A two-stage series bypass valve control device and method

Abstract

The present application relates to turbocharging system control technical field, disclose a kind of two-stage series bypass valve control device and method, device includes: first stage valve, second stage valve and bypass pipeline;The one end of first stage turbocharger bypass valve is connected with the one end of second stage valve by bypass pipeline;The first stage valve is configured to be selectively fixed between multiple preset discrete opening positions, to coarsely adjust bypass flow;The second stage valve is configured to continuously adjust its opening based on the first stage valve being fixed at a certain position, to finely adjust bypass flow.Through the combination use of first valve and second valve, respectively, coarse adjustment and fine adjustment are carried out.This hierarchical control structure effectively improves the flexibility of flow regulation, compared with the traditional single-valve control scheme, solves the problem of limited adjustment range, so that flow distribution can be optimized under different operating conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of turbocharging system control, in particular to a two-stage serial bypass valve control device and method. BACKGROUND

[0002] In the prior art, many flow control systems rely on linear adjustment of a single valve. Such solutions often have limitations in terms of adjustment range and flexibility. When operating conditions change, the fixed opening of a single valve cannot effectively respond to fluctuations in flow demand, leading to uneven flow distribution and affecting overall performance.

[0003] The prior art also often faces challenges in flow stability. Many control schemes lack effective feedback mechanisms and cannot monitor flow changes in real time. This makes the system prone to unstable states in environments with frequent flow fluctuations, leading to reduced efficiency.

[0004] Traditional control strategies often cannot be optimized for different operating conditions. In the face of complex flow state changes, a single adjustment method is insufficient. This results in slow response speed of flow regulation, which cannot adapt to actual demand in a timely manner, thereby affecting the operational reliability of the system. SUMMARY

[0005] To address the shortcomings of the prior art, the present application provides a two-stage serial bypass valve control device and method, which solves the problems of insufficient flexibility, poor stability, and poor adaptability to different operating conditions in the prior art flow regulation.

[0006] To achieve the above purpose, the present application realizes the following technical solutions: a two-stage serial bypass valve control device, comprising:

[0007] a first-stage valve, a second-stage valve, and a bypass pipeline;

[0008] One end of the first-stage supercharger bypass valve is connected to one end of the second-stage valve through the bypass pipeline;

[0009] The first-stage valve is configured to be selectively fixed between a plurality of preset discrete opening positions to coarsely adjust the bypass flow;

[0010] The second-stage valve is configured to continuously adjust its opening based on the first-stage valve being fixed at a certain position to finely adjust the bypass flow.

[0011] Preferably, the first-stage valve is a supercharger bypass valve, and the second-stage valve is a butterfly valve.

[0012] Preferably, the preset opening positions of the first-stage valve include 2°, 5°, 10°, 15°, 20°, and 30°.

[0013] Preferably, the diameter of the first stage valve is 16mm or 20mm.

[0014] A two-stage serial by-pass valve control method, comprising the following steps:

[0015] S1, real-time detection of operating condition parameters, and determining whether the current is in transient condition or steady condition based on the operating condition parameters;

[0016] S2, when it is determined to be in transient condition, the first stage valve is controlled to a preset transient response opening degree of 30°, and the second stage valve is subjected to high-frequency closed-loop adjustment to achieve rapid response to changes;

[0017] S3, it is determined to be in steady condition, and further determines the flow level, which is divided into small flow steady condition and medium-high flow steady condition, and is subjected to coarse adjustment;

[0018] S4, after the preliminary fixation of coarse adjustment is completed, the target split ratio is read, the target opening degree of the second stage valve is calculated according to the proportional control formula, and fine adjustment of the second stage valve is performed;

[0019] S5, after fine adjustment of the second stage valve is performed, the flow change is continuously monitored to determine whether the flow change rate is within the range of less than 1% and lasts for 2 seconds, if not, it returns to S1, and if yes, it indicates that the steady state has been reached, and the opening degrees of the first stage valve and the second stage valve are maintained.

[0020] Preferably, the determination step in the S1 step of determining whether the current is in transient condition or steady condition comprises:

[0021] when the acceleration is greater than 5m / s 2 , it is determined to be in transient condition;

[0022] when the acceleration is less than 5m / s 2 , it is determined to be in steady condition.

[0023] Preferably, the coarse adjustment determines a preliminary flow interval according to the current operating condition parameters, and the opening degree of the first stage valve is adjusted in 2°, 5°, 10°, 15°, 20° and 30°.

[0024] Preferably, in the S3 step, the steady condition is divided into small flow steady condition and medium-high flow steady condition according to whether the flow is less than 30% of the maximum flow;

[0025] when it is small flow steady condition, it is selected in the preset gear of 2°-10°;

[0026] when it is medium-high flow steady condition, it is selected in the preset gear of 15°-30°.

[0027] Preferably, the target opening of the second valve is calculated according to a proportional control formula, and the specific formula is:

[0028] θ2 = K1(θ1) · (Q target -Q actual );

[0029] Wherein, θ2 represents the opening of the target butterfly valve;

[0030] K1(θ1) represents a proportional coefficient related to the input opening θ1;

[0031] θ1 represents the opening of the initial butterfly valve;

[0032] Q target represents the target flow rate;

[0033] Q actual represents the actual flow rate.

[0034] Preferably, the fine adjustment is performed on the premise that the opening of the first valve is fixed, and the target opening of the second valve is calculated to finely adjust the opening of the second valve in the range of 0°-90°.

[0035] The application provides a two-stage serial bypass valve control device and method. The following advantages are provided:

[0036] 1. The application uses the first valve and the second valve in combination to perform coarse adjustment and fine adjustment, respectively. This hierarchical control structure effectively improves the flexibility of flow regulation, solves the problem of limited regulation range compared to the traditional single valve control scheme, and optimizes flow distribution under different working conditions.

[0037] 2. The application continuously monitors flow changes and sets a threshold value through a dynamic feedback system to ensure flow stability. This technology realizes real-time regulation and enhances the adaptive ability of the system. Compared with the prior art, it solves the problems of frequent flow fluctuations and poor stability, and improves the overall operation efficiency.

[0038] 3. The application adopts a control scheme that enhances adaptability and optimizes control for different working conditions through a hierarchical strategy. The implementation of this scheme enables the system to flexibly respond to different flow states and is no longer limited to a single regulation mode. Compared with the practice of lacking targeted strategies in the prior art, the application effectively solves the problem of insufficient flow regulation to cope with complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a perspective view of the application;

[0040] Figure 2 is a plan view of the application;

[0041] Figure 3 A two-stage valve control characteristic curve of the present application;

[0042] Figure 4 A two-stage valve control flow chart of the present application.

[0043] Wherein, 1, first stage valve; 2, second stage valve; 3, bypass pipeline. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the specification of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0045] Please refer to the drawings in the specification of the present application Figure 1 - the drawings in the specification of the present application Figure 2 The embodiments of the present application provide a two-stage series bypass valve control device, comprising:

[0046] The first stage valve 1, the second stage valve 2 and the bypass pipeline 3;

[0047] One end of the first stage supercharger bypass valve 1 is connected with one end of the second stage valve 2 through the bypass pipeline 3, the first stage valve 1 is configured to be selectively fixed between a plurality of preset discrete opening positions, so as to coarsely adjust the bypass flow, the first stage valve 1 is a supercharger bypass valve, the second stage valve 2 is a butterfly valve, the preset opening positions of the first stage valve 1 include 2°, 5°, 10°, 15°, 20° and 30°, and the diameter of the first stage valve 1 is 16 mm or 20 mm.

[0048] The second stage valve 2 is configured to continuously adjust the opening thereof on the basis that the first stage valve 1 is fixed at a certain position, so as to finely adjust the bypass flow.

[0049] Please refer to the drawings in the specification of the present application Figure 3 - the drawings in the specification of the present application Figure 4 A two-stage series bypass valve control method, comprising the following steps:

[0050] S1, real-time detection of operating condition parameters, and judgment of whether the current is in transient condition or steady condition based on the operating condition parameters;

[0051] Specifically, in the S1 step of the present embodiment, the operating condition parameters of the system are first detected in real time, including flow rate, pressure and temperature. These parameters are collected by sensors. Through real-time monitoring, the control system can obtain the dynamic information of the fluid, so as to analyze the state of the system

[0052] In the acquired operating condition data, the current state is determined to be transient or steady state by acceleration calculation. Specifically, when the acceleration exceeds 5m / s 2 , the control system determines it to be transient.

[0053] When the acceleration is less than 5m / s 2 , it is determined to be steady state. This determination ensures that different control strategies are adopted under different flow conditions to achieve accurate flow regulation.

[0054] S2, when it is determined to be in transient state, the first stage valve 1 is controlled to a preset transient response opening 30°, and the second stage valve 2 is adjusted by high frequency closed loop to realize rapid response to changes;

[0055] Specifically, when the current state is determined to be transient in the S2 step of the embodiment, the opening of the first stage valve 1 is first controlled to a preset transient response opening of 30°. This operation is realized through the direct connection of the actuator and the control module to ensure rapid response to flow changes.

[0056] Subsequently, the system will control the second stage valve 2 through a high frequency closed loop adjustment algorithm. This algorithm uses proportional control method for feedback to achieve rapid adjustment of the target flow. Specifically, the control system constantly monitors the flow changes and calculates the flow error in real time, so as to dynamically adjust the opening of the second stage valve 2.

[0057] S3, it is determined to be steady state, and further determines the flow level, which is divided into small flow steady state and medium-high flow steady state, and is coarsely adjusted;

[0058] Specifically, after determining to be steady state in the S3 step of the embodiment, the flow state is first classified according to the real-time detected flow level to distinguish between small flow steady state and medium-high flow steady state. This process is completed by the data acquisition module analyzing the data provided by the flow sensor, thereby ensuring the accuracy of the judgment.

[0059] In the small flow steady state, the first valve 1 is configured to select from a plurality of preset opening positions in the range of 2°-10°. This operation is realized by the control module sending opening instructions to the actuator.

[0060] In the medium-high flow steady state, the first valve 1 is adjusted to an opening range of 15°-30°. This adjustment process is carried out through the same control logic and algorithm, ensuring sufficient flow supply and meeting the system's set operating condition standards.

[0061] S4, after the preliminary fixation of coarse adjustment is completed, the target split ratio is read, the target opening of the second stage valve 2 is calculated according to the proportional control formula, and the fine adjustment of the second stage valve 2 is executed;

[0062] Specifically, in the step S4 of the embodiment, after the coarse adjustment, the current flow data is read and compared with the set target split ratio. This process includes real-time analysis of the data feedback from the flow sensor to ensure the accuracy of the fine-tuning phase. The control system generates real-time feedback based on the collected data, forming a dynamic response mechanism to the target flow.

[0063] According to the deviation between the read target flow value and the actual flow value, a proportional control algorithm is used to calculate the target opening of the second valve. The core of this algorithm is to adjust the valve opening in real time to minimize the error between the target flow and the actual flow. The control system establishes a dynamic model and uses the feedback mechanism of the controller to achieve flow adjustment.

[0064] The calculation process is as follows:

[0065] θ2=K1(θ1)·(Q target -Q actual );

[0066] Where θ2 represents the opening of the target butterfly valve;

[0067] K1(θ1) represents a proportional coefficient related to the input opening θ1;

[0068] θ1 represents the opening of the initial butterfly valve;

[0069] Q target represents the target flow;

[0070] Q actual represents the actual flow.

[0071] Through this calculation, the control system can generate a precise opening value of the second valve to drive the valve's actuator to achieve fine control of the flow.

[0072] In the implementation process, the opening of the first valve 1 remains unchanged, and the opening of the second valve 2 is adjusted in the range of 0°-90° for fine tuning. This design ensures that under the condition that the first valve 1 is fixed, the second valve 2 can be flexibly adjusted to accurately meet the flow requirements

[0073] S5, after fine-tuning the second valve 2, continuously monitor the flow changes, and determine whether the flow change rate is less than 1% and lasts for 2 seconds. If not, return to step S1, if yes, it indicates that the stable state has been reached, and the current opening of the first valve 1 and the second valve 2 is maintained.

[0074] Specifically, in the step S5 of the embodiment, the opening of the second valve 2 is first fine-tuned, and then the flow monitoring phase is entered. In this phase, the flow sensor continuously monitors the flow change to ensure the real-time effectiveness of the data. This process utilizes the pre-set relationship between the valve opening and the actual flow for dynamic feedback to achieve effective flow stability monitoring.

[0075] When monitoring the flow change rate, a threshold is set, i.e., the flow change rate is less than 1%. In the execution process, the control calculates the flow change amount in real time, and compares the latest flow value with the flow value at the previous time through the data acquisition module. If the condition cannot be met within 2 seconds, the control system returns to step S1 to re-evaluate the current working condition to ensure the continuous accuracy of the flow control.

[0076] If the flow change rate continues to be less than 1% and is maintained for more than 2 seconds, it will be determined that the current flow is in a stable state. In this case, the control module maintains the current opening of the first valve 1 and the second valve 2. This design ensures that the flow control system remains stable after reaching its expected flow target.

[0077] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for controlling a two-stage series bypass valve, characterized in that, Includes the following steps; S1. Real-time detection of operating condition parameters, and determination of whether the current operating condition is transient or steady-state based on the operating condition parameters; S2. When it is determined that the transient condition is in effect, the first-stage valve (1) is controlled to the preset transient response opening of 30°, and the second-stage valve (2) is subjected to high-frequency closed-loop regulation to achieve a rapid response to changes. S3 indicates a steady-state condition, and the flow level is further determined, divided into low-flow steady-state condition and medium-high-flow steady-state condition, and coarse adjustment is performed. S4. After completing the initial fixation of the coarse adjustment, read the target flow ratio, calculate the target opening of the second-stage valve (2) according to the proportional control formula, and perform fine adjustment of the second-stage valve (2); S5. After fine-tuning the second-stage valve (2), continuously monitor the flow rate change, determine whether the flow rate change rate is within the range of less than 1% and continue for 2 seconds. If the determination is no, return to step S1. If the determination is yes, it indicates that a stable state has been reached, and maintain the current opening of the first-stage valve (1) and the second-stage valve (2). The target opening degree of the second-stage valve (2) is calculated according to the proportional control formula, and the specific formula is as follows: ; In the formula, Indicates the opening degree of the target butterfly valve; Represents a value related to the input opening. Relevant proportionality coefficients; This indicates the initial opening degree of the butterfly valve; Indicates the target traffic; This represents the actual traffic volume.

2. The two-stage series bypass valve control method according to claim 1, characterized in that, The determination step in step S1 that determines whether the current operating condition is transient or steady-state includes: When the acceleration is greater than 5m / s 2 The condition is judged to be a transient condition. When the acceleration is less than 5 m / s 2 The condition is judged to be a steady-state condition.

3. The two-stage series bypass valve control method according to claim 1, characterized in that, The coarse adjustment determines a preliminary flow range based on the current operating parameters and adjusts the opening of the first-stage valve (1) between 2°, 5°, 10°, 15°, 20° and 30°.

4. The two-stage series bypass valve control method according to claim 1, characterized in that, In step S3, the steady-state condition is divided into low-flow steady-state condition and medium-high-flow steady-state condition based on whether the flow rate is less than 30% of the maximum flow rate. When operating under low flow steady-state conditions, select from the preset range of 2°-10°. When operating under medium to high flow steady-state conditions, select from the preset range of 15°-30°.

5. The two-stage series bypass valve control method according to claim 1, characterized in that, The fine adjustment is based on the fixed opening of the first-stage valve (1), and the target opening of the second-stage valve (2) is calculated to make the opening of the second-stage valve (2) precisely fine-tuned, with an adjustment range of 0°-90°.

6. A two-stage series bypass valve control device, applied to the two-stage series bypass valve control method as described in any one of claims 1-5, characterized in that, include: First-stage valve (1), second-stage valve (2), and bypass pipeline (3); One end of the first-stage valve (1) is connected to one end of the second-stage valve (2) through a bypass pipe (3); The first-stage valve (1) is configured to be selectively fixed among multiple preset discrete opening positions to coarsely adjust the bypass flow rate; The second-stage valve (2) is configured to continuously adjust its opening based on the first-stage valve (1) being fixed at a certain position, so as to finely adjust the bypass flow.

7. A two-stage series bypass valve control device according to claim 6, characterized in that, The first stage valve (1) is a booster bypass valve, and the second stage valve (2) is a butterfly valve.

8. A two-stage series bypass valve control device according to claim 6, characterized in that, The preset opening positions of the first-stage valve (1) include: 2°, 5°, 10°, 15°, 20° and 30°.

9. A two-stage series bypass valve control device according to claim 6, characterized in that, The diameter of the first-stage valve (1) is 16mm or 20mm.

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