A Dual-Speed Main Reducer Control Method, Terminal Device, and Storage Medium

Abstract

The present invention relates to a control method, a terminal device and a storage medium for a two-speed main reducer. The method includes: S1: obtaining the slope value of the road ahead according to the forward electronic horizon data, and entering S2 when the absolute value of the slope value is greater than the slope threshold; S2: judging whether the road ahead is an uphill section or a downhill section according to the slope value. When it is an uphill section, control the vehicle to correspond all gears of the transmission to the larger main reduction ratio in the two-speed main reducer when driving into the uphill section; when it is a downhill section, control the vehicle to correspond all gears of the transmission to the smaller main reduction ratio in the two-speed main reducer when driving into the downhill section. The present invention uses the predicted information of the road slope by the electronic horizon for the dynamic matching control of the reduction ratio of the two-speed main reducer and the transmission ratio of the transmission, and according to the terrain conditions, maximally exerts the role of the two-speed main reducer in improving the energy consumption economy of the whole vehicle.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control, and particularly to a control method for a two-speed main reducer, a terminal device, and a storage medium. Background Art

[0002] Generally, the main reducer of an automobile has a fixed transmission ratio, but for some vehicles, the transmission system is matched with a two-speed main reducer. The two-speed main reducer can reduce the size of the transmission while meeting the power performance and economy of the vehicle, facilitating layout. However, the traditional two-speed main reducer is generally statically and fixedly matched with the transmission gears. As Figure 1 shown, it is the matching relationship between a 6-speed transmission and a two-speed main reducer of a certain vehicle model. One main reduction ratio corresponds to the first four gears, and the other main reduction ratio corresponds to the last two gears. The advantage of the two-speed ratio is that in high gears, a smaller speed ratio can be used to improve the economy of the vehicle, and in low gears, a larger speed ratio can be used to ensure the power performance of the vehicle when climbing slopes or under load.

[0003] However, during the operation of the vehicle, the working conditions and terrain are constantly changing. This fixed corresponding method cannot ensure suitability for every specific operating environment of the vehicle. Summary of the Invention

[0004] To solve the above problems, the present invention proposes a control method for a two-speed main reducer, a terminal device, and a storage medium.

[0005] The specific solutions are as follows:

[0006] A control method for a two-speed main reducer includes the following steps:

[0007] S1: Obtain the slope value of the road ahead according to the forward electronic horizon data. When the absolute value of the slope value is greater than the slope threshold, enter S2;

[0008] S2: Determine whether the road ahead is an uphill section or a downhill section according to the slope value. When it is an uphill section, control the vehicle to correspond all gears of the transmission to the larger main reduction ratio in the two-speed main reducer when driving into the uphill section; when it is a downhill section, control the vehicle to correspond all gears of the transmission to the smaller main reduction ratio in the two-speed main reducer when driving into the downhill section.

[0009] Further, the slope threshold is the slope value when the gravity generated by the slope just compensates for the reduction in driving force caused by corresponding all gears of the transmission to the gears corresponding to the smaller main reduction ratio in the two-speed main reducer when it is a downhill section.

[0010] Further, the reduction in driving force caused by corresponding all gears of the transmission to the gears corresponding to the smaller main reduction ratio in the two-speed main reducer is:

[0011]

[0012] Among them, ΔF represents the reduction of the driving force, T represents the output torque of the vehicle engine, i k represents the current gear, i m1 represents the gear corresponding to the larger main reduction ratio among the two main reduction ratios, i m2 represents the gear corresponding to the smaller main reduction ratio among the two main reduction ratios, r represents the tire radius of the vehicle, and η represents the transmission efficiency of the vehicle.

[0013] Furthermore, the calculation formula for the slope threshold is:

[0014]

[0015] Among them, θ′ represents the slope threshold, m represents the mass of the vehicle, and g represents the acceleration due to gravity.

[0016] A two-speed main reducer 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, the steps of the method described above in the embodiments of the present invention are implemented.

[0017] A computer-readable storage medium stores a computer program. The computer program is characterized in that when the computer program is executed by a processor, the steps of the method described above in the embodiments of the present invention are implemented.

[0018] The present invention adopts the above technical solution, uses the predicted information of the road slope by the electronic horizon for the dynamic matching control of the speed ratio of the two-speed main reducer and the transmission speed ratio, and according to the terrain conditions, maximally exerts the role of the two-speed main reducer in improving the energy consumption economy of the whole vehicle. Description of the Drawings

[0019] Figure 1 The figure shows the matching relationship diagram of a 6-speed transmission and a two-speed main reducer.

[0020] Figure 2 The figure shows the flowchart of the embodiment of the present invention. Detailed Embodiments

[0021] To further illustrate the embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, mainly used to illustrate the embodiments, and can be combined with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention.

[0022] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0023] Embodiment 1:

[0024] The embodiment of the present invention provides a control method for a two-speed main reducer, as Figure 2 shown, the method includes the following steps:

[0025] S1: Obtain the slope value of the road ahead according to the forward electronic horizon data. When the absolute value of the slope value is greater than the slope threshold, enter S2.

[0026] S2: Judge whether the road ahead is an uphill section or a downhill section according to the slope value. When it is an uphill section, control the vehicle to correspond all gears of the transmission to the larger main reduction ratio in the two-speed main reducer when driving into the uphill section; when it is a downhill section, control the vehicle to correspond all gears of the transmission to the smaller main reduction ratio in the two-speed main reducer when driving into the downhill section.

[0027] Corresponding to the larger main reduction ratio in the uphill section, the speed ratio corresponding to the high transmission gear is increased, improving the power performance of the vehicle, preventing fuel consumption caused by gear downshift due to insufficient power, and ensuring the economy of the vehicle.

[0028] Corresponding to the smaller main reduction ratio in the downhill section can increase the economy of the vehicle. After entering the downhill section, the gravity generated by the downhill slope can compensate for the power loss caused by the small transmission ratio, so the driving performance is not affected.

[0029] When the absolute value of the slope value is less than or equal to the slope threshold, the original corresponding relationship between the transmission gear and the speed ratio in each of the two main reduction ratios is maintained, and the economy of the original vehicle's traditional parameter matching under normal working conditions is maintained.

[0030] The following introduces the calculation method of the slope threshold.

[0031] When driving at the larger main reduction ratio of the two main reduction ratios, the mechanical transmission equation of the vehicle is:

[0032]

[0033] When driving at the smaller main reduction ratio of the two main reduction ratios, the mechanical transmission equation of the vehicle is:

[0034]

[0035] Among them, F 1 、F 2 both represent the driving force of the vehicle, T represents the output torque of the vehicle engine, i k represents the current gear, i m1 represents the gear corresponding to the larger main reduction ratio of the two main reduction ratios, i m2It represents the gear corresponding to the smaller of the two main reduction ratios. r represents the tire radius of the vehicle, and η represents the transmission efficiency of the vehicle, which is generally a fixed value.

[0036] When using the gear i corresponding to the smaller of the two main reduction ratios m2 to replace the gear i corresponding to the larger of the two main reduction ratios m1 Since i m2 < i m1 , it will affect the driving force of the vehicle and cause the driving force of the vehicle to decrease:

[0037]

[0038] Among them, ΔF represents the reduction amount of the driving force.

[0039] When entering a downhill section, due to the gravitational force generated by the slope, it can make up for the reduction of the driving force caused by corresponding all gears of the transmission to the gear i corresponding to the smaller of the two-speed main reducer m2 . Assuming that the slope value is θ, when the gravitational force generated by the slope is just enough to compensate for the power reduction, the relationship is:

[0040]

[0041] Among them, ΔF represents the reduction of the driving force, m represents the mass of the vehicle, and g represents the acceleration due to gravity.

[0042] Therefore, the slope value θ′ when the gravitational force generated by the slope is just enough to compensate for the power reduction is:

[0043]

[0044] Since i m2 < i m1 , the sign of the calculated θ′ is positive. When entering an uphill section, the calculation method of the slope value when the gravitational force generated by the slope is just enough to compensate for the power reduction is the same as the above calculation method when entering a downhill section, and the result has the same absolute value as the result of the downhill section but the opposite sign. Therefore, the slope threshold is set as θ′.

[0045] According to the electronic horizon technology in Embodiment 1 of the present invention, relying on map data and satellite positioning signals, it can provide accurate information about the road ahead for the vehicle, enabling the vehicle to have the ability to predict the road conditions within a relatively long distance ahead. The predicted information of the road slope by the electronic horizon is used for the dynamic matching control of the speed ratio of the two-speed main reducer and the speed ratio of the transmission, so that the role of the two-speed main reducer in improving the energy consumption economy of the whole vehicle can be maximally exerted according to the terrain conditions.

[0046] Embodiment 2:

[0047] The present invention also provides a control terminal device for a two-speed main reducer, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above method embodiment of Embodiment 1 of the present invention are implemented.

[0048] Further, as an executable solution, the control terminal device for the two-speed main reducer may be a computing device such as an in-vehicle computer or a cloud server. The control terminal device for the two-speed main reducer may include, but is not limited to, a processor and a memory. Those skilled in the art can understand that the above-described composition structure of the control terminal device for the two-speed main reducer is only an example of the control terminal device for the two-speed main reducer, and does not constitute a limitation on the control terminal device for the two-speed main reducer. It may include more or fewer components than the above, or combine some components, or different components. For example, the control terminal device for the two-speed main reducer may further include input / output devices, network access devices, a bus, etc. The embodiments of the present invention do not make any limitations in this regard.

[0049] Further, as an executable solution, the so-called processor may be a central processing unit (CPU), or may also be 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 may be a microprocessor or the processor may also be any conventional processor, etc. The processor is the control center of the control terminal device for the two-speed main reducer, and connects various parts of the entire control terminal device for the two-speed main reducer through various interfaces and lines.

[0050] The memory can be used to store the computer programs and / or modules. By running or executing the computer programs and / or modules stored in the memory and invoking the data stored in the memory, the processor realizes various functions of the two-speed main reducer control terminal device. The memory may mainly include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to 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 a hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

[0051] The present invention also provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the method in the above embodiments of the present invention are realized.

[0052] If the modules / units integrated in the two-speed main reducer control terminal device are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above embodiments of the method of the present invention, it can also be completed by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above various method embodiments can be realized. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc.

[0053] Although the present invention is specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in form and detail without departing from the spirit and scope of the present invention defined by the appended claims, and all are within the protection scope of the present invention.

Claims

1. A control method for a two-speed main reducer, characterized in that, it includes the following steps: S1: Obtain the slope value of the road ahead according to the forward electronic horizon data. When the absolute value of the slope value is greater than the slope threshold, enter S2; the slope threshold is the slope value when the gravity generated by the slope just compensates for the reduction in driving force caused by corresponding all gears of the transmission to the gears corresponding to the smaller main reduction ratio in the two-speed main reducer when it is a downhill section. S2: Judge whether the road ahead is an uphill section or a downhill section according to the slope value. When it is an uphill section, control the vehicle to correspond all gears of the transmission to the larger main reduction ratio in the two-speed main reducer when driving into this uphill section; when it is a downhill section, control the vehicle to correspond all gears of the transmission to the smaller main reduction ratio in the two-speed main reducer when driving into this downhill section.

2. The control method for a two-speed main reducer according to claim 1, characterized in that: The reduction in driving force caused by corresponding all gears of the transmission to the gears corresponding to the smaller main reduction ratio in the two-speed main reducer is: Where, ΔF represents the reduction of the driving force, T represents the output torque of the vehicle engine, i k represents the current gear, i m1 represents the gear corresponding to the larger of the two final drive ratios, i m2 represents the gear corresponding to the smaller of the two final drive ratios, r represents the tire radius of the vehicle, and η represents the transmission efficiency of the vehicle.

3. The control method for a two-speed main reducer according to claim 2, characterized in that: The calculation formula for the slope threshold is: where, θ′ represents the slope threshold, m represents the mass of the vehicle, and g represents the acceleration due to gravity.

4. A control terminal device for a two-speed main reducer, characterized in that: it includes a processor, a memory, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of the method described in any one of claims 1 to 3.

5. A computer-readable storage medium, the computer-readable storage medium stores a computer program, characterized in that: when the computer program is executed by a processor, it implements the steps of the method described in any one of claims 1 to 3.

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