Method for determining engine operating point of hybrid vehicle and vehicle

Abstract

The present application discloses a method for determining the engine operating point of a hybrid vehicle and a vehicle, and belongs to the field of vehicle technology. Through the technical solution provided in the embodiment of the present application, the reference operating point of the engine of the target hybrid vehicle on the optimal fuel economy curve of the universal characteristic diagram is determined, and multiple reference operating points less than the threshold value are determined on the universal characteristic diagram using the reference operating point and the power mode of the target hybrid vehicle. Based on the power mode, a target operating point is selected from multiple reference operating points, and the target equivalent fuel consumption rate of the target operating point meets the preset conditions, thereby reducing the number of reference operating points used when determining the target operating point of the engine, and can also achieve the determination of the target operating point according to the different power modes of the hybrid vehicle, thereby improving the efficiency and accuracy of determining the target operating point.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and more specifically, to a method for determining an engine operating point of a hybrid vehicle and a vehicle in the field of vehicle technology. Background Art

[0002] Hybrid vehicles are gaining popularity due to their excellent fuel economy. Since hybrid vehicles have two power sources—an engine and a drive motor—how to distribute the torque output of the engine and the drive motor is the key to improving the fuel economy of hybrid vehicles.

[0003] In the related art, it is usually necessary to first determine the operating point of the engine and then reversely infer the operating point of the drive motor, so as to achieve the distribution of the output torque of the engine and the drive motor.

[0004] However, since hybrid vehicles have multiple power modes, how to determine the engine's operating point under different power modes is a hot topic of research. Summary of the Invention

[0005] The present application provides a method for determining the engine operating point of a hybrid vehicle and a vehicle, which can determine the engine operating point in different power modes. The technical solution is as follows:

[0006] In one aspect, a method for determining an engine operating point of a hybrid vehicle is provided, the method comprising:

[0007] Determining a reference operating point of an engine of a target hybrid vehicle on a universal characteristic map, wherein the reference operating point is located on an optimal fuel economy curve of the universal characteristic map;

[0008] determining, based on the reference operating point and the power mode of the target hybrid vehicle, a plurality of reference operating points on the universal characteristic map, the plurality of reference operating points including the reference operating point, the number of the reference operating points being less than or equal to a quantity threshold;

[0009] Based on the power mode of the target hybrid vehicle, a target operating point of the engine of the target hybrid vehicle is determined from the multiple reference operating points, where the target operating point is a reference operating point among the multiple reference operating points at which a target equivalent fuel consumption rate meets a preset condition.

[0010] In a possible implementation, determining a reference operating point of the engine of the target hybrid vehicle on a universal characteristic diagram includes:

[0011] determining a base engine speed of the engine based on a power mode of the target hybrid vehicle;

[0012] Based on the reference engine speed, the reference operating point is determined on the optimal fuel economy curve, and the engine speed corresponding to the reference operating point is the reference engine speed.

[0013] In one possible implementation, determining the reference engine speed of the engine based on the power mode of the target hybrid vehicle includes:

[0014] When the power mode is the series mode, determining a reference engine speed of the engine based on an accelerator pedal opening and a vehicle speed of the target hybrid vehicle;

[0015] When the power mode is the parallel mode, a reference engine speed of the engine is determined based on a current gear position of the target hybrid vehicle.

[0016] In a possible implementation, determining the plurality of reference operating points on the universal characteristic diagram based on the benchmark operating point and the power mode of the target hybrid vehicle includes:

[0017] Using an offset method corresponding to the power mode to control the reference operating point to be offset on the universal characteristic diagram, to obtain a plurality of offset operating points;

[0018] Filtering the plurality of offset operating points using a restricted area on the universal characteristic diagram to obtain a plurality of filtered operating points;

[0019] The reference operating point and the plurality of filtered operating points are limited in number based on the number threshold to obtain the plurality of reference operating points.

[0020] In a possible implementation, the offset method corresponding to the power mode is used to control the reference operating point to offset on the universal characteristic diagram to obtain multiple offset operating points, including:

[0021] When the power mode is the series mode, based on the engine speed or engine power corresponding to the reference operating point, controlling the reference operating point to be offset on the universal characteristic diagram to obtain the plurality of offset operating points;

[0022] When the power mode is the parallel mode, based on the required torque of the target hybrid vehicle and the reference drive motor torque, the reference operating point is controlled to be offset on the universal characteristic diagram to obtain the multiple offset operating points, and the reference drive motor torque is the difference between the required torque and the engine torque corresponding to the reference operating point.

[0023] In a possible implementation, when the power mode is the series mode, based on the engine speed or engine power corresponding to the reference operating point, controlling the reference operating point to be offset on the universal characteristic diagram to obtain the multiple offset operating points includes:

[0024] When the power mode is the series mode, the reference operating point is controlled to be offset on the universal characteristic diagram by an equal engine speed to obtain a plurality of offset operating points, wherein the engine speed corresponding to the plurality of offset operating points is the same as that of the reference operating point;

[0025] Alternatively, when the power mode is the series mode, the reference operating point is controlled to perform an equal engine power offset on the universal characteristic diagram to obtain multiple offset operating points, and the engine power corresponding to the multiple offset operating points is the same as that of the reference operating point.

[0026] In a possible implementation, when the power mode is the parallel mode, the reference operating point is controlled to be offset on the universal characteristic diagram based on the required torque of the target hybrid vehicle and the reference drive motor torque to obtain the multiple offset operating points, including:

[0027] When the power mode is the parallel mode, the reference drive motor torque is transformed multiple times with a preset torque variation to obtain multiple candidate drive motor torques;

[0028] subtracting the required torque from the plurality of candidate drive motor torques to obtain a plurality of candidate engine torques;

[0029] Based on the multiple candidate engine torques, the reference operating point is controlled to perform an equal engine speed offset on the universal characteristic diagram to obtain the multiple offset operating points. The engine speeds corresponding to the multiple offset operating points are the same as those of the reference operating points, and one offset operating point corresponds to one candidate engine torque.

[0030] In a possible implementation, filtering the multiple offset operating points using the restricted area on the universal characteristic diagram to obtain multiple filtered operating points includes:

[0031] The offset operating condition points that are not in the restricted area are deleted from the multiple offset operating condition points to obtain the multiple filtered operating condition points.

[0032] In one possible implementation, determining the target operating point of the engine of the target hybrid vehicle from the multiple reference operating points based on the power mode of the target hybrid vehicle includes:

[0033] determining a target equivalent fuel consumption rate corresponding to each of the reference operating points based on the power mode of the target hybrid vehicle;

[0034] The reference operating point with the lowest target equivalent fuel consumption rate among the multiple reference operating points is determined as the target operating point.

[0035] In a possible implementation, determining the target equivalent fuel consumption rate corresponding to each reference operating point based on the power mode of the target hybrid vehicle includes:

[0036] determining a battery equivalent fuel consumption rate corresponding to each of the reference operating points based on a power mode of the target hybrid vehicle;

[0037] Determining the fuel consumption rate corresponding to each reference operating point;

[0038] The battery equivalent fuel consumption rate and the fuel consumption rate corresponding to each of the reference operating points are added together to obtain the target equivalent fuel consumption rate corresponding to each of the reference operating points.

[0039] In a possible implementation, determining the battery equivalent fuel consumption rate corresponding to each reference operating point based on the power mode of the target hybrid vehicle includes:

[0040] When the power mode is the series mode, determining the battery equivalent fuel consumption rate corresponding to each of the reference operating points based on the required torque and the drive motor speed of the target hybrid vehicle;

[0041] When the power mode is the parallel mode, the drive motor torque corresponding to each reference operating point is determined based on the required torque of the target hybrid vehicle and the engine torque corresponding to each reference operating point; and the battery equivalent fuel consumption rate corresponding to each reference operating point is determined based on the drive motor torque and drive motor speed corresponding to each reference operating point.

[0042] In one aspect, a device for determining an engine operating point of a hybrid vehicle is provided, the device comprising:

[0043] a reference operating point determination module, configured to determine a reference operating point of the engine of the target hybrid vehicle on a universal characteristic map, wherein the reference operating point is located on an optimal fuel economy curve of the universal characteristic map;

[0044] a reference operating point determination module, configured to determine a plurality of reference operating points on the universal characteristic diagram based on the reference operating point and the power mode of the target hybrid vehicle, the plurality of reference operating points including the reference operating point, the number of the reference operating points being less than or equal to a number threshold;

[0045] a target operating point determination module, configured to determine, based on the power mode of the target hybrid vehicle, a target operating point of the engine of the target hybrid vehicle from the plurality of reference operating points, the target operating point being a reference operating point among the plurality of reference operating points at which a target equivalent fuel consumption rate meets a preset condition.

[0046] In one possible implementation, the reference operating point determination module is configured to determine a reference engine speed of the engine based on the power mode of the target hybrid vehicle; and based on the reference engine speed, determine the reference operating point on the optimal fuel economy curve, where the engine speed corresponding to the reference operating point is the reference engine speed.

[0047] In one possible implementation, the reference operating point determination module is configured to determine a reference engine speed of the engine based on an accelerator pedal opening and a vehicle speed of the target hybrid vehicle when the power mode is a series mode; and to determine a reference engine speed of the engine based on a current gear of the target hybrid vehicle when the power mode is a parallel mode.

[0048] In one possible embodiment, the reference operating point determination module is used to control the reference operating point to be offset on the universal characteristic diagram using the offset method corresponding to the power mode to obtain multiple offset operating points; use the restricted area on the universal characteristic diagram to filter the multiple offset operating points to obtain multiple filtered operating points; and limit the number of the reference operating point and the multiple filtered operating points based on the quantity threshold to obtain the multiple reference operating points.

[0049] In one possible implementation, the reference operating point determination module is configured to, when the power mode is a series mode, control the reference operating point to be offset on the universal characteristic diagram based on the engine speed or engine power corresponding to the reference operating point to obtain the multiple offset operating points; and, when the power mode is a parallel mode, control the reference operating point to be offset on the universal characteristic diagram based on the required torque of the target hybrid vehicle and the reference drive motor torque to obtain the multiple offset operating points, where the reference drive motor torque is the difference between the required torque and the engine torque corresponding to the reference operating point.

[0050] In one possible embodiment, the reference operating point determination module is used to control the reference operating point to be offset on the universal characteristic diagram at equal engine speed when the power mode is the series mode, to obtain multiple offset operating points, and the engine speed corresponding to the multiple offset operating points is the same as that of the reference operating point; or, when the power mode is the series mode, to control the reference operating point to be offset on the universal characteristic diagram at equal engine power to obtain multiple offset operating points, and the engine power corresponding to the multiple offset operating points is the same as that of the reference operating point.

[0051] In one possible embodiment, the reference operating point determination module is used to, when the power mode is a parallel mode, perform multiple transformations on the reference drive motor torque with a preset torque change amount to obtain multiple candidate drive motor torques; subtract the required torque from the multiple candidate drive motor torques to obtain multiple candidate engine torques; and control the reference operating point based on the multiple candidate engine torques to perform equal engine speed offset on the universal characteristic diagram to obtain the multiple offset operating points, the engine speeds corresponding to the multiple offset operating points are the same as those of the reference operating point, and one offset operating point corresponds to one candidate engine torque.

[0052] In a possible implementation, the reference operating point determination module is configured to delete the offset operating points that are not in the restricted area among the multiple offset operating points to obtain the multiple filtered operating points.

[0053] In one possible implementation, the target operating point determination module is configured to determine the target equivalent fuel consumption rate corresponding to each of the reference operating points based on the power mode of the target hybrid vehicle; and determine the reference operating point with the lowest target equivalent fuel consumption rate among the multiple reference operating points as the target operating point.

[0054] In one possible implementation, the target operating point determination module is configured to determine the battery equivalent fuel consumption rate corresponding to each of the reference operating points based on the power mode of the target hybrid vehicle; determine the fuel consumption rate corresponding to each of the reference operating points; and add the battery equivalent fuel consumption rate and the fuel consumption rate corresponding to each of the reference operating points to obtain the target equivalent fuel consumption rate corresponding to each of the reference operating points.

[0055] In one possible implementation, the target operating point determination module is configured to determine, when the power mode is a series mode, the battery equivalent fuel consumption rate corresponding to each of the reference operating points based on the required torque of the target hybrid vehicle and the drive motor speed; when the power mode is a parallel mode, determine, based on the required torque of the target hybrid vehicle and the engine torque corresponding to each of the reference operating points, the drive motor torque corresponding to each of the reference operating points; and determine, based on the drive motor torque and drive motor speed corresponding to each of the reference operating points.

[0056] On the one hand, a vehicle is provided, comprising one or more processors and one or more memories, wherein the one or more memories store at least one program code, and the program code is loaded and executed by the one or more processors to implement the operations performed by the method for determining the engine operating point of the hybrid vehicle.

[0057] On the one hand, a computer-readable storage medium is provided, wherein at least one program code is stored in the computer-readable storage medium, and the program code is loaded and executed by a processor to implement the operations performed by the method for determining the engine operating point of the hybrid vehicle.

[0058] Through the technical solutions provided in the embodiments of the present application, a reference operating point of the target hybrid vehicle's engine on the optimal fuel economy curve of a universal characteristic map is determined. A plurality of reference operating points, fewer than a threshold number, are determined on the universal characteristic map using the reference operating point and the target hybrid vehicle's power mode. Based on the power mode, a target operating point is selected from the plurality of reference operating points, where the target equivalent fuel consumption rate meets a preset condition. This reduces the number of reference operating points used in determining the target operating point of the engine, and enables determination of the target operating point based on the different power modes of the hybrid vehicle, thereby improving the efficiency and accuracy of determining the target operating point. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 is a schematic diagram of an implementation environment of a method for determining an engine operating point of a hybrid vehicle provided in an embodiment of the present application;

[0060] Figure 2 This is a flow chart of a method for determining an engine operating point of a hybrid vehicle provided in an embodiment of the present application;

[0061] Figure 3 is a flow chart of another method for determining an engine operating point of a hybrid vehicle provided in an embodiment of the present application;

[0062] Figure 4This is a schematic diagram of determining a reference operating point provided in an embodiment of the present application;

[0063] Figure 5 This is another schematic diagram for determining a reference operating point provided in an embodiment of the present application;

[0064] Figure 6 This is another schematic diagram of determining a reference operating point provided in an embodiment of the present application;

[0065] Figure 7 This is a schematic diagram of another method for determining a reference operating point provided in an embodiment of the present application;

[0066] Figure 8 is a schematic diagram of a restricted area provided in an embodiment of the present application;

[0067] Figure 9 This is a logic diagram of another method for determining an engine operating point of a hybrid vehicle provided in an embodiment of the present application;

[0068] Figure 10 1 is a schematic structural diagram of a device for determining an engine operating point of a hybrid vehicle provided in an embodiment of the present application;

[0069] Figure 11 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0070] The following will clearly and thoroughly describe the technical solutions in this application in conjunction with the accompanying drawings. In the description of the embodiments of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more than two.

[0071] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features reflected. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features.

[0072] In order to illustrate the technical solutions provided by the embodiments of the present application, some terms involved in the embodiments of the present application are first introduced.

[0073] Hybrid electric vehicles (HEVs) combine two power sources: an internal combustion engine and an electric motor. These two sources can intelligently switch or work together according to different driving conditions to improve fuel efficiency and reduce emissions. Hybrid electric vehicles are generally categorized as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and extended-range hybrid electric vehicles (EREVs).

[0074] Powertrain architecture: The powertrain architecture of a hybrid vehicle is one of the key factors in measuring its performance. Generally speaking, it includes P0-P4 architecture. The following is a detailed analysis of the P0-P4 architecture:

[0075] The P0 architecture's electric motor is located at the front of the engine, connected to the engine crankshaft via a belt. This configuration is commonly used in mild and micro-hybrid systems. The P0 motor's primary function is to boost engine speed and recover kinetic energy, thereby improving fuel economy.

[0076] The P1 motor is located behind the engine crankshaft and directly connected to the engine. Similar to the P0 motor, the P1 motor supports engine start-stop, brake energy regeneration, and auxiliary power output. Because it's directly connected to the engine, the P1 motor delivers more efficient power transmission, improved fuel economy, and significantly improved driving performance.

[0077] The P2 motor is located between the engine and the gearbox. The P2 motor provides higher efficiency because it can cooperate with the gearbox through a clutch or gears to achieve a balance between power and efficiency. The P2 layout is more flexible and can be located before or after the clutch, or between the dual clutches. The advantage of the P2 motor is that its architecture is mature, the manufacturing cost is economical, and it can drive the vehicle without an engine, which is more environmentally friendly. In the embodiments of the present application, the hybrid vehicle refers to a hybrid vehicle with a P2 architecture.

[0078] The P3 architecture's electric motor is located behind the transmission, coaxial with the engine. It directly drives the wheels, offering high pure electric drive efficiency and excellent kinetic energy recovery. Because the P3 architecture's electric motor can't be integrated with the transmission or engine, the entire structure requires a separate storage space, which in turn takes up more space within the vehicle.

[0079] The P4 architecture's electric motor is located on the axle, directly driving the wheels. The P4 motor architecture is often combined with other motors, such as the P0 or P1 motor, to achieve all-wheel drive and a flat center rear seat. The P4 motor can directly drive the vehicle without engine assistance and is typically placed on the rear axle.

[0080] Universal Characteristic Diagram: A universal characteristic diagram represents the characteristics of an internal combustion engine. It plots a family of contour curves for many key characteristic parameters, with speed as the horizontal axis and torque as the vertical axis. The universal characteristic diagram illustrates the changing relationships between key engine parameters across the entire operating range, helping to determine the engine's most economical operating range and the region where pollutant emissions are minimized. During engine parameter matching, ensuring that the optimal performance region falls within the most commonly used operating conditions is a key principle of engine performance matching.

[0081] Optimal fuel economy curve: refers to the line connecting the operating points where the engine can achieve the lowest fuel consumption rate under different operating conditions.

[0082] Operating point: The operating point refers to the operating state of the engine under specific operating conditions, usually including the engine speed and torque of the engine. The selection of the engine operating point has a significant impact on the engine's performance, fuel efficiency and emissions. Under different operating conditions, the engine's thermal efficiency, fuel consumption rate and emission characteristics will vary. Therefore, optimizing the engine operating point is crucial to improving the economy and environmental performance of the vehicle. In hybrid vehicles, the optimization of the engine's operating point is particularly important because it involves energy management and coordination between the engine, motor and battery. By adjusting the engine's operating point, torque decoupling can be achieved, optimizing the economy and power output of the vehicle. For example, the engine load can be increased by generating electricity through the motor, or the engine load can be reduced by assisting the motor, thereby improving the engine's operating efficiency and reducing fuel consumption.

[0083] Power mode: In the embodiment of the present application, it refers to the power source coupling method, for example, including series mode, parallel mode and pure electric mode.

[0084] Equivalent fuel consumption (EFC): A metric used to measure the fuel economy of a hybrid vehicle. It equates the electric energy consumed by the drive motor to fuel consumption, providing a more intuitive understanding of the vehicle's overall energy consumption. Calculating EFC typically involves converting fuel consumption and electrical energy consumption.

[0085] ECMS (Equivalent Fuel Consumption Minimization Strategy) is a commonly used energy management strategy in hybrid vehicles. Its core concept is to minimize the hybrid vehicle's equivalent fuel consumption by adjusting the operating conditions of the engine and drive motor in real time, thereby improving fuel economy. The ECMS strategy optimizes energy distribution by converting electrical energy consumption into equivalent fuel consumption using an equivalence factor.

[0086] In related technologies, finding the target operating point of a hybrid vehicle's engine usually relies on a large number of reference operating points (usually 20). The final target operating point is determined from these reference points. These large numbers of reference operating points place high demands on the computing power of the hybrid vehicle's HCU (Hybrid Control Unit). Furthermore, these large numbers of reference operating points can easily lead to logical calculation errors, resulting in the final target operating point being suboptimal.

[0087] The technical solutions provided in the embodiments of the present application can improve the problems in the above-mentioned related technologies.

[0088] After introducing some of the terms involved in the embodiments of the present application, the implementation environment of the embodiments of the present application is introduced below. Figure 1 The implementation environment of the method for determining the engine operating point of a hybrid vehicle provided in the embodiment of the present application includes a hybrid control unit 101 , an engine control unit 102 and a drive motor control unit 103 .

[0089] The hybrid control unit 101 is the brain of the hybrid power system of the hybrid vehicle. It controls key tasks such as power distribution, torque management, and fault diagnosis to ensure that the hybrid vehicle has good performance and safety in different power modes. The hybrid control unit 101 is electrically connected to the engine control unit 102 and the drive motor control unit 103. The hybrid control unit 101 can send engine control instructions to the engine control unit 102, thereby controlling the engine through the engine control unit 102. In an embodiment of the present application, the engine control instructions that the hybrid control unit 101 can send to the engine control unit 102 can carry a determined target operating point, so that the engine control unit 102 controls the engine to operate at the target operating point. Accordingly, the hybrid control unit 101 can send drive motor control instructions to the drive motor control unit 103, thereby controlling the drive motor through the drive motor control unit 103.

[0090] After introducing the implementation environment of the embodiments of the present application, the following describes the application scenarios of the technical solutions provided by the embodiments of the present application. The technical solutions provided by the embodiments of the present application can be applied to hybrid vehicles with a P2 architecture. By adopting the technical solutions provided by the embodiments of the present application, the number of reference operating points used when determining the target operating point of the engine can be reduced. At the same time, the target operating point can be determined according to the different power modes of the hybrid vehicle, thereby improving the efficiency of determining the target operating point while maintaining the accuracy of the target operating point.

[0091] After introducing the implementation environment and application scenarios of the embodiments of the present application, the technical solutions provided by the embodiments of the present application are introduced below. Figure 2 Taking the execution subject as a hybrid control unit as an example, the method includes the following steps.

[0092] 201. A hybrid control unit determines a reference operating point of an engine of a target hybrid vehicle on a universal characteristic map, where the reference operating point is located on an optimal fuel economy curve of the universal characteristic map.

[0093] Among them, the reference operating point is also called the economic operating point of the engine. The fuel economy corresponding to the reference operating point is higher. The reference operating point is not directly used to control the engine because the hybrid vehicle has two power systems. Ultimately, when determining the target equivalent fuel consumption rate, the fuel consumption rate of the engine and the equivalent fuel consumption rate of the power battery are combined. The engine's selection of different operating points will directly affect the working conditions of the drive motor, thereby affecting the equivalent fuel consumption rate of the power battery. Therefore, in the embodiment of the present application, the reference operating point cannot be directly used to control the engine. It is also necessary to further judge the engine's operating point in combination with the working conditions of the drive motor. The horizontal axis of the universal characteristic diagram represents the engine speed, and the vertical axis represents the engine torque. Accordingly, the horizontal coordinate of the operating point is the engine speed, and the vertical coordinate is the engine torque. The optimal fuel economy curve is obtained by fitting multiple economic operating points of the engine. The optimal fuel economy curve is calibrated by technical personnel based on the actual situation of the target hybrid vehicle. The embodiment of the present application does not limit this.

[0094] 202. The hybrid control unit determines a plurality of reference operating points on the universal characteristic diagram based on the reference operating point and the power mode of the target hybrid vehicle, where the plurality of reference operating points includes the reference operating point, and the number of the reference operating points is less than or equal to a quantity threshold.

[0095] Among them, the power mode includes series mode, parallel mode and pure electric mode. In series mode, the drive motor provides torque, and the engine drives the generator to generate electricity; in parallel mode, the drive motor and the engine jointly provide torque. In addition, in some special cases, the torque can also be provided by the engine alone. In this case, the parallel mode is also called direct drive mode. In pure electric mode, the drive motor provides torque, and the engine does not work. Multiple reference operating points are used to determine the target operating point of the engine. The number threshold is set by technical personnel according to actual conditions, and this embodiment of the application does not limit this.

[0096] 203. The hybrid control unit determines a target operating point of the engine of the target hybrid vehicle from the multiple reference operating points based on the power mode of the target hybrid vehicle, where the target operating point is a reference operating point among the multiple reference operating points at which the target equivalent fuel consumption rate meets a preset condition.

[0097] The target equivalent fuel consumption rate at the reference operating point refers to the sum of the fuel consumption rate corresponding to the reference operating point and the equivalent fuel consumption rate of the power battery. The preset conditions are set by technicians based on actual conditions and are not limited in this embodiment of the application.

[0098] Through the technical solutions provided in the embodiments of the present application, a reference operating point of the target hybrid vehicle's engine on the optimal fuel economy curve of a universal characteristic map is determined. A plurality of reference operating points, fewer than a threshold number, are determined on the universal characteristic map using the reference operating point and the target hybrid vehicle's power mode. Based on the power mode, a target operating point is selected from the plurality of reference operating points, where the target equivalent fuel consumption rate meets a preset condition. This reduces the number of reference operating points used in determining the target operating point of the engine, and enables determination of the target operating point based on the different power modes of the hybrid vehicle, thereby improving the efficiency and accuracy of determining the target operating point.

[0099] It should be noted that the above steps 201-203 are a brief description of the method for determining the engine operating point of the hybrid vehicle provided in the embodiment of the present application. The method for determining the engine operating point of the hybrid vehicle provided in the embodiment of the present application will be described in more detail below with reference to some examples. Figure 3 Taking the execution subject as a hybrid control unit as an example, the method includes the following steps.

[0100] 301. A hybrid control unit determines a reference engine speed of an engine of the target hybrid vehicle based on a power mode of the target hybrid vehicle.

[0101] Among them, the target hybrid vehicle is a hybrid vehicle with a P2 architecture. The power modes include series mode, parallel mode and pure electric mode. In series mode, the drive motor provides torque, and the engine drives the generator to generate electricity. In parallel mode, the drive motor and the engine jointly provide torque. In addition, in some special cases, the torque can also be provided by the engine alone. In this case, the parallel mode is also called direct drive mode. In pure electric mode, the drive motor provides torque, and the engine does not work. The reference engine speed is the engine speed corresponding to the current working conditions of the engine. The method of determining the reference engine speed is different in different power modes. It should be noted that in pure electric mode, since the engine is not working, there is no need to determine the reference engine speed.

[0102] In a possible implementation, when the power mode is the series mode, the hybrid control unit determines the reference engine speed of the engine based on the accelerator pedal opening and the vehicle speed of the target hybrid vehicle.

[0103] Here, the accelerator pedal opening is the current accelerator pedal opening of the target hybrid vehicle, and the vehicle speed is the current speed of the target hybrid vehicle. The accelerator pedal opening reflects the degree to which the accelerator pedal is depressed. A greater accelerator pedal opening indicates a stronger driver's desire to accelerate, and the target hybrid vehicle should provide greater torque. Correspondingly, a smaller accelerator pedal opening indicates a weaker driver's desire to accelerate, and the target hybrid vehicle should provide less torque. In series mode, the vehicle's torque is provided by the drive motor, which drives the generator. Increased torque provided by the drive motor causes the power battery charge to decrease at a faster rate, necessitating a corresponding increase in engine power generation to maintain the power battery charge within the set range. From the above analysis, it can be seen that while the accelerator pedal does not directly control the engine speed, due to the presence of the drive motor and power battery, it can indirectly control the engine speed. Therefore, the accelerator pedal opening is used to determine the engine's baseline engine speed. Furthermore, the required torque for the same accelerator pedal opening varies at different vehicle speeds. As described above, engine speed is also correlated with vehicle speed, so vehicle speed is also used when determining the engine's base engine speed. It should be noted that in series mode, since the drive motor provides all of the vehicle's torque, the drive motor speed and engine speed are decoupled and uncorrelated.

[0104] In this embodiment, when the power mode is the series mode, the accelerator pedal opening and the vehicle speed are used to determine the reference engine speed, and the reference engine speed closely matches the actual operating condition of the target hybrid vehicle.

[0105] In order to explain the above embodiment more clearly, the above embodiment is described below through two examples.

[0106] Example 1: When the power mode is the series mode, the hybrid control unit uses the accelerator pedal opening and the vehicle speed to query the first relationship table to obtain the reference engine speed of the engine.

[0107] Among them, the first relationship table stores the correspondence between the accelerator pedal opening, vehicle speed and reference engine speed. The first relationship table is configured by technicians according to actual conditions, and the embodiments of the present application do not limit this.

[0108] Example 2: When the power mode is series mode, the hybrid control unit inputs the accelerator pedal position and vehicle speed into a reference engine speed determination model. Using this reference engine speed determination model, the hybrid control unit extracts features from the accelerator pedal position and vehicle speed to obtain a reference engine speed determination feature. Using this reference engine speed determination model, the hybrid control unit fully connects and normalizes the reference engine speed determination feature to obtain the reference engine speed for the engine.

[0109] Among them, the benchmark engine speed determination model is a regression model, which is obtained by training based on multiple first sample data and the labeled benchmark engine speed corresponding to each first sample data. The first sample data includes a pair of sample accelerator pedal opening and sample vehicle speed.

[0110] Another implementation of the above step 301 is described below.

[0111] In a possible implementation manner, when the power mode is the parallel mode, the hybrid control unit determines the reference engine speed of the engine based on the current gear of the target hybrid vehicle.

[0112] In parallel mode, the vehicle's torque is provided by both the drive motor and the engine. The engine and drive motor need to be coupled, typically via a gearbox. This indicates a correlation between the engine speed and the motor speed, with this correlation being limited by the gear position of the gearbox. Therefore, the current gear position is utilized in determining the baseline engine speed. The gearbox is specifically designed for hybrid vehicles.

[0113] In this embodiment, when the power mode is the parallel mode, the current gear is used to determine the reference engine speed, and the reference engine speed is closely matched with the actual operating condition of the target hybrid vehicle.

[0114] For example, when the power mode is the parallel mode, the hybrid control unit uses the current gear to query the second relationship table to obtain the reference engine speed of the engine.

[0115] Among them, the second relationship table stores the correspondence between the gear position and the reference engine speed. The second relationship table is configured by technical personnel according to actual conditions, and the embodiment of the present application does not limit this.

[0116] 302. The hybrid control unit determines the reference operating point on the optimal fuel economy curve based on the reference engine speed, and the engine speed corresponding to the reference operating point is the reference engine speed.

[0117] Among them, the reference operating point is also called the economic operating point of the engine. The fuel economy corresponding to the reference operating point is higher. The reference operating point is not directly used to control the engine because the hybrid vehicle has two power systems. Ultimately, when determining the target equivalent fuel consumption rate, the fuel consumption rate of the engine and the equivalent fuel consumption rate of the power battery are combined. The engine's selection of different operating points will directly affect the working conditions of the drive motor, thereby affecting the equivalent fuel consumption rate of the power battery. Therefore, in the embodiment of the present application, the reference operating point cannot be directly used to control the engine. It is also necessary to further judge the engine's operating point in combination with the working conditions of the drive motor. The horizontal axis of the universal characteristic diagram represents the engine speed, and the vertical axis represents the engine torque. Accordingly, the horizontal coordinate of the operating point is the engine speed, and the vertical coordinate is the engine torque. The optimal fuel economy curve is obtained by fitting multiple economic operating points of the engine. The optimal fuel economy curve is calibrated by technical personnel based on the actual situation of the target hybrid vehicle. The embodiment of the present application does not limit this.

[0118] In a possible implementation, the hybrid control unit uses the reference engine speed to perform an operating point query on the optimal fuel economy curve to obtain the reference operating point.

[0119] The operating point query is to query the operating point whose horizontal coordinate is the reference engine speed on the optimal fuel economy curve, and the queried operating point is also the reference operating point.

[0120] For example, the hybrid control unit applies the baseline engine speed to the curve function corresponding to the optimal fuel economy curve to obtain a baseline engine torque. The hybrid control unit then determines the operating point on the optimal fuel economy curve with the baseline engine speed as the abscissa and the baseline engine torque as the ordinate as the baseline operating point.

[0121] The curve function is a function obtained by fitting multiple economic operating points of the engine, and the curve function can represent the corresponding relationship between the reference engine speed and the reference engine torque.

[0122] 303. The hybrid control unit determines a plurality of reference operating points on the universal characteristic diagram based on the reference operating point and the power mode of the target hybrid vehicle, where the plurality of reference operating points includes the reference operating point, and the number of the reference operating points is less than or equal to a quantity threshold.

[0123] Among them, multiple reference operating points are used to determine the target operating point of the engine, and the number threshold is set by technicians according to actual conditions, such as being set to 8, and this embodiment of the present application does not limit this.

[0124] In one possible implementation, the hybrid control unit uses an offset method corresponding to the power mode to control the base operating point to offset on the universal characteristic map, thereby obtaining multiple offset operating points. The hybrid control unit uses a restricted area on the universal characteristic map to filter the multiple offset operating points, thereby obtaining multiple filtered operating points. The hybrid control unit determines the set of the base operating point and the multiple filtered operating points as the multiple reference operating points.

[0125] Because different power modes have different characteristics, the characteristics of each power mode must be considered when offsetting the reference operating point to ensure that the offset operating point obtained by the offset can be used in the corresponding power mode. For example, in the series power mode, there is no correlation between the engine speed and the motor speed, so there is no need to consider the motor speed limit when offsetting the reference operating point. In the parallel power mode, however, there is a correlation between the engine speed and the motor speed, so the motor speed limit must be considered when offsetting the reference operating point. The offset method corresponding to the power mode in the above embodiment combines the offset method described above. Controlling the offset of the reference operating point on the universal characteristic diagram refers to controlling the movement of the reference operating point on the universal characteristic diagram, with each movement resulting in an offset operating point. The restricted region can be used to limit both the upper and lower limits of the engine torque and the upper and lower limits of the engine speed. Using the restricted region to filter the multiple offset operating points is to remove the offset operating points outside the restricted region. In other words, the multiple filtered operating points all fall within the restricted region.

[0126] In this implementation, a power mode-dependent offset method is used to control the offset of the reference operating point on the universal characteristic diagram, resulting in multiple offset operating points, thereby achieving the purpose of determining the offset operating point based on the power mode. A restricted area is used to filter these multiple offset operating points, removing some offset operating points that do not meet the requirements, thereby obtaining multiple filtered operating points, thereby reducing the number of offset operating points. The combination of the reference operating point and the multiple filtered operating points is determined as multiple reference operating points. These multiple reference operating points can then be used to determine the target operating point, thereby improving the number and accuracy of the determined target operating points.

[0127] In order to explain the above embodiment more clearly, the above embodiment will be described in several parts below.

[0128] In the first part, the hybrid control unit uses an offset method corresponding to the power mode to control the reference operating point to offset on the universal characteristic diagram to obtain multiple offset operating points.

[0129] In a possible implementation, when the power mode is the series mode, the hybrid control unit controls the reference operating point to be offset on the universal characteristic diagram based on the engine speed or engine power corresponding to the reference operating point to obtain the multiple offset operating points.

[0130] Controlling the offset of the reference operating point on the universal characteristic map based on engine speed or engine power means controlling the offset of the reference operating point using engine speed or engine power as a constraint, so that the resulting offset operating point satisfies certain engine speed or engine power conditions. Accordingly, controlling the offset of the reference operating point based on engine speed or engine power is the offset method corresponding to series mode.

[0131] In this embodiment, when the power mode is the series mode, the reference operating point is offset with the engine speed or engine power as a limit, thereby obtaining multiple reference operating points, which conform to the actual situation of the series mode.

[0132] In order to explain the above embodiment more clearly, the above embodiment is described below through two examples.

[0133] Example 1: When the power mode is the series mode, the hybrid control unit controls the reference operating point to perform an equal engine speed offset on the universal characteristic diagram to obtain multiple offset operating points, and the engine speed corresponding to the multiple offset operating points is the same as that of the reference operating point.

[0134] The equal engine speed offset means that the engine speeds corresponding to the operating points before and after the offset are the same.

[0135] For example, see Figure 4 , the reference operating point 401 is located on the engine's optimal fuel economy curve 400, and the reference operating point 401 is controlled to perform equal engine speed offset on the universal characteristic map to obtain multiple offset operating points 402-407. Figure 4 and subsequent Figure 5-Figure 8 In the figure, the horizontal axis is the engine speed, and the vertical axis is the engine torque.

[0136] In some embodiments, in addition to performing the aforementioned constant engine speed offset, the hybrid control unit can also control the base operating condition unit to offset the optimal fuel economy curve to obtain multiple additional offset operating conditions. These additional offset operating conditions correspond to different engine speeds than the base operating condition point. These additional offset operating conditions can be merged with the multiple offset operating conditions obtained by the constant engine speed offset to form a total of multiple offset operating conditions. Subsequent filtering can then be performed based on these multiple offset operating conditions.

[0137] For example, see Figure 5 , controlling the reference operating point 401 to perform equal engine speed offset on the universal characteristic diagram to obtain multiple offset operating points 402-407, and then controlling the reference operating point 401 to deviate to the left and right on the optimal fuel economy curve 400 to obtain two additional offset operating points 501 and 502.

[0138] Example 2: When the power mode is the series mode, the hybrid control unit controls the reference operating point to perform an equal engine power offset on the universal characteristic diagram to obtain multiple offset operating points, and the engine power corresponding to the multiple offset operating points is the same as that of the reference operating point.

[0139] The equal engine power offset means that the engine powers corresponding to the operating points before and after the offset are the same.

[0140] For example, see Figure 6 The reference operating point 601 is located on the optimal fuel economy curve 600 of the engine. The reference operating point 601 is controlled to perform equal engine power offset on the universal characteristic diagram to obtain multiple offset operating points 602-607. The engine powers corresponding to the multiple offset operating points 602-607 are the same.

[0141] Another implementation of the first part is described below.

[0142] In one possible implementation, when the power mode is the parallel mode, the hybrid control unit controls the reference operating point to be offset on the universal characteristic diagram based on the required torque of the target hybrid vehicle and the reference drive motor torque to obtain the multiple offset operating points, and the reference drive motor torque is the difference between the required torque and the engine torque corresponding to the reference operating point.

[0143] The demanded torque is the torque required to be output by the target hybrid vehicle. In parallel mode, the target hybrid vehicle outputs torque jointly from the engine and the drive motor. Therefore, the sum of the engine torque and the motor torque should be the demanded torque. Furthermore, in special circumstances, the motor may not be operating, in which case the demanded torque is provided by the engine. In this case, the engine may also be driving the generator to generate electricity. Therefore, the demanded torque should be the sum of the engine torque and the generator torque, with the engine torque and the generator torque having opposite signs. In some embodiments, the demanded torque of the target hybrid vehicle is determined based on the accelerator pedal opening and vehicle speed of the target hybrid vehicle. Controlling the offset of the reference operating point based on the demanded torque and the reference drive motor torque means continuously adjusting the reference drive motor torque within the constraints of the demanded torque to achieve an offset from the reference engine torque.

[0144] In this embodiment, when the power mode is the parallel mode, the required torque and the reference drive motor torque are used to offset the reference operating point, thereby obtaining multiple reference operating points that conform to the actual situation of the parallel mode.

[0145] For example, when the power mode is parallel mode, the hybrid control unit transforms the reference drive motor torque multiple times using a preset torque variation to obtain multiple candidate drive motor torques. The hybrid control unit subtracts the required torque from each of the multiple candidate drive motor torques to obtain multiple candidate engine torques. Based on the multiple candidate engine torques, the hybrid control unit controls the reference operating point to perform an equal engine speed offset on the universal characteristic diagram to obtain multiple offset operating points. The engine speed corresponding to each of the multiple offset operating points is the same as that of the reference operating point, and each offset operating point corresponds to a candidate engine torque.

[0146] Among them, the preset torque change is set by technical personnel according to actual conditions, such as being set to 3N·m or 5N·m, etc., and the embodiments of the present application do not limit this.

[0147] In order to explain the above example more clearly, the following describes a method of performing multiple transformations on the reference drive motor torque using a preset torque variation in the above example to obtain multiple candidate drive motor torques.

[0148] In some embodiments, the hybrid control unit adds and subtracts the baseline drive motor torque from the preset torque change multiple times to obtain the multiple candidate drive motor torques, wherein each addition or subtraction can obtain a candidate drive motor torque, and the intervals between the multiple candidate drive motor torques are all the preset torque change.

[0149] For example, see Figure 7 Based on the required torque 701 and the reference drive motor torque 702 , the reference operating point 703 is controlled to perform an equal engine speed offset on the universal characteristic diagram to obtain multiple offset operating points 704 - 709 .

[0150] In the second part, the hybrid control unit uses the restricted area on the universal characteristic diagram to filter the multiple offset operating points to obtain multiple filtered operating points.

[0151] In a possible implementation, the hybrid control unit deletes the offset operating points that are not in the restricted area among the multiple offset operating points to obtain the multiple filtered operating points.

[0152] The restricted area can limit the engine torque. In other words, the restricted area can indicate the maximum and minimum engine torque values. An offset operating point where the engine torque is greater than the maximum engine torque and an offset operating point where the engine torque is less than the minimum engine torque are offset operating points that are not within the restricted area. The restricted area is set by a technician based on actual conditions and is not limited in this embodiment of the present application.

[0153] In this embodiment, a plurality of offset operating points can be filtered using the restricted area, thereby obtaining a plurality of filtered operating points, and the efficiency of filtering the offset operating points is relatively high.

[0154] In some embodiments, the restricted area includes a first restriction curve and a second restriction curve, wherein the first restriction curve is used to indicate the maximum value of the engine torque, that is, the upper limit of the engine torque for limiting the offset operating point; the second restriction curve is used to indicate the minimum value of the engine torque, that is, the lower limit of the engine torque for limiting the offset operating point. For example, see Figure 8 The first limiting curve 801 is located above the optimal fuel economy curve 802, and the second limiting curve 803 is located below the optimal fuel economy curve 802. The area between the first limiting curve 801 and the second limiting curve 803 is the limiting area.

[0155] In the third part, the hybrid control unit limits the number of the benchmark operating point and the multiple filtered operating points based on the number threshold to obtain the multiple reference operating points.

[0156] In one possible implementation, the hybrid control unit determines the number of the reference operating point and the plurality of filtered operating points. If the number is greater than or equal to a threshold, the hybrid control unit deletes some of the filtered operating points so that the number of the reference operating points and the filtered operating points after deletion is less than or equal to the threshold. If the number is less than the threshold, the hybrid control unit determines the set of the reference operating point and the plurality of filtered operating points as the plurality of reference operating points.

[0157] The method of deleting some of the multiple filtering operating condition points is to preferentially delete the filtering operating condition points that are far away from the reference operating condition point among the multiple filtering operating condition points.

[0158] In this embodiment, a quantity threshold is used to limit the number of filtered operating points, thereby ensuring that the number of multiple reference operating points obtained is less than or equal to the quantity threshold, thereby preventing excessive computational complexity caused by an excessive number of reference operating points.

[0159] 304. The hybrid control unit determines a target operating point of the engine of the target hybrid vehicle from the multiple reference operating points based on the power mode of the target hybrid vehicle. The target operating point is a reference operating point among the multiple reference operating points at which the target equivalent fuel consumption rate meets a preset condition.

[0160] The target equivalent fuel consumption rate at the reference operating point refers to the sum of the fuel consumption rate corresponding to the reference operating point and the equivalent fuel consumption rate of the power battery. The preset conditions are set by technicians based on actual conditions and are not limited in this embodiment of the application.

[0161] In one possible implementation, the hybrid control unit determines a target equivalent fuel consumption rate corresponding to each reference operating point based on the power mode of the target hybrid vehicle. The hybrid control unit determines the operating point with the lowest target equivalent fuel consumption rate among the multiple reference operating points as the target operating point.

[0162] Among them, the target equivalent fuel consumption rate is the lowest, which means that the target equivalent fuel consumption rate meets the preset conditions.

[0163] In this embodiment, the target equivalent fuel consumption (EFC) corresponding to each reference operating point is determined based on the power mode. The target EFC is used to determine a target operating point from multiple reference operating points. This target operating point has high accuracy and is the target hybrid vehicle's lowest EFC when the engine is operating at this target operating point.

[0164] In order to explain the above embodiment more clearly, the above embodiment will be described in several parts below.

[0165] The first part is that the hybrid control unit determines the target equivalent fuel consumption rate corresponding to each reference operating point based on the power mode of the target hybrid vehicle.

[0166] In one possible implementation, the hybrid control unit determines the battery equivalent fuel consumption rate corresponding to each reference operating point based on the power mode of the target hybrid vehicle. The hybrid control unit determines the fuel consumption rate corresponding to each reference operating point. The hybrid control unit adds the battery equivalent fuel consumption rate and the fuel consumption rate corresponding to each reference operating point to obtain the target equivalent fuel consumption rate corresponding to each reference operating point.

[0167] Among them, the battery equivalent fuel consumption rate is the result of converting the power consumption rate of the power battery into the fuel consumption rate.

[0168] Under this implementation, the battery equivalent fuel consumption rate and fuel consumption rate corresponding to each reference operating point are determined, and the battery equivalent fuel consumption rate and fuel consumption rate corresponding to each reference operating point are added together to obtain the target equivalent fuel consumption rate corresponding to each reference operating point. The target equivalent fuel consumption rate has a high accuracy.

[0169] In order to explain the above embodiment more clearly, the following is divided into two parts to respectively explain the methods of determining the battery equivalent fuel consumption rate and the fuel consumption rate in the above embodiment.

[0170] A. The hybrid control unit determines the battery equivalent fuel consumption rate corresponding to each reference operating point based on the power mode of the target hybrid vehicle.

[0171] In a possible implementation, when the power mode is the series mode, the hybrid control unit determines the battery equivalent fuel consumption rate corresponding to each reference operating point based on the required torque and the drive motor speed of the target hybrid vehicle.

[0172] In series mode, the required torque is provided by the drive motor. Therefore, the required torque is the required torque of the drive motor. The drive motor speed is the speed corresponding to the required torque. In series mode, the battery equivalent fuel consumption (BEC) is the same for different reference operating points.

[0173] In this embodiment, when the power mode is the series mode, the required torque and the drive motor speed are used to determine the battery equivalent fuel consumption rate corresponding to each reference operating point, and the battery equivalent fuel consumption rate is highly accurate.

[0174] For example, if the power mode is series mode, the hybrid control unit determines the drive motor power based on the target hybrid vehicle's required torque and the drive motor speed. The hybrid control unit divides the drive motor power by the power battery's discharge efficiency to obtain the power battery's discharge power. The hybrid control unit then uses an equivalence factor to convert the power battery's discharge power into the battery's equivalent fuel consumption rate.

[0175] The discharge efficiency of the power battery is calibrated by technicians according to actual conditions, and the present application embodiment does not limit this. The equivalent factor is the equivalent factor in ECMS.

[0176] In one possible implementation, when the power mode is the parallel mode, the hybrid control unit determines the drive motor torque corresponding to each reference operating point based on the required torque of the target hybrid vehicle and the engine torque corresponding to each reference operating point. The hybrid control unit also determines the battery equivalent fuel consumption corresponding to each reference operating point based on the drive motor torque and drive motor speed corresponding to each reference operating point.

[0177] Among them, in parallel mode, the required torque is provided by the drive motor and the engine together. If the engine torque increases, the drive motor torque of the drive motor will decrease. Therefore, in parallel mode, the required torque and the engine torque of each reference operating point will be used to determine the drive motor torque of each reference operating point, thereby determining the corresponding battery equivalent fuel consumption rate of each reference operating point.

[0178] In this embodiment, in parallel mode, the required torque and the engine torque at each reference operating point are used to determine the drive motor torque at each reference operating point, thereby determining the corresponding battery equivalent fuel consumption rate at each reference operating point, and the accuracy of the battery equivalent fuel consumption rate is relatively high.

[0179] For example, when the power mode is parallel mode, the hybrid control unit subtracts the target hybrid vehicle's required torque from the engine torque corresponding to each reference operating point to obtain the drive motor torque corresponding to each reference operating point. Based on the drive motor torque and drive motor speed corresponding to each reference operating point, the hybrid control unit determines the drive motor power corresponding to each reference operating point. The hybrid control unit divides the drive motor power corresponding to each reference operating point by the power battery's discharge efficiency to obtain the discharge power corresponding to each reference operating point. The hybrid control unit uses an equivalence factor to convert the power battery's discharge power corresponding to each reference operating point into the battery's equivalent fuel consumption rate corresponding to each reference operating point.

[0180] The driving motor speed is the driving motor speed corresponding to the driving motor torque.

[0181] B. The hybrid control unit determines the fuel consumption rate corresponding to each reference operating point.

[0182] In a possible implementation, for any reference operating point among multiple reference operating points, the hybrid control unit uses the engine speed and engine torque of the reference operating point to query in the third relationship table to obtain the fuel consumption rate of the reference operating point.

[0183] Among them, the third relationship table stores the correspondence between engine speed, engine torque and fuel consumption rate. The third relationship table is configured by technicians according to actual conditions, and the embodiment of the present application does not limit this.

[0184] In the second part, the hybrid control unit determines the reference operating point with the lowest target equivalent fuel consumption rate among the multiple reference operating points as the target operating point.

[0185] In a possible implementation, the hybrid control unit compares the target equivalent fuel consumption rates corresponding to the multiple reference operating points, and determines the reference operating point with the lowest target equivalent fuel consumption rate as the target operating point.

[0186] 305. The hybrid control unit controls the engine to operate according to the engine torque and engine speed corresponding to the target operating point.

[0187] In one possible implementation, the hybrid control unit sends an engine control instruction to the engine control unit, where the engine control instruction carries the engine torque and engine speed corresponding to the target operating point. The engine control unit obtains the engine control instruction, obtains the engine torque and engine speed from the engine control instruction, and controls the engine to operate at the engine torque and engine speed.

[0188] In order to more clearly illustrate the technical solution provided by the embodiment of the present application, Figure 9 The technical solutions provided in the embodiments of the present application are described.

[0189] Obtain vehicle parameters of the target hybrid vehicle. If the vehicle parameters meet the enabling conditions, determine whether the power mode of the target hybrid vehicle is series mode. The type of vehicle parameters and enabling conditions are set by a technician based on actual conditions and are not limited in this embodiment of the present application. If the power mode is series mode, determine a reference operating point on the optimal fuel economy curve based on a reference engine speed corresponding to the series mode. If the power mode is parallel mode, determine a reference operating point on the optimal fuel economy curve based on a reference engine speed corresponding to the parallel mode. Based on the reference operating point and the power mode of the target hybrid vehicle, determine multiple reference operating points on the universal characteristic diagram. The hybrid control unit determines the battery equivalent fuel consumption corresponding to each reference operating point based on the power mode of the target hybrid vehicle. The hybrid control unit determines the fuel consumption corresponding to each reference operating point. The hybrid control unit adds the battery equivalent fuel consumption and the fuel consumption corresponding to each reference operating point to obtain a target equivalent fuel consumption corresponding to each reference operating point. The hybrid control unit determines the reference operating point with the lowest target equivalent fuel consumption rate among the multiple reference operating points as the target operating point.

[0190] All of the above optional technical solutions can be combined in any way to form optional embodiments of the present application, and will not be described in detail here.

[0191] Through the technical solutions provided in the embodiments of the present application, a reference operating point of the target hybrid vehicle's engine on the optimal fuel economy curve of a universal characteristic map is determined. A plurality of reference operating points, fewer than a threshold number, are determined on the universal characteristic map using the reference operating point and the target hybrid vehicle's power mode. Based on the power mode, a target operating point is selected from the plurality of reference operating points, where the target equivalent fuel consumption rate meets a preset condition. This reduces the number of reference operating points used in determining the target operating point of the engine, and enables determination of the target operating point based on the different power modes of the hybrid vehicle, thereby improving the efficiency and accuracy of determining the target operating point.

[0192] Figure 10 This is a schematic diagram of the structure of a device for determining an engine operating point of a hybrid vehicle provided in an embodiment of the present application, see Figure 10 The device includes: a benchmark operating point determination module 1001, a reference operating point determination module 1002 and a target operating point determination module 1003.

[0193] The reference operating point determination module 1001 is configured to determine a reference operating point of the engine of the target hybrid vehicle on a universal characteristic map, where the reference operating point is located on an optimal fuel economy curve of the universal characteristic map.

[0194] The reference operating point determination module 1002 is configured to determine a plurality of reference operating points on the universal characteristic diagram based on the reference operating point and the power mode of the target hybrid vehicle, wherein the plurality of reference operating points includes the reference operating point, and the number of the reference operating points is less than or equal to a quantity threshold.

[0195] The target operating point determination module 1003 is configured to determine a target operating point of the engine of the target hybrid vehicle from the multiple reference operating points based on the power mode of the target hybrid vehicle, where the target operating point is a reference operating point among the multiple reference operating points at which the target equivalent fuel consumption rate meets a preset condition.

[0196] In one possible implementation, the reference operating point determination module 1001 is configured to determine a reference engine speed of the engine based on the power mode of the target hybrid vehicle. Based on the reference engine speed, a reference operating point is determined on the optimal fuel economy curve, and the engine speed corresponding to the reference operating point is the reference engine speed.

[0197] In one possible implementation, the reference operating point determination module 1001 is configured to determine a reference engine speed of the engine based on the accelerator pedal opening and vehicle speed of the target hybrid vehicle when the power mode is the series mode. If the power mode is the parallel mode, the reference engine speed of the engine is determined based on the current gear of the target hybrid vehicle.

[0198] In one possible implementation, the reference operating point determination module 1002 is configured to control the reference operating point to be offset on the universal characteristic diagram using an offset method corresponding to the power mode, thereby obtaining a plurality of offset operating points. The plurality of offset operating points are filtered using a restricted region on the universal characteristic diagram to obtain a plurality of filtered operating points. The plurality of reference operating points is obtained by limiting the number of the reference operating point and the plurality of filtered operating points based on a quantity threshold.

[0199] In one possible implementation, the reference operating point determination module 1002 is configured to, when the power mode is the series mode, control the reference operating point to be offset on the universal characteristic map based on the engine speed or engine power corresponding to the reference operating point to obtain the multiple offset operating points. When the power mode is the parallel mode, the reference operating point is controlled to be offset on the universal characteristic map based on the target hybrid vehicle's required torque and a reference drive motor torque to obtain the multiple offset operating points, where the reference drive motor torque is the difference between the required torque and the engine torque corresponding to the reference operating point.

[0200] In one possible implementation, the reference operating point determination module 1002 is configured to, when the power mode is the series mode, control the reference operating point to be offset by an equal engine speed on the universal characteristic map to obtain multiple offset operating points, each corresponding to the same engine speed as the reference operating point. Alternatively, when the power mode is the series mode, control the reference operating point to be offset by an equal engine power on the universal characteristic map to obtain multiple offset operating points, each corresponding to the same engine power as the reference operating point.

[0201] In one possible implementation, the reference operating point determination module 1002 is configured to, when the power mode is the parallel mode, perform multiple transformations on the reference drive motor torque using a preset torque variation to obtain a plurality of candidate drive motor torques. The required torque is subtracted from the plurality of candidate drive motor torques to obtain a plurality of candidate engine torques. Based on the plurality of candidate engine torques, the reference operating point is controlled to be offset on the universal characteristic diagram by a constant engine speed to obtain a plurality of offset operating points. The engine speed corresponding to each of the plurality of offset operating points is the same as that of the reference operating point, and each offset operating point corresponds to a candidate engine torque.

[0202] In a possible implementation, the reference operating point determination module 1002 is configured to delete the offset operating points that are not in the restricted area from the multiple offset operating points to obtain the multiple filtered operating points.

[0203] In one possible implementation, the target operating point determination module 1003 is configured to determine a target equivalent fuel consumption rate corresponding to each reference operating point based on the power mode of the target hybrid vehicle, and to determine the reference operating point with the lowest target equivalent fuel consumption rate among the multiple reference operating points as the target operating point.

[0204] In one possible implementation, the target operating point determination module 1003 is configured to determine the battery equivalent fuel consumption rate corresponding to each reference operating point based on the power mode of the target hybrid vehicle. The target operating point equivalent fuel consumption rate is determined by adding the battery equivalent fuel consumption rate and the fuel consumption rate corresponding to each reference operating point to obtain the target equivalent fuel consumption rate corresponding to each reference operating point.

[0205] In one possible implementation, the target operating point determination module 1003 is configured to determine the battery equivalent fuel consumption rate corresponding to each reference operating point based on the target hybrid vehicle's required torque and the drive motor speed when the power mode is the series mode. If the power mode is the parallel mode, the drive motor torque corresponding to each reference operating point is determined based on the target hybrid vehicle's required torque and the engine torque corresponding to each reference operating point. The battery equivalent fuel consumption rate corresponding to each reference operating point is determined based on the drive motor torque and the drive motor speed corresponding to each reference operating point.

[0206] It should be noted that the aforementioned embodiments of the apparatus for determining the engine operating point of a hybrid vehicle, when used to determine the engine operating point of a hybrid vehicle, illustrate the division of the aforementioned functional modules. In actual applications, the aforementioned functions can be distributed among different functional modules as needed, i.e., the internal structure of the computer device can be divided into different functional modules to perform all or part of the functions described above. Furthermore, the apparatus for determining the engine operating point of a hybrid vehicle provided in the aforementioned embodiments and the embodiment of the method for determining the engine operating point of a hybrid vehicle are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be further described here.

[0207] Through the technical solutions provided in the embodiments of the present application, a reference operating point of the target hybrid vehicle's engine on the optimal fuel economy curve of a universal characteristic map is determined. A plurality of reference operating points, fewer than a threshold number, are determined on the universal characteristic map using the reference operating point and the target hybrid vehicle's power mode. Based on the power mode, a target operating point is selected from the plurality of reference operating points, where the target equivalent fuel consumption rate meets a preset condition. This reduces the number of reference operating points used in determining the target operating point of the engine, and enables determination of the target operating point based on the different power modes of the hybrid vehicle, thereby improving the efficiency and accuracy of determining the target operating point.

[0208] The embodiment of the present application also provides a vehicle, Figure 11 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0209] Typically, the vehicle 1100 includes one or more processors 1101 and one or more memories 1102 .

[0210] Processor 1101 may include one or more processing cores, such as a quad-core processor or an eleven-core processor. Processor 1101 may be implemented in hardware using at least one of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). Processor 1101 may also include a main processor and a coprocessor. The main processor, also known as a CPU (Central Processing Unit), processes data while awake, while the coprocessor is a low-power processor that processes data while in standby mode. In some embodiments, processor 1101 may be integrated with a Graphics Processing Unit (GPU), which is responsible for rendering and drawing content displayed on the display. In some embodiments, processor 1101 may also include an Artificial Intelligence (AI) processor for handling computational operations related to machine learning.

[0211] Memory 1102 may include one or more computer-readable storage media, which may be non-transitory. Memory 1102 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices and flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in memory 1102 is used to store at least one computer program, which is executed by processor 1101 to implement the method for determining the engine operating point of a hybrid vehicle provided in the method embodiment of the present application.

[0212] Those skilled in the art will understand that Figure 11 The structure shown in the figure does not constitute a limitation on the vehicle 1100, and the vehicle 1100 may include more or fewer components than shown in the figure, or combine certain components, or adopt a different component arrangement.

[0213] In addition, the device provided in the embodiments of the present application can specifically be a chip, component or module, and the chip may include a connected processor and memory; wherein the memory is used to store instructions, and when the processor calls and executes the instructions, the chip can execute a method for determining the engine operating point of a hybrid vehicle provided in the above embodiment.

[0214] This embodiment also provides a computer-readable storage medium, which stores computer program code. When the computer program code is executed on a computer, the computer executes the above-mentioned related method steps to implement the method for determining the engine operating point of a hybrid vehicle provided in the above embodiment.

[0215] This embodiment further provides a computer program product. When the computer program product is run on a computer, it enables the computer to execute the above-mentioned related steps to implement the method for determining the engine operating point of a hybrid vehicle provided in the above embodiment.

[0216] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0217] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0218] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0219] The above content is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for determining an engine operating point of a hybrid vehicle, characterized in that: The method comprises: Determining a reference operating point of an engine of a target hybrid vehicle on a universal characteristic map, wherein the reference operating point is located on an optimal fuel economy curve of the universal characteristic map; Based on the reference operating point and the power mode of the target hybrid vehicle, determining a plurality of reference operating points on the universal characteristic diagram, the plurality of reference operating points including the reference operating point, and the number of the reference operating points being less than or equal to a number threshold; The determining the plurality of reference operating points on the universal characteristic diagram based on the reference operating point and the power mode of the target hybrid vehicle includes: The reference operating point is controlled to be offset on the universal characteristic diagram by adopting the offset method corresponding to the power mode to obtain a plurality of offset operating points; the plurality of offset operating points are filtered by adopting the restricted area on the universal characteristic diagram to obtain a plurality of filtered operating points; the reference operating point and the plurality of filtered operating points are limited in number based on the number threshold to obtain the plurality of reference operating points; The method of using the offset method corresponding to the power mode to control the reference operating point to be offset on the universal characteristic diagram to obtain a plurality of offset operating points includes: When the power mode is the series mode, based on the engine speed or engine power corresponding to the reference operating point, the reference operating point is controlled to be offset on the universal characteristic diagram to obtain the multiple offset operating points; when the power mode is the parallel mode, based on the required torque of the target hybrid vehicle and the reference drive motor torque, the reference operating point is controlled to be offset on the universal characteristic diagram to obtain the multiple offset operating points, and the reference drive motor torque is the difference between the required torque and the engine torque corresponding to the reference operating point; Based on the power mode of the target hybrid vehicle, a target operating point of the engine of the target hybrid vehicle is determined from the multiple reference operating points, and the target operating point is a reference operating point among the multiple reference operating points where a target equivalent fuel consumption rate meets a preset condition.

2. The method according to claim 1, characterized in that The step of determining a reference operating point of the engine of the target hybrid vehicle on a universal characteristic diagram includes: determining a base engine speed of the engine based on a power mode of the target hybrid vehicle; Based on the reference engine speed, the reference operating point is determined on the optimal fuel economy curve, and the engine speed corresponding to the reference operating point is the reference engine speed.

3. The method according to claim 2, characterized in that The determining of the reference engine speed of the engine based on the power mode of the target hybrid vehicle includes: When the power mode is the series mode, determining a reference engine speed of the engine based on an accelerator pedal opening and a vehicle speed of the target hybrid vehicle; When the power mode is the parallel mode, a reference engine speed of the engine is determined based on a current gear position of the target hybrid vehicle.

4. The method according to claim 1, characterized in that When the power mode is the series mode, based on the engine speed or engine power corresponding to the reference operating point, the reference operating point is controlled to be offset on the universal characteristic diagram to obtain the multiple offset operating points, including: When the power mode is the series mode, the reference operating point is controlled to be offset on the universal characteristic diagram by equal engine speed to obtain a plurality of offset operating points, and the engine speed corresponding to the plurality of offset operating points is the same as that of the reference operating point; Alternatively, when the power mode is the series mode, the reference operating point is controlled to perform an equal engine power offset on the universal characteristic diagram to obtain multiple offset operating points, and the engine power corresponding to the multiple offset operating points is the same as that of the reference operating point.

5. The method according to claim 1, characterized in that When the power mode is the parallel mode, based on the required torque of the target hybrid vehicle and the reference drive motor torque, the reference operating point is controlled to be offset on the universal characteristic diagram to obtain the multiple offset operating points, including: When the power mode is the parallel mode, the reference drive motor torque is transformed multiple times with a preset torque variation to obtain multiple candidate drive motor torques; Subtracting the required torque from the plurality of candidate drive motor torques respectively to obtain a plurality of candidate engine torques; Based on the multiple candidate engine torques, the reference operating point is controlled to perform an equal engine speed offset on the universal characteristic diagram to obtain the multiple offset operating points. The engine speeds corresponding to the multiple offset operating points are the same as those of the reference operating points, and one offset operating point corresponds to one candidate engine torque.

6. The method according to claim 1, characterized in that The method of filtering the plurality of offset operating points by using the restricted area on the universal characteristic diagram to obtain a plurality of filtered operating points includes: The offset operating condition points that are not in the restricted area are deleted from the multiple offset operating condition points to obtain the multiple filtered operating condition points.

7. The method according to claim 1, characterized in that The determining, based on the power mode of the target hybrid vehicle, a target operating point of the engine of the target hybrid vehicle from the plurality of reference operating points comprises: Determining a target equivalent fuel consumption rate corresponding to each of the reference operating points based on the power mode of the target hybrid vehicle; The reference operating point with the lowest target equivalent fuel consumption rate among the multiple reference operating points is determined as the target operating point.

8. The method according to claim 7, characterized in that The determining, based on the power mode of the target hybrid vehicle, the target equivalent fuel consumption rate corresponding to each of the reference operating points includes: Determining the battery equivalent fuel consumption rate corresponding to each of the reference operating points based on the power mode of the target hybrid vehicle; Determining the fuel consumption rate corresponding to each of the reference operating points; The battery equivalent fuel consumption rate and the fuel consumption rate corresponding to each of the reference operating points are added together to obtain the target equivalent fuel consumption rate corresponding to each of the reference operating points.

9. The method according to claim 8, characterized in that The determining, based on the power mode of the target hybrid vehicle, the battery equivalent fuel consumption rate corresponding to each of the reference operating points includes: When the power mode is the series mode, determining the battery equivalent fuel consumption rate corresponding to each of the reference operating points based on the required torque and the driving motor speed of the target hybrid vehicle; When the power mode is the parallel mode, the drive motor torque corresponding to each reference operating point is determined based on the required torque of the target hybrid vehicle and the engine torque corresponding to each reference operating point; the battery equivalent fuel consumption rate corresponding to each reference operating point is determined based on the drive motor torque and drive motor speed corresponding to each reference operating point.

10. A vehicle, characterized in that: The vehicle comprises: A memory for storing executable program codes; A processor is used to call and run the executable program code from the memory, so that the vehicle executes the method for determining the engine operating point of a hybrid vehicle as described in any one of claims 1 to 9.

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