Engine torque compensation method, vehicle controller and vehicle

Abstract

The present invention provides a torque compensation method for an engine, a vehicle controller and a vehicle, the method comprising determining a plurality of measurement conditions according to temperature measurement points and torque measurement points; cutting off the control of the vehicle by the drive system; controlling the engine to operate at a preset speed threshold under each condition, and determining the actual torque of the engine and the actual torque of the generator or motor under each condition; determining the target torque of the engine, and determining the torque compensation value of the engine under each condition according to the target torque and the actual torque; and compensating the engine torque of each condition according to the torque compensation value. The measurement conditions determined by this scheme can compensate for the torque within the entire operating temperature and torque range, and have a wider coverage. Since the torque of the generator or motor is of high precision and good stability, the target torque of the engine calculated by it is of high accuracy, and the torque compensation value finally determined is also more accurate, which improves the power stability and gear shifting smoothness of the vehicle, and can also prevent the battery from being overcharged or over-discharged.

Description

Technical Field

[0001] The present invention relates to the technical field of engine torque compensation, and in particular to an engine torque compensation method, a vehicle controller and a vehicle. Background Art

[0002] Hybrid vehicles use a hybrid working mode, in which the engine is required to drive the vehicle. In this working mode, if the engine torque is not calculated accurately, it will seriously affect the vehicle's power and smoothness during gear shifting. For extended-range vehicles, there is also an extended-range mode, in which the engine drives the generator to charge the drive motor or energy storage battery. In this mode, if the engine torque is inaccurate, it will cause unstable driving force or battery overcharge and overdischarge problems. Summary of the invention

[0003] The purpose of the present invention is to solve the problem in the prior art that the inaccurate calculation of the engine torque of a hybrid vehicle affects the driving force or the battery.

[0004] To solve the above problems, an embodiment of the present invention discloses a method for compensating the torque of an engine in a driving system of a hybrid vehicle, wherein the driving system comprises a first driving device, an electromechanical coupling device, and a second driving device, wherein the first driving device and the second driving device are respectively connected to the electromechanical coupling device;

[0005] The first driving device is an engine, the second driving device is a generator or an electric motor; and the torque compensation method includes:

[0006] S1: determining a plurality of temperature measurement points within the full operating temperature range of the engine, determining a plurality of torque measurement points within the full operating torque range of the engine, and arranging and combining each of the plurality of temperature measurement points and each of the plurality of torque measurement points to determine a plurality of measurement operating conditions;

[0007] S2: Cut off the drive system's control over the hybrid vehicle;

[0008] S3: Controlling the engine to operate at a preset speed threshold in each of the multiple measuring conditions, and determining an actual torque of the engine and an actual torque of the generator or the motor in each measuring condition;

[0009] S4: determining a target torque of the engine corresponding to each measurement condition according to an actual torque of the generator or the motor corresponding to each measurement condition in the multiple measurement conditions, and determining a torque compensation value of the engine corresponding to each measurement condition in the multiple measurement conditions according to the target torque of the engine and the actual torque of the engine;

[0010] S5: Obtaining the current temperature and current torque of the engine, determining the current operating condition of the engine according to the current temperature and current torque, and compensating the torque of the engine under the current operating condition according to the torque compensation value corresponding to each measured condition.

[0011] By adopting the above scheme, multiple measurement conditions are determined according to multiple temperature measurement points and torque measurement points of the engine under all working conditions, covering all working conditions of the engine, and the torque within the full operating temperature and torque range can be compensated, with a wider coverage. The torque of the corresponding working condition is compensated according to the determined torque compensation value, without the need for other estimates and predictions, so that the adjusted torque is more accurate. In addition, this scheme uses the torque of the generator or motor to calculate the target torque that the engine needs to output. Since the torque of the generator or motor has high accuracy and good stability, the target torque of the engine calculated by the torque of the generator or motor has high accuracy, so that the torque compensation value finally determined is also more accurate. In addition, after compensating the torque of the engine, this scheme can obtain a more accurate actual torque of the engine, so that the torque actually output by the engine approaches the target torque, thereby optimizing the power stability and gear shifting smoothness of the vehicle, and preventing overcharging and over-discharging of the battery.

[0012] According to another specific embodiment of the present invention, in the torque compensation method of the engine disclosed in the embodiment of the present invention, in step S1, multiple temperature measurement points are determined according to the minimum temperature, maximum temperature, and temperature sampling step of the full operating temperature range of the engine; wherein the minimum temperature ranges from -35°C to -25°C; the maximum temperature ranges from 85°C to 95°C; the temperature sampling step ranges from 1°C to 10°C; and, multiple torque measurement points are determined according to the minimum torque, maximum torque, and torque sampling step of the full operating torque range of the engine; wherein the minimum torque ranges from 0Nm to 5Nm; the maximum torque ranges from 245Nm to 255Nm; the torque sampling step ranges from 1Nm to 10Nm.

[0013] By adopting the above scheme, since multiple temperature measurement points and multiple torque measurement points are determined under all engine operating conditions, and multiple measurement conditions are determined based on the multiple temperature measurement points and torque measurement points, the measurement conditions basically cover all engine operating conditions. The torque compensation value is calculated based on the multiple determined measurement conditions, and the torque of the engine under the corresponding condition is compensated based on the determined torque compensation value, which can not only compensate the torque within the full operating temperature and torque range of the engine, covering a wider range, but also improve the accuracy of compensation.

[0014] According to another specific embodiment of the present invention, in the engine torque compensation method disclosed in the embodiment of the present invention, in step S2, cutting off the control of the hybrid vehicle by the drive system includes: switching the gear of the hybrid vehicle to a parking gear or a neutral gear.

[0015] By adopting the above scheme, after the drive system cuts off the control of the hybrid vehicle, the drive system will not output torque to the vehicle, and the engine, generator or motor will not be affected by the vehicle's torque output and the measurement of its actual torque and the calculation of its target torque.

[0016] According to another specific embodiment of the present invention, the torque compensation method of the engine disclosed in the embodiment of the present invention, in step S3, determines the actual torque of the engine under each measurement condition, and the actual torque of the generator or the motor, including: determining the actual torque of the engine output at the lowest torque at each temperature measurement point among multiple temperature measurement points, and the actual torque output of the generator or the motor; controlling the torque of the engine to start from the lowest torque, increase to the highest torque with a torque sampling step, and measure the actual torque of the engine output corresponding to each torque point, and the actual torque output of the generator or the motor.

[0017] By adopting the above scheme, the target torque required to be output by the engine is calculated using the output torque of the generator or motor. Since the torque of the generator or motor has high precision and good stability, the target torque of the engine calculated by the torque of the generator or motor has high accuracy, so that the torque compensation value finally determined is also more accurate.

[0018] According to another specific embodiment of the present invention, the torque compensation method of the engine disclosed in the embodiment of the present invention, before measuring the actual torque output by the engine corresponding to each torque measurement point and the actual torque output by the generator or the motor, further includes: waiting for a preset time range; wherein the preset time range is 10s to 20s; and, in step S4, determining the torque compensation value of the engine according to the following formula:

[0019] Δ T =TEM-TEng

[0020] Among them, Δ T is the torque compensation value of the engine, TEM is the target torque of the engine, and TEng is the actual torque of the engine.

[0021] By adopting the above scheme, after the engine torque changes, waiting for a period of time can make the torque of the generator or motor tend to stabilize, thereby preventing measurement errors caused by torque fluctuations, and thus preventing the calculated torque compensation value from being inaccurate.

[0022] According to another specific embodiment of the present invention, in the torque compensation method of the engine disclosed in the embodiment of the present invention, the input end of the electromechanical coupling device is connected to the output end of the engine, and the output end is connected to the generator or the motor; and the electromechanical coupling device is a clutch; the preset speed threshold is the target speed of the engine.

[0023] According to another specific embodiment of the present invention, in the torque compensation method of the engine disclosed in the embodiment of the present invention, the input end of the electromechanical coupling device is connected to the output end of the engine, and the output end is connected to the generator or the motor; and the electromechanical coupling device includes a clutch and a gear speed change mechanism, and the speed ratio between the engine and the generator or the motor is a first speed ratio; and the preset speed threshold is the ratio of the target speed of the engine to the first speed ratio.

[0024] According to another specific embodiment of the present invention, in the torque compensation method of the engine disclosed in the embodiment of the present invention, the input end of the electromechanical coupling device is connected to the output end of the engine, and the output end is connected to the generator or the motor; and the electromechanical coupling device is a planetary gear mechanism, and the speed ratio between the engine and the generator or the motor is the second speed ratio; the preset speed threshold is the ratio of the target speed of the engine to the second speed ratio.

[0025] An embodiment of the present invention further discloses a vehicle controller, comprising: a memory, the memory being used to store a control program; and a processor, the processor executing the steps of the engine torque compensation method described in the above embodiment when processing the control program.

[0026] An embodiment of the present invention further discloses a vehicle, comprising the vehicle controller as described in the above embodiment.

[0027] The beneficial effects of the present invention are:

[0028] The torque compensation method of the engine provided by this scheme determines multiple measurement conditions according to multiple temperature measurement points and torque measurement points of the engine under all working conditions, covers all working conditions of the engine, and can compensate for the torque within the full operating temperature and torque range, with a wider coverage. The torque of the corresponding working condition is compensated according to the determined torque compensation value, without other estimation and prediction, so that the adjusted torque is more accurate. In addition, this scheme uses the torque of the generator or motor to calculate the target torque that the engine needs to output. Since the torque of the generator or motor has high accuracy and good stability, the target torque of the engine calculated by the torque of the generator or motor has high accuracy, so that the torque compensation value finally determined is also more accurate. In addition, after compensating the torque of the engine, this scheme can obtain a more accurate actual torque of the engine, so that the torque actually output by the engine is close to the target torque, thereby optimizing the power stability and gear shifting smoothness of the vehicle, and preventing overcharging and over-discharging of the battery.

[0029] Furthermore, the torque compensation value of the engine calculated by the vehicle controller that executes the above-mentioned compensation method is more accurate. After compensating the engine torque using the torque compensation value, a more accurate actual torque of the engine can be obtained, so that the actual torque output of the engine is close to the target torque, thereby optimizing the vehicle's power stability and gear shifting smoothness, and preventing overcharging and over-discharging of the battery.

[0030] Furthermore, the vehicle with the above-mentioned vehicle controller has better power stability and smoother gear shifting due to more precise engine torque compensation, and the battery has a longer service life because it will not be overcharged or over-discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a structural schematic diagram of a drive system in a torque compensation method for an engine provided by an embodiment of the present invention;

[0032] Figure 2 is a schematic flow chart of a torque compensation method for an engine provided by an embodiment of the present invention;

[0033] Figure 3 It is a structural schematic diagram of a clutch in the torque compensation method of an engine provided by an embodiment of the present invention;

[0034] Figure 4 It is a structural schematic diagram of an electromechanical coupling device including a clutch and a gear speed change mechanism in a torque compensation method for an engine provided by an embodiment of the present invention;

[0035] Figure 5 It is a structural schematic diagram of an electromechanical coupling device including a clutch and a planetary gear mechanism in a torque compensation method for an engine provided by an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1. First drive device; 2. Electromechanical coupling device; 3. Second drive device; 4. Clutch; 5. Gear speed change mechanism; 6. Planetary gear mechanism. DETAILED DESCRIPTION

[0038] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0039] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0040] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0042] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] In order to solve the problem in the prior art that inaccurate calculation of the engine torque of a hybrid vehicle affects the driving force or battery, an embodiment of the present invention provides an engine torque compensation method, and the engine torque compensation method is used to compensate the engine torque in the drive system of a hybrid vehicle.

[0045] Further, in the torque compensation method of the engine according to the present invention, referring to Figure 1 , the driving system of the hybrid vehicle includes a first driving device 1, an electromechanical coupling device 2 and a second driving device 3, and the first driving device 1 and the second driving device 3 are respectively connected to the electromechanical coupling device 2. Among them, the first driving device 1 is an engine, and the second driving device 3 is a generator or an electric motor. Specifically, the engine is used to output torque, which can be used for power generation, driving the vehicle or reverse towing the vehicle. The electromechanical coupling device 2 plays the role of connecting the first driving device 1 and the second driving device 3, and transmits the torque of the first driving device 1 to the second driving device 3, or transmits the torque of the second driving device 3 to the first driving device 1. The function of the generator or the electric motor is also to output torque, which can be used for vehicle power generation, vehicle driving or reverse thrust of the engine. More specifically, in this specific embodiment, the input end of the electromechanical coupling device 2 is connected to the first driving device 1, that is, the engine, and the output end is connected to the second driving device 3, that is, the generator or the electric motor.

[0046] Furthermore, in the torque compensation method of the engine according to the present invention, the electromechanical coupling device 2 may be Figure 3 The clutch 4 shown may also be Figure 4 The clutch 4 and the gear transmission mechanism 5 shown can also be Figure 5 The planetary gear mechanism 6 is shown. Electromechanical coupling devices 2 of different structures have different speed ratios between the first drive device 1 and the second drive device 3, that is, the torque transmitted between the engine and the generator or the motor is not in a 1:1 relationship, so the calculated torque compensation value is also different, which will be described in detail later.

[0047] Next, the torque compensation method of the engine provided by this specific embodiment is described. Specifically, refer to Figure 2 The torque compensation method of the engine provided in this specific embodiment includes:

[0048] S1: determining a plurality of temperature measurement points within the full operating temperature range of the engine, determining a plurality of torque measurement points within the full operating torque range of the engine, and arranging and combining each of the plurality of temperature measurement points and each of the plurality of torque measurement points to determine a plurality of measurement operating conditions;

[0049] S2: Cut off the drive system's control over the hybrid vehicle;

[0050] S3: Controlling the engine to operate at a preset speed threshold in each of the multiple measuring conditions, and determining an actual torque of the engine and an actual torque of the generator or the motor in each measuring condition;

[0051] S4: determining a target torque of the engine corresponding to each measurement condition according to an actual torque of the generator or the motor corresponding to each measurement condition in the multiple measurement conditions, and determining a torque compensation value of the engine corresponding to each measurement condition in the multiple measurement conditions according to the target torque of the engine and the actual torque of the engine;

[0052] S5: Obtaining the current temperature and current torque of the engine, determining the current operating condition of the engine according to the current temperature and current torque, and compensating the torque of the engine under the current operating condition according to the torque compensation value corresponding to each measured condition.

[0053] Further, in the torque compensation method of the engine according to the present invention, multiple measurement conditions are determined according to multiple temperature measurement points and torque measurement points of the engine under all working conditions, covering all working conditions of the engine, and the torque within the full operating temperature and torque range can be compensated, with a wider coverage. The torque of the corresponding working condition is compensated according to the determined torque compensation value, without other estimation and prediction, so that the adjusted torque is more accurate. In addition, this scheme uses the torque of the generator or motor to calculate the target torque that the engine needs to output. Since the torque of the generator or motor has high accuracy and good stability, the target torque of the engine calculated by the torque of the generator or motor has high accuracy, so that the torque compensation value finally determined is also more accurate. In addition, after the torque of the engine is compensated by this scheme, a more accurate actual torque of the engine can be obtained, so that the torque actually output by the engine is close to the target torque, thereby optimizing the power stability and gear shifting smoothness of the vehicle, and preventing overcharging and over-discharging of the battery.

[0054] Further, in the torque compensation method of the engine according to the present invention, in step S1, the method for determining multiple temperature measurement points is: determine multiple temperature measurement points according to the minimum temperature, maximum temperature, and temperature sampling step length of the full operating temperature range of the engine. Specifically, the range of the minimum temperature is -35°C to -25°C, for example, it can be -35°C, -30°C, -25°C or other temperature values ​​within the range; the range of the maximum temperature is 85°C to 95°C, for example, it can be 85°C, 90°C, 95°C or other temperature values ​​within the range; the range of the temperature sampling step length is 1°C to 10°C, for example, it can be 1°C, 2.5°C, 5°C, 10°C or other temperature values ​​within the range. Among them, the minimum temperature and the maximum temperature can be determined according to the type and actual operating state of the engine. In this specific implementation, the minimum temperature is -30°C, the maximum temperature is 90°C, and the temperature sampling step length is 10°C as an example for explanation. Under this working condition, the multiple temperature measurement points determined are -30℃, -20℃, -10℃, 0℃, 10℃, 20℃, 30℃, 40℃, 50℃, 60℃, 70℃, 80℃, and 90℃, a total of 13 temperature measurement points. It should be noted that if the torque compensation accuracy needs to be improved, the temperature sampling step can be determined as a smaller value, that is, a temperature measurement point is determined at a smaller temperature difference. In this way, a larger number of temperature measurement points are determined, and the accuracy is higher when performing torque compensation. If it is necessary to speed up the calculation efficiency and save the calculation cost, the temperature sampling step can be determined as a larger value, that is, a temperature measurement point is determined at a larger temperature difference. In this way, fewer temperature measurement points are determined, which can speed up the calculation speed and improve the compensation efficiency.

[0055] Further, in the torque compensation method of the engine according to the present invention, in step S1, the minimum torque, maximum torque, and torque sampling step length of the full operating torque range of the engine determine multiple torque measurement points. Specifically, the range of the minimum torque is 0Nm to 5Nm, for example, it can be 0Nm, 2.5Nm, 5Nm or other torque values ​​within the range; the range of the maximum torque is 245Nm to 255Nm, for example, it can be 245Nm, 250Nm, 255Nm or other torque values ​​within the range; the range of the torque sampling step length is 1Nm to 10Nm, for example, it can be 1Nm, 2.5Nm, 5Nm, 10Nm, or other torque values ​​within the range. Among them, the minimum torque and the maximum torque can be determined according to the type of engine and the actual operating state. In this specific implementation, the minimum torque is 0Nm, the maximum torque is 250Nm, and the torque sampling compensation is 10Nm as an example for explanation. Under this working condition, multiple torque measurement points are determined to be 0Nm, 10Nm, 20Nm...200Nm, 210Nm, 220Nm, 230Nm, 240Nm, 250Nm, a total of 26 torque measurement points. It should be noted that if the torque compensation accuracy needs to be improved, the torque sampling compensation can be determined as a smaller value, that is, a temperature measurement point is determined at every smaller torque difference. In this way, a larger number of torque measurement points are determined, and the accuracy is higher when performing torque compensation. If it is necessary to increase the calculation efficiency and save the calculation cost, the torque sampling step can be determined as a larger value, that is, a torque measurement point is determined at intervals of larger torque differences. In this way, fewer torque measurement points are determined, which can speed up the calculation speed and improve the compensation efficiency.

[0056] Furthermore, in the torque compensation method of the engine according to the present invention, after determining 13 temperature measurement points and 26 torque measurement points according to the above method, all temperature measurement points and all torque measurement points can be arranged and combined to determine 13*26 working conditions. With such a step, since multiple temperature measurement points and multiple torque measurement points are determined under all working conditions of the engine, multiple measurement working conditions are determined based on multiple temperature measurement points and torque measurement points, so that the measurement working conditions basically cover all working conditions of the engine. The torque compensation value is calculated based on the determined multiple measurement working conditions, and the torque of the engine under the corresponding working condition is compensated based on the determined torque compensation value, which can not only compensate the torque within the full operating temperature and torque range of the engine, but also improve the accuracy of compensation.

[0057] Further, in the torque compensation method of the engine according to the present invention, in step S2, cutting off the control of the drive system on the hybrid vehicle includes: switching the gear of the hybrid vehicle to the parking gear or the neutral gear. Specifically, when the gear of the hybrid vehicle is switched to the parking gear or the neutral gear, the drive system will not output torque to the vehicle, and the engine, generator or motor will not affect the measurement of its actual torque and the calculation of the target torque because of the torque output of the vehicle.

[0058] Further, in the torque compensation method of the engine according to the present invention, in step S3, when calculating the torque compensation value under various working conditions, it is necessary to first control the engine to run at a preset speed threshold. The preset speed threshold is arbitrarily selected within the full working speed range of the engine. This specific embodiment is described by taking 1200rpm as an example. The preset speed threshold can be understood as the target speed of the engine.

[0059] Further, in the torque compensation method of the engine according to the present invention, in step S3, the actual torque of the engine under each measurement condition and the actual torque of the generator or motor are determined, including: first, the actual torque of the engine output at the lowest torque of the engine and the actual torque of the generator or motor are determined at each temperature measurement point of the multiple temperature measurement points; then, the torque of the engine is controlled to start from the lowest torque and increase to the highest torque with a torque sampling step, and the actual torque of the engine output corresponding to each torque measurement point and the actual torque of the generator or motor are measured. That is to say, in this specific embodiment, it is necessary to determine the actual torque of the engine output and the actual torque of the generator or motor output at 13 temperature measurement points of the engine when the engine runs at a target speed of 1200rpm and a torque of 0Nm. Then, every torque sampling step, that is, 10Nm, the actual torque of the engine output and the actual torque of the generator or motor output are determined at 13 temperature measurement points when the engine runs at a target speed of 1200rpm and a torque of 10Nm. By analogy, the actual torque output by the engine and the actual torque output by the generator or motor are determined when the engine is running at the target speed of 1200 rpm and the torque value of 26 torque measurement points at 13 temperature measurement points. The target torque required to be output by the engine is calculated by using the output torque of the generator or motor. Since the torque of the generator or motor has high precision and good stability, the target torque of the engine calculated by the torque of the generator or motor has high accuracy, so that the torque compensation value finally determined is also more accurate.

[0060] Further, in the torque compensation method of the engine according to the present invention, before measuring the actual torque output by the engine corresponding to each torque point, and the actual torque output by the generator or the motor, it also includes: waiting for a preset time range. Specifically, the preset time range is 10s to 20s, for example, it can be 10s, 15s, 20s or other values ​​within the range. This specific implementation is described by taking 15s as an example. That is to say, in this specific implementation, it is necessary to wait for 15s every time the torque increases by the torque value corresponding to the torque sampling step. With such a step, after the torque of the engine changes, waiting for a period of time can make the torque of the generator or the motor tend to stabilize, and prevent measurement errors caused by torque fluctuations, thereby causing the problem of inaccurate calculated torque compensation values.

[0061] Further, in the torque compensation method of the engine according to the present invention, in step S4, the torque compensation value of the engine is determined according to the following formula:

[0062] Δ T =TEM-TEng

[0063] Among them, Δ T is the torque compensation value of the engine, TEM is the target torque of the engine, and TEng is the actual torque of the engine. It should be noted that the target torque of the engine is converted according to the actual torque value of the generator or motor. The conversion method of the target torque of the engine is different for electromechanical coupling devices of different structures. The structures of three different electromechanical coupling devices are described in detail below.

[0064] The first one, reference Figure 3 When the electromechanical coupling device 2 is a clutch 4, the preset speed threshold is the target speed of the engine. Under this structure, the target torque of the engine obtained after conversion is TEM.

[0065] The second one, reference Figure 4 When the electromechanical coupling device 2 includes a clutch 4 and a gear transmission mechanism 5, the speed ratio between the engine and the generator or the motor is the first speed ratio i1; and the preset speed threshold is the ratio of the target speed of the engine to the first speed ratio, i.e., 1200 / i1. Under this structure, the target torque of the engine after conversion is TEM / i1

[0066] The third one, reference Figure 5 , when the electromechanical coupling device 2 is a planetary gear mechanism 6, the speed ratio between the engine and the generator or the motor is the second speed ratio i2; the preset speed threshold is the ratio of the target speed of the engine to the second speed ratio, i.e., 1200 / i2. Under this structure, the target torque of the engine obtained after conversion is TEM / i2.

[0067] Based on the above-mentioned engine torque compensation method, an embodiment of the present invention also provides a vehicle controller, including a memory and a processor. The memory is used to store a control program; the processor executes the steps of the engine torque compensation method described in the above embodiment when processing the control program. With such a structure, since the vehicle controller executes the steps of the above-mentioned engine torque compensation method when processing the program, the calculated engine torque compensation value is more accurate. After compensating the engine torque with the torque compensation value, a more accurate actual engine torque can be obtained, so that the actual output torque of the engine approaches the target torque, thereby optimizing the vehicle's power stability and gear shifting smoothness, and preventing overcharging and over-discharging of the battery.

[0068] Based on the above vehicle controller, an embodiment of the present invention further provides a vehicle, including the vehicle controller described in the above embodiment. With such a structure, since the vehicle has the above vehicle controller, the accuracy of the actual torque of the engine is higher, and the actual torque output of the engine is close to the target torque, thereby optimizing the power stability and gear shifting smoothness of the vehicle, and preventing overcharging and over-discharging of the battery.

[0069] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A method for compensating engine torque, characterized in that: Used to compensate for the torque of an engine in a drive system of a hybrid vehicle, the drive system comprising a first drive device, an electromechanical coupling device, and a second drive device, the first drive device and the second drive device being connected to the electromechanical coupling device respectively; in The first driving device is an engine, and the second driving device is a generator or an electric motor; and The torque compensation method comprises: S1: determining a plurality of temperature measurement points within the full operating temperature range of the engine, determining a plurality of torque measurement points within the full operating torque range of the engine, and arranging and combining each of the plurality of temperature measurement points and each of the plurality of torque measurement points to determine a plurality of measurement operating conditions; S2: Cutting off the control of the hybrid vehicle by the drive system; S3: Controlling the engine to operate at a preset speed threshold in each of the plurality of measurement conditions, and determining an actual torque of the engine and an actual torque of the generator or the motor in each of the measurement conditions, including: determining an actual torque output by the engine at a minimum torque of the engine and an actual torque output by the generator or the motor at each of the plurality of temperature measurement points; Controlling the torque of the engine to start from the lowest torque and increase to the highest torque with a torque sampling step; waiting for a preset time range so that the torque of the generator or the motor tends to be stable; and measuring the actual torque output by the engine corresponding to each torque measurement point, and the actual torque output by the generator or the motor; S4: determining a target torque of the engine corresponding to each of the multiple measuring conditions according to the actual torque of the generator or the motor corresponding to each of the multiple measuring conditions, and determining a torque compensation value of the engine corresponding to each of the multiple measuring conditions according to the target torque of the engine and the actual torque of the engine; S5: Acquire the current temperature and current torque of the engine, determine the current operating condition of the engine according to the current temperature and the current torque, and compensate the torque of the engine under the current operating condition according to the torque compensation value corresponding to each measured condition.

2. The engine torque compensation method according to claim 1, characterized in that: In the step S1, the plurality of temperature measurement points are determined according to the lowest temperature, the highest temperature, and the temperature sampling step length of the full operating temperature range of the engine; in The minimum temperature range is -35°C to -25°C; The maximum temperature ranges from 85°C to 95°C; The temperature sampling step ranges from 1°C to 10°C; and Determining the plurality of torque measurement points according to the lowest torque, the highest torque, and the torque sampling step length of the full operating torque range of the engine; in The minimum torque ranges from 0Nm to 5Nm; The maximum torque ranges from 245Nm to 255Nm; The torque sampling step ranges from 1 Nm to 10 Nm.

3. The engine torque compensation method according to claim 2, characterized in that: In the step S2, cutting off the control of the hybrid vehicle by the drive system includes: The gear position of the hybrid vehicle is switched to a parking gear or a neutral gear.

4. The method for compensating engine torque as claimed in claim 3, characterized in that: The preset time range is 10s to 20s; and In step S4, the torque compensation value of the engine is determined according to the following formula: Δ T =TEM-TEng Among them, Δ T is the torque compensation value of the engine, TEM is the target torque of the engine, and TEng is the actual torque of the engine.

5. The engine torque compensation method according to claim 4, characterized in that: The input end of the electromechanical coupling device is connected to the output end of the engine, and the output end is connected to the generator or the motor; and The electromechanical coupling device is a clutch; The preset speed threshold is the target speed of the engine.

6. The method for compensating engine torque as claimed in claim 4, characterized in that: The input end of the electromechanical coupling device is connected to the output end of the engine, and the output end is connected to the generator or the motor; and The electromechanical coupling device includes a clutch and a gear speed change mechanism, and the speed ratio between the engine and the generator or the motor is a first speed ratio; and The preset speed threshold is a ratio of the target speed of the engine to the first speed ratio.

7. The engine torque compensation method according to claim 4, characterized in that: The input end of the electromechanical coupling device is connected to the output end of the engine, and the output end is connected to the generator or the motor; and The electromechanical coupling device is a planetary gear mechanism, and the speed ratio between the engine and the generator or the motor is a second speed ratio; The preset speed threshold is a ratio of the target speed of the engine to the second speed ratio.

8. A vehicle controller, characterized in that: include: A memory, wherein the memory is used to store a control program; A processor, wherein when processing the control program, the processor executes the steps of the engine torque compensation method as described in any one of claims 1-7.

9. A vehicle, characterized in that: Including the vehicle controller as claimed in claim 8.

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