Cooling and lubrication control method and system for a clutch

Abstract

The application provides a cooling and lubricating control method and system of a clutch, which comprises the following steps: determining the working state of an engine after the gearbox controller is powered on; if the starting is not completed, controlling the electronic pump to work or not to work; if the starting is completed, controlling the electronic pump to work to supplement the lubricating oil; and determining whether the clutch transmits torque after the supplementing time; if the clutch does not transmit torque, determining the working state of the engine; if the engine stops running, continuously determining whether the starting of the engine is completed; if the engine continues to run, determining whether the shift fork moves; if the shift fork does not move, continuously determining whether the clutch transmits torque; if the shift fork moves, controlling the electronic pump to work to supplement the lubricating oil. If the clutch transmits torque, controlling the electronic pump to work to supplement the lubricating oil. According to different control modes, the working state of the electronic pump is controlled, the lubricating oil of the cooling and lubricating oil channel can be supplemented in time according to the heat dissipation requirement of the clutch, and the clutch can work safely.

Description

TECHNICAL FIELD

[0001] The present application relates to the clutch cooling control technical field, particularly relates to a kind of cooling lubrication control method and system of clutch. BACKGROUND

[0002] At present, since wet clutch has the characteristics of long service life, power transmission is smooth and soft, and generally does not fail, it is widely used in various vehicles.

[0003] The wet clutch needs oil to cool and lubricate during torque transmission. Insufficient lubrication will cause the surface temperature of the clutch to rise rapidly and reduce its service life. If the lubrication flow rate is always kept high, not only will the cooling electronic pump continue to work, increasing power consumption, but also the clutch torque will be large, increasing the control difficulty of the clutch and possibly affecting the shift action of the shift fork.

[0004] In the prior art, the wet clutch transmission generally uses an electronic pump to provide cooling and lubrication flow. The electronic pump needs a certain response time from stopping to reaching the target speed, and the oil in the lubrication oil passage will also gradually leak after the engine stops. In order to ensure sufficient flow to the clutch, the lubrication oil passage needs to be filled before sliding to improve the response speed of the actual cooling and lubrication flow. On the other hand, when determining the required flow, the current engine operating state needs to be considered to avoid the cooling and lubrication electronic pump and the engine starting motor working at the same time, increasing the load of the power supply voltage. Therefore, if the cooling and lubrication flow cannot be provided according to the actual lubrication demand of the wet clutch, the cooling and lubrication control system consumes more power, and the working efficiency of the cooling and lubrication control system is low. SUMMARY

[0005] The purpose of the present application is to solve the problem that the prior art cannot provide cooling and lubrication flow according to the actual lubrication demand of the wet clutch, the cooling and lubrication control system consumes more power, and the working efficiency of the cooling and lubrication control system is low.

[0006] To solve the above problems, the embodiment of the present application discloses a cooling and lubrication control method of a clutch, comprising the following steps:

[0007] S1: determining whether the transmission controller is powered on; if yes, the cooling and lubrication of the clutch enters the pre-charging mode, the electronic pump is controlled to work, and the cooling and lubrication oil passage is lubricated with a pre-charging flow for pre-charging; and after the pre-charging time, step S2 is entered.

[0008] S2: obtaining engine operating state information and determining whether the engine has completed starting; if the engine has not completed starting, the electronic pump is controlled to work or not to work; if the engine has completed starting, step S3 is entered.

[0009] S3: The cooling lubrication of the clutch enters an engine start-up mode, the electronic pump is controlled to work, and the cooling lubrication oil passage is lubricated with make-up flow to supplement lubricating oil; and after the make-up time, step S4 is entered.

[0010] S4: Clutch torque transmission information is obtained, and it is determined whether the clutch transmits torque; if the clutch does not transmit torque, the cooling lubrication of the clutch enters an idle mode, and step S5 is entered; if the clutch transmits torque, step S6 is entered.

[0011] S5: Engine working state information is obtained, and it is determined whether the engine is in operation; if it is determined that the engine is stopped, the cooling lubrication of the clutch enters an engine stop mode, and returns to step S2; if it is determined that the engine continues to operate, step S7 is entered.

[0012] S6: The cooling lubrication of the clutch enters a sliding mode, the electronic pump is controlled to work, and the cooling lubrication oil passage is lubricated with make-up flow to supplement lubricating oil, so that the clutch reaches the heat balance requirement, and step S7 is entered.

[0013] S7: Clutch fork working state information is obtained, and it is determined whether the fork is in action; if the fork is not in action, step S4 is returned to; if the fork is in action, step S8 is entered.

[0014] S8: The cooling lubrication of the clutch enters a fork mode, the electronic pump is controlled to work, and the cooling lubrication oil passage is lubricated with minimum lubricating flow to supplement lubricating oil, and it is determined in real time whether the fork stops action; if the fork stops action, step S4 is returned to.

[0015] According to the above scheme, according to whether the gearbox controller is powered on, engine working state information, clutch working state information and fork working state information, multiple control modes are divided, and the operating state of the electronic pump is controlled according to different control modes. According to different control modes, the operating state of the electronic pump is controlled, the cooling lubrication oil passage can be supplemented with lubricating oil in time according to the heat dissipation requirement of the clutch, the heat balance of the clutch can be ensured, the problem of overheating of the clutch is avoided, and the clutch can work safely.

[0016] According to another specific embodiment of the present application, the cooling and lubrication control method of the clutch disclosed by the embodiments of the present application, in step S8, the current oil temperature of the lubricating oil in the clutch is obtained, and the minimum lubricating flow is obtained according to the current oil temperature, wherein when the current oil temperature is less than the lower oil temperature threshold, the minimum lubricating flow is 0 L / min; when the current oil temperature is greater than or equal to the lower oil temperature threshold and less than the upper oil temperature threshold, the minimum lubricating flow is 50% of the pre-charge flow; when the current oil temperature is greater than or equal to the upper oil temperature threshold, it is determined whether the pre-charge flow is greater than the required flow; if yes, the minimum lubricating flow is equal to the pre-charge flow; if no, the minimum lubricating flow is equal to the required flow.

[0017] By using the above scheme, when the lubricating oil of the cooling and lubricating oil passage meets the heat dissipation requirement of the clutch in the fork mode, the lubricating oil of the cooling and lubricating oil passage can be reduced according to the requirement, which can avoid the difficulty in dismounting the fork caused by torque, and can avoid the NVH (Noise, Vibration, Harshness) problem such as noise, so that the clutch can work safely.

[0018] According to another specific embodiment of the present application, the cooling and lubrication control method of the clutch disclosed by the embodiments of the present application, the lower oil temperature threshold is -20℃, and the upper oil temperature threshold is 20℃.

[0019] According to another specific embodiment of the present application, the cooling and lubrication control method of the clutch disclosed by the embodiments of the present application, in step S2, if the engine has not completed starting, it is determined whether the engine is starting according to the engine operating state information; if the engine is starting, the electronic pump is controlled to be inoperative, and it is continued to be determined whether the engine has completed starting; if the engine is not starting, the cooling and lubrication of the clutch enters the idle mode, and the gear position information and the vehicle speed information of the vehicle are obtained, and it is determined whether the vehicle working condition is the trailer working condition according to the gear position information and the vehicle speed information; if the vehicle working condition is the trailer working condition, the cooling and lubrication of the clutch enters the trailer mode, and the electronic pump is controlled to work, and the cooling and lubricating oil passage is lubricated with the trailer flow to supplement the minimum lubricating requirement of the clutch; if the vehicle working condition is not the trailer working condition, the cooling and lubrication of the clutch remains in the idle mode, and the electronic pump is controlled to be inoperative; wherein when the gear position information indicates that the vehicle is in neutral, and the vehicle speed information indicates that the current vehicle speed of the vehicle is greater than a set vehicle speed threshold, the trailer working condition is determined.

[0020] By using the above scheme, since there is a speed difference between the driving friction plate and the driven friction plate of the clutch of the vehicle during the trailer process, the clutch also generates heat. Therefore, the clutch is supplemented with the minimum lubricating flow, which can not only increase the power consumption of the electronic pump due to excessive lubricating oil supplement, but also ensure the effective heat dissipation of the clutch.

[0021] According to another specific embodiment of the present application, the cooling and lubricating control method of the clutch disclosed by the embodiments of the present application sets the vehicle speed threshold value as 5-10 km / h and the trailer flow as 0.5-1 L / min.

[0022] By using the above scheme, the lubrication requirement of the clutch in the trailer working condition can be effectively ensured.

[0023] According to another specific embodiment of the present application, the cooling and lubricating control method of the clutch disclosed by the embodiments of the present application sets the pre-charge time as 3-4 s and the pre-charge flow as 1-3 L / min in step S1.

[0024] According to another specific embodiment of the present application, the cooling and lubricating control method of the clutch disclosed by the embodiments of the present application sets the supplement time as 2.21-5.14 s and the supplement flow as 1-4 L / min in step S3.

[0025] According to another specific embodiment of the present application, the cooling and lubricating control method of the clutch disclosed by the embodiments of the present application acquires the current sliding friction power and the current oil temperature of the clutch in step S6, and determines the required flow by using the pre-stored sliding friction power, oil temperature and flow relationship of the clutch.

[0026] By using the above scheme, the most suitable lubricating oil required flow under the current condition can be determined by using the pre-stored sliding friction power, oil temperature and flow relationship of the clutch, so that the supplemented lubricating oil is neither too much nor too little, and the safety problem of the clutch due to improper lubricating oil supplement amount can be avoided.

[0027] According to another specific embodiment of the present application, the cooling and lubricating control method of the clutch disclosed by the embodiments of the present application further includes, if the engine stops running, when the engine cooling circulation loop and the clutch lubricating oil cooling loop are independent of each other, controlling the electronic pump to work, and when the engine cooling circulation loop and the clutch lubricating oil cooling loop are connected in series, controlling the electronic pump to not work.

[0028] By using the above scheme, whether the engine cooling circulation loop and the clutch lubricating oil cooling loop are connected in series or independent of each other is determined, so that the working condition of the electronic pump is determined, the effective heat dissipation of the clutch lubricating oil can be ensured, and the influence caused by the excessively high oil temperature can be avoided.

[0029] According to another specific embodiment of the present application, the cooling and lubricating control system of the clutch of a vehicle disclosed by the embodiments of the present application comprises:

[0030] The electronic pump.

[0031] The information acquisition unit is connected to the transmission controller, engine, clutch, and shift fork. It is used to collect vehicle status information, including whether the transmission controller is powered on, the engine's operating status, the clutch's operating status, and the shift fork's operating status.

[0032] The control unit is connected to the electronic pump and the information acquisition unit; the information acquisition unit sends the collected vehicle status information to the control unit, and the control unit controls the electronic pump to operate according to any of the clutch cooling and lubrication control methods described in the above embodiments based on the received vehicle status information.

[0033] By adopting the above scheme, the control unit can control the operation of the electronic pump in a timely manner based on the working status of the gearbox controller, engine, clutch, and shift fork collected by the information acquisition unit, so as to make the cooling and lubrication control of the clutch more timely and reasonable, and ensure the safe operation of the clutch.

[0034] The beneficial effects of this invention are:

[0035] Based on the power status of the transmission controller, engine operating status, clutch operating status, and shift fork operating status, multiple control modes are implemented, and the operation of the electric pump is controlled according to different control modes. Controlling the electric pump's operation according to different modes allows for timely replenishment of lubricating oil in the cooling lubrication channels according to the clutch's heat dissipation needs, ensuring the clutch reaches thermal balance, preventing overheating, and ensuring safe clutch operation. It also minimizes the power consumption of the electric pump. Attached Figure Description

[0036] Figure 1 This is a schematic flowchart of the clutch cooling and lubrication control method provided in Embodiment 1 of the present invention;

[0037] Figure 2 This is a schematic diagram of the switching operation of various control modes in the clutch cooling and lubrication control method provided in Embodiment 1 of the present invention;

[0038] Figure 3 This is a block diagram of the clutch cooling and lubrication control system provided in Embodiment 2 of the present invention.

[0039] Reference numerals:

[0040] 1: Information acquisition unit; 2: Control unit; 3: Electronic pump. Detailed Implementation

[0041] The advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the specification. Although the description of the present application will be introduced in combination with the preferred embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0042] It should be noted that in the specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] The terms "first", "second", and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the embodiments, it should also be noted that unless otherwise explicitly specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments can be understood according to the specific circumstances.

[0045] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0046] In order to solve the problems in the prior art that the cooling and lubrication flow cannot be provided according to the actual lubrication demand of the wet clutch, the cooling and lubrication control system consumes relatively large power, and the working efficiency of the cooling and lubrication control system is low. Next, the cooling and lubrication control method and system of the clutch provided by the embodiments of the present application will be described. Figures 1-3 The cooling and lubrication control method and system of the clutch provided by the embodiments of the present application will be described.

[0047] Embodiment 1

[0048] Referring to Figure 1 The embodiments of the present application disclose a cooling and lubrication control method of a clutch, comprising the steps of:

[0049] S1: Determine whether the gearbox controller is powered on; if yes, the cooling and lubrication of the clutch enters a pre-lubrication mode (PreLube), and the electronic pump is controlled to work to lubricate the cooling and lubrication oil passage with a pre-lubrication flow rate for pre-lubrication, and after a pre-lubrication time, step S2 is entered.

[0050] S2: Obtain engine operating state information and determine whether the engine has completed starting; if the engine has not completed starting, the cooling and lubrication of the clutch enters an engine starting mode (EngineStrat), and the electronic pump is controlled to work or not to work; if the engine has completed starting, step S3 is entered.

[0051] S3: The cooling and lubrication of the clutch enters an engine starting after mode (AfterCrank), and the electronic pump is controlled to work to lubricate the cooling and lubrication oil passage with a make-up flow rate for make-up, and after a make-up time, step S4 is entered.

[0052] S4: Obtain clutch torque transmission information and determine whether the clutch is transmitting torque; if the clutch is not transmitting torque, the cooling and lubrication of the clutch enters an idle mode (Idle), and step S5 is entered; if the clutch is transmitting torque, step S6 is entered.

[0053] It should be noted that the clutch in the present application is a wet clutch.

[0054] Specifically, in the idle mode, the clutch does not transmit torque, and at this time, since the oil in the cooling and lubrication oil passage will leak, the leakage flow rate of the oil passage can be supplemented according to the lubrication needs of the clutch.

[0055] As shown in Table 1, the correspondence between the oil temperature in the clutch oil cavity, the electronic pump flow rate and the electronic pump working time of the electronic pump in the idle mode is obtained through experiments. According to the record in Table 1, after obtaining the current oil temperature in the clutch oil cavity in the idle mode, the electronic pump flow rate and the electronic pump working time in the idle mode can be obtained.

[0056] Oil temperature / °C Electronic pump flow / L / min Electronic pump operating time / s -30 0.5 Until clutch transmits torque -20 0.5 Until clutch transmits torque 0 0.5 Until clutch transmits torque 20 1 Until clutch transmits torque 50 1 Until clutch transmits torque 70 1 Until clutch transmits torque 90 1 Until clutch transmits torque 120 1 Until clutch transmits torque

[0057] Table 1

[0058] S5: Obtain engine operating state information and determine the operating state of the engine; if it is determined that the engine stops running, the cooling and lubrication of the clutch enters an engine shutdown mode (AfterRun), and returns to step S2; if it is determined that the engine continues to run, step S7 is entered.

[0059] Specifically, when the engine stops running and enters the engine shutdown mode, whether the electronic pump works needs to be determined according to the relationship between the engine cooling circulation loop and the cooling loop of the clutch lubricating oil.

[0060] S6: The cooling lubrication of the clutch enters a sliding mode (Cooling Map), the electronic pump is controlled to work, the cooling lubrication oil channel is lubricated with a demand flow to supplement lubricating oil, and the clutch enters step S7 after reaching a thermal balance requirement.

[0061] S7: Working state information of a clutch fork is acquired, and it is determined whether the fork is in action; if the fork is not in action, it returns to step S4; if the fork is in action, it enters step S8.

[0062] S8: The cooling lubrication of the clutch enters a fork mode (Fork Progress), the electronic pump is controlled to work, the cooling lubrication oil channel is lubricated with a minimum lubrication flow to supplement lubricating oil, and it is determined in real time whether the fork is in action; if the fork is in action, it returns to step S4.

[0063] Next, reference is made to Figure 2 for the switching process of each control mode of the vehicle in the whole running state. Specifically, Figure 2 for the change of the working state of the components in the vehicle system in each control mode. For example, when the cooling lubrication of the clutch enters the sliding mode, the clutch generates sliding power, at this time, as the sliding power of the clutch increases, the cooling lubrication flow demand of the electronic pump also increases accordingly. Or, in the fork mode, at this time, the fork works, in order to make the lubrication flow generate smaller resistance to the fork, at this time, the cooling lubrication flow demand needs to be reduced according to the oil temperature.

[0064] It should be noted that in the cooling lubrication control method of the clutch provided in the embodiment, whether the electronic pump works is determined according to the estimated actual flow fed back, in this process, the actual speed of the electronic pump, the theoretical flow and the volumetric efficiency of the electronic pump need to be acquired. Among them, the actual speed of the electronic pump is acquired by a sensor, the volumetric efficiency of the electronic pump is tested by a fixed oil circuit load at different oil temperatures in the clutch oil chamber, and finally the estimated actual flow is obtained according to formula (1).

[0065] Estimated actual flow = speed * theoretical flow * volumetric efficiency of electronic pump (1)

[0066] Further, in step S8 of the cooling lubrication control method of the clutch provided in the embodiment, the current oil temperature of the lubricating oil in the clutch is acquired, and the minimum lubrication flow is obtained according to the current oil temperature, wherein when the current oil temperature is less than the lower oil temperature threshold, the minimum lubrication flow is 0 L / min; when the current oil temperature is greater than or equal to the lower oil temperature threshold and less than the upper oil temperature threshold, the minimum lubrication flow is 50% of the pre-charge flow; when the current oil temperature is greater than or equal to the upper oil temperature threshold, it is determined whether the pre-charge flow is greater than the demand flow; if yes, the minimum lubrication flow is equal to the pre-charge flow; if no, the minimum lubrication flow is equal to the demand flow.

[0067] Further, the cooling and lubrication control method of the clutch provided by the embodiment further has the following characteristics: the lower limit threshold of the oil temperature is -20°C; and the upper limit threshold of the oil temperature is 20°C.

[0068] Specifically, when the cooling and lubrication of the clutch is in the shift fork mode, a smaller lubrication flow rate is required to ensure heat dissipation of the clutch, so as to avoid difficulty in shift fork unmounting caused by torque and NVH (Noise, Vibration, Harshness) problems such as clutch noise.

[0069] It should be noted that in the embodiment, the amount of reduction of the lubrication flow rate is related to the current oil temperature in the clutch oil cavity. When the current oil temperature is higher, the torque is smaller, the influence of the lubrication flow rate on the shift fork resistance is smaller, and thus the amount of reduction of the lubrication flow rate is smaller. When the current oil temperature is lower, the torque is larger, the influence of the lubrication flow rate on the shift fork resistance is larger, and thus the amount of reduction of the lubrication flow rate is larger. In particular, when the oil temperature exceeds 20°C, the viscosity of the lubricating oil is reduced, the shift fork unmounting resistance caused by the lubrication flow rate is not large, and thus the minimum lubrication flow rate is determined by considering the demand flow rate of the clutch in the slipping mode and the pre-charge flow rate. In the embodiment, the temperature range in which the lubrication flow rate is reduced is determined according to the viscosity characteristics of the lubricating oil in the clutch oil cavity, and the percentage of reduction of the lubrication flow rate in the corresponding temperature range is obtained from the shift fork unmounting test.

[0070] Further, the cooling and lubrication control method of the clutch provided by the embodiment further has the following characteristics: in step S2, if the engine has not completed starting, it is determined whether the engine is starting according to the engine operating state information; if the engine is starting, the electronic pump is controlled to be inoperative, and it is continuously determined whether the engine has completed starting; if the engine is not starting, the cooling and lubrication of the clutch enters the idle-off mode (EOPOff), vehicle gear information and vehicle speed information are obtained, it is determined whether the vehicle operating condition is the trailer operating condition according to the vehicle gear information and the vehicle speed information; if the vehicle operating condition is the trailer operating condition, the cooling and lubrication of the clutch enters the trailer mode (Trailer), the electronic pump is controlled to be operative, and the cooling and lubrication oil passage is lubricated with the trailer flow rate to ensure the minimum lubrication demand of the clutch; if the vehicle operating condition is not the trailer operating condition, the cooling and lubrication of the clutch remains in the idle-off mode, and the electronic pump is controlled to be inoperative; wherein when the vehicle gear information indicates that the vehicle is in neutral and the vehicle speed information indicates that the current vehicle speed of the vehicle is greater than a set vehicle speed threshold, the vehicle operating condition is determined to be the trailer operating condition.

[0071] Further, the cooling and lubrication control method of the clutch provided by the embodiment further has the following characteristics: the set vehicle speed threshold is 5-10 km / h, and the trailer flow rate is 0.5-1 L / min.

[0072] The setting of the vehicle speed threshold takes into account the accuracy of the axle speed signal, avoiding misjudgment of the working condition of the vehicle at this time, and on the other hand, since the trailer working condition is the movement of the vehicle under the dragging of another vehicle, the maximum allowed trailer speed can be calculated according to the maximum uniform speed difference of the input and output shafts of the gearbox.

[0073] Further, although the clutch does not participate in work in the trailer working condition, there is a speed difference between the driving and driven friction plates of the clutch due to the movement of the vehicle. At this time, the electronic pump needs to provide the clutch with a minimum lubrication flow to meet the lubrication requirements of the clutch in the trailer working condition, and the specific value needs to be determined according to the hardware characteristics of the clutch.

[0074] It should be noted that when the vehicle is not in the trailer working condition, there is no speed difference between the driving and driven friction plates of the clutch, and the clutch has no lubrication requirement at this time, so the electronic pump does not need to work. However, in order to shorten the time for supplementing the lubricating oil to the required flow after the vehicle starts, the electronic pump can also be set to intermittent operation mode when the vehicle is not in the trailer working condition, so that the electronic pump supplements a certain amount of lubricating oil to the clutch lubricating oil passage at certain time intervals, which facilitates faster supplement of the required lubricating flow of the clutch after the vehicle starts.

[0075] Further, the cooling and lubrication control method of the clutch provided by the embodiment has the following characteristics: in step S1, the pre-charge time is 3-4s, and the pre-charge flow is 1-3L / min.

[0076] Specifically, the pre-charge time and the pre-charge flow are obtained by the following method:

[0077] First, in the oil temperature interval of-40-140℃, the output flow of the electronic pump is controlled under the premise of emptying the cooling and lubricating oil passage, and the response time of the cooling and lubrication control system is tested. The corresponding electronic pump flow at different oil temperatures is shown in Table 2:

[0078] Oil temperature / °C -30 -20 0 20 Electronic pump flow / L / min 1 2 3 3

[0079] Table 2

[0080] Through experiments, the corresponding relationship between the oil temperature and the pre-charge time and the pre-charge flow in the pre-charge mode is shown in Table 3. According to the information recorded in Table 3, after obtaining the current oil temperature in the clutch oil chamber in the pre-charge mode, the pre-charge flow and the pre-charge time in the pre-charge mode can be obtained.

[0081] Oil temperature / °C Pre-charge flow / L / min Measured system response time / s Pre-charge time / s -30 1 3.23 4 -20 2 2.385 3 0 3 1.595 3 20 3 1.35 3 50 3 2.47 3 70 3 3.02 3 90 3 2.57 3 120 3 2.75 3

[0082] Table 3

[0083] Further, the clutch cooling and lubrication control method provided by the embodiment further comprises: in step S3, the replenishment time is 2.21-5.14s, and the replenishment flow rate is 1-4L / min.

[0084] Specifically, through experiments, the correspondence between the oil temperature in the engine start-up mode and the replenishment time and the replenishment flow rate is shown in Table 4. According to the information recorded in Table 4, after obtaining the current oil temperature in the clutch oil cavity in the engine start-up mode, the replenishment flow rate and the replenishment time in the engine start-up mode can be obtained.

[0085] Oil temperature / °C Maximum leak rate / L / min Start-up time / s Make-up flow / L / min Make-up time / s -30 0.84 6 1 5.14 -20 0.91 4 2 3.29 0 2.53 1 4 2.58 20 2.64 1 4 2.21 50 2.12 1 4 2.98 70 2.32 1 4 4.22 90 3 1 4 3.17 120 3 1 4 3.26

[0086] Table 4

[0087] Further, the clutch cooling and lubrication control method provided by the embodiment further comprises: in step S6, obtaining the current slip power and the current oil temperature of the clutch, and determining the required flow rate by using the pre-stored slip power, oil temperature and flow rate relationship of the clutch.

[0088] Specifically, the pre-stored slip power, oil temperature and flow rate relationship of the clutch is obtained by the following method:

[0089] First, before the production of the clutch, the demand flow rate of the lubricating oil under different slip powers and different oil temperatures of the clutch is determined according to the simulation results of the computational fluid dynamics (CFD) simulation by establishing a clutch friction model. According to the different hardware characteristics of each clutch, the corresponding demand flow rate under the same slip power and the same oil temperature will also be different.

[0090] Then, during the production of the clutch, the demand flow rate data of the lubricating oil under different slip powers and different oil temperatures of the clutch obtained in the simulation stage are used as the default parameters of the clutch. Only by obtaining the current slip power and the current oil temperature of the clutch, the demand flow rate of the current lubricating oil can be obtained according to the default value.

[0091] Further, the clutch cooling and lubrication control method provided by the embodiment further comprises: in step S5, if the engine stops running, then: when the engine cooling circulation loop and the clutch lubricating oil cooling loop are independent of each other, the electronic pump is controlled to work; and when the engine cooling circulation loop and the clutch lubricating oil cooling loop are connected in series, the electronic pump is controlled to not work.

[0092] Specifically, if the engine cooling circulation loop and the clutch lubricating oil cooling loop are independent of each other, the clutch lubricating oil has a separate cooling path at this time, and after the engine stops running, the electronic pump can continue to work to cool the clutch friction plate without causing the oil temperature to rise. If the engine cooling circulation loop and the clutch lubricating oil cooling loop are connected in series, after the engine stops running, the clutch lubricating oil loses the cooling source, and at this time, if the electronic pump continues to work, the heat generated by the electronic pump cannot be dissipated in time, which will cause the oil temperature of the lubricating oil to rise, so the electronic pump stops working at this time.

[0093] In summary, according to whether the gearbox controller is powered on, the engine operating state information, the clutch operating state information and the yoke operating state information, multiple control modes are divided, and the operating state of the electronic pump is controlled according to different control modes. According to different control modes, the operating state of the electronic pump is controlled, which can supplement the lubricating oil of the cooling lubricating oil circuit in time according to the heat dissipation needs of the clutch, ensure that the clutch can reach thermal equilibrium, avoid the problem of overheating of the clutch, and enable the clutch to work safely.

[0094] Embodiment 2

[0095] Based on the clutch cooling lubrication control method, the embodiment of the present application also provides a clutch cooling lubrication control system. The clutch cooling lubrication control system provided by the embodiment is used to execute the clutch cooling lubrication control method provided by the above embodiment 1.

[0096] Specifically, referring to Figure 3 , the clutch cooling lubrication control system provided by the embodiment includes an electronic pump 1, an information acquisition unit 2 and a control unit 3.

[0097] The information acquisition unit 2 can be composed of a gearbox controller sensor, an engine sensor, a clutch sensor and a yoke sensor, and each sensor can detect whether the gearbox controller is powered on, the engine operating state information, the clutch operating state information and the yoke operating state information. Of course, the information acquisition unit 2 also includes a communication device capable of sending information to ensure that the information acquisition unit 2 can quickly send the collected information to the control unit 3.

[0098] The control unit 3 can be a vehicle controller, or a control unit that can specially receive the information collected by the information acquisition unit 2 and control the operation of the electronic pump according to the received information. Those skilled in the art can set it according to the actual situation.

[0099] While the application has been illustrated and described in connection with certain preferred embodiments thereof, it will be readily apparent to those of ordinary skill in the art that various changes in form and detail can be made therein without departing from the spirit and scope of the application. It is intended to encompass all such changes and alterations in the details thereof.

Claims

1. A cooling and lubrication control method for a clutch, characterized by, The method comprises the following steps: S1: determining whether the gearbox controller is powered on; If yes, the cooling lubrication of the clutch enters a pre-charging mode, the electronic pump is controlled to work, and the cooling lubrication oil channel is pre-charged with a pre-charging flow rate; and after a pre-charging time, the step S2 is entered; S2: obtaining engine working state information and determining whether the engine has completed starting; If the engine has not completed starting, the electronic pump is controlled to work or not to work; If the engine has completed starting, the step S3 is entered; S3: the cooling lubrication of the clutch enters an engine starting mode, the electronic pump is controlled to work, and the cooling lubrication oil channel is supplemented with a supplement flow rate; and after a supplement time, the step S4 is entered; S4: obtaining clutch torque transmission information and determining whether the clutch transmits torque; If the clutch does not transmit torque, the cooling lubrication of the clutch enters an idle mode, and the step S5 is entered; If the clutch transmits torque, the step S6 is entered; S5: obtaining the engine working state information and determining the working state of the engine; If it is determined that the engine stops running, the cooling lubrication of the clutch enters an engine stop mode, and the step S2 is returned to; If it is determined that the engine continues to run, the step S7 is entered; S6: the cooling lubrication of the clutch enters a sliding mode, the electronic pump is controlled to work, and the cooling lubrication oil channel is supplemented with a required flow rate, so that the clutch reaches a heat balance requirement, and then the step S7 is entered; S7: obtaining the working state information of the clutch fork and determining whether the fork is in action; If the fork is not in action, the step S4 is returned to; If the fork is in action, the step S8 is entered; S8: the cooling lubrication of the clutch enters a fork mode, the electronic pump is controlled to work, the cooling lubrication oil channel is supplemented with a minimum lubrication flow rate, and it is determined in real time whether the fork stops in action; If the fork stops in action, the step S4 is returned to; In the step S8, the current oil temperature of the lubricating oil in the clutch is obtained, and the minimum lubrication flow rate is obtained according to the current oil temperature, wherein, when the current oil temperature is less than a lower oil temperature threshold, the minimum lubrication flow rate is 0 L / min; when the current oil temperature is greater than or equal to the lower oil temperature threshold and less than an upper oil temperature threshold, the minimum lubrication flow rate is 50% of the pre-charging flow rate; when the current oil temperature is greater than or equal to the upper oil temperature threshold, it is determined whether the pre-charging flow rate is greater than the required flow rate; If yes, the minimum lubrication flow rate is equal to the pre-charging flow rate; If no, the minimum lubrication flow rate is equal to the required flow rate.

2. The cooling lubrication control method of the clutch according to claim 1, wherein the lower oil temperature threshold is -20℃, and the upper oil temperature threshold is 20℃.

3. The cooling and lubricating control method of a clutch according to claim 1, characterized by, In the step S2, if the engine has not completed starting, it is determined according to the engine working state information whether the engine is starting; If the engine is starting, the electronic pump is controlled not to work, and it is continuously determined whether the engine has completed starting; If the engine is not started, the cooling and lubrication of the clutch enters a stop mode, and vehicle gear information and vehicle speed information are acquired, and whether the vehicle working condition is a trailer working condition is determined according to the vehicle gear information and the vehicle speed information; If the vehicle working condition is the trailer working condition, the cooling and lubrication of the clutch enters a trailer mode, the electronic pump is controlled to work, and the cooling and lubrication oil channel is supplemented with trailer flow to ensure the minimum lubrication requirement of the clutch; If the vehicle working condition is not the trailer working condition, the cooling and lubrication of the clutch remains in the stop mode, and the electronic pump is controlled not to work. When the vehicle gear information indicates that the vehicle is in neutral, and the vehicle speed information indicates that the current vehicle speed is greater than a set vehicle speed threshold, the trailer working condition is determined.

4. The cooling and lubricating control method of a clutch according to claim 3, characterized by, The set vehicle speed threshold is 5-10 km / h, and the trailer flow is 0.5-1 L / min.

5. The cooling and lubricating control method of a clutch according to any one of claims 1 to 4, characterized in that, In the step S1, the pre-charge time is 3-4 s, and the pre-charge flow is 1-3 L / min.

6. The cooling and lubricating control method of a clutch according to any one of claims 1 to 4, characterized in that, In the step S3, the supplement time is 2.21-5.14 s, and the supplement flow is 1-4 L / min.

7. The cooling and lubricating control method of a clutch according to any one of claims 1 to 4, characterized in that, In the step S6, the current slip power and the current oil temperature of the clutch are acquired, and the required flow is determined through a pre-stored slip power, oil temperature and flow relationship of the clutch.

8. The cooling and lubricating control method of a clutch according to any one of claims 1 to 4, characterized in that, The step S5 further includes, if the engine stops running: When the cooling circulation loop of the engine and the cooling loop of the lubricating oil of the clutch are independent of each other, the electronic pump is controlled to work; When the cooling circulation loop of the engine and the cooling loop of the lubricating oil of the clutch are connected in series, the electronic pump is controlled not to work.

9. A clutch cooling and lubrication control system for a vehicle, characterized by, It comprises: An electronic pump; An information acquisition unit connected with a gearbox controller, an engine, a clutch and a shift fork, for acquiring vehicle state information, the vehicle state information including whether the gearbox controller is powered on, working state information of the engine, working state information of the clutch and working state information of the shift fork; A control unit connected with the electronic pump and the information acquisition unit; the information acquisition unit sends the acquired vehicle state information to the control unit, and the control unit controls the electronic pump to operate according to the received vehicle state information in the cooling and lubrication control method of the clutch according to any one of claims 1-8.

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