Method and system for obtaining current-oil pressure characteristics of transmission solenoid valve

Abstract

The present invention discloses a method and system for acquiring the current-oil pressure characteristics of a transmission solenoid valve. The method for acquiring the current-oil pressure characteristics of a transmission solenoid valve is to acquire the current value of the transmission solenoid valve of a vehicle and determine whether the current value has reached a target current. When it is determined that the current value has reached the target current, the oil pressure value of the transmission hydraulic system is acquired in real time. After a certain waiting time, it is determined whether the oil pressure value meets the oil pressure fluctuation verification condition. When it is determined that the oil pressure value meets the oil pressure fluctuation verification condition, it is determined whether the oil pressure value meets the oil pressure fluctuation confirmation condition. When it is determined that the oil pressure value meets the oil pressure fluctuation confirmation condition, the sampling phase is entered, and the average value of multiple oil pressure values within the sampling time range is calculated. This method for acquiring the current-oil pressure characteristics of a transmission solenoid valve can not only acquire a more accurate transmission hydraulic system oil pressure value corresponding to the target current, but also shorten the oil pressure value acquisition time, thereby improving work efficiency.

Description

Technical Field

[0001] The present invention relates to the field of automobile transmissions, and in particular to a method and system for acquiring current-oil pressure characteristics of a transmission solenoid valve. Background Art

[0002] The transmission transmits power by means of a transmission belt and a driving pulley and a driven pulley with variable working diameters to achieve continuous changes in the transmission ratio. The continuous change in the transmission ratio can achieve a dynamic optimal match between the vehicle's driving resistance and the engine load, allowing the engine to always operate in the high-efficiency zone, thereby enabling the engine to perform at its best according to the driver's operating intentions.

[0003] The transmission solenoid valve current-oil pressure characteristic is one of the basic characteristics of the transmission hydraulic system pressure control. This characteristic must be obtained and verified in the transmission manufacturing and after-sales replacement. Figure 1 As shown, the current current-oil pressure characteristic adopts the method of waiting for a fixed time at a certain stable current point to calibrate and obtain the characteristic value. This method consumes a long cumulative time.

[0004] Therefore, the transmission solenoid valve current-oil pressure characteristic method in the prior art has the problem of being time-consuming. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the current-oil pressure characteristic method of a transmission solenoid valve in the prior art consumes a long time.

[0006] To solve the above problem, an embodiment of the present invention provides a method for obtaining the current-oil pressure characteristics of a transmission solenoid valve. The method specifically includes the following steps:

[0007] S1: Obtain the current value of the vehicle's transmission solenoid valve and determine whether the current value reaches the target current;

[0008] If yes, proceed to step S2;

[0009] If not, continue to step S1;

[0010] S2: Obtain the oil pressure value of the transmission hydraulic system in real time, and after a certain waiting time, determine whether the oil pressure value meets the oil pressure fluctuation verification condition;

[0011] If satisfied, proceed to step S3;

[0012] If not, re-judge whether the oil pressure value obtained in real time meets the oil pressure fluctuation verification condition;

[0013] S3: Determine whether the oil pressure value meets the oil pressure fluctuation confirmation condition;

[0014] If satisfied, proceed to step S4;

[0015] If not, re-judge whether the oil pressure value obtained in real time meets the oil pressure fluctuation confirmation condition;

[0016] S4: Enter the sampling phase and calculate the average value of multiple oil pressure values within the sampling time range.

[0017] Using the above technical solution, the acquisition method can obtain the oil pressure value of the transmission hydraulic system in real time, enabling real-time monitoring of the transmission hydraulic system's oil pressure fluctuations. This acquisition method only enters the sampling phase after the transmission hydraulic system's oil pressure value satisfies both the oil pressure fluctuation verification and oil pressure fluctuation confirmation conditions, resulting in a more accurate transmission current-oil pressure characteristic. Furthermore, this acquisition method can shorten the time required to acquire the transmission current-oil pressure characteristic, thereby improving work efficiency. Therefore, this method for acquiring the current-oil pressure characteristic of the transmission solenoid valve can not only obtain a more accurate transmission hydraulic system oil pressure value corresponding to the target current, but also shorten the time required to acquire the oil pressure value, thereby improving work efficiency.

[0018] Another embodiment of the present invention provides a method for obtaining the current-oil pressure characteristics of a transmission solenoid valve. In step S2, determining whether the oil pressure value meets the oil pressure fluctuation verification condition specifically includes the following steps:

[0019] S21: After the waiting time is over, the oil pressure value of at least two cycles is obtained in real time, and the current oil pressure peak value P is obtained. n and oil pressure trough value T n ;

[0020] S22: Calculate the current oil pressure peak value P n and oil pressure trough value T n The absolute value of the difference is the current oil pressure fluctuation value Fluc i ;

[0021] S23: Calculate the current oil pressure fluctuation value Fluc i Compared with the previous oil pressure fluctuation value Flux i-1 The difference is the oil pressure fluctuation attenuation value ΔFluc, and the oil pressure fluctuation identification stage ends;

[0022] S24: Determine the oil pressure fluctuation attenuation value ΔFluc and the previous oil pressure fluctuation value Fluc i-1 Is the ratio r greater than 2 / 3?

[0023] If yes, it is determined to be the current oil pressure fluctuation value Fluc i Unreliable, still using the oil pressure fluctuation value Fluc i-1 As the actual oil pressure fluctuation value Fluc n Execute step S25;

[0024] If not, it is determined to be the current oil pressure fluctuation value Fluc i Reliable, based on the current oil pressure fluctuation value Fluc i As the actual oil pressure fluctuation value Fluc n Execute step S25;

[0025] S25: Determine the actual oil pressure fluctuation value Fluc n Is it less than the fluctuation threshold Fluc? thrsh ;

[0026] If yes, it is determined that the oil pressure value meets the oil pressure fluctuation verification condition, and the oil pressure fluctuation verification phase ends;

[0027] If not, then after re-acquiring the oil pressure values of at least two cycles in real time, step S24 is re-executed according to the oil pressure values.

[0028] By adopting the above technical solution, the setting of the oil pressure fluctuation verification condition ensures the accuracy of the oil pressure value obtained for the transmission hydraulic system.

[0029] Another embodiment of the present invention provides a method for obtaining the current-oil pressure characteristics of a transmission solenoid valve. In step S3, determining whether the oil pressure value meets the oil pressure fluctuation confirmation condition specifically includes:

[0030] Get the actual oil pressure fluctuation value Fluc in real time n , real-time judgment of the actual oil pressure fluctuation value Fluc within the oil pressure fluctuation confirmation time range n Whether Fluc is always satisfied n <Fluc thrsh ;

[0031] If so, it is determined that the oil pressure value meets the oil pressure fluctuation confirmation condition;

[0032] If not, step S3 is executed again.

[0033] By adopting the above technical solution, the setting of the oil pressure fluctuation confirmation condition further ensures the accuracy of the oil pressure value of the transmission hydraulic system obtained, and the oil pressure value of the transmission hydraulic system can enter the sampling time after meeting the oil pressure fluctuation verification condition and the oil pressure fluctuation confirmation condition, without reserving too long waiting time, thereby shortening the oil pressure value acquisition time.

[0034] Another embodiment of the present invention provides a method for obtaining the current-oil pressure characteristics of a transmission solenoid valve. In step S21, the oil pressure values of four cycles are obtained in real time, and the maximum value of the oil pressure values in the four cycles is determined to be the current oil pressure peak value P. n The minimum value of the oil pressure is the current oil pressure trough value T n .

[0035] By adopting the above technical solution, the oil pressure peak value P is obtained in four cycles compared with two cycles and three cycles. n and oil pressure trough value T n More accurate, because if the oil pressure values in two of the cycles are equal, the oil pressure peak value P determined in the three cycles is n and oil pressure trough value T n Not accurate enough. The oil pressure peak value P is determined in five or six cycles. n and oil pressure trough value T n This will waste computing resources and increase the time required to identify and verify oil pressure fluctuations, thereby increasing the time required to obtain the oil pressure value.

[0036] Another embodiment of the present invention provides a method for obtaining the current-oil pressure characteristics of a transmission solenoid valve. In step S3, the average value of multiple oil pressure values is calculated according to the following formula:

[0037]

[0038] Among them, P avg is the average value, P i is the oil pressure value, t collect is the sampling time, and ST is the duration of the cycle.

[0039] Another embodiment of the present invention provides a method for obtaining the current-oil pressure characteristics of a transmission solenoid valve, the method further comprising the following steps:

[0040] S5: Within the sampling time range, the current oil pressure peak value P is continuously calculated based on the real-time oil pressure value obtained. n and oil pressure trough value T n , and determine the current maximum oil pressure value P in real time max and minimum oil pressure value T min ;

[0041] S6: Calculate the current maximum oil pressure value P max and minimum oil pressure value T min The difference P max -T min ;

[0042] S7: Determine the difference P max -T min Is it less than the fluctuation threshold Fluc? thrsh ;

[0043] If so, the mean value is the target value;

[0044] If not, step S5 is executed again according to the oil pressure value obtained in real time.

[0045] By adopting the above technical solution, the oil pressure value of the transmission hydraulic system obtained is verified in real time during the sampling process, thereby further improving the accuracy of the oil pressure value of the transmission hydraulic system obtained.

[0046] One embodiment of the present invention also provides a system for acquiring the current-oil pressure characteristics of a transmission solenoid valve, and the acquisition system executes the above-mentioned method for acquiring the current-oil pressure characteristics of the transmission solenoid valve. The acquisition system includes a current acquisition module, an oil pressure acquisition module, and an information processing module. The signal input end of the information processing module is communicatively connected to the signal output end of the current acquisition module and the signal output end of the oil pressure acquisition module, respectively. Among them, the current acquisition module is used to acquire the current value of the transmission solenoid valve, and transmit the information of the current value to the information processing module. The oil pressure acquisition module is used to acquire the oil pressure value of the transmission hydraulic system, and transmit the information of the oil pressure value to the information processing module. The information processing module processes the information of the current value and the information of the oil pressure value, and generates processing information.

[0047] Using the above technical solution, after the information processing module determines that the current value obtained by the current acquisition module reaches the target current, the oil pressure acquisition module starts to obtain the oil pressure value of the transmission hydraulic system, and transmits the oil pressure value information to the information processing module for processing, and finally obtains the accurate oil pressure value of the transmission hydraulic system corresponding to the target current value.

[0048] Another embodiment of the present invention provides a system for acquiring the current-oil pressure characteristics of a transmission solenoid valve, wherein the information processing module includes a calculation module, a first judgment module, a second judgment module, and a third judgment module. The current acquisition module transmits the acquired current value information to the first judgment module. The first judgment module judges the current value information, generates first processing information, and transmits the first processing information to the second judgment module. The oil pressure acquisition module transmits the acquired oil pressure value information to the second judgment module. The second judgment module receives the first processing information and the oil pressure value information, judges the oil pressure value information based on the first processing information, generates second processing information, and transmits the second processing information to the calculation module. The calculation module receives the second processing information, performs calculations based on the second processing information, generates calculation information, and transmits the calculation information to the third judgment module. The third judgment module judges the calculation information and generates third processing information.

[0049] Using the above technical solution, the first judgment module is used to determine whether the current value of the transmission solenoid valve reaches the target current. The second judgment module is used to determine whether the oil pressure value of the transmission hydraulic system meets the oil pressure fluctuation verification condition and the oil pressure fluctuation confirmation condition. The calculation module is used to calculate the average value of the oil pressure value within the sampling time. The third judgment module is used to determine whether the average value of the oil pressure value within the sampling time reaches the target value.

[0050] Another embodiment of the present invention provides a system for acquiring the current-oil pressure characteristics of a transmission solenoid valve, wherein the first processing information is to determine whether the current value reaches the target current; the second processing information is to determine whether the oil pressure value meets the oil pressure fluctuation verification condition and the oil pressure fluctuation confirmation condition; the calculation information is the average value of multiple oil pressure values within the sampling time range; and the third processing information is to determine whether the average value is the target value.

[0051] Another embodiment of the present invention provides a system for acquiring the current-oil pressure characteristics of a transmission solenoid valve, wherein the current acquisition module is configured as a current sensor; and the oil pressure acquisition module is configured as a pressure sensor.

[0052] The beneficial effects of the present invention are:

[0053] The present invention provides a method for acquiring the current-oil pressure characteristics of a transmission solenoid valve. The method obtains the current value of a vehicle's transmission solenoid valve and determines whether the current value has reached a target current. When the current value is determined to have reached the target current, the oil pressure value of the transmission hydraulic system is acquired in real time. After a certain waiting period, the method determines whether the oil pressure value meets an oil pressure fluctuation verification condition. When the oil pressure value is determined to meet the oil pressure fluctuation verification condition, the method determines whether the oil pressure value meets an oil pressure fluctuation confirmation condition. When the oil pressure value is determined to meet the oil pressure fluctuation confirmation condition, the method enters a sampling phase and calculates the average of multiple oil pressure values within the sampling time range. This acquisition method can acquire the oil pressure value of the transmission hydraulic system in real time, enabling real-time monitoring of oil pressure fluctuations in the transmission hydraulic system. This acquisition method only enters the sampling phase when the oil pressure value of the transmission hydraulic system meets both the oil pressure fluctuation verification condition and the oil pressure fluctuation confirmation condition, resulting in a more accurate transmission current-oil pressure characteristic. Furthermore, this acquisition method can shorten the time required to acquire the transmission current-oil pressure characteristics, improving work efficiency. Therefore, the method for obtaining the current-oil pressure characteristics of the transmission solenoid valve can not only obtain a more accurate oil pressure value of the transmission hydraulic system corresponding to the target current, but also shorten the oil pressure value acquisition time, thereby improving work efficiency.

[0054] Other features and corresponding beneficial effects of the present invention are described in the latter part of the specification, and it should be understood that at least some of the beneficial effects become obvious from the description in the specification of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 Obtaining a timing diagram for current-oil pressure characteristics in the prior art;

[0056] Figure 2 A flow chart of a method for obtaining the current-oil pressure characteristics of a transmission solenoid valve provided in Example 1 of the present invention;

[0057] Figure 3A timing diagram for obtaining the current-oil pressure characteristics of a transmission solenoid valve provided in Example 1 of the present invention;

[0058] Figure 4 This is a flow chart of step S2 of the method for obtaining the current-oil pressure characteristics of a transmission solenoid valve provided in embodiment 1 of the present invention;

[0059] Figure 5 Schematic diagram of oil pressure fluctuation identification and verification of the current-oil pressure characteristics of the transmission solenoid valve provided in Example 1 of the present invention;

[0060] Figure 6 A schematic diagram of peak recognition of the current-oil pressure characteristic of a transmission solenoid valve provided in Example 1 of the present invention;

[0061] Figure 7 Schematic diagram of trough identification of the current-oil pressure characteristics of the transmission solenoid valve provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0062] The following is an explanation of the embodiments of the present invention by specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0063] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0064] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0065] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0066] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on the specific circumstances.

[0067] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0068] Example 1

[0069] This embodiment provides a method for obtaining the current-oil pressure characteristics of a transmission solenoid valve. Figure 2 As shown, the acquisition method specifically includes the following steps:

[0070] S1: Obtain the current value of the vehicle's transmission solenoid valve and determine whether the current value reaches the target current;

[0071] If yes, proceed to step S2;

[0072] If not, continue to step S1;

[0073] S2: Get the oil pressure value of the transmission hydraulic system in real time, such as Figure 3 As shown, after a certain waiting time t wait Finally, determine whether the oil pressure value meets the oil pressure fluctuation verification conditions;

[0074] If satisfied, proceed to step S3;

[0075] If not, re-judge whether the oil pressure value obtained in real time meets the oil pressure fluctuation verification condition;

[0076] S3: Determine whether the oil pressure value meets the oil pressure fluctuation confirmation condition;

[0077] If satisfied, proceed to step S4;

[0078] If not, re-judge whether the oil pressure value obtained in real time meets the oil pressure fluctuation confirmation condition;

[0079] S4: Enter the sampling phase, such as Figure 3 As shown, and calculate the sampling time t collect The average value of multiple oil pressure values within a range.

[0080] Specifically, the target current can be set to 400 mA, 450 mA, 500 mA, etc., which can be determined according to actual conditions and is not specifically limited in this embodiment.

[0081] More specifically, the waiting time t wait It can be set to 600ms, 620ms, 650ms, etc., which can be specifically determined according to the transmission hydraulic system, and this embodiment does not make any specific limitation on this.

[0082] More specifically, the sampling time t collect It can be set to 500ms, 520ms, 550ms, etc., which can be determined according to actual requirements and is not specifically limited in this embodiment.

[0083] It should be noted that this acquisition method can obtain the oil pressure value of the transmission hydraulic system in real time, enabling real-time monitoring of oil pressure fluctuations in the transmission hydraulic system. This acquisition method only enters the sampling phase after the oil pressure value of the transmission hydraulic system satisfies both the oil pressure fluctuation verification condition and the oil pressure fluctuation confirmation condition, making the acquired transmission current-oil pressure characteristic more accurate. Furthermore, this acquisition method can shorten the time required to acquire the transmission current-oil pressure characteristic, thereby improving work efficiency. Therefore, this method for acquiring the current-oil pressure characteristic of the transmission solenoid valve can not only obtain a more accurate transmission hydraulic system oil pressure value corresponding to the target current, but also shorten the time required to acquire the oil pressure value, thereby improving work efficiency.

[0084] Furthermore, if Figure 4 As shown, in step S2 of the method for obtaining the current-oil pressure characteristics of the transmission solenoid valve of this embodiment, determining whether the oil pressure value meets the oil pressure fluctuation verification condition specifically includes the following steps:

[0085] S21: Waiting time t wait After the end, obtain the oil pressure value of at least two cycles in real time and get the current oil pressure peak value P n and oil pressure trough value T n ;

[0086] S22: Calculate the current oil pressure peak value P n and oil pressure trough value T n The absolute value of the difference is the current oil pressure fluctuation value Fluc i ;

[0087] S23: If Figure 5 As shown, calculate the current oil pressure fluctuation value Fluc i Compared with the previous oil pressure fluctuation value Flux i-1 The difference is the oil pressure fluctuation attenuation value ΔFluc, and the oil pressure fluctuation identification stage ends;

[0088] S24: Determine the oil pressure fluctuation attenuation value ΔFluc and the previous oil pressure fluctuation value Fluc i-1 Is the ratio r greater than 2 / 3?

[0089] If yes, it is determined to be the current oil pressure fluctuation value Fluc i Unreliable, still using the oil pressure fluctuation value Fluc i-1 As the actual oil pressure fluctuation value Fluc n Execute step S25;

[0090] If not, it is determined to be the current oil pressure fluctuation value Fluc i Reliable, based on the current oil pressure fluctuation value Fluc i As the actual oil pressure fluctuation value Fluc n Execute step S25;

[0091] S25: Figure 5 As shown, the actual oil pressure fluctuation value Fluc is determined n Is it less than the fluctuation threshold Fluc? thrsh ;

[0092] If yes, it is determined that the oil pressure value meets the oil pressure fluctuation verification condition, and the oil pressure fluctuation verification phase ends;

[0093] If not, then after re-acquiring the oil pressure values of at least two cycles in real time, step S24 is re-executed according to the oil pressure values.

[0094] Specifically, the period refers to the time interval between two consecutive sampling points. The duration of each period can be set to 9ms, 10ms, 11ms, etc., which can be determined according to actual requirements and is not specifically limited in this embodiment.

[0095] More specifically, if Figure 3 As shown, the oil pressure peak value P is identified for the first time. n and oil pressure trough value T n The time taken for the oil pressure fluctuation attenuation value ΔFluc is the oil pressure fluctuation recognition time t distinguish The time it takes for the oil pressure value to meet the oil pressure fluctuation verification conditions is the oil pressure fluctuation verification time t check .

[0096] More specifically, in this embodiment, the oil pressure values of two cycles can be obtained in real time to obtain the current oil pressure peak value P n and oil pressure trough value T n You can also obtain the oil pressure values of three cycles, four cycles, and five cycles in real time to obtain the current oil pressure peak value P n and oil pressure trough value T n Preferably, to ensure the current oil pressure peak value P nand oil pressure trough value T n To improve the accuracy and avoid wasting computing resources, in this embodiment, the oil pressure values of four cycles are obtained in real time to obtain the current oil pressure peak value P n and oil pressure trough value T n .

[0097] More specifically, the fluctuation threshold Fluc thrsh It can be set to 3 bar, 3.2 bar, 3.5 bar, etc., which can be specifically determined according to the transmission hydraulic system, and this embodiment does not make any specific limitation to this.

[0098] It should be noted that the setting of the oil pressure fluctuation verification condition ensures the accuracy of the obtained oil pressure value of the transmission hydraulic system.

[0099] Furthermore, in step S3 of the method for acquiring the current-oil pressure characteristics of the transmission solenoid valve of this embodiment, determining whether the oil pressure value meets the oil pressure fluctuation confirmation condition specifically includes the following:

[0100] Get the actual oil pressure fluctuation value Fluc in real time n ,like Figure 3 As shown, at the oil pressure fluctuation confirmation time t debounce Real-time judgment of actual oil pressure fluctuation value Fluc within the range n Whether Fluc is always satisfied n <Fluc thrsh ;

[0101] If so, it is determined that the oil pressure value meets the oil pressure fluctuation confirmation condition;

[0102] If not, step S3 is executed again.

[0103] Specifically, the oil pressure fluctuation confirmation time t debounce The time interval can be set to 1s, 1.5s, 2s, etc., and can be determined according to actual requirements. This embodiment does not impose any specific limitation on this.

[0104] More specifically, if Figure 3 As shown, the waiting time t wait , Oil pressure fluctuation recognition time t distinguish , Oil pressure fluctuation verification time t check , Oil pressure fluctuation confirmation time t debounce and sampling time t collect The total time is longer than the fixed waiting time t in the prior art. waito After sampling time t collecto The time used for sampling and the advance time Δt. That is, t wait +t distinguish +t check +t debounce +tcollect The time and ratio t waito +t collecto is advanced by Δt compared to the time of

[0105] More specifically, if t wait +t distinguish +t check +t debounce Once the time of and reaches the waiting fixed duration t in the prior art waito , it is considered that the acquisition method of the current - oil pressure characteristic of the transmission solenoid valve times out, and at this time, it immediately enters the oil pressure sampling stage.

[0106] It should be noted that after the oil pressure value satisfies the oil pressure fluctuation verification condition, the oil pressure value may still fluctuate. During the oil pressure fluctuation confirmation time t debounce , the actual oil pressure fluctuation value Fluc n is judged in real - time whether it always satisfies Fluc n <Fluc thrsh This can further ensure the accuracy of the oil pressure value of the transmission hydraulic system, and after the oil pressure value of the transmission hydraulic system satisfies the oil pressure fluctuation verification condition and the oil pressure fluctuation confirmation condition, it can enter the sampling stage without reserving a too long waiting time, thus shortening the oil pressure value acquisition time.

[0107] Furthermore, in step S21 of the acquisition method of the current - oil pressure characteristic of the transmission solenoid valve in this embodiment, the oil pressure values of four cycles are acquired in real - time, and it is judged that the maximum value of the oil pressure values in the four cycles is the current oil pressure peak value P n , and the minimum value of the oil pressure values is the current oil pressure trough value T n .

[0108] Specifically, the oil pressure values of the four cycles are respectively represented by PrevPrevPrev, PrevPrev, Prev, and Now, which represent the oil pressure of the previous - previous - previous cycle, the oil pressure of the previous - previous cycle, the oil pressure of the previous cycle, and the current cycle oil pressure. As Figure 6 shown, when Prev > PrevPrev and Prev > Now, it is considered that the oil pressure Prev of the previous cycle is recognized as the current oil pressure peak value P n ; when PrevPrev > PrevPrevPrev, Prev > Now and PrevPrev = Prev, it is also considered that the oil pressure Prev of the previous cycle is recognized as the current oil pressure peak value P n .

[0109] As Figure 7 shown, when Prev < PrevPrev and Prev < Now, it is considered that the oil pressure Prev of the previous cycle is recognized as the current oil pressure trough value T n; When PrevPrev < PrevPrevPrev, Prev < Now and PrevPrev = Prev, it is also considered that the oil pressure Prev in the previous cycle is recognized as the current oil pressure trough value T n .

[0110] It should be noted that compared with two cycles and three cycles, the oil pressure peak value P n and the oil pressure trough value T n judged in four cycles are more accurate. Because when the oil pressure values in two of the cycles are equal, the oil pressure peak value P n and the oil pressure trough value T n judged in three cycles are not accurate enough. Judging the oil pressure peak value P n and the oil pressure trough value T n in five or six cycles will waste computing resources and increase the recognition duration and verification duration of oil pressure fluctuations, thereby increasing the oil pressure value acquisition time.

[0111] Furthermore, in step S3 of the method for obtaining the current-oil pressure characteristic of the transmission solenoid valve in this embodiment, the average value of multiple oil pressure values is calculated according to the following formula:

[0112]

[0113] where, P avg is the average value, P i is the oil pressure value, t collect is the sampling time, and ST is the duration of the cycle.

[0114] s Furthermore, the method for obtaining the current-oil pressure characteristic of the transmission solenoid valve in this embodiment further includes the following steps:

[0115] S5: Within the sampling time range, continuously calculate the current oil pressure peak value P n and the oil pressure trough value T n based on the real-time obtained oil pressure values, and judge the current maximum oil pressure value P max and the minimum oil pressure value T min in real time;

[0116] S6: Calculate the difference P max between the current maximum oil pressure value P min and the minimum oil pressure value T max -T min ;

[0117] S7: Judge whether the difference P max -T min is less than the fluctuation threshold Fluc thrsh ;

[0118] If so, the mean value is the target value;

[0119] If not, step S5 is executed again according to the oil pressure value obtained in real time.

[0120] It should be noted that the obtained oil pressure value of the transmission hydraulic system is verified in real time during the sampling process, which further improves the accuracy of the obtained oil pressure value of the transmission hydraulic system.

[0121] Example 2

[0122] This embodiment provides a system for acquiring the current-oil pressure characteristics of a transmission solenoid valve, and the acquisition system executes the method for acquiring the current-oil pressure characteristics of the transmission solenoid valve in Example 1. The acquisition system includes a current acquisition module, an oil pressure acquisition module, and an information processing module. The signal input end of the information processing module is communicatively connected to the signal output end of the current acquisition module and the signal output end of the oil pressure acquisition module, respectively. Among them, the current acquisition module is used to acquire the current value of the transmission solenoid valve, and transmit the information of the current value to the information processing module. The oil pressure acquisition module is used to acquire the oil pressure value of the transmission hydraulic system, and transmit the information of the oil pressure value to the information processing module. The information processing module processes the information of the current value and the information of the oil pressure value, and generates processing information.

[0123] Specifically, the current acquisition module can be set as a current sensor, the oil pressure acquisition module can be set as an oil pressure sensor, and the information processing module can be set as a controller.

[0124] It should be noted that after the information processing module determines that the current value obtained by the current acquisition module reaches the target current, the oil pressure acquisition module starts to obtain the oil pressure value of the transmission hydraulic system, and transmits the oil pressure value information to the information processing module for processing, and finally obtains the accurate oil pressure value of the transmission hydraulic system corresponding to the target current value.

[0125] Furthermore, in the transmission solenoid valve current-oil pressure characteristic acquisition system of this embodiment, the information processing module includes a calculation module, a first judgment module, a second judgment module, and a third judgment module. The current acquisition module transmits the acquired current value information to the first judgment module. The first judgment module determines the current value information, generates first processing information, and transmits the first processing information to the second judgment module. The oil pressure acquisition module transmits the acquired oil pressure value information to the second judgment module. The second judgment module receives the first processing information and the oil pressure value information, determines the oil pressure value information based on the first processing information, generates second processing information, and transmits the second processing information to the calculation module. The calculation module receives the second processing information, performs calculations based on the second processing information, generates calculation information, and transmits the calculation information to the third judgment module. The third judgment module determines the calculation information and generates third processing information.

[0126] Specifically, the calculation module, the first judgment module, the second judgment module and the third judgment module can be integrated into one to form an information processing module.

[0127] It should be noted that the first judgment module is used to determine whether the current value of the transmission solenoid valve reaches the target current. The second judgment module is used to determine whether the oil pressure value of the transmission hydraulic system meets the oil pressure fluctuation verification condition and the oil pressure fluctuation confirmation condition. The calculation module is used to calculate the average value of the oil pressure value within the sampling time. The third judgment module is used to determine whether the average value of the oil pressure value within the sampling time reaches the target value.

[0128] Furthermore, in the transmission solenoid valve current-oil pressure characteristic acquisition system of this embodiment, the first processed information is determining whether the current value reaches the target current. The second processed information is determining whether the oil pressure value satisfies the oil pressure fluctuation verification condition and the oil pressure fluctuation confirmation condition. The calculated information is the average of multiple oil pressure values within the sampling time range. The third processed information is determining whether the average value is the target value.

[0129] Furthermore, in the system for acquiring the current-oil pressure characteristics of the transmission solenoid valve in this embodiment, the current acquisition module is configured as a current sensor; and the oil pressure acquisition module is configured as a pressure sensor.

[0130] Specifically, the current sensor model can be set to HCD-05A current sensor, CHD-20G current sensor or other models of small current sensor. It can be set according to actual design and use requirements, and this embodiment does not make specific restrictions on this.

[0131] More specifically, the pressure sensor model can be set to PTH502 pressure sensor, PTH501F pressure sensor, and PTH715 pressure sensor. The specific setting can be based on actual design and use requirements, and this embodiment does not specifically limit this.

[0132] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A method for obtaining the current-oil pressure characteristics of a transmission solenoid valve, characterized in that: The acquisition method specifically comprises the following steps: S1: Obtaining a current value of a transmission solenoid valve of a vehicle and determining whether the current value reaches a target current; If yes, proceed to step S2; If not, continue to step S1; S2: Acquire the oil pressure value of the transmission hydraulic system in real time, and after a certain waiting time, determine whether the oil pressure value meets the oil pressure fluctuation verification condition, specifically including the following steps: S21: After the waiting time ends, the oil pressure values of at least two cycles are obtained in real time, and the current oil pressure peak value is obtained. and oil pressure trough value ; S22: Calculate the current oil pressure peak value and the oil pressure trough value The absolute value of the difference is the current oil pressure fluctuation value ; S23: Calculate the current oil pressure fluctuation value Compared with the previous oil pressure fluctuation value The difference is the oil pressure fluctuation attenuation value , the oil pressure fluctuation identification phase ends; S24: Determining the oil pressure fluctuation attenuation value The oil pressure fluctuation value mentioned above Ratio Is it greater than 2 / 3? If so, it is determined that the current oil pressure fluctuation value Unreliable, still use the oil pressure fluctuation value mentioned above As the actual oil pressure fluctuation value Execute step S25; If not, it is determined that the current oil pressure fluctuation value Reliable, based on the current oil pressure fluctuation value As the actual oil pressure fluctuation value Execute step S25; S25: Determine the actual oil pressure fluctuation value Is it less than the fluctuation threshold? ; If yes, it is determined that the oil pressure value meets the oil pressure fluctuation verification condition, the oil pressure fluctuation verification phase ends, and step S3 is executed; If not, then reacquire the oil pressure values of at least two cycles in real time and re-execute step S21 according to the oil pressure values; S3: Determining whether the oil pressure value meets the oil pressure fluctuation confirmation condition, specifically comprising the following steps: Obtain the actual oil pressure fluctuation value in real time , real-time determination of the actual oil pressure fluctuation value within the oil pressure fluctuation confirmation time range Is it always satisfied < ; If yes, it is determined that the oil pressure value meets the oil pressure fluctuation confirmation condition, and step S4 is executed; If not, re-execute step S3; S4: Entering the sampling phase, and calculating the average value of the multiple oil pressure values within the sampling time range.

2. The method for obtaining the current-oil pressure characteristics of a transmission solenoid valve according to claim 1, wherein: In step S21, the oil pressure values of four cycles are obtained in real time, and the maximum value of the oil pressure values in the four cycles is determined to be the current oil pressure peak value. The minimum value of the oil pressure value is the current oil pressure trough value .

3. The method for obtaining the current-oil pressure characteristics of a transmission solenoid valve according to claim 2, wherein: In step S4, the average value of the plurality of oil pressure values is calculated according to the following formula: ， ； in, is the average value, is the oil pressure value, is the sampling time, is the duration of the cycle.

4. The method for obtaining the current-oil pressure characteristics of a transmission solenoid valve according to any one of claims 1 to 3, characterized in that: The acquisition method further comprises the following steps: S5: within the sampling time range, continuously calculating the current oil pressure peak value according to the oil pressure value obtained in real time and the oil pressure trough value , and determine the current maximum oil pressure value in real time and minimum oil pressure ; S6: Calculate the current maximum oil pressure value and the minimum oil pressure value The difference - ; S7: Determine the difference - Is it less than the fluctuation threshold? ; If so, the average value is the target value; If not, step S5 is executed again according to the oil pressure value obtained in real time.

5. A system for acquiring the current-oil pressure characteristics of a transmission solenoid valve, characterized in that: The acquisition system executes the acquisition method according to any one of claims 1 to 4; the acquisition system includes a current acquisition module, an oil pressure acquisition module and an information processing module; the signal input end of the information processing module is respectively communicated with the signal output end of the current acquisition module and the signal output end of the oil pressure acquisition module; wherein, The current acquisition module is used to acquire the current value of the transmission solenoid valve and transmit the information of the current value to the information processing module; the oil pressure acquisition module is used to acquire the oil pressure value of the transmission hydraulic system and transmit the information of the oil pressure value to the information processing module; the information processing module processes the information of the current value and the oil pressure value and generates processing information.

6. The system for acquiring the current-oil pressure characteristics of a transmission solenoid valve according to claim 5, wherein: The information processing module includes a calculation module, a first judgment module, a second judgment module and a third judgment module; The current acquisition module transmits the acquired current value information to the first judgment module, the first judgment module judges the current value information, generates first processing information, and transmits the first processing information to the second judgment module; The oil pressure acquisition module transmits the acquired oil pressure value information to the second judgment module. The second judgment module receives the first processed information and the oil pressure value information, judges the oil pressure value information according to the first processed information, generates second processed information, and transmits the second processed information to the calculation module. The calculation module receives the second processing information, performs calculation according to the second processing information, generates calculation information, and transmits the calculation information to the third judgment module; The third judgment module judges the calculation information and generates third processing information.

7. The system for acquiring the current-oil pressure characteristics of a transmission solenoid valve according to claim 6, wherein: The first processing information is used to determine whether the current value reaches the target current; the second processing information is used to determine whether the oil pressure value satisfies the oil pressure fluctuation verification condition and the oil pressure fluctuation confirmation condition; the calculation information is the average value of multiple oil pressure values within the sampling time range; and the third processing information is used to determine whether the average value is the target value.

8. The system for acquiring the current-oil pressure characteristics of a transmission solenoid valve according to claim 7, wherein: The current acquisition module is configured as a current sensor; and the oil pressure acquisition module is configured as a pressure sensor.

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