Control method, system, motor and engine for engine heating mode

Abstract

The application relates to the technical field of engines and provides an engine heating mode control method, system, motor and engine, which comprises the following steps: in the heating mode, acquiring an engine demand rotating speed, an engine demand torque and a battery power under a current working condition; determining an initial torque compensation value based on the engine demand rotating speed and the engine demand torque, determining a torque compensation coefficient based on the battery power, and taking the product of the initial torque compensation value and the torque compensation coefficient as the torque compensation value; and correcting a motor demand torque through the torque compensation value to control the torque generated by the motor. The application does not cause torque instability, increases stability, and solves the problem of heating mode torque instability.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, and particularly relates to a control method, system, motor, and engine for engine heating modes. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Harmful gases emitted by an engine are released through three pathways. First, through the exhaust pipe, where approximately 99% of CO, 99% of NOx, and 60% of HC are emitted. Second, through the crankcase, where approximately 1% of CO, 1% of NOx, and 20% of HC are released via crankcase blow-by. Third, through fuel evaporation, where approximately 20% of HC is released.

[0004] When the engine is under low load, the aftertreatment exhaust temperature is low. To meet emission requirements and reduce carbon emissions, one engine control strategy is to activate a heating mode, which increases the fuel injection quantity so that some fuel is burned in the exhaust pipe, thus reducing carbon emissions. Another method is to increase exhaust volume to ensure complete combustion of fuel and reduce carbon emissions, but this can lead to excessive fuel dilution.

[0005] However, the first heating mode increases the amount of fuel injected into the engine, resulting in increased engine power, which leads to unstable vehicle torque. Furthermore, the engine consumes more fuel and has lower thermal efficiency in the heating mode. Summary of the Invention

[0006] To address the technical problems existing in the background art, the present invention provides a control method, system, motor, and engine for engine heating mode. By using a motor to adjust torque, torque instability is avoided, thus increasing stability and solving the problem of torque instability in heating mode.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A first aspect of the present invention provides a method for controlling an engine heating mode, comprising:

[0009] In heating mode, obtain the engine speed, engine torque, and battery charge under the current operating conditions;

[0010] Based on the engine's required speed and torque, the initial torque compensation value is determined, and based on the battery charge, the torque compensation coefficient is determined. The product of the initial torque compensation value and the torque compensation coefficient is used as the torque compensation value.

[0011] The torque generated by the motor is controlled by correcting the required torque of the motor through torque compensation value.

[0012] Furthermore, based on the engine's required torque and engine's required speed, the engine operating point is determined, the difference between the optimal operating point range and the engine operating point is calculated, and the initial torque compensation value is determined.

[0013] Furthermore, if the battery charge exceeds a limit, the required motor torque will not be adjusted; the limit is the allowable charging capacity set according to the battery SOC protection.

[0014] Furthermore, the lower the battery charge, the higher the torque compensation coefficient.

[0015] Furthermore, the required torque of the motor is corrected by subtracting the torque compensation value from the required torque of the motor.

[0016] A second aspect of the invention provides a control system for an engine heating mode, comprising:

[0017] The data acquisition module is configured to acquire the engine speed, engine torque, and battery charge under the current operating conditions in heating mode.

[0018] The torque compensation value calculation module is configured to: determine the initial torque compensation value based on the engine demand speed and engine demand torque, and determine the torque compensation coefficient based on the battery charge, and use the product of the initial torque compensation value and the torque compensation coefficient as the torque compensation value.

[0019] The correction module is configured to correct the required torque of the motor by using a torque compensation value in order to control the torque generated by the motor.

[0020] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the engine heating mode control method described above.

[0021] A fourth aspect of the present invention provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps in the engine heating mode control method described above.

[0022] A fifth aspect of the present invention provides an electric motor utilizing a control method for an engine heating mode as described in the first aspect; or utilizing a control system for an engine heating mode as described in the second aspect; or utilizing a computer-readable storage medium as described in the third aspect; or utilizing a computer device as described in the fourth aspect.

[0023] A sixth aspect of the present invention provides an engine utilizing a control method for an engine heating mode as described in the first aspect; or utilizing a control system for an engine heating mode as described in the second aspect; or utilizing a computer-readable storage medium as described in the third aspect; or utilizing a computer device as described in the fourth aspect; or connected to an electric motor as described in the fifth aspect.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This invention provides a control method for engine heating mode, which uses a motor to adjust torque, thus avoiding torque instability, increasing stability, and solving the problem of torque instability in heating mode.

[0026] This invention provides a control method for engine heating mode, in which torque adjustment utilizes electric motor to generate electricity, which can charge the battery and reduce energy loss.

[0027] This invention provides a method for controlling the engine heating mode, which can increase the engine load by increasing torque, reduce the duration of the heating mode, and reduce fuel consumption. Attached Figure Description

[0028] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0029] Figure 1 This is a flowchart of the engine heating mode control method according to Embodiment 1 of the present invention. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0032] In this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Terminology Explanation:

[0034] SOC (State of charge) is used to reflect the remaining capacity of a battery.

[0035] Torque: A special type of torque that causes an object to rotate. Engine torque refers to the torque output from the crankshaft of the engine. Motor torque is the output torque of an electric motor, and it is related to the motor's output power.

[0036] Example 1

[0037] This embodiment provides a method for controlling the engine heating mode.

[0038] The engine heating mode control method provided in this embodiment adjusts the torque of the motor based on the heating mode, thereby solving the problems of unstable torque and high engine fuel consumption in the heating mode.

[0039] The engine heating mode control method provided in this embodiment obtains the engine demand speed, engine demand torque, and battery charge under the current operating conditions in the heating mode; determines the initial torque compensation value based on the engine demand speed and engine demand torque, and determines the torque compensation coefficient based on the battery charge; and uses the product of the initial torque compensation value and the torque compensation coefficient as the torque compensation value; and corrects the motor demand torque through the torque compensation value to control the torque generated by the motor.

[0040] As one implementation method, the engine operating point is determined based on the engine's required torque and engine's required speed, the difference between the optimal operating point range and the engine operating point is calculated, and the initial torque compensation value is determined.

[0041] In one implementation, if the battery charge exceeds a limit, the required motor torque is not corrected; the limit is the allowable charging capacity set according to the battery SOC protection.

[0042] As one implementation method, the lower the battery charge, the higher the torque compensation coefficient.

[0043] As one implementation method, the required torque of the motor is corrected by subtracting the torque compensation value from the required torque of the motor.

[0044] The engine heating mode control method provided in this embodiment, such as Figure 1 As shown, it includes:

[0045] Step 1: In heating mode, obtain the engine speed and torque required under the current operating conditions, and determine the initial torque compensation value suitable for the current operating conditions based on the engine speed and torque required.

[0046] Specifically, the current engine operating point is determined based on the engine's required torque and engine's required speed. Then, based on the optimal operating point range obtained from experiments under the engine's heating mode, the difference between the optimal operating point range and the current engine operating point is calculated to determine the initial torque compensation value.

[0047] Step 2: Obtain the battery level and determine whether it is permissible to use the motor for charging based on the current battery level. If charging is permissible, select an appropriate torque compensation coefficient based on the current battery level.

[0048] If the battery charge exceeds the limit, the required motor torque will not be adjusted. Specifically, the allowable charging capacity set by the battery SOC protection is used as the limit. If the SOC protection setting disallows charging when the SOC is higher than 90%, this function will not be activated if the current SOC value is higher than 90%.

[0049] The lower the battery charge, the higher the torque compensation coefficient. Specifically, if the current SOC value is low and fast charging is required, a large compensation coefficient is selected to keep the engine speed at the maximum allowable speed within the optimal operating range. If the SOC value is high, the compensation coefficient is 1, meaning no compensation is applied.

[0050] Step 3: Multiplying the initial torque compensation value by the torque compensation coefficient gives the final motor torque compensation value. The calculated motor torque demand is corrected by the motor torque compensation value to control the torque generated by the motor and increase the torque. This increases the engine load rate and reduces the duration of the heating mode, thereby reducing fuel consumption. At the same time, the motor can charge the battery and reduce energy loss when adjusting the torque.

[0051] As one implementation method, the required torque of the motor under the current operating conditions is estimated based on the current gear, vehicle speed, vehicle weight and slope. The required torque of the motor is then corrected by subtracting the final motor torque compensation value from the required torque of the motor. Since the total required torque of the vehicle is constant, the engine torque can be increased by increasing the negative torque generated by the motor.

[0052] This embodiment does not require any other devices. The original heating mode only controls the engine to increase fuel injection without controlling the motor. This embodiment increases the negative torque generated by the motor, thereby increasing the engine load. The motor can be reversed to achieve charging.

[0053] When the vehicle is distributing torque, the motor's power generation can be modified based on the heating mode to increase the engine load rate and shorten the duration of the heating mode.

[0054] The engine heating mode control method provided in this embodiment uses a motor to adjust torque, which avoids torque instability, increases stability, and solves the problem of unstable torque in the heating mode. When adjusting the torque, the motor generates electricity, which can charge the battery and reduce energy loss. By increasing the torque, the engine load can be increased, the heating mode duration can be reduced, and fuel consumption can be reduced.

[0055] Example 2

[0056] This embodiment provides a control system for the engine heating mode, which specifically includes:

[0057] The data acquisition module is configured to acquire the engine speed, engine torque, and battery charge under the current operating conditions in heating mode.

[0058] The torque compensation value calculation module is configured to: determine the initial torque compensation value based on the engine demand speed and engine demand torque, and determine the torque compensation coefficient based on the battery charge, and use the product of the initial torque compensation value and the torque compensation coefficient as the torque compensation value.

[0059] The correction module is configured to correct the motor's required torque using a torque compensation value.

[0060] Specifically, based on the engine's required torque and engine's required speed, the engine operating point is determined, the difference between the optimal operating point range and the engine operating point is calculated, and the initial torque compensation value is determined to control the torque generated by the motor.

[0061] If the battery charge exceeds the limit, the required motor torque will not be adjusted.

[0062] The limit value is the allowable charging capacity set according to the battery SOC protection.

[0063] The lower the battery charge, the higher the torque compensation coefficient.

[0064] Specifically, the required torque of the motor is corrected by subtracting the torque compensation value from the required torque of the motor.

[0065] As one implementation method, the required torque of the motor under the current operating conditions is estimated based on the current gear, vehicle speed, vehicle weight and slope. The required torque of the motor is then corrected by subtracting the final motor torque compensation value from the required torque of the motor. Since the total required torque of the vehicle is constant, the engine torque can be increased by increasing the negative torque generated by the motor.

[0066] This embodiment does not require any other devices. The original heating mode only controls the engine to increase fuel injection without controlling the motor. This embodiment increases the negative torque generated by the motor, thereby increasing the engine load. The motor can be reversed to achieve charging.

[0067] The engine heating mode control system provided in this embodiment uses a motor to adjust torque, which does not cause torque instability, increases stability, and solves the problem of unstable torque in the heating mode. When adjusting the torque, the motor generates electricity, which can charge the battery and reduce energy loss. By increasing the torque, the engine load can be increased, the heating mode duration can be reduced, and fuel consumption can be reduced.

[0068] It should be noted that each module in this embodiment corresponds one-to-one with each step in Embodiment 1, and their specific implementation processes are the same, so they will not be repeated here.

[0069] Example 3

[0070] This embodiment provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the engine heating mode control method as described in Embodiment 1 above.

[0071] Example 4

[0072] This embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps in the engine heating mode control method described in Embodiment 1 above.

[0073] Example 5

[0074] This embodiment provides an electric motor that utilizes the engine heating mode control method described in Embodiment 1; or, utilizes the engine heating mode control system described in Embodiment 2; or, utilizes a computer-readable storage medium described in Embodiment 3; or, utilizes a computer device described in Embodiment 4.

[0075] Example 6

[0076] This embodiment provides an engine that utilizes the engine heating mode control method described in Embodiment 1 above; or, utilizes the engine heating mode control system described in Embodiment 2 above; or, utilizes a computer-readable storage medium described in Embodiment 3 above; or, utilizes a computer device described in Embodiment 4 above; or, is connected to a motor described in Embodiment 5 above.

[0077] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0078] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0079] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0080] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0081] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0082] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling engine heating mode, characterized in that, include: In heating mode, obtain the engine speed, engine torque, and battery charge under the current operating conditions; Based on the required engine speed and required engine torque, the engine operating point is determined, the difference between the optimal operating point range and the engine operating point is calculated, the initial torque compensation value is determined, and the torque compensation coefficient is determined based on the battery charge. The product of the initial torque compensation value and the torque compensation coefficient is used as the torque compensation value. The torque generated by the motor is controlled by correcting the required torque of the motor through torque compensation value.

2. The engine heating mode control method as described in claim 1, characterized in that, If the battery charge exceeds the limit, the required motor torque will not be adjusted; the limit is the allowable charging capacity set according to the battery SOC protection.

3. The engine heating mode control method as described in claim 1, characterized in that, The lower the battery charge, the higher the torque compensation coefficient.

4. The engine heating mode control method as described in claim 1, characterized in that, The required torque of the motor is corrected by subtracting the torque compensation value from the required torque of the motor.

5. A control system for an engine heating mode, employing the engine heating mode control method as described in any one of claims 1-4, characterized in that, include: The data acquisition module is configured to acquire the engine speed, engine torque, and battery charge under the current operating conditions in heating mode. The torque compensation value calculation module is configured to: determine the initial torque compensation value based on the engine demand speed and engine demand torque, and determine the torque compensation coefficient based on the battery charge, and use the product of the initial torque compensation value and the torque compensation coefficient as the torque compensation value. The correction module is configured to correct the required torque of the motor by using a torque compensation value in order to control the torque generated by the motor.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps in the control method for the engine heating mode as described in any one of claims 1-4.

7. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the engine heating mode control method as described in any one of claims 1-4.

8. An electric motor, characterized in that: The method for controlling an engine heating mode as described in any one of claims 1-4; or the control system for an engine heating mode as described in claim 5; or a computer-readable storage medium as described in claim 6; Alternatively, using a computer device as described in claim 7.

9. An engine, characterized in that: The method for controlling an engine heating mode as described in any one of claims 1-4; or the control system for an engine heating mode as described in claim 5; or a computer-readable storage medium as described in claim 6; Alternatively, using a computer device as described in claim 7; or connecting to a motor as described in claim 8.

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