characteristics. Detailed Implementation

[0038] It should be noted that the embodiments and technical features in the present application can be combined with each other without conflict, and the detailed description in the specific implementation should be understood as an explanation of the purpose of the present application, and should not be regarded as an improper limitation on the present application.

[0039] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The term "first / second" involved in the embodiments of the present application is merely to distinguish similar objects, and does not represent a specific order for the objects. Understandably, "first / second" can be interchanged in a specific order or sequence as allowed, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In the description of the embodiments of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0040] In the related art, the hybrid transmission of some vehicles needs to shift gears in a preset order, and cannot realize skip shifting during the shifting process. For example, due to structural limitations, the hybrid transmission cannot realize skip shifting during the shifting process, and needs to upshift or downshift in a preset order. The related art does not consider the influence of the shifting order on gear position decision.

[0041] The embodiments of the present application provide a hybrid power system, which has a plurality of gear positions and upshifts or downshifts in a preset order.

[0042] In an embodiment, the hybrid power system switches gear positions through a single shifting hub mechanism. Thus, since the single shifting hub can only drive one of the plurality of synchronizers to act at the same time, the single shifting hub needs to upshift or downshift in a preset order.

[0043] It can be understood that sequential shifting is not limited to the single shifting hub structure, and the existing structures in the prior art can also realize sequential shifting.

[0044] The embodiments of the present application provide a gear position decision method, please refer to Figure 1 , which comprises:

[0045] S1: obtaining a plurality of driving conditions;

[0046] S2: determining a first specific fuel consumption corresponding to all gear positions in each driving condition;

[0047] S3: selecting the gear position corresponding to the smallest first specific fuel consumption among all first specific fuel consumptions in the same driving condition as the target gear position of the corresponding driving condition;

[0048] S4: when the switching order of the target gear positions of two adjacent driving conditions does not conform to the preset order, adjusting the target gear positions so that the switching order of the target gear positions of the two adjacent driving conditions conforms to the preset order.

[0049] It should be noted that the specific fuel consumption is the fuel consumption rate, specifically, the mass of fuel consumed per hour at the engine 1 kw (kilowatt) effective power, the lower the specific fuel consumption, the better the economy.

[0050] In an embodiment, the unit of the mass of fuel can be g (grams) or Kg (kilograms).

[0051] The gear decision method provided in the embodiments of the present application selects the gear corresponding to the minimum first specific fuel consumption as the target gear of the corresponding driving condition by calculation, and corrects the corresponding gear according to the preset sequence of the target gears of the actual adjacent two driving conditions, so that the fuel consumption is saved under the premise of meeting the actual gear shifting demand, and the economy optimization mode is embodied.

[0052] It should be noted that the mode of gear shifting of the hybrid power system can only adopt the sequential gear shifting mode. The gear shifting mechanism used is not limited, in some embodiments, a single gear shifting hub mechanism is adopted, one synchronizer in the plurality of synchronizers is driven by the single gear shifting hub mechanism at the same time to realize sequential gear shifting. In other embodiments, the hybrid power system adopts a clutch to realize sequential gear shifting.

[0053] In an embodiment, it includes a series mode, an engine direct drive mode and an E-CVT (continuously variable transmission) mode. The series mode includes a series gear. The engine direct drive mode includes an engine drive one gear, an engine drive two gear, an engine drive three gear and an engine drive four gear. The E-CVT (continuously variable transmission) mode includes a continuously variable low-speed gear and a continuously variable high-speed gear.

[0054] In an embodiment, the preset sequence of gear switching is: Among them, the symbol means that The two adjacent gears at both ends can be switched, and the interval between the two gears is more than two symbols It is indicated that the two gears are not adjacent gears, and direct switching between the two gears does not conform to the preset sequence, and the two gears cannot be directly switched.

[0055] In an embodiment, the engine drive one gear can be sequentially shifted to the engine drive three gear through the continuously variable low-speed gear, the engine drive two gear, the continuously variable low-speed gear, the electric motor drive gear and the continuously variable high-speed gear.

[0056] In an embodiment, the engine drive three gear can be sequentially shifted to the engine drive one gear through the continuously variable high-speed gear, the electric motor drive gear, the continuously variable low-speed gear, the engine drive two gear and the continuously variable low-speed gear.

[0057] In one embodiment, the engine drive one gear can be sequentially upshifted to the continuously variable low speed gear and sequentially downshifted to the engine drive one gear.

[0058] It should be noted that in the motor drive gear, the vehicle is driven by pure electricity, the engine is not working, and the vehicle power is provided by the motor.

[0059] The steps of the gear decision method of the application will be described in detail below in combination with specific embodiments.

[0060] Exemplarily, the driving condition includes wheel end power and vehicle speed.

[0061] It should be noted that the wheel end power refers to the power of the tire acting on the ground.

[0062] In this embodiment, the gear decision method takes the driving condition as the input condition to obtain the specific fuel consumption corresponding thereto.

[0063] Exemplarily, please refer to Figure 2 The first specific fuel consumption is the specific fuel consumption of the wheel end, and the first specific fuel consumption corresponding to all gears is determined under each driving condition, including:

[0064] In the series gear, when the state of charge remains unchanged, the engine effective power is obtained according to the wheel end power, the first motor drive efficiency, the second motor generation efficiency and the transmission efficiency.

[0065] It should be noted that the first motor drive efficiency, the second motor generation efficiency and the transmission efficiency are obtained from the corresponding data in the bench test.

[0066]

[0067] p 轮端 : wheel end power;

[0068] η p1 : second motor generation efficiency;

[0069] η p3 : first motor drive efficiency;

[0070] η T串 : transmission efficiency;

[0071] p ICE : engine effective power;

[0072] According to the engine effective power and the engine characteristic curve, the second specific fuel consumption is determined, and the second specific fuel consumption is the minimum specific fuel consumption corresponding to the engine effective power.

[0073] The specific fuel consumption range can be determined according to the vehicle speed and the torque on the engine universal characteristic curve, and the equal power curve on the universal characteristic curve diagram will form multiple intersection points with the specific fuel consumption range, and the multiple intersection points constitute the specific fuel consumptions of the engine under the effective power, wherein the minimum specific fuel consumption corresponds to the second specific fuel consumption.

[0074] According to the second specific fuel consumption, the first motor driving efficiency, the second motor generating efficiency, and the transmission efficiency, the first specific fuel consumption under the series gear is obtained.

[0075]

[0076] b e第二 : second specific fuel consumption;

[0077] η p1 : first motor driving efficiency;

[0078] η p3 : second motor generating efficiency;

[0079] η T串 : transmission efficiency;

[0080] b e串联 : first specific fuel consumption under the series gear;

[0081] Exemplarily, referring to Figure 2 , the first specific fuel consumption is the specific fuel consumption at the wheel end, and in each driving condition, the first specific fuel consumptions corresponding to all gears are determined, including:

[0082] In each gear of the engine direct drive mode, the engine speed is obtained according to the vehicle speed;

[0083] It should be noted that, since in the engine direct drive mode, the engine is directly coupled with the wheel end, the engine speed can be determined according to the proportional relationship between the engine speed and the vehicle speed.

[0084] In each gear of the engine direct drive mode, the engine torque is determined according to the wheel end power and the engine speed;

[0085] It should be noted that the effective power of the engine is obtained according to the wheel end power and the transmission efficiency.

[0086] Then, the engine torque is determined according to the effective power of the engine and the engine speed.

[0087]

[0088] p ICE : engine effective power;

[0089] n ICE: engine speed;

[0090] T ICE : engine torque;

[0091] In each gear of the engine direct drive mode, a third specific fuel consumption is obtained according to the engine universal characteristic curve, the engine speed and the engine torque, the third specific fuel consumption being the specific fuel consumption of the engine in the corresponding gear;

[0092] According to the third specific fuel consumption and the corresponding transmission efficiency, a first specific fuel consumption in each gear of the engine direct drive mode is obtained.

[0093] It should be noted that, since the transmission efficiencies corresponding to different gears are different, the first specific fuel consumption of the engine direct drive in different gears can be obtained correspondingly.

[0094]

[0095] b e第三 : third specific fuel consumption of the engine driving first gear;

[0096] η T1st : transmission efficiency of the engine driving first gear;

[0097] b e1st : first specific fuel consumption of the engine driving first gear.

[0098] Similarly, the first specific fuel consumption b e2nd of the engine driving second gear, the first specific fuel consumption b e3rd of the engine driving third gear and the first specific fuel consumption b e4th of the engine driving fourth gear are obtained.

[0099] It should be noted that, in the preset sequence of gear switching, a motor driving gear is arranged between the continuously variable low speed gear and the continuously variable high speed gear, when the vehicle is in the motor driving gear, the vehicle is driven by the motor and the engine has no power output, at this time the engine does not generate specific fuel consumption.

[0100] In an embodiment, please refer to Figure 2 , in the E-CVT mode, the engine torque and the engine speed are determined according to the wheel end power and the vehicle speed. The specific fuel consumption b′ e of the engine is obtained according to the engine universal characteristic curve, the engine speed and the engine torque.

[0101] It's important to note that in E-CVT mode, the vehicle isn't always in either the low-speed or high-speed CVT gear. For example, in E-CVT mode, the vehicle switches between the low-speed CVT gear and the electric motor drive mode. While maintaining a constant SOC (State of Charge), the vehicle operates in both modes for a period of time. The combined fuel consumption under both modes is taken as the first specific fuel consumption under the low-speed CVT gear. Similarly, in E-CVT mode, the vehicle switches between the high-speed CVT gear and the electric motor drive mode. While maintaining a constant SOC, the vehicle operates in both modes for a period of time. The combined fuel consumption under both modes is taken as the first specific fuel consumption under the high-speed CVT gear.

[0102] In E-CVT mode, the engine torque and speed, the torque and speed of the first motor, and the torque and speed of the second motor are determined based on the wheel-end power and vehicle speed. The power p3 of the first motor is obtained from its torque and speed, and the power p1 of the second motor is obtained from its torque and speed. The sum of the power p3 and the power p1 of the second motor is the battery charging / discharging power Δp. See Table 1 for a detailed calculation example.

[0103] Table 1

[0104]

[0105] The required power of the first motor is obtained by using the power at the wheel end and the power transmitted by the first motor.

[0106]

[0107] p 轮端 Wheel-end power;

[0108] △p: Battery charging and discharging power;

[0109] p p3 : First motor drive power;

[0110] Using the balance of SOC (State of Charge) as the boundary condition, the power consumption ratio of the E-CVT during driving is obtained based on the battery charging and discharging power and the first motor drive power.

[0111]

[0112] p p3 : First motor drive power;

[0113] η p3 : first motor drive efficiency;

[0114] △t: E-CVT running power consumption ratio;

[0115] The electricity saving fuel consumption is obtained according to the engine power, the specific fuel consumption of the engine and the E-CVT running power consumption ratio.

[0116] F EV = -p ICE × b' e × (1 -△t)

[0117] p ICE : engine effective power;

[0118] b' e : specific fuel consumption of the engine;

[0119] △t: E-CVT running power consumption ratio;

[0120] F EV : electricity saving fuel consumption;

[0121] The electricity after fuel consumption is obtained according to the engine fuel consumption and the sum of the electricity saving fuel consumption.

[0122] F ecvt1 = F ICE + F EV

[0123] F ICE : engine effective power;

[0124] F EV : electricity saving fuel consumption;

[0125] F ecvt1 : electricity after fuel consumption;

[0126] The converted specific fuel consumption is obtained according to the electricity after fuel consumption and the wheel end power.

[0127]

[0128] F ecvt1 : electricity after fuel consumption;

[0129] p 轮端 : wheel end power;

[0130] b ecvt1 : converted specific fuel consumption of the continuously variable low speed gear, that is, the first specific fuel consumption of the continuously variable low speed gear;

[0131] The specific calculation example is shown in Table 2.

[0132] Table 2

[0133]

[0134] Similarly, the specific fuel consumption b of the continuously variable high-speed gear can be obtained ecvt2 , that is, the first specific fuel consumption of the continuously variable high-speed gear.

[0135] In an embodiment, in the E-CVT mode, according to the wheel end power and the vehicle speed, the optimal working point of the hybrid powertrain in the E-CVT mode is obtained through a script algorithm, and the corresponding engine speed and torque are obtained. Then the optimal specific fuel consumption of the hybrid powertrain in the optimal working point of the E-CVT mode is determined.

[0136] Exemplarily, please refer to Figure 2 In all first specific fuel consumptions under the same driving condition, the gear corresponding to the smallest first specific fuel consumption is selected as the target gear under the corresponding driving condition. That is, the first specific fuel consumptions of the series gears are compared e串联 , the first specific fuel consumption of the engine driving first gear e1st , the first specific fuel consumption of the engine driving second gear e2nd , the first specific fuel consumption of the engine driving third gear e3rd , the first specific fuel consumption of the engine driving fourth gear e4th , the specific fuel consumption b of the continuously variable low-speed gear ecvt1 , the specific fuel consumption b of the continuously variable high-speed gear ecvt2 , and the gear corresponding to the smallest first specific fuel consumption is selected as the target gear under the corresponding driving condition.

[0137] It should be noted that, please refer to Figure 3 and Figure 4 According to the vehicle speed and the wheel end power (the wheel edge required torque can be converted according to the wheel end power), the real-time gear determined according to the minimum specific fuel consumption can be obtained. Then the real-time gear is corrected according to the sequential shifting characteristics of the hybrid powertrain.

[0138] Exemplarily, the target gear is adjusted so that the switching sequence of the target gears of the adjacent two driving conditions conforms to the preset sequence, which includes: replacing the target gear so that the switching sequence of the target gears of the adjacent two driving conditions conforms to the preset sequence.

[0139] In this embodiment, based on the determination of the target gear based on economic calculation, it is ensured that the determination of the target gear conforms to the sequential shifting characteristics of the hybrid powertrain.

[0140] Exemplarily, under the same driving condition, the difference between the first specific fuel consumption corresponding to the replaced target gear and the first specific fuel consumption corresponding to the replaced target gear is not greater than 3% of the first specific fuel consumption corresponding to the replaced target gear.

[0141] For example, the target gears determined according to the lowest first specific fuel consumption are engine drive one and engine drive two, but there is a continuously variable low-speed gear between the two gears, so the following verification is adopted

[0142]

[0143] ecvt1: continuously variable low-speed gear;

[0144] δ st : engine drive one;

[0145] If the verification is true, the engine drive one is replaced by the continuously variable low-speed gear to meet the order of the continuously variable low-speed gear and the engine drive two.

[0146] The optimized target gears are shown in the following table: Figure 5 and the corresponding schematic diagram after optimization.

[0147] Exemplarily, the driving condition corresponding to the target gear that does not meet the preset order is the first driving condition, and the target gear is adjusted to make the switching order of the target gears of the adjacent two driving conditions meet the preset order, including:

[0148] At least one driving condition is added between the adjacent two first driving conditions, and the added driving condition is the second driving condition;

[0149] In each second driving condition, the first specific fuel consumption of all gears is determined;

[0150] For example, referring to the 2nd direct drive and the 3rd direct drive corresponding to the vehicle speeds of 30 and 40 and the wheel edge demand torque of 350 in the following table: Figure 3 at this time, the area between the vehicle speeds of 30 and 40 needs to be finely divided into several parts to determine the corresponding gear in each part to meet the order of gear shifting characteristics.

[0151] Among all the first specific fuel consumptions in the same second driving condition, the gear corresponding to the smallest first specific fuel consumption is selected as the target gear of the corresponding second driving condition to make the switching order of the target gears of the adjacent two driving conditions meet the preset order.

[0152] The optimized target gears are shown in the following table: Figure 5 and the corresponding schematic diagram after optimization.

[0153] The second aspect of the embodiment of the application provides a power assembly, including an acquisition module, a determination module, a selection module and an adjustment module.

[0154] The acquisition module is used to acquire a plurality of driving conditions;

[0155] The determining module is configured to determine the first specific fuel consumption corresponding to all gears in each driving condition;

[0156] The selecting module is configured to select the gear corresponding to the minimum first specific fuel consumption among all first specific fuel consumptions in the same driving condition as the target gear of the driving condition.

[0157] The adjusting module is configured to adjust the target gear so that the switching sequence of the target gears of the adjacent two driving conditions conforms to the preset sequence when the switching sequence of the target gears of the adjacent two driving conditions does not conform to the preset sequence.

[0158] Exemplarily, the power assembly further comprises a memory and a processor, the memory stores executable instructions executable on the processor, and the processor implements the steps in any one of the above methods when executing the program.

[0159] A third aspect of the embodiments of the present application provides a computer storage medium storing executable instructions for causing a processor to execute the steps in any one of the above methods.

[0160] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application is included in the protection scope of the present application.

Claims

1. A gear selection decision method, characterized in that, The gear shifting has a preset order, and the gear decision method includes: Multiple driving conditions are acquired, wherein the driving conditions are those corresponding to wheel-end power and vehicle speed; Under each driving condition, determine the first ratio of fuel consumption for each gear; Among all the first ratio fuel consumptions under the same driving conditions, the gear corresponding to the smallest first ratio fuel consumption is selected as the target gear for the corresponding driving conditions, so as to obtain the target gears corresponding to different vehicle speeds and different wheel end power. If the switching order of the target gears in two adjacent driving conditions does not conform to the preset order, the target gears are adjusted so that the switching order of the target gears in two adjacent driving conditions conforms to the preset order; wherein, two adjacent driving conditions refer to the corresponding vehicle speed and / or wheel-end power being adjacent. The driving condition corresponding to a target gear whose switching order does not conform to the preset order is the first driving condition. Adjusting the target gear so that the switching order of the target gears in two adjacent driving conditions conforms to the preset order includes: At least one new driving condition is added between two adjacent first driving conditions, and the added driving condition is the second driving condition; Under each second driving condition, determine the first ratio of fuel consumption for all gears; Among all the first ratio fuel consumptions under the same second driving condition, the gear corresponding to the smallest first ratio fuel consumption is selected as the target gear for the corresponding second driving condition, so that the switching order of the target gears of two adjacent driving conditions conforms to the preset order.

2. The gear selection method according to claim 1, characterized in that, Adjusting the target gear to make the switching order of the target gears in two adjacent driving conditions conform to a preset order includes: changing the target gear to make the switching order of the target gears in two adjacent driving conditions conform to a preset order.

3. The gear selection method according to claim 2, characterized in that, Under the same driving conditions, the ratio of the difference between the first ratio of fuel consumption corresponding to the target gear after the change and the first ratio of fuel consumption corresponding to the target gear before the change to the first ratio of fuel consumption corresponding to the target gear after the change is no greater than 3%.

4. The gear selection method according to claim 1, characterized in that, The first specific fuel consumption is the specific fuel consumption at the wheel end. Under each driving condition, the first specific fuel consumption corresponding to all gears is determined, including: In series gear mode, when the state of charge remains unchanged, the effective power of the engine is obtained based on the wheel end power, the driving efficiency of the first motor, the power generation efficiency of the second motor, and the transmission efficiency of the gearbox. The second specific fuel consumption is determined based on the engine's effective power and the engine's universal characteristic curve. The second specific fuel consumption is the minimum specific fuel consumption under the corresponding engine's effective power. The first specific fuel consumption under the series gear position is obtained based on the second specific fuel consumption, the first motor drive efficiency, the second motor power generation efficiency, and the gearbox transmission efficiency.

5. The starting control method according to claim 1, characterized in that, The first specific fuel consumption is the specific fuel consumption at the wheel end. Under each driving condition, the first specific fuel consumption corresponding to all gears is determined, including: In each gear of the engine direct drive mode, the engine speed is obtained based on the vehicle speed; In each gear of the engine direct drive mode, the engine torque is determined based on the wheel end power and the engine speed; In each gear of the engine direct drive mode, a third specific fuel consumption is obtained based on the engine universal characteristic curve, the engine speed, and the engine torque. The third specific fuel consumption is the specific fuel consumption of the engine in the corresponding gear. Based on the third ratio fuel consumption and the transmission efficiency of the corresponding gearbox, the first ratio fuel consumption of each gear in the engine direct drive mode is obtained.

6. A powertrain for implementing the gear selection method as described in claim 1, characterized in that, include: The acquisition module is used to acquire multiple driving conditions; The determination module is used to determine the first specific fuel consumption for all gears under each driving condition; The selection module is used to select the gear with the smallest first ratio fuel consumption among all first ratio fuel consumptions under the same driving conditions as the target gear for the corresponding driving conditions. The adjustment module is used to adjust the target gears so that the switching order of the target gears in two adjacent driving conditions conforms to the preset order when the switching order of the target gears in two adjacent driving conditions does not match the preset order.

7. A powertrain, characterized in that, The method includes a memory and a processor, the memory storing executable instructions that can run on the processor, the processor executing the program to implement the steps of the method according to any one of claims 1 to 5.

8. A computer storage medium, characterized in that, The device stores executable instructions for causing the processor to execute, thereby implementing the steps of the method according to any one of claims 1 to 5.

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