A vehicle control method, a vehicle control unit, and a hybrid power system

Abstract

The application discloses a vehicle control method, a whole vehicle controller and a hybrid power system, and relates to the whole vehicle control technical field of a hybrid electric vehicle. The vehicle control method comprises the following steps: determining an external characteristic power upper limit value corresponding to an engine target rotating speed according to the engine target rotating speed and an engine external characteristic curve; when the external characteristic power upper limit value is smaller than a current vehicle total demand power, and a current vehicle speed is greater than a first preset vehicle speed, activating a clutch lock, and determining that a current vehicle hybrid configuration is a parallel P2 configuration; when the current vehicle total demand power is greater than a sum of a maximum power under the current vehicle speed and a preset power floating value, or the current vehicle speed is smaller than a first preset reference vehicle speed, releasing the clutch lock, and determining that the current vehicle hybrid configuration is a series-parallel PS configuration. The technical scheme of the embodiment of the application can adjust the vehicle to an optimal working mode in real time, and effectively improves the transmission efficiency of the whole vehicle.

Description

Technical Field

[0001] This invention relates to the field of hybrid electric vehicle control technology, and more particularly to a vehicle control method, a vehicle controller, and a hybrid power system. Background Technology

[0002] Hybrid power generally refers to hybrid power, which is a combination of fuel and electricity. Hybrid vehicles are driven by an electric motor as an auxiliary power source to the engine.

[0003] Currently, because hybrid vehicles have multiple operating modes, when switching modes, it is necessary to coordinate the state changes of the engine, generator, and drive motor. It is often impossible to accurately determine the required switching mode in real time, which affects the transmission efficiency of the entire vehicle. Summary of the Invention

[0004] This invention provides a vehicle control method, a vehicle controller, and a hybrid power system to solve the problem that existing hybrid vehicles cannot adjust the vehicle to the optimal operating mode in real time during vehicle control.

[0005] According to one aspect of the present invention, a vehicle control method is provided, comprising: Based on the current vehicle throttle opening and current vehicle speed, interpolate the MAP table to calculate the current total power demand of the vehicle. When the current vehicle speed is greater than the first preset vehicle speed, the target engine speed in the sun gear lock mode is calculated based on the planetary gear set characteristic value, the output shaft speed of the second gear AMT, and the transmission ratio of the second gear AMT. Based on the engine target speed and engine external characteristic curve in the sun gear lock-up mode, determine the upper limit of the external characteristic power corresponding to the engine target speed in the sun gear lock-up mode; If the upper limit of the external characteristic power is less than the current total power demand of the vehicle, and the current vehicle speed is greater than the first preset vehicle speed, then the clutch lock is activated, and the current vehicle hybrid configuration is determined to be a parallel P2 configuration. If the total power demand of the current vehicle is greater than the sum of the maximum power at the current vehicle speed and the preset power fluctuation value, or if the current vehicle speed is less than the first preset reference speed, then the clutch lock is released, and the current vehicle hybrid configuration is determined to be a series-parallel PS configuration.

[0006] According to another aspect of the present invention, a vehicle controller is provided, the vehicle controller comprising: At least one processor; and a memory communicatively connected to said at least one processor; The memory stores a computer program that can be executed by the at least one processor, which is then executed by the at least one processor to enable the at least one processor to perform the vehicle control method according to any embodiment of the present invention.

[0007] According to another aspect of the present invention, a hybrid power system is provided, including a vehicle controller, a single planetary gear set, a two-speed AMT, a generator, an engine, a drive motor, and a lock-up clutch; The vehicle controller controls the generator, engine, drive motor, and lock-up clutch. The engine is connected to the planetary carrier of a single planetary gear set. The torque of the ring gear of the single planetary gear set is coupled with the torque of the drive motor and then transmitted to the two-speed AMT.

[0008] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the vehicle control method according to any embodiment of the present invention.

[0009] According to another aspect of the present invention, a computer program product is provided, the computer program product comprising a computer program that, when executed by a processor, implements the vehicle control method according to any embodiment of the present invention.

[0010] The technical solution of this invention calculates the total power demand of the vehicle by interpolating a preset MAP table based on the current vehicle throttle opening and current vehicle speed. When the current vehicle speed is greater than a first preset vehicle speed, the target engine speed in the sun gear lock-up mode is calculated based on the planetary gear set characteristic value, the output shaft speed of the second-gear AMT, and the transmission ratio of the second-gear AMT. Based on the target engine speed in the sun gear lock-up mode and the engine external characteristic curve, the upper limit of the external characteristic power corresponding to the target engine speed in the sun gear lock-up mode is determined. When the upper limit of the external characteristic power is less than the total power demand of the vehicle and the current vehicle speed is greater than the first preset vehicle speed, the clutch lock-up is activated, and the current vehicle hybrid configuration is determined to be a parallel P2 configuration. When the total power demand of the vehicle is greater than the sum of the maximum power at the current vehicle speed and the preset power fluctuation value, or when the current vehicle speed is less than the first preset reference vehicle speed, the clutch lock-up is released, and the current vehicle hybrid configuration is determined to be a series-parallel PS configuration. This solution supports switching between a hybrid PS configuration and a parallel P2 configuration. In low-speed conditions, the hybrid PS configuration is used, allowing the engine to operate according to a preset optimal operating curve based on PS power split control, thus improving engine thermal efficiency. In high-speed conditions, the parallel P2 configuration is used, enabling direct engine drive and reducing efficiency losses due to power split. When the driver's power demand exceeds the engine's maximum external characteristic power in the locked state, the sun gear lock is released, allowing the engine to output full power and improving overall vehicle performance. This solves the problem of existing hybrid vehicles being unable to adjust the vehicle to the optimal operating mode in real time, effectively improving the overall vehicle transmission efficiency.

[0011] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a flowchart of a vehicle control method provided in Embodiment 1 of the present invention; Figure 2 A schematic diagram of the structure of a vehicle controller that can be used to implement an embodiment of the present invention is shown; Figure 3 This is a schematic diagram of a coaxial series configuration of a hybrid power system; Figure 4 This is a schematic diagram of the parallel configuration of a hybrid power system. Detailed Implementation

[0014] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0015] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0016] Example 1 Figure 1This is a flowchart of a vehicle control method provided in Embodiment 1 of the present invention. This embodiment is applicable to situations requiring real-time and precise adjustment of vehicle operating modes. The method can be executed by a vehicle control device, which can be implemented in hardware and / or software and can be configured within the vehicle controller. The vehicle control device is a virtual device that executes the vehicle control method. Figure 1 As shown, the method includes: Step 110: Based on the current vehicle throttle opening and current vehicle speed, interpolate the preset MAP table to calculate the current total power demand of the vehicle.

[0017] The preset MAP table can be a pre-configured vehicle power demand spectrum lookup table. The current total vehicle power demand can be the total power demand of the vehicle under the current operating conditions.

[0018] In this embodiment of the invention, the total power demand of the current vehicle can be calculated by interpolation from a preset MAP table based on the current throttle opening and the current vehicle speed.

[0019] Step 120: When the current vehicle speed is greater than the first preset vehicle speed, calculate the target engine speed in the sun gear lock-up mode based on the planetary gear set characteristic value, the second-gear AMT output shaft speed, and the second-gear AMT transmission ratio.

[0020] The first preset vehicle speed can be the sum of the vehicle speed obtained from the simulation of the final drive ratio and the anti-shake vehicle speed. The planetary gear set characteristic value can be an inherent structural parameter of a single-row planetary gear mechanism, representing the ratio of the number of teeth on the ring gear to the number of teeth on the sun gear. The second-gear AMT output shaft speed can be the rotational speed of the second-gear AMT output shaft. The second-gear AMT transmission ratio can be the ratio of the driving gear speed to the driven gear speed. The engine target speed can be the desired engine speed.

[0021] In this embodiment of the invention, the current vehicle speed can be compared with the first preset vehicle speed. If the current vehicle speed is greater than the first preset vehicle speed, the planetary gear set characteristic value, the second-gear AMT output shaft speed and the second-gear AMT transmission ratio are multiplied together and divided by 1 and the sum of the planetary gear set characteristic value to obtain the engine target speed in the sun gear lock-up mode.

[0022] Step 130: Based on the engine target speed and engine external characteristic curve under the sun gear lock-up mode, determine the upper limit of the external characteristic power corresponding to the engine target speed under the sun gear lock-up mode.

[0023] The upper limit of the external characteristic power can be the maximum power calculated along the engine's external characteristic speed range.

[0024] In this embodiment of the invention, the maximum external characteristic power corresponding to the engine target speed in the sun gear lock-up mode can be obtained by interpolating the engine external characteristic curve from the engine target speed in the sun gear lock-up mode, i.e., the upper limit of the external characteristic power.

[0025] Step 140: If the upper limit of the external characteristic power is less than the current total power demand of the vehicle, and the current vehicle speed is greater than the first preset vehicle speed, then the clutch lock is activated, and the current vehicle hybrid configuration is determined to be a parallel P2 configuration.

[0026] Among them, the parallel P2 configuration can be a configuration in which the clutch is hard-connected and the speed is bound.

[0027] In this embodiment of the invention, if the upper limit of the external characteristic power is less than the current total power demand of the vehicle and the current vehicle speed is greater than the first preset vehicle speed, the clutch lock is activated, thereby changing the current vehicle hybrid configuration into a parallel P2 configuration.

[0028] Step 150: If the total power demand of the current vehicle is greater than the sum of the maximum power at the current vehicle speed and the preset power fluctuation value, or if the current vehicle speed is less than the first preset reference speed, then the clutch lock is released, and the current vehicle hybrid configuration is determined to be a series-parallel PS configuration.

[0029] The preset power fluctuation value can be a pre-set power fluctuation value. The first preset reference vehicle speed can be the vehicle speed obtained from the simulation of the final drive ratio. The hybrid PS configuration can be a configuration with planetary gear set flexible splitting, speed decoupling, and a single reducer as the main component. The hybrid PS configuration is used for power splitting of the engine.

[0030] In this embodiment of the invention, the sum of the maximum power at the current vehicle speed and the preset power fluctuation value can be calculated. When the total power demand of the current vehicle is greater than the sum of the maximum power at the current vehicle speed and the preset power fluctuation value, or when the current vehicle speed is less than the first preset reference vehicle speed, the clutch lock is released and the current vehicle hybrid configuration is adjusted to a parallel-parallel PS configuration to achieve full power output and improve power.

[0031] In an optional embodiment of the present invention, after determining that the current vehicle hybrid configuration is a series-parallel (PS) configuration, the method may further include: calculating the engine target speed and engine target torque in the decoupled speed regulation mode based on the current total power demand of the vehicle and the engine preset economic curve; calculating the sun gear speed in the decoupled speed regulation mode based on the engine target speed, planetary gear set characteristic value, second-gear AMT output shaft speed, and second-gear AMT transmission ratio; setting the engine to the decoupled speed regulation mode when the sun gear speed in the decoupled speed regulation mode is greater than the first preset sun gear speed; and setting the engine to the soft coupling speed regulation mode when the sun gear speed in the decoupled speed regulation mode is less than the first preset sun gear reference speed.

[0032] The engine preset economic curve can be the engine's optimal economic curve. The first preset sun gear speed can be the sum of the first preset sun gear reference speed and the speed fluctuation value corresponding to the first preset sun gear reference speed. The first preset sun gear reference speed can be a very small positive number. The engine target torque can be the torque corresponding to the engine target speed. The decoupled speed control mode can be a speed control mode in which the three control quantities of excitation, torque, and speed do not interfere with each other, and the speed and torque are adjusted independently and precisely. The soft-coupled speed control mode can be a speed control mode based on light coupling and utilizing a flexible structure to buffer interference.

[0033] In this embodiment of the invention, the target engine speed and target engine torque in the decoupled speed regulation mode can be calculated according to the data processing logic in the vehicle controller based on the current total power demand of the vehicle and the engine's preset economic curve. Then, the planetary gear set characteristic value is summed with 1, multiplied by the target engine speed in the decoupled speed regulation mode, and subtracted from the product of the planetary gear set characteristic value, the second-gear AMT output shaft speed, and the second-gear AMT transmission ratio to obtain the sun gear speed in the decoupled mode. When the sun gear speed in the decoupled mode is greater than the first preset sun gear speed, the engine is set to the decoupled speed regulation mode; when the sun gear speed in the decoupled mode is less than the first preset sun gear reference speed, the engine is set to the soft-coupled speed regulation mode.

[0034] In an optional embodiment of the present invention, when the sun gear speed in the decoupling mode is greater than the first preset sun gear speed, after setting the engine to the decoupling speed regulation mode, the method may further include: when the sun gear speed in the decoupling mode is greater than the first preset sun gear speed, calculating the first speed regulation torque of the sun gear generator based on the engine target torque, planetary gear set characteristic value, the difference between the engine target speed and the actual engine speed in the decoupling speed regulation mode, and the proportional-integral coefficient; and adjusting the engine speed based on the first speed regulation torque of the sun gear generator.

[0035] The first speed-regulating torque of the solar generator can be the expected torque of the solar generator calculated when the current vehicle hybrid configuration is a series-parallel PS configuration and the engine is in decoupled speed regulation mode.

[0036] In this embodiment of the invention, the sun gear speed in the decoupling mode can be compared with the first preset sun gear speed. If the sun gear speed in the decoupling mode is greater than the first preset sun gear speed, the difference between the engine target speed and the engine actual speed in the decoupling speed regulation mode is multiplied by the proportional-integral coefficient. Based on the product value, the engine target torque, and the planetary gear set characteristic value, the first speed regulation torque of the sun gear generator is calculated, thereby adjusting the engine speed based on the first speed regulation torque of the sun gear generator.

[0037] In an optional embodiment of the present invention, when the sun gear speed in decoupling mode is less than a preset sun gear reference speed, after setting the engine to soft coupling speed regulation mode, the method may further include: discretizing the engine's economic speed range according to a preset number of segments to obtain a speed segment step size; calculating a first target value of the engine speed in the sun gear power generation state according to the speed segment step size, the target speed of the sun gear power generation state, the planetary gear set characteristic value, and the second-gear AMT transmission ratio; calculating a second target value of the engine speed in the sun gear drive state according to the target speed of the sun gear drive state, the planetary gear set characteristic value, the second-gear AMT transmission ratio, the speed segment step size, and the second-gear AMT output shaft speed; determining the engine reconfiguration speed based on the first target value of the engine speed, the second target value of the engine speed, and the engine's economic speed range; calculating a second speed regulation torque of the sun gear generator according to the engine reconfiguration speed, the planetary gear set characteristic value, the difference between the engine reconfiguration speed and the actual engine speed in soft coupling speed regulation mode, and the proportional-integral coefficient; and performing engine speed regulation based on the second speed regulation torque of the sun gear generator.

[0038] The preset number of interval segments can be a pre-set number of segments for the engine's economic speed range. The engine's economic speed range can be a speed range defined by the engine's upper and lower speed limits. The speed segment step size can be the sub-interval step size after dividing the engine's economic speed range according to the number of speed segments. The target speed for the solar turbine in power generation mode can be a pre-set speed for the solar turbine in power generation mode under soft coupling speed regulation. The target speed for the solar turbine in drive mode can be a pre-set speed for the solar turbine in drive mode under soft coupling speed regulation. The first target value of engine speed can be the discretized target value of the generator speed in solar turbine power generation mode. The second target value of engine speed can be the discretized target value of the generator speed in solar turbine drive mode. The engine reconfigured speed can be the reconstructed engine speed based on the first target value of engine speed, the second target value of engine speed, and the upper limit of the engine's economic speed range. The second speed regulation torque of the solar turbine generator is the expected torque of the solar turbine generator calculated when the current vehicle hybrid configuration is a series-parallel PS configuration and the engine is in soft coupling speed regulation mode.

[0039] In this embodiment of the invention, the speed difference within the engine's economic speed range can be divided by a preset number of interval segments to obtain the speed segment step size. Then, the second-gear AMT output shaft speed, planetary gear set characteristic value, and second-gear AMT transmission ratio are multiplied and summed with the target speed in the sun gear power generation state. Based on this summation, the planetary gear set characteristic value, and the speed segment step size, a first target value for the engine speed in the sun gear power generation state is calculated. Then, the product of the second-gear AMT output shaft speed, planetary gear set characteristic value, and second-gear AMT transmission ratio is summed with the target speed in the sun gear drive state. Based on this summation, the planetary gear set characteristic value, and the speed segment step size, a second target value for the engine speed in the sun gear drive state is obtained. When the first target engine speed is less than the upper limit of the engine's economic speed range, this first target engine speed is used as the engine reconfiguration speed. When the first target engine speed is greater than the upper limit of the engine's economic speed range, and the second target engine speed is less than or equal to the upper limit of the engine's economic speed range, this second target engine speed is used as the engine reconfiguration speed. When the second target engine speed is greater than the upper limit of the engine's economic speed range, this upper limit is used as the engine reconfiguration speed. Further, based on the engine reconfiguration speed and the current total power demand of the vehicle, the engine reconfiguration torque corresponding to the engine reconfiguration speed is calculated. Then, based on the engine reconfiguration torque, planetary gear set characteristic values, the difference between the engine reconfiguration speed and the actual engine speed in soft-coupled speed control mode, and the proportional-integral coefficient, the second speed control torque of the sun gear generator is calculated. Finally, the engine speed is adjusted according to the second speed control torque of the sun gear generator.

[0040] In an optional embodiment of the present invention, calculating the first target value of the engine speed under the sun gear power generation state based on the speed segment step size, the target speed under the sun gear power generation state, the planetary gear set characteristic value, and the second-gear AMT transmission ratio may include: calculating the first target value of the engine speed under the sun gear power generation state based on the following formula: ;in, The target rotational speed of the solar gear during power generation is represented by k, where k represents the characteristic value of the planetary gear set. This indicates the gear ratio of the second-gear AMT. Indicates the step size of the rotational speed segments. This represents the floor function; This indicates the first target value for engine speed. This indicates the output shaft speed of the second-gear AMT.

[0041] In an optional embodiment of the present invention, calculating the second target value of the engine speed in the sun gear drive state based on the target speed in the sun gear drive state, the planetary gear set characteristic value, the second-gear AMT transmission ratio, the speed segment step size, and the second-gear AMT output shaft speed may include: calculating the second target value of the engine speed in the sun gear drive state based on the following formula: ; in, This indicates the target rotational speed in the sun gear drive state. This represents the second target value of engine speed under sun gear drive conditions.

[0042] In an optional embodiment of the present invention, determining the engine reconfiguration speed based on a first target value of engine speed, a second target value of engine speed, and the engine's economic speed range may include: determining the engine reconfiguration speed based on the following formula: ; in, Indicates the engine reconfiguration speed. This indicates the upper limit of the engine's economic speed range.

[0043] The technical solution of this invention calculates the total power demand of the vehicle by interpolating a preset MAP table based on the current vehicle throttle opening and current vehicle speed. When the current vehicle speed is greater than a first preset vehicle speed, the target engine speed in the sun gear lock-up mode is calculated based on the planetary gear set characteristic value, the output shaft speed of the second-gear AMT, and the transmission ratio of the second-gear AMT. Based on the target engine speed in the sun gear lock-up mode and the engine external characteristic curve, the upper limit of the external characteristic power corresponding to the target engine speed in the sun gear lock-up mode is determined. When the upper limit of the external characteristic power is less than the total power demand of the vehicle and the current vehicle speed is greater than the first preset vehicle speed, the clutch lock-up is activated, and the current vehicle hybrid configuration is determined to be a parallel P2 configuration. When the total power demand of the vehicle is greater than the sum of the maximum power at the current vehicle speed and the preset power fluctuation value, or when the current vehicle speed is less than the first preset reference vehicle speed, the clutch lock-up is released, and the current vehicle hybrid configuration is determined to be a series-parallel PS configuration. This solution supports switching between a hybrid PS configuration and a parallel P2 configuration. In low-speed conditions, the hybrid PS configuration is used, allowing the engine to operate according to a preset optimal operating curve based on PS power split control, thus improving engine thermal efficiency. In high-speed conditions, the parallel P2 configuration is used, enabling direct engine drive and reducing efficiency losses due to power split. When the driver's power demand exceeds the engine's maximum external characteristic power in the locked state, the sun gear lock is released, allowing the engine to output full power and improving overall vehicle performance. This solves the problem of existing hybrid vehicles being unable to adjust the vehicle to the optimal operating mode in real time, effectively improving the overall vehicle transmission efficiency.

[0044] Example 2 Embodiment 2 of the present invention provides an optional embodiment of a vehicle control method, the specific implementation of which can be found in the following embodiments. Technical terms that are the same as or corresponding to those in the above embodiments will not be repeated here.

[0045] The vehicle control method in this embodiment includes a hybrid mode switching control strategy and an engine speed control strategy (engine decoupling speed regulation and soft coupling speed regulation control method under the hybrid PS configuration). The hybrid mode switching control strategy includes the following specific steps: 1.1) Based on the current vehicle throttle opening and current vehicle speed, interpolate the preset vehicle power demand MAP table to calculate the current total power demand of the vehicle. .

[0046] 1.2) Set the first preset reference speed The floating speed corresponding to the first preset benchmark speed When the current vehicle speed exceeds the first preset speed At that time, calculate the target engine speed in sun gear lock-up mode. : ; in, These are the eigenvalues ​​of the planetary arrangement. This is the second-speed AMT output shaft. This is the second gear AMT transmission ratio.

[0047] 1.3) By By interpolating the engine's external characteristic curve, the upper limit of the external characteristic power corresponding to the engine's target speed in sun gear lock-up mode can be obtained. ; The engine's external characteristic curves show speeds of 400, 800, 1000, 1200, 1300, 1400, 1500, 1600, 1800, 1900, 2000, 2200, 2400, 2600, 2800, and 3000 rpm, with corresponding power outputs of 5, 17, 34, 45, 48, 52, 57, 60, 68, 72, 76, 84, 93, 102, 110, 115, and 118 kW, respectively.

[0048] 1.4) Comparison and Determine if the clutch is locked. If the current vehicle speed is greater than the first preset vehicle speed, the clutch lock is activated, and the hybrid configuration changes to a parallel P2 configuration; if If the current vehicle speed is less than the first preset benchmark speed, the clutch lock is released, and the hybrid configuration changes to a series-parallel PS configuration, achieving full power output and enhancing power. This indicates the maximum power output at the current vehicle speed. This indicates the preset power fluctuation value.

[0049] This solution offers two hybrid modes: PS series-parallel hybrid mode and P2 parallel hybrid mode. In P2 parallel hybrid mode, engine speed is coupled to vehicle speed, and engine speed is entirely constrained by operating conditions, lacking speed regulation capabilities. In PS series-parallel hybrid mode, engine speed is decoupled from vehicle speed, allowing for both decoupled and soft-coupled speed regulation control of engine speed.

[0050] Engine speed control strategy includes the following key steps: 2.1) Based on the current total power demand of vehicles and engine preset economy curve The target engine speed under decoupled speed regulation mode is obtained by interpolation calculation. and engine target torque ; The optimal torque curve in the engine's preset economic curve has speeds of 850, 868, 1166, 1343, 1429, 1464, 1477, 1484, 1491, 1501, 1518, 1540, 1542, 1600, 1800, 1900, 2000, 2200, 2400, 2600, 2800, 2900, and 3000, with corresponding torques of 0, 90, 119, 147, 177, 209, 242, 275, 308, 341, 371, 399, 437, 439, 440, 442, 438, 435, 422, 406, 387, 378, and 377. The optimal power curve in the engine's preset economic curve has speeds of 850, 868, 1166, 1343, 1429, 1464, 1477, 1484, 1491, 1501, 1518, 1540, 1542, 1600, 1800, 1900, 2000, 2200, 2400, 2600, 2800, and 3000, with corresponding power outputs of 0, 8, 15, 21, 27, 32, 37, 43, 48, 54, 59, 64, 71, 74, 83, 88, 92, 100, 106, 111, 113, 115, and 118.

[0051] 2.2) Engine target speed in decoupling mode Calculate the sun gear speed in decoupling mode. : ; Where k is the eigenvalue of the planetary arrangement. This is the second-speed AMT output shaft. This is the second gear AMT transmission ratio.

[0052] 2.3) Set the first preset sun gear reference speed and the floating speed corresponding to the reference speed of the sun gear. The speed of the sun gear in decoupled mode Determine the engine speed control mode under the current operating conditions. Then the engine is set to decoupled speed control mode. Then the engine is set to soft coupling speed regulation mode.

[0053] 2.4) In decoupled speed control mode, the VCU (Vehicle Control Unit) sends CAN messages. The engine ECU (Engine Control Unit) controls the engine torque output using torque control mode. The first speed regulating torque of the sun gear generator is calculated based on the relationship between the planetary gear set torque and the torque. : ; in, To decouple the difference between the engine target speed and the actual engine speed in speed regulation mode. , This is the proportional integral coefficient.

[0054] 2.5) In soft-coupling speed control mode, set the engine's economic speed range. Target rotational speed of the solar power generation system Target speed in sun gear drive state : Based on the preset number of interval segments, the engine's economic speed range is... Discretization: ; in, The preset number of interval segments, This represents the lower limit of the engine's economic speed range. This is the upper limit of the engine's economic speed range.

[0055] based on Calculate the first target value of the engine speed under solar power generation conditions, and based on... Calculate the second target value of engine speed under sun gear drive state.

[0056] based on Calculate the engine reconfiguration speed.

[0057] Calculate the target engine speed in soft coupling mode The formula is as follows: .

[0058] Based on the current total power demand of vehicles and engine reconfiguration speed This allows for further calculation of the engine reconfiguration torque. , .

[0059] In soft-coupled speed control mode, the VCU sends the target torque via CAN message. The engine ECU uses torque control mode to control the engine torque output, and the engine speed is reconfigured. The speed regulating torque of the sun gear generator is calculated from the relationship between the planetary gear set torque and the torque. The formula is as follows: ; in, Reconstructing engine speed Compared with actual speed The difference, , This is the proportional integral coefficient.

[0060] In a specific example, suppose the current vehicle speed is Interpolate the preset vehicle power demand MAP table to calculate the current vehicle's total power demand. .

[0061] Set the first preset baseline speed , When the current vehicle speed exceeds At that time, calculate the target engine speed in sun gear lock-up mode. : ; in, These are the eigenvalues ​​of the planetary arrangement. This is the second-speed AMT output shaft. This is the gear ratio for a second-gear AMT. In the example, the rear axle ratio... Tire radius Two gear ratios of the transmission Based on the current vehicle speed, the output shaft speed of the second-gear AMT can be calculated to be 2414 rpm.

[0062] Depend on By interpolating the engine's external characteristic curve, the upper limit of the external characteristic power corresponding to the engine's target speed in sun gear lock-up mode can be obtained. .

[0063] contrast and ,because , The power output is insufficient to meet the vehicle's power requirements, therefore clutch locking is not performed; if At this point, with the sun gear locked, the engine's maximum output power can meet the vehicle's power requirements, thus enabling the clutch lock-up operation.

[0064] Depend on The target engine speed in decoupled speed control mode is obtained by interpolation calculation based on the engine's preset economic curve. and engine target torque ; Engine target speed in decoupling mode Calculate the sun gear speed in decoupling mode. : ; ; These are the eigenvalues ​​of the planetary arrangement. This is the second-speed AMT output shaft. This is the gear ratio of a second-gear AMT; in the example, the rear axle speed ratio... Tire radius Two gear ratios of the transmission According to vehicle speed The output shaft speed of the second-gear AMT can be calculated to be 2414 rpm.

[0065] Set the first preset reference speed of the sun gear. The floating speed corresponding to the reference speed of the sun gear .Depend on Determine the engine speed control mode under the current operating conditions, because Set the engine to decoupled speed control mode. Then the engine is set to soft coupling speed regulation mode.

[0066] In decoupled speed control mode, the VCU sends the target torque via CAN message. The engine ECU uses torque control mode to control the engine torque output, which is determined by the target engine speed. The speed regulating torque of the sun gear generator is calculated from the relationship between the planetary gear set torque and the torque. The formula is as follows: ; ; in, , .

[0067] In soft-coupling speed control mode, set the engine's economic speed range. Target rotational speed of the solar power generation system Target speed in sun gear drive state .

[0068] If the current total power demand of the vehicle Then the target engine speed in decoupled speed regulation mode can be calculated as follows: Sun gear speed in decoupling mode , ; The target speed has fallen below the lower limit of the decoupling speed regulation range (-200 rpm), therefore the soft coupling speed regulation mode is activated, as follows: Engine economic speed range Discretize into N=8 gears, as shown in the following formula: ; ; because Less than Therefore, the engine reconfiguration speed is set to 1900 rpm; If the current total power demand of the vehicle remains unchanged The speed continued to increase to ,but , ; ; at this time Greater than The engine speed is reconstructed as follows: Calculate the discretized target value of the engine speed under sun gear drive conditions. The formula is as follows: .

[0069] because equal Therefore, the engine reconfiguration speed is set to 2400 rpm.

[0070] If the current total power demand of vehicles remains unchanged If the speed continues to increase to 110km / h, then Calculations yielded , ; at this time Greater than the engine speed limit The engine reconfiguration speed is set to a constant value. The rotational speed range of the sun gear is no longer limited; at this point, the rotational speed of the sun gear... : ; ; Assuming the current total power demand of the vehicle The current vehicle speed is 80 km / h, and the engine speed is reconfigured. This allows for further calculation of the engine reconfiguration torque. The formula is as follows: ; In soft-coupled speed control mode, the VCU sends CAN messages. The engine ECU uses torque control mode to control the engine torque output. The speed regulating torque of the sun gear generator is calculated from the relationship between the planetary gear set torque and the torque. The formula is as follows: ; ; in, This is the difference between the current engine reconfiguration speed and the actual engine speed. This is the proportional integral coefficient.

[0071] Example 3 Figure 2 A schematic diagram of a vehicle controller that can be used to implement embodiments of the present invention is shown. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the invention described and / or claimed herein.

[0072] The hybrid system includes a vehicle controller, a single planetary gear set, a two-speed AMT, a generator, an engine, a drive motor, and a lock-up clutch. The vehicle controller controls the generator, engine, drive motor, and lock-up clutch. The engine is connected to the planet carrier of the single planetary gear set, and the torque of the ring gear of the single planetary gear set is coupled with the torque of the drive motor and then transmitted to the two-speed AMT.

[0073] The hybrid system includes a vehicle controller, engine, generator, drive motor, power battery, motor controller (generator and drive motor), planetary gear set, 2-speed AMT, sun gear lock-up clutch, driveshaft, and reducer. The engine is connected to the planetary gear set carrier, and the engine torque is transmitted to the planetary gear set ring gear via planetary gears. The planetary gear set ring gear is connected to the driveshaft. The generator is connected to the sun gear of the planetary gear set. The drive motor is connected to the driveshaft. The torque of the planetary gear set ring gear is coupled with the torque of the drive motor and transmitted to the 2-speed AMT reducer. The output of the 2-speed AMT is connected to the main reducer, and the lock-up clutch is connected to the sun gear brake end. The battery is connected to the motor controller (generator and drive motor) via a high-voltage wiring harness. The dual-motor controller controls the operation of the generator and drive motor. The vehicle controller is used to control engine speed, generator operating mode, drive motor operating mode, and clutch lock-up. For the coaxial series configuration of the hybrid system, please refer to [link to relevant documentation]. Figure 3 For the off-axis parallel configuration of the hybrid power system, see [link to relevant documentation]. Figure 4 The configuration of the hybrid system is partially connected. Figure 3 and Figure 4 As shown.

[0074] The hybrid power system consists of a single planetary gear set, a two-speed automatic transmission (AMT), and a sun gear lock-up device. The torque of the planetary gear set ring gear is coupled with the torque of the drive motor and then transmitted to the two-speed reducer, forming a hybrid + series configuration. This configuration allows for switching between PS and P2 configurations. In low-speed conditions, PS power split control is used to ensure the engine operates according to a preset optimal operating curve, improving engine thermal efficiency. In high-speed conditions, P2 parallel control is used to enable direct engine drive, reducing efficiency losses caused by power splitting. When the driver's power demand exceeds the engine's maximum external characteristic power in the lock-up state, the sun gear lock-up is released, allowing the engine to output full power and improving the vehicle's overall performance. Because this scheme uses a hybrid + series configuration for torque transmission, it greatly reduces the torque demand of the drive motor, significantly improving the overall vehicle power performance and meeting the requirements of light commercial vehicles under all operating conditions. However, since the planetary gear set is connected in series at the front of the 2nd gear AMT, the ring gear speed is higher, increasing the power cycle conditions of the planetary gear set. To address this, this invention proposes an engine speed recoupling speed regulation algorithm. By reconstructing the engine target speed, the power shunted by the sun gear is minimized, thereby greatly reducing the efficiency loss under the power cycle conditions of the planetary gear set. The efficiency under the power cycle conditions is improved by 81.8%. Combined with the aforementioned power improvement effect, this configuration meets the power requirements of commercial vehicles under heavy-load climbing conditions while reducing the overall vehicle efficiency loss, representing a novel hybrid configuration for new energy commercial vehicles.

[0075] like Figure 2 As shown, the vehicle controller 10 includes at least one processor 11 and a memory, such as ROM 12 or RAM 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded into the RAM 13 from the storage unit 18. The RAM 13 can also store various programs and data required for the operation of the vehicle controller 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An I / O interface 15 is also connected to the bus 14. The ROM 12 is a read-only memory, the RAM 13 is a random access memory, and the I / O interface 15 is an input / output interface.

[0076] Multiple components in the vehicle controller 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, optical disk, etc.; and a communication unit 19, such as a network card, modem, wireless transceiver, etc. The communication unit 19 allows the vehicle controller 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0077] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as vehicle control methods.

[0078] In some embodiments, the vehicle control method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the vehicle controller 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the vehicle control method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the vehicle control method by any other suitable means (e.g., by means of firmware).

[0079] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0080] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0081] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, RAM, ROM, erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0082] To provide interaction with the user, the systems and techniques described herein can be implemented on a vehicle controller having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the vehicle controller. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0083] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0084] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS servers, such as high management difficulty and weak business scalability.

[0085] This application also discloses a computer program product, which includes a computer program that, when executed by a processor, implements the vehicle control method provided in any embodiment of this application. This program product shares the same inventive concept as the vehicle control methods disclosed in the embodiments of this application, and therefore will not be described in detail here.

[0086] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0087] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A vehicle control method, characterized in that, include: Based on the current vehicle throttle opening and current vehicle speed, interpolate the preset vehicle power demand MAP table to calculate the current total power demand of the vehicle. When the current vehicle speed is greater than the first preset vehicle speed, the target engine speed in the sun gear lock-up mode is calculated based on the planetary gear set characteristic value, the second shaft AMT output shaft speed of the second gear transmission, and the second gear AMT transmission ratio. Based on the engine target speed and engine external characteristic curve in the sun gear lock-up mode, determine the upper limit of the external characteristic power corresponding to the engine target speed in the sun gear lock-up mode; If the upper limit of the external characteristic power is less than the current total power demand of the vehicle, and the current vehicle speed is greater than the first preset vehicle speed, then the clutch lock is activated, and the current vehicle hybrid configuration is determined to be a parallel P2 configuration. If the current total power demand of the vehicle is greater than the sum of the maximum power at the current vehicle speed and the preset power fluctuation value, or if the current vehicle speed is less than the first preset reference speed, then the clutch lock is released, and the current vehicle hybrid configuration is determined to be a series-parallel PS configuration.

2. The method according to claim 1, characterized in that, After determining that the current vehicle hybrid configuration is a series-parallel PS configuration, the following is also included: Based on the current total power demand of the vehicle and the engine preset economic curve, calculate the engine target speed and engine target torque in the decoupled speed regulation mode. The sun gear speed in the decoupled speed regulation mode is calculated based on the engine target speed, planetary gear set characteristic value, second-gear AMT output shaft speed, and the second-gear AMT transmission ratio. When the sun gear speed in decoupling mode is greater than the first preset sun gear speed, the engine is set to decoupling speed regulation mode; When the sun gear speed in decoupling mode is less than the first preset sun gear reference speed, the engine is set to soft coupling speed regulation mode.

3. The method according to claim 2, characterized in that, When the sun gear speed in decoupling mode is greater than the first preset sun gear speed, after setting the engine to decoupling speed regulation mode, the following is also included: When the sun gear speed in decoupling mode is greater than the first preset sun gear speed, the first speed regulating torque of the sun gear generator is calculated based on the engine target torque, the planetary gear set characteristic value, the difference between the engine target speed and the actual engine speed in decoupling speed regulation mode, and the proportional-integral coefficient. The engine speed is adjusted based on the first speed-regulating torque of the solar generator.

4. The method according to claim 2, characterized in that, When the sun gear speed in decoupling mode is less than the first preset sun gear reference speed, after setting the engine to soft coupling speed regulation mode, the following is also included: Based on the preset number of interval segments, the economic speed range of the engine is discretized to obtain the speed segment step size; The first target value of engine speed under the solar gear power generation state is calculated based on the speed segment step size, the target speed under the solar gear power generation state, the planetary gear set characteristic value, and the second gear AMT transmission ratio. The second target value of engine speed under sun gear drive state is calculated based on the target speed of the sun gear drive state, the characteristic value of the planetary gear set, the transmission ratio of the second gear AMT, the speed segment step size, and the output shaft speed of the second gear AMT. Based on the first target value of engine speed, the second target value of engine speed, and the economic speed range of the engine, the engine reconfiguration speed is determined; The second speed regulating torque of the sun gear generator is calculated based on the engine reconfiguration speed, the planetary gear set characteristic value, the difference between the engine reconfiguration speed and the actual engine speed in the soft coupling speed regulation mode, and the proportional-integral coefficient. The engine speed is adjusted based on the second speed-regulating torque of the solar generator.

5. The method according to claim 4, characterized in that, Based on the speed segment step size, the target speed of the engine in the solar power generation state, the planetary gear set characteristic value, and the second-gear AMT transmission ratio, the first target value of the engine speed in the solar power generation state is calculated, including: The first target value of the engine speed under solar power generation conditions is calculated based on the following formula: ； in, The target rotational speed of the solar gear during power generation is represented by k, and the characteristic value of the planetary gear set is represented by k. This indicates the gear ratio of the second-gear AMT. This indicates the step size of the rotational speed segments. This represents the floor function. This represents the first target value of the engine speed. This indicates the output shaft speed of the second-gear AMT.

6. The method according to claim 5, characterized in that, Based on the target speed in the sun gear drive state, the planetary gear set characteristic value, the second-gear AMT transmission ratio, the speed segment step size, and the second-gear AMT output shaft speed, calculate the second target value of the engine speed in the sun gear drive state, including: The second target value of engine speed under sun gear drive condition is calculated based on the following formula: ； in, This indicates the target rotational speed of the sun gear drive state. This represents the second target value of the engine speed during the solar power generation state.

7. A vehicle controller, characterized in that, The vehicle controller includes: At least one processor, and a memory communicatively connected to said at least one processor; The memory stores a computer program that can be executed by the at least one processor, which is then executed by the at least one processor to enable the at least one processor to perform the vehicle control method according to any one of claims 1-6.

8. A hybrid power system, characterized in that, Includes the vehicle controller, single planetary gear set, two-speed AMT, generator, engine, drive motor, and lock-up clutch as described in claim 7; The vehicle controller controls the generator, the engine, the drive motor, and the lock-up clutch. The engine is connected to the planet carrier of the single planetary gear set, and the torque of the ring gear of the single planetary gear set is coupled with the torque of the drive motor and transmitted to the two-speed AMT.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the vehicle control method of any one of claims 1-6.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the vehicle control method according to any one of claims 1-6.

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