Flow regulation control method and device and double-pump forced lubrication hydraulic system

Abstract

The invention relates to a flow regulation control method and device and a double-pump forced lubrication hydraulic system.The flow regulation control method is applied to a controller in the double-pump forced lubrication hydraulic system and comprises the steps that system state information corresponding to the double-pump forced lubrication hydraulic system is obtained; according to the system state information, the system working condition corresponding to the double-pump forced lubrication hydraulic system is determined; according to the system state information and the system working condition, regulating valve control signals and electronic pump control signals are generated, the regulating valve control signals are used for controlling the first flow regulating valve and the second flow regulating valve, and the electronic pump control signals are used for controlling an electronic pump driving motor. By adopting the method, the flexibility of flow control can be improved.

Description

Technical Field

[0001] The present application relates to the field of hydraulic control technology, and in particular to a flow regulation control method, device and dual-pump forced lubrication hydraulic system. Background Art

[0002] At present, the dual-pump forced lubrication hydraulic system in the vehicle electric drive assembly mainly adopts a lubrication method in which the reducer and the motor are supplied with oil separately. Among them, the reducer side mostly uses a mechanical pump for oil supply, while the motor side uses an electronic pump for oil supply.

[0003] In the related technology, the flow rate of the mechanical pump and the electronic pump is regulated and controlled by monitoring the oil pressure or oil flow at the oil outlet. However, due to the high dependence of the mechanical pump on the input speed of the reducer, some lubrication points will be poorly lubricated under certain specific working conditions, such as low-speed and heavy-load working conditions, which will reduce the life of the assembly. Under high-speed and low-load working conditions, a large amount of oil supply will cause waste of the hydraulic system. In addition, under a -40℃ environment, the reducer will start at low temperature and will work in an oil-free condition for a short time, causing irreversible damage to the reducer assembly.

[0004] However, the current flow regulation control method has no clear countermeasures to the above problems. Summary of the invention

[0005] Based on this, it is necessary to provide a flow regulation control method, device and dual-pump forced lubrication hydraulic system that can flexibly control the flow rate in order to address the above technical problems.

[0006] In a first aspect, the present application provides a flow regulation control method, which is applied to a controller in a dual-pump forced lubrication hydraulic system, and the method comprises:

[0007] Obtain system status information corresponding to the dual-pump forced lubrication hydraulic system;

[0008] According to the system status information, determine the system working condition corresponding to the dual-pump forced lubrication hydraulic system;

[0009] According to the system status information and system operating conditions, a regulating valve control signal and an electronic pump control signal are generated. The regulating valve control signal is used to control the first flow regulating valve and the second flow regulating valve, and the electronic pump control signal is used to control the electronic pump drive motor.

[0010] In one embodiment, determining the system operating condition corresponding to the dual-pump forced lubrication hydraulic system according to the system status information includes:

[0011] According to the system status information, determine the output flow of the mechanical pump, the required flow on the reducer side, and the required flow on the motor side;

[0012] The system operating condition is determined based on the mechanical pump output flow, the reducer side demand flow, the motor side demand flow and system status information.

[0013] In one embodiment, the system status information includes: motor speed and oil temperature; according to the output flow of the mechanical pump, the required flow of the reducer side, the required flow of the motor side and the system status information, the system working condition is determined, including:

[0014] When the motor speed is lower than the driving speed and the oil temperature is lower than the temperature threshold, the system operating condition is determined as a preheating condition;

[0015] When the motor speed is greater than or equal to the driving speed, and / or the oil temperature is greater than or equal to the temperature threshold, the system operating condition is determined according to the mechanical pump output flow, the reducer side demand flow and the motor side demand flow.

[0016] In one embodiment, the system operating condition is determined according to the output flow of the mechanical pump, the required flow on the reducer side, and the required flow on the motor side, including:

[0017] The required flow rate on the reducer side and the required flow rate on the motor side are summed to obtain the target required flow rate;

[0018] When the output flow of the mechanical pump is less than the target required flow, the system operating condition is determined as the electronic pump auxiliary operating condition;

[0019] When the output flow rate of the mechanical pump is greater than or equal to the target demand flow rate, the system operating condition is determined as the operating condition of the mechanical pump acting alone.

[0020] In one embodiment, generating a regulating valve control signal and an electronic pump control signal according to system state information and system operating conditions includes:

[0021] When the system operating condition is a preheating operating condition, generating a regulating valve control signal for closing the first flow regulating valve and the second flow regulating valve according to a preset first current;

[0022] Determine the output flow data of the electronic pump according to the output flow of the mechanical pump, the required flow on the reducer side, and the required flow on the motor side;

[0023] An electronic pump control signal is obtained according to the electronic pump output flow data.

[0024] In one embodiment, generating a regulating valve control signal and an electronic pump control signal according to system state information and system operating conditions includes:

[0025] When the system working condition is the electronic pump auxiliary working condition or the mechanical pump single working condition, the current coefficient and the electronic pump motor speed are obtained according to the preset mapping relationship, system state information, the required flow rate on the reducer side and the required flow rate on the motor side;

[0026] Performing linear operation on the current coefficient and the preset second current to obtain a regulating valve control signal;

[0027] An electronic pump control signal is generated according to the electronic pump motor speed.

[0028] In a second aspect, the present application also provides a flow regulation control device, which is applied to a controller in a dual-pump forced lubrication hydraulic system, and the device comprises:

[0029] An information acquisition module, used to acquire system status information corresponding to the dual-pump forced lubrication hydraulic system;

[0030] A working condition determination module, used for determining the system working condition corresponding to the dual-pump forced lubrication hydraulic system according to the system status information;

[0031] The signal generating module is used to generate a regulating valve control signal and an electronic pump control signal according to the system status information and the system operating condition. The regulating valve control signal is used to control the first flow regulating valve and the second flow regulating valve, and the electronic pump control signal is used to control the electronic pump drive motor.

[0032] In a third aspect, the present application further provides a dual-pump forced lubrication hydraulic system, comprising: a controller, configured to execute the flow regulation control method according to the first aspect;

[0033] A driving motor, used for connecting with a mechanical pump;

[0034] The electronic pump driving motor is used to be connected to the electronic pump and to control the electronic pump based on the electronic pump control signal.

[0035] In one embodiment, the system further comprises:

[0036] A first one-way valve; a first end of the first one-way valve is connected to the mechanical pump, and a second end of the first one-way valve is connected to the heat exchanger;

[0037] A second one-way valve, wherein a first end of the second one-way valve is connected to the electronic pump, and a second end of the second one-way valve is connected to the heat exchanger.

[0038] In one embodiment, the system further includes: a relief valve, a first end of the relief valve is connected to the oil outlet of the mechanical pump and the oil outlet of the electronic pump, and a second end of the relief valve is connected to the oil pan.

[0039] The flow regulation control method, device and dual-pump forced lubrication hydraulic system mentioned above, in which the flow regulation control method provided on the one hand is applied to the controller in the dual-pump forced lubrication hydraulic system, and the method includes: obtaining the system status information corresponding to the dual-pump forced lubrication hydraulic system; determining the system working condition corresponding to the dual-pump forced lubrication hydraulic system according to the system status information; generating a regulating valve control signal and an electronic pump control signal according to the system status information and the system working condition, the regulating valve control signal is used to control the first flow regulating valve and the second flow regulating valve, and the electronic pump control signal is used to control the electronic pump drive motor. In this way, the system working condition is determined based on the system status information, and the control instructions for the first flow regulating valve, the second flow regulating valve and the electronic pump drive motor in the system are adjusted according to different system working conditions, so as to realize the flexible adjustment of the lubricating fluid flow and realize the optimal distribution of the flow of each branch. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] FIG1 is a schematic structural diagram of a dual-pump forced lubrication hydraulic system in one embodiment;

[0042] FIG2 is a schematic flow chart of a flow rate regulation control method in one embodiment;

[0043] FIG3 is a flow chart of steps for obtaining a current coefficient and a motor speed of an electronic pump in one embodiment;

[0044] FIG4 is a flow chart of a flow rate regulation control method in another embodiment;

[0045] FIG5 is a structural block diagram of a flow rate regulating control device in one embodiment;

[0046] FIG6 is a diagram showing the internal structure of a computer device in one embodiment;

[0047] Description of reference numerals:

[0048] 1. Oil pan; 2. First oil filter; 3. Second oil filter; 4. Drive motor; 5. Speed ​​regulating gear pair; 6. Mechanical pump; 7. First one-way valve; 8. Electronic pump drive motor; 9. Electronic pump; 10. Second one-way valve; 11. Heat exchanger; 12. Overflow valve; 13. First flow regulating valve; 14. Second flow regulating valve. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] The flow regulation control method provided in the embodiment of the present application can be applied to the dual-pump forced lubrication hydraulic system as shown in FIG1. ​​The system includes: a controller (not shown in FIG1), which is used to obtain the system status information corresponding to the dual-pump forced lubrication hydraulic system; according to the system status information, determine the system working condition corresponding to the dual-pump forced lubrication hydraulic system; according to the system status information and the system working condition, generate a regulating valve control signal and an electronic pump control signal, the regulating valve control signal is used to control the first flow regulating valve 13 and the second flow regulating valve 14, and the electronic pump control signal is used to control the electronic pump drive motor 8; the drive motor 4 is used to connect to the mechanical pump 6; the electronic pump drive motor 8 is used to connect to the electronic pump 9, and the electronic pump 9 is controlled based on the electronic pump control signal.

[0051] The controller may be a terminal or a server. The terminal may be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, IoT devices, and portable wearable devices. The server may be implemented as an independent server or a server cluster consisting of multiple servers.

[0052] In a possible implementation, the dual-pump forced lubrication hydraulic system further includes: a first one-way valve 7, a first end of the first one-way valve 7 is connected to the mechanical pump 6, and a second end is connected to the heat exchanger 11; a second one-way valve 10, a first end of the second one-way valve 10 is connected to the electronic pump 9, and a second end is connected to the heat exchanger 11. In this way, the problem of oil reflux of the mechanical pump 6 and the electronic pump 9 in a non-working state can be avoided.

[0053] In a possible implementation, the dual-pump forced lubrication hydraulic system further includes: a relief valve 12 , a first end of the relief valve 12 is connected to the oil outlet of the mechanical pump 6 and the oil outlet of the electronic pump 9 , and a second end of the relief valve 12 is connected to the oil pan 1 .

[0054] In an exemplary embodiment, as shown in FIG1 , a dual-pump forced lubrication hydraulic system is provided, comprising: an oil pan 1, a first oil filter 2, a second oil filter 3, a drive motor 4, a speed regulating gear pair 5, a mechanical pump 6, a first one-way valve 7, an electronic pump drive motor 8, an electronic pump 9, a second one-way valve 10, a heat exchanger 11, a relief valve 12, a first flow regulating valve 13, a second flow regulating valve 14 and a plurality of lubrication pipelines; wherein, the oil inlet of the first oil filter 2 is connected to the oil pan 1, the oil outlet of the first oil filter 2 is connected to the oil inlet of the mechanical pump 6, and the oil outlet of the mechanical pump 6 is connected to the oil inlet of the first one-way valve 7; the oil inlet of the second oil filter 3 is connected to the oil pan 1, the oil outlet of the second oil filter 3 is connected to the oil inlet of the electronic pump 9, and the oil outlet of the electronic pump 9 is connected to the oil inlet of the first one-way valve 7. The oil inlet of the second check valve 10 is connected; the oil outlet of the first check valve 7 and the oil outlet of the second check valve 10 are connected to the oil inlet of the heat exchanger 11 after merging through the lubrication pipeline; the oil outlet of the heat exchanger 11 is connected to the oil inlet of the relief valve 12, the oil inlet of the first flow regulating valve 13, and the oil inlet of the second flow regulating valve 14 after being divided by the lubrication pipeline; the oil outlet of the relief valve 12 is connected to the oil pan 1; the oil outlet of the first flow regulating valve 13 is connected to the reducer oil supply pipeline to lubricate the reducer side bearings, gears, etc.; the oil outlet of the second flow regulating valve 14 is connected to the motor oil supply pipeline to cool the motor; the mechanical pump 6 is mechanically connected to the output end of the speed regulating gear pair 5; the input end of the speed regulating gear pair 5 is mechanically connected to the drive motor 4; the electronic pump 9 is mechanically connected to the output end of the electronic pump drive motor 8.

[0055] The driving motor 4 drives the mechanical pump 6 to rotate through the speed regulating gear pair 5, sucks oil from the oil pan 1, and then passes through the first filter and the first one-way valve 7, and then merges with the oil in the oil supply branch of the electronic pump 9; the electronic pump driving motor 8 drives the electronic pump 9 to rotate, sucks oil from the oil pan 1, and then passes through the second filter and the second one-way valve 10, and then merges with the oil in the oil supply branch of the mechanical pump 6; after the oil of the two oil supply branches merges, it passes through the heat exchanger 11 and then enters each lubrication branch in two ways, one part of the oil enters the reducer side lubrication pipeline after passing through the first flow regulating valve 13, and provides lubricating fluid for the reducer bearings and gears; the other part of the oil enters the motor side lubrication pipeline after passing through the second flow regulating valve 14, and provides lubrication for the motor.

[0056] The dual-pump forced lubrication hydraulic system provided in this embodiment can realize two modes: the mechanical pump 6 supplies oil alone or the mechanical pump 6 and the electronic pump 9 supply oil together, according to the required oil volume of the lubrication pipeline on the reducer side and the lubrication pipeline on the motor side; by controlling the opening of the first flow regulating valve 13 and the second flow regulating valve 14, the lubricating fluid flow can be regulated on demand.

[0057] In an exemplary embodiment, as shown in FIG2 , a flow rate regulation control method is provided, which is described by taking the method applied to the controller in FIG1 as an example, and includes the following steps 202 to 206. Among them:

[0058] Step 202: Obtain system status information corresponding to the dual-pump forced lubrication hydraulic system.

[0059] The system status information includes status information corresponding to each component in the dual-pump forced lubrication hydraulic system in FIG. 1 , which may be information collected by sensors connected to each component and sent to the controller.

[0060] Exemplarily, the system status information may include: ambient temperature, motor speed, motor torque, oil temperature of the oil pan 1, outlet pressure of the mechanical pump 6, and outlet pressure of the electronic pump 9. The oil temperature is the oil temperature of the oil pan 1; the motor speed is the speed of the drive motor 4.

[0061] Step 204: Determine the system operating condition corresponding to the dual-pump forced lubrication hydraulic system according to the system status information.

[0062] In a possible implementation, step 204 may further include: determining the mechanical pump output flow, the reducer side demand flow, and the motor side demand flow based on the system status information; determining the system operating condition based on the mechanical pump output flow, the reducer side demand flow, the motor side demand flow and the system status information.

[0063] For example, the mechanical pump output flow rate Q 机械 It can be calculated by the motor speed and the outlet pressure of the mechanical pump 6 in the system status information. The required flow rate Q1 on the reducer side can be estimated by the lubrication demand of the reducer, the ambient temperature and the oil temperature. Usually, the required flow rate is greatly affected by the temperature. The higher the temperature, the lower the viscosity of the lubricant and the greater the required flow rate. The required flow rate Q2 on the motor side can be determined based on the motor speed and motor torque. The higher the motor power, the more heat is generated, and the required flow rate increases accordingly.

[0064] In a possible implementation, the system status information includes: motor speed and oil temperature; according to the output flow rate Q of the mechanical pump 机械 , the required flow rate Q1 on the reducer side, the required flow rate Q2 on the motor side and the system status information, the process of determining the system working condition can further include: when the motor speed is less than the driving speed and the oil temperature is less than the temperature threshold, determining the system working condition as the preheating working condition; when the motor speed is greater than or equal to the driving speed, and / or the oil temperature is greater than or equal to the temperature threshold, determining the system working condition as the preheating working condition according to the output flow rate Q of the mechanical pump 机械 , the required flow rate Q1 on the reducer side and the required flow rate Q2 on the motor side determine the system operating conditions.

[0065] Furthermore, the required flow rate Q1 on the reducer side and the required flow rate Q2 on the motor side are summed to obtain the target required flow rate; 机械 When the flow rate is less than the target demand, the system operating condition is determined as the electronic pump auxiliary condition; when the mechanical pump output flow rate Q 机械 When the flow rate is greater than or equal to the target demand flow rate, the system operating condition is determined as the mechanical pump acting alone.

[0066] Step 206 , generating a regulating valve control signal and an electronic pump control signal according to the system state information and the system operating conditions, wherein the regulating valve control signal is used to control the first flow regulating valve 13 and the second flow regulating valve 14 , and the electronic pump control signal is used to control the electronic pump drive motor 8 .

[0067] Optionally, under the preheating condition, step 206 may further include: generating a regulating valve control signal for closing the first flow regulating valve 13 and the second flow regulating valve 14 according to the preset first current I1; determining the electronic pump output flow data according to the mechanical pump output flow, the required flow on the reducer side and the required flow on the motor side; and obtaining the electronic pump control signal according to the electronic pump output flow data.

[0068] Under the preheating condition, the motor speed is less than the driving speed, and the oil temperature is lower than the temperature threshold, the required flow rate Q1 on the reducer side and the required flow rate Q2 on the motor side are both 0, and the regulating valve control signal is used to control the valve opening of the first flow regulating valve 13 and the second flow regulating valve 14 to be 0, so that the system pressure rises to the opening pressure of the overflow valve 12, and the lubricating fluid directly flows back to the oil pan 1 after passing through the electronic pump 9, the heat exchanger 11, and the overflow valve 12, so as to achieve rapid heating of the oil. In this embodiment, the electronic pump control signal is used to control the electronic pump drive motor 8, and the regulating valve control signal is used to control the first flow regulating valve 13 and the second flow regulating valve 14 to be closed, so as to achieve rapid heating of the lubricating fluid when the reducer is not in operation, avoid irreversible damage caused by oil-free operation, and greatly improve the reliability of the electric drive assembly.

[0069] Optionally, in the case of an electronic pump-assisted operating condition or a mechanical pump-alone operating condition, step 206 may further include: obtaining a current coefficient and an electronic pump motor speed according to a preset mapping relationship, system status information, a required flow rate on the reducer side, and a required flow rate on the motor side; performing linear operation processing on the current coefficient and a preset second current I2 to obtain a regulating valve control signal; and generating an electronic pump control signal according to the electronic pump motor speed.

[0070] The first current I1 is the current value corresponding to the valve opening of the first flow regulating valve 13 and the second flow regulating valve 14 when the valve opening is 0, and the second current I2 is the current value corresponding to the valve opening of the first flow regulating valve 13 and the second flow regulating valve 14 when the valve opening is 50%. Exemplarily, the first flow regulating valve 13 and the second flow regulating valve 14 are controlled by a standard signal of 4-20mA, and the first current I1 corresponding to the opening of 0 can be 4mA; the second current I2 corresponding to the opening of 50% can be 12mA.

[0071] Among them, the mapping relationship can be a plurality of pre-stored mapping tables (Mapping Table, MAP). In each row of the mapping table, it is determined whether the system status information, the required flow rate on the reducer side and the required flow rate on the motor side are within the allowable range, and the mapping results that meet all the allowable ranges are output to obtain the current coefficient and the speed of the electronic pump motor.

[0072] In a possible implementation, as shown in FIG3 , the process of obtaining the current coefficient and the electronic pump motor speed according to the preset mapping relationship, the system state information, the required flow rate on the reducer side and the required flow rate on the motor side may further include:

[0073] Step 301, input the required flow rate Q1 on the reducer side, the required flow rate Q2 on the motor side, the motor speed S, the oil temperature T, and the preset motor speed increment △S, the oil temperature increment △T, the maximum number of rows in the mapping table NUMmax, set the current index row number NUM=1, and the output flow value of the mechanical pump corresponding to the current index row number is Q NUM .

[0074] Step 302, determine whether NUM≤NUMmax holds, if so, execute step 303, if not, execute step 310.

[0075] Step 303, determine S-△S / 2≤S NUM ≤S+△S / 2 is established, if yes, execute step 304, if not, execute step 311, and then execute step 302.

[0076] Among them, S NUM The motor speed corresponding to the current index row number.

[0077] Step 304, determine whether T-△T / 2≤T NUM ≤T+△T / 2 is established. If so, execute step 305. If not, set NUM=NUM+1 and then execute step 302.

[0078] Among them, T NUM The oil temperature corresponding to the current index row number.

[0079] Step 305, determine QNUM ≥Q1+Q2. If yes, go to step 306; if no, go to step 307.

[0080] Step 306, determine whether S1=0 is true, if true, execute step 307, if not true, set NUM=NUM+1, and then execute step 302.

[0081] Wherein, S1 is the speed of the electronic pump motor corresponding to the current index row number. If step 305 is established, the mechanical pump single action condition is entered, and S1=0.

[0082] Step 307, determine Q1 NUM ≥Q1 is established, if yes, execute step 308, if not, set NUM=NUM+1, and then execute step 302.

[0083] Among them, Q1 NUM The required flow rate on the input reducer side corresponding to the current number of index rows.

[0084] Step 308, determine Q2 NUM ≥Q2 is established, if yes, execute step 309, if not, set NUM=NUM+1, and then execute step 302.

[0085] Step 309 , output the electronic pump motor speed S1 and current coefficient K of the NUMth row in the mapping table.

[0086] Among them, Q2 NUM It is the motor side demand flow corresponding to the current index row number.

[0087] Step 310: Display a default error prompt.

[0088] Step 311, let NUM=NUM+1.

[0089] In an exemplary embodiment, the provided method further includes: conducting a test calibration on the dual-pump forced lubrication hydraulic system to obtain a mapping relationship, specifically including the following steps:

[0090] Step 1: Set the initial value of the number of rows NUM=1, the speed of the drive motor 4 S=0, the oil temperature T=0, the speed of the electronic pump motor S1=0, the current coefficient K=0; the motor speed increment △S; the oil temperature increment △T; the electronic pump motor speed increment △S1.

[0091] Step 2: Determine whether the speed of the driving motor 4 S≤Smax is established. If established, execute Step 3; if not established, stop.

[0092] Wherein, Smax is the preset maximum speed of the driving motor 4.

[0093] Step 3: Determine whether the oil temperature T≤Tmax is established. If so, execute Step 4; if not, set S=S+△S, T=0, S1=0, K=0, and then execute Step 2.

[0094] Among them, Tmax is the preset maximum oil temperature.

[0095] Step 4: Determine whether the electronic pump motor speed S1≤S1max is established. If it is established, execute Step 5; if not, set T=T+△T, S1=0, K=0; then execute Step 3.

[0096] Among them, S1max is the preset maximum speed of the electronic pump motor.

[0097] Step 5: Determine whether the current coefficient K≤Kmax holds. If so, execute Step 6. If not, set S1=S1+△S1 and then execute Step 4.

[0098] Wherein, Kmax is the preset maximum value of the current coefficient.

[0099] Step 6: Get the NUMth row, where the first four elements are the header values, that is, [S, T, S1, K] correspond to the motor speed and oil temperature obtained based on the sensor signal, and the current coefficient K and the electronic pump motor speed value S1 obtained from the table; the NUMth row also includes the test calibration reducer side lubrication pipeline distribution flow Q1 and the motor side lubrication pipeline distribution flow Q2 under the corresponding working conditions; then set K=K+△K, NUM=NUM+1; then execute Step 5 until a mapping relationship is formed.

[0100] In an exemplary embodiment, as shown in FIG4 , a flow rate regulation control method is provided, which is described by taking the method applied to the controller in FIG1 as an example, and includes the following steps 401 to 412. Among them:

[0101] Step 401, obtaining system status information corresponding to the dual-pump forced lubrication hydraulic system, the system status information including: motor speed and oil temperature.

[0102] Step 402, determining the output flow of the mechanical pump, the required flow on the reducer side, and the required flow on the motor side according to the system status information.

[0103] Step 403: when the motor speed is less than the driving speed and the oil temperature is less than the temperature threshold, the system operating condition is determined as a preheating operating condition.

[0104] Step 404 , when the motor speed is greater than or equal to the driving speed, and / or the oil temperature is greater than or equal to the temperature threshold, the required flow rate on the reducer side and the required flow rate on the motor side are summed to obtain a target required flow rate.

[0105] Step 405: when the output flow rate of the mechanical pump is less than the target required flow rate, the system operating condition is determined as an electronic pump auxiliary operating condition.

[0106] Step 406: When the output flow rate of the mechanical pump is greater than or equal to the target demand flow rate, the system operating condition is determined as the operating condition of the mechanical pump acting alone.

[0107] Step 407 : When the system operating condition is the preheating operating condition, a regulating valve control signal for closing the first flow regulating valve 13 and the second flow regulating valve 14 is generated according to the preset first current.

[0108] Step 408, determining the electronic pump output flow data according to the mechanical pump output flow, the reducer side required flow and the motor side required flow.

[0109] Step 409, obtaining an electronic pump control signal according to the electronic pump output flow data.

[0110] Step 410, when the system operating condition is an electronic pump auxiliary condition or a mechanical pump single working condition, the current coefficient and the electronic pump motor speed are obtained according to the preset mapping relationship, system state information, the required flow rate on the reducer side and the required flow rate on the motor side.

[0111] Step 411, performing linear operation processing on the current coefficient and the preset second current to obtain a regulating valve control signal.

[0112] Step 412: Generate an electronic pump control signal according to the speed of the electronic pump motor.

[0113] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0114] Based on the same inventive concept, the embodiment of the present application also provides a flow control device for implementing the flow control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more flow control device embodiments provided below can refer to the limitations of the flow control method above, and will not be repeated here.

[0115] In an exemplary embodiment, as shown in FIG5 , a flow regulation control device is provided, which is applied to a controller in a dual-pump forced lubrication hydraulic system. The device includes: an information acquisition module 502, a working condition determination module 504 and a signal generation module 506, wherein:

[0116] An information acquisition module 502 is used to acquire system status information corresponding to the dual-pump forced lubrication hydraulic system;

[0117] The working condition determination module 504 is used to determine the system working condition corresponding to the dual-pump forced lubrication hydraulic system according to the system state information;

[0118] The signal generating module 506 is used to generate a regulating valve control signal and an electronic pump control signal according to the system status information and the system operating condition. The regulating valve control signal is used to control the first flow regulating valve 13 and the second flow regulating valve 14, and the electronic pump control signal is used to control the electronic pump drive motor 8.

[0119] In one embodiment, the operating condition determination module 504 is also used to determine the mechanical pump output flow, the reducer side demand flow and the motor side demand flow according to the system status information; and determine the system operating condition according to the mechanical pump output flow, the reducer side demand flow, the motor side demand flow and the system status information.

[0120] In one of the embodiments, the operating condition determination module 504 is also used to determine the system operating condition as a preheating condition when the motor speed is less than the driving speed and the oil temperature is less than a temperature threshold; when the motor speed is greater than or equal to the driving speed, and / or the oil temperature is greater than or equal to the temperature threshold, determine the system operating condition based on the mechanical pump output flow, the reducer side demand flow and the motor side demand flow.

[0121] In one of the embodiments, the operating condition determination module 504 is also used to sum the demand flow on the reducer side and the demand flow on the motor side to obtain a target demand flow; when the mechanical pump output flow is less than the target demand flow, the system operating condition is determined as an electronic pump auxiliary condition; when the mechanical pump output flow is greater than or equal to the target demand flow, the system operating condition is determined as a mechanical pump single action condition.

[0122] In one embodiment, the signal generating module 506 is also used to generate a regulating valve control signal for closing the first flow regulating valve 13 and the second flow regulating valve 14 according to a preset first current when the system operating condition is a preheating condition; determine the electronic pump output flow data according to the mechanical pump output flow, the reducer side required flow and the motor side required flow; and obtain the electronic pump control signal according to the electronic pump output flow data.

[0123] In one embodiment, the signal generating module 506 is also used to obtain the current coefficient and the electronic pump motor speed according to the preset mapping relationship, system status information, the required flow on the reducer side and the required flow on the motor side when the system operating condition is the electronic pump auxiliary condition or the mechanical pump single working condition; perform linear operation processing on the current coefficient and the preset second current to obtain the regulating valve control signal; and generate the electronic pump control signal according to the electronic pump motor speed.

[0124] Each module in the above-mentioned flow regulation control device can be implemented in whole or in part by software, hardware or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0125] In an exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be shown in FIG6. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store system status information. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a flow regulation control method is implemented.

[0126] Those skilled in the art will understand that the structure shown in FIG. 6 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0127] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0128] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0129] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0130] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0131] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0132] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A flow regulation control method, characterized in that: A controller applied to a dual-pump forced lubrication hydraulic system, the method comprising: Obtaining system status information corresponding to the dual-pump forced lubrication hydraulic system; Determining a system operating condition corresponding to the dual-pump forced lubrication hydraulic system according to the system status information; According to the system status information and the system operating conditions, a regulating valve control signal and an electronic pump control signal are generated, the regulating valve control signal is used to control the first flow regulating valve and the second flow regulating valve, and the electronic pump control signal is used to control the electronic pump drive motor.

2. The method according to claim 1, characterized in that: Determining the system operating condition corresponding to the dual-pump forced lubrication hydraulic system according to the system status information includes: Determine the output flow of the mechanical pump, the required flow on the reducer side, and the required flow on the motor side according to the system status information; The system operating condition is determined according to the output flow of the mechanical pump, the required flow on the reducer side, the required flow on the motor side and the system status information.

3. The method according to claim 2, characterized in that The system status information includes: motor speed and oil temperature; the system operating condition is determined according to the output flow of the mechanical pump, the required flow of the reducer side, the required flow of the motor side and the system status information, including: When the motor speed is less than the driving speed and the oil temperature is less than a temperature threshold, determining the system operating condition as a preheating operating condition; When the motor speed is greater than or equal to the driving speed, and / or the oil temperature is greater than or equal to the temperature threshold, the system operating condition is determined based on the mechanical pump output flow, the reducer side demand flow and the motor side demand flow.

4. The method according to claim 3, characterized in that The determining the system operating condition according to the output flow of the mechanical pump, the required flow on the reducer side and the required flow on the motor side includes: The required flow rate on the reducer side and the required flow rate on the motor side are summed to obtain a target required flow rate; When the output flow rate of the mechanical pump is less than the target required flow rate, determining the system operating condition as an electronic pump auxiliary operating condition; When the output flow rate of the mechanical pump is greater than or equal to the target demand flow rate, the system operating condition is determined as a mechanical pump single-acting operating condition.

5. The method according to claim 3, characterized in that: The generating of the regulating valve control signal and the electronic pump control signal according to the system state information and the system operating condition comprises: When the system operating condition is a preheating condition, generating a regulating valve control signal for closing the first flow regulating valve and the second flow regulating valve according to a preset first current; Determine the output flow data of the electronic pump according to the output flow of the mechanical pump, the required flow on the reducer side and the required flow on the motor side; The electronic pump control signal is obtained according to the flow rate data output by the electronic pump.

6. The method according to claim 3, characterized in that: The generating of the regulating valve control signal and the electronic pump control signal according to the system state information and the system operating condition comprises: When the system operating condition is an electronic pump auxiliary operating condition or a mechanical pump single operating condition, the current coefficient and the electronic pump motor speed are obtained according to a preset mapping relationship, the system state information, the required flow rate on the reducer side and the required flow rate on the motor side; Performing linear operation processing on the current coefficient and the preset second current to obtain the regulating valve control signal; The electronic pump control signal is generated according to the rotation speed of the electronic pump motor.

7. A flow regulating control device, characterized in that: A controller used in a dual-pump forced lubrication hydraulic system, the device comprising: An information acquisition module, used to acquire system status information corresponding to the dual-pump forced lubrication hydraulic system; A working condition determination module, used for determining the system working condition corresponding to the dual-pump forced lubrication hydraulic system according to the system state information; The signal generating module is used to generate a regulating valve control signal and an electronic pump control signal according to the system status information and the system operating condition, wherein the regulating valve control signal is used to control the first flow regulating valve and the second flow regulating valve, and the electronic pump control signal is used to control the electronic pump drive motor.

8. A dual-pump forced lubrication hydraulic system, characterized in that: The system comprises: a controller for executing the flow regulation control method according to any one of claims 1 to 6; A driving motor, used for connecting with a mechanical pump; The electronic pump driving motor is used to be connected to the electronic pump and control the electronic pump based on the electronic pump control signal.

9. The system according to claim 8, characterized in that The system further comprises: A first one-way valve; a first end of the first one-way valve is connected to the mechanical pump, and a second end of the first one-way valve is connected to the heat exchanger; A second one-way valve, wherein a first end of the second one-way valve is connected to the electronic pump, and a second end of the second one-way valve is connected to the heat exchanger.

10. The system according to claim 8, characterized in that The system further comprises: an overflow valve, a first end of the overflow valve being connected to the oil outlet of the mechanical pump and the oil outlet of the electronic pump, and a second end of the overflow valve being connected to the oil pan.

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