Control method, device and equipment of hybrid electric vehicle and storage medium

Abstract

The invention discloses a control method, device and equipment of a hybrid electric vehicle and a storage medium, and relates to the technical field of hybrid electric vehicles, and the control method comprises the steps that the current driving mode, the current SOC, the current vehicle speed, the whole vehicle demand power and environment information of the vehicle are obtained; determining a vehicle state according to the environment information, the current driving mode and the current SOC; a range extender starting strategy is determined according to the vehicle state, and a range extender of the vehicle is controlled; when an engine of the range extender is started, determining a target operation mode and power generation power of the range extender according to the current vehicle speed and the required power of the whole vehicle; and determining the power generation rotating speed of the range extender according to the environment information and the power generation power of the range extender, and controlling the engine. The technical problems of low energy management efficiency and unstable operation caused by the fact that fixed threshold value control cannot adapt to environmental changes are solved, accurate matching of range extender start-stop control and power generation strategies under complex environmental conditions is achieved, and the energy utilization efficiency and the operation stability of the whole vehicle are improved.

Description

Technical Field

[0001] This application relates to the field of hybrid electric vehicle technology, and in particular to control methods, devices, equipment and storage media for hybrid electric vehicles. Background Technology

[0002] Range-extended hybrid electric vehicles need to achieve efficient energy management under different driving conditions to ensure that the vehicle can adapt to complex environmental conditions such as low temperature and high altitude while taking into account fuel economy, pure electric range and power performance, and avoid performance degradation or stalling due to battery depletion.

[0003] Current energy management strategies for range-extended hybrid electric vehicles typically rely on fixed battery charge thresholds to control the start-stop of the range extender, lacking dynamic adaptation to external conditions such as ambient temperature and atmospheric pressure. This strategy can easily lead to reduced battery charge and limited engine performance in low-temperature or high-altitude environments, resulting in a continuous decline in State of Charge (SOC) or frequent engine start-stop cycles, impacting overall vehicle energy efficiency and stability.

[0004] Currently, the question is how to provide an energy management strategy that dynamically adjusts the start-stop threshold of the range extender in order to improve the energy utilization efficiency and operational stability of range-extended hybrid electric vehicles in complex environments.

[0005] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0006] The main objective of this application is to provide a control method, device, equipment, and storage medium for hybrid electric vehicles, aiming to solve the technical problem of how to improve the energy utilization efficiency and operational stability of range-extended hybrid electric vehicles in complex environments.

[0007] To achieve the above objectives, this application proposes a control method for a hybrid electric vehicle, the method comprising: Obtain the vehicle's current driving mode, current SOC, current vehicle speed, total vehicle power demand, and environmental information; The target state of the vehicle is determined based on the environmental information, the current driving mode, and the current SOC. The vehicle's range extender activation strategy is determined based on the target state and the current driving mode; The range extender of the vehicle is controlled according to the range extender start-up strategy; When the engine of the range extender starts, the target operating mode of the range extender and the target power generation of the range extender in the target operating mode are determined based on the current vehicle speed and / or the vehicle power demand. The target power generation speed of the range extender is determined based on the environmental information and the target power generation capacity of the range extender. The engine is controlled by the target power generation speed of the range extender.

[0008] In one embodiment, determining the target state of the vehicle based on the environmental information, the current driving mode, and the current SOC includes: Obtain the SOC calibration value based on the current driving mode; Based on the environmental information, the current ambient temperature and current atmospheric pressure are obtained; The corresponding offset value is obtained by querying a preset offset table based on the current ambient temperature and the current atmospheric pressure. The SOC calibration value is adjusted based on the offset value to obtain the target SOC calibration value; The target state of the vehicle is determined based on the current driving mode and the target SOC calibration value.

[0009] In one embodiment, determining the vehicle's range extender activation strategy based on the target state and the current driving mode includes: When the current driving mode is pure electric mode or hybrid mode and the target state is the first target state, the range extender starting strategy of the vehicle is determined to be that the vehicle's engine does not start. When the current driving mode is pure electric mode or hybrid mode and the target state is the second target state, the range extender starting strategy of the vehicle is determined to be that the vehicle's engine starts according to the current vehicle speed and the total vehicle power demand. When the current driving mode is pure electric mode or hybrid mode and the target state is the third target state, the range extender starting strategy of the vehicle is determined to keep the vehicle's engine running, wherein the vehicle SOC corresponding to the first target state is greater than the vehicle SOC corresponding to the second target state, and the vehicle SOC corresponding to the second target state is greater than the vehicle SOC corresponding to the third target state.

[0010] In one embodiment, after determining that the vehicle's range extender starting strategy is to keep the vehicle's engine running when the target state is the third target state, the method further includes: When the vehicle's range extender start-up strategy is to keep the vehicle's engine running, the shutdown SOC calibration value is obtained; When the SOC value is greater than or equal to the shutdown SOC calibration value, the range extender of the vehicle is controlled to shut down.

[0011] In one embodiment, controlling the vehicle's range extender according to the range extender activation strategy includes: When the vehicle's range extender start-up strategy is to start the vehicle's engine based on the current vehicle speed and the vehicle's required power, start-up control conditions and shutdown control conditions are obtained. When the current vehicle speed and / or the required power of the vehicle meet the start-up control conditions, the range extender of the vehicle is controlled to start. When the current vehicle speed or the current SOC value meets the shutdown control condition, the range extender of the vehicle is controlled to shut down.

[0012] In one embodiment, determining the target operating mode of the range extender and the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the vehicle's power demand when the engine of the range extender starts includes: Obtain the vehicle speed calibration value in power follow mode, the power calibration value in power follow mode, and the available output power of the battery pack; If the current vehicle speed is greater than or equal to the power-following mode speed calibration value and the total vehicle power demand is greater than or equal to the power-following mode power calibration value, the target operating mode of the range extender is determined to be the power-following mode. When the required power of the vehicle is greater than or equal to the available output power of the battery pack, the target operating mode of the range extender is determined to be the power follower mode. Based on the current vehicle speed and / or the vehicle's required power, determine the target power generation of the range extender in the target operating mode.

[0013] In one embodiment, determining the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the vehicle's power demand includes: When the target operating mode is fixed-point power generation mode, obtain the vehicle speed calibration range and the power generation calibration table for fixed-point power generation mode; The target power output of the range extender is determined based on the current vehicle speed, the vehicle speed calibration range of the fixed-point power generation mode, and the power generation calibration table of the fixed-point power generation mode. When the target operating mode is power follower mode, obtain the power generation calibration table for power follower mode; Based on the required power of the vehicle and the current vehicle speed, the target power output of the range extender is determined from the power output calibration table of the power follower mode.

[0014] In addition, to achieve the above objectives, this application also proposes a control device for a hybrid electric vehicle, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the hybrid electric vehicle as described above.

[0015] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and which, when executed by a processor, implements the steps of the control method for a hybrid electric vehicle as described above.

[0016] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the control method for a hybrid electric vehicle as described above.

[0017] This application acquires the vehicle's current driving mode, current SOC, current vehicle speed, total vehicle power demand, and environmental information; determines the vehicle's target state based on the environmental information, current driving mode, and current SOC; determines the vehicle's range extender startup strategy based on the target state and current driving mode; controls the vehicle's range extender according to the range extender startup strategy; when the range extender's engine starts, determines the range extender's target operating mode and target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the total vehicle power demand; determines the range extender's target power generation speed based on the environmental information and the range extender's target power generation; and controls the engine using the range extender's target power generation speed. By adopting a technology that dynamically adjusts the range extender start-stop threshold based on environmental information and current SOC, and adaptively selects the range extender operating mode and power generation based on current vehicle speed and overall vehicle power demand, combined with precise control of power generation speed based on environmental information, the technical problems of low energy management efficiency and unstable operation caused by fixed threshold control in existing technologies are solved. This achieves precise matching between range extender start-stop control and power generation strategy under complex environmental conditions, improving the overall vehicle energy utilization efficiency and operational stability. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart illustrating an embodiment of the control method for a hybrid electric vehicle according to this application. Figure 2This is a schematic diagram of the module structure of the control device for a hybrid electric vehicle according to an embodiment of this application; Figure 3 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the control method of the hybrid electric vehicle in this application embodiment.

[0021] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0023] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0024] The main solution of this application embodiment is as follows: Acquire the vehicle's current driving mode, current SOC, current vehicle speed, total vehicle power demand, and environmental information; determine the vehicle's target state based on the environmental information, the current driving mode, and the current SOC; determine the vehicle's range extender startup strategy based on the target state and the current driving mode; control the vehicle's range extender according to the range extender startup strategy; when the range extender's engine starts, determine the range extender's target operating mode and the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the total vehicle power demand; determine the range extender's target power generation speed based on the environmental information and the range extender's target power generation; and control the engine using the range extender's target power generation speed.

[0025] In this embodiment, for ease of description, the vehicle-mounted system will be used as the execution subject in the following description.

[0026] Because existing range-extended hybrid electric vehicles typically use energy management strategies based on fixed battery charge thresholds to control the start-stop of the range extender, they lack dynamic adaptation to external conditions such as ambient temperature and atmospheric pressure. This strategy can easily lead to reduced battery pack charge and limited engine performance in low-temperature or high-altitude environments, resulting in a continuous decline in State of Charge (SOC) or frequent engine start-stop cycles, thus affecting overall vehicle energy efficiency and stability.

[0027] This application provides a solution that solves the technical problems of low energy management efficiency and unstable operation caused by fixed threshold control in existing technologies, which cannot adapt to environmental changes. By adopting a technical means that dynamically adjusts the start-stop threshold of the range extender based on environmental information and the current SOC, and adaptively selects the range extender operation mode and power generation power according to the current vehicle speed and the power demand of the whole vehicle, and combines environmental information to precisely control the power generation speed, this application solves the technical problems of low energy management efficiency and unstable operation caused by fixed threshold control in existing technologies. Compared with existing technologies, this application achieves precise matching of range extender start-stop control and power generation strategy under complex environmental conditions, thereby improving the energy utilization efficiency and operational stability of the whole vehicle.

[0028] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device or in-vehicle system capable of performing the above functions. The following description uses an in-vehicle system as an example to illustrate this embodiment and the subsequent embodiments.

[0029] Based on this, embodiments of this application provide a control method for a hybrid electric vehicle, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the control method for a hybrid electric vehicle according to this application.

[0030] In this embodiment, the control method for the hybrid electric vehicle includes steps S10 to S70: Step S10: Obtain the vehicle's current driving mode, current SOC, current vehicle speed, total vehicle power demand, and environmental information; It should be noted that the current driving mode refers to the power output mode selected by the user through the vehicle's infotainment system, including EV (Electric Vehicle) mode, HEV (Hybrid Electric Vehicle) mode, or EVMAX (Electric Vehicle Maximization / Maximum Electric Driving) mode; the current SOC refers to the real-time state of charge of the battery pack, reflecting its remaining percentage of charge; the current vehicle speed refers to the actual driving speed of the vehicle; the total power required to meet the driver's power request and the load of onboard accessories refers to the total power required to meet the driver's power request and the load of onboard accessories, which may include the driver's power request, air conditioning power, PTC (Positive Temperature Coefficient) power, and DCDC (Direct Current to Direct Current Converter) power; environmental information includes ambient temperature and atmospheric pressure.

[0031] It is understandable that different driving modes correspond to different energy distribution strategies, and the actual energy demand of a vehicle is affected by the combined effects of SOC, vehicle speed, power demand and environmental conditions. Therefore, step S10 can comprehensively collect key parameters that affect energy management, avoid control deviations caused by decisions based on a single parameter, and thus improve the decision-making accuracy of the energy management system and the adaptability of the whole vehicle.

[0032] Step S20: Determine the target state of the vehicle based on the environmental information, the current driving mode, and the current SOC; It should be noted that the target state of the vehicle refers to a qualitative energy level determined based on the current state of charge (SOC) of the battery, taking into account environmental conditions and driving mode. This state is used to determine the core start-stop logic of the range extender, specifically including high SOC, medium-high SOC, medium SOC, low SOC, and very low SOC states.

[0033] It is understandable that, since the actual usable capacity and performance of the battery are significantly affected by ambient temperature and atmospheric pressure, a fixed SOC threshold cannot make optimal decisions in all environments. Therefore, performing step S20 can avoid problems such as battery over-discharge, frequent engine start-stop, or power limitation caused by threshold mismatch in low temperature or high altitude environments, thereby improving the environmental adaptability and control robustness of the energy management strategy.

[0034] In one feasible implementation, step S20 may include: obtaining a SOC calibration value based on the current driving mode; obtaining the current ambient temperature and current atmospheric pressure based on the environmental information; querying a preset offset table based on the current ambient temperature and current atmospheric pressure to obtain the corresponding offset value; adjusting the SOC calibration value based on the offset value to obtain a target SOC calibration value; and determining the target state of the vehicle based on the current driving mode and the target SOC calibration value.

[0035] It should be noted that the current ambient temperature refers to the real-time temperature of the vehicle's external environment, and the current atmospheric pressure refers to the real-time air pressure at the vehicle's location.

[0036] The SOC calibration value contains multiple calibration values and is used to define the target states of the vehicle. The preset offset table is a pre-calibrated three-dimensional data table. Its abscissa is the ambient temperature, the ordinate is the atmospheric pressure, and the Z coordinate (output value) is the SOC offset value. This three-dimensional data table defines the values for compensating the SOC threshold under different environmental conditions. The offset value is a compensation amount obtained from the preset offset table according to the current ambient temperature and atmospheric pressure. This value is positive, indicating that in harsh environments (such as low temperature and high altitude), the range extender needs to be triggered earlier (at a higher SOC). The target SOC calibration value can be adjusted according to the offset value. For example, target SOC calibration value = SOC calibration value + offset value.

[0037] Further, taking the EV mode as an example, the EV mode SOC calibration value contains four values: SOC_EV_High_C, SOC_EV_MidHigh_C, SOC_EV_Mid_C, and SOC_EV_Low_C. According to the SOC, the vehicle is divided into the following states: ① When SOC ≥ SOC_EV_High_C: The vehicle is in a high SOC state.

[0038] ② When SOC_EV_MidHigh_C ≤ SOC < SOC_EV_High_C: The vehicle is in a mid-high SOC state.

[0039] ③ When SOC_EV_Mid_C ≤ SOC < SOC_EV_MidHigh_C: The vehicle is in a mid SOC state.

[0040] ④ When SOC_EV_Low_C ≤ SOC < SOC_EV_Mid_C: The vehicle is in a low SOC state.

[0041] ⑤ When SOC < SOC_EV_Low_C: The vehicle is in an extremely low SOC state.

[0042] The preset offset table for the EV mode, SOC_EV_Offset_MAP: The abscissa is the ambient temperature Ambient_Temp (unit: °C), the ordinate is the atmospheric pressure Ambient_Pressure (unit: kpa), and the Z coordinate is the SOC offset value, as follows:

[0043] The reference setting values are as follows:

[0044] When the HCU (Hybrid Control Unit, vehicle controller) detects that the vehicle is in a low-temperature or high-altitude environment, it will look up the corresponding SOC offset value according to the SOC_EV_Offset_MAP. When dividing the vehicle state, it will add the corresponding SOC offset value to SOC_EV_High_C, SOC_EV_MidHigh_C, SOC_EV_Mid_C, and SOC_EV_Low_C.

[0045] Among them, SOC_EV_High_C, SOC_EV_MidHigh_C, SOC_EV_Mid_C, SOC_EV_Low_C, and SOC_EV_Offset_MAP are all calibration values, which can be set according to the requirements of the vehicle manufacturer. The recommended settings are as follows:

[0046] Furthermore, taking the HEV mode as an example, the SOC calibration values in the HEV mode include four values: SOC_HEV_High_C, SOC_HEV_MidHigh_C, SOC_HEV_Mid_C, and SOC_HEV_Low_C. According to the SOC, the vehicle is divided into the following states: ① When SOC ≥ SOC_HEV_High_C: The vehicle is in a high SOC state.

[0047] ② When SOC_HEV_MidHigh_C ≤ SOC < SOC_HEV_High_C: The vehicle is in a mid-high SOC state.

[0048] [[ID=1,6]]③ When SOC_HEV_Mid_C ≤ SOC < SOC_HEV_MidHigh_C: The vehicle is in a mid SOC state.

[0049] ④ When SOC_HEV_Low_C ≤ SOC < SOC_HEV_Mid_C: The vehicle is in a low SOC state.

[0050] ⑤ When SOC < SOC_HEV_Low_C: The vehicle is in an extremely low SOC state. [[ID=,24]]

[0051] The preset offset table SOC_HEV_Offset_MAP for the HEV mode: The abscissa is the ambient temperature Ambient_Temp (unit: °C), the ordinate is the ambient pressure Ambient_Pressure (unit: kPa), and the Z coordinate is the SOC offset value, as follows:

[0052] The reference setting values are as follows:

[0053] When the HCU detects that the vehicle is in a low-temperature or high-altitude environment, it will look up the corresponding SOC offset value according to the SOC_EV_Offset_MAP. When dividing the vehicle state, the SOC values of SOC_HEV_High_C, SOC_HEV_MidHigh_C, SOC_HEV_Mid_C, and SOC_HEV_Low_C will be added with the corresponding SOC offset values.

[0054] Among them, SOC_HEV_High_C, SOC_HEV_MidHigh_C, SOC_HEV_Mid_C, SOC_HEV_Low_C, and SOC_HEV_Offset_MAP are all calibrated values, which can be set according to the requirements of the vehicle manufacturer. The recommended settings are as follows:

[0055] Further, taking the EVMAX mode as an example, the SOC calibration values in the EVMAX mode include four values: SOC_EVMAX_High_C, SOC_EVMAX_MidHigh_C, SOC_EVMAX_Mid_C, and SOC_EVMAX_Low_C. According to the SOC, the vehicle is divided into the following states: ① When SOC≥SOC_EVMAX_High_C: The vehicle is in a high SOC state.

[0056] ② When SOC_EVMAX_MidHigh_C≤SOC<SOC_EVMAX_High_C: The vehicle is in a mid-high SOC state.

[0057] ③ When SOC_EVMAX_Mid_C≤SOC<SOC_EVMAX_MidHigh_C: The vehicle is in a mid SOC state.

[0058] ④ When SOC_EVMAX_Low_C≤SOC<SOC_EVMAX_Mid_C: The vehicle is in a low SOC state.

[0059] ⑤ When SOC<SOC_EVMAX_Low_C: The vehicle is in a very low SOC state.

[0060] The preset offset table SOC_EVMAX_Offset_MAP for the EVMAX mode: The abscissa is the ambient temperature Ambient_Temp (unit: °C), the ordinate is the ambient pressure Ambient_Pressure (unit: kpa), and the Z coordinate is the SOC offset value, as follows:

[0061] The reference settings are as follows:

[0062] When the HCU detects that the vehicle is in a low temperature or high altitude environment, it will look up the corresponding SOC offset value according to the SOC_EV_Offset_MAP table. When classifying the vehicle state, it will add the corresponding SOC offset value to SOC_EVMAX_High_C, SOC_EVMAX_MidHigh_C, SOC_EVMAX_Mid_C, and SOC_EVMAX_Low_C.

[0063] Among them, SOC_EVMAX_High_C, SOC_EVMAX_MidHigh_C, SOC_EVMAX_Mid_C, SOC_EVMAX_Low_C, and SOC_EVMAX_Offset_MAP are all calibrated values ​​and can be set according to the OEM's requirements. The following settings are recommended:

[0064] In this embodiment, by introducing environmental factors to dynamically calibrate the SOC, the physical "current SOC" is transformed into the "target SOC" of the strategy, which solves the core problem that the fixed SOC threshold control strategy cannot adapt to complex environmental changes and realizes the environmental adaptive optimization of the energy management strategy.

[0065] The above are merely feasible implementations of step S20 provided in this embodiment. This embodiment does not specifically limit the specific implementation of step S20.

[0066] Step S30: Determine the vehicle's range extender activation strategy based on the target state and the current driving mode; It should be noted that the vehicle's range extender start-up strategy refers to a predefined set of rules, based on the target state determined in step S20, used to control whether and under what conditions the range extender engine starts. This strategy maps different target states to differentiated engine start-stop logic.

[0067] Understandably, since different target states reflect the vehicle's comprehensive energy demand level after energy reserve (SOC) and environmental adaptability calibration, a single or fixed starting condition cannot achieve the best balance of economy, power and power retention in all states. Therefore, performing step S30 can avoid unnecessary fuel consumption in the high power state, or battery over-discharge or power interruption caused by untimely starting in the low power state, thereby improving the precision of vehicle energy utilization and driving reliability.

[0068] In one feasible implementation, step S30 may include: when the current driving mode is pure electric mode or hybrid mode and the target state is a first target state, determining that the vehicle's range extender starting strategy is that the vehicle's engine does not start; when the current driving mode is pure electric mode or hybrid mode and the target state is a second target state, determining that the vehicle's range extender starting strategy is that the vehicle's engine starts according to the current vehicle speed and the vehicle's required power; when the current driving mode is pure electric mode or hybrid mode and the target state is a third target state, determining that the vehicle's range extender starting strategy is that the vehicle's engine remains running, wherein the vehicle's SOC corresponding to the first target state is greater than the vehicle's SOC corresponding to the second target state, and the vehicle's SOC corresponding to the second target state is greater than the vehicle's SOC corresponding to the third target state.

[0069] It should be noted that when the current driving mode is pure electric mode or hybrid mode, the first target state includes high SOC state and medium-high SOC state, the second target state includes medium SOC state and low SOC state, and the third target state includes very low SOC state.

[0070] The target states for EV mode and HEV mode are divided as follows: ① When the vehicle is in a high SOC state, the engine will not start.

[0071] ② When the vehicle is in a medium to high SOC state, the engine will not start.

[0072] ③ When the vehicle is in a state of partial SOC, the engine starts according to the conditions.

[0073] ④ When the vehicle is in a low SOC state, the engine starts according to the conditions.

[0074] ⑤ When the vehicle is in a very low SOC state, the engine is always running.

[0075] When the current driving mode is the pure electric range maximization mode, the first target state includes high SOC state, medium-high SOC state, medium SOC state and low SOC state; the third target state includes extremely low SOC state.

[0076] The target state of EVMAX mode is divided as follows: ① When the vehicle is in a high SOC state, the engine will not start.

[0077] ② When the vehicle is in a medium to high SOC state, the engine will not start.

[0078] ③ When the vehicle is in a state of partial SOC (State of Charge), the engine will not start.

[0079] ④ When the vehicle is in a low SOC state, the engine will not start.

[0080] ⑤ When the vehicle is in a very low SOC state, the engine is always running.

[0081] Furthermore, when the vehicle's target state is the third target state, after determining that the vehicle's range extender start strategy is to keep the vehicle's engine running, the shutdown SOC calibration value is obtained. When the SOC value is greater than or equal to the shutdown SOC calibration value, the vehicle's range extender is controlled to shut down.

[0082] It should be noted that the shutdown SOC calibration value is the value used when the vehicle's target state is an extremely low SOC state, causing the range extender's engine to shut down. The shutdown SOC calibration value is the sum of the offset value and the shutdown calibration value.

[0083] The recommended setting for the stop calibration value SOC_EngOff_ExtremelyLowSOC_EV_C in EV mode is 12%.

[0084] The recommended setting for the stop calibration value SOC_EngOff_ExtremelyLowSOC_HEV_C in HEV mode is 16%.

[0085] The recommended setting for the stop calibration value SOC_EngOff_ExtremelyLowSOC_EVMAX_C in EVMAX mode is 11%.

[0086] In this embodiment, by precisely associating the energy state (target state) with graded and differentiated start-up conditions, the technical problems of extensive energy management and inability to balance economy and power supply requirements caused by single or broad start-up conditions in the prior art are solved. This achieves the goal of maximizing pure electric driving range and fuel economy while ensuring the power baseline.

[0087] The above are merely feasible implementations of step S30 provided in this embodiment. This embodiment does not specifically limit the specific implementation of step S30.

[0088] Step S40: Control the range extender of the vehicle according to the range extender start-up strategy; It is understandable that since the start-up strategy determined in step S30 is only a decision-making logic, the physical control of the range extender can only be achieved through specific execution actions. Therefore, performing step S40 can avoid the problem of the control strategy and execution being disconnected, which would prevent energy management decisions from being implemented. This improves the effectiveness of strategy execution and the real-time performance of vehicle control.

[0089] In one feasible implementation, step S40 may include: when the vehicle's range extender start-up strategy is to start the vehicle's engine according to the current vehicle speed and the vehicle's required power, acquiring start-up control conditions and shutdown control conditions; when the current vehicle speed and / or the vehicle's required power meets the start-up control conditions, controlling the vehicle's range extender to start; and when the current vehicle speed or the current SOC value meets the shutdown control conditions, controlling the vehicle's range extender to shut down.

[0090] It should be noted that the start-up control conditions refer to the vehicle speed and power thresholds required to allow the range extender engine to start, while the stop-up control conditions refer to the vehicle speed or SOC threshold required to trigger the range extender engine to stop running.

[0091] When the vehicle's range extender start-up strategy is to start the vehicle's engine based on the current vehicle speed and the vehicle's required power, the corresponding vehicle target state can be a medium SOC state or a medium-low SOC state.

[0092] The start-up control conditions for the SOC state in EV mode are: The engine starts when the vehicle speed (VehicleSpeed) is greater than or equal to V_EngOn_MidSOC_EV_C and the vehicle request power (VehicleRequestPower) is greater than or equal to P_EngOn_MidSOC_EV_C.

[0093] Shutdown control conditions in EV mode with SOC status: The engine stops when the vehicle speed (VehicleSpeed) is less than or equal to V_EngOff_MidSOC_EV_C, or when the vehicle speed (SOC) is greater than or equal to SOC_EngOff_MidSOC_EV_C + SOC_EV_Offset_MAP.

[0094] V_EngOn_MidSOC_EV_C, P_EngOn_MidSOC_EV_C, V_EngOff_MidSOC_EV_C, and SOC_EngOff_MidSOC_EV_C are all calibrated values. OEMs can set them as needed. Recommended values ​​are as follows:

[0095] The start-up control conditions for the low SOC state in EV mode are: The engine starts when the vehicle speed (VehicleSpeed) is greater than or equal to (V_EngOn_LowSOC_EV_C).

[0096] Shutdown control conditions for low SOC state in EV mode: When SOC ≥ SOC_EngOff_LowSOC_EV_C + SOC_EV_Offset_MAP, the engine shuts down.

[0097] V_EngOn_LowSOC_EV_C and SOC_EngOff_LowSOC_EV_C are both calibrated values. OEMs can set them as needed. Recommended values ​​are as follows:

[0098] The start-up control conditions for the SOC state in HEV mode are: The engine starts when the vehicle speed (VehicleSpeed) is greater than or equal to V_EngOn_MidSOC_HEV_C and the vehicle request power (VehicleRequestPower) is greater than or equal to P_EngOn_MidSOC_HEV_C.

[0099] Shutdown control conditions in HEV mode during SOC state: The engine stops when the vehicle speed is less than or equal to V_EngOff_MidSOC_HEV_C, or when SOC is greater than or equal to SOC_EngOff_MidSOC_HEV_C + SOC_HEV_Offset_MAP.

[0100] V_EngOn_MidSOC_HEV_C, P_EngOn_MidSOC_HEV_C, V_EngOff_MidSOC_HEV_C, and SOC_EngOff_MidSOC_HEV_C are all calibrated values. OEMs can set them as needed. Recommended values ​​are as follows:

[0101] The start-up control conditions for low SOC state in HEV mode are as follows: The engine starts when the vehicle speed (VehicleSpeed) is greater than or equal to (V_EngOn_LowSOC_HEV_C).

[0102] Shutdown control conditions for low SOC state in HEV mode: When SOC ≥ SOC_EngOff_LowSOC_HEV_C + SOC_HEV_Offset_MAP, the engine shuts down.

[0103] V_EngOn_LowSOC_HEV_C and SOC_EngOff_LowSOC_HEV_C are both calibrated values. OEMs can set them as needed. Recommended values ​​are as follows:

[0104] In this embodiment, by transforming the abstract startup strategy into executable control logic based on explicit physical parameters (vehicle speed, power, SOC), the gap between the strategy layer and the execution layer is bridged, ensuring the accurate realization of energy management intentions.

[0105] The above are merely feasible implementations of step S40 provided in this embodiment. This embodiment does not specifically limit the specific implementation of step S40.

[0106] Step S50: When the engine of the range extender starts, the target operating mode of the range extender and the target power generation of the range extender in the target operating mode are determined according to the current vehicle speed and / or the vehicle power demand. It should be noted that the target operating modes of the range extender include fixed-point power generation mode and power-following mode. Fixed-point power generation mode refers to a working mode in which the range extender engine operates at a preset constant speed and constant power within a specific vehicle speed range; this is also the default operating mode of the range extender. Power-following mode refers to a working mode in which the range extender's power generation is dynamically adjusted according to the real-time power demand of the vehicle. The target power generation of the range extender refers to the real-time target electrical power output value required by the range extender system, obtained by looking up a table or calculation based on the selected target operating mode.

[0107] Understandably, since vehicles have different priorities for power, economy and power reserve under different operating conditions, a single fixed power generation strategy cannot achieve optimal system efficiency in all scenarios. Therefore, performing step S50 can avoid the continuous decline of SOC due to insufficient power generation under high demand conditions, or the fuel waste and NVH deterioration due to excessive power generation under low demand conditions, thereby improving the energy utilization efficiency and dynamic adaptability of the vehicle under different driving conditions.

[0108] In one feasible implementation, step S50 may include: acquiring a power-following mode vehicle speed calibration value, a power-following mode power calibration value, and the available output power of the battery pack; determining that the target operating mode of the range extender is a power-following mode when the current vehicle speed is greater than or equal to the power-following mode vehicle speed calibration value and the vehicle's required power is greater than or equal to the power-following mode power calibration value; determining that the target operating mode of the range extender is a power-following mode when the vehicle's required power is greater than or equal to the available output power of the battery pack; and determining the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the vehicle's required power.

[0109] It should be noted that the speed calibration value for power-following mode is a preset speed threshold. When the actual vehicle speed exceeds this value, it is considered that the vehicle has entered a high-speed operating condition, which is one of the conditions for triggering power-following mode. The power calibration value for power-following mode is a preset power threshold. When the power demand of the entire vehicle exceeds this value, it is considered that the vehicle has entered a high-load operating condition, which is another condition for triggering power-following mode. The usable output power of the battery pack refers to the maximum discharge power that the battery can safely provide at the current moment, calculated by the battery management system based on the current state of the battery (such as SOC, temperature, and SOH).

[0110] The two scenarios in which the range extender in EV mode switches from stationary power generation mode to power follower mode are as follows: ① When the vehicle speed (VehicleSpeed) ≥ V_InFollowMode_EV_C and the vehicle request power (VehicleRequestPower) ≥ P_InFollowMode_EV_C, the vehicle enters power follow mode. The recommended settings for the power follow mode vehicle speed calibration value (V_InFollowMode_EV_C) and the power follow mode power calibration value (P_InFollowMode_EV_C) in EV mode are as follows:

[0111] ② When the vehicle's required power (VehicleRequestPower) is greater than the battery pack's available output power (BMS_AvailableOutputPower), the system enters power follow mode.

[0112] The two scenarios in which the range extender switches from fixed-point power generation mode to power follower mode in HEV mode are as follows: ① When the vehicle speed (VehicleSpeed) ≥ V_InFollowMode_HEV_C and the vehicle request power (VehicleRequestPower) ≥ P_InFollowMode_HEV_C, the vehicle enters power follow mode. The recommended settings for the power follow mode vehicle speed calibration value (V_InFollowMode_HEV_C) and the power follow mode power calibration value (P_InFollowMode_HEV_C) in HEV mode are as follows:

[0113] ② When the vehicle's required power (VehicleRequestPower) is greater than the battery pack's available output power (BMS_AvailableOutputPower), the system enters power follow mode.

[0114] The two scenarios in which the range extender switches from stationary generation mode to power follower mode in EVMAX mode are as follows: ① When the vehicle speed (VehicleSpeed) ≥ V_InFollowMode_EVMAX_C and the vehicle request power (VehicleRequestPower) ≥ P_InFollowMode_EVMAX_C, the vehicle enters power follow mode. The recommended settings for the power follow mode vehicle speed calibration value (V_InFollowMode_EVMAX_C) and the power follow mode power calibration value (P_InFollowMode_EVMAX_C) in EVMAX mode are as follows:

[0115] ② When the vehicle's required power (VehicleRequestPower) is greater than the battery pack's available output power (BMS_AvailableOutputPower), the system enters power follow mode.

[0116] Specifically, determining the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the vehicle's required power includes: when the target operating mode is a fixed-point power generation mode, obtaining a fixed-point power generation mode speed calibration range and a fixed-point power generation mode power generation calibration table; determining the target power generation of the range extender based on the current vehicle speed, the fixed-point power generation mode speed calibration range, and the fixed-point power generation mode power generation calibration table; when the target operating mode is a power-following mode, obtaining a power-following mode power generation calibration table; and determining the target power generation of the range extender from the power-following mode power generation calibration table based on the vehicle's required power and the current vehicle speed.

[0117] It should be noted that the speed calibration intervals in the fixed-point power generation mode are a series of pre-defined speed ranges. Each speed range corresponds to a preset power generation capacity. The power generation capacity calibration table for the fixed-point power generation mode is a table that defines the mapping relationship between different speed ranges and fixed power generation capacities. The system directly looks up the corresponding target power generation capacity based on the range the current vehicle speed falls into. The power generation capacity calibration table for the power following mode is a two-dimensional map, where the horizontal axis is usually the vehicle's required power, the vertical axis is usually the vehicle speed, and the output value (Z-coordinate) is the target power generation capacity. This map defines the target power generation capacity required to maintain SOC stability under different combinations of required power and vehicle speed.

[0118] The power generation capacity of EV mode's fixed-point power generation is determined according to the following steps: ① When the vehicle speed VehicleSpeed < V_FixedPoint_Part1_EV_C, the target power generation power of the range extender is P_FixedPoint_Part0_EV_C.

[0119] ② When V_FixedPoint_Part1_EV_C ≤ VehicleSpeed < V_FixedPoint_Part2_EV_C, the target power generation power of the range extender is P_FixedPoint_Part1_EV_C.

[0120] ③ When V_FixedPoint_Part2_EV_C ≤ VehicleSpeed < V_FixedPoint_Part3_EV_C, the target power generation power of the range extender is P_FixedPoint_Part2_EV_C.

[0121] ④ When V_FixedPoint_Part3_EV_C ≤ VehicleSpeed < V_FixedPoint_Part4_EV_C, the target power generation power of the range extender is P_FixedPoint_Part3_EV_C.

[0122] ⑤ When V_FixedPoint_Part4_EV_C ≤ VehicleSpeed < V_FixedPoint_Part5_EV_C, the target power generation power of the range extender is P_FixedPoint_Part4_EV_C.

[0123] ⑥ When V_FixedPoint_Part5_EV_C ≤ VehicleSpeed < V_FixedPoint_Part6_EV_C, the target power generation power of the range extender is P_FixedPoint_Part5_EV_C.

[0124] ⑦ When V_FixedPoint_Part6_EV_C ≤ VehicleSpeed < V_FixedPoint_Part7_EV_C, the target power generation power of the range extender is P_FixedPoint_Part6_EV_C.

[0125] ⑧ When VehicleSpeed ≥ V_FixedPoint_Part7_EV_C, the target power generation power of the range extender is P_FixedPoint_Part7_EV_C.

[0126] The above calibration values can be set according to the requirements of the vehicle manufacturer, but it is necessary to consider the optimal operating economic range of the engine and NVH (Noise, Vibration and Harshness).

[0127] The vehicle speed calibration range for the fixed-point power generation mode in the EV mode is as follows:

[0128] The power generation power calibration table for the fixed-point power generation mode in the EV mode is as follows:

[0129] For the power generation power calibration table P_Follow_EV_MAP in the power following mode of the EV mode, the X coordinate is the vehicle demand power VehicleRequestPower, the Y coordinate is the vehicle speed VehicleSpeed, and the Z coordinate is the power generation power of power following. The reference setting values are as follows:

[0130] The power generation power of the fixed-point power generation in the HEV mode is determined according to the following steps: ① When the vehicle speed VehicleSpeed < V_FixedPoint_Part1_HEV_C, the target power generation power of the range extender is P_FixedPoint_Part0_HEV_C.

[0131] ② When V_FixedPoint_Part1_HEV_C ≤ VehicleSpeed < V_FixedPoint_Part2_HEV_C, the target power generation power of the range extender is P_FixedPoint_Part1_HEV_C.

[0132] ③ When V_FixedPoint_Part2_HEV_C ≤ VehicleSpeed < V_FixedPoint_Part3_HEV_C, the target power generation power of the range extender is P_FixedPoint_Part2_HEV_C.

[0133] ④ When V_FixedPoint_Part3_HEV_C ≤ VehicleSpeed < V_FixedPoint_Part4_HEV_C, the target power generation power of the range extender is P_FixedPoint_Part3_HEV_C.

[0134] ⑤ When V_FixedPoint_Part4_HEV_C ≤ VehicleSpeed < V_FixedPoint_Part5_HEV_C, the target power generation of the range extender is P_FixedPoint_Part4_HEV_C.

[0135] ⑥ When V_FixedPoint_Part5_HEV_C ≤ VehicleSpeed < V_FixedPoint_Part6_HEV_C, the target power generation of the range extender is P_FixedPoint_Part5_HEV_C.

[0136] ⑦ When V_FixedPoint_Part6_HEV_C ≤ VehicleSpeed < V_FixedPoint_Part7_HEV_C, the target power generation of the range extender is P_FixedPoint_Part6_HEV_C.

[0137] ⑧ When VehicleSpeed ≥ V_FixedPoint_Part7_HEV_C, the target power generation of the range extender is P_FixedPoint_Part7_HEV_C.

[0138] The above calibration values can be set according to the requirements of the vehicle manufacturer, but need to be combined with the optimal operating economic range of the engine and NVH.

[0139] The vehicle speed calibration range of the fixed-point power generation mode in HEV mode is as follows:

[0140] The power generation power calibration table of the fixed-point power generation mode in HEV mode is as follows:

[0141] The power generation power calibration table P_Follow_ HEV_MAP of the power following mode in HEV mode, the X coordinate is the vehicle demand power VehicleRequestPower, the Y coordinate is the vehicle speed VehicleSpeed, and the Z coordinate is the power generation power of the power following. The reference setting values are as follows:

[0142] The power generation of the fixed-point power generation in EVMAX mode is determined according to the following steps: ① When VehicleSpeed < V_FixedPoint_Part1_EVMAX_C, the target power generation of the range extender is P_FixedPoint_Part0_EVMAX_C.

[0143] ② When V_FixedPoint_Part1_EVMAX_C ≤ VehicleSpeed < V_FixedPoint_Part2_EVMAX_C, the target power generation power of the range extender is P_FixedPoint_Part1_EVMAX_C.

[0144] ③ When V_FixedPoint_Part2_EVMAX_C ≤ VehicleSpeed < V_FixedPoint_Part3_EVMAX_C, the target power generation power of the range extender is P_FixedPoint_Part2_EVMAX_C.

[0145] ④ When V_FixedPoint_Part3_EVMAX_C ≤ VehicleSpeed < V_FixedPoint_Part4_EVMAX_C, the target power generation power of the range extender is P_FixedPoint_Part3_EVMAX_C.

[0146] ⑤ When V_FixedPoint_Part4_EVMAX_C ≤ VehicleSpeed < V_FixedPoint_Part5_EVMAX_C, the target power generation power of the range extender is P_FixedPoint_Part4_EVMAX_C.

[0147] ⑥ When V_FixedPoint_Part5_EVMAX_C ≤ VehicleSpeed < V_FixedPoint_Part6_EVMAX_C, the target power generation power of the range extender is P_FixedPoint_Part5_EVMAX_C.

[0148] ⑦ When V_FixedPoint_Part6_EVMAX_C ≤ VehicleSpeed < V_FixedPoint_Part7_EVMAX_C, the target power generation power of the range extender is P_FixedPoint_Part6_EVMAX_C.

[0149] ⑧ When VehicleSpeed ≥ V_FixedPoint_Part7_EVMAX_C, the target power generation power of the range extender is P_FixedPoint_Part7_EVMAX_C.

[0150] The above calibration values can be set according to the requirements of the vehicle manufacturer, but need to be combined with the optimal operating economic range of the engine and NVH.

[0151] The speed calibration range for the EVMAX mode's fixed-point power generation mode is shown below:

[0152] The power generation calibration table for the fixed-point power generation mode of EVMAX is shown below:

[0153] The EVMAX mode power follow mode generator power calibration table P_Follow_EVMAX_MAP shows the X-axis as VehicleRequestPower, the Y-axis as VehicleSpeed, and the Z-axis as the power follow mode generator power. Reference settings are shown below:

[0154] In this embodiment, by matching differentiated power setting strategies to different operating modes and introducing a precise lookup table method based on vehicle speed and required power, the problem of low system efficiency or insufficient power response caused by mismatch between power generation and real-time operating conditions is solved, and high-precision and high-efficiency matching between the range extender's power generation and the vehicle's actual needs is achieved.

[0155] The above are merely feasible implementations of step S50 provided in this embodiment. This embodiment does not specifically limit the specific implementation of step S50.

[0156] Step S60: Determine the target power generation speed of the range extender based on the environmental information and the target power generation of the range extender; It should be noted that the target power generation speed of the range extender refers to the optimal speed control target set for the engine in the range extender after comprehensively considering environmental factors, in order to achieve the target power generation of the range extender determined in step S50. This speed is a key parameter to ensure that the engine operates in the high-efficiency range while meeting the power output requirements under specific environments (such as high altitudes).

[0157] Specifically, the range extender generator speed calibration table is obtained, and the generator speed is queried from the range extender generator speed calibration table based on the atmospheric pressure of the environmental information and the target power generation of the range extender.

[0158] It should be noted that the range extender generator speed calibration table N_EnSpd_EV_MAP in EV mode, where X represents generator power, Y represents atmospheric pressure, and Z represents generator speed, has the following reference settings:

[0159] The range extender generator speed calibration table N_EnSpd_HEV_MAP in HEV mode, where X is generator power, Y is atmospheric pressure, and Z is generator speed, is shown below for reference settings:

[0160] The range extender generator speed calibration table N_EnSpd_EVMAX_MAP in EVMAX mode, where X is generator power, Y is atmospheric pressure, and Z is generator speed, is shown below for reference settings:

[0161] Understandably, since the engine's optimal efficiency range and maximum output capacity change with variations in power generation and ambient atmospheric pressure, a fixed power generation speed cannot achieve the optimal solution for efficiency and performance under all power and altitude conditions. Therefore, performing step S60 can prevent insufficient engine torque output due to thin air in high-altitude areas, thus avoiding the inability to reach the target power generation, or improper speed setting in plains areas causing the engine to deviate from its high-efficiency range. This improves the range extender system's operating efficiency, power guarantee capability, and fuel economy under all operating conditions.

[0162] Step S70: Control the engine by the target power generation speed of the range extender.

[0163] It is understandable that since the target power generation speed determined in step S60 is the optimal set value after calibration by environmental factors (such as atmospheric pressure), if this speed command cannot be executed accurately, the design goals of efficiency optimization and power guarantee in the previous steps will not be achieved. Therefore, step S70 can avoid the deviation between the actual engine operating speed and the target value, which would lead to a decrease in engine efficiency, deterioration of NVH, or insufficient power output in special environments such as high altitudes. This improves the control accuracy, dynamic response capability, and ultimate effectiveness of the range extender system's energy management.

[0164] This embodiment provides a control method for a hybrid electric vehicle, which acquires the vehicle's current driving mode, current state of charge (SOC), current vehicle speed, total vehicle power demand, and environmental information; determines the vehicle's target state based on the environmental information, current driving mode, and current SOC; determines a range extender startup strategy based on the target state and current driving mode; controls the vehicle's range extender according to the range extender startup strategy; when the range extender's engine starts, determines the target operating mode of the range extender and the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the total vehicle power demand; determines the target power generation speed of the range extender based on the environmental information and the target power generation speed of the range extender; and controls the engine based on the target power generation speed of the range extender. By employing a technology that dynamically adjusts the range extender start-stop threshold based on environmental information and current SOC, and adaptively selects the range extender operating mode and power generation based on current vehicle speed and overall vehicle power demand, combined with precise control of power generation speed based on environmental information, this technology solves the technical problems of low energy management efficiency and unstable operation caused by fixed threshold control failing to adapt to environmental changes in existing technologies. Compared with existing technologies, it achieves precise matching of range extender start-stop control and power generation strategy under complex environmental conditions, improving overall vehicle energy utilization efficiency and operational stability.

[0165] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the control method of the hybrid electric vehicle of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0166] This application also provides a control device for a hybrid electric vehicle; please refer to... Figure 2 The control device for the hybrid vehicle includes: Input module 10 is used to obtain the vehicle's current driving mode, current SOC, current vehicle speed, total vehicle power demand, and environmental information; The state determination module 20 is used to determine the target state of the vehicle based on the environmental information, the current driving mode, and the current SOC. The strategy selection module 30 is used to determine the vehicle's range extender activation strategy based on the target state and the current driving mode. The range extender control module 40 is used to control the range extender of the vehicle according to the range extender start-up strategy; The power module 50 is used to determine the target operating mode of the range extender and the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the vehicle power demand when the engine of the range extender is started. The speed module 60 is used to determine the target power generation speed of the range extender based on the environmental information and the target power generation power of the range extender. Output module 70 is used to control the engine based on the target generator speed of the range extender.

[0167] The hybrid electric vehicle control device provided in this application, employing the hybrid electric vehicle control method described in the above embodiments, can solve the technical problem of how to improve the energy utilization efficiency and operational stability of range-extended hybrid electric vehicles in complex environments. Compared with the prior art, the beneficial effects of the hybrid electric vehicle control device provided in this application are the same as those of the hybrid electric vehicle control method provided in the above embodiments, and other technical features in the hybrid electric vehicle control device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0168] The state determination module 20 is further configured to obtain the current ambient temperature and current atmospheric pressure based on the environmental information; query a preset offset table based on the current ambient temperature and current atmospheric pressure to obtain the corresponding offset value; adjust the current SOC based on the offset value to obtain the target SOC; and determine the target state of the vehicle based on the current driving mode and the target SOC.

[0169] The strategy selection module 30 is further configured to: determine that the vehicle's range extender starting strategy is not to start the vehicle's engine when the current driving mode is pure electric mode or hybrid mode and the target state is a first target state; determine that the vehicle's range extender starting strategy is to start the vehicle's engine according to the current vehicle speed and the vehicle's required power when the current driving mode is pure electric mode or hybrid mode and the target state is a second target state; and determine that the vehicle's range extender starting strategy is to keep the vehicle's engine running when the current driving mode is pure electric mode or hybrid mode and the target state is a third target state, wherein the vehicle's SOC corresponding to the first target state is greater than the vehicle's SOC corresponding to the second target state, and the vehicle's SOC corresponding to the second target state is greater than the vehicle's SOC corresponding to the third target state.

[0170] The range extender control module 40 is further configured to acquire a shutdown SOC calibration value when the vehicle's range extender start-up strategy is to keep the vehicle's engine running; and to control the vehicle's range extender to shut down when the SOC value is greater than or equal to the shutdown SOC calibration value.

[0171] The range extender control module 40 is further configured to: acquire start-up control conditions and stop-up control conditions when the vehicle's range extender start-up strategy is to start the vehicle's engine based on the current vehicle speed and the vehicle's required power; control the vehicle's range extender to start when the current vehicle speed and / or the vehicle's required power meet the start-up control conditions; and control the vehicle's range extender to stop when the current vehicle speed or the current SOC value meets the stop-up control conditions.

[0172] The power module 50 is further configured to acquire the power-following mode vehicle speed calibration value, the power-following mode power calibration value, and the available output power of the battery pack; when the current vehicle speed is greater than or equal to the power-following mode vehicle speed calibration value and the vehicle's required power is greater than or equal to the power-following mode power calibration value, determine that the target operating mode of the range extender is the power-following mode; when the vehicle's required power is greater than or equal to the available output power of the battery pack, determine that the target operating mode of the range extender is the power-following mode; and determine the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the vehicle's required power.

[0173] The power module 50 is further configured to: acquire a fixed-point power generation mode speed calibration range and a fixed-point power generation mode power generation calibration table when the target operating mode is a fixed-point power generation mode; determine the target power generation of the range extender based on the current vehicle speed, the fixed-point power generation mode speed calibration range, and the fixed-point power generation mode power generation calibration table; acquire a power following mode power generation calibration table when the target operating mode is a power following mode; and determine the target power generation of the range extender from the power following mode power generation calibration table based on the vehicle's required power and the current vehicle speed.

[0174] This application provides a control device for a hybrid electric vehicle, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, which are executed by the at least one processor to enable the at least one processor to perform the control method for the hybrid electric vehicle described in Embodiment 1 above.

[0175] The following is for reference. Figure 3This document illustrates a structural schematic diagram of a control device suitable for implementing the embodiments of this application for a hybrid electric vehicle. The control device for the hybrid electric vehicle in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 3 The control device of the hybrid vehicle shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0176] like Figure 3 As shown, the control device of a hybrid electric vehicle may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in ROM (Read Only Memory) 1002 or a program loaded from storage device 1003 into random access memory (RRAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the control device of the hybrid electric vehicle. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. The communication device 1009 allows the control equipment of the hybrid vehicle to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows the control equipment of a hybrid vehicle with various systems, it should be understood that it is not required to implement or possess all the systems shown. More or fewer systems may be implemented alternatively.

[0177] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0178] The hybrid electric vehicle control device provided in this application, employing the hybrid electric vehicle control method described in the above embodiments, can solve the technical problem of how to improve the energy utilization efficiency and operational stability of range-extended hybrid electric vehicles in complex environments. Compared with the prior art, the beneficial effects of the hybrid electric vehicle control device provided in this application are the same as those of the hybrid electric vehicle control method provided in the above embodiments, and other technical features in the hybrid electric vehicle control device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0179] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0180] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0181] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the control method of the hybrid electric vehicle in the above embodiments.

[0182] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0183] The aforementioned computer-readable storage medium may be included in the control equipment of the hybrid vehicle; or it may exist independently and not be installed in the control equipment of the hybrid vehicle.

[0184] The aforementioned computer-readable storage medium carries one or more programs that, when executed by the control device of a hybrid electric vehicle, cause the control device to: acquire the vehicle's current driving mode, current state of charge (SOC), current vehicle speed, total vehicle power demand, and environmental information; determine the target state of the vehicle based on the environmental information, the current driving mode, and the current SOC; determine the vehicle's range extender startup strategy based on the target state and the current driving mode; control the vehicle's range extender according to the range extender startup strategy; when the range extender's engine starts, determine the target operating mode of the range extender and the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the total vehicle power demand; determine the target power generation speed of the range extender based on the environmental information and the target power generation speed of the range extender; and control the engine using the target power generation speed of the range extender.

[0185] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0186] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0187] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0188] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the control method of the above-described hybrid electric vehicle, which can solve the technical problem of how to improve the energy utilization efficiency and operational stability of range-extended hybrid electric vehicles in complex environments. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the control method of the hybrid electric vehicle provided in the above embodiments, and will not be repeated here.

[0189] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method for a hybrid electric vehicle as described above.

[0190] The computer program product provided in this application can solve the technical problem of how to improve the energy utilization efficiency and operational stability of range-extended hybrid electric vehicles in complex environments. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the hybrid electric vehicle control method provided in the above embodiments, and will not be repeated here.

[0191] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A control method for a hybrid electric vehicle, characterized in that, The control method for the hybrid electric vehicle includes: Obtain the vehicle's current driving mode, current SOC, current vehicle speed, total vehicle power demand, and environmental information; The target state of the vehicle is determined based on the environmental information, the current driving mode, and the current SOC. The vehicle's range extender activation strategy is determined based on the target state and the current driving mode; The range extender of the vehicle is controlled according to the range extender start-up strategy; When the engine of the range extender starts, the target operating mode of the range extender and the target power generation of the range extender in the target operating mode are determined based on the current vehicle speed and / or the vehicle power demand. The target power generation speed of the range extender is determined based on the environmental information and the target power generation capacity of the range extender. The engine is controlled by the target power generation speed of the range extender.

2. The method as described in claim 1, characterized in that, Determining the target state of the vehicle based on the environmental information, the current driving mode, and the current SOC includes: Obtain the SOC calibration value based on the current driving mode; Based on the environmental information, the current ambient temperature and current atmospheric pressure are obtained; The corresponding offset value is obtained by querying a preset offset table based on the current ambient temperature and the current atmospheric pressure. The SOC calibration value is adjusted based on the offset value to obtain the target SOC calibration value; The target state of the vehicle is determined based on the current driving mode and the target SOC calibration value.

3. The method as described in claim 1, characterized in that, The step of determining the vehicle's range extender activation strategy based on the target state and the current driving mode includes: When the current driving mode is pure electric mode or hybrid mode and the target state is the first target state, the range extender starting strategy of the vehicle is determined to be that the vehicle's engine does not start. When the current driving mode is pure electric mode or hybrid mode and the target state is the second target state, the range extender starting strategy of the vehicle is determined to be that the vehicle's engine starts according to the current vehicle speed and the total vehicle power demand. When the current driving mode is pure electric mode or hybrid mode and the target state is the third target state, the range extender starting strategy of the vehicle is determined to keep the vehicle's engine running, wherein the vehicle SOC corresponding to the first target state is greater than the vehicle SOC corresponding to the second target state, and the vehicle SOC corresponding to the second target state is greater than the vehicle SOC corresponding to the third target state.

4. The method as described in claim 2, characterized in that, After determining that the vehicle's range extender starting strategy is to keep the vehicle's engine running when the target state is the third target state, the method further includes: When the vehicle's range extender start-up strategy is to keep the vehicle's engine running, the shutdown SOC calibration value is obtained; When the SOC value is greater than or equal to the shutdown SOC calibration value, the range extender of the vehicle is controlled to shut down.

5. The method as described in claim 1, characterized in that, The step of controlling the vehicle's range extender according to the range extender activation strategy includes: When the vehicle's range extender start-up strategy is to start the vehicle's engine based on the current vehicle speed and the vehicle's required power, start-up control conditions and shutdown control conditions are obtained. When the current vehicle speed and / or the required power of the vehicle meet the start-up control conditions, the range extender of the vehicle is controlled to start. When the current vehicle speed or the current SOC value meets the shutdown control condition, the range extender of the vehicle is controlled to shut down.

6. The method as described in claim 1, characterized in that, When the engine of the range extender starts, determining the target operating mode of the range extender and the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the vehicle's power demand includes: Obtain the vehicle speed calibration value in power follow mode, the power calibration value in power follow mode, and the available output power of the battery pack; If the current vehicle speed is greater than or equal to the power-following mode speed calibration value and the total vehicle power demand is greater than or equal to the power-following mode power calibration value, the target operating mode of the range extender is determined to be the power-following mode. When the required power of the vehicle is greater than or equal to the available output power of the battery pack, the target operating mode of the range extender is determined to be the power follower mode. Based on the current vehicle speed and / or the vehicle's required power, determine the target power generation of the range extender in the target operating mode.

7. The method as described in claim 6, characterized in that, Determining the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the vehicle's power demand includes: When the target operating mode is fixed-point power generation mode, obtain the vehicle speed calibration range and the power generation calibration table for fixed-point power generation mode; The target power output of the range extender is determined based on the current vehicle speed, the vehicle speed calibration range of the fixed-point power generation mode, and the power generation calibration table of the fixed-point power generation mode. When the target operating mode is power follower mode, obtain the power generation calibration table for power follower mode; Based on the required power of the vehicle and the current vehicle speed, the target power output of the range extender is determined from the power output calibration table of the power follower mode.

8. A control device for a hybrid electric vehicle, characterized in that, The device includes: The input module is used to obtain the vehicle's current driving mode, current SOC, current vehicle speed, total vehicle power demand, and environmental information. The state determination module is used to determine the target state of the vehicle based on the environmental information, the current driving mode, and the current SOC. The strategy selection module is used to determine the vehicle's range extender activation strategy based on the target state and the current driving mode. The range extender control module is used to control the range extender of the vehicle according to the range extender start-up strategy; A power module is used to determine the target operating mode of the range extender and the target power generation of the range extender in the target operating mode based on the current vehicle speed and / or the vehicle's power demand when the engine of the range extender is started. A speed module is used to determine the target power generation speed of the range extender based on the environmental information and the target power generation capacity of the range extender. The output module is used to control the engine based on the target generator speed of the range extender.

9. A control device for a hybrid electric vehicle, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for a hybrid electric vehicle as claimed in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the control method for a hybrid electric vehicle as described in any one of claims 1 to 7.

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