Energy accumulator pressure building method and device, storage medium and vehicle

Abstract

The invention provides an energy accumulator pressure building method and device, a storage medium and a vehicle. The method comprises the following steps: acquiring a historical driving condition in a preset distance road section in front of a vehicle; the gear shifting frequency of the vehicle is predicted according to the historical driving working conditions in the preset distance road section; according to the gear shifting frequency, the oil charging pressure upper limit value of an energy accumulator of the vehicle is calculated; and performing pressure build-up limitation on the energy accumulator based on the pressure upper limit value. The contradictory problem that consumed oil pump energy is too large and the oil amount is insufficient during gear shifting can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to a method and device for building pressure of an accumulator, a storage medium, and a vehicle. Background Art

[0002] The vehicle speed change will adjust the transmission gear, and hydraulic oil in the accumulator needs to be consumed during gear shifting. The hydraulic oil in the accumulator needs to be filled when the accumulator pressure is lower than the predetermined pressure lower limit value P min and stop filling when the pressure is higher than the predetermined pressure upper limit value P max . The higher the predetermined pressure upper limit value P max , the more oil in the accumulator and the more gear shifting times it can support. When the vehicle is driving on an urban road, if the speed is fast and slow, it will cause an increase in the hydraulic oil consumed in the accumulator. However, if the oil is filled each time according to the high predetermined pressure upper limit value P max , the load of the oil pump will increase at this time, and the energy consumed by the oil pump will be too large; if the oil is filled each time according to the low predetermined pressure upper limit value P max , it will cause insufficient oil volume during gear shifting and reduce the drivability of the vehicle. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a method and device for building pressure of an accumulator, a storage medium, and a vehicle, which can solve the contradictory problems of excessive energy consumption of the oil pump and insufficient oil volume during gear shifting.

[0004] One aspect of the embodiments of the present application provides a method for building pressure of an accumulator. The method includes: obtaining the historical driving conditions within a predetermined distance section in front of the vehicle; predicting the gear shifting frequency of the vehicle according to the historical driving conditions within the predetermined distance section; calculating the pressure upper limit value for filling the accumulator of the vehicle according to the gear shifting frequency; and performing pressure building limitation on the accumulator based on the pressure upper limit value.

[0005] Further, the obtaining the historical driving conditions within a predetermined distance section in front of the vehicle includes: obtaining the average speed of all vehicles that have driven past within the predetermined distance section through big data information, and the predicting the gear shifting frequency of the vehicle according to the historical driving conditions within the predetermined distance section includes: predicting the gear shifting frequency of the vehicle according to the average speed of all vehicles that have driven past within the predetermined distance section.

[0006] Further, predicting the shifting frequency of the vehicle according to the average speed of all the vehicles that have traveled in the predetermined distance section includes: obtaining the average speed change range of all the vehicles that have traveled in the predetermined distance section according to the average speed of all the vehicles that have traveled in the predetermined distance section; predicting the average total number of shifts of the vehicle in the predetermined distance section according to the average speed change range of all the vehicles that have traveled in the predetermined distance section; and obtaining the shifting frequency of the vehicle according to the average total number of shifts of the vehicle in the predetermined distance section.

[0007] Further, predicting the average total number of shifts of the vehicle in the predetermined distance section according to the average speed change range of all the vehicles that have traveled in the predetermined distance section includes: defining shift categories according to the number of consecutive shift gears, where different shift categories correspond to different numbers of consecutive shift gears; counting the number of shifts of the vehicle in each shift category according to the average speed change range of all the vehicles that have traveled in the predetermined distance section; and obtaining the average total number of shifts of the vehicle in the predetermined distance section according to the number of shifts in each shift category.

[0008] Further, the average total number of shifts of the vehicle in the predetermined distance section is obtained through the following formula according to the number of shifts in each shift category:

[0009]

[0010] where N r is the average total number of shifts of the vehicle in the predetermined distance section; n is the total number of gears of the vehicle; N r2 (i) is the number of shifts of the vehicle in the i-th shift category; N r1 (i) is the number of shift gears corresponding to the i-th shift category.

[0011] Further, obtaining the shifting frequency of the vehicle according to the average total number of shifts of the vehicle in the predetermined distance section includes: obtaining the average elapsed time of all the vehicles that have traveled in the predetermined distance section according to the average speed of all the vehicles that have traveled in the predetermined distance section and the length of the predetermined distance section; obtaining the average shift time interval of the vehicle according to the average elapsed time and the average total number of shifts of the vehicle; and obtaining the shifting frequency of the vehicle according to the average shift time interval of the vehicle.

[0012] Further, calculating the upper limit value of the pressure for charging the accumulator of the vehicle according to the shifting frequency includes: calculating the upper limit value of the pressure for charging the accumulator of the vehicle according to the shifting frequency and the pressure consumed for one shift.

[0013] Another aspect of the embodiments of the present application provides a computer-readable storage medium, on which computer programs / instructions are stored. When the computer programs / instructions are executed by a processor, the steps of the accumulator pressure building method described above are implemented.

[0014] Another aspect of the embodiments of the present application provides an accumulator pressure building device, including a memory, a processor, and a computer program stored on the memory. The processor executes the computer program to implement the steps of the accumulator pressure building method as described above.

[0015] Another aspect of the embodiments of the present application provides a vehicle. The vehicle includes the accumulator pressure building device as described above.

[0016] The accumulator pressure building method, device, storage medium, and vehicle according to one or more embodiments of the present application can adjust the upper limit value of the accumulator oil filling pressure of the vehicle according to the predicted shift frequency of the vehicle, ensuring that the upper limit value of the accumulator oil filling pressure is minimized to the greatest extent while meeting the shift requirements, reducing the energy consumption caused by oil filling, and solving the contradictory problems of excessive energy consumption of the oil pump and insufficient oil volume during shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flowchart of the accumulator pressure building method according to an embodiment of the present application.

[0018] Figure 2 It is a schematic diagram of the influence of the average speed of all past vehicles on the shift times of the vehicle according to an embodiment of the present application.

[0019] Figure 3 It is a flowchart of predicting the shift frequency of the vehicle according to the average speed of all past vehicles according to an embodiment of the present application.

[0020] Figure 4 It is a schematic block diagram of the accumulator pressure building device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0022] Next, with reference to the drawings, the accumulator pressure building method, device, storage medium, and vehicle of each embodiment of the present application will be described in detail. Without conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0023] The present application provides a method for building pressure in an accumulator. Figure 1 Disclosed is a flowchart of a method for building pressure in an accumulator according to an embodiment of the present application. As Figure 1 shown, the method for building pressure in an accumulator according to an embodiment of the present application may include steps S1 to S4.

[0024] In step S1, obtain the historical driving conditions within a predetermined distance section in front of the vehicle.

[0025] The navigation system of the vehicle can be connected to the big data system. Therefore, in some embodiments, obtaining the historical driving conditions within a predetermined distance section in front of the vehicle may include: obtaining the average speed of all vehicles that have driven past within the predetermined distance section through big data information. Thus, a curve of the average speed of all vehicles that have driven past within the predetermined distance section changing with the driving distance can be obtained, as Figure 2 shown.

[0026] In step S2, predict the shifting frequency of the vehicle according to the historical driving conditions within the predetermined distance section.

[0027] In the case where the average speed of all vehicles that have driven past within the predetermined distance section is obtained through big data information, the shifting frequency of the vehicle can be predicted according to the average speed of all vehicles that have driven past within the predetermined distance section.

[0028] Figure 2 Disclosed is a schematic diagram of the influence of the average speed of all vehicles that have driven past on the shifting times of the vehicle according to an embodiment of the present application. As Figure 2 shown, after obtaining the curve of the average speed of all vehicles that have driven past within the predetermined distance section changing with the driving distance through big data information, the shifting situation of the vehicle can be obtained by combining the upshift point and downshift point of the vehicle. Generally, the transmission gear shifts up when the vehicle speed increases to a certain value (i.e., reaches a certain upshift point), and shifts down when the vehicle speed is lower than a certain value (i.e., reaches a certain downshift point). On the Figure 2 average speed curve, during the process where the average speed continuously increases with the driving distance, the number of consecutive upshifts can be obtained according to the number of upshift points passed by the continuously rising average speed. For example, during the Figure 2 process where the average speed continuously rises, it passes through upshift point 1 and upshift point 2 successively. Therefore, it can be obtained that there are two upshifts during this process. Similarly, during the process where the average speed continuously decreases with the driving distance, the number of consecutive downshifts can be obtained according to the number of downshift points passed by the continuously decreasing average speed. For example, during the Figure 2 process where the average speed continuously decreases, it passes through downshift point 2 and downshift point 1 successively. Therefore, it can be obtained that there are two downshifts during this process.

[0029] It is understandable that Figure 2 the curve showing the average speed of all the vehicles that have passed by varying with the driving distance, as well as the number of upshift points and downshift points of the vehicle itself, are only a schematic example of this application. However, this application is not limited thereto. In fact, the curve showing the average speed of all the vehicles that have passed by varying with the driving distance may be more complex than Figure 2 that shown, and the number of upshift points and downshift points of the vehicle itself may also be more.

[0030] Figure 3 The flowchart for predicting the shifting frequency of the vehicle itself based on the average speed of all the vehicles that have passed by discloses an embodiment of this application. The following will be combined with Figure 2 and Figure 3 to introduce in detail how to predict the shifting frequency of the vehicle itself according to the average speed of all the vehicles that have passed by within a predetermined distance section.

[0031] As Figure 3 shown, in some embodiments, predicting the shifting frequency of the vehicle itself according to the average speed of all the vehicles that have passed by within a predetermined distance section may include steps S21 to S23.

[0032] In step S21, the average speed change amplitude of all the vehicles that have passed by within the predetermined distance section can be obtained according to the average speed of all the vehicles that have passed by within the predetermined distance section.

[0033] In step S22, the average total number of shifts of the vehicle itself within the predetermined distance section can be estimated according to the average speed change amplitude of all the vehicles that have passed by within the predetermined distance section obtained in step S21.

[0034] The shifting categories can be defined according to the number of gears for continuous shifting, where different shifting categories correspond to different numbers of gears for continuous shifting. For example, continuously shifting up only one gear or continuously shifting down only one gear can be defined as the first shifting category; continuously shifting up two gears or continuously shifting down two gears can be defined as the second shifting category; continuously shifting up three gears or continuously shifting down three gears can be defined as the third shifting category; and so on. Continuously shifting up K gears or continuously shifting down K gears can be defined as the Kth shifting category. Assuming that the total number of gears of the vehicle itself is n gears, then K = n - 1.

[0035] Then, the number of shifts of the vehicle itself in each shifting category can be counted according to the average speed change amplitude of all the vehicles that have passed by within the predetermined distance section. For example, count the number of shifts in the first shifting category, the number of shifts in the second shifting category,..., the number of shifts in the Kth shifting category within the predetermined distance section.

[0036] Next, the average total number of gear shifts of the vehicle within a predetermined distance section can be obtained based on the number of gear shifts in each gear shift category.

[0037] In some embodiments, the average total number of gear shifts of the vehicle within a predetermined distance section can be obtained according to the number of gear shifts in each gear shift category through the following formula:

[0038]

[0039] Where N r is the average total number of gear shifts of the vehicle within a predetermined distance section; n is the total number of gears of the vehicle; N r2 (i) is the number of gear shifts of the vehicle in the i-th gear shift category; N r1 (i) is the number of gears corresponding to the gear shifts in the i-th gear shift category.

[0040] In step S23, the gear shift frequency of the vehicle is obtained based on the average total number of gear shifts of the vehicle within a predetermined distance section.

[0041] In some embodiments, obtaining the gear shift frequency of the vehicle based on the average total number of gear shifts of the vehicle within a predetermined distance section in step S23 may further include steps S231 to S233.

[0042] In step S231, the average elapsed time of all vehicles that have traveled within a predetermined distance section can be obtained based on the average speed of all vehicles that have traveled within a predetermined distance section and the length of the predetermined distance section.

[0043] In step S232, the average gear shift time interval of the vehicle can be obtained based on the average elapsed time of all vehicles that have traveled obtained in step S231 and the average total number of gear shifts of the vehicle.

[0044] The average gear shift time interval of the vehicle can be expressed as follows:

[0045] T i = L / (V × N r )

[0046] Where T i is the average gear shift time interval of the vehicle, L is the length of the predetermined distance section, and V is the average speed of all vehicles that have traveled within a predetermined distance section.

[0047] In step S233, the gear shift frequency H i of the vehicle is obtained based on the average gear shift time interval T z_Shift .

[0048] Return to reference Figure 1, in step S3, the upper limit value of the pressure for charging the accumulator of the vehicle can be calculated based on the shifting frequency obtained in step S2.

[0049] In some embodiments, the upper limit value of the pressure for charging the accumulator of the vehicle can be calculated based on the shifting frequency and the pressure consumed for one shift.

[0050] The upper limit value of the pressure for charging the accumulator of the vehicle can be expressed as follows:

[0051] P max = a × H z_shift

[0052] where P max is the upper limit value of the pressure for charging the accumulator; a is a coefficient with the unit of bar, which is related to the pressure consumed for one shift. For example, when the accumulator is charged with a pressure of 60 bar, it can support 6 shifts; in the example where the accumulator is charged with a pressure of 50 bar and can support 5 shifts, the coefficient a can be defined as 10 bar.

[0053] In step S4, the pressure build-up of the accumulator is restricted based on the upper limit value of the pressure for charging the accumulator obtained in step S3.

[0054] After the accumulator is full of oil, it can support several consecutive shifts. For example, a pressure of 60 bar can support 6 shifts, and a pressure of 50 bar can support 5 shifts. When the pressure is insufficient, it needs to be pressurized in time. However, a high pressure during pressurization will cause excessive energy consumption during pressurization because the greater the pressure, the more difficult it is to pressurize, and since the pressure of the high-pressure system will gradually decrease over time, the pressure charged without shifting will also be slowly released.

[0055] The accumulator pressure build-up method of the present application can adjust the upper limit value of the pressure for charging the accumulator of the vehicle according to the predicted shifting frequency of the vehicle, and the upper limit value of the pressure for charging the accumulator P max is determined according to the number of shifts of the vehicle in the short term. For example, if the calculated shifting frequency is very small, it indicates that the number of shifts required is small. At this time, the upper limit value of the pressure for charging the accumulator P max can be made smaller; if frequent shifting is required, the upper limit value of the pressure for charging the accumulator P max needs to be made larger, thereby achieving both meeting the shifting requirements and not having to charge the upper limit value of the pressure for charging the accumulator P max very high throughout the process.

[0056] Therefore, the accumulator pressure build-up method of the present application ensures that the upper limit value of the pressure for charging the accumulator P max is minimized while meeting the shifting requirements, reducing the energy consumption caused by oil charging, and solving the contradiction between excessive energy consumption of the oil pump and insufficient oil volume during shifting.

[0057] The present application also provides a computer-readable storage medium, on which a computer program / instructions are stored. When the computer program / instructions are executed by a processor, the steps of the accumulator pressurization method described above are implemented.

[0058] The present application also provides an accumulator pressurization device. Figure 4 A schematic block diagram of an accumulator pressurization device 100 according to an embodiment of the present application is disclosed. As Figure 4 shown, an accumulator pressurization device 100 according to an embodiment of the present application includes a processor 101, an internal bus 102, a network interface 103, a memory 104, and a non-volatile memory 105. Of course, other hardware required for other services may also be included. The processor 101 can read the corresponding computer program from the non-volatile memory 105 into the memory 104 and then run it to implement the steps of the accumulator pressurization method described above. Of course, in addition to the software implementation, the present application does not exclude other implementation manners, such as logical devices or a combination of software and hardware, etc. That is to say, the execution subject of the following processing flow is not limited to each logical unit, and may also be hardware or a logical component.

[0059] The accumulator pressurization device 100 of the present application may have beneficial technical effects similar to those of the accumulator pressurization method described above. Therefore, it will not be elaborated here.

[0060] The present application also provides a vehicle. The vehicle may include the accumulator pressurization device described above.

[0061] The accumulator pressurization method, device, storage medium, and vehicle provided by the embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the accumulator pressurization method, device, storage medium, and vehicle of the embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of the present application and is not intended to limit the present application. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the spirit and principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the protection scope of the appended claims of the present application.

Claims

1. A method for building pressure of an accumulator, characterized in that: Including: Obtain the historical driving conditions within a predetermined distance section in front of the vehicle; Predict the shifting frequency of the vehicle according to the historical driving conditions within the predetermined distance section; Calculate the upper limit value of the pressure for charging the accumulator of the vehicle according to the shifting frequency; Perform pressure building limit on the accumulator based on the upper limit value of the pressure.

2. The method according to claim 1, characterized in that: The obtaining of the historical driving conditions within a predetermined distance section in front of the vehicle includes: Obtain the average speed of all vehicles that have traveled in the predetermined distance section through big data information, The predicting of the shifting frequency of the vehicle according to the historical driving conditions within the predetermined distance section includes: Predict the shifting frequency of the vehicle according to the average speed of all vehicles that have traveled in the predetermined distance section.

3. The method according to claim 2, wherein: The predicting of the shifting frequency of the vehicle according to the average speed of all vehicles that have traveled in the predetermined distance section includes: Obtain the average amplitude of speed change of all vehicles that have traveled in the predetermined distance section according to the average speed of all vehicles that have traveled in the predetermined distance section; Estimate the average total number of gear shifts of the vehicle in the predetermined distance section according to the average amplitude of speed change of all vehicles that have traveled in the predetermined distance section; Obtain the shifting frequency of the vehicle according to the average total number of gear shifts of the vehicle in the predetermined distance section.

4. The method according to claim 3, characterized in that: The estimating of the average total number of gear shifts of the vehicle in the predetermined distance section according to the average amplitude of speed change of all vehicles that have traveled in the predetermined distance section includes: Define shift categories according to the number of consecutive shifting gears, where different shift categories correspond to different numbers of consecutive shifting gears; Count the number of gear shifts of the vehicle in each shift category according to the average amplitude of speed change of all vehicles that have traveled in the predetermined distance section; Obtain the average total number of gear shifts of the vehicle in the predetermined distance section according to the number of gear shifts in each shift category.

5. The method according to claim 4, characterized in that: Obtain the average total number of gear shifts of the vehicle in the predetermined distance section through the following formula according to the number of gear shifts in each shift category: Where N r is the average total number of gear shifts of the vehicle within the predetermined distance section; n is the total number of gears of the vehicle; N r2 (i) is the number of gear shifts of the vehicle in the i-th gear shift category; N r1 (i) is the number of gears corresponding to the gear shift in the i-th gear shift category.

6. The method according to claim 3, characterized in that: The obtaining of the shifting frequency of the vehicle according to the average total number of gear shifts of the vehicle in the predetermined distance section includes: Obtain the average duration passed by all vehicles that have traveled in the predetermined distance section according to the average speed of all vehicles that have traveled in the predetermined distance section and the length of the predetermined distance section; Obtain the average shift time interval of the vehicle according to the average duration and the average total number of gear shifts of the vehicle; Obtain the shifting frequency of the vehicle according to the average shift time interval of the vehicle.

7. The method according to any one of claims 1 to 6, characterized in that: The calculating of the upper limit value of the pressure for charging the accumulator of the vehicle according to the shifting frequency includes: Calculate the upper limit value of the pressure for charging the accumulator of the vehicle according to the shifting frequency and the pressure consumed for one gear shift.

8. A computer-readable storage medium having computer programs / instructions stored thereon, characterized in that, When the computer program / instructions are executed by a processor, the steps of the accumulator pressure building method described in any one of claims 1 to 7 are implemented.

9. An accumulator pressure building device, characterized in that: Including a memory, a processor, and a computer program stored on the memory, characterized in that the processor executes the computer program to implement the steps of the accumulator pressure building method described in any one of claims 1 to 7.

10. A vehicle, characterized in that: Comprising an accumulator pressure building device as described in claim 9.

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