A digital pump flow distribution system and adaptive control method

Abstract

The present invention discloses a digital pump flow distribution system and an adaptive control method, which relates to the technical field of hydraulic equipment, including: a low-pressure oil circuit and a valve controller; a low-pressure oil circuit pressure sensor, whose input end is connected to the low-pressure oil circuit, and whose output end is electrically connected to the valve controller; an eccentric wheel, which is arranged inside the digital pump through the rotation of a rotating shaft; an angle sensor, whose input end is connected to the rotating shaft, and whose output end is electrically connected to the valve controller; a plurality of plungers, which are arranged on the outer side of the eccentric wheel for sliding along the circumferential direction; a flow distribution valve, whose input end is connected to the low-pressure oil circuit, and whose output end is connected to the corresponding plunger; a plunger cavity pressure sensor, whose input end is connected to the flow distribution valve outlet oil circuit, and whose output end is electrically connected to the valve controller; and a plurality of flow distribution valves are all electrically connected to the valve controller. The present invention processes the information data of the plunger cavity pressure sensor, the low-pressure oil circuit pressure sensor and the angle sensor, maintains the actual response of the flow distribution valve to match the plunger stroke, and realizes the adaptive control of the flow distribution of the digital pump.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment, and in particular to a digital pump flow distribution system and an adaptive control method. Background Art

[0002] With the rapid development of digital pump technology, perfect flow distribution is extremely important and indispensable for digital pumps. However, in actual working conditions, due to factors such as fluctuations in the speed of the drive motor and changes in the dynamic response characteristics of the flow distribution valve, the actual response of the flow distribution valve does not match the plunger stroke, which reduces the volumetric efficiency of the hydraulic system and causes flow backflow. Summary of the invention

[0003] The embodiments of the present invention provide a digital pump flow distribution system and an adaptive control method, which can solve the problem of mismatch between the actual response of the flow distribution valve and the plunger stroke caused by factors such as fluctuations in the speed of the driving motor and changes in the dynamic response characteristics of the flow distribution valve, thereby reducing the volumetric efficiency of the hydraulic system and causing flow backflow.

[0004] The present invention provides a digital pump flow distribution system and an adaptive control method, comprising the following steps:

[0005] Low pressure oil circuit and valve controller;

[0006] A low-pressure oil circuit pressure sensor, whose input end is connected to the low-pressure oil circuit and whose output end is electrically connected to the input end of the valve controller;

[0007] The eccentric wheel is arranged inside the digital pump through the rotation of the shaft;

[0008] A rotation angle sensor, whose input end is connected to the rotating shaft and whose output end is electrically connected to the input end of the valve controller;

[0009] A plurality of plungers, each having a cavity inside, and slidably arranged on the outside of the eccentric wheel in the circumferential direction;

[0010] A plurality of cylinder assemblies, each of the cylinder assemblies comprising:

[0011] A flow distribution valve, the input end of which is connected to the low-pressure oil circuit, and the output end of which is connected to the corresponding plunger;

[0012] A plunger cavity pressure sensor, the input end of which is connected to the outlet oil circuit of the distribution valve, and the output end of which is electrically connected to the input end of the valve controller;

[0013] The plurality of flow distribution valves are all electrically connected to the output end of the valve controller.

[0014] Preferably, it also includes:

[0015] High pressure oil circuit;

[0016] A plurality of return springs are respectively sleeved on the outer sides of the plurality of plungers;

[0017] A relief valve connected to the high-pressure oil circuit;

[0018] The oil tank is connected to the high-pressure oil circuit.

[0019] Preferably, each of the cylinder assemblies further comprises:

[0020] Cylinder body, the outer ends of the plurality of plungers respectively extend into the interior of the plurality of cylinder bodies;

[0021] An anti-cavitation check valve, the input end of which is connected to the low-pressure oil circuit, and the output end of which is connected to the plunger;

[0022] The oil discharge one-way valve has an input end connected to the plunger and an output end connected to the high-pressure oil circuit.

[0023] An adaptive control method for a digital pump flow distribution system comprises the following steps:

[0024] Set four predetermined rotation angles α 1 , α 2 , α 3 and α 4 As the detection point, set the pressure difference range P corresponding to the four detection points at the same time TH1 , P TH2 , P TH3 and P TH4 ;

[0025] The rotation angle of the rotating shaft is monitored by the rotation angle sensor. When the rotation angle of the rotating shaft reaches a predetermined rotation angle, the valve controller obtains the pressure data of the plunger cavity pressure sensor and the low-pressure oil circuit pressure sensor at the current detection point, and calculates the pressure difference between the two.

[0026] Compare the pressure difference with the pressure difference domain value of the current detection point to determine whether the distribution valve is opening or closing too early, opening or closing normally, or opening or closing too late;

[0027] According to different opening and closing defects, the valve controller sends corresponding compensation instructions for compensation correction to maintain the actual response of the distribution valve matching the plunger stroke.

[0028] Preferably, the four predetermined rotation angles α 1 , α 2 , α 3 and α 4 The value range of is: 1 <α 开启 <α 2 , α 3 <α 关闭 <α 4 ;

[0029] in,

[0030] α开启 =α 原固定开启 +δ 开

[0031] α 关闭 =α 原固定关闭 +δ 关

[0032] In the formula, δ 开 , δ 关 is adaptive compensation, α 原固定开启 , α 原固定关闭 It is the set fixed opening and closing angle.

[0033] Preferably, when the anti-cavitation one-way valve and the flow distribution valve are working simultaneously, the pressure in the plunger cavity will be higher than when only the anti-cavitation one-way valve is working.

[0034] Preferably, the pressure difference is compared with the pressure difference threshold value of the current detection point to determine whether the distribution valve is opened or closed too early, opened or closed normally, or opened or closed too late, specifically including the following situations:

[0035] When the plunger of the digital pump changes from the oil pressure state to the oil suction state:

[0036] The rotation angle of the shaft reaches the predetermined rotation angle α 1 , execute the premature opening judgment, and set the pressure difference P between the plunger cavity pressure sensor and the low pressure oil circuit pressure sensor 1 With the domain value P TH1 For comparison, if the pressure difference P 1 Below the threshold P TH1 , it is judged to be opened too early; if the pressure difference P 1 Greater than the threshold value P TH1 , it is judged to be opened normally;

[0037] The axis angle reaches α 开启 , the valve controller outputs an opening signal;

[0038] The rotation angle of the shaft reaches the predetermined rotation angle α 2 , execute the judgment of opening too late, and set the pressure difference P between the plunger cavity pressure sensor and the low pressure oil circuit pressure sensor 2 With the domain value P TH2 For comparison, if the pressure difference P 2 Below the threshold P TH2 , it is judged to be opened too late; if the pressure difference P 2 Greater than the threshold value P TH2 , it is judged to be turned on normally and no operation is performed.

[0039] Preferably, the pressure difference is compared with the pressure difference domain value of the current detection point to judge whether the distribution valve is opened or closed too early, opened or closed normally, or opened or closed too late, and also includes the following situations:

[0040] When the plunger of the digital pump changes from the oil suction state to the oil pressure state:

[0041] The rotation angle of the shaft reaches the predetermined rotation angle α 3 , execute premature closing judgment, and set the pressure difference P between the plunger cavity pressure sensor and the low pressure oil circuit pressure sensor 3 With the domain value P TH3 For comparison, if the pressure difference P 3 Below the threshold P TH3 , it is judged to be closed too early; if the pressure difference P 3 Greater than the threshold value P TH3 , it is judged to be closed normally;

[0042] The axis angle reaches α 关闭 , the valve controller outputs a closing signal;

[0043] The rotation angle of the shaft reaches the predetermined rotation angle α 4 , execute the judgment of closing too late, and set the pressure difference P between the plunger cavity pressure sensor and the low pressure oil circuit pressure sensor 4 With the domain value P TH4 For comparison, if the pressure difference P 4 Below the threshold P TH4 , it is judged to be closed too late; if the pressure difference P 4 Greater than the threshold P TH4 , it is judged to be closed normally.

[0044] Preferably, according to different opening and closing defects, the valve controller sends corresponding compensation instructions for compensation correction, specifically including the following situations:

[0045] When it is judged to be opened too early, a reduction compensation amount δ is executed 开 The program will keep the changed value as the compensation value for the next start judgment;

[0046] When it is judged to be turned on too late, an increase in compensation amount δ is executed 开 The program will keep the changed value as the compensation value for the next start judgment;

[0047] When it is judged to be closed too early, a reduction compensation amount δ is executed 关 The program will keep the changed value as the compensation amount for the next shutdown judgment;

[0048] When it is judged that the closing is too late, an increase in compensation amount δ is executed 关 The program will keep the changed value as the compensation amount for the next shutdown judgment.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The present invention proposes a digital pump flow distribution system and adaptive control method, which processes the information data of the plunger cavity pressure sensor, the low-pressure oil circuit pressure sensor and the angle sensor, determines whether the flow distribution valve is opened or closed too early or too late, sends a compensation instruction through the valve controller, maintains the actual response of the flow distribution valve to match the plunger stroke, and realizes the digital pump flow distribution adaptive control. It solves the problem of the actual opening and closing of the flow distribution valve and the plunger stroke mismatch caused by factors such as the fluctuation of the driving motor speed and the change of the dynamic response characteristics of the flow distribution valve, improves the efficiency of the digital pump, eliminates the backflow of the flow, and improves the volumetric efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0052] Figure 1 A digital pump flow distribution system diagram of the present invention;

[0053] Figure 2 It is a flow chart of an adaptive control method of a digital pump flow distribution system of the present invention;

[0054] Figure 3 The compensation amount δ is the amount of compensation when the speed of the driving motor of the present invention fluctuates. 开 Change graph;

[0055] Figure 4 The compensation amount δ is closed when the speed of the driving motor of the present invention fluctuates 关 Change graph;

[0056] Figure 5 This is a flow curve diagram when the speed of the drive motor fluctuates after optimization of the present invention.

[0057] In the figure: 1.1-cylinder body, 1.2-plunger, 1.3-eccentric wheel, 1.4-rotating shaft, 1.5-low-pressure oil circuit, 1.6-high-pressure oil circuit, 2.1-anti-cavitation check valve, 2.2-distribution valve, 2.3-oil discharge check valve, 3.1-valve controller, 3.2-low-pressure circuit pressure sensor, 3.3-plunger cavity pressure sensor, 3.4-shaft angle sensor, 4.1-overflow valve, 4.2-oil tank. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] Reference Figure 1 The present invention provides a digital pump flow distribution system, including multiple plungers 1.2, an eccentric wheel 1.3, a low-pressure oil circuit 1.5, a high-pressure oil circuit 1.6, a valve controller 3.1, multiple cylinder assemblies, a low-pressure oil circuit pressure sensor 3.2, an angle sensor 3.4, a relief valve 4.4 and an oil tank 4.1. The low-pressure oil circuit 1.5 and the high-pressure oil circuit 1.6 are both arranged inside the digital pump. Multiple plungers 1.2 are circumferentially slidably arranged on the outside of the eccentric wheel 1.3, and a cavity is opened inside each plunger 1.2. The eccentric wheel 1.3 is arranged inside the digital pump through the rotation shaft 1.4, and drives the multiple plungers 1.2 to reciprocate.

[0060] The low-pressure oil circuit 1.5 is responsible for circulating the low-pressure oil related to the oil tank 4.2, and the high-pressure oil circuit 1.6 is used to circulate the high-pressure oil acting on the load. The overflow valve 4.1 is used to simulate the load, and the oil tank 4.2 is used to store the oil, dissipate heat, precipitate pollutants in the oil, and separate bubbles in the oil.

[0061] The motor controls the rotation of the shaft 1.4 through the coupling.

[0062] Each cylinder assembly includes a cylinder 1.1, an anti-cavitation check valve 2.1, a flow distribution valve 2.2, an oil discharge check valve 2.3 and a plurality of plunger chamber pressure sensors 3.3. The outer ends of the plurality of plungers 1.2 extend into the corresponding cylinder 1.1, and a return spring is provided on the outer side. The input end of the anti-cavitation check valve 2.1 is connected to the low-pressure oil circuit 1.5, and the output end is connected to the plunger 1.2. The anti-cavitation check valve 2.1 is used for oil replenishment. The input end of the flow distribution valve 2.2 is connected to the low-pressure oil circuit 1.5, and the output end is connected to the plunger 1.2. The flow distribution valve 2.2 is used for flow distribution. The input end of the oil discharge check valve 2.3 is connected to the plunger 1.2, and the output end is connected to the high-pressure oil circuit 1.6. The oil discharge check valve 2.3 is used to control the on-off of the high-pressure oil circuit 1.6.

[0063] In this embodiment, the plurality of flow distribution valves 2.2 are all electrically connected to the output end of the valve controller 3.4.

[0064] The input end of the low-pressure oil circuit pressure sensor 3.2 is connected to the low-pressure oil circuit 1.5, and the output end is electrically connected to the input end of the valve controller 3.1. The low-pressure oil circuit pressure sensor 3.2 is used to measure the pressure value of the system low-pressure oil circuit 1.5. The input ends of multiple plunger cavity pressure sensors 3.3 are respectively connected to the outlet oil circuits of multiple distribution valves 2.2, and the output ends are electrically connected to the input end of the valve controller 3.3. The plunger cavity pressure sensor 3.3 is used to measure the plunger cavity pressure value. The input end of the angle sensor 3.4 is connected to the shaft 1.4, and the output end is electrically connected to the input end of the valve controller 3.1. The angle sensor 3.4 is used to measure the angle value of the shaft 1.4.

[0065] Reference Figure 2 Based on the above-mentioned digital pump flow distribution system, the present invention also provides an adaptive control method for the digital pump flow distribution system, which specifically includes the following steps:

[0066] Step 1: Set four predetermined rotation angles α 1 , α 2 , α 3 and α 4 As the detection point, set the pressure difference range P corresponding to the four detection points at the same time TH1 , P TH2 , P TH3 and P TH4 . Domain value P TH1 , P TH2 , P TH3 and P TH4 The value of is determined by the hydraulic system pressure.

[0067] Four predetermined rotation angles α 1 , α 2 , α 3 and α 4 The value range of is: 1 <α 开启 <α 2 , α 3 <α 关闭 <α 4 ;

[0068] in

[0069] α 开启 =α 原固定开启 +δ 开

[0070] α 关闭 =α 原固定关闭 +δ 关

[0071] In the formula, δ 开 , δ 关 is adaptive compensation, α 原固定开启 , α原固定关闭 It is the set fixed opening and closing angle.

[0072] Step 2: Monitor the rotation angle of the shaft 1.4 through the rotation angle sensor 3.4. When the rotation angle of the shaft 1.4 reaches a predetermined rotation angle, the valve controller 3.1 obtains the pressure data of the plunger cavity pressure sensor 3.3 and the low-pressure oil circuit pressure sensor 3.2 at the current detection point, and calculates the pressure difference between the two.

[0073] Step 3: Compare the pressure difference with the pressure difference domain value of the current detection point to determine whether the distribution valve 2.2 is opened or closed too early, opened or closed normally, or opened or closed too late. Specifically, the following situations are included:

[0074] a. When the plunger 1.2 of the digital pump changes from the oil pressure state to the oil suction state:

[0075] (1) The rotation angle of the rotating shaft 1.4 reaches the predetermined rotation angle α 1 , execute the premature opening judgment, and set the pressure difference P between the plunger cavity pressure sensor 3.3 and the low pressure oil circuit pressure sensor 3.2 1 With the domain value P TH1 For comparison, if the pressure difference P 1 Below the threshold P TH1 , it is judged to be opened too early. If the pressure difference P 1 Greater than the threshold value P TH1 , it is judged to be enabled normally.

[0076] (2) The axis turns 1.4 degrees to reach α 开启 , the valve controller 3.1 outputs an opening signal.

[0077] (3) The rotation angle of the rotating shaft 1.4 reaches the predetermined rotation angle α 2 , execute the judgment of opening too late, and calculate the pressure difference P between the plunger cavity pressure sensor 3.3 and the low pressure oil circuit pressure sensor 3.2 2 With the domain value P TH2 For comparison, if the pressure difference P 2 Below the threshold P TH2 , it is judged to be opened too late. If the pressure difference P 2 Greater than the threshold value P TH2 , it is judged to be turned on normally and no operation is performed.

[0078] b. When the plunger 1.2 of the digital pump changes from the oil suction state to the oil pressure state:

[0079] (1) The rotation angle of the rotating shaft 1.4 reaches the predetermined rotation angle α 3 , execute premature closing judgment, and set the pressure difference P between the plunger cavity pressure sensor 3.3 and the low pressure oil circuit pressure sensor 3.2 3 With the domain value P TH3 For comparison, if the pressure difference P3 Below the threshold P TH3 , it is judged to be closed too early. If the pressure difference P 3 Greater than the threshold value P TH3 , it is judged to be closed normally.

[0080] (2) The axis turns 1.4 degrees to reach α 关闭 , the valve controller 3.1 outputs a closing signal.

[0081] (3) The rotation angle of the rotating shaft 1.4 reaches the predetermined rotation angle α 4 , execute the judgment of closing too late, and set the pressure difference P between the plunger cavity pressure sensor 3.3 and the low pressure oil circuit pressure sensor 3.2 4 With the domain value P TH4 For comparison, if the pressure difference P 4 Below the threshold P TH4 , it is judged to be closed too late; if the pressure difference P 2 Greater than the threshold value P TH2 , it is judged to be closed normally.

[0082] Step 4: According to different opening and closing defects, the valve controller 3.1 sends corresponding compensation instructions to make compensation corrections to maintain the actual response of the distribution valve 2.2 matching the stroke of the plunger 1.2. Specifically, it includes the following situations:

[0083] When it is judged to be opened too early, a reduction compensation amount δ is executed 开 The program will keep the changed value as the compensation amount for the next start judgment.

[0084] When it is judged to be turned on too late, an increase in compensation amount δ is executed 开 The program will keep the changed value as the compensation amount for the next start judgment.

[0085] When it is judged to be closed too early, a reduction compensation amount δ is executed 关 The program will keep the changed value as the compensation amount for the next shutdown judgment.

[0086] When it is judged that the closing is too late, an increase in compensation amount δ is executed 关 The program will keep the changed value as the compensation amount for the next shutdown judgment.

[0087] Reference Figure 3 Based on the above-mentioned adaptive control method of a digital pump flow distribution system, when the motor speed fluctuates, the compensation amount δ 开 , the specific changes include the following steps:

[0088] When the motor speed increases, the motor rotation cycle becomes shorter, and the system will judge that it is turned on too late. The compensation amount used in the last turn-on will no longer meet the current distribution requirements. The compensation amount δ 开 Increase gradually with minimum resolution until the pressure difference threshold requirement is met;

[0089] When the motor speed decreases, the motor rotation cycle becomes longer, and the system will judge that it is turned on too early. The compensation amount used in the last turn-on will no longer meet the current distribution requirements. The compensation amount δ 开 Gradually reduce it with minimum resolution until the pressure difference threshold requirement is met.

[0090] Reference Figure 4 Based on the above-mentioned adaptive control method of a digital pump flow distribution system, when the motor speed fluctuates, the closing compensation amount δ 关 , the specific changes include the following steps:

[0091] When the motor speed increases, the motor rotation cycle becomes shorter, and the system will judge that the shutdown is too late. The compensation amount used in the last shutdown will no longer meet the current distribution requirements. The compensation amount δ 关 Increase gradually with minimum resolution until the pressure difference threshold requirement is met;

[0092] When the motor speed decreases, the motor rotation cycle becomes longer, and the system will judge that the shutdown is too early. The compensation amount used in the last shutdown will no longer meet the current distribution requirements. The compensation amount δ 关 Gradually reduce it with minimum resolution until the pressure difference threshold requirement is met.

[0093] Reference Figure 5 Based on the above-mentioned adaptive control method of a digital pump flow distribution system, when the motor speed fluctuates, the specific change of the output flow of the flow distribution valve 2.2 includes the following steps:

[0094] When the motor speed increases, the motor rotation cycle becomes shorter. When the plunger 1.2 changes from the oil suction state to the oil pressure state, at the initial moment, the high-pressure oil in the plunger chamber enters the low-pressure oil circuit 1.5 due to the late closing of the distribution valve 2.2, resulting in flow backflow. After adaptive control, the flow backflow peak gradually decreases, eliminating the flow backflow.

[0095] When the motor speed decreases, the motor rotation cycle becomes longer. When the plunger 1.2 of the digital pump changes from the oil pressure state to the oil suction state, at the initial moment, due to the early opening of the distribution valve 2.2, the high-pressure oil in the plunger cavity enters the low-pressure oil circuit 1.5, resulting in flow backflow. After adaptive control, the flow backflow peak gradually decreases, eliminating the flow backflow.

[0096] As described above, the digital pump distribution system and adaptive control method disclosed in the present invention can perform compensation correction based on the plunger chamber pressure and the pressure difference between the inlet and outlet of the distribution valve, thereby eliminating the mismatch between the actual response of the distribution valve and the plunger stroke caused by factors such as fluctuations in the drive motor speed and changes in the dynamic response characteristics of the distribution valve, thereby improving the volumetric efficiency of the hydraulic system, eliminating flow backflow, and having strong practicality.

[0097] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0098] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An adaptive control method for a digital pump flow distribution system, It is characterized in that The digital pump flow distribution system comprises: Low pressure oil circuit (1.5) and valve controller (3.1); A low-pressure oil circuit pressure sensor (3.2), whose input end is connected to the low-pressure oil circuit (1.5) and whose output end is electrically connected to the input end of the valve controller (3.1); The eccentric wheel (1.3) is rotatably arranged inside the digital pump via the rotating shaft (1.4); A rotation angle sensor (3.4), whose input end is connected to the rotating shaft (1.4) and whose output end is electrically connected to the input end of the valve controller (3.1); A plurality of plungers (1.2) are provided with cavities inside and are slidably arranged on the outside of the eccentric wheel (1.3) in the circumferential direction; A plurality of cylinder assemblies, each of the cylinder assemblies comprising: A flow distribution valve (2.2), whose input end is connected to the low-pressure oil circuit (1.5) and whose output end is connected to the corresponding plunger (1.2); A plunger cavity pressure sensor (3.3), whose input end is connected to the outlet oil circuit of the distribution valve (2.2), and whose output end is electrically connected to the input end of the valve controller (3.1); The plurality of flow distribution valves (2.2) are all electrically connected to the output end of the valve controller (3.1); The adaptive control method comprises the following steps: Set four predetermined rotation angles α 1 , α 2 , α 3 and α 4 As the detection point, set the pressure difference range P corresponding to the four detection points at the same time TH1 , P TH2 , P TH3 and P TH4 ; The rotation angle of the rotating shaft (1.4) is monitored by the rotation angle sensor (3.4); when the rotation angle of the rotating shaft (1.4) reaches a predetermined rotation angle, the valve controller (3.1) obtains the pressure data of the plunger cavity pressure sensor (3.3) and the low-pressure oil circuit pressure sensor (3.2) at the current detection point, and calculates the pressure difference between the two; Compare the pressure difference with the pressure difference range value of the current detection point to determine whether the distribution valve (2.2) is opened or closed too early, opened or closed normally, or opened or closed too late; According to different opening and closing defects, the valve controller (3.1) sends corresponding compensation instructions to perform compensation correction, so as to maintain the actual response of the distribution valve (2.2) matching the stroke of the plunger (1.2).

2. The adaptive control method of a digital pump flow distribution system according to claim 1, It is characterized in that The digital pump flow distribution system also includes: High pressure oil circuit (1.6); A plurality of return springs are respectively sleeved on the outsides of the plurality of plungers (1.2); A relief valve (4.1) is connected to the high-pressure oil circuit (1.6); The oil tank (4.2) is connected to the high-pressure oil circuit (1.6).

3. The adaptive control method of a digital pump flow distribution system according to claim 2, It is characterized in that Each of the cylinder assemblies further comprises: Cylinder body (1.1), the outer ends of the plurality of plungers (1.2) respectively extending into the interior of the plurality of cylinder bodies (1.1); An anti-cavitation check valve (2.1), whose input end is connected to the low-pressure oil circuit (1.5) and whose output end is connected to the plunger (1.2); The oil discharge check valve (2.3) has an input end connected to the plunger (1.2) and an output end connected to the high-pressure oil circuit (1.6).

4. The adaptive control method of a digital pump flow distribution system according to claim 1, It is characterized in that Four predetermined rotation angles α 1 , α 2 , α 3 and α 4 The value range of is: 1 <α 开启 <α 2 , α 3 <α 关闭 <α4; in, a 开启 =a 原固定开启 +d 开 a 关闭 =a 原固定关闭 +d 关 In the formula, δ 开 , δ 关 is adaptive compensation, α 原固定开启 , α 原固定关闭 It is the set fixed opening and closing angle.

5. The adaptive control method of a digital pump flow distribution system as claimed in claim 4, It is characterized in that Compare the pressure difference with the pressure difference threshold value of the current detection point to determine whether the distribution valve (2.2) is opening or closing too early, opening or closing normally, or opening or closing too late, including the following situations: When the plunger (1.2) of the digital pump changes from the oil pressure state to the oil suction state: The rotation angle of the rotating shaft (1.4) reaches the predetermined rotation angle α 1 , execute the premature opening judgment, and set the pressure difference P between the plunger cavity pressure sensor (3.3) and the low pressure oil circuit pressure sensor (3.2) 1 With the domain value P TH1 For comparison, if the pressure difference P 1 Below the threshold P TH1 , it is judged to be opened too early; if the pressure difference P 1 Greater than the threshold value P TH1 , it is judged to be opened normally; The rotation angle of the axis (1.4) reaches α 开启 , the valve controller (3.1) outputs an opening signal; The rotation angle of the rotating shaft (1.4) reaches the predetermined rotation angle α 2 , execute the judgment of opening too late, and calculate the pressure difference P between the plunger cavity pressure sensor (3.3) and the low pressure oil circuit pressure sensor (3.2) 2 With the domain value P TH2 For comparison, if the pressure difference P 2 Below the threshold P TH2 , it is judged to be opened too late; if the pressure difference P 2 Greater than the threshold value P TH2 , it is judged to be turned on normally and no operation is performed.

6. The adaptive control method of a digital pump flow distribution system according to claim 5, It is characterized in that Compare the pressure difference with the pressure difference threshold value of the current detection point to determine whether the distribution valve (2.2) is opening or closing too early, opening or closing normally, or opening or closing too late, including the following situations: When the plunger (1.2) of the digital pump changes from the oil suction state to the oil pressure state: The rotation angle of the rotating shaft (1.4) reaches the predetermined rotation angle α 3 , execute premature closing judgment, and set the pressure difference P between the plunger cavity pressure sensor (3.3) and the low pressure oil circuit pressure sensor (3.2) 3 With the domain value P TH3 For comparison, if the pressure difference P 3 Below the threshold P TH3 , it is judged to be closed too early; if the pressure difference P 3 Greater than the threshold value P TH3 , it is judged to be closed normally; The rotation angle of the axis (1.4) reaches α 关闭 , the valve controller (3.1) outputs a closing signal; The rotation angle of the rotating shaft (1.4) reaches the predetermined rotation angle α 4 , execute the judgment of closing too late, and set the pressure difference P between the plunger cavity pressure sensor (3.3) and the low pressure oil circuit pressure sensor (3.2) 4 With the domain value P TH4 For comparison, if the pressure difference P 4 Below the threshold P TH4 , it is judged to be closed too late; if the pressure difference P 4 Greater than the threshold P TH4 , it is judged to be closed normally.

7. The adaptive control method of a digital pump flow distribution system according to claim 6, It is characterized in that According to different opening and closing defects, the valve controller (3.1) sends corresponding compensation instructions for compensation correction, including the following situations: When it is judged to be opened too early, a reduction compensation amount δ is executed 开 The program will keep the changed value as the compensation value for the next start judgment; When it is judged to be turned on too late, an increase in compensation amount δ is executed 开 The program will keep the changed value as the compensation value for the next start judgment; When it is judged to be closed too early, a reduction compensation amount δ is executed 关 The program will keep the changed value as the compensation amount for the next shutdown judgment; When it is judged that the closing is too late, an increase in compensation amount δ is executed 关 The program will keep the changed value as the compensation amount for the next shutdown judgment.

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