Digital valve group-based high-pressure plunger pump flow pulsation active suppression method and system
By combining digital valve groups with high-pressure plunger pumps, an active suppression method is used to synchronously compensate for pump shaft rotation angle and pressure pulsation signals. This solves the system instability problem caused by high-pressure plunger pump flow pulsation, improves operational stability and control accuracy, and extends the life of hydraulic components.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QIDONG HIGH PRESSURE OIL PUMP
- Filing Date
- 2026-04-24
- Publication Date
- 2026-05-29
AI Technical Summary
The flow pulsation generated by the high-pressure plunger pump during operation leads to system instability, affecting the smoothness of the movement of the actuators and the control accuracy, and exacerbating fatigue damage to pipelines, joints, valves and seals. Existing passive suppression methods are difficult to adapt to changes in operating conditions.
By combining digital valve groups with pump shaft rotation signals and pressure pulsation signals, and through the rapid switching and discrete flow adjustment capabilities of digital valve groups, active compensation synchronized with mechanical rotation is achieved, constructing an anti-phase compensation flow and reducing flow pulsation.
It improves the smoothness of hydraulic system operation under different speed, load and pressure conditions, reduces vibration and noise, extends the life of hydraulic components and enhances control accuracy.
Smart Images
Figure CN122106848A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of plunger pumps, specifically relating to a method and system for actively suppressing flow pulsation in high-pressure plunger pumps based on digital valve groups. Background Technology
[0002] High-pressure piston pumps, as core power components in hydraulic systems, are widely used in engineering machinery, metallurgical equipment, aviation hydraulics, marine propulsion, and high-end intelligent manufacturing equipment due to their advantages such as high rated pressure, high volumetric efficiency, high power density, and wide range of applicable operating conditions. In actual operation, the multiple piston chambers of a high-pressure piston pump sequentially complete the oil suction and discharge processes as the pump shaft rotates. Because the discharge sequence of each piston chamber alternates periodically, the instantaneous output flow rate at the pump outlet is usually not ideally constant, but rather exhibits significant flow pulsation within a mechanical cycle. This flow pulsation further couples with the volumetric elasticity of the pipeline, the compressibility of the oil, the dynamic response characteristics of valves, and load-side pressure fluctuations, resulting in problems such as pressure pulsation, increased vibration, and increased noise in the main oil circuit. Especially under high pressure, high speed, and frequent changing operating conditions, the system instability caused by flow pulsation is more pronounced, not only affecting the smoothness of the actuator's movement and control accuracy, but also exacerbating fatigue damage to pipelines, joints, valves, and seals, reducing the overall reliability and service life of the machine.
[0003] To address the flow pulsation problem in high-pressure plunger pumps, existing technologies typically employ passive suppression methods. These include optimizing the distribution plate structure, installing damping grooves, adding accumulators, adjusting pipeline parameters, or configuring throttling damping elements to attenuate the pulsation. While these solutions are relatively simple in structure, they rely heavily on fixed structural parameters to absorb or buffer pulsations under specific operating conditions. Their suppression effectiveness is often limited by factors such as pump speed, pressure, load variations, and the system's natural frequency. When operating conditions change, passive suppression devices typically struggle to adjust the pulsation phase and amplitude in real time, resulting in limited pulsation control capabilities across multiple operating conditions. Furthermore, passive structures generally only mitigate pulsations in certain frequency bands, lacking adaptability to high-frequency pulsations and complex harmonic components. Summary of the Invention
[0004] To address the aforementioned issues, this invention provides a method and system for actively suppressing flow pulsation in high-pressure piston pumps based on digital valve groups. This method leverages the periodic operating characteristics of the high-pressure piston pump, combined with the rapid switching and discrete flow adjustment capabilities of digital valve groups, to actively compensate for flow pulsation in sync with the mechanical rotation angle. This improves the pulsation suppression effect under different speeds, pressures, and loads, thereby enhancing the operational stability and control accuracy of the hydraulic system.
[0005] The technical solution provided by this invention is as follows: A method for actively suppressing flow pulsation in a high-pressure plunger pump based on a digital valve manifold includes the following steps: S1. Collect the pump shaft rotation angle signal of the high-pressure plunger pump and collect the pressure pulsation signal in the main oil circuit of the high-pressure plunger pump; S2. Determine the phase sequence of the original flow pulsation within the current working cycle based on the number of plungers, rotational speed, and pump shaft rotation angle signal of the high-pressure plunger pump. S3. Based on the pressure pulsation signal and the phase sequence, perform harmonic decomposition on the original flow pulsation in the current working cycle to obtain the amplitude parameters and phase parameters of the target compensation flow. S4. Based on the amplitude and phase parameters of the target compensation flow rate, and combined with the discrete flow capability of each high-speed switching valve in the digital valve group, the target compensation flow rate is mapped to a valve group switching control sequence. S5. Control the operation of the digital valve group according to the preset phase advance amount, so that the compensation chamber is connected to or cut off from the main oil circuit, so that part of the working medium in the main oil circuit is introduced into the compensation chamber during the peak flow pulsation range, and the working medium in the compensation chamber is released back to the main oil circuit during the valley flow pulsation range. S6. Based on the residual pressure pulsation of the current working cycle, correct the amplitude parameter, the phase parameter, the phase advance, and the valve group switching control sequence for the next working cycle.
[0006] In some implementations, in step S2, the phase sequence is established according to the pump shaft mechanical rotation period and corresponds one-to-one with the oil discharge sequence of each plunger chamber.
[0007] In some implementations, in step S3, Fourier decomposition is used to perform harmonic decomposition on the original flow pulsation in the current working cycle to obtain the amplitude parameters and phase parameters corresponding to each harmonic, and the target compensation flow is constructed based on the amplitude parameters and phase parameters of each harmonic.
[0008] In some implementations, in step S4, the digital valve group includes multiple high-speed switching valves arranged in parallel, each of the high-speed switching valves having a different effective flow area at its valve port, and the controller outputs on / off commands for each of the high-speed switching valves according to the target compensation flow rate.
[0009] In some embodiments, the effective flow area of each of the high-speed switching valves is configured in a binary weighted manner.
[0010] In some implementations, in step S5, the phase advance is determined based on the response hysteresis of the digital valve group and the propagation delay of the working medium in the main oil circuit.
[0011] In some embodiments, the compensation cavity is a piston-type variable-volume compensation cavity.
[0012] In some implementations, in step S6, the amplitude parameter, the phase parameter, and the phase advance of the next working cycle are corrected in a closed loop based on the residual pressure pulsation amplitude and residual pressure pulsation phase of the current working cycle, and the valve group switching control sequence is updated synchronously.
[0013] On the other hand, the high-pressure plunger pump flow pulsation active suppression system based on digital valve group is characterized by including a high-pressure plunger pump, an angle acquisition device, a pulsation signal acquisition device, a digital valve group, a compensation chamber, and a controller. The rotation angle acquisition device is installed at the pump shaft of the high-pressure plunger pump and is used to acquire the pump shaft rotation angle signal; The pulsation signal acquisition device is installed on the main oil line of the high-pressure plunger pump and is used to acquire pressure pulsation signals. The digital valve group is located between the compensation chamber and the main oil circuit, and the digital valve group includes multiple high-speed switching valves arranged in parallel, each of which has a different effective flow area at its valve port. The controller is electrically connected to the rotation angle acquisition device, the pulsation signal acquisition device, and the digital valve group, respectively. It is used to determine the phase sequence of the original flow pulsation in the current working cycle based on the number of plungers, rotation speed, and pump shaft rotation angle signal of the high-pressure plunger pump. It performs harmonic decomposition on the original flow pulsation in the current working cycle based on the pressure pulsation signal and the phase sequence to obtain the amplitude parameters and phase parameters of the target compensation flow. It generates a valve group switching control sequence based on the amplitude parameters and phase parameters of the target compensation flow and the discrete flow capacity corresponding to each of the high-speed switching valves. The controller is also used to control the operation of the digital valve group according to a preset phase advance, so that the compensation chamber absorbs the working medium in the peak range of flow pulsation and releases the working medium in the valley range of flow pulsation. The controller is also used to correct the amplitude parameter, the phase parameter, the phase advance, and the valve group switching control sequence for the next working cycle based on the residual pressure pulsation of the current working cycle.
[0014] In some embodiments, the compensation chamber is a piston-type variable-capacity compensation chamber, and the effective flow area of the valve port of each high-speed switching valve is configured in a binary weighted manner.
[0015] In summary, the beneficial effects of this invention are: (1) This invention uses the pump shaft rotation angle of the high-pressure plunger pump as the pulsation phase reference, analyzes the original flow pulsation in conjunction with the pressure pulsation signal, and further generates a target compensation flow that is in the opposite phase to the original flow pulsation. Then, the compensation chamber is controlled by a digital valve group to absorb the working medium in the peak range of the flow pulsation and release the working medium in the valley range of the flow pulsation, thereby achieving active suppression of the flow pulsation of the high-pressure plunger pump. Compared with passive suppression methods that rely solely on damping, energy storage, or structural optimization, this invention can directly compensate for the flow pulsation itself, with a more direct suppression path and a more stable pulsation control effect.
[0016] (2) This invention employs a digital valve group composed of multiple high-speed switching valves, and utilizes the discrete flow capability corresponding to each high-speed switching valve to map and control the target compensation flow, resulting in a compensation flow construction with fast response speed, high control accuracy, and suitability for high-pressure conditions. Compared to the continuous regulating valve scheme, this invention is more suitable for achieving rapid compensation in the high-frequency pulsation scenario of high-pressure plunger pumps, which helps to reduce control lag and improve the phase matching accuracy of peak absorption and valley compensation.
[0017] (3) After completing the active compensation for one working cycle, the present invention can also modify the compensation parameters and valve group control sequence for the next working cycle based on the residual pressure pulsation, thereby forming a continuously iterative closed-loop regulation mechanism. Thus, the present invention can not only adapt to the operating changes of high-pressure plunger pumps under different speeds, loads and pressures, but also improve the operating stability of the hydraulic system, reduce vibration and noise, and help extend the service life of pipelines and related hydraulic components. Attached Figure Description
[0018] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation
[0019] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. The following embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.
[0020] This invention provides a high-pressure plunger pump flow pulsation active suppression system based on a digital valve group, comprising a high-pressure plunger pump, an angle acquisition device, a pulsation signal acquisition device, a digital valve group, a compensation chamber, and a controller. The high-pressure plunger pump is used to output high-pressure working medium to the hydraulic actuation circuit. The high-pressure plunger pump can be an axial plunger pump or a radial plunger pump; in this embodiment, a swashplate axial plunger pump is preferred. The angle acquisition device is located at the pump shaft of the high-pressure plunger pump and is used to acquire the pump shaft angle signal in real time. An absolute encoder or a high-resolution incremental encoder is preferred. The pulsation signal acquisition device is located near the outlet of the main oil circuit of the high-pressure plunger pump and is used to acquire the pressure pulsation signal in the main oil circuit. A pressure sensor with a response frequency more than ten times higher than the main pulsation frequency is preferred to ensure that periodic pulsations and high-order harmonic components can be effectively identified. The digital valve group is located between the compensation chamber and the main oil circuit and is used to control the connection state between the compensation chamber and the main oil circuit. The compensation chamber adopts a piston-type variable-volume compensation chamber, which is equipped with a reciprocating compensation piston to form an absorption space when the main oil circuit pressure increases, and to release the previously stored working medium during the trough stage of the main oil circuit flow. The controller is electrically connected to the angle acquisition device, the pulsation signal acquisition device and the digital valve group, respectively, to complete pulsation phase recognition, target compensation flow calculation, valve group control sequence generation and closed-loop correction.
[0021] In this embodiment, the digital valve group includes multiple high-speed switching valves arranged in parallel, each with a different effective flow area at its orifice, forming multiple discrete flow units. To improve the accuracy of the target compensation flow fitting and reduce the complexity of control calculations, the effective flow area at the orifice of each high-speed switching valve is preferably configured in a binary weighted manner. For example, the equivalent flow capacity of the four high-speed switching valves can be set to 1Q, 2Q, 4Q, and 8Q respectively, where Q is the smallest discrete flow unit. The controller implements different on / off combinations for each high-speed switching valve, enabling the digital valve group to output a discrete compensation flow that matches the target compensation flow at any given control moment. Compared with using a single continuous regulating valve, this structure can reduce high-pressure throttling losses while ensuring dynamic response speed, and facilitates rapid compensation under high-frequency pulsation conditions.
[0022] During operation, the high-pressure plunger pump's plunger chambers sequentially pass through the suction and discharge zones as the pump shaft rotates. The instantaneous flow rate within a single working cycle is affected by the number of plungers, pump shaft speed, discharge sequence of each plunger chamber, and instantaneous pressure fluctuations, resulting in periodic flow pulsations and corresponding pressure pulsations in the pump outlet main oil circuit. Therefore, this invention does not employ a simple passive damping method, but instead uses the pump shaft mechanical rotation angle as a reference to perform phase tracking and active phase reversal compensation for the original flow pulsations within a single working cycle.
[0023] Specifically, the controller first obtains the real-time angular displacement signal of the pump shaft through an angle acquisition device, and establishes a phase sequence for the current working cycle according to one mechanical angle cycle. If the number of plungers in the high-pressure plunger pump is z, and the pump shaft angle is θ, then each plunger chamber corresponds to a specific phase window in the oil discharge interval. The controller determines the oil discharge sequence of each plunger chamber in the current cycle based on the number of plungers, the pump shaft speed, and the angle signal, thereby obtaining the phase sequence of the original flow pulsation. The phase sequence corresponds one-to-one with the oil discharge sequence of each plunger chamber, which can characterize the repetitive pattern of the main pulsation within a mechanical cycle, and also provide a unified angular reference for subsequent harmonic decomposition and phase advance compensation.
[0024] After obtaining the phase sequence, the controller, combined with the pressure pulsation signal acquired by the pulsation signal acquisition device, estimates and decomposes the original flow pulsation within the current working cycle. Since there is a correspondence between the pump outlet pressure pulsation and the instantaneous flow pulsation, the original flow pulsation can be reconstructed based on the pressure pulsation signal, system fluid parameters, and the equivalent volume model of the main oil circuit. Then, Fourier decomposition is performed on the reconstructed periodic waveform. Let the original flow pulsation within a single mechanical cycle be expressed as: Where θ is the pump shaft rotation angle, k is the harmonic order, and a_k and b_k are the cosine and sine coefficients of the k-th harmonic component, respectively. The controller further calculates the amplitude parameter A_k and phase parameter φ_k of each harmonic based on the harmonic decomposition results, and uses these to construct the target compensation flow. The principle for constructing the target compensation flow is that it is in opposite phase to the original flow pulsation; that is, when the original flow pulsation tends to its peak value, the target compensation flow corresponds to the absorbed flow; when the original flow pulsation tends to its trough value, the target compensation flow corresponds to the released flow. It can be expressed as: In actual control, to compensate for the response lag of the digital valve group and the propagation delay of the working medium in the main oil circuit, the controller does not trigger the digital valve group at the theoretical peak and trough times, but introduces a preset phase advance Δθ. Therefore, the actual control phase of the digital valve group can be expressed as: Wherein, θ_t is the theoretical compensation trigger phase, and θ_c is the actual control phase. The phase advance Δθ is determined based on the valve response hysteresis of the digital valve group and the propagation delay of the working medium in the main oil circuit. The valve response hysteresis is mainly composed of the electromagnetic drive setup time of the high-speed switching valve, the valve core opening and closing time, and the controller output refresh cycle. The propagation delay mainly depends on the pipeline length, pipe diameter, medium bulk modulus, and system pressure level between the pulsation signal acquisition location and the digital valve group inlet. The controller can pre-calibrate the phase advance through experimental identification during the equipment commissioning phase, or it can perform online iterative correction during operation by combining the residual pulsation amplitude and phase.
[0025] When mapping the target compensation flow rate to executable control commands, the controller discretizes the target compensation flow rate based on the discrete flow capacity of each high-speed switching valve in the digital valve group. Since the effective flow area of each high-speed switching valve is configured using a binary weighted method, any target compensation flow rate value can be decomposed into several combinations of the on / off states of the high-speed switching valves. For example, if the discrete flow capacity of the four high-speed switching valves is 1Q, 2Q, 4Q, and 8Q respectively, and the target compensation flow rate at the current moment corresponds to 11Q, the controller can output that the high-speed switching valves corresponding to 1Q, 2Q, and 8Q are simultaneously turned on, while the high-speed switching valve corresponding to 4Q is turned off, thus forming a discrete compensation flow rate output of 11Q. By dynamically refreshing the on / off combinations of each high-speed switching valve within a continuous control cycle, the digital valve group can approximate the periodic flow waveform required for anti-phase compensation.
[0026] In this embodiment, the compensation chamber is a piston-type variable-volume compensation chamber, which includes a chamber body, a compensation piston, a reset element, and a guide sealing structure. One side of the chamber body is connected to the main oil circuit through a digital valve group. The compensation piston can reciprocate axially within the chamber body. The reset element is preferably a reset spring, used to push the compensation piston to reset when the pressure in the main oil circuit decreases. The guide sealing structure is used to ensure the smoothness and sealing of the compensation piston movement. When the main oil circuit flow pulsation enters the peak range, the controller activates the digital valve group according to a preset phase advance, allowing some of the working medium in the main oil circuit to enter the compensation chamber. This pushes the compensation piston to move in the energy storage direction against the action of the reset element, and the volume of the compensation chamber increases accordingly, completing peak absorption. When the main oil circuit flow pulsation enters the valley range, the controller controls the digital valve group to switch to the release state. Under the action of the reset element, the compensation piston moves in the return direction, pushing the working medium in the compensation chamber back to the main oil circuit, completing valley replenishment. Through this "peak absorption - valley release" process, the original flow peak-valley difference in the main oil circuit is reduced, thereby achieving active suppression of the flow pulsation of the high-pressure plunger pump.
[0027] To improve suppression accuracy, after one working cycle, the controller performs closed-loop correction for residual pressure pulsations. Specifically, the pulsation signal acquisition device collects the residual pressure pulsation signal after the end of the current working cycle. The controller compares the residual pressure pulsation amplitude and phase with the target compensation flow parameter for the current cycle, calculates the amplitude error and phase error, and corrects the amplitude parameter, phase parameter, phase advance, and valve group switching control sequence for the next working cycle accordingly. If the residual pressure pulsation amplitude is too large, it indicates that the compensation flow amplitude for the current cycle is insufficient, so the controller increases the amplitude parameter of the target compensation flow. If the peak value of the residual pressure pulsation still lags behind the theoretical position, it indicates that the phase advance setting is insufficient, so the controller increases the phase advance accordingly. If the residual pressure pulsation is more pronounced at certain harmonic orders, the controller makes targeted corrections to the amplitude and phase parameters of the corresponding harmonic components. Through the above closed-loop correction, the system can gradually approach the optimal compensation state, improving the pulsation suppression stability under different speeds, loads, and pressure conditions.
[0028] As a specific embodiment, the high-pressure plunger pump is a nine-plunger swashplate axial plunger pump with a rated working pressure of 31.5 MPa and a rated speed of 1500 r / min. The digital valve group includes four high-speed switching valves, whose discrete flow capacity is configured in a binary weighted manner, corresponding to 1Q, 2Q, 4Q, and 8Q respectively. The rotation angle acquisition device is an incremental encoder with a resolution of not less than 2048 pulses / revolution, and the pulsation signal acquisition device is a pressure sensor with a bandwidth of not less than 5 kHz. The controller performs discrete sampling of the rotation angle interval at a fixed angular resolution within each mechanical cycle. For example, a mechanical cycle can be divided into 360 angular sampling points, each sampling point corresponding to a compensation flow control moment. The controller calculates the target compensation flow corresponding to each sampling point based on the phase sequence and pressure pulsation signal of the current cycle, and converts the target compensation flow into a switching combination command for the four high-speed switching valves. By continuously executing multiple mechanical cycles, the first-order pulsation and higher harmonic pulsation in the main oil circuit at the pump outlet can be significantly reduced.
[0029] As another more specific control implementation, during the initial system operation phase, the controller first performs an open-loop identification process. The controller reads the number and rotational speed of the high-pressure plunger pump and records pressure pulsation signals over several consecutive mechanical cycles, extracting the dominant frequency and main harmonic components of the original flow pulsation to establish an initial pulsation model. Subsequently, the controller generates the first set of target compensation flow rates according to this initial pulsation model and drives the digital valve group to operate under a preset phase advance. After the system enters a stable state, the controller then uses the acquired residual pressure pulsation signals to perform closed-loop correction. In this way, the system first achieves rapid establishment of compensation capability through an open-loop model, and then gradually optimizes the compensation parameters through closed-loop feedback, thereby balancing initial response speed and steady-state suppression accuracy.
[0030] In this invention, the digital valve assembly is preferably positioned near the outlet of the high-pressure plunger pump to shorten the branch length from the main oil circuit to the compensation chamber, reducing fluid propagation delay and the impact of additional volume. The pulsation signal acquisition device is preferably located on the side of the main oil circuit near the pump outlet to reflect the original pulsation characteristics at the pump source as accurately as possible. The effective volume of the compensation chamber, the diameter and stroke of the compensation piston can be matched and designed according to the pump displacement, rated speed, target pulsation suppression range, and allowable additional space. Generally, under conditions with large pulsation amplitude, the effective volume of the compensation chamber and the total flow capacity of the digital valve assembly can be increased to improve peak absorption and valley release capabilities; under high-frequency conditions, the response frequency of the high-speed switching valve and the refresh rate of the controller can be prioritized to ensure phase synchronization accuracy.
[0031] To ensure system reliability, the high-speed switching valve preferably adopts a high-pressure resistant structure. The valve seat and valve core materials can be high-strength alloy steel or surface-hardened materials to adapt to frequent high-pressure opening and closing conditions. Low-friction seals are preferably used between the compensation piston and the cavity to reduce mechanical hysteresis. The controller can employ a real-time control unit with high-speed sampling and parallel processing capabilities, such as an industrial-grade DSP, FPGA, or high-speed microcontroller, to meet the real-time requirements of angle synchronization, harmonic decomposition, discrete mapping, and closed-loop correction.
[0032] The working principle of this invention can be summarized as follows: using the pump shaft rotation angle as the periodic reference for flow pulsation, the pulsation phase is obtained through the rotation angle acquisition device, and the pressure pulsation information is obtained through the pulsation signal acquisition device. Within the current mechanical cycle, the controller performs harmonic decomposition on the original flow pulsation and constructs an inverse target compensation flow. Then, combined with the discrete flow capability of the digital valve group, a valve group switching control sequence is generated. Under the condition of considering the phase advance, the digital valve group is controlled so that the compensation chamber absorbs the working medium in the peak range and releases the working medium in the valley range, thus actively suppressing the flow pulsation in the main oil circuit of the high-pressure plunger pump. Subsequently, the residual pressure pulsation is used to correct the compensation parameters for the next cycle to form a continuously iterative and optimized closed-loop control process.
[0033] Compared to passive suppression methods that rely solely on damping orifices, accumulators, or valve plate structure optimization, this invention combines the periodic characteristics of pump source pulsation with the high-speed discrete flow regulation capability of digital valve groups. Instead of simply responding with a lag after pulsation occurs, it pre-constructs an anti-phase compensation flow rate based on rotational synchronization, ensuring that the compensation process corresponds to the original pulsation in phase and cancels it out in flow rate. Especially in the multi-condition operation scenarios of high-pressure plunger pumps, this invention continuously corrects the compensation amplitude and phase through a closed-loop correction mechanism, maintaining good pulsation suppression capability under changes in pump speed, load, and oil parameters.
[0034] The above description is only a preferred embodiment of the present invention. Those skilled in the art, inspired by the technical concept of the present invention, may make various adjustments and substitutions to the yarn material, weaving structure, cross angle, anchoring method, heat treatment conditions and coating structure, and all such adjustments and substitutions should be considered to fall within the protection scope of the present invention.
Claims
1. A method for actively suppressing flow pulsation in a high-pressure plunger pump based on a digital valve group, characterized in that, Includes the following steps: S1. Collect the pump shaft rotation angle signal of the high-pressure plunger pump and collect the pressure pulsation signal in the main oil circuit of the high-pressure plunger pump; S2. Determine the phase sequence of the original flow pulsation within the current working cycle based on the number of plungers, rotational speed, and pump shaft rotation angle signal of the high-pressure plunger pump. S3. Based on the pressure pulsation signal and the phase sequence, perform harmonic decomposition on the original flow pulsation in the current working cycle to obtain the amplitude parameters and phase parameters of the target compensation flow. S4. Based on the amplitude and phase parameters of the target compensation flow rate, and combined with the discrete flow capability of each high-speed switching valve in the digital valve group, the target compensation flow rate is mapped to a valve group switching control sequence. S5. Control the operation of the digital valve group according to the preset phase advance amount, so that the compensation chamber is connected to or cut off from the main oil circuit, so that part of the working medium in the main oil circuit is introduced into the compensation chamber during the peak flow pulsation range, and the working medium in the compensation chamber is released back to the main oil circuit during the valley flow pulsation range. S6. Based on the residual pressure pulsation of the current working cycle, correct the amplitude parameter, the phase parameter, the phase advance, and the valve group switching control sequence for the next working cycle.
2. The method for actively suppressing flow pulsation in a high-pressure plunger pump based on a digital valve group according to claim 1, characterized in that, In step S2, the phase sequence is established according to the pump shaft mechanical rotation period and corresponds one-to-one with the oil discharge sequence of each plunger chamber.
3. The method for actively suppressing flow pulsation in a high-pressure plunger pump based on a digital valve group according to claim 1, characterized in that, In step S3, Fourier decomposition is used to perform harmonic decomposition on the original flow pulsation in the current working cycle to obtain the amplitude parameters and phase parameters corresponding to each harmonic, and the target compensation flow is constructed based on the amplitude parameters and phase parameters of each harmonic.
4. The method for actively suppressing flow pulsation in a high-pressure plunger pump based on a digital valve group according to claim 1, characterized in that, In step S4, the digital valve group includes multiple high-speed switching valves arranged in parallel, each of which has a different effective flow area at its valve port. The controller outputs on / off commands for each of the high-speed switching valves according to the target compensation flow rate.
5. The method for actively suppressing flow pulsation in a high-pressure plunger pump based on a digital valve group according to claim 4, characterized in that, The effective flow area of the valve port of each of the high-speed switching valves is configured in a binary weighted manner.
6. The method for actively suppressing flow pulsation in a high-pressure plunger pump based on a digital valve group according to claim 1, characterized in that, In step S5, the phase advance is determined based on the response hysteresis of the digital valve group and the propagation delay of the working medium in the main oil circuit.
7. The method for actively suppressing flow pulsation in a high-pressure plunger pump based on a digital valve group according to claim 1, characterized in that, The compensation chamber is a piston-type variable-capacity compensation chamber.
8. The method for actively suppressing flow pulsation in a high-pressure plunger pump based on a digital valve group according to claim 1, characterized in that, In step S6, based on the residual pressure pulsation amplitude and residual pressure pulsation phase of the current working cycle, the amplitude parameter, the phase parameter, and the phase advance amount for the next working cycle are corrected in a closed loop, and the valve group switching control sequence is updated synchronously.
9. A high-pressure plunger pump flow pulsation active suppression system based on digital valve groups, characterized in that, It includes a high-pressure plunger pump, an angle acquisition device, a pulse signal acquisition device, a digital valve group, a compensation chamber, and a controller; The rotation angle acquisition device is installed at the pump shaft of the high-pressure plunger pump and is used to acquire the pump shaft rotation angle signal; The pulsation signal acquisition device is installed on the main oil line of the high-pressure plunger pump and is used to acquire pressure pulsation signals. The digital valve group is located between the compensation chamber and the main oil circuit, and the digital valve group includes multiple high-speed switching valves arranged in parallel, each of which has a different effective flow area at its valve port. The controller is electrically connected to the rotation angle acquisition device, the pulsation signal acquisition device, and the digital valve group, respectively. It is used to determine the phase sequence of the original flow pulsation in the current working cycle based on the number of plungers, rotation speed, and pump shaft rotation angle signal of the high-pressure plunger pump. It performs harmonic decomposition on the original flow pulsation in the current working cycle based on the pressure pulsation signal and the phase sequence to obtain the amplitude parameters and phase parameters of the target compensation flow. It generates a valve group switching control sequence based on the amplitude parameters and phase parameters of the target compensation flow and the discrete flow capacity corresponding to each of the high-speed switching valves. The controller is also used to control the operation of the digital valve group according to a preset phase advance, so that the compensation chamber absorbs the working medium in the peak range of flow pulsation and releases the working medium in the valley range of flow pulsation. The controller is also used to correct the amplitude parameter, the phase parameter, the phase advance, and the valve group switching control sequence for the next working cycle based on the residual pressure pulsation of the current working cycle.
10. The high-pressure plunger pump flow pulsation active suppression system based on digital valve groups according to claim 9, characterized in that, The compensation chamber is a piston-type variable-capacity compensation chamber, and the effective flow area of the valve port of each high-speed switching valve is configured in a binary weighted manner.