A clutch oil filling control method and device

Abstract

The application discloses a clutch oil filling control method and device. The clutch is controlled according to the oil filling pressure to complete the oil filling. During the oil filling process of the clutch, the oil filling speed is affected by the oil filling pressure. The oil filling speed determines the oil filling time. If the oil filling pressure is close to the ideal oil filling pressure, the oil filling time is close to the ideal oil filling time. The oil filling process is considered as the ideal oil filling process. Therefore, after the oil filling is completed, the oil filling pressure is corrected based on the difference between the actual oil filling time and the ideal oil filling time, so that the target oil filling pressure is closer to the ideal oil filling pressure. Then, the clutch is controlled according to the target oil filling pressure to perform the next oil filling, so that the next oil filling is closer to the ideal oil filling process, thereby avoiding the situations of insufficient oil filling or over oil filling of the clutch during the next oil filling process.

Description

Technical Field

[0001] This application relates to the field of vehicle control technology, and in particular to a clutch oil filling control method and device. Background Technology

[0002] In a vehicle's power transmission system, the clutch is located between the engine and the gearbox. In an automatic transmission, the electronic control unit automatically controls the engagement and disengagement of the clutch, thereby separating or engaging the engine and gearbox to cut off or transmit power from the engine to the gearbox.

[0003] During clutch engagement, pressurized clutch oil enters the clutch cylinder through the oil passage, pushing and pressing the clutch friction plates, thus engaging the driving and driven wheels of the clutch to achieve synchronous movement. However, with increased service life and assembly errors in components, various parts experience varying degrees of wear and aging. Consequently, during clutch lubrication, insufficient or excessive lubrication can easily occur. If the clutch is under-lubricated, power transmission is slow, and the vehicle cannot start quickly or shift gears in a timely manner. If the clutch is over-lubricated, power transmission is too fast, generating a large impact that prevents the vehicle from starting or shifting gears smoothly.

[0004] It is evident that avoiding insufficient or excessive clutch lubrication is crucial for the smooth operation of a vehicle. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a clutch oil filling control method and device, which can prevent insufficient or excessive oil filling of the clutch during the next oil filling process.

[0006] The embodiments of this application disclose the following technical solutions:

[0007] On one hand, embodiments of this application provide a clutch oil filling control method, the method comprising:

[0008] During the current oil filling process of the clutch, the clutch is controlled to perform the current oil filling according to the current oil filling pressure;

[0009] Obtain the actual oil filling time for the clutch to complete the current oil filling;

[0010] Based on the difference between the actual filling time and the ideal filling time of the clutch, the current filling pressure is corrected to obtain the target filling pressure;

[0011] During the next oil filling process of the clutch, the clutch is controlled to perform the next oil filling according to the target oil filling pressure; the next oil filling is the next oil filling process after the current oil filling.

[0012] On the other hand, embodiments of this application provide a clutch oil filling control device, which includes a control unit, an acquisition unit, and a correction unit:

[0013] The control unit is used to control the clutch to perform the current oil filling process according to the current oil filling pressure during the current oil filling process of the clutch.

[0014] The acquisition unit is used to acquire the actual oil filling time for the clutch to complete the current oil filling;

[0015] The correction unit is used to correct the current filling pressure based on the difference between the actual filling time and the ideal filling time of the clutch, so as to obtain the target filling pressure.

[0016] The control unit is further configured to control the clutch to perform the next oil filling process according to the target oil filling pressure during the next oil filling process of the clutch; the next oil filling is the next oil filling process after the current oil filling.

[0017] As can be seen from the above technical solution, during the current clutch filling process, the clutch is controlled to fill according to the current filling pressure. After the current filling is completed, the current filling pressure is corrected to obtain the target filling pressure based on the difference between the actual filling time and the ideal filling time of the clutch. Then, in the next clutch filling process, the filling is controlled according to the corrected target filling pressure. The next filling is the next filling process after the current filling. Since controlling the clutch to fill according to different filling pressures will affect the filling speed during the clutch filling process, and the filling speed determines the filling time required to complete the filling, when the filling pressure is close to the ideal filling pressure, the filling time required to complete the filling is close to the ideal filling time. This kind of filling process can be considered an ideal filling process. It is evident that the difference between the actual and ideal filling time of a given filling cycle can characterize the deviation between the filling pressure and the ideal filling pressure. Therefore, the filling pressure is corrected based on the difference between the actual and ideal filling time, making the target filling pressure closer to the ideal filling pressure. This target filling pressure is then used to control the next filling cycle of the clutch, ensuring that the next filling cycle is closer to the ideal filling cycle than the previous one, thus preventing insufficient or excessive filling of the clutch during the next filling cycle. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of clutch parameter curves under different oil filling conditions is provided for embodiments of this application;

[0020] Figure 2 A flowchart of a clutch oil filling control method provided in this application embodiment;

[0021] Figure 3 A schematic diagram of clutch oil filling control parameter curves provided in this application embodiment;

[0022] Figure 4 This is a schematic diagram of a clutch oil filling pressure control method provided in an embodiment of this application;

[0023] Figure 5 A schematic diagram of a clutch hydraulic control circuit provided in an embodiment of this application;

[0024] Figure 6 A schematic diagram of clutch parameter curves during the next oil filling process of the clutch is provided for an embodiment of this application;

[0025] Figure 7 A schematic diagram of clutch oil filling control logic provided in an embodiment of this application;

[0026] Figure 8 This is a structural diagram of a clutch oil filling control device provided in an embodiment of this application. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0028] In a vehicle's power transmission system, the clutch is located between the engine and the gearbox. In an automatic transmission, the electronic control unit automatically controls the engagement and disengagement of the clutch, thereby separating or engaging the engine and gearbox to cut off or transmit power from the engine to the gearbox. Examples of gearboxes equipped with clutches include hybrid transmissions, hydraulic automatic transmissions, and dual-clutch transmissions.

[0029] During clutch engagement, clutch pressure oil enters the clutch cylinder through the oil passage, pushing and pressing the clutch friction plates, thus engaging the driving and driven wheels of the clutch to achieve synchronous movement. However, due to manufacturing and assembly errors of parts, as well as wear and aging of related components with increasing service life, insufficient or overfilling of the clutch can easily occur during the lubrication process, leading to shocks in the vehicle.

[0030] like Figure 1 The diagram shown illustrates the clutch parameter curves under different oil-filling conditions. Specifically:

[0031] In response to the clutch engagement request, the clutch is controlled to engage from time t0, which is the time when the clutch begins to fill with oil. Under ideal oil-filling conditions, the clutch completes oil filling at time t2, and the gap between the clutch friction plates is completely eliminated. During the subsequent time interval t2-t3, the actual oil filling pressure of the clutch gradually increases, while the clutch input speed (clutch driving wheel speed) slowly decreases, gradually synchronizing with the clutch output speed (clutch driven wheel speed). At time t3, the clutch driving and driven wheels are synchronized. Throughout the entire process, the actual oil filling pressure and speed of the clutch change smoothly without any shock.

[0032] Under overfilling conditions, due to the rapid filling speed, the clutch completes filling at time t1, and the clutch... Figure 1 It can be seen that during the entire oil filling process (t0-t1), there is a large pressure overshoot. After the oil filling is completed, the clutch input speed drops rapidly to be synchronized with the clutch output speed, thus generating a shock.

[0033] Under insufficient oil filling conditions, due to the slow filling speed, a gap exists between the clutch friction plates throughout the entire filling process (t0-t3). Initially, to eliminate this gap, the actual clutch filling pressure rises slowly. After filling is completed at time t3, the actual clutch filling pressure increases rapidly, while the clutch input speed drops rapidly to synchronize with the clutch output speed, resulting in a shock. Furthermore, under insufficient oil filling conditions, the slow filling speed and prolonged filling process lead to a slower vehicle power response, causing problems such as difficulty in quick starts and timely gear shifting.

[0034] To address the aforementioned technical problems, this application provides a clutch oil filling control method and apparatus, which adjusts the next oil filling process based on the current oil filling status of the clutch, thereby preventing insufficient or excessive oil filling of the clutch during the next oil filling process.

[0035] The clutch oil filling control method provided in this application can be implemented using computer equipment, which can be a terminal device or a server. The server can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. Terminal devices include, but are not limited to, mobile phones, computers, intelligent voice interaction devices, smart home appliances, and vehicle terminals. The terminal devices and servers can be directly or indirectly connected via wired or wireless communication, and this application does not impose any limitations in this regard.

[0036] The following examples illustrate this in detail:

[0037] Figure 2 A flowchart of a clutch oil filling control method provided in this application embodiment is used as an example to illustrate the method, which includes S201-S204:

[0038] S201: During the current oil filling process of the clutch, the clutch is controlled to perform the current oil filling according to the current oil filling pressure.

[0039] During vehicle operation, when clutch engagement is required, the terminal equipment responds to the clutch engagement request by controlling clutch hydraulic oil to flow through the clutch filling line into the clutch drive cylinder, thereby controlling the clutch filling process corresponding to the clutch engagement. Specifically, the terminal equipment can control the clutch filling process by controlling the clutch filling pressure parameter. During any given clutch filling process, the target filling pressure for that specific filling cycle can be used. That is, during a given clutch filling cycle, the clutch can be controlled to perform that specific filling based on the target filling pressure for that particular cycle.

[0040] Understandably, during vehicle operation, the clutch may need to be switched between engaged and disengaged states multiple times depending on changes in driving demands. "Current oil filling" refers only to the oil filling process corresponding to the current engagement of the clutch; that is, "current oil filling" can be any oil filling during the entire driving process. For example, "current oil filling" could be the first oil filling after the vehicle starts moving, or it could be the Nth (N>1)th oil filling during the vehicle's operation.

[0041] The filling pressure can be set according to actual conditions, and this application does not impose any limitations on it. For example, it can be set according to the specific number of fillings during vehicle operation. Specifically, if the current filling is the first filling after the vehicle starts moving, the current filling pressure can be the preset filling pressure of the clutch, which can be the default setting parameter of the clutch; if the current filling is not the first filling, the current filling pressure can be the preset filling pressure, or it can be the filling pressure obtained by correcting the preset filling pressure based on the previous filling situation. For example, if the current filling is the second filling, the current filling pressure can be the preset filling pressure, or it can be the filling pressure obtained by correcting the preset filling pressure based on the first filling situation.

[0042] S202: Obtain the actual oil filling time for the clutch to complete the current oil filling.

[0043] After the clutch completes the current oil filling, the actual oil filling time can be obtained. This allows for comparison with the clutch's ideal oil filling time, analysis of the current oil filling situation, and subsequent adjustment of the next oil filling based on the current oil filling situation.

[0044] As can be seen, the actual filling time is a parameter used to evaluate the filling situation of a single clutch operation. For a single clutch filling operation, it refers to the start of filling in response to a clutch engagement request and the end of filling when the driving and driven wheels of the clutch are fully engaged. Therefore, whenever the clutch is filled, the start and end times of filling can be recorded, and the time interval between these times can be recorded as the filling time. In other words, recording the filling time allows for the evaluation of the specific circumstances of a single clutch filling operation, and thus the parameter of actual filling time can be determined based on the recorded filling time. It should be noted that the method for determining the actual filling time based on the recorded filling time can be set according to actual circumstances, and this application does not impose any limitations on this.

[0045] Understandably, for the normal clutch filling process, the recorded filling time is the aforementioned actual filling time. However, in actual driving, due to situations such as "false filling" and "filling timeout," for example, when clutch control is unstable at the beginning of vehicle start-up, the terminal equipment may mistakenly identify some collected signals as clutch filling. To make the control of the next filling based on the current filling more accurate, one possible approach is to first obtain the minimum and maximum filling times of the clutch. The filling time range identified by the minimum and maximum filling times characterizes the range of time used in the normal clutch filling process. Therefore, the actual filling time can be determined based on the relationship between the recorded filling time and the minimum and maximum filling times, avoiding the deviation caused by directly using the recorded filling time as the actual filling time.

[0046] After obtaining the minimum and maximum oil filling times, S202 may include the following steps:

[0047] S2021: During the current oil filling process of the clutch, the duration of the current oil filling is recorded as the oil filling duration.

[0048] S2022: If the recorded oil filling time is greater than the minimum oil filling time but less than the maximum oil filling time, the recorded oil filling time shall be determined as the actual oil filling time.

[0049] S2023: If the recorded filling time is less than or equal to the minimum filling time, the minimum filling time shall be determined as the actual filling time;

[0050] S2024: If the recorded filling time is greater than or equal to the maximum filling time, the maximum filling time shall be determined as the actual filling time.

[0051] Specifically, during the current clutch filling process, the terminal equipment can record the duration of the current filling as the recorded filling duration. If the recorded filling duration falls within the range defined by the minimum and maximum filling durations, the filling process corresponding to this recorded duration is considered a normal filling process, and the recorded filling duration can be used as the actual filling duration. If the recorded filling duration is less than or equal to the minimum filling duration, the filling process corresponding to this recorded duration is considered potentially an incorrect filling process or insufficient filling, and the minimum filling duration can be determined as the actual filling duration. If the recorded filling duration is greater than or equal to the maximum filling duration, the filling process corresponding to this recorded duration is considered potentially an excessive filling process, and the maximum filling duration can be used as the actual filling duration. Based on this, the actual filling time is determined according to the relationship between the recorded filling time and the minimum and maximum filling times. This actual filling time is a reference parameter for adjusting the next filling, thereby avoiding the deviation caused by directly using the recorded filling time as the actual filling time.

[0052] See Figure 3 , Δt min and Δt max These represent the minimum and maximum oil filling times for the clutch, respectively. t0 is the start time of oil filling, and t1, t2, and t3 are the completion times under overfilling, ideal filling, and underfilling conditions, respectively. In other words, Δt1, Δt2, and Δt3 are the recorded oil filling times under these conditions, respectively. min Δt max The actual filling time is determined by the size relationship between the two. For details, please refer to the above content.

[0053] In practical applications, the minimum and maximum filling times can be set according to actual conditions, and this application does not impose any limitations on this. For example, they can be set based on the vehicle's hardware configuration and normal driving conditions, or based on the engineer's engineering experience, or based on the ideal filling time of the clutch. For ease of understanding, the following embodiments of this application are provided as examples:

[0054] The clutch filling time correction coefficient can be obtained, and then the minimum and maximum filling times can be determined based on the correction coefficient and the ideal filling time. The ideal filling time refers to the time required for the clutch to complete one filling cycle under ideal filling conditions. For example, based on multiple filling tests of the clutch, a filling time correction coefficient of 5% can be determined. The ideal filling time can then be adjusted downwards and upwards by 5% to determine the minimum and maximum filling times.

[0055] Depend on Figure 1 It is known that during the entire oil filling process, the actual oil filling pressure of the clutch will change with the completion of oil filling. Therefore, the oil filling end time of the clutch can be determined based on the change in the actual oil filling pressure of the clutch, and the oil filling duration can be determined and recorded accordingly. That is, in one possible implementation, S2021 may include the following steps:

[0056] In response to the clutch's current engagement request, control the clutch to perform current oil filling;

[0057] The moment the current combination request is received shall be taken as the start moment of the current refueling;

[0058] During the current oil filling process, the curve of the actual oil filling pressure of the clutch as a function of the oil filling time is collected.

[0059] Determine the inflection point of the curve;

[0060] The oil filling time corresponding to the inflection point is taken as the end time of the current oil filling.

[0061] The time interval between the start and end times is recorded as the oil filling duration.

[0062] Specifically, the clutch's current engagement request indicates the need for current lubrication. Therefore, in response to the current engagement request, the clutch can be lubricated, and the moment the engagement request is received can be taken as the start time of the current lubrication. During the entire lubrication process, the actual lubrication pressure of the clutch can be collected as a curve of change with the lubrication duration. By analyzing the rate of change of the actual lubrication pressure with the lubrication duration, the inflection point of the curve can be determined. Since the gap between the clutch friction plates will be completely eliminated when the clutch lubrication is completed, the actual lubrication pressure of the clutch will change significantly compared to before the lubrication is completed. Therefore, when the curve shows an inflection point, the lubrication can be considered complete, and the lubrication time corresponding to the inflection point can be taken as the end time of the current lubrication. The time interval between the start and end times is recorded as the lubrication duration.

[0063] See Figure 3 Based on the inflection point of the curve showing the change in actual filling pressure with filling time, t1, t2, and t3 can be determined as the times when filling is completed under overfilling, ideal filling, and underfilling conditions, respectively. Throughout the process, a flag can be set to control clutch filling when it is determined that filling control is required.

[0064] If, during a single oil filling process, the aforementioned curve fails to reach an inflection point after a prolonged period, it indicates that the clutch has failed to complete oil filling since its commencement. This type of oil filling can be considered an overtimed oil filling condition, which can easily lead to a dead loop in clutch oil filling control, causing the vehicle to be unable to start or shift gears. To avoid this situation, in one possible implementation, if the cumulative oil filling time from the start exceeds the clutch's maximum oil filling time, and the aforementioned curve has not yet reached an inflection point, then the oil filling is considered an overtimed oil filling condition. In this case, the clutch can be controlled to disengage from the current oil filling. That is, when an overtimed oil filling condition occurs, the oil filling can be forcibly disengaged, thereby preventing the clutch oil filling from entering a dead loop due to the overtimed oil filling condition, which would cause problems such as the vehicle being unable to start or shift gears.

[0065] S203: Based on the difference between the actual filling time and the ideal filling time of the clutch, the filling pressure for the current cycle is corrected to obtain the target filling pressure.

[0066] During the clutch filling process, controlling the filling speed according to different filling pressures affects the filling rate, which in turn determines the filling time. When the filling pressure is close to the ideal filling pressure, the filling time is also close to the ideal filling time; this filling process can be considered an ideal filling process. Therefore, the difference between the actual filling time and the ideal filling time of a given filling can characterize the deviation between the current filling pressure and the ideal filling pressure. Thus, the current filling pressure can be corrected based on this difference to obtain the target filling pressure. The next filling can then be controlled according to the target filling pressure, making the next filling process closer to the ideal filling process than the current one, thereby avoiding underfilling or overfilling of the clutch during the next filling process.

[0067] It should be noted that the method for correcting the filling pressure based on the difference between the actual filling time and the ideal filling time can be set according to the actual situation, and this application does not impose any limitations on it. For ease of understanding, the following methods are provided as examples in the embodiments of this application:

[0068] Since the difference between the actual filling time and the ideal filling time reflects the deviation between the current filling and the ideal filling, that is, the magnitude of the difference can characterize the degree of deviation of the current filling from the ideal filling, and the filling pressure deviation value is a parameter determined based on this difference to correct the current filling pressure, and the target filling pressure obtained after correction is closer to the ideal filling pressure than the current filling pressure, that is, the filling pressure deviation value can also characterize the degree of deviation of the current filling from the ideal filling. Therefore, in one possible implementation, S203 may include the following steps:

[0069] S2031: Determine the clutch filling pressure deviation value based on the difference between the actual filling time and the ideal filling time;

[0070] S2032: If the difference is greater than zero, the sum of the current filling pressure and the filling pressure deviation value shall be used as the target filling pressure;

[0071] S2033: If the difference is less than zero, the difference between the current filling pressure and the filling pressure deviation value shall be taken as the target filling pressure.

[0072] Specifically, when the difference is greater than zero, it indicates that the actual filling time is longer than the ideal filling time. This type of filling process is called underfilling, meaning that the filling speed is slow during the current filling process controlled by the current filling pressure. Therefore, the filling speed can be increased by increasing the filling pressure. Thus, the sum of the current filling pressure and the deviation of the current filling pressure can be used as the target filling pressure. Similarly, when the difference is less than zero, it is called overfilling. In this case, the filling pressure can be reduced, and the difference between the current filling pressure and the deviation of the current filling pressure can be used as the target filling pressure.

[0073] See Figure 4 t0 represents the start of oil filling, while t1 and t2 represent the completion of oil filling and the full engagement of the clutch's driving and driven wheels, respectively. Δt1 and Δt2 are the oil filling duration and the duration of full clutch engagement, respectively. BasePres is the current oil filling pressure. The oil filling pressure deviation value, Offset, is determined based on the difference between the actual and ideal oil filling duration. Therefore, for underfilling conditions, BasePres + Offset is used as the target oil filling pressure; for overfilling conditions, BasePres - Offset is used as the target oil filling pressure. This ensures that the clutch input speed during the next oil filling, controlled by the target oil filling pressure, can smoothly decrease to the clutch output speed.

[0074] To quickly determine the filling pressure deviation value, in one possible implementation, S2031 may include the following steps:

[0075] Obtain the mapping relationship between the clutch filling time difference and the filling pressure deviation;

[0076] Based on the mapping relationship, determine the oil filling pressure deviation value corresponding to the difference.

[0077] It should be noted that the form of the mapping relationship can be set according to the actual situation, and this application does not impose any limitations on it. For example, in one possible implementation, the mapping relationship can be a pre-calibrated mapping table, in which each difference corresponds to an oil filling pressure deviation value. In another possible implementation, the mapping relationship can be a function expression determined based on engineering experiments, which represents the functional relationship between the difference and the oil filling pressure deviation value. Once the mapping relationship is obtained, the oil filling pressure deviation value corresponding to the aforementioned difference can be determined according to the mapping relationship, so as to correct the current oil filling pressure based on the oil filling pressure deviation value.

[0078] Understandably, for any clutch, upon completion of production, there is a preset filling time parameter, which characterizes the ideal time required for the clutch to complete one filling cycle. That is, the preset filling time is the clutch's initial default ideal filling time. In other words, after the clutch is installed in a vehicle, the aforementioned ideal filling time can be the preset filling time. However, due to configuration errors and wear and aging of components during vehicle use, the preset filling time may no longer accurately represent the ideal filling time of the clutch in actual use. Therefore, the preset filling time can be recalibrated to obtain the ideal filling time, making this calibrated parameter more accurate in representing the ideal time required for the clutch to complete one filling cycle in actual use. Therefore, in one possible implementation, the preset filling time of the clutch can be obtained, and then, when the preset filling time meets the calibration conditions for the clutch's ideal filling time, the preset filling time can be calibrated to obtain the ideal filling time. Based on this, the parameter of ideal filling time can accurately characterize the ideal time required for the clutch to complete one filling in actual use. It can then be used as a reference benchmark to evaluate the deviation between the current filling and the ideal filling, making the control of the next filling based on the current filling situation more accurate.

[0079] It should be noted that the method for determining whether the preset oil filling time meets the ideal oil filling time calibration conditions of the clutch can be set according to the actual situation, and this application does not impose any limitations on it. For ease of understanding, the following method is provided as an example in the embodiments of this application:

[0080] In one possible implementation, a threshold for the number of clutch filling times can be set. Whenever the cumulative number of clutch filling times reaches this threshold, it can be determined that the ideal filling time calibration condition of the clutch is met. At this time, a calibration process is performed to redetermine the ideal filling time.

[0081] Specifically, the calibration process may include the following steps:

[0082] Under the ideal oil filling time calibration condition of the clutch, control the clutch hydraulic oil to fill the clutch drive cylinder through the clutch oil filling line;

[0083] The clutch filling flow rate is determined based on the oil resistance of the clutch filling line, the main oil circuit pressure of the clutch filling line, and the clutch pressure.

[0084] The actual oil volume in the clutch drive cylinder is obtained by integrating the oil filling flow rate with the oil filling time.

[0085] The integral time when the actual oil volume equals the maximum oil volume of the clutch drive cylinder is taken as the ideal oil filling time.

[0086] The ideal filling time calibration condition is the same as the filling condition corresponding to the aforementioned calibration process. For a clearer understanding of the process, please refer to... Figure 5 This is a schematic diagram of a clutch hydraulic control circuit provided in an embodiment of this application. Under the ideal oil filling time calibration condition, the clutch hydraulic oil can be controlled to fill the clutch drive cylinder through the clutch oil filling pipeline. The oil filling flow rate is determined based on the oil resistance of the oil filling pipeline, the main oil circuit pressure, and the clutch pressure. Then, the oil filling flow rate is integrated with the oil filling time. The result of the integration is the actual oil volume in the clutch drive cylinder. When the actual oil volume is equal to the maximum oil volume of the clutch drive cylinder, it indicates that the oil filling is completed. Therefore, the integrated time at this time can be used as the ideal oil filling time. Based on this, the aforementioned calibration process is completed to obtain the ideal oil filling time.

[0087] The clutch filling pipeline, through which the control hydraulic oil enters the drive cylinder, includes the main oil circuit, the spool valve inlet passage, the spool valve, and the clutch inlet passage. That is, the control hydraulic oil starts from the main oil circuit, passes through the spool valve inlet passage, the spool valve, and the clutch inlet passage, and finally enters the clutch drive cylinder. Simultaneously, some hydraulic oil in the drive cylinder leaks into the oil pan through the seal gaps. The resistance of the oil as it passes through each pipeline can be defined as oil resistance. Therefore, the oil resistance of the clutch filling pipeline includes the oil resistance of the spool valve inlet passage, the oil resistance of the spool valve assembly, the oil resistance of the clutch inlet passage, and the oil resistance from clutch assembly leakage. The filling flow rate can then be determined using the following formula:

[0088]

[0089] Where Q is the oil flow rate of the clutch, and P ML Main oil circuit pressure, P clutch For clutch pressure, R US R is the oil resistance in the inlet passage of the slide valve. V R represents the oil resistance of the spool valve assembly.DS R is the oil resistance of the clutch inlet oil passage. Leak This refers to the oil resistance caused by leakage in the clutch assembly.

[0090] Then, by integrating the oil filling time with the oil filling flow rate according to the following formula, the actual oil volume in the clutch drive cylinder is obtained:

[0091]

[0092] Among them, V clutchFilled This represents the actual volume of oil in the clutch drive cylinder. Then, V is calculated. clutchFilled Starting from 0, it changes until it equals the maximum oil volume V of the clutch drive cylinder. clutchMax The integral time can be used as the ideal oil filling time for the clutch.

[0093] S204: During the next oil filling process of the clutch, control the clutch to perform the next oil filling according to the target oil filling pressure.

[0094] Because the target filling pressure is closer to the ideal filling pressure than the current filling pressure, the next filling process of the clutch can be controlled based on this target filling pressure. The next filling process is the one immediately following the current filling process. This ensures that the next filling process is closer to the ideal filling process than the current filling process, thus avoiding insufficient or overfilling of the clutch during the next filling process.

[0095] like Figure 6 The diagram shows the clutch parameter curves during the next oil filling process controlled by the target oil filling pressure. At time t0, in response to the clutch's next engagement request, oil filling begins. Oil filling is completed at time t1, at which point the clutch friction plates are in a slight contact state, and the clutch input speed is gradually pulled down to a state synchronized with the clutch output speed. At time t2, the clutch engages smoothly without any impact. This process reduces vehicle shift delay and improves vehicle power transmission efficiency.

[0096] As can be seen, this application provides a method for adjusting the next oil filling based on the current oil filling condition. If the current oil filling condition is abnormal, adjusting the next oil filling based on the current oil filling will result in a deviation in the adjustment. To avoid this, before S204, the oil filling control conditions of the clutch can be judged. If the oil filling control conditions meet the preset conditions, S204 can be executed to complete the adjustment of the next oil filling based on the current oil filling. It can be understood that if the oil filling control conditions do not meet the preset conditions, S204 can be omitted, and the clutch can be controlled to perform the next oil filling according to the default preset oil filling pressure of the clutch.

[0097] It should be noted that the step of judging the clutch oil filling control conditions only needs to be executed before S204, and the execution order of S201-S203 can be set according to the actual situation. This application does not impose any restrictions on this. For example, the judgment step can be executed before S202. Based on this, S202-S204 is only executed when the oil filling control conditions meet the preset conditions. The next oil filling is adjusted based on the current oil filling, which can avoid the waste of computer resources caused by S202-S203 being executed but S204 not being executed because the oil filling control conditions do not meet the preset conditions.

[0098] The preset conditions can be set according to actual conditions, and this application does not impose any limitations on them. For example, the temperature of the clutch hydraulic oil directly affects the flow rate of the oil in the clutch filling line, that is, the oil temperature directly affects the filling speed of the clutch. Therefore, the aforementioned preset condition can be set to ensure that the clutch hydraulic oil temperature is within a preset temperature range. In addition, preset conditions may also include related conditions such as the engine being within its normal speed range and the absence of any faults in the vehicle's transmission control system.

[0099] As can be seen from the above technical solution, during the current clutch filling process, the clutch is controlled to fill according to the current filling pressure. After the current filling is completed, the current filling pressure is corrected to obtain the target filling pressure based on the difference between the actual filling time and the ideal filling time of the clutch. Then, in the next clutch filling process, the filling is controlled according to the corrected target filling pressure. The next filling is the next filling process after the current filling. Since controlling the clutch to fill according to different filling pressures will affect the filling speed during the clutch filling process, and the filling speed determines the filling time required to complete the filling, when the filling pressure is close to the ideal filling pressure, the filling time required to complete the filling is close to the ideal filling time. This kind of filling process can be considered an ideal filling process. It is evident that the difference between the actual and ideal filling time of a given filling cycle can characterize the deviation between the filling pressure and the ideal filling pressure. Therefore, the filling pressure is corrected based on the difference between the actual and ideal filling time, making the target filling pressure closer to the ideal filling pressure. This target filling pressure is then used to control the next filling cycle of the clutch, ensuring that the next filling cycle is closer to the ideal filling cycle than the previous one, thus preventing insufficient or excessive filling of the clutch during the next filling cycle.

[0100] Figure 7This is a schematic diagram of clutch oil filling control logic provided in an embodiment of this application. Specifically, in response to the current engagement request of the clutch, the clutch can be controlled to start engaging, and the clutch oil filling control conditions can be judged. If the clutch oil filling control conditions meet the preset conditions, the subsequent adjustment steps are performed to perform clutch oil filling control; if the preset conditions are not met, the subsequent adjustment steps are not performed, that is, the clutch oil filling control is exited.

[0101] In clutch oil filling control, the clutch can be controlled to perform oil filling based on the current oil filling pressure. During this process, the changes in the actual oil filling pressure of the clutch are collected in real time (specifically, the changes in the actual oil filling pressure with the oil filling time are collected to determine the actual oil filling pressure change curve). Simultaneously, the clutch oil filling flow rate can be estimated, and the ideal oil filling time is calibrated based on the flow rate. The minimum and maximum oil filling times of the clutch are then determined based on the ideal oil filling time. When an inflection point is detected in the actual oil filling pressure change curve, the oil filling is considered complete, and the oil filling completion flag is set, determining the actual oil filling time. The actual oil filling time is then compared with the ideal oil filling time, and the current oil filling pressure is corrected based on the difference to obtain the target oil filling pressure. It should be noted that if no inflection point is detected in the actual oil filling pressure change curve during the oil filling process, it is confirmed as an oil filling timeout condition. In this case, the oil filling is forcibly terminated, and the maximum oil filling time is used as the actual oil filling time to correct the current oil filling pressure to obtain the target oil filling pressure.

[0102] It is understood that this basically corresponds to the method embodiment, so relevant details can be found in the description of the method embodiment.

[0103] Figure 8 This is a structural diagram of a clutch oil filling control device provided in an embodiment of this application. The device includes a control unit 801, an acquisition unit 802, and a correction unit 803.

[0104] The control unit 801 is used to control the clutch to perform the current oil filling process according to the current oil filling pressure during the current oil filling process of the clutch.

[0105] The acquisition unit 802 is used to acquire the actual oil filling time for the clutch to complete the current oil filling;

[0106] The correction unit 803 is used to correct the current filling pressure based on the difference between the actual filling time and the ideal filling time of the clutch, so as to obtain the target filling pressure.

[0107] The control unit 801 is further configured to control the clutch to perform the next oil filling process according to the target oil filling pressure during the next oil filling process of the clutch; the next oil filling is the next oil filling process after the current oil filling.

[0108] Optionally, the correction unit is further configured to:

[0109] The oil filling pressure deviation value of the clutch is determined based on the difference between the actual oil filling time and the ideal oil filling time.

[0110] If the difference is greater than zero, the sum of the current filling pressure and the filling pressure deviation value shall be taken as the target filling pressure;

[0111] If the difference is less than zero, the difference between the current filling pressure and the filling pressure deviation value shall be taken as the target filling pressure.

[0112] Optionally, the correction unit is further configured to:

[0113] Obtain the mapping relationship between the difference in oil filling time and the deviation in oil filling pressure of the clutch;

[0114] Based on the mapping relationship, the oil filling pressure deviation value corresponding to the difference is determined.

[0115] Optionally, the acquisition unit is further configured to:

[0116] Obtain the minimum and maximum oil filling times of the clutch;

[0117] During the current oil filling process of the clutch, the duration of the current oil filling is recorded as the oil filling duration.

[0118] If the recorded oil filling time is greater than the minimum oil filling time and less than the maximum oil filling time, the recorded oil filling time is determined as the actual oil filling time.

[0119] If the recorded oil filling time is less than or equal to the minimum oil filling time, the minimum oil filling time is determined as the actual oil filling time;

[0120] If the recorded filling time is greater than or equal to the maximum filling time, the maximum filling time is determined as the actual filling time.

[0121] Optionally, the acquisition unit is further configured to:

[0122] Obtain the oil filling time correction coefficient for the clutch;

[0123] The minimum oil filling time and the maximum oil filling time are determined based on the oil filling time correction coefficient and the ideal oil filling time.

[0124] Optionally, the acquisition unit is further configured to:

[0125] In response to the current engagement request of the clutch, control the clutch to perform the current oil filling;

[0126] The moment when the current combination request is received shall be taken as the start moment of the current oil filling;

[0127] During the current oil filling process, the curve of the actual oil filling pressure of the clutch changing with the oil filling time is collected.

[0128] Determine the inflection point of the change curve;

[0129] The oil filling time corresponding to the inflection point is taken as the end time of the current oil filling.

[0130] The time interval between the start time and the end time is recorded as the recorded oil filling time.

[0131] Optionally, the control unit is further configured to:

[0132] If the cumulative oil filling time from the start time exceeds the maximum oil filling time, and the change curve does not show the inflection point, the clutch is controlled to disengage from the current oil filling.

[0133] Optionally, a calibration unit may also be included, the calibration unit being used for:

[0134] Obtain the preset oil filling time of the clutch;

[0135] If the preset oil filling time meets the ideal oil filling time calibration condition of the clutch, the preset oil filling time is calibrated to obtain the ideal oil filling time.

[0136] Optionally, the calibration unit is further configured to:

[0137] Under the ideal oil filling time calibration condition of the clutch, the clutch hydraulic oil is controlled to be filled into the clutch drive cylinder through the clutch oil filling line;

[0138] The clutch filling flow rate is determined based on the oil resistance of the clutch filling line, the main oil line pressure of the clutch filling line, and the clutch pressure.

[0139] The actual oil volume in the clutch drive cylinder is obtained by integrating the oil filling flow rate with the oil filling time.

[0140] The integral time when the actual oil volume equals the maximum oil volume of the clutch drive cylinder is taken as the ideal oil filling time.

[0141] As can be seen from the above technical solution, during the current clutch filling process, the clutch is controlled to fill according to the current filling pressure. After the current filling is completed, the current filling pressure is corrected to obtain the target filling pressure based on the difference between the actual filling time and the ideal filling time of the clutch. Then, in the next clutch filling process, the filling is controlled according to the corrected target filling pressure. The next filling is the next filling process after the current filling. Since controlling the clutch to fill according to different filling pressures will affect the filling speed during the clutch filling process, and the filling speed determines the filling time required to complete the filling, when the filling pressure is close to the ideal filling pressure, the filling time required to complete the filling is close to the ideal filling time. This kind of filling process can be considered an ideal filling process. It is evident that the difference between the actual and ideal filling time of a given filling cycle can characterize the deviation between the filling pressure and the ideal filling pressure. Therefore, the filling pressure is corrected based on the difference between the actual and ideal filling time, making the target filling pressure closer to the ideal filling pressure. This target filling pressure is then used to control the next filling cycle of the clutch, ensuring that the next filling cycle is closer to the ideal filling cycle than the previous one, thus preventing insufficient or excessive filling of the clutch during the next filling cycle.

[0142] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0143] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0144] The above provides a detailed description of a clutch oil filling control method and apparatus according to embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method of this application. Furthermore, those skilled in the art will recognize that variations in the specific implementation methods and application scope may occur based on the method of this application.

[0145] In summary, the content of this specification should not be construed as limiting this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. Furthermore, based on the implementation methods provided in the above aspects, this application can be further combined to provide more implementation methods.

Claims

1. A clutch oil filling control method, characterized in that, The method includes: During the current oil filling process of the clutch, the clutch is controlled to perform the current oil filling according to the current oil filling pressure; Obtain the actual oil filling time for the clutch to complete the current oil filling; Based on the difference between the actual filling time and the ideal filling time of the clutch, the current filling pressure is corrected to obtain the target filling pressure; During the next oil filling process of the clutch, the clutch is controlled to perform the next oil filling according to the target oil filling pressure; the next oil filling is the next oil filling process after the current oil filling. The step of correcting the current filling pressure based on the difference between the actual filling time and the ideal filling time of the clutch to obtain the target filling pressure includes: The oil filling pressure deviation value of the clutch is determined based on the difference between the actual oil filling time and the ideal oil filling time. If the difference is greater than zero, the sum of the current filling pressure and the filling pressure deviation value shall be taken as the target filling pressure; If the difference is less than zero, the difference between the current filling pressure and the filling pressure deviation value shall be taken as the target filling pressure; And, determining the clutch filling pressure deviation value based on the difference between the actual filling time and the ideal filling time includes: Obtain the mapping relationship between the difference in oil filling time and the deviation in oil filling pressure of the clutch; Based on the mapping relationship, the oil filling pressure deviation value corresponding to the difference is determined.

2. The method according to claim 1, characterized in that, Also includes: Obtain the minimum and maximum oil filling times of the clutch; The process of obtaining the actual oil filling time for the clutch to complete the current oil filling includes: During the current oil filling process of the clutch, the duration of the current oil filling is recorded as the oil filling duration. If the recorded oil filling time is greater than the minimum oil filling time and less than the maximum oil filling time, the recorded oil filling time is determined as the actual oil filling time. If the recorded oil filling time is less than or equal to the minimum oil filling time, the minimum oil filling time is determined as the actual oil filling time; If the recorded filling time is greater than or equal to the maximum filling time, the maximum filling time is determined as the actual filling time.

3. The method according to claim 2, characterized in that, The process of obtaining the minimum and maximum oil filling times of the clutch includes: Obtain the oil filling time correction coefficient for the clutch; The minimum oil filling time and the maximum oil filling time are determined based on the oil filling time correction coefficient and the ideal oil filling time.

4. The method according to claim 2, characterized in that, The recording of the duration of the current oil filling operation of the clutch, as the recorded oil filling duration, includes: In response to the current engagement request of the clutch, control the clutch to perform the current oil filling; The moment when the current combination request is received shall be taken as the start moment of the current oil filling; During the current oil filling process, the curve of the actual oil filling pressure of the clutch changing with the oil filling time is collected. Determine the inflection point of the change curve; The oil filling time corresponding to the inflection point is taken as the end time of the current oil filling. The time interval between the start time and the end time is recorded as the recorded oil filling time.

5. The method according to claim 4, characterized in that, Also includes: If the cumulative oil filling time from the start time exceeds the maximum oil filling time, and the change curve does not show the inflection point, the clutch is controlled to disengage from the current oil filling.

6. The method according to any one of claims 1-5, characterized in that, Also includes: Obtain the preset oil filling time of the clutch; If the preset oil filling time meets the ideal oil filling time calibration condition of the clutch, the preset oil filling time is calibrated to obtain the ideal oil filling time.

7. The method according to claim 6, characterized in that, The calibration of the preset filling time to obtain the ideal filling time includes: Under the ideal oil filling time calibration condition of the clutch, the clutch hydraulic oil is controlled to be filled into the clutch drive cylinder through the clutch oil filling line; The clutch filling flow rate is determined based on the oil resistance of the clutch filling line, the main oil line pressure of the clutch filling line, and the clutch pressure. The actual oil volume in the clutch drive cylinder is obtained by integrating the oil filling flow rate with the oil filling time. The integral time when the actual oil volume equals the maximum oil volume of the clutch drive cylinder is taken as the ideal oil filling time.

8. A clutch oil filling control device, characterized in that, The device includes a control unit, an acquisition unit, and a correction unit: The control unit is used to control the clutch to perform the current oil filling process according to the current oil filling pressure during the current oil filling process of the clutch. The acquisition unit is used to acquire the actual oil filling time for the clutch to complete the current oil filling; The correction unit is used to correct the current filling pressure based on the difference between the actual filling time and the ideal filling time of the clutch, so as to obtain the target filling pressure. The control unit is further configured to control the clutch to perform the next oil filling process according to the target oil filling pressure during the next oil filling process of the clutch; the next oil filling is the next oil filling process after the current oil filling. The correction unit is further configured to: The oil filling pressure deviation value of the clutch is determined based on the difference between the actual oil filling time and the ideal oil filling time. If the difference is greater than zero, the sum of the current filling pressure and the filling pressure deviation value shall be taken as the target filling pressure; If the difference is less than zero, the difference between the current filling pressure and the filling pressure deviation value shall be taken as the target filling pressure; Furthermore, the correction unit is also used for: Obtain the mapping relationship between the difference in oil filling time and the deviation in oil filling pressure of the clutch; Based on the mapping relationship, the oil filling pressure deviation value corresponding to the difference is determined.

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