A replaceable filter screen solenoid valve and method of determining filter screen size

Abstract

This invention relates to a replaceable filter solenoid valve and a method for determining filter specifications. The solenoid valve body has several grooves, each groove containing an oil inlet and a control oil inlet. An elastic filter is embedded within each groove, covering both the control oil inlet and the oil inlet. The elastic filter has an opening. Because the elastic filter is elastic and has an opening, it can be inserted into or removed from the groove by expanding the opening, thus greatly improving the convenience of replacing the elastic filter.

Description

Technical Field

[0001] This invention relates to the technical field of automotive transmission hydraulic systems, specifically to a replaceable filter solenoid valve and a method for determining filter specifications. Background Technology

[0002] As a core component of the transmission system, the hydraulic system controls the engagement and disengagement of the clutch and brake through changes in oil pressure via solenoid valves, thereby transmitting power and shifting gears; simultaneously, it alters the path of the lubricating oil circuit to achieve lubrication. Hydraulic systems are highly sensitive to foreign matter in the oil passages, necessitating increasingly stringent requirements for the cleanliness of the transmission manufacturing process. While the manufacturing quality of transmission components has improved in recent years, reducing the number of large foreign objects, small foreign objects remain relatively common. Mixtures of these small foreign objects can cause solenoid valve sticking, leading to transmission damage and impacting the user's driving experience. As in the prior art, a solenoid valve is proposed, comprising a solenoid valve body, a coil placed on the upper part of the solenoid valve body, a magnetic shielding tube placed in the inner hole of the coil, a moving iron core, a valve stem, a spring, a stationary iron core, a sealing ring placed between the lower open end face of the magnetic shielding tube and the stationary iron core, a main valve seat ball placed in the inner hole of the lower end of the valve stem, a main valve seat placed in the inner hole of the solenoid valve, an oil inlet filter screen placed at the bottom of the solenoid valve, a solenoid valve oil outlet hole placed in the horizontal middle part of the solenoid valve body and penetrating the inner cavity of the solenoid valve body, and an annular oil outlet filter screen placed outside the oil outlet hole of the solenoid valve. The solenoid valve body is characterized by a ring-shaped groove at its lower part; a U-shaped one-way sealing ring is provided on the groove; the U-shaped one-way sealing ring opens downwards.

[0003] However, although the existing solenoid valves have filters for filtering foreign objects, these filters are difficult to replace. After a period of use, dirt will accumulate on the filters, affecting their ability to pass hydraulic oil and consequently impacting the operation of the entire hydraulic system. Summary of the Invention

[0004] One objective of this invention is to provide a solenoid valve with a replaceable filter screen to solve the problem that the filter screen on the solenoid valve in the prior art is not easy to replace; another objective is to provide a method for determining the filter screen specifications.

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

[0006] A replaceable filter solenoid valve includes a solenoid valve body with a plurality of grooves, wherein an oil inlet and a control oil inlet are provided in the grooves; an elastic filter is embedded in the grooves, the elastic filter covering the control oil inlet and the oil inlet; and the elastic filter has an opening.

[0007] Based on the above-mentioned technical means, since the elastic filter is elastic and has an opening, the elastic filter can be inserted into the groove or removed from the groove by expanding the opening, thereby greatly improving the convenience of replacing the elastic filter.

[0008] Furthermore, the elastic filter screen has a protrusion near the opening.

[0009] Based on the aforementioned technical means, the protrusions facilitate hand gripping to enlarge the opening of the elastic filter.

[0010] Furthermore, the groove includes a first groove and a second groove, the oil inlet is located in the first groove, and the control oil inlet is located in the second groove; the elastic filter screen is provided in both the first groove and the second groove.

[0011] Based on the above technical means, the control oil port and the oil inlet are located in different grooves, and the elastic filter screen in the first groove or the second groove can be replaced separately according to the actual situation.

[0012] A method for determining the specifications of the aforementioned elastic filter screen includes the following steps:

[0013] S1. Statistical analysis of the transmission failure rate of vehicles equipped with solenoid valves featuring elastic filters with a mesh size of A1;

[0014] S11. If the failure rate is less than or equal to B, then A1 is the appropriate specification for the flexible filter screen;

[0015] S12. If the failure rate is greater than B, then conduct NVH (Noise, Vibration, Harshness) evaluation and shift shock evaluation on vehicles with solenoid valves having elastic filters with mesh size A1, and record the results of the NVH evaluation and shift shock evaluation.

[0016] S2. Replace the elastic filter screen of the solenoid valve in the vehicle's transmission hydraulic system with A2;

[0017] S3. Conduct NVH evaluation, shift shock evaluation, and urban road adaptability test on vehicles with solenoid valves having an elastic filter with a mesh size of A2.

[0018] S31. If the results of the NVH evaluation, shift shock evaluation and urban road adaptability test are qualified, vehicles with solenoid valves having an elastic filter screen with a mesh size of A2 will be put on the market.

[0019] S32. If the results of the NVH evaluation, shift shock evaluation and urban road adaptability test are unqualified, the elastic filter with a larger mesh size needs to be replaced and S2-S3 should be repeated.

[0020] S4. Statistically determine the transmission failure rate of vehicles equipped with solenoid valves featuring flexible filters with a mesh size of A2 that have entered the market;

[0021] S41. If the failure rate is less than or equal to B, then A2 is the appropriate specification for the flexible filter screen;

[0022] S42. If the failure rate is greater than B, a flexible filter with a smaller mesh size needs to be replaced, and S2-S4 should be repeated.

[0023] Based on the above technical means, the specifications of the elastic filter required for different vehicles and different transmission systems can be determined.

[0024] Furthermore, in S3, before conducting NVH evaluation, shift shock evaluation, and urban road adaptability test, the vehicle needs to undergo static shift self-learning and dynamic shift self-learning.

[0025] The static shift self-learning is performed by having the vehicle stationary and the engine started on a flat road, operating the shifter to switch between D and N gears five times, and then operating the shifter to switch between R and N gears five times. This completes the static shift self-learning.

[0026] The dynamic shift self-learning process involves starting the vehicle engine on a flat road surface, accelerating the vehicle to 100 km / h with a throttle opening of 20-35%, and then controlling the vehicle to decelerate evenly to a stop. This process is repeated 5 times to complete the dynamic shift self-learning.

[0027] Based on the above technical means, it is ensured that the transmission system of the vehicle under test is in a relatively stable state before conducting NVH evaluation, shift shock evaluation and urban road adaptability test.

[0028] Furthermore, after the vehicle completes static shift self-learning and dynamic shift self-learning, it still needs to undergo a break-in period. After the break-in period is completed, NVH evaluation, shift shock evaluation, and urban road adaptability test will be conducted.

[0029] The break-in mileage is 50-100km.

[0030] Based on the above technical means, the vehicle is guaranteed to be in good working condition when conducting NVH evaluation, shift shock evaluation, and urban road adaptability test.

[0031] Furthermore, the NVH evaluation method is as follows:

[0032] Drive the vehicle at throttle openings of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% respectively, and perform upshift and downshift operations while driving. At the same time, measure the NVH difference between the vehicle interior noise and the background noise. If the NVH difference between the noise and the background noise is not greater than 6 dB, it is qualified.

[0033] According to the above technical means, it is possible to test the NVH level of the vehicle's transmission when shifting gears at different throttle openings after equipping a certain specification of elastic filter screen.

[0034] Furthermore, the method for evaluating the shift shock degree is as follows:

[0035] Drive the vehicle at throttle openings of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% respectively, and perform upshift and downshift operations while driving. If the shift shock degree during upshift and downshift operations is not greater than 0.5 m / s 2 then it is qualified.

[0036] According to the above technical means, it is possible to test the smoothness of the vehicle's transmission when shifting gears at different throttle openings after equipping a certain specification of elastic filter screen.

[0037] Furthermore, the urban road adaptability test is as follows:

[0038] Drive the vehicle on urban roads for 1000 - 1500 km. If no abnormalities occur in the transmission during the driving process, it is qualified.

[0039] According to the above technical means, it is possible to test the working conditions of the vehicle's transmission in urban roads with complex road conditions after equipping a certain specification of elastic filter screen.

[0040] Furthermore, B is 0.02%.

[0041] According to the above technical means, it can ensure that vehicles equipped with a certain specification of elastic filter screen have sufficient reliability after being put into the market.

[0042] Advantages of the present invention:

[0043] (1) The present invention has a number of grooves provided on the solenoid valve, and the control oil port and the oil inlet port are provided in the grooves. An elastic filter screen is provided in the grooves. Since the elastic filter screen has elasticity and openings are provided on the elastic filter screen, the elastic filter screen can be embedded in the grooves or taken out of the grooves by expanding the openings, thereby greatly improving the convenience of replacing the elastic filter screen;

[0044] (2) The present invention provides a method for determining filter specifications, thereby determining the appropriate elastic filter specifications required for different vehicles and different transmission systems. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the hydraulic system of the transmission in this invention;

[0046] Figure 2 This is a schematic diagram of the structure of the solenoid valve body in this invention;

[0047] Figure 3 This is a schematic diagram of the structure of the elastic filter screen in this invention;

[0048] Figure 4 This is a schematic diagram illustrating the change in the self-cleaning pulse frequency in this invention;

[0049] Figure 5 This is a flowchart illustrating the method for determining filter specifications according to the present invention.

[0050] Wherein, 1-Solenoid valve body; 2-Elastic filter screen; 3-First groove; 4-Second groove; 5-Protrusion; 6-Oil inlet; 7-Control oil port; 8-Opening; 9-Hydraulic system; 10-Self-cleaning pulse frequency X; 11-Self-cleaning pulse frequency X+Y. Detailed Implementation

[0051] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0052] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0053] This embodiment proposes a solenoid valve with a replaceable filter screen, referring to... Figure 1 , Figure 2 and Figure 3The system includes a solenoid valve body 1, which has several grooves. Each groove contains an oil inlet 6 and a control oil inlet 7. An elastic filter screen 2 is embedded within the grooves, covering both the control oil inlet 7 and the oil inlet 6. The elastic filter screen 2 has an opening 8. The solenoid valve body 1 is a linear solenoid valve, installed in the hydraulic system 9 of the vehicle transmission. The hydraulic system 9 has multiple solenoid valve bodies 1. Because the elastic filter screen 2 is elastic and has an opening 8, the solenoid valve body can be passed through the enlarged opening 8 by expanding the opening 8, allowing the elastic filter screen 2 to be either locked within or removed from the grooves, thus greatly improving the ease of replacing the elastic filter screen 2. The elastic filter screen 2 is made of metal or alloy; in this embodiment, titanium is preferred. Furthermore, the solenoid valve in this embodiment has a pulse self-cleaning function.

[0054] In this embodiment, refer to Figure 3 The elastic filter 2 has a protrusion 5 near the opening 8. The elastic filter 2 is annular, and due to the presence of the opening 8, it takes on a "C" shape. The protrusion 5 is formed by the elastic filter 2 being rolled up near the opening 8, creating two cylinders. By providing the protrusion 5, when replacing the elastic filter 2, the opening 8 can be enlarged simply by squeezing the protrusion 5 with your hand, without the need for tools, making it convenient and quick.

[0055] In this embodiment, refer to Figure 2 and Figure 3 The groove includes a first groove 3 and a second groove 4. The oil inlet 6 is located in the first groove 3, and the control oil inlet 7 is located in the second groove 4. Both the first groove 3 and the second groove 4 are equipped with elastic filters 2. By placing the control oil inlet 7 and the oil inlet 6 in different grooves, the elastic filters 2 in the first groove 3 or the second groove 4 can be replaced separately according to the actual situation.

[0056] Reference Figure 4 and Figure 5 In this embodiment, a method for determining the specifications of the elastic filter 2 and the self-cleaning pulse frequency of the solenoid valve is also proposed, including the following steps:

[0057] S1. Statistical analysis of the transmission failure rate of vehicles with a flexible filter screen with a mesh size of A1 and a solenoid valve with a self-cleaning pulse frequency set to X.

[0058] S11. If the failure rate is less than 0.02%, then A1 is the appropriate specification for the elastic filter 2, and X is the appropriate self-cleaning pulse frequency for the solenoid valve.

[0059] S12. If the failure rate is greater than 0.02%, then perform NVH evaluation and shift shock evaluation on vehicles with elastic filter screen 2 with mesh size A1 and solenoid valve with self-cleaning pulse frequency set to X, and record the NVH evaluation and shift shock evaluation results.

[0060] S2. Replace the elastic filter 2 of the solenoid valve in the vehicle transmission hydraulic system 9 with A2, and change the self-cleaning pulse frequency of the solenoid valve to X+Y (Y≥1);

[0061] S3. Conduct static shift self-learning and dynamic shift self-learning NVH evaluation, shift shock evaluation, and urban road adaptability test on vehicles with elastic filter screen 2 with mesh size A2 and solenoid valve with self-cleaning pulse frequency X+Y.

[0062] S31. If the results of the NVH evaluation, shift shock evaluation and urban road adaptability test are qualified, the vehicle with a solenoid valve having an elastic filter screen 2 with a mesh size of A2 and a self-cleaning pulse frequency of X+Y will be put on the market.

[0063] S32. If the results of the NVH evaluation, shift impact evaluation and urban road adaptability test are unqualified, it is necessary to replace the elastic filter 2 with one with a larger mesh size, reduce the value of Y, and repeat S2-S3.

[0064] S4. Statistically analyze the transmission failure rate of vehicles with elastic filters with a mesh size of A2 and solenoid valves with a self-cleaning pulse frequency of X+Y that have entered the market.

[0065] S41. If the failure rate is less than 0.02%, then A2 is the appropriate specification for the elastic filter 2, and X is the appropriate self-cleaning pulse frequency for the solenoid valve.

[0066] S42. If the failure rate is greater than 0.02%, it is necessary to replace the elastic filter 2 with one with a smaller mesh size, increase the value of Y, and repeat S2-S4.

[0067] The above-mentioned static shift self-learning is performed by having the vehicle stationary and the engine started on a flat road, operating the shifter to switch between D and N gears five times, and then operating the shifter to switch between R and N gears five times. This completes the static shift self-learning.

[0068] The above-mentioned dynamic shift self-learning is to start the vehicle engine on a flat road, accelerate the vehicle to 100km / h with a throttle opening of 20-35%, and then control the vehicle to decelerate evenly to a stop. Repeat the above operation 5 times to complete the dynamic shift self-learning.

[0069] After the vehicle completes static shift self-learning and dynamic shift self-learning, it still needs to be run-in. After the run-in is completed, NVH evaluation, shift shock evaluation, and urban road adaptability test are carried out. The run-in mileage is 50 - 100 km. Ensure that before the NVH evaluation, shift shock evaluation, and urban road adaptability test are carried out, the transmission system of the vehicle to be tested is in a relatively stable state, and it can also ensure that the vehicle condition is good.

[0070] The above NVH evaluation method is as follows: Drive the vehicle at throttle openings of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% respectively, and perform upshift and downshift operations while driving. At the same time, measure the NVH difference between the in-vehicle noise and the background noise. If the NVH difference between the noise and the background noise is not greater than 6 dB, it is qualified.

[0071] The above shift shock evaluation method is as follows:

[0072] Drive the vehicle at throttle openings of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% respectively, and perform upshift and downshift operations while driving. If the shift shock during upshift and downshift operations is not greater than 0.5 m / s², it is qualified.

[0073] The above urban road adaptability test is as follows: Drive the vehicle on urban roads for 1000 - 1500 km. If no abnormality occurs in the transmission during the driving process, it is qualified. An abnormality in the transmission means that the instrument panel shows a transmission fault or abnormal shifting and speed change.

[0074] The above embodiments are only preferred embodiments cited to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. A method for determining the specifications of a flexible filter screen of a replaceable filter screen solenoid valve, the solenoid valve comprising a solenoid valve body (1) provided with a plurality of grooves, an oil inlet (6) and a control oil port (7) being provided in the grooves; a flexible filter screen (2) being embedded in the grooves, the flexible filter screen (2) covering the control oil port (7) and the oil inlet (6); the flexible filter screen (2) being provided with an opening (8); characterized in that: Comprising the following steps: S1. Count the transmission failure rate of the vehicle with the electromagnetic valve of the elastic filter screen (2) with mesh size A1; S11. If the failure rate is less than or equal to B, then A1 is the appropriate size of the elastic filter screen (2); S12. If the failure rate is greater than B, then the vehicle with the electromagnetic valve of the elastic filter screen (2) with mesh size A1 is evaluated for NVH and shift shock, and the results of the NVH and shift shock evaluation are recorded; S2. Change the size of the elastic filter screen (2) of the electromagnetic valve in the transmission hydraulic system of the vehicle to A2; S3. Evaluate the vehicle with the electromagnetic valve of the elastic filter screen (2) with mesh size A2 for NVH, shift shock, and urban road adaptability test; S31. If the results of the NVH, shift shock, and urban road adaptability test are qualified, then the vehicle with the electromagnetic valve of the elastic filter screen (2) with mesh size A2 is put on the market; S32. If the results of the NVH, shift shock, and urban road adaptability test are not qualified, then the elastic filter screen (2) with a larger mesh size needs to be replaced, and S2-S3 is repeated; S4. Count the transmission failure rate of the vehicle with the electromagnetic valve of the elastic filter screen (2) with mesh size A2 put on the market; S41. If the failure rate is less than or equal to B, then A2 is the appropriate size of the elastic filter screen (2); S42. If the failure rate is greater than B, then the elastic filter screen (2) with a smaller mesh size needs to be replaced, and S2-S4 is repeated.

2. The method of determining the specification of the elastic filter of the solenoid valve of the replaceable filter screen according to claim 1, characterized in that: In S3, before the NVH evaluation, shift shock evaluation, and urban road adaptability test, the vehicle needs to be subjected to static shift self-learning and dynamic shift self-learning; The static shift self-learning is to start the engine while the vehicle is stationary on flat road, and switch the gear lever 5 times in the order of D - N - D, and then switch the gear lever 5 times in the order of R - N - R, which completes the static shift self-learning; The dynamic shift self-learning is to start the engine of the vehicle on flat road, accelerate the vehicle to 100 km / h at an engine speed of 20-35%, and then control the vehicle to uniformly decelerate to a stop, repeating the above operation 5 times, which completes the dynamic shift self-learning.

3. The method of determining the specification of the elastic filter of the solenoid valve of the replaceable filter screen according to claim 2, characterized in that: After the vehicle completes the static shift self-learning and dynamic shift self-learning, it also needs to be run-in, and after the run-in is completed, the NVH evaluation, shift shock evaluation, and urban road adaptability test are performed; The run-in mileage is 50-100 km.

4. The method of determining the specification of the elastic filter of the solenoid valve of the replaceable filter screen according to claim 1, characterized in that: The NVH evaluation method is: Drive the vehicle at 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% engine speed, and perform upshift and downshift operations while driving, and measure the NVH difference between the noise and the background sound, if the NVH difference between the noise and the background sound is not greater than 6 dB, it is qualified.

5. The method of determining the specification of the elastic filter of the solenoid valve of the replaceable filter screen according to claim 1, characterized in that: The shift shock evaluation method is: The vehicle is driven at 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% throttle opening, and upshift and downshift operations are performed while driving, and if the shift shock degree during the upshift and downshift operations is not greater than 0.5 m / s 2 then it is qualified.

6. The method of determining the specification of the elastic filter of the solenoid valve of the replaceable filter screen according to claim 1, characterized in that: The urban road adaptability test is: Drive the vehicle on urban roads for 1000-1500 km, and if the transmission does not appear abnormal during driving, it is qualified.

7. The method of determining the specification of the elastic filter of the solenoid valve of the replaceable filter screen according to claim 1, characterized in that: The B is 0.02%.

8. The method of determining the specification of the elastic filter of the solenoid valve of the replaceable filter screen according to claim 1, characterized in that: The elastic filter screen (2) is provided with a protrusion (5) at a position close to the opening (8).

9. The method of determining the specification of the flexible filter of the solenoid valve of the replaceable filter according to claim 1, characterized in that: The groove comprises a first groove (3) and a second groove (4), the oil inlet (6) is arranged in the first groove (3), and the control oil port (7) is arranged in the second groove (4); the first groove (3) and the second groove (4) are both provided with the elastic filter screen (2).

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