An internal combustion engine operating point calibration method, system, device and storage medium

Abstract

This invention discloses a method, system, device, and storage medium for calibrating the operating point of an internal combustion engine, belonging to the field of internal combustion engine calibration technology. The calibration method involves: acquiring universal data of the internal combustion engine and efficiency data of the P2 motor; performing linear interpolation at preset parameter intervals to preprocess the universal data to obtain target data; selecting the point with the highest thermal efficiency at each speed of the internal combustion engine as the economic point, and plotting economic curves based on these economic points across all speeds; calculating the benefit of the internal combustion engine operating at each operating point according to preset step sizes and combining it with the efficiency data of the P2 motor; if the benefit > 0, it indicates that the internal combustion engine is not suitable for directly driving the vehicle at this operating point, and the operating point of the internal combustion engine is changed to the economic point at the corresponding speed, with the excess power used to generate electricity for the P2 motor; if the benefit ≤ 0, it indicates that the overall benefit of the internal combustion engine directly driving the vehicle is greater at this operating point, and this operating point is taken as the operating point of the internal combustion engine, with all power used for direct driving of the vehicle.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine calibration technology, and more specifically, to a method, system, device, and storage medium for calibrating the operating point of an internal combustion engine suitable for a P2 hybrid power system. Background Technology

[0002] In the P2 hybrid system, when the vehicle is in motion and the battery charge is low, the system can engage the clutch, allowing the engine to directly drive the vehicle while simultaneously powering the P2 motor to enter power generation mode and charge the battery.

[0003] Currently, the system simply charges the battery when it is low without considering operating conditions and fuel consumption, which leads to high engine fuel consumption and poor fuel economy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a method for calibrating the operating point of an internal combustion engine, which can determine the optimal operating point under different operating conditions, so that the internal combustion engine can reduce fuel consumption and improve economy when it operates at the optimal operating point.

[0005] The second objective of this invention is to provide a system for calibrating the operating point of an internal combustion engine.

[0006] The third objective of this invention is to provide a computer device.

[0007] The fourth objective of this invention is to provide a computer storage medium.

[0008] To achieve the first objective mentioned above, the present invention provides a method for calibrating the operating point of an internal combustion engine, comprising the following steps: Step S1. Obtain the universal data of the internal combustion engine and the efficiency data of the P2 motor; Step S2. Perform linear interpolation at preset parameter intervals to preprocess the universal data and obtain target data with a preset step size; Step S3. Select the point with the highest thermal efficiency at each speed of the internal combustion engine as the economic point, and draw an economic curve based on the economic points at all speeds; Step S4. Sequentially calculate the benefits of the internal combustion engine working at each operating point according to the preset step size, and combine the efficiency data of the P2 motor. If the profit is greater than 0, it means that the internal combustion engine is not suitable for directly driving the vehicle at this operating point. The operating point of the internal combustion engine is changed to the economic point at the corresponding speed of this operating point, and the excess power is used to generate electricity for the P2 motor. If the profit is ≤0, it means that the overall profit of the direct-drive vehicle of the internal combustion engine is greater at this operating point. This operating point is taken as the operating point of the internal combustion engine, and all power is used for the direct-drive vehicle.

[0009] As a further improvement, the benefits of the internal combustion engine operating at this condition point are calculated as follows:

[0010]

[0011]

[0012] in, For total revenue, Benefits from the direct drive portion used for charging the vehicle. Revenue from charging for vehicle operation. For direct drive power requirements, This is the surplus power used for charging while the vehicle is in motion. For direct drive, fuel consumption is higher. Charging your car while driving consumes less fuel. Motor charging efficiency during vehicle charging. This represents the average drive efficiency of the motor. Improve battery charging efficiency. This refers to the battery discharge efficiency.

[0013] Furthermore, based on the profitability at each operating point, inefficient areas are mapped to provide guidance for the development of dedicated hybrid internal combustion engines.

[0014] Furthermore, different colors are used to represent different inefficient areas, with darker colors indicating lower returns.

[0015] Furthermore, the operating points with preset step sizes are sequentially calculated with different torque operating points at corresponding speeds to obtain the operating point with the greatest overall benefit.

[0016] Furthermore, plot the point of maximum benefit and the operating point without adjustment at this speed, and use different colors to distinguish the point of maximum benefit and the operating point without adjustment.

[0017] Furthermore, steps S1 to S4 are executed in the vehicle controller to adjust the operating points of the internal combustion engine and P2 motor in real time according to the current vehicle driving conditions, so as to maximize the economic benefits of the whole vehicle.

[0018] To achieve the second objective mentioned above, the present invention provides an internal combustion engine operating point calibration system, comprising: The acquisition module is used to acquire universal data of the internal combustion engine and efficiency data of the P2 motor; The preprocessing module is used to perform linear interpolation at preset parameter intervals to preprocess the universal data and obtain target data with a preset step size. The economic curve module is used to select the point with the highest thermal efficiency at each speed of the internal combustion engine as the economic point, and to draw an economic curve based on the economic points at all speeds. The calculation module is used to calculate the benefits of the internal combustion engine working at the operating point according to the operating point with a preset step size, and in combination with the efficiency data of the P2 motor. If the profit is greater than 0, it means that the internal combustion engine is not suitable for directly driving the vehicle at this operating point. The operating point of the internal combustion engine is changed to the economic point at the corresponding speed of this operating point, and the excess power is used to generate electricity for the P2 motor. If the profit is ≤0, it means that the overall profit of the direct-drive vehicle of the internal combustion engine is greater at this operating point. This operating point is taken as the operating point of the internal combustion engine, and all power is used for the direct-drive vehicle.

[0019] To achieve the third objective mentioned above, the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the above-mentioned method for calibrating the operating point of an internal combustion engine.

[0020] To achieve the fourth objective mentioned above, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the above-described method for calibrating the operating point of an internal combustion engine.

[0021] Beneficial effects Compared with the prior art, the advantages of this invention are as follows: Existing technologies simply charge the battery when it's low, without considering operating conditions and fuel consumption, leading to high engine fuel consumption and poor fuel economy. This invention first preprocesses universal data, selecting the point with the highest thermal efficiency at each speed as the economic point. Then, it sequentially calculates the benefits of the internal combustion engine operating at each operating point according to a preset step size, combining this with the efficiency data of the P2 motor. If the benefit > 0, it means that the internal combustion engine is not suitable for directly driving the vehicle at that operating point, and the engine's operating point is changed to the economic point at the corresponding speed, with excess power used to generate electricity for the P2 motor. If the benefit ≤ 0, it means that the overall benefit of the internal combustion engine directly driving the vehicle is greater at that operating point, and this operating point is selected as the engine's operating point, with all power used for direct driving. This invention aims at overall benefit and determines the operating point of the internal combustion engine based on the benefit of the operating point. Instead of immediately charging the battery when the battery power is low, it uses the excess power to generate electricity for the P2 motor when the operating point is at the economic point, so as to maximize the overall benefit of the vehicle. In other words, it can achieve the goal of low fuel consumption and the best economy. Attached Figure Description

[0022] Figure 1 This is a flowchart of the present invention; Figure 2Map of inefficient regions; Figure 3 The diagram shows the point of maximum benefit without any adjustments to the operating conditions. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0024] See Figures 1-3 A method for calibrating the operating point of an internal combustion engine includes the following steps: Step S1. Obtain the universal data of the internal combustion engine and the efficiency data of the P2 motor; Step S2. Perform linear interpolation at preset parameter intervals to preprocess the universal data and obtain target data with a preset step size; Step S3. Select the point with the highest thermal efficiency at each speed of the internal combustion engine as the economic point, and draw the economic curve based on the economic points at all speeds; Step S4. Sequentially calculate the benefits of the internal combustion engine working at each operating point according to the preset step size, and combine the efficiency data of the P2 motor. If the profit is greater than 0, it means that the internal combustion engine is not suitable for directly driving the vehicle at this operating point. The operating point of the internal combustion engine should be changed to the economic point at the corresponding speed of this operating point, and the excess power should be used to generate electricity for the P2 motor. If the profit is ≤0, it means that the overall profit of the direct-drive vehicle is greater at this operating point. This operating point is taken as the operating point of the internal combustion engine, and all power is used for the direct-drive vehicle. As shown in Table 1 below.

[0025]

[0026] Table 1 Specifically, the benefits of the internal combustion engine operating at this condition point are calculated as follows:

[0027]

[0028]

[0029] in, For total revenue, Benefits from the direct drive portion used for charging the vehicle. Revenue from charging for vehicle operation. For direct drive power requirements, This is the surplus power used for charging while the vehicle is in motion. For direct drive, fuel consumption is higher. Charging your car while driving consumes less fuel. Motor charging efficiency during vehicle charging. This represents the average drive efficiency of the motor. Improve battery charging efficiency. This refers to the battery discharge efficiency.

[0030] Existing technologies simply charge the battery when it's low, without considering operating conditions and fuel consumption, leading to high engine fuel consumption and poor fuel economy. This invention first preprocesses universal data, selecting the point with the highest thermal efficiency at each speed as the economic point. Then, it sequentially calculates the benefits of the internal combustion engine operating at each operating point according to a preset step size, combining this with the efficiency data of the P2 motor. If the benefit > 0, it means that the internal combustion engine is not suitable for directly driving the vehicle at that operating point, and the engine's operating point is changed to the economic point at the corresponding speed, with excess power used to generate electricity for the P2 motor. If the benefit ≤ 0, it means that the overall benefit of the internal combustion engine directly driving the vehicle is greater at that operating point, and this operating point is selected as the engine's operating point, with all power used for direct driving. This invention aims at overall benefit and determines the operating point of the internal combustion engine based on the benefit of the operating point. Instead of immediately charging the battery when the battery power is low, it uses the excess power to generate electricity for the P2 motor when the operating point is at the economic point, so as to maximize the overall benefit of the vehicle. In other words, it can achieve the goal of low fuel consumption and the best economy.

[0031] In this embodiment, inefficient regions are plotted based on the profitability at each operating point. The location of these inefficient regions can provide guidance for the development of hybrid-specific internal combustion engines. Different colors can be used to represent different inefficient regions, with darker colors indicating lower profitability. Figure 2 As shown, the red area represents the inefficient area, and the darker the color, the lower the return.

[0032] In this embodiment, further, the operating points are sequentially calculated with different torque operating points at corresponding speeds according to a preset step size, to obtain the operating point with the greatest overall benefit. That is, it calculates the operating point at which the overall benefit is maximized. A graph is plotted showing the point with the greatest benefit at that speed and the operating point without adjustment, using different colors to distinguish between the point with the greatest benefit and the operating point without adjustment. Figure 3 As shown, the location of the point with the greatest benefit is indicated by the green dot, while the red dot represents the point where no adjustment is made to the operating condition. Direct drive of internal combustion engines yields higher benefits, which is very intuitive and convenient.

[0033] Furthermore, steps S1 to S4 can be programmed and integrated into the vehicle controller. Steps S1 to S4 are executed in the vehicle controller to adjust the operating points of the internal combustion engine and P2 motor in real time according to the current vehicle driving conditions, thereby maximizing the economic benefits of the whole vehicle and making it more adaptable.

[0034] A system for measuring friction and accessory losses in an internal combustion engine, comprising: The acquisition module is used to acquire universal data of the internal combustion engine and efficiency data of the P2 motor; The preprocessing module is used to perform linear interpolation at preset parameter intervals to preprocess the universal data and obtain target data with a preset step size. The Economy Curve module is used to select the point with the highest thermal efficiency at each speed of the internal combustion engine as the economy point, and to draw the economy curve based on the economy points at all speeds. The calculation module is used to calculate the benefits of the internal combustion engine working at each operating point according to a preset step size, and in combination with the efficiency data of the P2 motor. If the profit is greater than 0, it means that the internal combustion engine is not suitable for directly driving the vehicle at this operating point. The operating point of the internal combustion engine should be changed to the economic point at the corresponding speed of this operating point, and the excess power should be used to generate electricity for the P2 motor. If the profit is ≤0, it means that the overall profit of the direct-drive vehicle is greater at this operating point. This operating point is taken as the operating point of the internal combustion engine, and all power is used for the direct-drive vehicle.

[0035] A computer device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the above-described method for calibrating the operating point of an internal combustion engine.

[0036] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described method for calibrating the operating point of an internal combustion engine.

[0037] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for calibrating the operating point of an internal combustion engine, characterized in that, Includes the following steps: Step S1. Obtain the universal data of the internal combustion engine and the efficiency data of the P2 motor; Step S2. Perform linear interpolation at preset parameter intervals to preprocess the universal data and obtain target data with a preset step size; Step S3. Select the point with the highest thermal efficiency at each speed of the internal combustion engine as the economic point, and draw an economic curve based on the economic points at all speeds; Step S4. Sequentially calculate the benefits of the internal combustion engine working at each operating point according to the preset step size, and combine the efficiency data of the P2 motor. If the profit is greater than 0, it means that the internal combustion engine is not suitable for directly driving the vehicle at this operating point. The operating point of the internal combustion engine is changed to the economic point at the corresponding speed of this operating point, and the excess power is used to generate electricity for the P2 motor. If the profit is ≤0, it means that the overall profit of the direct-drive vehicle of the internal combustion engine is greater at this operating point. This operating point is taken as the operating point of the internal combustion engine, and all power is used for the direct-drive vehicle.

2. The method for calibrating the operating point of an internal combustion engine according to claim 1, characterized in that, The benefits of the internal combustion engine operating at this condition are calculated as follows: in, For total revenue, Benefits from the direct drive portion used for charging the vehicle. Revenue from charging for vehicle use. For direct drive power requirements, This is the surplus power used for charging while the vehicle is in motion. For direct drive, fuel consumption is higher. Charging your car while driving consumes less fuel. Motor charging efficiency during vehicle charging. This represents the average drive efficiency of the motor. Improve battery charging efficiency. This refers to the battery discharge efficiency.

3. The method for calibrating the operating point of an internal combustion engine according to claim 1, characterized in that, Based on the profitability of each operating point, inefficient areas are plotted to provide guidance for the development of dedicated internal combustion engines for hybrid vehicles.

4. The method for calibrating the operating point of an internal combustion engine according to claim 3, characterized in that, Different colors are used to represent different inefficient areas, with darker colors indicating lower returns.

5. The method for calibrating the operating point of an internal combustion engine according to claim 1, characterized in that, The operating point with the preset step size is calculated sequentially with different torque operating points at the corresponding speed to obtain the operating point with the greatest overall benefit.

6. The method for calibrating the operating point of an internal combustion engine according to claim 5, characterized in that, Plot the points of maximum benefit and the operating point without adjustment at that speed, and use different colors to distinguish between the points of maximum benefit and the operating point without adjustment.

7. The method for calibrating the operating point of an internal combustion engine according to claim 1, characterized in that, Steps S1 to S4 are executed in the vehicle controller to adjust the operating points of the internal combustion engine and P2 motor in real time according to the current vehicle driving conditions, so as to maximize the economic benefits of the whole vehicle.

8. An internal combustion engine operating point calibration system, characterized in that, include: The acquisition module is used to acquire universal data of the internal combustion engine and efficiency data of the P2 motor; The preprocessing module is used to perform linear interpolation at preset parameter intervals to preprocess the universal data and obtain target data with a preset step size. The economic curve module is used to select the point with the highest thermal efficiency at each speed of the internal combustion engine as the economic point, and to draw an economic curve based on the economic points at all speeds. The calculation module is used to calculate the benefits of the internal combustion engine working at the operating point according to the operating point with a preset step size, and in combination with the efficiency data of the P2 motor. If the profit is greater than 0, it means that the internal combustion engine is not suitable for directly driving the vehicle at this operating point. The operating point of the internal combustion engine is changed to the economic point at the corresponding speed of this operating point, and the excess power is used to generate electricity for the P2 motor. If the profit is ≤0, it means that the overall profit of the direct-drive vehicle of the internal combustion engine is greater at this operating point. This operating point is taken as the operating point of the internal combustion engine, and all power is used for the direct-drive vehicle.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the internal combustion engine operating point calibration method according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the internal combustion engine operating point calibration method according to any one of claims 1-7.

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