A control method and device for the oil pump of a marine parallel gearbox

Abstract

A marine parallel gearbox oil pump control method that optimally controls by collecting the lubricating oil inlet pressure and the gearbox speed, controlling the start and stop of the electric lubricating oil pump according to the lubricating oil pressure requirements at each operating point, achieving good lubrication effects, and at the same time taking into account energy conservation, noise reduction, and extending the service life of the equipment. The technical solution is as follows: It is characterized by including the following steps: Step S1; Control algorithm setting: Define the speed data range of each operating condition of the gearbox and the corresponding lubricating oil inlet pressure values for starting and stopping the electric lubricating oil pump at different speeds in the electric lubricating oil pump control device, and control the start and stop of the electric lubricating oil pump according to the lubricating oil inlet pressure and gearbox speed data; Step S2; Obtain the gearbox speed data and the lubricating oil inlet pressure value through the measurement module and the calculation module; Step S3: Use the electric lubricating oil pump control software to control the electric lubricating oil pump.

Description

Technical Field

[0001] The present invention belongs to the field of marine parallel gearbox oil pump control devices, and in particular to a marine parallel gearbox oil pump control device and a control method thereof, which can ensure that the gearbox operation achieves a good lubrication effect and achieves optimal control in terms of energy saving, noise reduction, and service life extension. Background Art

[0002] The marine gearbox is the main propulsion transmission device of the ship's power system. It has the functions of forward, reverse, clutch, deceleration, and bearing propeller thrust. It cooperates with the prime mover, shaft system, and propeller to form the ship's power system. Marine gearboxes are widely used in various types of ships. Since the marine gearbox transmits the propulsion power generated by the prime mover, lubricating oil is like its blood. The reasonable supply of lubricating oil is very important for the safe and stable operation of the equipment.

[0003] Marine oil pump control has gone through three stages of development. The first stage is manual control, where operators manually start and stop the oil pump based on observations of corresponding instruments and operating data and personal experience. The second stage is electrical hard-wired control. Usually, contactors are used in conjunction with sensors such as pressure switches to start the oil pump when the pressure is low and stop it when the pressure is high. The third stage is microcomputer (single-chip microcomputer, PLC, etc.) control. Complex control logic is achieved through pre-designed software programs, and network communication functions are available, allowing access to an integrated network.

[0004] The pump control system proposed in patent application No. 201210417274.1 minimizes energy consumption by making multiple pumps operate at the optimal efficiency point. The main method adopted is to store the operating characteristics of the pumps in a storage unit and achieve the optimal solution through real-time calculation to control the operation of each pump. However, there is an error between the operating characteristics and the actual operating values, so this control method has an error with the actual operation.

[0005] The pump control proposed in patent application No. 201410102984.4 discloses a method for configuring a driver to control the operation of a pump in a sewage system. By measuring the parameters of the sewage system, an operation algorithm for the driver to control the pump is created based on the measured values ​​of the parameters. This method of establishing an operation algorithm based on parameter measurements cannot fully reflect the actual operating conditions, so the control also has errors.

[0006] The control of the conventional gearbox electric lubricating oil pump, including the above-mentioned patent applications, adopts the combined control of a pressure switch and a contactor. By setting a pressure value for each of the low-pressure pressure switch and the high-pressure pressure switch, the contactor is driven to control the start and stop of the electric lubricating oil pump. This control method has a simple structure, a single control method, and relatively rough control. Since each pressure switch can only set one pressure value, it cannot well match the pressure values required for the full operating conditions of the gearbox. When encountering pressure pulsation, it may cause the electric lubricating oil pump to start and stop frequently, resulting in damage to the contactor or the motor.

[0007] When setting the pressure value of the pressure switch, the lubricating oil pressure requirements under the full operating conditions of the gearbox are usually considered. It is necessary to take into account the requirements of each operating condition. Usually, the low-pressure value (pump start pressure) is set relatively low, and the high-pressure value (pump stop pressure) is set relatively high. As a result, the operating frequency of the electric lubricating oil pump is very high, and the pressure values of the pipeline and pump body are maintained at high levels, which is not conducive to energy conservation, noise reduction, and extending the service life of the equipment.

[0008] The present invention is directed to a parallel-connected gearbox lubricating oil pump, which itself has a belt-driven lubricating oil pump and an electric lubricating oil pump. The belt-driven lubricating oil pump is mechanically connected to the gearbox shafting and rotates with it. The electric lubricating oil pump is driven by an electric motor and its start and stop are controlled according to the lubrication requirements.

[0009] Before the gearbox runs, it is necessary to turn on the electric lubricating oil pump in advance to supply lubricating oil. In medium and low operating conditions, due to the relatively low speed of the belt-driven pump, there is insufficient lubricating oil supply, and the electric lubricating oil pump is required to assist in supplying lubricating oil; when the lubricating oil supply of the belt-driven lubricating oil pump is sufficient in high operating conditions, the electric lubricating oil pump can be stopped to achieve the effect of energy conservation and noise reduction; when the lubricating oil inlet pressure is insufficient due to a fault of the belt-driven pump during the operation of the gearbox, the electric lubricating oil pump starts quickly to supply lubricating oil.

[0010] The common point of the present invention and the above patents is to identify the state and seek an optimized control method; the difference is that the disclosed control method adopts a parameter-configurable method. By collecting the lubricating oil inlet pressure and the gearbox speed, the start and stop of the electric lubricating oil pump are controlled according to the lubricating oil pressure requirements at each operating condition point, achieving a good lubricating effect, while taking into account the requirements of energy conservation, noise reduction, and extending the service life of the equipment. Adopting a control method according to the operating conditions, an open network interface can be used for other various control scenarios and applications. Summary of the Invention

[0011] The present invention solves the technical problem that the control of the electric lubricating oil pump of the gearbox in the prior art is extensive and cannot well match the actual full working condition operation state requirements of the gearbox, resulting in improper control and damage to the motor. The present invention provides a marine parallel-connected gearbox oil pump control method and device that adopt a parameter-configurable method, collect the lubricating oil inlet pressure and the gearbox speed, and control the start and stop of the electric lubricating oil pump according to the lubricating oil pressure requirements at each working condition point, achieving a good lubrication effect, and at the same time taking into account energy saving, noise reduction, and extending the service life of the equipment to achieve optimal control.

[0012] The technical solution of the present invention is as follows:

[0013] 1. A control method for a marine parallel-connected gearbox oil pump, characterized by including the following steps:

[0014] Step S1; Control algorithm setting: Define the speed data range of each working condition of the gearbox and the lubricating oil inlet pressure values corresponding to the start and stop of the electric lubricating oil pump at different speeds in the electric lubricating oil pump control device, and control the start and stop of the electric lubricating oil pump according to the lubricating oil inlet pressure and gearbox speed data;

[0015] Step S2; Install the sensors of the electric lubricating oil pump control device on the gearbox rotating shaft and the lubricating oil inlet of the electric lubricating oil pump, and obtain the gearbox speed data and the lubricating oil inlet pressure value through the measurement module and the calculation module;

[0016] Step S3: Use the electric lubricating oil pump control software to control the electric lubricating oil pump: The control device reads the gearbox speed data and the lubricating oil inlet pressure data, and controls the start and stop of the electric lubricating oil pump according to the set control algorithm.

[0017] The determination of the speed data range of each working condition of the gearbox and the pressure values corresponding to the start and stop of the electric lubricating oil pump at different speeds in the step S1 includes the following steps: (1) Speed division points: That is, select the boundary point between the low working condition area and the high working condition area, and at least one speed boundary point is selected in the high working condition area; (2) When it is the boundary point between the low working condition area and the high working condition area of the speed, the electric lubricating oil pump maintains the starting state, and corresponding start pump pressures and stop pump pressures are set for other boundary points respectively; (3) Taking the speed as the abscissa and the pressure as the ordinate, connect the start pump pressure points and stop pump pressure points in the step (2) with straight lines to form a linear control curve of the electric lubricating oil pump, and the start pump and stop pump pressure values of the electric lubricating oil pump at different speeds of the gearbox can be obtained according to this curve.

[0018] In the step of dividing the rotational speed points, the demarcation point between the low operating condition area and the high operating condition area is preferably selected as the rotational speed of the gearbox being 80 RPM, and the demarcation points within the high operating condition area are preferably the rotational speeds of the gearbox being 100 RPM, 200 RPM, and 250 RPM; when the rotational speed of the gearbox is 80 RPM, the pump starting pressure is 0.06 Mpa and the pump stopping pressure is 0.1 Mpa; when the rotational speed of the gearbox is 100 RPM, the pump starting pressure is 0.08 Mpa and the pump stopping pressure is 0.16 Mpa; when the rotational speed of the gearbox is 200 RPM, the pump starting pressure is 0.4 Mpa and the pump stopping pressure is 0.5 Mpa; when the rotational speed of the gearbox is 250 RPM, the pump starting pressure is 0.4 Mpa and the pump stopping pressure is 0.5 Mpa.

[0019] It further includes the following steps:

[0020] The electric lubricating oil pump control device configures the parameters of the linear control curve through a visual parameter configuration software, and the configured parameters include: pump starting pressure judgment period, pump stopping pressure judgment period, pump starting delay, and pump stopping delay.

[0021] It further includes the following steps: pump starting delay and pump stopping delay.

[0022] It further includes the following steps: when the rotational speed is in the high operating condition area, when the lubricating oil pressure is continuously lower than the pump starting pressure for 2 seconds, directly start the electric lubricating oil pump, and when the lubricating oil pressure is continuously higher than the pump stopping pressure for 5 seconds, delay for 30 seconds to stop the pump.

[0023] A control device for a control method of a marine parallel-connected gearbox oil pump, comprising a control box body (1), characterized in that an oil pump controller (5) is installed inside the control box body (1). The oil pump controller (5) includes a main controller housing (6), a substrate (7) and a CPU board (8). An MCU and its driving circuit are provided on the CPU board (8). The substrate (7) is provided with a power module and a wiring socket. The CPU board (8) and the substrate (7) are connected by a connecting member. The MCU software part (100) includes a driving unit (101), a task creation unit (102), a cooperative multitasking scheduler (103), a configuration unit (104) and a control unit (105). The driving unit (101) includes a software platform layer driving and a bottom-layer hardware driving. The task creation unit (102) includes an IO task creation, an interrupt task creation, a network task creation, a watchdog task creation, a control algorithm task creation, and a process error handling task creation. The cooperative multitasking scheduler (103) is a scheduler written in a software architecture based on a time-triggered design pattern, capable of obtaining a cooperative multitasking operating system. After the scheduler is triggered by an event in a task, it traverses the task block linked list and executes the tasks to be scheduled according to the priorities of the tasks. The configuration unit (104) configures and modifies parameters to implement the corresponding functions under these parameters. The parameters include network nodes, digital inputs, ratio coefficients, speed-pressure curves. The speed-pressure curves include speed breakpoints, pump-stop breakpoint pressures, pump-start breakpoint pressures, start pressure judgment periods, and stop pressure judgment periods. The control unit (105) includes an acquisition module for real-time acquisition and calculation of the lubricating oil inlet pressure and the gearbox speed signal, a signal control output module for real-time control of the start and stop of the electric lubricating oil pump, a message receiving and sending module for CAN bus communication, an EEPROM reading and writing module, and a gearbox lubricating oil pressure control algorithm module.

[0024] The MCU chip selects the GD32F407 microcontroller chip based on the Cortex-M4 core of GigaDevice Semiconductor Inc., and uses the ADC, PWM, CAN and GPIO ports on the chip to implement input and output functions. The parameters further include current parameters. The digital parameters include normally open and normally closed, and delay times. The delay times include start delay and stop delay.

[0025] A control box door (2) is provided on the control box body (1), and a metal wiring cable head (3) is installed at the lower end of the control box body (1). A stuffing box (4) is installed in the metal wiring cable head (3).

[0026] The external interfaces of the oil pump controller (5) include: a power interface, 2 PWM input channels, 2 current input channels, 4 digital input channels, 4 digital output channels, 2 CAN bus communications, 4 LED indication outputs, and a JTAG interface.

[0027] A plastic film (9) is provided on the main controller housing (6) of the oil pump controller (5).

[0028] The time-triggered design pattern of the collaborative multi-task scheduler is a timer interrupt task shared among different tasks, and the interrupt response function is a time segment event with a time interval of 10 ms.

[0029] The connecting member between the CPU board (8) and the substrate (7) is a pin.

[0030] The algorithm in the gearbox lubricating oil pressure control algorithm module is as follows: according to the lubricating oil inlet pressure and the gearbox speed signal, when the speed of the gearbox shafting is in the low operating condition area, the electric lubricating oil pump starts to operate, and the lubricating oil pump will keep running in this shafting speed section; when the shafting speed is in the high operating condition area, the start and stop of the electric lubricating oil pump are controlled according to the speed-pressure curve.

[0031] Preferably, the demarcation point between the low operating condition area and the high operating condition area is the gearbox speed of 80 RPM.

[0032] The effect of the present invention is as follows: A control method for a marine parallel-connected gearbox oil pump includes the following steps: control algorithm setting: defining in the control device the speed data range of each operating condition of the gearbox and the lubricating oil inlet pressure values corresponding to the start and stop of the electric lubricating oil pump at different speeds, and controlling the start and stop of the electric lubricating oil pump according to the lubricating oil inlet pressure and the gearbox speed data; installing the sensors of the control device at the gearbox rotating shaft and the lubricating oil inlet of the electric lubricating oil pump, and obtaining the gearbox speed data and the lubricating oil inlet pressure values through the measurement module and the calculation module; controlling the electric lubricating oil pump by using the control software: the control device reads the gearbox speed signal and the lubricating oil inlet pressure data, and controls the start and stop of the electric lubricating oil pump according to the set control algorithm.

[0033] The pump control method of the present invention accurately controls the start and stop of the electric lubricating oil pump in combination with the real-time operating conditions of the gearbox. Compared with simply controlling by judging the lubricating oil pressure, it becomes more accurate, flexible and scientific in control. By controlling the start and stop of the electric lubricating oil pump according to the lubricating oil pressure requirements at each operating condition point, it can not only achieve a good lubrication effect, but also take into account the requirements of energy conservation, noise reduction and extension of the equipment service life to achieve optimal control.

[0034] The control method of the present invention further includes the steps of pump start delay and pump stop delay. By setting the delay, the technical problem of motor damage caused by improper control is avoided.

[0035] Marine parallel operation gearbox oil pump control device, including a control box body, an oil pump controller is installed inside the control box body. The oil pump controller includes a main controller housing, a substrate and a CPU board. An MCU and its driving circuit are provided on the CPU board. A power module and a wiring socket are provided on the substrate. The CPU board and the substrate are connected through a connecting piece. The software part of the MCU includes a driving unit, a task creation unit, a cooperative multitasking scheduler, a configuration unit and a control unit.

[0036] In this lubricating oil pump control device, due to the hardware setting of the oil pump controller and the CAN control bus with configurable data messages, and the software part in the oil pump controller is provided with a task creation unit, a cooperative multitasking scheduler, a configuration unit and a control unit. By configuring network nodes, digital inputs, ratio coefficients, speed-pressure curve parameters, and creating each task, the cooperative multitasking scheduler can perform multitasking cooperation and execute priority tasks, including the control unit collecting the operating speed of the gearbox and the lubricating oil pressure, and accurately controlling the start and stop of the electric lubricating oil pump under this working condition according to the lubricating oil inlet pressure demand corresponding to the speed according to the setting or the speed-pressure curve, that is, by collecting the lubricating oil inlet pressure and the gearbox speed and controlling the start and stop of the electric lubricating oil pump according to the lubricating oil pressure demand at each actual operating condition point, achieving a good lubrication effect, and at the same time meeting the requirements of energy saving, noise reduction and extending the service life of the equipment.

[0037] The pump control device of the present invention has good actual application effects in the control of the electric lubricating oil pump of the gearbox, has great practical application value, and has also been equipped on many ships. In the actual application process, because this device has rich interfaces and a wide range of available applications, for situations that meet the interface requirements and similar control scenarios, only parameter configuration is required to use it. A set of hardware and software has strong applicability, greatly saving the development cost and improving the utilization rate. For situations that meet the interface requirements and different control scenarios, the control effect can also be achieved by modifying some programs. Generally speaking, the equipment has strong adaptability. By developing a set of equipment with a wide range of applications and a high application rate, this one-time development and multi-scenario application greatly reduce the development cost.

[0038] The oil pump control module of the present invention is configured with a CAN bus interface and can communicate with external devices. The data messages of the CAN bus interface are configurable, which can realize the individual control of a pump control device, the combined control of multiple pump control devices, and can also communicate with other network devices to achieve network control. More complex algorithm control in other scenarios can be realized through the transplantation and modification of the controller program. The start and stop pump pressure values and start and stop pump delay values for each working condition can be configured through the CAN bus, and the values are stored in the EEPROM of the controller. The CAN bus can be connected to the debugging software to facilitate equipment debugging and maintenance.

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Description of the Drawings

[0040] Figure 1 is a flowchart of the control method of the present invention;

[0041] Figure 2 is the pressure control curve of the electric lubricating oil pump of the gearbox of the present invention;

[0042] Figure 3 is a schematic structural diagram of the pump control device of the present invention;

[0043] Figure 4 is a schematic structural diagram of the oil pump controller of the present invention;

[0044] Figure 5 is Figure 3 the top view of;

[0045] Figure 6 is a block diagram of the software part modules of the MCU of the present invention;

[0046] Figure 7 is an external circuit interface diagram of the oil pump controller PCM2010 of the present invention;

[0047] Figure 8 is the J5 interface diagram of the oil pump controller PCM2010 of the present invention;

[0048] Figure 9 is the J4 interface diagram of the oil pump controller PCM2010 of the present invention;

[0049] Figure 10 is the J6 interface diagram of the oil pump controller PCM2010 of the present invention;

[0050] Figure 11 is the J7 interface diagram of the oil pump controller PCM2010 of the present invention;

[0051] Figure 12 is the hardware interface diagram of the oil pump controller PCM2010 of the present invention;

[0052] Figure 13 is the software architecture diagram of the oil pump controller PCM2010 of the present invention;

[0053] Figure 14 is the software flowchart of the oil pump controller PCM2010 of the present invention. Specific Embodiments

[0054] Figure 1 In a control method of a marine parallel-connected gearbox oil pump control device, the following steps are included:

[0055] Step S1; Control algorithm setting: Define the rotational speed data range of each working condition of the gearbox and the lubricating oil inlet pressure values corresponding to the start and stop of the electric lubricating oil pump at different rotational speeds in the electric lubricating oil pump control device. Control the start and stop of the electric lubricating oil pump according to the lubricating oil inlet pressure and the gearbox rotational speed data;

[0056] Step S2; Install the sensors of the electric lubricating oil pump control device on the gearbox rotating shaft and the lubricating oil inlet of the electric lubricating oil pump, and obtain the gearbox rotational speed data and the lubricating oil inlet pressure value through the measurement module and the calculation module;

[0057] Step S3: Control the electric lubricating oil pump by using the electric lubricating oil pump control software: The control device reads the gearbox rotational speed data and the lubricating oil inlet pressure data, and controls the start and stop of the electric lubricating oil pump according to the set control algorithm.

[0058] The determination of the rotational speed data range of each working condition of the gearbox and the pressure values corresponding to the start and stop of the electric lubricating oil pump at different rotational speeds in Step S1 includes the following steps: (1) Rotational speed demarcation points: That is, select the demarcation point between the low working condition area and the high working condition area, and select at least one rotational speed demarcation point in the high working condition area; (2) When the rotational speed is at the demarcation point between the low working condition area and the high working condition area, the electric lubricating oil pump maintains the starting state, and set the corresponding start pump pressure and stop pump pressure for other demarcation points respectively; (3) Take the rotational speed as the abscissa and the pressure as the ordinate, connect each start pump pressure point and stop pump pressure point in Step (2) with a straight line to form a linear control curve of the electric lubricating oil pump. The start and stop pump pressure values of the electric lubricating oil pump at different rotational speeds of the gearbox can be obtained according to this curve.

[0059] In the rotational speed demarcation point step, it is preferred that the demarcation point between the low working condition area and the high working condition area is the gearbox rotational speed of 80 RPM, and the demarcation points in the high working condition area are preferably the gearbox rotational speeds of 100 RPM, 200 RPM, and 250 RPM; when the gearbox rotational speed is 80 RPM, the start pump pressure is 0.06 Mpa and the stop pump pressure is 0.1 Mpa; when the gearbox rotational speed is 100 RPM, the start pump pressure is 0.08 Mpa and the stop pump pressure is 0.16 Mpa; when the gearbox rotational speed is 200 RPM, the start pump pressure is 0.4 Mpa and the stop pump pressure is 0.5 Mpa; when the gearbox rotational speed is 250 RPM, the start pump pressure is 0.4 Mpa and the stop pump pressure is 0.5 Mpa.

[0060] It further includes the following steps:

[0061] The electric lubricating oil pump control device configures the parameters of the linear control curve through the visual parameter configuration software. The configured parameters include: pump start pressure judgment period, pump stop pressure judgment period, pump start delay, pump stop delay.

[0062] Pump start delay and pump stop delay. Preferably, when the rotational speed is in the high operating condition area, when the lubricating oil pressure is continuously lower than the pump starting pressure for 2 seconds, the electric lubricating oil pump is directly started. When the lubricating oil pressure is continuously higher than the pump stopping pressure for 5 seconds, the pump is stopped with a 30-second delay. (See Figure 2 ).

[0063] Figure 2 In Figure 2 , for the control curve setting of the electric lubricating oil pump, up to 4 control curves can be set in the program. Each curve is set as a broken line, with up to 16 breakpoints. At the same time, for each breakpoint of each curve, a pressure judgment period (jitter elimination time) and a delay time can be set. The current input signal can set the range and coefficient. The range represents the maximum measurement range corresponding to the current, and the ratio coefficient stores the corresponding relationship between the stored value and the actual value (for example, the pressure range is 1.00 MPa with two decimal places and the ratio is 100). The PWM signal parameters correspond to the number of teeth and the ratio coefficient.

[0064] Actually, 2 control curves are used in this device. Each curve uses 4 breakpoints. The horizontal axis of each curve is the rotational speed, and the vertical axis is the lubricating oil pressure.

[0065] By setting parameters, the pump control device is configured. After the pump control device is powered on, it starts to work and operates according to the established program. It collects rotational speed signals, lubricating oil pressure signals, and automatic / manual signals through channels. When in manual mode, the controller only collects channel signals and does not send lubricating oil pump control signals. When in automatic mode, it controls the electric lubricating oil pump of the gearbox according to the established program. When the rotational speed is lower than 80 RPM, the electric lubricating oil pump maintains the starting state. When the rotational speed is greater than 80 RPM, when the lubricating oil pressure is continuously lower than the pump starting pressure for 2 seconds, the electric lubricating oil pump is started. When the lubricating oil pressure is continuously higher than the pump stopping pressure for 5 seconds, the pump is stopped with a 30-second delay.

[0066] The lubricating oil pressure of the gearbox is supplied according to the operating conditions of the gearbox. It changes from the original constant pressure control to on-demand supply control according to the operating conditions, ensuring good lubrication effects in all operating conditions of the gearbox. The running time of the electric lubricating oil pump is greatly reduced, achieving the purpose of energy conservation and noise reduction. At the same time, the pipeline valve pressure does not need to be maintained at a high pressure value all the time, greatly extending the service life of the equipment.

[0067] Figure 3 In , a marine parallel-connected gearbox oil pump control device includes a control box body 1. An oil pump controller 5 is installed inside the control box body 1. A control box door 2 is provided on the control box body 1. A metal wiring cable head 3 is installed at the lower end of the control box body 1, and a stuffing box 4 is installed in the metal wiring cable head 3.

[0068] Figure 4Among them, the oil pump controller 5 includes a main controller housing 6, a substrate 7, and a CPU board 8. An MCU and its driving circuit are provided on the CPU board 8. A power module and wiring sockets (power socket J5, CAN bus socket J4, input terminal J6, output terminal J7) are provided on the substrate 7. The power socket supplies power to the controller. The CAN bus interface can configure the controller parameters and communicate with external devices. The input terminal collects external input signals, and the output terminal outputs control signals. The CPU board 8 and the substrate 7 are connected by a connecting member, and the connecting member between the CPU board 8 and the substrate 7 is a pin. A plastic film 9 is provided on the main controller housing 6 of the oil pump controller 5 (see Figure 5 ).

[0069] Figure 6 Among them, the MCU software 100 part includes a driving unit 101, a task creation unit 102, a cooperative multitasking scheduler 103, a configuration unit 104, and a control unit 105. The driving unit 101 includes a software platform layer driver and a bottom-layer hardware driver; the task creation unit 102 includes IO task creation, interrupt task creation, network task creation, watchdog task creation, control algorithm task creation, and process error handling task creation; the cooperative multitasking scheduler 103 is a scheduler written for a software architecture based on a time-triggered design pattern, which can obtain a cooperative multitasking operating system. After the scheduler is triggered by an event in a task, it traverses the task block linked list and executes the tasks to be scheduled according to the priorities of the tasks; the configuration unit 104 configures and modifies parameters to implement the corresponding functions under these parameters. The parameters include network nodes, digital inputs, ratio coefficients, speed-pressure curves. The speed-pressure curve includes speed breakpoints, stop pump breakpoint pressures, start pump breakpoint pressures, start pressure judgment periods, and stop pressure judgment periods; the control unit 105 includes a signal acquisition module for collecting the lubricating oil inlet pressure and the gearbox speed, a signal output module for real-time controlling the start and stop of the electric lubricating oil pump with digital quantities, a CAN bus message receiving and sending module, an EEPROM reading and writing module, and a gearbox lubricating oil pressure control algorithm module.

[0070] The time-triggered design pattern of the cooperative multitasking scheduler is a timer interrupt task shared among different tasks, and the interrupt response function is a time segment event with a time interval of 10 ms.

[0071] The algorithm in the gearbox lubricating oil pressure control algorithm module is as follows: when the rotational speed of the gearbox shafting is lower than 80 RPM, the electric lubricating oil pump immediately starts to run, and the lubricating oil pump will keep running in this shafting speed section; when the shafting speed is greater than 80 RPM, the start and stop of the electric lubricating oil pump are controlled according to the speed-pressure curve.

[0072] The MCU chip selects the GD32F407 microcontroller chip of GigaDevice based on the Cortex-M4 core, and uses the ADC, PWM, CAN and GPIO ports on the chip to realize input and output functions; the parameters also include current parameters, and the switch quantity parameters include normally open and normally closed, delay time, and the delay time includes start delay and stop delay.

[0073] Figure 7 Among them, interface 1 and interface 2 of J5 terminal are power interfaces; the 4 interfaces of J4 terminal are two-way CAN bus interfaces; the 12 interfaces of J6 terminal are 4 relay interfaces. Among the 16 interfaces of J7 terminal, interfaces 1 to 4 are two-way current interfaces, interfaces 5 - 12 are 4-way switch interfaces, and interfaces 13 to 16 are two-way frequency interfaces (see Figure 8 、 Figure 9 、 Figure 10 and Figure 11 ) specifically.

[0074] Figure 12 Among them, the external interfaces of the oil pump controller 2 include: power interface, 2 PWM input channels, 2 current input channels, 4 switch quantity input channels, 4 switch quantity output channels, 2-way CAN bus communication, 4 LED indication outputs, and JTAG interface.

[0075] The parameter configuration of the controller includes network node setting. The PWM parameter setting includes range setting and ratio coefficient setting. The 4 - 20mA current parameter setting includes range setting and ratio setting. The switch quantity input includes normally open and normally closed setting and delay time setting. The linear curve setting includes speed breakpoints, pump stop breakpoint pressure, pump start breakpoint pressure, start pressure judgment period, stop pressure judgment period, start delay, and stop delay. The network parameter setting includes packet number and data position setting.

[0076] Figure 14 Among them, the working steps of the controller software are as follows: after the controller is powered on, it first completes initialization, including hardware initialization, parameter initialization, interrupt initialization, and scheduling initialization. Creating tasks mainly includes creating IO tasks, interrupt tasks, network tasks, watchdog tasks, control algorithm tasks, and process error handling tasks. Subsequently, it enters the task scheduler polling process and continuously calls each task according to the set scheduling time.

[0077] The software design is divided into the following three parts:

[0078] 1) The drivers related to the underlying hardware in the software platform layer are mainly the drivers of the chip GD32F407, including reset circuit, CAN driver, WDT driver, TIMER driver, ADC driver, PWM driver, etc.

[0079] 2) The collaborative multitask scheduler mainly completes tasks such as scheduler initialization, creating multitasks, multitask execution, multitask destruction, and scheduler startup;

[0080] 3) The design of the controller application program includes real-time acquisition of current signals, PWM signals, and digital input signals, real-time control of digital signal output, CAN bus message reception and transmission, EEPROM reading and writing, and the gearbox lubricating oil pressure control algorithm.

[0081] After the controller is powered on, it first completes initialization, including hardware initialization, parameter initialization, interrupt initialization, and scheduling initialization. Creating tasks mainly includes creating IO tasks, interrupt tasks, network tasks, watchdog tasks, control algorithm tasks, and process error handling tasks. Subsequently, it enters the task scheduler polling process and continuously calls each task according to the set scheduling time. For the specific software framework diagram, please refer to Figure 13 .

[0082] In actual application, the oil pump controller is powered by a 24VDC power supply. The communication protocol is CAN2.0B, baud rate: 100Kbps, 2 batches of data are sent per second, and the maximum communication transmission distance is 600 meters; mechanical dimensions: length × width × height = 130mm × 105mm × 61mm; operating environment temperature: -10°C to 55°C.

[0083] One 24V power signal is connected to the 24V power supply to power the device; one current input signal is connected to the gearbox lubricating oil inlet pressure signal; one frequency input signal is connected to the gearbox rotation speed signal; one digital signal is connected to the automatic / manual signal; one digital output signal controls the startup of the gearbox electric lubricating pump; one digital output signal controls the stop of the gearbox electric lubricating pump; two CAN buses are used for connection during debugging.

Claims

1. A control method for the oil pump of a marine parallel-connected gearbox, characterized in that it includes the following steps: Step S1; Control algorithm setting: Define the rotational speed data range of each working condition of the gearbox and the lubricating oil inlet pressure values corresponding to the start and stop of the electric lubricating oil pump at different rotational speeds in the electric lubricating oil pump control device. According to the lubricating oil inlet pressure and the gearbox rotational speed data, control the start and stop of the electric lubricating oil pump; Step S2; Install the sensors of the electric lubricating oil pump control device on the gearbox rotating shaft and the lubricating oil inlet of the electric lubricating oil pump, and obtain the gearbox rotational speed data and the lubricating oil inlet pressure values through the measurement module and the calculation module; Step S3: Control the electric lubricating oil pump by using the electric lubricating oil pump control software: The control device reads the gearbox rotational speed data and the lubricating oil inlet pressure data, and controls the start and stop of the electric lubricating oil pump according to the set control algorithm; The determination of the rotational speed data range of each working condition of the gearbox and the pressure values corresponding to the start and stop of the electric lubricating oil pump at different rotational speeds in the said Step S1 includes the following steps: (1) Rotational speed segmentation points: That is, select the demarcation point between the low working condition area and the high working condition area, and select at least one rotational speed demarcation point in the high working condition area; (2) When at the demarcation point between the low working condition area and the high working condition area of the rotational speed, the electric lubricating oil pump maintains the starting state, and set the corresponding start pump pressure and stop pump pressure for other demarcation points respectively; (3) Use the rotational speed as the abscissa and the pressure as the ordinate, connect the start pump pressure points and stop pump pressure points in Step (2) with straight lines to form the linear control curve of the electric lubricating oil pump. According to this curve, the start pump and stop pump pressure values of the electric lubricating oil pump at different rotational speeds of the gearbox can be obtained.

2. The control method for the oil pump of a marine parallel-connected gearbox according to Claim 1, characterized in that the in the rotational speed segmentation point step, select the demarcation point between the low working condition area and the high working condition area as the gearbox rotational speed of 80 RPM, and the demarcation points in the high working condition area are the gearbox rotational speeds of 100 RPM, 200 RPM, and 250 RPM; when the gearbox rotational speed is 80 RPM, the start pump pressure is 0.06 Mpa and the stop pump pressure is 0.1 Mpa; when the gearbox rotational speed is 100 RPM, the start pump pressure is 0.08 Mpa and the stop pump pressure is 0.16 Mpa; when the gearbox rotational speed is 200 RPM, the start pump pressure is 0.4 Mpa and the stop pump pressure is 0.5 Mpa; when the gearbox rotational speed is 250 RPM, the start pump pressure is 0.4 Mpa and the stop pump pressure is 0.5 Mpa.

3. The control method for the oil pump of a marine parallel-connected gearbox according to Claim 1 or 2, characterized in that it further includes the following steps: The electric lubricating oil pump control device configures the parameters of the linear control curve through the visual parameter configuration software. The configured parameters include: pump start pressure judgment period, pump stop pressure judgment period, pump start delay, and pump stop delay.

4. The control method for the oil pump of a marine parallel-connected gearbox according to Claim 3, characterized in that it further includes the following steps: pump start delay and pump stop delay.

5. The control method for the oil pump of a marine parallel-connected gearbox according to Claim 4, characterized in that It also includes the following steps: when the rotational speed is in the high operating condition area, when the lubricating oil pressure is lower than the pump starting pressure for 2 consecutive seconds, directly start the electric lubricating oil pump; when the lubricating oil pressure is higher than the pump stopping pressure for 5 consecutive seconds, stop the pump after a 30-second delay.

6. A control device applicable to the oil pump control method of the marine parallel-connected gearbox according to any one of the above claims 1 - 5, including a control box body (1), characterized in that an oil pump controller (5) is installed inside the control box body (1). The oil pump controller (5) includes a main controller housing (6), a substrate (7), and a CPU board (8). An MCU and its driving circuit are provided on the CPU board (8). The substrate (7) is provided with a power module and a wiring socket. The CPU board (8) and the substrate (7) are connected through a connecting piece; the software part (100) of the MCU includes a driving unit (101), a task creation unit (102), a cooperative multitasking scheduler (103), a configuration unit (104), and a control unit (105). The driving unit (101) includes a software platform layer driving and a bottom-layer hardware driving; the task creation unit (102) includes an IO task creation, an interrupt task creation, a network task creation, a watchdog task creation, a control algorithm task creation, and a process error handling task creation; the cooperative multitasking scheduler (103) is a scheduler written based on the time-triggered design pattern software architecture, capable of obtaining a cooperative multitasking operating system, so that after the scheduler is triggered by an event in the task, it traverses the task block linked list and executes the tasks to be scheduled according to the priorities of the tasks; the configuration unit (104) configures and modifies parameters to achieve the corresponding functions under these parameters. The parameters include network nodes, digital inputs, ratio coefficients, rotational speed - pressure curves. The rotational speed - pressure curve includes rotational speed break points, pump stopping break point pressures, pump starting break point pressures, starting pressure judgment periods, and stopping pressure judgment periods; the control unit (105) includes an acquisition module for real-time acquisition and calculation of the lubricating oil inlet pressure and the gearbox rotational speed signal, a signal control output module for real-time control of the starting and stopping of the electric lubricating oil pump, a message receiving and sending module for CAN bus communication, an EEPROM reading and writing module, and a gearbox lubricating oil pressure control algorithm module.

7. The control device according to claim 6, characterized in that the chip of the MCU selects a GD32F407 microcontroller chip based on the Cortex - M4 kernel, and uses the ADC, PWM, CAN, and GPIO ports on the chip to implement input and output functions; the parameters further include current parameters. The digital inputs include normally open and normally closed, and delay times. The delay times include starting delay and stopping delay.

8. The control device according to claim 6 or 7, characterized in that a control box door (2) is provided on the control box body (1), and a metal wiring cable head (3) is installed at the lower end of the control box body (1). A stuffing box (4) is installed in the metal wiring cable head (3).

9. The control device according to claim 6, characterized in that The external interfaces of the oil pump controller (5) include: a power interface, 2 PWM input channels, 2 current input channels, 4 digital input channels, 4 digital output channels, 2 CAN bus communications, 4 LED indication outputs, and a JTAG interface.

10. The control device according to claim 6, wherein a plastic film (9) is provided on the main controller housing (6) of the oil pump controller (5).

11. The control device according to claim 6, wherein the time-triggered design mode of the cooperative multi-task scheduler is a timer interrupt task shared among different tasks, and the interrupt response function is a time segment event with a time interval of 10 ms.

12. The control device according to claim 6, wherein the connector between the CPU board (8) and the substrate (7) is a pin.

13. The control device according to claim 6, wherein the algorithm in the gearbox lubricating oil pressure control algorithm module is: according to the lubricating oil inlet pressure and the gearbox speed signal, when the gearbox shafting speed is in the low operating condition area, the electric lubricating oil pump starts to operate, and the lubricating oil pump will keep running in this shafting speed section; when the shafting speed is in the high operating condition area, the start and stop of the electric lubricating oil pump are controlled according to the speed-pressure curve.

14. The control device according to claim 13, wherein the demarcation point between the low operating condition area and the high operating condition area is a gearbox speed of 80 RPM.

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