Hydraulic oil supply control system, method, control device and excavator

Abstract

The present invention relates to an excavator. To solve the problem of unbalanced operation of the two oil pumps in an excavator with a dual-pump configuration, the present invention constructs a hydraulic oil supply control system, method, control device, and excavator. The control system includes a first oil pump, a first main valve, a third main valve, a second oil pump, and a second main valve whose oil inlet is connected to the second oil pump. The first main valve and the third main valve oil inlet are both connected to the first oil pump. The control system also includes: an oil supply distribution valve connected between the oil inlet of the third main valve and the second oil pump for controlling the on-off of the oil supply line between the third main valve and the second oil pump; a detection device for detecting the life parameters of the oil pumps; a controller for calculating the remaining life value of the corresponding oil pumps based on the life parameters; and controlling the displacement of each oil pump and the on-off of the oil supply distribution valve based on the remaining life value of the oil pumps when the third main valve is switched. The present invention realizes oil supply coordination between the two pumps, achieves balanced operation of the two pumps, and prevents premature excessive wear and failure of one pump.

Description

Technical Field

[0001] The present invention relates to an excavator, and more particularly to a hydraulic oil supply control system, method, control device and excavator. Background Art

[0002] Excavators are complex construction machines equipped with numerous hydraulic actuators, including the left travel motor, right travel motor, swing motor, boom cylinder, arm cylinder, bucket cylinder, and other components. While the excavator is moving or operating, these hydraulic actuators do not operate simultaneously. To maximize the efficiency of the oil pumps, excavators are typically equipped with two oil pumps supplying oil to the hydraulic actuators. The oil supply sources for these key hydraulic actuators are distributed, with some hydraulic actuators supplied by one pump and others by the other. For example, a common oil distribution pattern on existing excavators is that the left travel motor, boom cylinder, bucket cylinder, and attachments are typically supplied by the left pump, while the swing motor, arm cylinder, and right travel motor are supplied by the right pump. Due to the diversity of excavator operating conditions, the working time of each hydraulic actuator is not absolutely balanced. For example, when crushing operations are performed through the breaker hammer of the attachment, the operation time of other hydraulic actuators is relatively short. If the crushing operation is performed for a long time, the working time of the two oil pumps will be unbalanced, and the left pump that supplies oil to the attachment will wear faster than the right pump, and it may even end its life cycle prematurely. Summary of the Invention

[0003] The technical problem to be solved by the present invention is the unbalanced operation of the two oil pumps on an excavator with a dual-pump configuration, and a hydraulic oil supply control system, method, control device and excavator are provided to ensure that the dual pumps of the excavator work in a balanced manner during operation.

[0004] The technical solution for achieving the object of the present invention is as follows: a hydraulic oil supply control system is constructed, comprising a first oil pump, at least one first main valve, at least one third main valve, a second oil pump, and at least one second main valve having an oil inlet connected to the second oil pump, wherein the oil inlet of each of the first main valve and the third main valve is connected to the first oil pump, and the control system further comprises:

[0005] The oil supply distribution valve is connected between the oil inlet end of the third main valve and the second oil pump, and is used to control the on-off of the oil supply line between the third main valve and the second oil pump;

[0006] a detection device for detecting life parameters of the first oil pump and / or the second oil pump, wherein the life parameters can be used to calculate the remaining life value of the corresponding oil pump;

[0007] The controller is used to calculate the remaining life value of the corresponding oil pump based on the life parameter, and control the displacement of each oil pump and the on-off of the oil supply distribution valve according to the remaining life value of the first oil pump and / or the second oil pump when the third main valve is switched.

[0008] In the present invention, by detecting the life parameters of the oil pumps, calculating the remaining life value, and controlling the displacement of each oil pump and the on-off of the oil supply distribution valve according to the remaining life value of the oil pumps, when the third main valve is switched, one of the two oil pumps can be selected to supply oil or the two pumps can be combined to supply oil, thereby realizing the oil supply work allocation of the two pumps, achieving balanced operation of the two pumps, and avoiding premature wear and failure of one pump.

[0009] In the hydraulic oil supply control system of the present invention, the detection device includes a swash plate angle sensor for detecting the actual swing angle of the oil pump swash plate;

[0010] The controller is used to determine the theoretical swing angle of the swash plate of the corresponding oil pump based on the displacement control current output to the corresponding oil pump when detecting the swash plate angle sensor, and calculate the remaining life value of the corresponding oil pump based on the ratio of the actual swing angle of the oil pump swash plate to the theoretical swing angle.

[0011] In the hydraulic oil supply control system of the present invention, the detection device includes a timing module, which is used to record the cumulative working time of the oil pump when the displacement control current is greater than the set value, and the controller is used to calculate the remaining life value of the corresponding oil pump based on the cumulative working time of the oil pump.

[0012] In the hydraulic oil supply control system of the present invention, the control system further comprises a flow demand input device electrically connected to the controller for inputting flow demand, and the controller is further configured to control the displacement of each oil pump according to the flow demand.

[0013] In the hydraulic oil supply control system of the present invention, the control system further comprises at least one fourth main valve whose oil inlet end is connected to the oil supply distribution valve, and the oil supply distribution valve selectively connects the second oil pump to either the third main valve or the fourth main valve.

[0014] The present invention provides a technical solution for achieving its objectives as follows: a hydraulic oil supply control method is disclosed, wherein the hydraulic oil supply control system used in the control method includes a first oil pump, at least one first main valve, at least one third main valve, a second oil pump, at least one second main valve having an oil inlet connected to the second oil pump, and an oil supply distribution valve for controlling the on-off of the oil supply line between the third main valve and the second oil pump, wherein the oil inlet of each of the first main valve and the third main valve is connected to the first oil pump; the control method comprises the following steps:

[0015] Step S1: detecting life parameters of the first oil pump and / or the second oil pump; and calculating the remaining life value of the corresponding oil pump based on the life parameters;

[0016] Step S2: When the third main valve is switched, the displacement of each oil pump and the on / off switching of the oil supply distribution valve are controlled according to the remaining life of the first oil pump and / or the second oil pump and the flow required by the hydraulic actuator controlled by the switching third main valve.

[0017] In the hydraulic oil supply control method of the present invention, the step of detecting the life parameter of the oil pump includes: detecting the actual swing angle of the oil pump swash plate and obtaining the displacement control current output to the corresponding oil pump when the swash plate angle sensor is used to detect the displacement control current, thereby determining the theoretical swing angle of the swash plate of the corresponding oil pump; and the step of calculating the remaining life value of the corresponding oil pump includes: calculating the ratio of the actual swing angle of the oil pump swash plate to the theoretical swing angle of the swash plate to obtain the remaining life value of the corresponding oil pump.

[0018] In the hydraulic oil supply control method of the present invention, the step of detecting the life parameters of the oil pump includes recording the cumulative working time of the oil pump when the displacement control current is greater than the set value; the step of calculating the remaining life value of the corresponding oil pump includes: calculating the ratio of the difference between the design life time of the oil pump and the cumulative working time of the oil pump to the design life time of the oil pump to obtain the corresponding remaining life value of the oil pump.

[0019] In the hydraulic oil supply control method of the present invention, the range of the displacement control current value of the oil pump is divided into several displacement current intervals from small to large, and a positively correlated interval weight coefficient is set for each displacement current interval; the step of detecting the life parameter of the oil pump includes recording the cumulative working time of the oil pump in each displacement current interval, and accumulating the product of the cumulative working time of each interval and the corresponding interval weight coefficient to obtain the weighted cumulative working time of the oil pump; the step of calculating the remaining life value of the corresponding oil pump includes: calculating the ratio of the difference between the design life time of the oil pump and the weighted cumulative working time to the design life time of the oil pump to obtain the remaining life value of the corresponding oil pump.

[0020] In the hydraulic oil supply control method of the present invention, in step S2:

[0021] When the remaining life value X of the first oil pump satisfies 0<X<a, the displacement of the first oil pump is controlled to be minimum, the oil supply distribution valve is controlled to open the oil supply line between the third main valve and the second oil pump, and the displacement of the second oil pump is controlled according to the flow required by the hydraulic actuator controlled by the third main valve;

[0022] When the remaining life value of the first oil pump is at X and satisfies b<X<1, the oil supply distribution valve is controlled to cut off the oil supply path between the third main valve and the second oil pump and the displacement of the first oil pump is controlled according to the flow required by the hydraulic actuator controlled by the third main valve;

[0023] When the remaining life value X of the first oil pump satisfies a≤X≤b, the oil supply distribution valve is controlled to open the oil supply line between the third main valve and the second oil pump and the displacement of the first oil pump and the second oil pump is controlled according to the flow required by the hydraulic actuator controlled by the switching third main valve;

[0024] The set values ​​a and b satisfy: 0<a<b<1.

[0025] In the hydraulic oil supply control method of the present invention, in step S2:

[0026] When the remaining life value Y of the second oil pump satisfies 0<Y<a, the oil supply distribution valve is controlled to cut off the oil supply path between the third main valve and the second oil pump and the displacement of the first oil pump is controlled according to the flow required by the hydraulic actuator controlled by the switching third main valve;

[0027] When the remaining life value of the second oil pump is at Y and satisfies b<Y<1, the displacement of the first oil pump is controlled to be minimum, the oil supply distribution valve is controlled to open the oil supply line between the third main valve and the second oil pump, and the displacement of the second oil pump is controlled according to the flow required by the hydraulic actuator controlled by the switching third main valve;

[0028] When the remaining life value Y of the second oil pump satisfies a≤Y≤b, the oil supply distribution valve is controlled to open the oil supply line between the third main valve and the second oil pump and the displacement of the first oil pump and the second oil pump is controlled according to the flow required by the hydraulic actuator controlled by the switching third main valve;

[0029] The set values ​​a and b satisfy: 0<a<b<1.

[0030] In the hydraulic oil supply control method of the present invention, in step S2:

[0031] When the remaining life value X of the first oil pump and the remaining life value Y of the second oil pump are both greater than c, the output flow rate is Control the displacement of the first oil pump according to the output flow rate Control the displacement of the second oil pump;

[0032] The setting value c range is 0.2<c<0.4; Q is the flow rate required for the hydraulic actuator controlled by the reversing third main valve to work.

[0033] The technical solution for achieving the purpose of the present invention is as follows: a control device is disclosed, which includes a processor and a memory, wherein a control program is stored in the memory, and the control program is loaded and executed by the processor to implement the aforementioned hydraulic oil supply control method.

[0034] The present invention provides a technical solution for achieving its objectives as follows: Disclosed is an excavator equipped with the aforementioned hydraulic oil supply control system; the first main valve includes a left travel control main valve for controlling the left travel hydraulic motor, a boom control main valve for controlling the boom cylinder, and an arm control main valve for controlling the dipper cylinder; the second main valve includes a bucket control main valve for controlling the bucket cylinder, an arm merging control main valve connected to the dipper control main valve output, and an arm merging control main valve connected to the boom control main valve output; the third main valve includes an attachment control main valve for controlling the attachment hydraulic actuator and / or a swing control main valve for controlling the swing motor. Furthermore, the second main valve also includes a right travel control main valve for controlling the right travel hydraulic motor, or the oil inlet of the right travel control main valve for controlling the right travel hydraulic motor is connected to an oil supply distribution valve, and the oil supply distribution valve selectively connects a second oil pump to either the third main valve or the right travel control main valve.

[0035] The present invention provides a technical solution for achieving its objectives as follows: an excavator is disclosed, comprising the aforementioned control device; a first main valve including a left travel control main valve for controlling a left travel hydraulic motor, a boom control main valve for controlling a boom cylinder, and an arm control main valve for controlling a dipper cylinder; a second main valve including a bucket control main valve for controlling a bucket cylinder, an arm merging control main valve connected to the dipper control main valve output, and an arm merging control main valve connected to the boom control main valve output; and a third main valve including an attachment control main valve for controlling an attachment hydraulic actuator and / or a swing control main valve for controlling a swing motor. Furthermore, the second main valve also includes a right travel control main valve for controlling a right travel hydraulic motor, or the oil inlet of the right travel control main valve for controlling the right travel hydraulic motor is connected to an oil supply distribution valve, which selectively connects a second oil pump to either the third main valve or the right travel control main valve.

[0036] Compared with the prior art, in the present invention, when the third main valve is switched, one of the two oil pumps can be selected to supply oil or the two pumps can be combined to supply oil, thereby realizing the oil supply work allocation of the two pumps, achieving balanced work of the two pumps, and avoiding premature wear and failure of one of the pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the hydraulic oil supply control system of the present invention.

[0038] Figure 2 It is a flow chart of the hydraulic oil supply control method of the present invention.

[0039] Figure 3 It is a block diagram of the control device of the present invention.

[0040] Parts names and serial numbers in the figure:

[0041] Working pump 1, first oil pump 11, second oil pump 12, first swash plate angle sensor 13, second swash plate angle sensor 14, controller 2, distribution valve 3, left travel control main valve 31, boom control main valve 32, arm control main valve 33, right travel control main valve 41, boom confluence control main valve 42, arm confluence control main valve 43, bucket control main valve 44, attachment control main valve 51, swing control main valve 52, oil supply distribution valve 61, solenoid valve 62. DETAILED DESCRIPTION

[0042] The specific implementation scheme is described below with reference to the accompanying drawings.

[0043] Example 1.

[0044] Figure 1 The hydraulic oil supply control system of this embodiment is shown, and the control system can be used for an excavator.

[0045] The hydraulic oil supply control system includes a working pump 1, a controller 2, a distribution valve 3, and a detection device. The working pump 1 includes a first oil pump 11 and a second oil pump 12.

[0046] The distribution valve 3 includes at least one first main valve, at least one third main valve, at least one second main valve, an oil supply distribution valve 61 and the like.

[0047] When the control system is used in an excavator, the first main valve includes a left travel control main valve 31 for controlling the left travel hydraulic motor, a boom control main valve 32 for controlling the boom cylinder, and an arm control main valve 33 for controlling the dipper cylinder. The second main valve includes a bucket control main valve 44 for controlling the bucket cylinder, an arm merging control main valve 43 connected to the output of the dipper control main valve 33, and an arm merging control main valve 42 connected to the output of the boom control main valve 32. The third main valve includes an attachment control main valve 51 for controlling the hydraulic actuators of the attachments and a swing control main valve 52 for controlling the swing motor. The distribution valve 3 also includes a right travel control main valve 41 for controlling the right travel hydraulic motor.

[0048] The oil inlets of the boom control main valve 32 and the boom confluence control main valve 42 are connected to the first oil pump 11 and the second oil pump 12, respectively, and their oil outlets are both connected to the boom cylinder. When the boom is raised or lowered, the boom cylinder is supplied with oil by the first oil pump 11 and the second oil pump 12, thereby achieving a large flow rate and enabling rapid movement. Similarly, the oil inlets of the arm control main valve 33 and the arm confluence control main valve 43 are connected to the first oil pump 11 and the second oil pump 12, respectively, and their oil outlets are both connected to the arm cylinder. When the arm swings back and forth, the arm cylinder is supplied with oil by the first oil pump 11 and the second oil pump 12, thereby achieving a large flow rate and enabling rapid movement.

[0049] like Figure 1As shown, the oil inlets of the first main valves in the distribution valve 3, namely the left travel control main valve 31, the boom control main valve 32, and the arm control main valve 33, are all connected to the pump port of the first oil pump 11, and are supplied with oil by the first oil pump 11. The oil inlets of the second main valves, namely the boom merging control main valve 42, the arm merging control main valve 43, and the bucket control main valve 44, are connected to the pump port of the second oil pump 12, and are supplied with oil by the second oil pump 12.

[0050] The oil inlet of the third main valve, which also serves as the attachment control main valve 51 and the swing control main valve 52, is connected to the pump port of the first oil pump 11, receiving oil from the first oil pump 11. The third main valve is also connected to the pump port of the second oil pump 12 via the oil supply distribution valve 61. When the oil supply distribution valve 61 is in the open state, the third main valve also receives oil from the second oil pump 12.

[0051] The oil supply distribution valve 61 is a two-position, four-way valve. Its two oil inlets are connected to the oil inlets of the first oil pump 11 and the second oil pump 12, respectively. Its two oil outlets are connected to the oil inlet of the third main valve and the right travel control main valve 41, respectively. The hydraulic control end is connected to the solenoid valve 62, which is electrically connected to the controller 2. The controller 2 controls the operating position of the oil supply distribution valve 61 through the solenoid valve 62, thereby connecting the oil circuit between the second oil pump 12 and the oil inlet of the right travel control main valve 41, or connecting the oil circuit between the second oil pump 12 and the oil inlet of the third main valve, while also connecting the oil circuit between the first oil pump 11 and the oil inlet of the right travel control main valve 41.

[0052] In some examples, the right travel control main valve 41 can also serve as a second main valve, with its oil inlet directly connected to the second oil pump 12. The oil supply distribution valve 61 is only used to cut off or connect the third main valve and the second oil pump 12.

[0053] The detection device is used to detect life parameters of the first oil pump 11 and / or the second oil pump 12. These life parameters can be used to calculate the remaining life of the corresponding oil pump. In this example, the detection device includes a first swash plate angle sensor 13 and a second swash plate angle sensor 14, which are respectively provided in the first oil pump 11 and the second oil pump 12, and are used to detect the swing angle of the swash plate of the first oil pump 11 and the swing angle of the swash plate of the second oil pump 12.

[0054] The first oil pump 11 and the second oil pump 12 are plunger pumps. The controller 2 can output displacement control current to the first oil pump 11 and the second oil pump 12 to control the swing angle of the swash plate in the corresponding oil pump, thereby controlling the displacement of the corresponding oil pump.

[0055] When the detection device detects the swing angle of the oil pump swash plate, the controller 2 also determines the theoretical swing angle of the corresponding oil pump swash plate based on the displacement control current output to the corresponding oil pump, and calculates the remaining life value of the corresponding oil pump based on the ratio of the actual swing angle of the oil pump swash plate to the theoretical swing angle.

[0056] The oil pump controls the swash plate's swing angle using a displacement control current, which corresponds to the swash plate's swing angle. However, as the oil pump's internal components wear out with use, when the controller 2 outputs a certain displacement control current to the oil pump, the actual swing angle of the oil pump's swash plate deviates from the theoretical swing angle corresponding to that displacement control current. This deviation increases with wear. Therefore, the ratio of the actual swing angle of the oil pump's swash plate to the theoretical swing angle can be used as the remaining life value of the corresponding oil pump, used to evaluate the pump's lifespan. The remaining life value ranges from 0 to 1, with higher values ​​indicating better condition. When the value drops below a certain value, the oil pump loses its function.

[0057] In some examples, the detection device may also include a timing module, which is a software module configured in the controller 2. The timing module is used to record the cumulative working time of the oil pump when the displacement control current is greater than the set value. The controller 2 is used to calculate the remaining life value of the corresponding oil pump based on the cumulative working time of the oil pump, for example, using the ratio of the cumulative working time to the design life of the oil pump as the remaining life value of the corresponding oil pump.

[0058] In order to realize flow demand control of the two pumps, the control system further includes a flow demand input device, which is connected to the controller 2 and is used to input the flow required by the hydraulic actuator controlled by the third main valve when it is working.

[0059] The controller 2 is configured to control the displacement of each oil pump and the opening and closing of the oil supply distribution valve 61 based on the remaining life of the first oil pump 11 and / or the second oil pump 12 during the switching of the third main valve. For example, during the switching of the third main valve, i.e., when the auxiliary device is operating or rotating, if the remaining life of the first oil pump 11 is low, the displacement of the first oil pump 11 can be controlled to maintain a minimum value, while the oil supply distribution valve 61 is controlled to open and the displacement of the second oil pump 12 is controlled to supply oil to the third main valve and meet the flow demand. If the remaining life of the first oil pump 11 is high, the oil supply distribution valve 61 can be controlled to be closed, and the third main valve can be supplied with oil by the first oil pump 11 to meet the flow demand. If the remaining life of both the first oil pump 11 and the second oil pump 12 are at an intermediate value, the oil supply distribution valve 61 can be controlled to open and output appropriate displacement control currents to the first and second oil pumps 11, 12, so that both the first and second oil pumps 11, 12 supply oil to the third main valve.

[0060] In the present invention, by detecting the life parameters of the oil pump, calculating the remaining life value, and controlling the displacement of each oil pump and the on-off of the oil supply distribution valve 61 according to the remaining life value of the oil pump, the oil supply work of the two pumps is coordinated and the work of the two pumps is balanced, thereby avoiding premature wear and failure of one of the pumps.

[0061] Implementation 2.

[0062] The hydraulic oil supply control system used in the hydraulic oil supply control method of this embodiment includes a first oil pump 11, at least one first main valve, at least one third main valve, a second oil pump 12, at least one second main valve connected to the second oil pump 12 at its oil inlet end, and an oil supply distribution valve 61 for controlling the on-off of the oil supply line between the third main valve and the second oil pump 12. The oil inlet ends of each first main valve and the third main valve are connected to the first oil pump 11. The control method steps are as follows: Figure 2 As shown, the details are as follows:

[0063] Step S1: Detecting life parameters of the first oil pump 11 and / or the second oil pump 12; calculating the remaining life of the corresponding oil pump based on the life parameters;

[0064] Step S2: When the third main valve is switched, the displacement of each oil pump and the on / off switching of the oil supply distribution valve 61 are controlled according to the remaining life of the first oil pump 11 and / or the second oil pump 12 and the flow required by the hydraulic actuator controlled by the switching third main valve.

[0065] In step S1, detecting the oil pump life parameter includes detecting the actual swash plate swing angle of the oil pump and obtaining the displacement control current output by the swash plate angle sensor to the corresponding oil pump to determine the theoretical swash plate swing angle of the corresponding oil pump. Calculating the remaining life of the oil pump includes calculating the ratio of the actual swash plate swing angle of the oil pump to the theoretical swash plate swing angle to obtain the remaining life of the corresponding oil pump.

[0066] In step S1, the step of detecting the life parameters of the oil pump can also be: recording the cumulative working time of the oil pump when the displacement control current is greater than the set value; the step of calculating the remaining life value of the corresponding oil pump includes: calculating the ratio of the difference between the design life time of the oil pump and the cumulative working time of the oil pump to the design life time of the oil pump to obtain the corresponding remaining life value of the oil pump.

[0067] In order to more accurately evaluate and calculate the remaining life value of the oil pump, when recording the working time of the oil pump, it can also be done as follows: the range of the displacement control current value of the oil pump is divided into several displacement current intervals from small to large, and a positively correlated interval weight coefficient is set for each displacement current interval; the step of detecting the life parameters of the oil pump includes recording the cumulative working time of the oil pump in each displacement current interval, and accumulating the product of the cumulative working time of each interval and the corresponding interval weight coefficient to obtain the weighted cumulative working time of the oil pump; the step of calculating the remaining life value of the corresponding oil pump includes: calculating the ratio of the difference between the design life time of the oil pump and the weighted cumulative working time to the design life time of the oil pump to obtain the remaining life value of the corresponding oil pump.

[0068] In the present invention, only the life parameters of the first oil pump 11 can be detected, the remaining life value of the first oil pump 11 can be calculated, and in step S2, the displacement of the two pumps and the oil supply distribution valve 61 can be controlled based on the remaining life value of the first oil pump 11; or only the life parameters of the second oil pump 12 can be detected, the remaining life value of the second oil pump 12 can be calculated, and in step S2, the displacement of the two pumps and the oil supply distribution valve 61 can be controlled based on the remaining life value of the second oil pump 12; or the life parameters of the first oil pump 11 and the second oil pump 12 can be detected at the same time, the remaining life values ​​of the two oil pumps can be calculated, and in step S2, the displacement of the two pumps and the oil supply distribution valve 61 can be controlled based on the remaining life values ​​of the two oil pumps.

[0069] In step S2, when the remaining life value of the first oil pump 11 is used for control, the control strategy is as follows:

[0070] When the remaining life value X of the first oil pump 11 satisfies 0<X<a, the displacement of the first oil pump 11 is controlled to be minimum, the oil supply distribution valve 61 is controlled to open the oil supply line between the third main valve and the second oil pump 12, and the displacement of the second oil pump 12 is controlled according to the flow required by the hydraulic actuator controlled by the switching third main valve.

[0071] When the remaining life value of the first oil pump 11 is at X and satisfies b<X<1, the oil supply distribution valve 61 is controlled to cut off the oil supply line between the third main valve and the second oil pump 12 and control the displacement of the first oil pump 11 according to the flow required by the hydraulic actuator controlled by the switching third main valve.

[0072] When the remaining lifespan X of the first oil pump 11 satisfies a≤X≤b, the oil supply distribution valve 61 is controlled to open the oil supply line between the third main valve and the second oil pump 12, and the displacements of the first and second oil pumps 11, 12 are controlled based on the flow rate required by the hydraulic actuator controlled by the third main valve. When both pumps simultaneously supply oil to the third control main valve, they can be supplied with the same displacement control current, or with different displacement control currents based on their remaining lifespans, ensuring that each pump operates at its respective displacements to supply oil to the third main valve and meet its flow rate requirements.

[0073] The set values ​​a and b satisfy: 0<a<b<1.

[0074] In step S2, when the remaining life value of the second oil pump 12 is used for control, the control strategy is as follows:

[0075] When the remaining life value Y of the second oil pump 12 satisfies 0<Y<a, the oil supply distribution valve 61 is controlled to cut off the oil supply path between the third main valve and the second oil pump 12 and the displacement of the first oil pump 11 is controlled according to the flow required by the hydraulic actuator controlled by the third main valve;

[0076] When the remaining life value of the second oil pump 12 is at Y and satisfies b<Y<1, the displacement of the first oil pump 11 is controlled to be minimum, the oil supply distribution valve 61 is controlled to open the oil supply line between the third main valve and the second oil pump 12, and the displacement of the second oil pump 12 is controlled according to the flow required by the hydraulic actuator controlled by the third main valve;

[0077] When the remaining life span Y of the second oil pump 12 satisfies a≤Y≤b, the oil supply distribution valve 61 is controlled to open the oil supply line between the third main valve and the second oil pump 12, and the displacement of the first and second oil pumps 11, 12 are controlled based on the flow rate required by the hydraulic actuator controlled by the third main valve. When both pumps simultaneously supply oil to the third control main valve, they can be supplied with the same displacement control current, or with different displacement control currents based on their remaining life spans, ensuring that each pump operates at its respective displacement to supply oil to the third main valve and meet its flow rate requirements.

[0078] In step S2, when the remaining life values ​​of the first oil pump 11 and the second oil pump 12 are used for control at the same time, the control strategy is as follows:

[0079] In the hydraulic oil supply control method of the present invention, in step S2:

[0080] When the remaining life value X of the first oil pump 11 and the remaining life value Y of the second oil pump 12 are both greater than c, the output flow rate is Control the displacement of the first oil pump 11, according to the output flow rate Controlling the displacement of the second oil pump 12;

[0081] The setting value c range is 0.2<c<0.4; Q is the flow rate required for the hydraulic actuator controlled by the reversing third main valve to work.

[0082] The hydraulic oil supply control method described above is applied to an excavator. The first main valve includes a left travel control main valve 31 for controlling the left travel hydraulic motor, a boom control main valve 32 for controlling the boom cylinder, and an arm control main valve 33 for controlling the dipper cylinder. The second main valve includes a bucket control main valve 44 for controlling the bucket cylinder, an arm merging control main valve 43 connected to the output of the arm control main valve 33, a boom merging control main valve 42 connected to the output of the boom control main valve 32, and a right travel control main valve 41 for controlling the right travel hydraulic motor. The third main valve includes an attachment control main valve 51 for controlling the hydraulic actuators of the attachments and a swing control main valve 52 for controlling the swing motor.

[0083] The present invention also provides a control device, such as Figure 3 As shown, it includes a processor and a memory, wherein a control program is stored in the memory, and the control program is loaded and executed by the processor to implement the aforementioned hydraulic oil supply control method.

[0084] The present invention also provides an excavator, which has the aforementioned hydraulic oil supply control system, or has the aforementioned control device; the first main valve includes a left travel control main valve 31 for controlling the left travel hydraulic motor, a boom control main valve 32 for controlling the boom cylinder, and a dipper arm control main valve 33 for controlling the dipper arm cylinder; the second main valve includes a bucket control main valve 44 for controlling the bucket cylinder, a dipper arm confluence control main valve 43 connected to the output confluence of the dipper arm control main valve 33, and a boom confluence control main valve 42 connected to the output confluence of the boom control main valve 32; the third main valve includes an accessory control main valve 51 for controlling the hydraulic actuator of the accessory and / or a slewing control main valve 52 for controlling the slewing motor. The right travel control main valve 41 used to control the right travel hydraulic motor can serve as the second main valve, and its oil inlet end is connected to the pump port of the second oil pump 12; or the oil inlet end of the right travel control main valve 41 used to control the right travel hydraulic motor is connected to the oil supply distribution valve 61, and the oil supply distribution valve 61 selects the second oil pump 12 to be connected to the third main valve or to the right travel control main valve 41.

Claims

1. A hydraulic oil supply control system comprising a first oil pump, at least one first main valve, at least one third main valve, a second oil pump, and at least one second main valve having an oil inlet connected to the second oil pump, wherein the oil inlet of each of the first main valve and the third main valve is connected to the first oil pump, characterized in that: The control system also includes: The oil supply distribution valve is connected between the oil inlet end of the third main valve and the second oil pump, and is used to control the on-off of the oil supply line between the third main valve and the second oil pump; a detection device for detecting life parameters of the first oil pump and / or the second oil pump, wherein the life parameters can be used to calculate the remaining life value of the corresponding oil pump; The controller is used to calculate the remaining life value of the corresponding oil pump based on the life parameter, and control the displacement of each oil pump and the on-off of the oil supply distribution valve according to the remaining life value of the first oil pump and / or the second oil pump when the third main valve is switched.

2. The hydraulic oil supply control system according to claim 1, characterized in that: The detection device includes a swash plate angle sensor for detecting the actual swing angle of the oil pump swash plate; The controller is used to determine the theoretical swing angle of the swash plate of the corresponding oil pump based on the displacement control current of the corresponding oil pump, and calculate the remaining life value of the corresponding oil pump based on the ratio of the actual swing angle of the oil pump swash plate to the theoretical swing angle; the displacement control current is the displacement control current output by the controller to the corresponding oil pump when the swash plate angle sensor detects the actual swing angle of the oil pump swash plate.

3. The hydraulic oil supply control system according to claim 1, characterized in that: The detection device includes a timing module, which is used to record the cumulative working time of the oil pump when the displacement control current is greater than the set value. The controller is used to calculate the remaining life value of the corresponding oil pump based on the cumulative working time of the oil pump.

4. The hydraulic oil supply control system according to claim 1, characterized in that: The control system further comprises a flow demand input device electrically connected to the controller for inputting flow demand, and the controller is further configured to control the displacement of each oil pump according to the flow demand.

5. The hydraulic oil supply control system according to any one of claims 1 to 4, characterized in that: The control system further comprises at least one fourth main valve whose oil inlet end is connected to the oil supply distribution valve, and the oil supply distribution valve selectively connects the second oil pump to either the third main valve or the fourth main valve.

6. A hydraulic oil supply control method, characterized in that: The hydraulic oil supply control system used in the control method includes a first oil pump, at least one first main valve, at least one third main valve, a second oil pump, at least one second main valve whose oil inlet end is connected to the second oil pump, and an oil supply distribution valve for controlling the on-off of the oil supply line between the third main valve and the second oil pump. The oil inlet ends of each of the first main valve and the third main valve are connected to the first oil pump. The control method steps are as follows: Step S1: detecting life parameters of the first oil pump and / or the second oil pump; and calculating the remaining life value of the corresponding oil pump based on the life parameters; Step S2: When the third main valve is switched, the displacement of each oil pump and the on / off switching of the oil supply distribution valve are controlled according to the remaining life of the first oil pump and / or the second oil pump and the flow required by the hydraulic actuator controlled by the switching third main valve.

7. The hydraulic oil supply control method according to claim 6, characterized in that: The step of detecting the life parameter of the oil pump includes: detecting an actual swing angle of the oil pump swash plate and determining a theoretical swing angle of the swash plate using a displacement control current of the oil pump, wherein the displacement control current is a displacement control current output by a controller to a corresponding oil pump when a swash plate angle sensor detects the actual swing angle of the oil pump swash plate; and the step of calculating the remaining life value of the corresponding oil pump includes: calculating a ratio of the actual swing angle of the oil pump swash plate to the theoretical swing angle of the swash plate to obtain the remaining life value of the corresponding oil pump.

8. The hydraulic oil supply control method according to claim 6, characterized in that: The step of detecting the life parameters of the oil pump includes recording the cumulative working time of the oil pump when the displacement control current is greater than the set value; the step of calculating the remaining life value of the corresponding oil pump includes: calculating the ratio of the difference between the design life time of the oil pump and the cumulative working time of the oil pump to the design life time of the oil pump to obtain the corresponding remaining life value of the oil pump.

9. The hydraulic oil supply control method according to claim 6, characterized in that: The range of displacement control current values ​​recorded during the operation of the oil pump is divided into a plurality of displacement current intervals from small to large, and a positively correlated interval weight coefficient is set for each displacement current interval; the step of detecting the life parameter of the oil pump includes recording the cumulative operation time of the oil pump in each displacement current interval, and accumulating the product of the cumulative operation time of each interval and the corresponding interval weight coefficient to obtain the weighted cumulative operation time of the oil pump; The step of calculating the remaining life value of the corresponding oil pump includes: calculating the ratio of the difference between the design life time of the oil pump and the weighted cumulative working time to the design life time of the oil pump to obtain the remaining life value of the corresponding oil pump.

10. The hydraulic oil supply control method according to any one of claims 7 to 9, characterized in that: In step S2: When the remaining life value X of the first oil pump satisfies 0<X<a, the displacement of the first oil pump is controlled to be minimum, the oil supply distribution valve is controlled to open the oil supply line between the third main valve and the second oil pump, and the displacement of the second oil pump is controlled according to the flow required by the hydraulic actuator controlled by the third main valve; When the remaining life value of the first oil pump is at X and satisfies b<X<1, the oil supply distribution valve is controlled to cut off the oil supply path between the third main valve and the second oil pump and the displacement of the first oil pump is controlled according to the flow required by the hydraulic actuator controlled by the third main valve; When the remaining life value X of the first oil pump satisfies a≤X≤b, the oil supply distribution valve is controlled to open the oil supply line between the third main valve and the second oil pump and the displacement of the first oil pump and the second oil pump is controlled according to the flow required by the hydraulic actuator controlled by the switching third main valve; The set values ​​a and b satisfy: 0<a<b<1.

11. The hydraulic oil supply control method according to any one of claims 7 to 9, characterized in that: In step S2: When the remaining life value Y of the second oil pump satisfies 0<Y<a, the oil supply distribution valve is controlled to cut off the oil supply path between the third main valve and the second oil pump and the displacement of the first oil pump is controlled according to the flow required by the hydraulic actuator controlled by the switching third main valve; When the remaining life value of the second oil pump is at Y and satisfies b<Y<1, the displacement of the first oil pump is controlled to be minimum, the oil supply distribution valve is controlled to open the oil supply line between the third main valve and the second oil pump, and the displacement of the second oil pump is controlled according to the flow required by the hydraulic actuator controlled by the switching third main valve; When the remaining life value Y of the second oil pump satisfies a≤Y≤b, the oil supply distribution valve is controlled to open the oil supply line between the third main valve and the second oil pump and the displacement of the first oil pump and the second oil pump is controlled according to the flow required by the hydraulic actuator controlled by the switching third main valve; The set values ​​a and b satisfy: 0<a<b<1.

12. The hydraulic oil supply control method according to any one of claims 7 to 9, characterized in that: In step S2: When the remaining life value X of the first oil pump and the remaining life value Y of the second oil pump are both greater than c, the output flow rate is Control the displacement of the first oil pump according to the output flow rate Control the displacement of the second oil pump; The setting value c range is 0.2<c<0.4; The flow rate required for the hydraulic actuator controlled by the third main valve to work.

13. A control device comprising a processor and a memory, wherein a control program is stored in the memory, characterized in that: The control program is loaded and executed by the processor to implement the hydraulic oil supply control method according to any one of claims 6 to 12.

14. An excavator, characterized in that: The excavator has a hydraulic oil supply control system according to any one of claims 1 to 4; the first main valve includes a left travel control main valve for controlling the left travel hydraulic motor, a boom control main valve for controlling the boom cylinder, and a dipper arm control main valve for controlling the bucket cylinder; the second main valve includes a bucket control main valve for controlling the bucket cylinder, a dipper arm confluence control main valve connected to the dipper arm control main valve output confluence, and a boom confluence control main valve connected to the boom control main valve output confluence; the third main valve includes an accessory control main valve for controlling the hydraulic actuator of the accessory and / or a slewing control main valve for controlling the slewing motor.

15. The excavator according to claim 14, characterized in that The second main valve also includes a right travel control main valve for controlling the right travel hydraulic motor; or the oil inlet end of the right travel control main valve for controlling the right travel hydraulic motor is connected to the oil supply distribution valve, and the oil supply distribution valve selects the second oil pump to be connected to the third main valve or to the right travel control main valve.

16. An excavator, characterized in that: The excavator has the control device according to claim 13; the first main valve includes a left travel control main valve for controlling the left travel hydraulic motor, a boom control main valve for controlling the boom cylinder, and a dipper arm control main valve for controlling the dipper arm cylinder; the second main valve includes a bucket control main valve for controlling the bucket cylinder, a dipper arm confluence control main valve connected to the dipper arm control main valve output confluence, and a boom confluence control main valve connected to the boom control main valve output confluence; the third main valve includes an accessory control main valve for controlling the hydraulic actuator of the accessory and / or a slewing control main valve for controlling the slewing motor.

17. The excavator according to claim 16, characterized in that The second main valve also includes a right travel control main valve for controlling the right travel hydraulic motor; or the oil inlet end of the right travel control main valve for controlling the right travel hydraulic motor is connected to the oil supply distribution valve, and the oil supply distribution valve selects the second oil pump to be connected to the third main valve or to the right travel control main valve.

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