Methods and toolkits for determining the optimal economic operating point for hybrid vehicles, intermediate vehicles, and equipment.

Abstract

Invention details;

Description

Method, device, vehicle, medium and equipment for determining the optimal economic operating point of a hybrid vehicle

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 10, 2023, with application number 2023102320569 and application name “A method, device, vehicle, medium and equipment for determining the optimal economic operating point of a hybrid vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of hybrid vehicle control, and in particular to a method, device, vehicle, medium, and equipment for determining the optimal economic operating point of a hybrid vehicle. Background Art

[0003] Hybrid vehicles (HEVs) use two energy sources: fuel and batteries. The key to achieving low fuel consumption lies in coordinating the operation of the engine and motor to maximize the combined utilization of these two energy sources. However, during vehicle operation, the engine and motor can operate at multiple operating points, each resulting in varying energy consumption. These operating points are also subject to different driving modes and limitations. Therefore, accurately determining the vehicle's optimal economic operating point to maximize combined energy utilization has become a pressing challenge for engineers.

[0004] Summary of the Invention

[0005] The present application provides a method, apparatus, vehicle, medium, and equipment for determining the optimal economic operating point of a hybrid vehicle. The method calculates the driver's wheel-end torque requirement based on the actual operating parameters of the vehicle at the current operating point, and simultaneously calculates the vehicle's most economical operating point in different driving modes. The optimal economic operating point of the hybrid vehicle is determined by calculating the equivalent fuel consumption power at the current operating point and the optimal equivalent fuel consumption power corresponding to the vehicle's most economical operating point in different driving modes, thereby achieving the highest comprehensive energy utilization rate.

[0006] The technical solution of this application is:

[0007] The present application provides a method for determining an optimal economic operating point of a hybrid vehicle, wherein the hybrid vehicle comprises at least: a power battery, an engine, a drive motor, a generator, and a clutch, wherein the engine can be coupled to or disconnected from a wheel end via the clutch, the drive motor is directly connected to the wheel end, the drive motor is connected to the power battery, the generator is connected to the engine, and the generator is connected to the power battery and / or the drive motor. The method comprises:

[0008] Obtain the actual operating parameters and equivalent fuel consumption power corresponding to the vehicle at the current working point;

[0009] Based on the actual operating parameters of the vehicle at the current operating point, determine the most economical operating point of the vehicle under different driving modes and the optimal equivalent fuel consumption power corresponding to the most economical operating point;

[0010] The optimal economic operating point of the hybrid vehicle is determined based on the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in all driving modes and the equivalent fuel consumption power corresponding to the vehicle's current operating point.

[0011] Preferably, the vehicle driving mode includes a series mode and a parallel mode. The step of determining the most economical operating point of the vehicle in the series mode and the parallel mode and the optimal equivalent fuel consumption power corresponding to the most economical operating point, based on actual operating parameters corresponding to the current operating point of the vehicle, includes:

[0012] determining target operating parameters corresponding to a plurality of operating points of the vehicle in a corresponding driving mode;

[0013] determining equivalent fuel consumption power corresponding to the plurality of operating points of the vehicle in the corresponding driving mode based on actual operating parameters corresponding to the current operating point of the vehicle and target operating parameters corresponding to the plurality of operating points of the vehicle in the corresponding driving mode;

[0014] An equivalent fuel consumption power with the smallest median value of equivalent fuel consumption powers corresponding to multiple operating points of the vehicle in a corresponding driving mode is determined as the optimal equivalent fuel consumption power, and an operating point corresponding to the optimal equivalent fuel consumption power is determined as the most economical operating point of the vehicle in the corresponding driving mode.

[0015] Preferably, the target operating parameters of multiple working points in the series mode are specifically determined as follows:

[0016] First, find the most economical operating point of the engine in series mode in the engine's universal characteristic curve;

[0017] Taking the target engine power corresponding to the most economical operating point of the engine as the reference power point, N power points are added or subtracted at equal intervals on the optimal fuel economy curve of the engine to obtain a total of 2N+1 power points, and the 2N+1 power points are determined as multiple operating points in the series mode;

[0018] Determine the engine target torque, engine target speed, engine target power loss, generator target torque, generator target speed, generator target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge power loss, and battery target SOC corresponding to the 2N+1 power points respectively;

[0019] The engine target torque, engine target speed, engine target power loss, generator target torque, generator target speed, generator target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge loss power and battery target SOC corresponding to each power point are determined as the target operating parameters of an operating point in the series mode.

[0020] Preferably, the target operating parameters of multiple working points in the parallel mode are specifically determined as follows:

[0021] First, find the most economical operating point of the engine in parallel mode on the engine's optimal fuel economy curve;

[0022] Taking the target engine torque corresponding to the most economical operating point of the engine as the reference torque point, N torque points are added or subtracted at equal intervals to obtain a total of 2N+1 torque points, and the 2N+1 torque points are determined as multiple operating points in the parallel mode;

[0023] Determine the target engine speed, target engine torque, target engine power loss, target drive motor torque, target drive motor power loss, target battery charge and discharge power loss, and target battery SOC corresponding to the 2N+1 torque points respectively;

[0024] The engine target speed, engine target torque, engine target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge loss power and battery target SOC corresponding to each torque point are determined as the target operating parameters of an operating point in parallel mode.

[0025] Preferably, the vehicle's driving mode also includes a pure electric mode. The steps of determining the most economical operating point of the vehicle in the pure electric mode and the optimal equivalent fuel consumption power corresponding to the most economical operating point, based on actual operating parameters of the vehicle at the current operating point, include:

[0026] Determine the driver's wheel-end torque requirement and battery target SOC based on the actual operating parameters of the vehicle at the current operating point;

[0027] Based on the driver's wheel-end torque requirement, the target torque of the drive motor, the target power loss of the drive motor, and the target charging and discharging power loss of the battery are determined in pure electric mode.

[0028] An operating point corresponding to the target torque of the drive motor, the target power loss of the drive motor, the target charge and discharge loss power of the battery, and the target SOC of the battery is determined as the most economical operating point of the vehicle in pure electric mode, and the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in pure electric mode is determined based on the actual operating parameters of the vehicle corresponding to the current operating point, the target torque of the drive motor, the target power loss of the drive motor, the target charge and discharge loss power of the battery, and the target SOC of the battery.

[0029] Preferably, the actual operating parameters corresponding to the vehicle at the current operating point include: vehicle speed, accelerator pedal signal, ambient temperature, altitude, and battery temperature. The step of determining the driver's wheel-end required torque and the battery target SOC based on the actual operating parameters corresponding to the vehicle at the current operating point includes:

[0030] Determine the driver's wheel-end torque requirement based on vehicle speed and accelerator pedal signal;

[0031] Determine the battery target SOC for different driving modes based on ambient temperature, altitude, and battery temperature;

[0032] Under the same ambient temperature, altitude and battery temperature conditions, different driving modes correspond to different battery target SOCs.

[0033] Preferably, the actual operating parameters corresponding to the current operating point of the vehicle further include: a real-time SOC of the battery and a current speed of the drive motor. Based on the actual operating parameters corresponding to the current operating point of the vehicle and the target operating parameters corresponding to the operating point of the vehicle in the series mode, the step of determining the equivalent fuel consumption power corresponding to the operating point of the vehicle in the series mode includes:

[0034] By formula: J 串 =P fuel串 (t)+s 串 (t)*P batt串 (t)

[0035] To calculate the equivalent fuel consumption power J corresponding to the working point in series mode 串 , s 串 (t) is the equivalent factor corresponding to the operating point in series mode, and its value is obtained by looking up a predetermined relationship table of the battery real-time SOC, the battery target SOC corresponding to the operating point in series mode, and the equivalent factor in series mode;

[0036] P fuel串 (t) is the fuel consumption power corresponding to the working point in series mode, P fuel串(t) = (target engine speed corresponding to the operating point in series mode * target engine torque corresponding to the operating point in series mode) / 9550 + target engine power loss corresponding to the operating point in series mode;

[0037] P batt串 (t) is the power consumption corresponding to the working point in series mode, P batt串 (t) = (generator target speed corresponding to the working point in series mode * generator target torque corresponding to the working point in series mode) / 9550 + generator target loss power corresponding to the working point in series mode + (drive motor current speed * drive motor target torque corresponding to the working point in series mode) / 9550 + drive motor target loss power corresponding to the working point in series mode + battery target charge and discharge loss power corresponding to the working point in series mode.

[0038] Preferably, the actual operating parameters corresponding to the current operating point of the vehicle further include: a real-time SOC of the battery and a current speed of the drive motor. Based on the actual operating parameters corresponding to the current operating point of the vehicle and the target operating parameters corresponding to the operating point of the vehicle in the parallel mode, the step of determining the equivalent fuel consumption power corresponding to the operating point of the vehicle in the parallel mode includes:

[0039] By formula: J 并 =P fuel并 (t)+s 并 (t)*P batt并 (t)

[0040] To calculate the equivalent fuel consumption power J corresponding to the working point in parallel mode 并 , s 并 (t) is the equivalent factor corresponding to the operating point in parallel mode, and its value is obtained by looking up a predetermined relationship table of the battery real-time SOC, the battery target SOC corresponding to the operating point in parallel mode, and the equivalent factor in parallel mode;

[0041] P fuel并 (t) is the fuel consumption power corresponding to the working point in parallel mode, P fuel并 (t) = (target engine speed corresponding to the operating point in parallel mode * target engine torque corresponding to the operating point in parallel mode) / 9550 + target engine power loss corresponding to the operating point in parallel mode;

[0042] P batt并 (t) is the power consumption corresponding to the working point in parallel mode, P batt并(t) = (current speed of the driving motor * target torque of the driving motor corresponding to the working point in parallel mode) / 9550 + target loss power of the driving motor corresponding to the working point in parallel mode + target charge and discharge loss power of the battery corresponding to the working point in parallel mode.

[0043] Preferably, the actual operating parameters corresponding to the vehicle at the current operating point further include: a real-time SOC of the battery and a current speed of the drive motor. The step of determining the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in pure electric mode based on the actual operating parameters corresponding to the vehicle at the current operating point, the target torque of the drive motor, the target power loss of the drive motor, the target charge and discharge power loss of the battery, and the target SOC of the battery includes:

[0044] By formula: J EV =s EV (t)*P battEV (t)

[0045] To calculate the equivalent fuel consumption power J corresponding to the working point in pure electric mode EV , s EV (t) is the equivalent factor corresponding to the operating point in pure electric mode, and its value is obtained by looking up a predetermined relationship table of the battery real-time SOC, the battery target SOC corresponding to the operating point in pure electric mode, and the equivalent factor in pure electric mode;

[0046] P battEV (t) is the power consumption corresponding to the working point in pure electric mode, P battEV (t) = current speed of the driving motor * target torque of the driving motor corresponding to the working point in pure electric mode / 9550 + target loss power of the driving motor corresponding to the working point in pure electric mode + target charge and discharge loss power of the battery corresponding to the working point in pure electric mode.

[0047] Preferably, the step of determining the optimal economic operating point of the hybrid vehicle based on the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in all driving modes and the equivalent fuel consumption power corresponding to the current operating point of the vehicle includes:

[0048] Take the minimum value of the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in all driving modes;

[0049] If the difference between the equivalent fuel consumption power corresponding to the current working point of the vehicle and the minimum value is greater than or equal to the preset calibration value, the working point corresponding to the minimum value is determined as the optimal economic working point;

[0050] If the difference between the equivalent fuel consumption power corresponding to the vehicle at the current operating point and the minimum value is less than the preset calibration value, the current operating point of the vehicle is determined as the optimal economic operating point.

[0051] The present application provides a device for determining the optimal economic operating point of a hybrid vehicle, wherein the hybrid vehicle comprises at least: a power battery, an engine, a drive motor, a generator, and a clutch, wherein the engine can be coupled to or disconnected from a wheel end via the clutch, the drive motor is directly connected to the wheel end, the drive motor is connected to the power battery, the generator is connected to the engine, and the generator is connected to the power battery and / or the drive motor. The device comprises:

[0052] An acquisition module is used to obtain the actual operating parameters and equivalent fuel consumption power corresponding to the vehicle at the current working point;

[0053] The most economical parameter determination module is used to determine the most economical operating point of the vehicle under different driving modes and the optimal equivalent fuel consumption power corresponding to the most economical operating point based on the actual operating parameters of the vehicle at the current operating point;

[0054] The optimal economic operating point determination module is used to determine the optimal economic operating point of the hybrid vehicle based on the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in all driving modes and the equivalent fuel consumption power corresponding to the current operating point of the vehicle.

[0055] Preferably, the driving mode of the vehicle includes a series mode and a parallel mode, and the most economical parameter determination module includes:

[0056] a determination unit, configured to determine target operating parameters corresponding to a plurality of operating points of the vehicle in a corresponding driving mode;

[0057] an equivalent fuel consumption power determination unit, configured to determine the equivalent fuel consumption power corresponding to a plurality of operating points of the vehicle in the corresponding driving mode based on actual operating parameters of the vehicle corresponding to the current operating point and target operating parameters of the vehicle corresponding to the plurality of operating points in the corresponding driving mode;

[0058] The first most economical parameter determination unit is used to determine an equivalent fuel consumption power with the smallest median equivalent fuel consumption power corresponding to multiple operating points of the vehicle in the corresponding driving mode as the optimal equivalent fuel consumption power, and to determine an operating point corresponding to the optimal equivalent fuel consumption power as the most economical operating point of the vehicle in the corresponding driving mode.

[0059] Preferably, when the driving mode of the vehicle is the series mode, the determining unit is specifically configured to:

[0060] First, find the most economical operating point of the engine in series mode in the engine's universal characteristic curve;

[0061] Taking the target engine power corresponding to the most economical operating point of the engine as the reference power point, N power points are added or subtracted at equal intervals on the optimal fuel economy curve of the engine to obtain a total of 2N+1 power points, and the 2N+1 power points are determined as multiple operating points in the series mode;

[0062] Determine the engine target torque, engine target speed, engine target power loss, generator target torque, generator target speed, generator target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge power loss, and battery target SOC corresponding to the 2N+1 power points respectively;

[0063] The engine target torque, engine target speed, engine target power loss, generator target torque, generator target speed, generator target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge loss power and battery target SOC corresponding to each power point are determined as the target operating parameters of an operating point in the series mode.

[0064] Preferably, when the driving mode of the vehicle is the parallel mode, the determining unit is specifically configured to:

[0065] First, find the most economical operating point of the engine in parallel mode on the engine's optimal fuel economy curve;

[0066] Taking the target engine torque corresponding to the most economical operating point of the engine as the reference torque point, N torque points are added or subtracted at equal intervals to obtain a total of 2N+1 torque points, and the 2N+1 torque points are determined as multiple operating points in the parallel mode;

[0067] Determine the target engine speed, target engine torque, target engine power loss, target drive motor torque, target drive motor power loss, target battery charge and discharge power loss, and target battery SOC corresponding to the 2N+1 torque points respectively;

[0068] The engine target speed, engine target torque, engine target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge loss power and battery target SOC corresponding to each torque point are determined as the target operating parameters of an operating point in parallel mode.

[0069] Preferably, the driving mode of the vehicle further includes a pure electric mode, and the most economical parameter determination module further includes:

[0070] A required torque and SOC determination unit is used to determine the driver's wheel-end required torque and the battery target SOC based on the actual operating parameters corresponding to the vehicle at the current operating point;

[0071] A drive motor and battery parameter determination unit, configured to determine the target drive motor torque, target drive motor power loss, and target battery charge and discharge power loss for the vehicle in pure electric mode based on the driver's wheel-end torque requirement;

[0072] The second most economical parameter determination unit is used to determine an operating point corresponding to the drive motor target torque, the drive motor target loss power, the battery target charge and discharge loss power and the battery target SOC as the most economical operating point of the vehicle in pure electric mode, and determine the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in pure electric mode based on the actual operating parameters corresponding to the vehicle at the current operating point, the drive motor target torque, the drive motor target loss power, the battery target charge and discharge loss power and the battery target SOC.

[0073] Preferably, the optimal economic operating point determination module includes:

[0074] A minimum value selection unit is used to select the minimum value from the optimal equivalent fuel consumption power corresponding to the most economical working point of the vehicle in all driving modes;

[0075] A first optimal economic operating point determination unit is configured to determine the operating point corresponding to the minimum value as the optimal economic operating point if the difference between the equivalent fuel consumption power corresponding to the current operating point of the vehicle and the minimum value is greater than or equal to a preset calibration value;

[0076] The second optimal economic operating point determination unit is configured to determine the current operating point of the vehicle as the optimal economic operating point if the difference between the equivalent fuel consumption power corresponding to the current operating point of the vehicle and the minimum value is less than a preset calibration value.

[0077] The present application also provides a vehicle, comprising the above-mentioned device for determining a target driving mode of a hybrid vehicle based on an economy perspective.

[0078] The present application also provides a control device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the method for determining the optimal economic operating point of a hybrid vehicle as described above are implemented.

[0079] The present application also provides a readable storage medium, which stores a program or instruction. When the program or instruction is executed by a processor, the steps of the method for determining the optimal economic operating point of a hybrid vehicle as described above are implemented.

[0080] The present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the steps of the method for determining the optimal economic operating point of a hybrid vehicle as described above.

[0081] The beneficial effects of this application are:

[0082] The driver's wheel-end torque requirement is calculated based on the actual operating parameters of the vehicle at the current operating point, and the most economical operating point at which the vehicle can operate in different driving modes is calculated. The optimal economic operating point of the vehicle is determined by calculating the equivalent fuel consumption power at the current operating point and the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle under different driving modes. The vehicle can always operate at the optimal economic operating point, achieve the lowest energy consumption, improve the vehicle's comprehensive cruising range, and bring users an ultimate long-range experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] FIG1 is a flow chart of a method for controlling an optimal economic operating point of a hybrid vehicle in this embodiment;

[0084] FIG2 is a structural block diagram of a control device for an optimal economic operating point of a hybrid vehicle in this embodiment. DETAILED DESCRIPTION

[0085] The following will describe the embodiments of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand the other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for the purpose of illustrating the present application and are not intended to limit the scope of protection of the present application.

[0086] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. Therefore, the illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0087] Because hybrid vehicles in the prior art only consider some vehicle calibration data when selecting a drive mode, the accuracy of determining the target drive mode of the vehicle is not high. To address this problem, embodiments of the present application provide a method for controlling the optimal economic operating point of a hybrid vehicle. This method no longer relies solely on the accuracy of the SOC and vehicle speed signals and calibration experience. Instead, it calculates the driver's wheel-end torque demand based on the actual operating parameters corresponding to the vehicle's current operating point, and simultaneously calculates the vehicle's most economical operating point under different drive modes. The vehicle's optimal economic operating point is determined by calculating the equivalent fuel consumption power at the current operating point and the optimal equivalent fuel consumption power corresponding to the vehicle's most economical operating point under different drive modes, allowing the vehicle to always operate at the state with the highest comprehensive energy utilization rate.

[0088] As shown in FIG1 , the determination of the optimal economic operating point of the hybrid vehicle provided in this embodiment specifically includes:

[0089] Step S10: obtaining the actual operating parameters and equivalent fuel consumption power corresponding to the vehicle at the current operating point.

[0090] The actual operating parameters corresponding to the vehicle at the current working point include: vehicle speed, accelerator pedal signal, battery real-time SOC, current speed of the drive motor, ambient temperature, altitude and battery temperature.

[0091] The aforementioned vehicle speed and accelerator pedal signals are collected in real time by relevant sensors on the vehicle. The battery's real-time SOC is obtained from the battery control unit, the current drive motor speed is obtained from the drive motor control unit, the ambient temperature and altitude are obtained from the engine control unit, and the battery temperature is obtained from the battery control unit.

[0092] Step S20 , combining actual operating parameters of the vehicle at the current operating point, determining the most economical operating point of the vehicle under different driving modes and the optimal equivalent fuel consumption power corresponding to the most economical operating point.

[0093] In this embodiment, the vehicle's driving modes include pure electric mode, series mode, and parallel mode.

[0094] Determine the driver's wheel-end torque requirement based on the vehicle's actual operating parameters at the current operating point

[0095] In the series mode and the parallel mode, step S20 specifically includes:

[0096] Step S211 : determining target operating parameters corresponding to a plurality of operating points of the vehicle in a corresponding driving mode.

[0097] Step S212 , determining the equivalent fuel consumption power corresponding to the multiple operating points of the vehicle in the corresponding driving mode based on the actual operating parameters corresponding to the current operating point of the vehicle and the target operating parameters corresponding to the multiple operating points of the vehicle in the corresponding driving mode.

[0098] In step S213, an equivalent fuel consumption power having the smallest median equivalent fuel consumption power corresponding to a plurality of operating points of the vehicle in the corresponding driving mode is determined as the optimal equivalent fuel consumption power, and an operating point corresponding to the optimal equivalent fuel consumption power is determined as the most economical operating point of the vehicle in the corresponding driving mode.

[0099] In step S211, the target operating parameters of the multiple working points in the series mode are specifically determined as follows:

[0100] First, find the most economical operating point of the engine in series mode in the engine's universal characteristic curve;

[0101] Taking the target engine power corresponding to the most economical operating point of the engine as the reference power point, N power points are added or subtracted at equal intervals on the optimal fuel economy curve of the engine to obtain a total of 2N+1 power points, and the 2N+1 power points are determined as multiple operating points in the series mode;

[0102] Determine the engine target torque, engine target speed, engine target power loss, generator target torque, generator target speed, generator target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge power loss, and battery target SOC corresponding to the 2N+1 power points respectively;

[0103] The engine target torque, engine target speed, engine target power loss, generator target torque, generator target speed, generator target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge loss power and battery target SOC corresponding to each power point are determined as the target operating parameters of an operating point in the series mode.

[0104] The target engine torque and target engine speed are determined by combining the engine's most economical operating point with the engine's optimal fuel economy curve. The engine's most economical operating point is derived from a pre-calibrated universal engine characteristic curve that correlates fuel consumption, speed, and torque. The engine's optimal fuel economy curve is derived from a pre-calibrated universal engine characteristic curve that correlates fuel consumption, speed, and torque.

[0105] The target engine power loss is determined by looking up the engine target torque and the target engine speed in a table.

[0106] Furthermore, in combination with the transmission speed ratio from the engine to the generator, the corresponding generator target torque, generator target speed, and generator target power loss are determined based on the engine target torque, engine target speed, and engine target power loss.

[0107] The target torque for the drive motor is determined by the current drive motor speed, the driver's wheel-end torque requirement, and the speed ratio from the drive motor to the vehicle. The driver's wheel-end torque requirement is derived from a pre-calibrated table that compares vehicle speed with the accelerator pedal signal.

[0108] The target battery charge and discharge power is determined by the generator target torque, generator target speed, generator target power loss, drive motor target torque, drive motor current speed, and drive motor target power loss. Here, the target battery charge and discharge power = drive motor target power (calculated based on the actual drive motor speed and drive motor target torque) + drive motor target power loss (determined by looking up the actual drive motor speed and drive motor target torque) + generator target generated power (calculated based on the generator target speed and generator target torque) + generator target power loss (determined by looking up the generator target speed and generator target torque).

[0109] Then, the target charge and discharge loss power of the battery is determined by looking up the table according to the target charge and discharge power of the battery.

[0110] Taking the engine target power at the most economical operating point of the above-mentioned engine as a benchmark, N preset power Mkw are increased or N power Mkw are decreased, such as increasing or decreasing 1kw, 2kw, 3kw...Nkw respectively, to obtain a total of 2N+1 power points; then the engine target power corresponding to the 2N+1 power points can be obtained, and according to the engine's optimal fuel economy operating curve, the 2N+1 power points are obtained, and the corresponding engine target torque, engine target speed, engine target power loss, generator target torque, generator target speed, generator target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge loss power and battery target SOC are obtained, and the above calculation is repeated to obtain the equivalent fuel consumption power of the 2N+1 power points in series mode.

[0111] In step S211, the target operating parameters of the multiple operating points in the parallel mode are specifically determined as follows:

[0112] First, find the most economical operating point of the engine in parallel mode on the engine's optimal fuel economy curve;

[0113] Taking the target engine torque corresponding to the most economical operating point of the engine as the reference torque point, N torque points are added or subtracted at equal intervals to obtain a total of 2N+1 torque points, and the 2N+1 torque points are determined as multiple operating points in the parallel mode;

[0114] Determine the target engine speed, target engine torque, target engine power loss, target drive motor torque, target drive motor power loss, target battery charge and discharge power loss, and target battery SOC corresponding to the 2N+1 torque points respectively;

[0115] The engine target speed, engine target torque, engine target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge loss power and battery target SOC corresponding to each torque point are determined as the target operating parameters of an operating point in parallel mode.

[0116] The target engine speed is obtained from the actual speed of the drive motor and the speed ratio from the engine to the drive motor.

[0117] The optimal fuel economy curve is obtained from the engine universal curve.

[0118] In parallel mode, the target engine speed is calculated by dividing the current drive motor speed by the engine-to-drive motor transmission ratio. The target engine torque is determined by the target engine speed and the engine's optimal fuel economy curve, which is derived from a pre-calibrated engine universal characteristic curve that correlates fuel consumption, speed, and torque. The target drive motor torque is determined by the driver's wheel-end torque requirement, the target engine torque, the engine-to-wheel speed ratio, and the drive motor-to-wheel speed ratio. The driver's wheel-end torque requirement is determined by looking up a table that correlates the pre-calibrated vehicle speed and accelerator pedal signal. The target engine power loss is determined by looking up a pre-calibrated engine power loss table that correlates the target engine speed and target torque. The target battery charge and discharge power is determined by the current drive motor speed, the target drive motor torque, and the target drive motor power loss.

[0119] Taking the engine target torque at the most economical operating point of the above-mentioned engine as a benchmark, increase or decrease N torques Mnm, such as increasing or decreasing by 1nm, 2nm, 3nm...Nnm respectively, to obtain a total of 2N+1 torque points; obtain the engine target torque, drive motor target torque, engine target power loss, drive motor target power loss, and battery target charging and discharging loss power corresponding to the 2N+1 torque points; and repeat the above calculation to obtain 2N+1 equivalent fuel consumption efficiencies.

[0120] In step S212, the step of determining the equivalent fuel consumption power corresponding to the vehicle's operating point in the series mode based on the actual operating parameters corresponding to the vehicle's current operating point and the target operating parameters corresponding to the vehicle's operating point in the series mode includes:

[0121] By formula: J 串 =P fuel串 (t)+s 串 (t)*P batt串 (t)

[0122] To calculate the equivalent fuel consumption power J corresponding to the working point in series mode 串 , s 串 (t) is the equivalent factor corresponding to the operating point in series mode, and its value is obtained by looking up a predetermined relationship table of the battery real-time SOC, the battery target SOC corresponding to the operating point in series mode, and the equivalent factor in series mode;

[0123] P fuel串 (t) is the fuel consumption power corresponding to the working point in series mode, P fuel串 (t) = (target engine speed corresponding to the operating point in series mode * target engine torque corresponding to the operating point in series mode) / 9550 + target engine power loss corresponding to the operating point in series mode;

[0124] P batt串 (t) is the power consumption corresponding to the working point in series mode, P batt串 (t) = (generator target speed corresponding to the working point in series mode * generator target torque corresponding to the working point in series mode) / 9550 + generator target loss power corresponding to the working point in series mode + (drive motor current speed * drive motor target torque corresponding to the working point in series mode) / 9550 + drive motor target loss power corresponding to the working point in series mode + battery target charge and discharge loss power corresponding to the working point in series mode.

[0125] Similarly, in step S212, the step of determining the equivalent fuel consumption power corresponding to the vehicle's operating point in the parallel mode based on the actual operating parameters corresponding to the vehicle's current operating point and the target operating parameters corresponding to the vehicle's operating point in the parallel mode includes:

[0126] By formula: J 并 =P fuel并 (t)+s 并 (t)*P batt并 (t)

[0127] To calculate the equivalent fuel consumption power J corresponding to the working point in parallel mode 并 , s并 (t) is the equivalent factor corresponding to the operating point in parallel mode, and its value is obtained by looking up a predetermined relationship table of the battery real-time SOC, the battery target SOC corresponding to the operating point in parallel mode, and the equivalent factor in parallel mode;

[0128] P fuel并 (t) is the fuel consumption power corresponding to the working point in parallel mode, P fuel并 (t) = (target engine speed corresponding to the operating point in parallel mode * target engine torque corresponding to the operating point in parallel mode) / 9550 + target engine power loss corresponding to the operating point in parallel mode;

[0129] P batt并 (t) is the power consumption corresponding to the working point in parallel mode, P batt并 (t) = (current speed of the driving motor * target torque of the driving motor corresponding to the working point in parallel mode) / 9550 + target loss power of the driving motor corresponding to the working point in parallel mode + target charge and discharge loss power of the battery corresponding to the working point in parallel mode.

[0130] In pure electric mode, step S20 includes:

[0131] Step S221 : Determine the driver's wheel-end torque requirement and the battery target SOC based on the actual operating parameters of the vehicle at the current operating point.

[0132] Step S222 : Based on the driver's wheel-end torque requirement, determine the target torque of the drive motor, the target loss power of the drive motor, and the target charge and discharge loss power of the battery in the pure electric mode.

[0133] In step S223, a working point corresponding to the target torque of the driving motor, the target power loss of the driving motor, the target charge and discharge loss power of the battery, and the target SOC of the battery is determined as the most economical working point of the vehicle in pure electric mode, and the optimal equivalent fuel consumption power corresponding to the most economical working point of the vehicle in pure electric mode is determined based on the actual operating parameters of the vehicle corresponding to the current working point, the target torque of the driving motor, the target power loss of the driving motor, the target charge and discharge loss power of the battery, and the target SOC of the battery.

[0134] In step S221, the driver's wheel-end torque requirement is determined based on the vehicle speed and the accelerator pedal signal. The driver's wheel-end torque requirement is obtained by looking up a table based on the vehicle speed and the accelerator pedal opening. The table is pre-calibrated with a predetermined correspondence between vehicle speed and accelerator pedal opening.

[0135] In step S221, the battery target SOC is determined based on the ambient temperature, altitude, and battery temperature. Predetermined correspondences between different ambient temperatures, altitudes, battery temperatures, and battery target SOCs are pre-calibrated, and the battery target SOCs corresponding to different driving modes are determined by table lookup. Under the same ambient temperature, altitude, and battery temperature conditions, different driving modes correspond to different battery target SOCs. Similarly, in this embodiment, the methods for determining the battery target SOCs in parallel mode and series mode in step S211 are consistent with those described herein.

[0136] In step S223, the step of determining the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in pure electric mode based on the actual operating parameters of the vehicle corresponding to the current operating point, the target torque of the drive motor, the target power loss of the drive motor, the target charge and discharge power loss of the battery, and the target SOC of the battery includes:

[0137] By formula: J EV =s EV (t)*P battEV (t)

[0138] To calculate the equivalent fuel consumption power J corresponding to the working point in pure electric mode EV , s EV (t) is the equivalent factor corresponding to the operating point in pure electric mode, and its value is obtained by looking up a predetermined relationship table of the battery real-time SOC, the battery target SOC corresponding to the operating point in pure electric mode, and the equivalent factor in pure electric mode;

[0139] P battEV (t) is the power consumption corresponding to the working point in pure electric mode, P battEV (t) = current speed of the driving motor * target torque of the driving motor corresponding to the working point in pure electric mode / 9550 + target loss power of the driving motor corresponding to the working point in pure electric mode + target charge and discharge loss power of the battery corresponding to the working point in pure electric mode.

[0140] The target torque of the drive motor is determined by the driver's wheel-end torque requirement in pure electric mode and the speed ratio from the drive motor to the wheel end.

[0141] Furthermore, the target power of the drive motor is obtained from the target torque of the drive motor in pure electric mode and the current speed of the drive motor. This technology is an existing technology, and the target charge and discharge power of the battery is determined by adding the above power to the loss power of the drive motor.

[0142] Furthermore, the battery target charge and discharge loss power is determined by looking up a predetermined correspondence table between the battery target charge and discharge power and the battery target charge and discharge loss power.

[0143] Step S30 , determining the optimal economic operating point of the hybrid vehicle based on the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in all driving modes and the equivalent fuel consumption power corresponding to the current operating point of the vehicle.

[0144] The step S30 specifically includes:

[0145] Step S311, taking the minimum value of the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in all driving modes;

[0146] Step S312: If the difference between the equivalent fuel consumption power corresponding to the current operating point of the vehicle and the minimum value is greater than or equal to a preset calibration value, the operating point corresponding to the minimum value is determined as the optimal economic operating point;

[0147] In step S313 , if the difference between the equivalent fuel consumption power corresponding to the current operating point of the vehicle and the minimum value is less than the preset calibration value, the current operating point of the vehicle is determined as the optimal economic operating point.

[0148] After determining the optimal economic operating point, the most economical driving mode for the vehicle can be determined, and the driving mode of the vehicle can be adjusted based on the economic perspective so that the vehicle operates at the optimal economic operating point. The above method in this embodiment no longer relies solely on the accuracy of the SOC and vehicle speed signals and calibration experience, but instead calculates the driver's wheel-end required torque based on the actual operating parameters corresponding to the vehicle at the current operating point, and simultaneously calculates the most economical operating point at which the vehicle can operate under different driving modes. By calculating the equivalent fuel consumption power at the current operating point and the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle under different driving modes, the optimal economic operating point of the vehicle is determined, so that the vehicle can always operate in a state with the highest comprehensive energy utilization rate, achieve the lowest energy consumption of the vehicle, improve the comprehensive cruising range of the vehicle, and bring users an extremely long-range experience.

[0149] As shown in FIG2 , the present application provides a device for determining the optimal economic operating point of a hybrid vehicle. The hybrid vehicle includes at least: a power battery, an engine, a drive motor, a generator, and a clutch. The engine can be connected to or disconnected from the wheel end via the clutch. The drive motor is directly connected to the wheel end. The drive motor is connected to the power battery, the generator is connected to the engine, and the generator is connected to the power battery and / or the drive motor. The device includes:

[0150] An acquisition module 101 is used to acquire actual operating parameters and equivalent fuel consumption power corresponding to the vehicle at the current operating point;

[0151] The most economical parameter determination module 102 is used to determine the most economical operating point of the vehicle under different driving modes and the optimal equivalent fuel consumption power corresponding to the most economical operating point based on the actual operating parameters of the vehicle at the current operating point;

[0152] The optimal economic operating point determination module 103 is used to determine the optimal economic operating point of the hybrid vehicle based on the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in all driving modes and the equivalent fuel consumption power corresponding to the current operating point of the vehicle.

[0153] Preferably, the driving mode of the vehicle includes a series mode and a parallel mode, and the most economical parameter determination module 102 includes:

[0154] a determination unit 1021 for determining target operating parameters corresponding to a plurality of operating points of the vehicle in a corresponding driving mode;

[0155] an equivalent fuel consumption power determination unit 1022 for determining the equivalent fuel consumption power corresponding to a plurality of operating points of the vehicle in the corresponding driving mode based on actual operating parameters of the vehicle corresponding to the current operating point and target operating parameters of the vehicle corresponding to a plurality of operating points in the corresponding driving mode;

[0156] The first most economical parameter determination unit 1023 is used to determine an equivalent fuel consumption power with the smallest median equivalent fuel consumption power corresponding to multiple operating points of the vehicle in the corresponding driving mode as the optimal equivalent fuel consumption power, and to determine an operating point corresponding to the optimal equivalent fuel consumption power as the most economical operating point of the vehicle in the corresponding driving mode.

[0157] Preferably, when the driving mode of the vehicle is the series mode, the determining unit 1021 is specifically configured to:

[0158] First, find the most economical operating point of the engine in series mode in the engine's universal characteristic curve;

[0159] Taking the target engine power corresponding to the most economical operating point of the engine as the reference power point, N power points are added or subtracted at equal intervals on the optimal fuel economy curve of the engine to obtain a total of 2N+1 power points, and the 2N+1 power points are determined as multiple operating points in the series mode;

[0160] Determine the engine target torque, engine target speed, engine target power loss, generator target torque, generator target speed, generator target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge power loss, and battery target SOC corresponding to the 2N+1 power points respectively;

[0161] The engine target torque, engine target speed, engine target power loss, generator target torque, generator target speed, generator target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge loss power and battery target SOC corresponding to each power point are determined as the target operating parameters of an operating point in the series mode.

[0162] Preferably, when the driving mode of the vehicle is the parallel mode, the determining unit 1021 is specifically configured to:

[0163] First, find the most economical operating point of the engine in parallel mode on the engine's optimal fuel economy curve;

[0164] Taking the target engine torque corresponding to the most economical operating point of the engine as the reference torque point, N torque points are added or subtracted at equal intervals to obtain a total of 2N+1 torque points, and the 2N+1 torque points are determined as multiple operating points in the parallel mode;

[0165] Determine the target engine speed, target engine torque, target engine power loss, target drive motor torque, target drive motor power loss, target battery charge and discharge power loss, and target battery SOC corresponding to the 2N+1 torque points respectively;

[0166] The engine target speed, engine target torque, engine target power loss, drive motor target torque, drive motor target power loss, battery target charge and discharge loss power and battery target SOC corresponding to each torque point are determined as the target operating parameters of an operating point in parallel mode.

[0167] Preferably, the driving mode of the vehicle further includes a pure electric mode, and the most economical parameter determination module 102 further includes:

[0168] The required torque and SOC determination unit 1024 is used to determine the driver's wheel-end required torque and the battery target SOC based on the actual operating parameters corresponding to the vehicle at the current operating point;

[0169] The drive motor and battery parameter determination unit 1025 is used to determine the drive motor target torque, the drive motor target loss power, and the battery target charge and discharge loss power of the vehicle in pure electric mode based on the driver's wheel-end torque requirement;

[0170] The second most economical parameter determination unit 1026 is used to determine an operating point corresponding to the drive motor target torque, the drive motor target loss power, the battery target charge and discharge loss power and the battery target SOC as the most economical operating point of the vehicle in pure electric mode, and determine the optimal equivalent fuel consumption power corresponding to the most economical operating point of the vehicle in pure electric mode based on the actual operating parameters corresponding to the vehicle at the current operating point, the drive motor target torque, the drive motor target loss power, the battery target charge and discharge loss power and the battery target SOC.

[0171] Preferably, the optimal economic operating point determination module 103 includes:

[0172] A minimum value selection unit 1031 is used to select the minimum value from the optimal equivalent fuel consumption power corresponding to the most economical working point of the vehicle in all driving modes;

[0173] The first optimal economic operating point determining unit 1032 is configured to determine the operating point corresponding to the minimum value as the optimal economic operating point if the difference between the equivalent fuel consumption power corresponding to the current operating point of the vehicle and the minimum value is greater than or equal to a preset calibration value;

[0174] The second optimal economic operating point determining unit 1033 is configured to determine the current operating point of the vehicle as the optimal economic operating point if the difference between the equivalent fuel consumption power corresponding to the current operating point of the vehicle and the minimum value is less than a preset calibration value.

[0175] In the above-mentioned device of this embodiment, each module can borrow the specific steps of the method in the above-mentioned embodiment when executing the specific logic process. The device has the same technical effect as the above-mentioned method.

[0176] The present application also provides a vehicle, including the above-mentioned method and device for determining the optimal economic operating point of the hybrid vehicle.

[0177] The present application also provides a control device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the method for determining the optimal economic operating point of a hybrid vehicle as described above are implemented.

[0178] The present application also provides a readable storage medium, which stores a program or instruction. When the program or instruction is executed by a processor, the steps of the method for determining the optimal economic operating point of a hybrid vehicle as described above are implemented.

[0179] The present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the steps of the method for determining the optimal economic operating point of a hybrid vehicle as described above.

[0180] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

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