Control method of clutch oil filling and storage medium

Abstract

This invention provides a control method and storage medium for clutch oil filling. The clutch of this invention uses an electronic pump for oil filling. The control method includes: calculating the actual oil filling volume V2 based on the current actual clutch pressure P2 and the actual speed of the electronic pump, and calculating the target oil filling volume V1 based on the target torque, thereby calculating the oil filling completion coefficient Factor; when the oil filling completion coefficient does not reach a set ratio, calculating the set pressure P4 and the target duty cycle according to the target oil filling time requirement, to control the actual speed of the electronic pump, forming a closed-loop control for clutch oil filling. The clutch oil filling control method of this invention calculates the oil filling completion coefficient and the target duty cycle required by the electronic pump motor based on the actual pressure P2, target torque, and target oil filling time, to adjust and control the operation of the electronic pump, making the actual speed of the electronic pump more suitable for clutch oil leakage, thereby improving the clutch oil filling control effect.

Description

Technical Field

[0001] This invention relates to the field of clutch control technology, and in particular to a method for controlling clutch oil filling. Additionally, this invention also relates to a storage medium. Background Technology

[0002] The clutch plays a crucial role in controlling vehicle start-stop, gear shifting, and other operations. Current technology primarily uses hydraulic control to open and close the clutch, mainly controlling the clutch's oil supply via a hydraulic module. However, hydraulic modules are generally large, making them less suitable for systems with limited powertrain space or low hydraulic fluid levels.

[0003] Furthermore, regarding clutch oil filling control, different hardware systems exhibit varying levels of oil leakage during the filling process. However, compensation control for oil leakage often employs the same set of parameters, failing to cover hardware differences and leakage levels under varying pressure conditions. This can easily lead to poor shifting quality across the entire vehicle. Moreover, existing clutch oil filling control is an open-loop control system. The oil filling control parameters are not calculated and adjusted based on the actual pressure, oil temperature, and other conditions detected by sensors, which can easily result in insufficient or overfilling. Summary of the Invention

[0004] In view of this, the present invention aims to provide a clutch oil filling control method to improve the clutch oil filling control effect.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A method for controlling clutch oil filling, wherein the clutch employs an electronic pump for oil filling, the control method comprising:

[0007] The actual oil filling volume V2 is calculated based on the current actual clutch pressure P2 and the actual speed of the electronic pump, and the target oil filling volume V1 is calculated based on the target torque, and then the oil filling completion coefficient Factor is calculated.

[0008] When the filling completion factor Factor does not reach the set ratio, the set pressure P4 and the target duty cycle are calculated according to the target filling time requirement to control the actual speed of the electronic pump, thus forming a closed-loop control for clutch filling.

[0009] Furthermore, the calculation of the actual oil filling volume V2 includes the following steps:

[0010] Establish the first curve for clutch pressure versus electric pump speed, and the first variable table for electric pump flow rate;

[0011] Obtain the actual clutch pressure P2, determine the set speed of the electronic pump based on the first curve, and then determine the clutch leakage flow using the set speed of the electronic pump and the first variable table; obtain the actual speed of the electronic pump, determine the output flow of the electronic pump F1 based on the first variable table, and calculate the actual input flow of the clutch F2: F2 = F1 - clutch leakage flow.

[0012] The actual filling volume V2 is obtained by integrating F2 over the filling time.

[0013] Furthermore, the following steps are used to determine the leakage flow rate of the clutch:

[0014] The leakage flow rate L1 is determined using the set speed of the electronic pump and the first variable table;

[0015] The maximum leakage flow rate A and the minimum leakage flow rate B are obtained through extreme sample testing. The actual leakage flow rate L2 is then obtained by correction: L2 = Max(B,Min(A,L1)). The clutch leakage flow rate adopts the actual leakage flow rate L2.

[0016] Furthermore, the first variable table is a variable table concerning the electric pump speed, clutch pressure, oil temperature, and electric pump flow rate.

[0017] Furthermore, the oil filling completion factor Factor is calculated using the following formula: Factor = (V2 / V1) × 100%.

[0018] Furthermore, the set ratio is 92% to 98%.

[0019] Furthermore, the calculation of the target oil filling volume V1 based on the target torque includes the following steps:

[0020] Establish a second curve relating to the target torque-target filling pressure curve, and a second variable table relating to the filling volume;

[0021] Obtain the target torque required by the clutch, determine the target filling pressure P1 based on the second curve, and determine the target filling volume V1 based on P1 and the second variable table.

[0022] Furthermore, the calculation of the set pressure P4 and the target duty cycle includes the following steps:

[0023] Calculate the target filling flow rate F3: F3 = V1 / target filling time;

[0024] Establish a third variable table regarding the target oil filling flow rate and the oil filling compensation pressure. Based on the target oil filling flow rate F3 and the third variable table, determine the oil filling compensation pressure P3, and then calculate the set pressure P4: P4 = P3 + P1; establish a third curve regarding the pressure-duty cycle, and determine the target duty cycle based on the set pressure P4 and the third curve.

[0025] Furthermore, the second variable table is a variable table concerning clutch pressure, clutch displacement, and filling volume, and / or the third variable table is a variable table concerning target filling flow rate, filling completion coefficient, oil temperature, and filling compensation pressure.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The clutch oil filling control method of the present invention uses an electronic pump to complete the oil filling of the clutch, which is suitable for the small clutch oil supply layout space requirements. The entire control method adopts closed-loop control. Based on the preset control curve and variable table, the oil filling completion coefficient Factor and the target duty cycle required by the electronic pump motor can be calculated according to the actual pressure P2, target torque and target oil filling time, so as to adjust the operation of the electronic pump and make the actual speed of the electronic pump more suitable for the clutch oil leakage situation, thereby improving the clutch oil filling control effect.

[0028] Furthermore, by establishing a first curve, the set speed of the electronic pump required to maintain the current pressure can be calculated based on the actual pressure P2. Then, using the set speed of the electronic pump and the established first variable table, the clutch leakage flow rate can be determined. By obtaining the current actual speed of the electronic pump and determining the current output flow rate F1 from the first variable table, the actual input flow rate F2 of the clutch and the actual oil filling volume V2 of the clutch can be calculated. Using the above calculation strategy, a relatively accurate actual oil filling volume V2 can be obtained, which is useful for subsequent calculation of the oil filling completion factor (Factor) and adjustment and control of the electronic pump target duty cycle.

[0029] Another object of the present invention is to provide a storage medium storing a computer program that, when executed by a processor, causes the processor to implement the clutch lubrication control method described in this invention. The storage medium of the present invention possesses the technical advantages of the aforementioned clutch lubrication control method. Attached Figure Description

[0030] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are for explaining the invention. The directional terms used, such as front / back, up / down, etc., are only used to indicate relative positional relationships and do not constitute an improper limitation of the invention. In the drawings:

[0031] Figure 1 This is a schematic diagram of the control flow of the clutch oil filling control method according to Embodiment 1 of the present invention. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] In the description of this invention, unless otherwise explicitly defined, the terms "installation," "connection," "linking," and "connector" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances. The limiting terms such as "first," "second," "A," "B," "C," and "D" appearing in the description of this invention are merely for distinguishing similar features in different locations, attributions, or uses, in order to avoid ambiguity and confusion, and should not be construed as indicating or implying relative importance.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Example 1

[0036] This embodiment relates to a clutch oil filling control method, which can improve the clutch oil filling control effect; an exemplary control flow is as follows: Figure 1 As shown.

[0037] Overall, this clutch uses an electronic pump for oil filling, and the control method for oil filling of the clutch includes:

[0038] The actual filling volume V2 is calculated based on the current actual clutch pressure P2 and the actual speed of the electronic pump, and the target filling volume V1 is calculated based on the target torque. Then, the filling completion coefficient Factor is calculated. When the filling completion coefficient Factor does not reach the set ratio, the set pressure P4 and the target duty cycle are calculated according to the target filling time requirement to control the actual speed of the electronic pump and form a closed-loop control for clutch filling.

[0039] Specifically, calculating the actual oil-filled volume V2 includes the following steps:

[0040] (1) Establish the first curve for clutch pressure-electro-pump speed and the first variable table for the flow rate of the electro-pump;

[0041] (2) Obtain the actual clutch pressure P2, determine the electronic pump set speed based on the first curve, and then use the electronic pump set speed and the first variable table to determine the clutch leakage flow rate.

[0042] (3) Obtain the actual speed of the electronic pump, determine the output flow rate F1 of the electronic pump based on the first variable table, and calculate the actual input flow rate F2 of the clutch: F2 = F1 - clutch leakage flow rate;

[0043] (4) Integrate F2 over the filling time to obtain the actual filling volume V2.

[0044] By establishing the first curve, the set speed of the electronic pump required to maintain the current pressure can be calculated based on the actual pressure P2. Then, using the set speed of the electronic pump and the established first variable table, the clutch leakage flow rate can be determined. By obtaining the current actual speed of the electronic pump and determining the current output flow rate F1 of the electronic pump using the first variable table, the actual input flow rate F2 of the clutch and the actual oil filling volume V2 of the clutch can be calculated. Using the above calculation strategy, a relatively accurate actual oil filling volume V2 can be obtained, which is useful for subsequent calculation of the oil filling completion factor (Factor) and adjustment and control of the target duty cycle of the electronic pump.

[0045] The aforementioned first variable table is pre-set, preferably including parameters related to the electric pump flow rate such as electric pump speed, clutch pressure, and oil temperature. By including the electric pump speed, clutch pressure, and oil temperature, which affect the change in the electric pump output flow rate F1, as variable factors in determining the electric pump output flow rate F1, the establishment of the first variable table facilitates the quick and accurate acquisition of the current electric pump output flow rate F1.

[0046] There are several ways to determine the clutch leakage flow rate. Preferably, the following steps are used:

[0047] (1) Determine the leakage flow rate L1 using the electronic pump set speed and the first variable table;

[0048] (2) The maximum leakage flow rate A and the minimum leakage flow rate B are obtained through limit sample testing, and the actual leakage flow rate L2 is obtained by correction: L2 = Max(B,Min(A,L1)). The clutch leakage flow rate adopts the actual leakage flow rate L2.

[0049] Verifying and correcting the clutch leakage flow under extreme conditions, and using the corrected actual leakage flow L2 as the clutch leakage flow, helps to improve the accuracy of the calculated actual clutch input flow F2.

[0050] Based on the above control steps, the oil filling completion factor (Factor) is calculated using the following formula:

[0051] Factor = (V2 / V1) × 100%.

[0052] Set the setting ratio between 92% and 98%. When the oil filling completion factor (Factor) reaches the set ratio, it means that the clutch oil filling is complete. When the oil filling completion factor (Factor) is less than the set ratio, it means that oil still needs to be added to the clutch to increase the clutch oil filling pressure and torque.

[0053] Using the lubrication completion factor (Factor) as a parameter to judge the completion of clutch lubrication allows for a quick determination of whether the clutch lubrication has met the required standards. Setting this factor between 92% and 98% can satisfy the clutch's operational needs and lubrication control requirements; for example, this setting can be 92%, 94%, 96%, 97%, 98%, etc.

[0054] The target oil-filling volume V1 involved in the above calculation is calculated based on the target torque. In this embodiment, the target oil-filling volume V1 is obtained using the following steps:

[0055] (1) Establish a second curve regarding the target torque-target filling pressure curve, and a second variable table regarding the filling volume;

[0056] (2) Obtain the target torque required by the clutch, determine the target filling pressure P1 based on the second curve, and determine the target filling volume V1 based on the second variable table using P1.

[0057] Therefore, the calculation of the set pressure P4 and the target duty cycle includes the following steps:

[0058] (1) Calculate the target oil filling flow rate F3: F3 = V1 / target oil filling time;

[0059] (2) Establish a third variable table for the target oil filling flow rate and the oil filling compensation pressure. Based on the target oil filling flow rate F3 and the third variable table, determine the oil filling compensation pressure P3, and then calculate the set pressure P4: P4 = P3 + P1;

[0060] (3) Establish a third curve for pressure-duty cycle, and determine the target duty cycle based on the set pressure P4 and the third curve.

[0061] By pre-establishing a second curve and a second variable table, the target torque required by the clutch can be obtained, and the target filling pressure P1 and target filling volume V1 can be predicted. With the help of the established third curve and third variable table, the most suitable target duty cycle can be calculated and determined to control the actual speed of the electronic pump, thereby achieving the purpose of improving the clutch filling control effect.

[0062] It should be noted that the second, third, and first variable tables mentioned above are all pre-set, as are the first, second, and third curves. The correspondence between the curves and the variables in the tables can be obtained by testing the clutch's oil filling process. By adaptively adjusting for leakage in different hardware and improving using a self-learning strategy, the actual system leakage of different hardware can be reflected. Simultaneously, the output flow of the electronic pump is fed back in real time by sensor signals such as the electronic pump speed, actual clutch pressure, and oil temperature to eliminate differences in volumetric efficiency between different electronic pumps. Finally, the optimal duty cycle input for the electronic pump is calculated based on the above logic. Introducing closed-loop control based on the oil filling volume difference improves the consistency of oil filling quality and effect, thereby improving shift quality.

[0063] In this embodiment, the second variable table is for clutch pressure, clutch displacement, and filling volume, and the third variable table is for target filling flow rate, filling completion coefficient, oil temperature, and filling compensation pressure. Similar to the first variable table, establishing a second variable table related to parameters such as clutch pressure, clutch displacement, and filling volume, and a third variable table related to parameters such as target filling flow rate, filling completion coefficient, oil temperature, and filling compensation pressure, allows for faster and more accurate acquisition of the required target filling volume V1 and filling compensation pressure P3, thereby further improving the clutch filling control effect.

[0064] In summary, the clutch oil filling control method of this embodiment uses an electronic pump to complete the clutch oil filling, which is suitable for the small clutch oil supply layout space requirements. The entire control method adopts closed-loop control. Based on the preset control curve and variable table, the oil filling completion coefficient Factor and the target duty cycle required by the electronic pump motor can be calculated according to the actual pressure P2, target torque and target oil filling time, so as to adjust the operation of the electronic pump and make the actual speed of the electronic pump more suitable for the clutch oil leakage situation, thereby improving the clutch oil filling control effect.

[0065] Example 2

[0066] This embodiment relates to a storage medium storing a computer program that, when executed by a processor, enables the processor to implement the clutch oil filling control method provided in Embodiment 1.

[0067] When the clutch is controlled using the clutch filling control method of Embodiment 1 on the vehicle, the actual system leakage of the clutch electronic pump can be calculated more accurately, thereby determining the actual filling flow rate required during the clutch electronic pump filling process. Under the filling control logic based on closed-loop control, the duty cycle control value that should be given to the electronic pump is indirectly calculated by using the electronic pump speed recorded during the pressure-duty cycle self-learning process, thereby improving the flow calculation model for different clutch hardware and improving the consistency of clutch filling quality.

[0068] The actual output flow of the electronic pump is controlled by real-time calculation based on actual pressure and actual electronic pump speed. While replenishing the clutch leakage, the target torque required for clutch output is controlled. The overall control strategy can be implemented through software and programs pre-stored in the storage medium. The overall closed-loop control strategy can improve the robustness of the software program. During the oil filling process, a closed-loop control based on volume difference is introduced, which improves the quality of clutch oil filling and enhances the overall driving experience.

[0069] Using an electronic pump to fill the clutch in a vehicle is more suitable for the space requirements of the powertrain and is also suitable for the application scenarios using the control method of Embodiment 1. In addition, electronic pumps have the advantages of high electrification, low development cost, and easier platformization. With the help of the control method of Embodiment 1, the control accuracy of the actual output flow of the electronic pump during the clutch filling process is significantly improved, which can well meet the clutch filling control requirements.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for controlling clutch oil filling, characterized in that, The clutch uses an electronic pump for oil filling, and the control method includes: Establish a first curve for clutch pressure versus electric pump speed, a second curve for target torque versus target filling pressure, and a first variable table for electric pump flow rate; Obtain the actual clutch pressure P2, determine the electronic pump set speed based on the first curve, and then determine the clutch leakage flow rate using the electronic pump set speed and the first variable table. Obtain the actual speed of the electronic pump, determine the output flow rate F1 of the electronic pump based on the first variable table, and calculate the actual input flow rate F2 of the clutch: F2 = F1 - clutch leakage flow rate; Obtain the target torque required by the clutch, determine the target filling pressure P1 based on the second curve; integrate F2 over the filling time to obtain the actual filling volume V2, and calculate the target filling volume V1 based on the target torque, and then calculate the filling completion coefficient Factor. When the filling completion factor Factor does not reach the set ratio, the target filling flow rate F3 is calculated according to the target filling time requirement: F3 = V1 / target filling time; a third variable table is established regarding the target filling flow rate and the filling compensation pressure. Based on the target filling flow rate F3 and the third variable table, the filling compensation pressure P3 is determined, and then the set pressure P4 is calculated: P4 = P3 + P1; a third curve regarding pressure-duty cycle is established. Based on the set pressure P4 and the third curve, the target duty cycle is determined to control the actual speed of the electronic pump, forming a closed-loop control for clutch filling. The oil filling completion factor Factor is calculated using the following formula: Factor = (V2 / V1) × 100%.

2. The clutch oil filling control method according to claim 1, characterized in that, The following steps are used to determine the leakage flow rate of the clutch: The leakage flow rate L1 is determined using the set speed of the electronic pump and the first variable table; The maximum leakage flow rate A and the minimum leakage flow rate B are obtained through extreme sample testing. The actual leakage flow rate L2 is then obtained by correction: L2=Max(B,Min(A,L1)). The clutch leakage flow rate adopts the actual leakage flow rate L2.

3. The clutch oil filling control method according to claim 1, characterized in that: The first variable table is a table of variables related to the electric pump speed, clutch pressure, oil temperature, and electric pump flow rate.

4. The clutch oil filling control method according to claim 1, characterized in that: The set ratio is 92% to 98%.

5. The clutch oil filling control method according to any one of claims 1 to 4, characterized in that, The calculation of the target oil filling volume V1 based on the target torque includes the following steps: Establish a second variable table for the oil filling volume, and determine the target oil filling volume V1 based on the second variable table by P1.

6. The clutch oil filling control method according to claim 5, characterized in that: The second variable table is a variable table concerning clutch pressure, clutch displacement, and filling volume, and / or the third variable table is a variable table concerning target filling flow rate, filling completion coefficient, oil temperature, and filling compensation pressure.

7. A storage medium, characterized in that: The storage medium stores a computer program, which, when executed by a processor, causes the processor to implement the clutch oil filling control method as described in any one of claims 1-6.

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