A vehicle cooling system control method, a terminal device, and a storage medium

Abstract

This invention relates to a vehicle cooling system control method, terminal equipment, and storage medium. The method includes: S1: acquiring the slope values ​​of the vehicle's current position and the position ahead, and simultaneously acquiring the current engine power value Q0, calculating the expected power change value Q1; S2: constructing a first flow conservation formula for the cooling water pump based on Q0 and Q1; S3: constructing a second flow conservation formula for the cooling water pump based on the physical characteristic curves of the power increment and flow increment of the cooling water pump; S5: calculating the time T required for the cooling water pump to increase the flow increment ΔB from the current flow B; S6: calculating the power adjustment start position of the vehicle's cooling water pump based on the vehicle's current speed v and time T, and controlling the power increase y of the cooling water pump when the vehicle reaches the power adjustment start position; S7: returning to S1 when the vehicle reaches the position ahead. This invention helps improve the stability of engine operating temperature, increases engine efficiency, and reduces fuel consumption.

Description

Technical Field

[0001] This invention relates to the field of vehicle control, and more particularly to a vehicle cooling system control method, terminal equipment, and storage medium. Background Technology

[0002] The main purpose of controlling the engine cooling system is to maintain the engine operating temperature at the optimal level, which improves combustion efficiency and saves fuel. Traditional cooling systems work by tracking the coolant temperature and adjusting the system's control parameters based on real-time temperature readings. This prevents the coolant from becoming too cold or too hot, keeping the engine at a constant temperature and improving fuel economy.

[0003] However, the circulation of coolant in the cooling system inevitably takes a certain amount of time, while engine power often changes rapidly. For example, when the terrain changes suddenly, engine power changes rapidly, and the heat generated also changes rapidly. Traditional water temperature tracking algorithms may cause the engine temperature to fluctuate because the coolant circulation takes time. Therefore, to more accurately track and control water temperature, it is necessary to be able to predict future changes in engine power. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a vehicle cooling system control method, terminal equipment, and storage medium.

[0005] The specific plan is as follows:

[0006] A method for controlling a vehicle cooling system includes the following steps:

[0007] S1: Collect the slope values ​​of the vehicle's current position and the position ahead, and simultaneously collect the power value Q0 of the vehicle's engine. Based on the slope values ​​of the vehicle's current position and the position ahead, calculate the expected change value Q1 of the vehicle's engine power at the position ahead relative to the current position.

[0008] S2: Based on the vehicle's current engine power value Q0 and the expected change in engine power value Q1 of the vehicle ahead, construct the first flow conservation formula for the coolant pump as the vehicle travels from its current position to the position ahead:

[0009]

[0010] Where y and ΔB represent the power increment and flow rate increment of the cooling water pump as it travels from the current position to the position ahead, respectively, and B represents the current flow rate of the cooling water pump.

[0011] S3: Based on the physical characteristic curves of the power increment y and flow increment ΔB of the cooling water pump, construct the second flow conservation formula for the cooling water pump:

[0012] y = g(ΔB)

[0013] Where g() represents the function corresponding to the physical characteristic curve of the power increment and flow increment of the cooling water pump;

[0014] S4: Solve for y and ΔB by combining the first and second flow conservation formulas;

[0015] S5: Based on the pipe capacity V of the vehicle engine through which the coolant flows and the coolant density ρ, calculate the time T required for the coolant pump to increase the flow rate increment ΔB from the current flow rate B:

[0016]

[0017] S6: Based on the vehicle's current speed v and time T, calculate the starting position for adjusting the power of the vehicle's coolant pump. When the vehicle reaches the starting position for adjusting the power, control the power of the coolant pump to increase by y.

[0018] S7: When the vehicle reaches the position ahead, return to S1.

[0019] Furthermore, in step S1, based on the slope values ​​of the vehicle's current position and the position ahead, the formula for calculating the expected change in engine power Q1 of the vehicle relative to the current position is as follows:

[0020]

[0021] Where n represents the current engine speed of the vehicle, r represents the wheel radius of the vehicle, m represents the total mass of the vehicle, g represents the gravitational acceleration, θ1 represents the slope value of the vehicle's current position, θ2 represents the slope value of the position in front of the vehicle, ig represents the gear ratio of the current vehicle's transmission, and ig0 represents the gear ratio of the current vehicle's final drive.

[0022] Furthermore, slope values ​​were collected using electronic horizon technology.

[0023] Furthermore, the position ahead is the closest position with a different slope value than the current position.

[0024] Furthermore, the physical characteristic curves of the power increment and flow increment of the cooling water pump are obtained from the product performance curves provided by the pump manufacturer or calibrated by the user.

[0025] Furthermore, in step S4, two curves corresponding to the first flow conservation formula and the second flow conservation formula are plotted in the same coordinate system, where the horizontal coordinate is ΔB and the vertical coordinate is y. Through the intersection point (ΔB, y) of the two curves, the flow rate increment ΔB and power increment y of the cooling water pump traveling from the current position to the next position are obtained.

[0026] A vehicle cooling system control terminal device includes a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the method described above in the embodiments of the present invention.

[0027] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method described above in the embodiments of the present invention.

[0028] The present invention adopts the above technical solution, which uses the slope value of the road in front of the vehicle to predict the change of the vehicle engine power, and then performs advance control of the cooling system, which helps to improve the stability of the engine operating temperature, improve engine efficiency and reduce fuel consumption. Attached Figure Description

[0029] Figure 1 The diagram shown is a flowchart of Embodiment 1 of the present invention.

[0030] Figure 2 The image shown is a schematic diagram of electronic horizon data in this embodiment. Detailed Implementation

[0031] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention.

[0032] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0033] Example 1:

[0034] Commercial vehicles typically carry heavy loads and operate at relatively constant speeds on non-congested roads such as highways and national roads. Therefore, road gradient has the greatest impact on engine power changes during smooth operation. Based on this, this invention provides a vehicle cooling system control method, such as... Figure 1 As shown, the method includes the following steps:

[0035] S1: Collect the slope values ​​of the vehicle's current position and the position ahead, and simultaneously collect the power value Q0 of the vehicle's engine. Based on the slope values ​​of the vehicle's current position and the position ahead, calculate the expected change in the power of the vehicle's engine at the position ahead relative to the current position, Q1.

[0036] In this embodiment, the slope value is preferably collected using electronic horizon (EBR) technology. EBR technology refers to providing vehicles with accurate information about the road ahead using map data with slope data and GPS signals, enabling the vehicle to predict road conditions. EBR technology provides predictable road information for vehicle power and other electronic controls. The forward slope value output by EBR technology is a slope point that establishes a relationship with a road offset value (the distance to be traveled relative to the road starting point, in meters). [Reference] Figure 2 , Figure 2 The text displays the offset and slope values ​​of three slope points in front of the vehicle's current position P. These three slope points are denoted as P1, P2, and P3, respectively.

[0037] Slope points P1, P2, and P3 are represented in the electronic horizon as their offset from the road's starting point and their corresponding slope value θ. The road slope ahead broadcast by the electronic horizon is a series of closely spaced, equally spaced slope points (e.g., 10-meter intervals). Therefore, based on the slope values ​​collected using electronic horizon technology, the current location and the location ahead are slope points in the electronic horizon technology; these can be adjacent or non-adjacent slope points.

[0038] Since the vehicle is at a constant speed or cruising, the difference in gradient has the greatest impact on the vehicle's engine power. Therefore, in this embodiment, the formula for calculating the expected change in vehicle engine power Q1 between the forward position and the current position is as follows:

[0039]

[0040] Where n represents the current engine speed of the vehicle, r represents the wheel radius of the vehicle, m represents the total mass of the vehicle, g represents the gravitational acceleration, θ1 represents the slope value of the vehicle's current position, θ2 represents the slope value of the position in front of the vehicle, ig represents the gear ratio of the current vehicle's transmission, and ig0 represents the gear ratio of the current vehicle's final drive.

[0041] Furthermore, since the expected power change value Q1 is not 0 only when the slope values ​​of the current position and the position ahead are different, it is preferable to set the position ahead as the position with a different slope value from the current position and the closest distance.

[0042] S2: Based on the vehicle's current engine power value Q0 and the expected change in engine power value Q1 of the vehicle ahead, construct the first flow conservation formula for the coolant pump as the vehicle travels from its current position to the position ahead:

[0043]

[0044] Where y and ΔB represent the power increment and flow rate increment of the cooling water pump as it travels from the current position to the position ahead, respectively, and B represents the current flow rate of the cooling water pump.

[0045] The principle behind constructing the first flow conservation formula is as follows:

[0046] As the engine power increases, the heat generated also increases. Therefore, to maintain a constant temperature, the coolant flow rate should also increase. Assuming the current coolant pump flow rate is B, we need to determine the increase in coolant flow rate ΔB as the vehicle travels from its current position to the next position. To increase the flow rate increment ΔB, the coolant pump power must be increased. Let's assume the increase in coolant pump power is an unknown variable y. Clearly, y is a monotonic function with ΔB as the variable, denoted as y = f(ΔB).

[0047] Since the water pump power is also provided by the vehicle engine power, assuming there is no power conversion loss, the ratio of the total power increase (Q1+y) of the vehicle engine to the original power Q0 is approximately equal to the ratio of the increase in the coolant pump flow rate ΔB to the original flow rate B, that is: The first law of conservation of flow can be obtained by rearranging the formulas:

[0048] S3: Based on the physical characteristic curves of the power increment y and flow increment ΔB of the cooling water pump, construct the second flow conservation formula for the cooling water pump:

[0049] y = g(ΔB)

[0050] Where g() represents the function corresponding to the physical characteristic curve of the power increment and flow increment of the cooling water pump;

[0051] The physical characteristic curves of power increment and flow increment of cooling water pump can be obtained from the product performance curves provided by the pump manufacturer, or can be calibrated by the user. No restrictions are imposed here.

[0052] S4: Solve the first and second flow conservation formulas simultaneously to find y and ΔB.

[0053] In this embodiment, two curves corresponding to the first flow conservation formula and the second flow conservation formula are plotted in the same coordinate system, where the horizontal coordinate is ΔB and the vertical coordinate is y. By passing through the intersection point (ΔB, y) of the two curves, the flow rate increment ΔB and power increment y of the cooling water pump traveling from the current position to the next position can be obtained.

[0054] S5: Based on the pipe capacity V of the vehicle engine through which the coolant flows and the coolant density ρ, calculate the time T required for the coolant pump to increase the flow rate increment ΔB from the current flow rate B:

[0055]

[0056] S6: Based on the vehicle's current speed v and time T, calculate the starting position for adjusting the power of the vehicle's coolant pump. When the vehicle reaches the starting position for adjusting the power, control the power of the coolant pump to increase by y.

[0057] In this embodiment, the power adjustment position is determined based on the offset value of the slope point corresponding to the current position and the position ahead in the electronic horizon technology. The offset value of the slope point P2 corresponding to the current position is set to offset2, and the offset value of the slope point corresponding to the current position of the vehicle is offset. When the vehicle travels to offset2-offset=VT, the power of the cooling water pump is increased by y based on the existing power.

[0058] S7: When the vehicle reaches the position ahead, return to S1.

[0059] In this embodiment, by predicting and judging the terrain, the cooling temperature control level is improved, the degree of conformity with future power changes is improved, the stability and accuracy of temperature control are improved, and the engine economy is improved. Through the continuous repetition of steps S1 to S7, the cooling system can be continuously predicted and controlled.

[0060] Example 2:

[0061] The present invention also provides a vehicle cooling system control terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the method embodiment described above in Embodiment 1 of the present invention.

[0062] Furthermore, as an executable solution, the vehicle cooling system control terminal device can be a computing device such as an on-board computer or a cloud server. The vehicle cooling system control terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will understand that the above-described composition of the vehicle cooling system control terminal device is merely an example and does not constitute a limitation on the vehicle cooling system control terminal device. It may include more or fewer components than described above, or combine certain components, or different components. For example, the vehicle cooling system control terminal device may also include input / output devices, network access devices, buses, etc., and this embodiment of the invention does not limit this.

[0063] Furthermore, as an executable solution, the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. This processor is the control center of the vehicle cooling system control terminal equipment, connecting various parts of the entire vehicle cooling system control terminal equipment via various interfaces and lines.

[0064] The memory can be used to store the computer programs and / or modules. The processor implements various functions of the vehicle cooling system control terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0065] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the method described in the embodiments of the present invention.

[0066] If the modules / units integrated into the vehicle cooling system control terminal equipment are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc.

[0067] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A vehicle cooling system control method, characterized in that, Includes the following steps: S1: Collect the slope values ​​of the vehicle's current position and the position ahead, and simultaneously collect the power value Q0 of the vehicle's engine. Based on the slope values ​​of the vehicle's current position and the position ahead, calculate the expected change value Q1 of the vehicle's engine power at the position ahead relative to the current position. S2: Based on the vehicle's current engine power value Q0 and the expected change in engine power value Q1 of the vehicle ahead, construct the first flow conservation formula for the coolant pump as the vehicle travels from its current position to the position ahead: Where y and ΔB represent the power increment and flow rate increment of the cooling water pump as it travels from the current position to the position ahead, respectively, and B represents the current flow rate of the cooling water pump. S3: Based on the physical characteristic curves of the power increment y and flow increment ΔB of the cooling water pump, construct the second flow conservation formula for the cooling water pump: y = g(ΔB) Where g() represents the function corresponding to the physical characteristic curve of the power increment and flow increment of the cooling water pump; S4: Solve for y and ΔB by combining the first and second flow conservation formulas; S5: Based on the pipe capacity V of the vehicle engine through which the coolant flows and the coolant density ρ, calculate the time T required for the coolant pump to increase the flow rate increment ΔB from the current flow rate B: S6: Based on the vehicle's current speed v and time T, calculate the starting position for adjusting the power of the vehicle's coolant pump. When the vehicle reaches the starting position for adjusting the power, control the power of the coolant pump to increase by y. S7: When the vehicle reaches the position ahead, return to S1.

2. The vehicle cooling system control method according to claim 1, characterized in that: In step S1, the formula for calculating the expected change in engine power Q1 between the current vehicle position and the slope value of the position ahead, based on the vehicle's current position and the slope value of the position ahead, is as follows: Where n represents the current engine speed of the vehicle, r represents the wheel radius of the vehicle, m represents the total mass of the vehicle, g represents the gravitational acceleration, θ1 represents the slope value of the vehicle's current position, θ2 represents the slope value of the position in front of the vehicle, ig represents the gear ratio of the current vehicle's transmission, and ig0 represents the gear ratio of the current vehicle's final drive.

3. The vehicle cooling system control method according to claim 1, characterized in that: Slope values ​​were collected using electronic horizon technology.

4. The vehicle cooling system control method according to claim 1, characterized in that: The location ahead has a different slope value than the current location and is the closest point.

5. The vehicle cooling system control method according to claim 1, characterized in that: The physical characteristic curves of the power increment and flow increment of the cooling water pump are obtained from the product performance curves provided by the pump manufacturer or calibrated by the user.

6. The vehicle cooling system control method according to claim 1, characterized in that: Step S4 involves plotting two curves corresponding to the first flow conservation formula and the second flow conservation formula in the same coordinate system, where the horizontal coordinate is ΔB and the vertical coordinate is y. By passing through the intersection point (ΔB, y) of the two curves, the flow rate increment ΔB and power increment y of the cooling water pump traveling from the current position to the next position are obtained.

7. A vehicle cooling system control terminal device, characterized in that: It includes a processor, a memory, and a computer program stored in the memory and running on the processor, wherein the processor executes the computer program to implement the steps of the method as described in any one of claims 1 to 6.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 6.

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