Hybrid vehicle torque control method, device and equipment and storage medium
By testing and calibrating hybrid vehicles, the target torque of the engine and drive motor is calculated and controlled, which solves the problem of reduced engine ignition efficiency in the existing technology and achieves more efficient torque control.
Patent Information
- Application Number
- CN202411501769.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-01-21
AI Technical Summary
The prior art cannot accurately calculate the engine target torque, resulting in a reduction in the engine ignition efficiency of hybrid vehicles under high intake temperature or high water temperature.
Through testing and calibration of hybrid vehicles, a two-dimensional calibration table is obtained. Based on this table, the engine target torque is calculated, and the drive motor target torque is determined based on the driver's wheel-end torque demand. Finally, the engine and drive motor are torque controlled.
It achieves more precise torque control and improves the engine ignition efficiency of hybrid vehicles, especially under conditions such as high intake air temperature or high water temperature.
Smart Images
Figure CN119329496A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vehicle control technology, and in particular to a hybrid vehicle torque control method, device, equipment and storage medium. Background Art
[0002] The driver's required torque of a hybrid vehicle is achieved by the engine and the drive motor in coordination, and the torque control of the engine is usually based on the engine's minimum fuel consumption line (which can be understood as the engine torque point with the lowest fuel consumption rate at each engine speed), and then combined with the battery power to form an efficient working range around the minimum fuel consumption line. For example, when the battery power is far below the target power, the minimum fuel consumption line can be shifted upward, but the engine generally runs near the minimum fuel consumption line and is always in a high-efficiency state. However, in certain situations (such as high intake temperature or high water temperature), the engine control needs to delay the ignition angle for knock protection and other considerations, resulting in reduced ignition efficiency. At this time, the minimum fuel consumption line may be offset. If the engine continues to run according to the original minimum fuel consumption line, the efficiency will be reduced. Therefore, the industry is in urgent need of a method that can accurately calculate the engine target torque to perform torque control on hybrid vehicles to improve the engine ignition efficiency. Summary of the invention
[0003] The main purpose of the present application is to provide a hybrid vehicle torque control method, device, equipment and storage medium, aiming to solve the technical problem that the prior art cannot accurately calculate the engine target torque to control the torque of the hybrid vehicle.
[0004] To achieve the above object, the present application provides a hybrid vehicle torque control method, the method comprising the following steps:
[0005] Testing and calibrating the hybrid vehicle to obtain a two-dimensional calibration table, wherein the two-dimensional calibration table includes a first calibration table, a second calibration table, a third calibration table, and a fourth calibration table;
[0006] Calculating an engine target torque of the hybrid vehicle based on the two-dimensional calibration table;
[0007] Determining a target torque of a drive motor of the hybrid vehicle according to a wheel end torque required by a driver and the target torque of the engine;
[0008] Torque control is performed on an engine and a drive motor of the hybrid vehicle based on the engine target torque and the drive motor target torque.
[0009] In one embodiment, the step of testing and calibrating the hybrid vehicle to obtain a two-dimensional calibration table includes:
[0010] The engine cooling water temperature of the hybrid vehicle is fixed at a fully heated state, and an engine universal characteristic test is performed on the hybrid vehicle based on different engine intake temperatures to obtain a first test result;
[0011] The hybrid vehicle is calibrated according to the first test result to obtain a first calibration table, wherein the abscissa of the first calibration table is the engine intake temperature, the ordinate is the engine speed, and the output is the basic minimum fuel consumption torque.
[0012] In one embodiment, the step of testing and calibrating the hybrid vehicle to obtain a two-dimensional calibration table further includes:
[0013] fixing the engine intake temperature of the hybrid vehicle at a normal state, and performing an engine universal characteristic test on the hybrid vehicle based on different engine cooling water temperatures to obtain a second test result;
[0014] The hybrid vehicle is calibrated according to the second test result to obtain a second calibration table, wherein the abscissa of the second calibration table is the engine cooling water temperature, the ordinate is the engine speed, and the output is the minimum fuel consumption torque offset.
[0015] In one embodiment, the step of testing and calibrating the hybrid vehicle to obtain a two-dimensional calibration table further includes:
[0016] Performing a vehicle fuel consumption test and calibration on the hybrid vehicle to obtain a third calibration table and a fourth calibration table;
[0017] Among them, the horizontal axis of the third calibration table is the equivalent required engine torque, the vertical axis is the engine speed, and the output is the engine target torque offset; the horizontal axis of the fourth calibration table is the SOC deviation, the vertical axis is the deviation power, and the output is the target charging power offset.
[0018] In one embodiment, the step of calculating the target engine torque of the hybrid vehicle based on the two-dimensional calibration table includes:
[0019] Obtaining, from the two-dimensional calibration table, a basic minimum fuel consumption torque, a minimum fuel consumption torque offset, an engine target torque offset, and a target charging power offset corresponding to the hybrid vehicle in a current state;
[0020] The target engine torque of the hybrid vehicle is calculated based on the basic minimum fuel consumption torque, the minimum fuel consumption torque offset, the target engine torque offset, and the target charging power offset.
[0021] In one embodiment, the step of determining the target torque of the drive motor of the hybrid vehicle according to the wheel end torque required by the driver and the target torque of the engine includes:
[0022] Multiplying the target engine torque by the engine-to-wheel-end transmission ratio to obtain the torque transmitted from the engine to the wheels;
[0023] The target torque of the drive motor of the hybrid vehicle is obtained by subtracting the torque transmitted to the wheels by the engine from the wheel end torque required by the driver and then dividing the result by the drive motor to wheel end transmission ratio.
[0024] In addition, to achieve the above-mentioned purpose, the present application also proposes a hybrid vehicle torque control device, the hybrid vehicle torque control device comprising:
[0025] A test calibration module, used to test and calibrate the hybrid vehicle to obtain a two-dimensional calibration table, wherein the two-dimensional calibration table includes a first calibration table, a second calibration table, a third calibration table and a fourth calibration table;
[0026] A first calculation module, configured to calculate a target engine torque of the hybrid vehicle based on the two-dimensional calibration table;
[0027] A second calculation module, configured to determine a target torque of a driving motor of the hybrid vehicle according to a wheel end torque required by a driver and the target torque of the engine;
[0028] A torque control module is used to perform torque control on the engine and the drive motor of the hybrid vehicle based on the engine target torque and the drive motor target torque.
[0029] In addition, to achieve the above-mentioned purpose, the present application also proposes a hybrid vehicle torque control device, which includes: a memory, a processor, and a hybrid vehicle torque control program stored in the memory and executable on the processor, and the hybrid vehicle torque control program is configured to implement the steps of the hybrid vehicle torque control method as described above.
[0030] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a hybrid vehicle torque control program is stored on the storage medium. When the hybrid vehicle torque control program is executed by the processor, the steps of the hybrid vehicle torque control method described above are implemented.
[0031] In addition, to achieve the above-mentioned purpose, the present invention also provides a computer program product, which includes a hybrid vehicle torque control program, and when the hybrid vehicle torque control program is executed by a processor, the steps of the hybrid vehicle torque control method as described above are implemented.
[0032] The present application tests and calibrates the hybrid vehicle to obtain a two-dimensional calibration table, wherein the two-dimensional calibration table includes a first calibration table, a second calibration table, a third calibration table, and a fourth calibration table; the target torque of the engine of the hybrid vehicle is calculated based on the two-dimensional calibration table; the target torque of the drive motor of the hybrid vehicle is determined according to the wheel-end torque required by the driver and the target torque of the engine; and the engine and the drive motor of the hybrid vehicle are torque-controlled based on the target torque of the engine and the target torque of the drive motor. Compared with the traditional torque control method of hybrid vehicles, the above method of the present application calculates the target torque of the engine of the hybrid vehicle based on the two-dimensional calibration table obtained after testing and calibrating the hybrid vehicle, and then performs more accurate torque control on the engine and the drive motor of the hybrid vehicle based on the target torque of the engine and the target torque of the drive motor calculated according to the target torque of the engine, thereby improving the engine ignition efficiency of the hybrid vehicle. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 A schematic diagram of the structure of a hybrid vehicle torque control device in a hardware operating environment involved in an embodiment of the present application;
[0034] Figure 2 This is a flow chart of a first embodiment of a torque control method for a hybrid vehicle of the present application;
[0035] Figure 3 This is a flow chart of a second embodiment of a torque control method for a hybrid vehicle of the present application;
[0036] Figure 4 This is a flow chart of a third embodiment of a torque control method for a hybrid vehicle of the present application;
[0037] Figure 5 This is a structural block diagram of the first embodiment of the torque control device for a hybrid vehicle of the present application.
[0038] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0039] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0040] Reference Figure 1 , Figure 1 A schematic diagram of the structure of a hybrid vehicle torque control device in the hardware operating environment involved in an embodiment of the present application.
[0041] like Figure 1As shown, the hybrid vehicle torque control device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wireless-Fidelity, Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM), or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk storage. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.
[0042] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the torque control device of the hybrid vehicle, and may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.
[0043] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a hybrid vehicle torque control program.
[0044] exist Figure 1 In the hybrid vehicle torque control device shown, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the hybrid vehicle torque control device of the present application can be set in the hybrid vehicle torque control device, and the hybrid vehicle torque control device calls the hybrid vehicle torque control program stored in the memory 1005 through the processor 1001, and executes the hybrid vehicle torque control method provided in the embodiment of the present application.
[0045] The present application provides a method for controlling torque of a hybrid vehicle. Figure 2 , Figure 2 This is a flow chart of the first embodiment of the torque control method for a hybrid vehicle of the present application.
[0046] In this embodiment, the hybrid vehicle torque control method includes the following steps:
[0047] Step S10: testing and calibrating the hybrid vehicle to obtain a two-dimensional calibration table, wherein the two-dimensional calibration table includes a first calibration table, a second calibration table, a third calibration table, and a fourth calibration table.
[0048] It should be noted that the execution subject of the method of this embodiment can be a terminal device with data calculation, data processing and program running functions, such as a smart terminal, a computer, etc., or an electronic device with the same or similar functions, such as the above-mentioned hybrid vehicle torque control device. The following takes the hybrid vehicle torque control device (hereinafter referred to as the control device) as an example to illustrate this embodiment and the following embodiments.
[0049] It is understandable that the above hybrid vehicle, namely the hybrid electric vehicle (HEV), refers to a vehicle whose vehicle drive system is composed of two or more single drive systems that can operate simultaneously. These drive systems usually include a traditional internal combustion engine (diesel engine or gasoline engine) and an electric motor (such as a pure electric motor, supercapacitor, flywheel, hydraulic accumulator, etc.) that can significantly improve the fuel economy and emission performance of the internal combustion engine.
[0050] In a specific implementation, the hybrid vehicle can be tested and calibrated under different conditions to obtain the above two-dimensional calibration table. For example, the hybrid vehicle can be tested and calibrated under a first condition to obtain a first calibration table, the hybrid vehicle can be tested and calibrated under a second condition to obtain a second calibration table, the hybrid vehicle can be tested and calibrated under a third condition to obtain a third calibration table, and the hybrid vehicle can be tested and calibrated under a fourth condition to obtain a fourth calibration table.
[0051] Step S20: Calculating the target engine torque of the hybrid vehicle based on the two-dimensional calibration table.
[0052] It should be noted that the above engine target torque refers to the torque value that the engine is expected to achieve under specific operating conditions. In hybrid vehicles, the setting of the engine target torque is crucial to optimizing power output and fuel economy. By precisely controlling the engine output torque, hybrid vehicles can achieve optimal power performance and fuel economy in different driving modes.
[0053] It should be understood that data query can be performed on the two-dimensional calibration table (ie, the first calibration table, the second calibration table, the third calibration table and the fourth calibration table mentioned above), and the engine target torque of the hybrid vehicle can be calculated based on the data in the table.
[0054] Step S30: determining the target torque of the driving motor of the hybrid vehicle according to the wheel end torque required by the driver and the target torque of the engine.
[0055] It should be noted that the above-mentioned driver-demanded wheel-end torque refers to the torque value that the driver requests from the vehicle power system through operating the input device such as the accelerator pedal and is expected to be generated at the wheel end. In hybrid vehicles, the analysis and calculation of the driver's required wheel-end torque usually involves multiple factors, including the accelerator pedal opening, vehicle speed, gear position, engine speed, and current drive mode (such as pure electric drive, pure engine drive, or electric-oil combined drive). These factors jointly determine the vehicle power output expected by the driver and are converted into actual engine and motor torque output through the power system control strategy.
[0056] In a specific implementation, since the driver's required torque of the hybrid vehicle is achieved by the engine and the drive motor in coordination, the drive motor target torque corresponding to the hybrid vehicle can be determined based on the driver's required wheel-end torque and the engine target torque.
[0057] Step S40: performing torque control on the engine and the drive motor of the hybrid vehicle based on the engine target torque and the drive motor target torque.
[0058] In a specific implementation, the engine of the hybrid vehicle may be torque controlled based on the engine target torque, and the drive motor of the hybrid vehicle may be torque controlled based on the drive motor target torque.
[0059] This embodiment obtains a two-dimensional calibration table by testing and calibrating the hybrid vehicle, and the two-dimensional calibration table includes a first calibration table, a second calibration table, a third calibration table and a fourth calibration table; the target torque of the engine of the hybrid vehicle is calculated based on the two-dimensional calibration table; the target torque of the drive motor of the hybrid vehicle is determined according to the wheel end torque required by the driver and the target torque of the engine; and the engine and the drive motor of the hybrid vehicle are torque controlled based on the target torque of the engine and the target torque of the drive motor. Compared with the traditional torque control method of hybrid vehicles, the above method of this embodiment calculates the target torque of the engine of the hybrid vehicle based on the two-dimensional calibration table obtained after testing and calibrating the hybrid vehicle, and then performs more accurate torque control on the engine and the drive motor of the hybrid vehicle based on the target torque of the engine and the target torque of the drive motor calculated according to the target torque of the engine, thereby improving the engine ignition efficiency of the hybrid vehicle.
[0060] refer to Figure 3 , Figure 3 This is a flow chart of a second embodiment of a torque control method for a hybrid vehicle of the present application.
[0061] In a feasible implementation manner, the step S10 may include:
[0062] Step S101: fixing the engine cooling water temperature of the hybrid vehicle at a fully heated state, performing an engine universal characteristic test on the hybrid vehicle based on different engine intake temperatures, and obtaining a first test result.
[0063] Step S102: Calibrate the hybrid vehicle according to the first test result to obtain a first calibration table, wherein the abscissa of the first calibration table is the engine intake temperature, the ordinate is the engine speed, and the output is the basic minimum fuel consumption torque.
[0064] In a specific implementation, the engine of a hybrid vehicle can be tested and calibrated in an engine test bench to obtain the above-mentioned first calibration table. More specifically, the engine test bench can be used to control the engine water cooling system to keep the engine cooling water temperature fixed at a fully hot engine state (such as 95°C ± 2°C), and then control the intake air intercooling system to control the intake air temperature at different set values, and then perform an engine universal characteristic test to obtain the engine universal characteristic data at each set intake air temperature (at least including engine cooling water temperature, engine intake air temperature, engine speed, engine torque, and engine fuel consumption rate), and then obtain the engine torque corresponding to the lowest engine fuel consumption rate at each engine speed, and after sorting, the above-mentioned first calibration table can be obtained.
[0065] Step S103: fixing the engine intake temperature of the hybrid vehicle at a normal state, performing an engine universal characteristic test on the hybrid vehicle based on different engine cooling water temperatures, and obtaining a second test result.
[0066] Step S104: Calibrate the hybrid vehicle according to the second test result to obtain a second calibration table, wherein the abscissa of the second calibration table is the engine cooling water temperature, the ordinate is the engine speed, and the output is the minimum fuel consumption torque offset.
[0067] In a specific implementation, the engine test bench can be used to control the intake intercooling system to keep the engine intake temperature fixed at a normal state (for example, 35°C±2°C), and then the water cooling system can be controlled to control the cooling water temperature at different set values. The engine universal characteristic test is then carried out to obtain the engine universal characteristic data at each set cooling water temperature (at least including engine cooling water temperature, engine intake temperature, engine speed, engine torque, and engine fuel consumption rate), and then obtain the engine torque corresponding to the lowest engine fuel consumption rate at each engine speed. After sorting, the above-mentioned second calibration table can be obtained.
[0068] Step S105: Perform a vehicle fuel consumption test and calibration on the hybrid vehicle to obtain a third calibration table and a fourth calibration table.
[0069] Among them, the horizontal axis of the third calibration table is the equivalent required engine torque, the vertical axis is the engine speed, and the output is the engine target torque offset; the horizontal axis of the fourth calibration table is the SOC deviation, the vertical axis is the deviation power, and the output is the target charging power offset.
[0070] It should be noted that the above-mentioned equivalent required engine torque refers to the torque that the engine needs to output when the driver's required wheel-end torque is fully met by the engine output, that is, the equivalent required engine torque = driver's required wheel-end torque / engine-to-wheel-end transmission ratio. The above-mentioned SOC (State of Charge) deviation refers to the error between the SOC target value and the actual value of the battery in the battery management system.
[0071] In a specific implementation, the third calibration table can be obtained during the vehicle fuel consumption test and calibration process. Most intervals should be calibrated to 0. In the low equivalent demand engine torque interval, a small negative value can be appropriately used to avoid excessive engine output causing overcharging of the power battery. In the high equivalent demand engine torque interval, a small positive value can be appropriately used to avoid excessive engine output causing overdischarge or severe power feeding of the power battery. The fourth calibration table can also be obtained during the vehicle fuel consumption test and calibration process. In the interval where the SOC deviation is greater than or equal to 0, it should be calibrated to 0. As the SOC deviation becomes smaller and smaller, the target charging power offset can gradually increase.
[0072] In this embodiment, the engine cooling water temperature of the hybrid vehicle is fixed at a fully heated state, and the engine universal characteristic test is performed on the hybrid vehicle based on different engine intake temperatures to obtain a first test result; the hybrid vehicle is calibrated according to the first test result to obtain a first calibration table, in which the abscissa of the first calibration table is the engine intake temperature, the ordinate is the engine speed, and the output is the basic minimum fuel consumption torque; the engine intake temperature of the hybrid vehicle is fixed at a normal state, and the engine universal characteristic test is performed on the hybrid vehicle based on different engine cooling water temperatures to obtain a first calibration table. Second test result: The hybrid vehicle is calibrated according to the second test result to obtain a second calibration table, wherein the horizontal coordinate of the second calibration table is the engine cooling water temperature, the vertical coordinate is the engine speed, and the output is the minimum fuel consumption torque offset; the hybrid vehicle is subjected to a vehicle fuel consumption test and calibration to obtain a third calibration table and a fourth calibration table; wherein the horizontal coordinate of the third calibration table is the equivalent required engine torque, the vertical coordinate is the engine speed, and the output is the engine target torque offset, and the horizontal coordinate of the fourth calibration table is the SOC deviation, the vertical coordinate is the deviation power, and the output is the target charging power offset. Compared with the traditional hybrid vehicle torque control method, the above method of this embodiment can obtain the corresponding data sets (i.e., the first calibration table, the second calibration table, the third calibration table, and the fourth calibration table) of the hybrid vehicle under different states by conducting engine universal characteristic tests and calibrations, and vehicle fuel consumption tests and calibrations on the hybrid vehicle, thereby providing a data basis for the subsequent torque control process of the hybrid vehicle.
[0073] refer to Figure 4 , Figure 4 This is a flow chart of a third embodiment of a torque control method for a hybrid vehicle of the present application.
[0074] In a feasible implementation manner, the step S20 may include:
[0075] Step S201: Obtaining the basic minimum fuel consumption torque, minimum fuel consumption torque offset, engine target torque offset and target charging power offset corresponding to the hybrid vehicle in the current state from the two-dimensional calibration table.
[0076] Step S202: Calculating the engine target torque of the hybrid vehicle based on the basic minimum fuel consumption torque, the minimum fuel consumption torque offset, the engine target torque offset and the target charging power offset.
[0077] In specific implementation, the engine torque of hybrid vehicles should be controlled as close as possible to the actual minimum fuel consumption torque (i.e., basic minimum fuel consumption torque + minimum fuel consumption torque offset + engine target torque offset), while meeting the charging requirements when the battery is fed (i.e., target charging power offset), and ensuring that the sum of the engine torque and the drive motor torque can meet the driver's required torque. Therefore, the engine target torque of a hybrid vehicle can be calculated based on the following formula: Engine target torque = basic minimum fuel consumption torque + minimum fuel consumption torque offset + engine target torque offset + target charging power offset * 9550 / engine speed.
[0078] In a feasible implementation manner, the step S30 may include:
[0079] Step S301: multiply the engine target torque by the engine-to-wheel transmission ratio to obtain the torque transmitted from the engine to the wheels.
[0080] Step S302: subtract the torque transmitted to the wheels by the engine from the wheel-end torque required by the driver and divide the resultant by the transmission ratio from the drive motor to the wheel-end to obtain the target torque of the drive motor of the hybrid vehicle.
[0081] In a specific implementation, the target torque of the drive motor of the hybrid vehicle can be calculated based on the following formula: drive motor target torque = (driver required wheel end torque - engine target torque * engine to wheel end transmission ratio) / drive motor to wheel end transmission ratio.
[0082] This embodiment provides obtaining the basic minimum fuel consumption torque, the minimum fuel consumption torque offset, the engine target torque offset and the target charging power offset corresponding to the hybrid vehicle in the current state from the two-dimensional calibration table; calculating the engine target torque of the hybrid vehicle based on the basic minimum fuel consumption torque, the minimum fuel consumption torque offset, the engine target torque offset and the target charging power offset; multiplying the engine target torque by the engine-to-wheel end transmission ratio to obtain the torque transmitted to the wheel by the engine; subtracting the torque transmitted to the wheel by the driver's required wheel end torque and dividing it by the drive motor-to-wheel end transmission ratio to obtain the drive motor target torque of the hybrid vehicle. Compared with the traditional hybrid vehicle torque control method, the above method of this embodiment calculates the engine target torque of the hybrid vehicle according to the basic minimum fuel consumption torque, the minimum fuel consumption torque offset, the engine target torque offset and the target charging power offset corresponding to the hybrid vehicle in the current state, and then calculates the drive motor target torque of the hybrid vehicle according to the engine target torque, thereby achieving more accurate torque calculation, and thus being able to more accurately control the torque of the hybrid vehicle.
[0083] In addition, an embodiment of the present application further proposes a storage medium, on which a hybrid vehicle torque control program is stored. When the hybrid vehicle torque control program is executed by a processor, the steps of the hybrid vehicle torque control method described above are implemented.
[0084] Reference Figure 5 , Figure 5 This is a structural block diagram of the first embodiment of the torque control device for a hybrid vehicle of the present application.
[0085] like Figure 5 As shown, the hybrid vehicle torque control device proposed in the embodiment of the present application includes:
[0086] A test calibration module 501 is used to test and calibrate the hybrid vehicle to obtain a two-dimensional calibration table, wherein the two-dimensional calibration table includes a first calibration table, a second calibration table, a third calibration table and a fourth calibration table;
[0087] A first calculation module 502, configured to calculate the target engine torque of the hybrid vehicle based on the two-dimensional calibration table;
[0088] A second calculation module 503 is used to determine the target torque of the driving motor of the hybrid vehicle according to the wheel end torque required by the driver and the target torque of the engine;
[0089] The torque control module 504 is configured to perform torque control on the engine and the drive motor of the hybrid vehicle based on the engine target torque and the drive motor target torque.
[0090] This embodiment obtains a two-dimensional calibration table by testing and calibrating the hybrid vehicle, and the two-dimensional calibration table includes a first calibration table, a second calibration table, a third calibration table and a fourth calibration table; the target torque of the engine of the hybrid vehicle is calculated based on the two-dimensional calibration table; the target torque of the drive motor of the hybrid vehicle is determined according to the wheel end torque required by the driver and the target torque of the engine; and the engine and the drive motor of the hybrid vehicle are torque controlled based on the target torque of the engine and the target torque of the drive motor. Compared with the traditional torque control method of hybrid vehicles, the above method of this embodiment calculates the target torque of the engine of the hybrid vehicle based on the two-dimensional calibration table obtained after testing and calibrating the hybrid vehicle, and then performs more accurate torque control on the engine and the drive motor of the hybrid vehicle based on the target torque of the engine and the target torque of the drive motor calculated according to the target torque of the engine, thereby improving the engine ignition efficiency of the hybrid vehicle.
[0091] Based on the first embodiment of the torque control device for a hybrid vehicle of the present application, a second embodiment of the torque control device for a hybrid vehicle of the present application is proposed.
[0092] In this embodiment, the test calibration module 501 is further used to fix the engine cooling water temperature of the hybrid vehicle in a fully hot engine state, and perform an engine universal characteristic test on the hybrid vehicle based on different engine intake temperatures to obtain a first test result; calibrate the hybrid vehicle according to the first test result to obtain a first calibration table, wherein the abscissa of the first calibration table is the engine intake temperature, the ordinate is the engine speed, and the output is the basic minimum fuel consumption torque.
[0093] Furthermore, the test calibration module 501 is also used to fix the engine intake temperature of the hybrid vehicle at a normal state, perform an engine universal characteristic test on the hybrid vehicle based on different engine cooling water temperatures, and obtain a second test result; calibrate the hybrid vehicle according to the second test result to obtain a second calibration table, wherein the abscissa of the second calibration table is the engine cooling water temperature, the ordinate is the engine speed, and the output is the minimum fuel consumption torque offset.
[0094] Furthermore, the test calibration module 501 is also used to perform a vehicle fuel consumption test and calibration on the hybrid vehicle to obtain a third calibration table and a fourth calibration table; wherein the abscissa of the third calibration table is the equivalent required engine torque, the ordinate is the engine speed, and the output is the engine target torque offset; the abscissa of the fourth calibration table is the SOC deviation, the ordinate is the deviation power, and the output is the target charging power offset.
[0095] Furthermore, the first calculation module 502 is also used to obtain the basic minimum fuel consumption torque, minimum fuel consumption torque offset, engine target torque offset and target charging power offset corresponding to the hybrid vehicle in the current state from the two-dimensional calibration table; and calculate the engine target torque of the hybrid vehicle based on the basic minimum fuel consumption torque, the minimum fuel consumption torque offset, the engine target torque offset and the target charging power offset.
[0096] Furthermore, the second calculation module 503 is also used to multiply the engine target torque by the engine-to-wheel end transmission ratio to obtain the torque transmitted to the wheel by the engine; and to subtract the torque transmitted to the wheel by the driver's required wheel end torque from the engine and divide the resultant by the drive motor-to-wheel end transmission ratio to obtain the drive motor target torque of the hybrid vehicle.
[0097] Other embodiments or specific implementations of the hybrid vehicle torque control device of the present application can refer to the above-mentioned method embodiments, which will not be repeated here.
[0098] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.
[0099] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.
[0100] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory / random access memory, a disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.
[0101] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A hybrid vehicle torque control method, characterized in that: The method comprises the following steps: Testing and calibrating the hybrid vehicle to obtain a two-dimensional calibration table, wherein the two-dimensional calibration table includes a first calibration table, a second calibration table, a third calibration table, and a fourth calibration table; Calculating an engine target torque of the hybrid vehicle based on the two-dimensional calibration table; Determining a target torque of a drive motor of the hybrid vehicle according to a wheel end torque required by a driver and the target torque of the engine; Torque control is performed on an engine and a drive motor of the hybrid vehicle based on the engine target torque and the drive motor target torque.
2. The hybrid vehicle torque control method according to claim 1, characterized in that: The step of testing and calibrating the hybrid vehicle to obtain a two-dimensional calibration table includes: The engine cooling water temperature of the hybrid vehicle is fixed at a fully heated state, and an engine universal characteristic test is performed on the hybrid vehicle based on different engine intake temperatures to obtain a first test result; The hybrid vehicle is calibrated according to the first test result to obtain a first calibration table, wherein the abscissa of the first calibration table is the engine intake temperature, the ordinate is the engine speed, and the output is the basic minimum fuel consumption torque.
3. The hybrid vehicle torque control method according to claim 1, characterized in that: The step of testing and calibrating the hybrid vehicle to obtain a two-dimensional calibration table also includes: fixing the engine intake temperature of the hybrid vehicle at a normal state, performing an engine universal characteristic test on the hybrid vehicle based on different engine cooling water temperatures, and obtaining a second test result; The hybrid vehicle is calibrated according to the second test result to obtain a second calibration table, wherein the abscissa of the second calibration table is the engine cooling water temperature, the ordinate is the engine speed, and the output is the minimum fuel consumption torque offset.
4. The hybrid vehicle torque control method according to claim 1, characterized in that: The step of testing and calibrating the hybrid vehicle to obtain a two-dimensional calibration table also includes: Performing a vehicle fuel consumption test and calibration on the hybrid vehicle to obtain a third calibration table and a fourth calibration table; Among them, the horizontal axis of the third calibration table is the equivalent required engine torque, the vertical axis is the engine speed, and the output is the engine target torque offset; the horizontal axis of the fourth calibration table is the SOC deviation, the vertical axis is the deviation power, and the output is the target charging power offset.
5. The hybrid vehicle torque control method according to claim 1, characterized in that: The step of calculating the target engine torque of the hybrid vehicle based on the two-dimensional calibration table includes: Obtaining, from the two-dimensional calibration table, a basic minimum fuel consumption torque, a minimum fuel consumption torque offset, an engine target torque offset, and a target charging power offset corresponding to the hybrid vehicle in a current state; The target engine torque of the hybrid vehicle is calculated based on the basic minimum fuel consumption torque, the minimum fuel consumption torque offset, the target engine torque offset, and the target charging power offset.
6. The hybrid vehicle torque control method according to claim 1, characterized in that: The step of determining the target torque of the driving motor of the hybrid vehicle according to the wheel end torque required by the driver and the target torque of the engine comprises: Multiplying the target engine torque by the engine-to-wheel-end transmission ratio to obtain the torque transmitted from the engine to the wheels; The target torque of the drive motor of the hybrid vehicle is obtained by subtracting the torque transmitted to the wheels by the engine from the wheel end torque required by the driver and then dividing the result by the drive motor to wheel end transmission ratio.
7. A torque control device for a hybrid vehicle, characterized in that: The hybrid vehicle torque control device comprises: A test calibration module, used to test and calibrate the hybrid vehicle to obtain a two-dimensional calibration table, wherein the two-dimensional calibration table includes a first calibration table, a second calibration table, a third calibration table and a fourth calibration table; A first calculation module, configured to calculate a target engine torque of the hybrid vehicle based on the two-dimensional calibration table; A second calculation module, configured to determine a target torque of a driving motor of the hybrid vehicle according to a wheel end torque required by a driver and the target torque of the engine; A torque control module is used to perform torque control on the engine and the drive motor of the hybrid vehicle based on the engine target torque and the drive motor target torque.
8. A hybrid vehicle torque control device, characterized in that: The device comprises: a memory, a processor, and a hybrid vehicle torque control program stored in the memory and executable on the processor, wherein the hybrid vehicle torque control program is configured to implement the steps of the hybrid vehicle torque control method according to any one of claims 1 to 6.
9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, on which a hybrid vehicle torque control program is stored. When the hybrid vehicle torque control program is executed by a processor, the steps of the hybrid vehicle torque control method as claimed in any one of claims 1 to 6 are implemented.
10. A computer program product, characterized in that The computer program product comprises a hybrid vehicle torque control program, and when the hybrid vehicle torque control program is executed by a processor, the steps of the hybrid vehicle torque control method according to any one of claims 1 to 6 are implemented.