Electric control prefill valve and control method thereof

Abstract

The invention relates to the technical field of fluid control, in particular to an electric control prefill valve and a control method thereof.The electric control prefill valve comprises a valve body, a priority valve, an electromagnetic valve, a pressure sensor and a selector valve, the valve body is provided with a main oil way, a prefill opening and an unloading opening, the priority valve, the electromagnetic valve and the selector valve are sequentially arranged along the main oil way and communicate with one another, and the prefill opening communicates with the priority valve; an oil return port of the electromagnetic valve is communicated with the unloading port; the pressure sensor comprises a lower limit sensor and an upper limit sensor; the sensing end of the lower limit sensor is communicated with the main oil way; the upper limit sensor is vertically arranged above the valve body, and the sensing end of the upper limit sensor is communicated with the main oil way. The hydraulic system has the advantages that the hydraulic system pipeline is simplified, the leakage risk is reduced, the hydraulic pressure at the working oil port can be adjusted according to the actual situation, and the energy utilization efficiency, the response speed and the reliability of the braking system are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of fluid control technology, and in particular to an electrically controlled filling valve and its control method. Background Technology

[0002] In the field of hydraulic systems, the filling valve, as a crucial control component, plays a key role in the normal operation of the entire system due to its performance and reliability. With the continuous development of industrial automation, hydraulic systems are placing higher demands on the control precision, flexibility, and cost-effectiveness of filling valves. The performance of the filling valve directly affects the working efficiency, stability, and energy consumption of the hydraulic system; therefore, developing high-performance filling valves is of great significance for improving the overall performance of hydraulic systems and reducing operating costs.

[0003] In the existing technology, the working port of the filling valve is connected to an external device, and there is a certain demand for the hydraulic pressure of the working port. When the oil reaches the working port, a certain hydraulic pressure will be formed. When the hydraulic pressure reaches the required amount of oil for the external device, the excess oil needs to be unloaded through the unloading valve to maintain stability.

[0004] However, when the external equipment is replaced, if the required oil volume or oil pressure of the subsequent equipment is different from that of the previous equipment, it is necessary to replace internal parts or change the size of the working oil port, which increases costs and affects work efficiency, resulting in low work adaptability. Summary of the Invention

[0005] In order to adjust the flow rate of oil at the working port according to the actual situation and improve the adaptability of the work, the purpose of this application is to provide an electronically controlled filling valve and its control method.

[0006] Firstly, the electrically controlled liquid filling valve provided in this application adopts the following technical solution: This includes the valve body, priority valve, solenoid valve, pressure sensor, and selector valve. The valve body is equipped with a main oil passage, a filling port, and an unloading port; The priority valve, solenoid valve, and selector valve are sequentially arranged and connected along the main oil circuit; the filling port is connected to the priority valve; and the return port of the solenoid valve is connected to the unloading port. The pressure sensor includes a lower limit sensor and an upper limit sensor; the lower limit sensor is placed horizontally and its sensing end is connected to the main oil circuit; the upper limit sensor is vertically arranged above the valve body, and its sensing end is connected to the main oil circuit.

[0007] By adopting the above technical solution, the pressure sensor monitors the main oil circuit pressure in real time and feeds it back to the external control unit. The control unit automatically controls the opening and closing of the solenoid valve, i.e., the opening size, according to preset logic, thereby precisely managing the filling and unloading process, as well as the oil volume at the working port. It can adapt to equipment with different oil volume requirements according to actual conditions, thus improving operational adaptability. This electronic control method replaces the traditional purely mechanical or hydraulic control, simplifies the hydraulic system pipeline, and significantly improves energy utilization efficiency, response speed, and braking system reliability.

[0008] Optionally, a one-way valve is also provided in the main oil circuit. The one-way valve is located between the priority valve and the solenoid valve. The one-way valve includes a valve chamber, a valve ball and a spring. One end of the valve chamber is provided with an oil inlet and the side wall of the valve chamber is provided with an oil outlet. The priority valve is connected to the oil inlet. The valve ball is located at the oil inlet and the spring is located on the side of the valve ball away from the oil inlet.

[0009] By adopting the above technical solution, it is possible to effectively prevent backflow of oil in the accumulator or other high-pressure oil circuits when the system stops charging or unloading. This ensures that the main oil circuit pressure is maintained, avoids system response delays or pressure fluctuations caused by pressure backflow, and ensures the stability of the charging valve operation. At the same time, the check valve adopts a simple valve ball and spring structure, which has the advantages of low cost, good sealing performance, and sensitive action, and can quickly respond and cut off the reverse oil flow.

[0010] Optionally, a filter screen is also provided in the main oil circuit, and the filter screen is closely attached to the oil inlet of the valve chamber.

[0011] By adopting the above technical solution, the hydraulic fluid entering the main oil circuit and check valve can be filtered as a final barrier. This effectively intercepts tiny impurity particles carried in the hydraulic oil, preventing them from jamming the valve ball of the check valve and causing poor sealing, or from wearing out precision components such as the valve core and solenoid valve. This significantly improves the overall contamination resistance, operational reliability, and service life of the filling valve, and reduces the system failure rate.

[0012] Optionally, a throttling plate is provided at the oil inlet.

[0013] By adopting the above technical solution, the flow rate of oil flowing into the main oil circuit can be limited, thus buffering and stabilizing the flow. This prevents damage to the check valve ball, spring, and downstream solenoid valve caused by sudden large flow shocks, while also reducing pressure fluctuations and making the filling process smoother. By matching throttling plates with different orifice diameters, the filling speed can also be flexibly adjusted to meet the needs of different braking systems, enhancing the product's versatility.

[0014] Optionally, the valve body is provided with a first working oil port, the priority valve includes a valve core, a hydraulic chamber is formed between the end of the valve core and the valve body, an internal flow channel is provided inside the valve core, the internal flow channel connects the filling port and the hydraulic chamber, when the hydraulic chamber is filled with oil to a certain amount, the valve core moves, at this time, the first working oil port is connected to the filling port.

[0015] By adopting the above technical solution, the internal flow channel of the valve core is utilized to achieve the function of priority filling. When hydraulic oil enters from the filling port, it first enters the hydraulic chamber at the end of the valve core through the internal flow channel, pushing the valve core to move. Only after the hydraulic chamber is filled and the valve core is pushed into place will the first working port connect with the filling port.

[0016] Optionally, the valve body is further provided with a second working port and a third working port, both of which are connected to the selector valve.

[0017] By adopting the above technical solution, the filling valve can flexibly serve multi-circuit hydraulic systems (such as dual-circuit braking systems). The selector valve can automatically switch oil circuits based on signals from pressure sensors or instructions from external control units, achieving selective oil supply or isolation for different working circuits. This greatly expands the valve's functionality, enabling its application in more complex hydraulic systems and improving system integration and control flexibility.

[0018] Optionally, it also includes an overflow valve, which is disposed in the valve body and connected to the main oil circuit, for limiting the maximum pressure value of the main oil circuit.

[0019] By adopting the above technical solution, overload protection is provided for the main oil circuit. When the system pressure continues to rise and exceeds the set safety value due to some fault (such as solenoid valve sticking or control logic error), the relief valve will immediately open to discharge the high-pressure oil back to the oil tank or unloading port, thereby limiting the maximum pressure of the main oil circuit. This effectively prevents damage to pressure sensors, seals, downstream accumulators, pipelines, and other components due to excessive pressure, ensuring the safety of the entire hydraulic system.

[0020] Optionally, the solenoid valve is a standard interface two-position three-way solenoid valve or a two-position two-way solenoid valve.

[0021] By adopting the above technical solutions, standardized interfaces and installation dimensions mean that the market supply of this type of solenoid valve is sufficient, procurement costs are low, and it is easy to replace and repair. It eliminates the need to rely on non-standard customized parts from specific manufacturers, greatly reducing manufacturing and subsequent maintenance costs. At the same time, the "two-position three-way" or "two-position two-way" specifications can fully meet the functional requirements of filling the second end chamber of the control priority valve (through the oil inlet of the three-way valve) and unloading (through the oil return port of the three-way valve or the opening and closing of the two-way valve). The design functions are realized with the most mature and economical standardized components, reflecting the design concept of balancing cost-effectiveness and supply chain security while meeting performance requirements.

[0022] Secondly, the control method for an electrically controlled filling valve provided in this application adopts the following technical solution: This includes methods for controlling the electronically controlled filling valve, with the following steps: S1: Supplying oil into the electronically controlled filling valve; S2: When the oil touches the upper limit sensor, it means that the electronic filling valve is full of oil. At this time, the return port of the solenoid valve is opened to let the excess oil flow out from the unloading port. S3: When the working oil port is connected to an external device and starts to consume oil, the oil volume in the electronically controlled filling valve begins to decrease. When the oil volume drops to the point where the lower limit sensor detects a decrease in pressure or no pressure, a feedback signal is sent to the oil pump at the filling port to increase the amount of oil entering the filling port. The upper limit sensor sends a feedback signal to unload the excess oil. S4: When the external equipment is replaced and the required oil volume decreases, the upper limit sensor 402 feeds back a pressure signal, and the opening of the solenoid valve 3 decreases; when the external equipment is replaced and the required oil volume increases, the upper limit sensor 402 feeds back a pressure signal, and the opening of the solenoid valve 3 increases.

[0023] By adopting the above technical solution, upper and lower limit sensors monitor the oil volume changes in the valve in real time. When the valve is full of oil, the solenoid valve return port automatically opens to unload the system and prevent overload. When external equipment consumes oil, causing a pressure drop, a feedback signal is quickly sent to drive the oil pump to replenish oil, ensuring a continuous and stable oil supply. Particularly noteworthy is its ability to automatically adjust the solenoid valve opening size based on the varying oil volume demands caused by external equipment replacement, using the pressure signal from the upper limit sensor to intelligently match load changes. This not only achieves full automation of the filling and unloading process, reducing manual intervention, but also enhances the equipment's adaptability to different operating conditions.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. A pressure sensor monitors the main oil circuit pressure in real time and feeds it back to an external control unit. The control unit automatically controls the opening and closing of the solenoid valve (i.e., the opening size) according to preset logic, thereby precisely managing the filling and unloading process and the oil volume at the working port. It can adapt to equipment with different oil volume requirements according to actual conditions, thus improving operational adaptability. This electronic control method replaces the traditional purely mechanical or hydraulic control, significantly improving energy utilization efficiency, response speed, and the reliability of the braking system. 2. By using a layout of upper and lower limit dual pressure sensors, precise closed-loop control of the accumulator pressure in different sections is achieved, ensuring that the pressure is always maintained within the optimal operating range, effectively preventing undervoltage or overvoltage, and extending the system life. 3. The relief valve protects the system from damage caused by excessive pressure, improving the system's safety and reliability; 4. Multiple working ports are used in conjunction with a selector valve, enabling it to flexibly serve multi-circuit hydraulic systems; 5. The use of solenoid valves with standard interfaces makes the system more interchangeable and maintainable, reduces maintenance costs and difficulty, and facilitates the standardization and modular design of the system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall top structure of the electronically controlled filling valve; Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of section AA in the middle; Figure 3 This is a schematic diagram of the back of the electronically controlled filling valve. Figure 4 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle BB section; Figure 5 This is a cross-sectional view of the top of the electrically controlled filling valve; In the picture, 1. Valve body; 101. Main oil circuit; 102. Filling port; 103. Unloading port; 2. Priority valve, 201. Valve core, 202. Internal flow channel; 3. Solenoid valve; 4. Pressure sensor, 401, lower limit sensor, 402, upper limit sensor; 5. Select valve; 6. Check valve, 601. Valve chamber, 602. Valve ball, 603. Spring, 604. Oil inlet, 605. Oil outlet; 7. Hydraulic chamber; 8. Filter screen; 9. Relief valve; 10. First working oil port; 11. Second working oil port; 12. Third working oil port. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0027] Example 1: An electrically controlled filling valve, as described above Figure 1 and Figure 2 The system includes a valve body 1, a priority valve 2, a solenoid valve 3, a pressure sensor 4, and a selector valve 5. The priority valve 2, solenoid valve 3, and selector valve 5 are sequentially arranged and connected along the main oil circuit 101. The filling port 102 is connected to the priority valve 2, and the return port of the solenoid valve 3 is connected to the unloading port 103. The pressure sensor 4 is installed on the valve body 1 and connected to the main oil circuit 101. This structure enables the pressure sensor 4 to detect the pressure of the main oil circuit 101 and provide an electrical signal to an external control unit. The external control unit then controls the opening and closing state of the solenoid valve 3, realizing the flexible switching between the filling and unloading states of the filling valve and improving the control accuracy and flexibility of the filling valve.

[0028] Specifically, refer to Figure 2 The valve body 1 is equipped with a main oil passage 101, a filling port 102, and an unloading port 103. The valve body 1 is generally made of metal, such as cast iron or aluminum alloy, which has good strength and corrosion resistance. Its shape is designed according to actual installation and usage requirements. The main oil passage 101 is rationally arranged within the valve body 1 to ensure smooth oil flow. The filling port 102 is used to inject oil into the system, and the unloading port 103 is used to drain excess oil. The valve body 1 can be manufactured by casting or machining to ensure the sealing and precision of the internal oil passages.

[0029] Furthermore, refer to Figure 2 The priority valve 2 includes components such as the valve core 201. The valve core 201 is typically cylindrical and made of a wear-resistant metal material, such as stainless steel. The valve core 201 can move linearly within the valve body 1, and its surface is finely machined to ensure the fitting accuracy with the valve body 1.

[0030] Furthermore, refer to Figure 2 and Figure 3 The valve body 1 is provided with a first working port 10. A hydraulic chamber 7 is formed between the end of the valve core 201 of the priority valve 2 and the valve body 1. An internal flow channel 202 is provided inside the valve core 201, which connects the filling port 102 and the hydraulic chamber 7. When the hydraulic chamber 7 is filled with oil to a certain amount, the valve core 201 moves, and at this time, the first working port 10 is connected to the filling port 102. This structure allows the priority valve 2 to automatically adjust the connection state between the first working port 10 and the filling port 102 according to the amount of oil in the hydraulic chamber 7.

[0031] The valve core 201 of the priority valve 2 has an internal flow channel 202. A hydraulic chamber 7 is formed between the valve core 201 and the valve body 1. The internal flow channel 202 connects the filling port 102 and the hydraulic chamber 7. Therefore, an opening is provided on the side wall of the valve core 201. Oil enters the hydraulic chamber 7 through the internal flow channel 202 from the opening. Subsequently, the oil continuously fills the hydraulic chamber 7 until it is full. After the filling continues, the hydraulic pressure in the hydraulic chamber 7 will increase, thereby pushing the valve core 201 to move to the right.

[0032] In the initial stage, the filling port 102 and the first working oil port 10 are misaligned, and the valve core 201 has a protruding part that blocks the passage between the filling port 102 and the first working oil port 10. When the valve core 201 moves to the right due to the increase in hydraulic pressure in the hydraulic chamber 7, the concave part of the valve core 201 will be between the filling port 102 and the first working oil port 10. The oil flows from the filling port 102 to the first working oil port 10 through the concave part. The first working oil port 10 is connected to the external equipment to complete the oil supply to the external equipment.

[0033] Furthermore, solenoid valve 3 can be a standard-interface 2-position 3-way solenoid valve or a 2-position 2-way solenoid valve. The 2-position 3-way solenoid valve has three ports, enabling switching between different flow directions of the oil; the 2-position 2-way solenoid valve has two ports, primarily used to control the on / off state of the oil. When the coil of solenoid valve 3 is energized, the valve core 201 actuates, changing the flow state of the oil. Solenoid valve 3 uses a standard interface design, facilitating replacement and maintenance, and reducing maintenance costs.

[0034] Furthermore, refer to Figure 4 The pressure sensor 4 includes a lower limit sensor 401 and an upper limit sensor 402. The lower limit sensor 401 and upper limit sensor 402 are generally piezoelectric or strain gauge sensors, capable of converting pressure signals into electrical signals. The sensing end of the lower limit sensor 401 is connected to the oil outlet 605 on the side wall of the valve chamber 601 via an oil passage, used to detect the lower limit pressure in the main oil passage 101. The upper limit sensor 402 is located above the check valve 6, and its sensing end is connected to the main oil passage 101 between the check valve 6 and the solenoid valve 3 via an oil passage, used to detect the upper limit pressure in the main oil passage 101. When the pressure in the main oil passage 101 reaches the set upper and lower limit thresholds, the pressure sensor 4 transmits a signal to the external control unit, which then controls the opening and closing of the solenoid valve 3 according to the signal.

[0035] Furthermore, refer to Figure 4 Selector valve 5 is used to select different working ports. It can guide the oil to different working ports according to actual working requirements. The structure of selector valve 5 is similar to that of a common directional valve, and the direction of oil flow is changed by the movement of valve core 201.

[0036] Furthermore, refer to Figure 5A one-way valve 6 is also installed in the main oil circuit 101, located between the priority valve 2 and the solenoid valve 3. The one-way valve 6 includes a valve chamber 601, a valve ball 602, and a spring 603. The valve chamber 601 is generally cylindrical and made of metal, with an oil inlet 604 at one end and an oil outlet 605 on the side wall of the valve chamber 601. The priority valve 2 is connected to the oil inlet 604, the valve ball 602 is located at the oil inlet 604, and the spring 603 is located on the side of the valve ball 602 away from the oil inlet 604. When oil flows from the priority valve 2 to the solenoid valve 3, the oil pressure pushes the valve ball 602 to overcome the elastic force of the spring 603, allowing the oil to flow out through the oil outlet 605 on the side wall of the valve chamber 601; when the oil flows in the reverse direction, the valve ball 602 blocks the oil inlet 604 under the action of the spring 603 to prevent backflow of oil.

[0037] Furthermore, refer to Figure 5 A filter screen 8 is also installed in the main oil circuit 101. The filter screen 8 is usually made of metal wire mesh or filter paper and is cylindrical. One end of the filter screen 8 is close to the oil inlet 604 of the valve chamber 601. The oil first passes through the filter screen 8 and then enters the one-way valve 6. The function of the filter screen 8 is to filter impurities in the oil, prevent impurities from entering the valve chamber 601 and other components, and ensure the normal operation of the system.

[0038] Furthermore, a throttling vane is installed at the oil inlet 604. The throttling vane is generally a thin, circular plate with a small hole in the center. The flow rate of the oil is adjusted by changing the size of the hole. The throttling vane can control the speed at which the oil enters the valve chamber 601, thereby affecting the working performance of the check valve 6.

[0039] Furthermore, refer to Figure 3 and Figure 4 The valve body 1 is also provided with a second working port 11 and a third working port 12, both of which are connected to the selector valve 5. The selector valve 5 can guide the oil to the second working port 11 or the third working port 12 according to actual needs to meet different working requirements.

[0040] Furthermore, it also includes a relief valve 9, which is disposed within the valve body 1 and connected to the main oil circuit 101, used to limit the maximum pressure value of the main oil circuit 101. The relief valve 9 generally adopts a spring 603 type structure. When the pressure of the main oil circuit 101 exceeds the set maximum pressure value, the valve core 201 of the relief valve 9 will be pushed open, allowing excess oil to flow back to the oil tank through the relief valve 9, thereby ensuring that the pressure of the main oil circuit 101 is within a safe range.

[0041] The implementation principle of this embodiment is as follows: The electrically controlled filling valve detects the pressure of the main oil circuit 101 through the pressure sensor 4, converts the pressure signal into an electrical signal, and transmits it to the external control unit. The external control unit controls the opening and closing state of the solenoid valve 3 according to the received signal, thereby changing the pressure at both ends of the priority valve 2, realizing the reversal of the system oil circuit, and thus controlling the filling and unloading states of the filling valve. Compared with the prior art, using an industry-standard solenoid valve 3 instead of a mechanical unloading valve reduces the processing difficulty and cost of parts, and improves the control accuracy and redundancy of the upper and lower pressure limits. At the same time, the reasonable layout and mutual cooperation of the components make the performance of the filling valve more stable, enabling it to adapt to different working environments and conditions, thus ensuring the stable operation of the hydraulic system.

[0042] Example 2: This application provides a control method for an electrically controlled liquid filling valve, the method steps of which are as follows: When the filling port 102 is connected to an external oil pump, the pump delivers oil, which enters the main oil circuit 101 through the filling port 102. Above the priority valve 2, there is an oil passage connecting to the check valve 6. The oil passes through the filter screen 8 and the throttle plate through this passage to the check valve 6. The oil then pushes the valve ball 602 of the check valve 6, which compresses the spring 603, thereby opening the oil inlet 604 of the check valve 6. The oil enters the valve chamber 601 of the check valve 6, and then flows from the oil outlet 605 on the side of the valve chamber 601 to the sensing end of the lower limit sensor 401 and the solenoid valve 3. The oil through the solenoid valve 3 flows to the selector valve 5, and finally is supplied to the corresponding connected external equipment through the second working oil port 11 and the third working oil port 12. The main oil circuit 101 between the check valve 6 and the solenoid valve 3 is connected to the sensing end of the upper limit sensor 402 through the oil circuit.

[0043] The lower limit sensor 401 ensures the lower limit of the filling valve and the oil supply pressure, preventing insufficient oil pressure from causing untimely oil supply and affecting the operation of the equipment. When the filling valve is full of oil, the oil will rise through the oil circuit between the check valve 6 and the solenoid valve 3, and finally contact the upper limit sensor 402. At this time, it will indicate that the internal pressure is sufficient and the excess oil needs to be discharged. The solenoid valve 3 will receive the signal and choose whether to open. After opening, the excess oil will flow out through the return port of the solenoid valve 3 through the oil circuit and finally out of the unloading port 103, preventing the hydraulic pressure in the filling valve from being too high and causing problems.

[0044] When the external equipment is replaced and the required oil volume decreases, the upper limit sensor 402 sends a pressure signal, and the opening of the solenoid valve 3 decreases; similarly, when the external equipment is replaced and the required oil volume increases, the upper limit sensor 402 sends a pressure signal, and the opening of the solenoid valve 3 increases.

[0045] The implementation principle of this application embodiment is as follows: the upper limit sensor 402 and the lower limit sensor 401 monitor the change in oil volume in the valve in real time. When the oil is full, the solenoid valve 3 return port is automatically opened to unload the system and avoid overload. When the pressure drops due to the consumption of oil by external equipment, a feedback signal can be quickly fed back to drive the oil pump to replenish oil, ensuring a continuous and stable oil supply. At the same time, the opening size of the solenoid valve 3 can be automatically adjusted according to the different oil volume requirements caused by the replacement of external equipment, thereby intelligently matching the load change.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electrically controlled liquid filling valve, characterized in that, It includes a valve body (1), a priority valve (2), a solenoid valve (3), a pressure sensor (4), and a selector valve (5); The valve body (1) is provided with a main oil passage (101), a filling port (102) and an unloading port (103). The priority valve (2), solenoid valve (3) and selector valve (5) are arranged and connected in sequence along the main oil circuit (101), and the filling port (102) is connected to the priority valve (2); the return port of the solenoid valve (3) is connected to the unloading port (103). The pressure sensor (4) includes a lower limit sensor (401) and an upper limit sensor (402); the lower limit sensor (401) is placed horizontally and its sensing end is connected to the main oil circuit (101); the upper limit sensor (402) is vertically arranged above the valve body (1), and the sensing end of the upper limit sensor (402) is connected to the main oil circuit (101).

2. The electrically controlled filling valve according to claim 1, characterized in that, The main oil circuit (101) is also equipped with a one-way valve (6). The one-way valve (6) is located between the priority valve (2) and the solenoid valve (3). The one-way valve (6) includes a valve chamber (601), a valve ball (602) and a spring (603). One end of the valve chamber (601) is provided with an oil inlet (604), and the side wall of the valve chamber (601) is provided with an oil outlet (605). The priority valve (2) is connected to the oil inlet (604). The valve ball (602) is located at the oil inlet (604), and the spring (603) is located on the side of the valve ball (602) away from the oil inlet (604).

3. The electrically controlled filling valve according to claim 2, characterized in that, A filter screen (8) is also provided in the main oil passage (101), and the filter screen (8) is closely attached to the oil inlet (604) of the valve chamber (601).

4. The electrically controlled filling valve according to claim 3, characterized in that, A throttling plate is provided at the oil inlet (604).

5. The electrically controlled filling valve according to claim 1, characterized in that, The valve body (1) is provided with a first working oil port (10). The priority valve (2) includes a valve core (201). A hydraulic chamber (7) is formed between the end of the valve core (201) and the valve body (1). An internal flow channel (202) is provided inside the valve core (201). The internal flow channel (202) connects the filling port (102) and the hydraulic chamber (7). When the hydraulic chamber (7) is filled with oil to a certain amount, the valve core (201) moves. At this time, the first working oil port (10) is connected to the filling port (102).

6. The electrically controlled filling valve according to claim 1, characterized in that, The valve body (1) is also provided with a second working port (11) and a third working port (12), both of which are connected to the selector valve (5).

7. The electrically controlled filling valve according to claim 1, characterized in that, It also includes an overflow valve (9), which is disposed in the valve body (1) and connected to the main oil circuit (101) to limit the maximum pressure value of the main oil circuit (101).

8. The electrically controlled filling valve according to claim 1, characterized in that, The solenoid valve (3) is a standard interface two-position three-way solenoid valve or a two-position two-way solenoid valve.

9. A control method for an electrically controlled liquid filling valve, characterized in that, The method for controlling an electrically controlled filling valve according to any one of claims 1-8 includes the following steps: S1: Supplying oil into the electronically controlled filling valve; S2: When the oil touches the upper limit sensor (402), it means that the electronically controlled filling valve is full of oil. At this time, the return port of the solenoid valve (3) is opened to let the excess oil flow out from the unloading port (103). S3: When the working oil port is connected to an external device and starts to consume oil, the oil volume in the electronically controlled filling valve begins to decrease. When the oil volume drops to the point where the lower limit sensor (401) senses a decrease in pressure or no pressure, a feedback signal is sent to the oil pump at the filling port (102) to increase the oil entering the filling port (102). The upper limit sensor (402) sends a feedback signal to unload the excess oil. S4: When the external equipment is replaced and the required oil volume decreases, the upper limit sensor (402) feeds back a pressure signal and the opening of the solenoid valve (3) decreases; when the external equipment is replaced and the required oil volume increases, the upper limit sensor (402) feeds back a pressure signal and the opening of the solenoid valve (3) increases.

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