A monorail crane vehicle power matching control method and device and a storage medium

Abstract

The application discloses a monorail crane vehicle power matching control method and device and a storage medium. The method comprises the following steps: acquiring the engine speed, the engine output torque, the output pressure and the output flow of a main pump; calculating the load torque according to the engine speed, the output pressure and the output flow of the main pump to obtain the ratio of the load torque to the engine output torque; when the ratio of the load torque to the engine output torque is less than a set value, increasing the operation handle amplitude, increasing the input current of the proportional pressure reducing valve, and increasing the displacement of the main pump; when the ratio of the load torque to the engine output torque is greater than the set value, increasing the operation handle amplitude, executing the input current reduction of the proportional pressure reducing valve by the over-ride control module, and reducing the displacement of the main pump. The application changes the displacement of the main pump to realize that the load torque is lower than the engine output torque and maintains a certain ratio, avoids the phenomenon that the engine speed is too high, black smoke is generated and the like caused by the excessively large load torque, and finally realizes the best matching of the monorail crane power system.

Description

Technical Field

[0001] This invention relates to the field of monorail technology, specifically to a method, device, and storage medium for power matching control of a monorail locomotive. Background Technology

[0002] With the development of the coal industry, monorail locomotives are increasingly widely used in coal mines. However, existing monorail locomotives commonly suffer from problems such as speed loss during heavy-load uphill climbing and black smoke from the engine. This is because the load consumption exceeds the engine output. For monorail locomotives, load consumption mainly includes consumption from the closed-loop piston pump, auxiliary system consumption, and engine accessory consumption. Among these, the consumption from the auxiliary system and engine accessory consumption only varies with engine speed. The consumption of the closed-loop piston pump is related to engine speed and the output pressure of the control proportional valve. However, current technology lacks a control method to ensure that load consumption is always lower than engine output, which can easily lead to the load torque exceeding the engine output torque, resulting in problems such as engine speed loss and black smoke. Alternatively, the design may have a large margin for engine torque output, resulting in wasted engine capacity. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method, device, and storage medium for power matching control of a monorail crane. This method enables the monorail crane locomotive to adjust the displacement of the closed-loop piston pump according to the load size during operation, thereby changing the load consumption and ensuring that the load consumption is always lower than the engine output, thus improving the engine's working efficiency and service life.

[0004] The present invention achieves the above objectives through the following technical solutions:

[0005] A method for power matching control of a monorail crane locomotive includes the following steps:

[0006] Obtain engine speed, engine output torque, main pump output pressure, and output flow rate;

[0007] The load torque is calculated based on the engine speed, the main pump output pressure and output flow, and the ratio of the load torque to the engine output torque is obtained.

[0008] When the ratio of load torque to engine output torque is less than the set value, the operating handle amplitude is increased, the input current of the proportional pressure reducing valve is increased, and the main pump displacement is increased; when the ratio of load torque to engine output torque is greater than the set value, the operating handle amplitude is increased, the execution module oversteps its authority to control the input current of the proportional pressure reducing valve to decrease, and the main pump displacement is decreased.

[0009] Furthermore, as the input current of the proportional pressure reducing valve increases, the engine speed increases, the output control pressure of the proportional pressure reducing valve increases, and the main pump displacement increases; as the input current of the proportional pressure reducing valve decreases, the engine speed decreases, the output control pressure of the proportional pressure reducing valve decreases, and the main pump displacement decreases.

[0010] Furthermore, when the ratio of load torque to engine output torque is less than the set value, the slope of the engine speed control curve is greater than the slope of the proportional pressure reducing valve control curve; when the ratio of load torque to engine output torque is greater than the set value, the slope of the proportional pressure reducing valve control curve is negative.

[0011] Furthermore, the load torque is calculated based on the main pump output torque, the auxiliary system consumed torque, and the engine accessory consumed torque.

[0012] Furthermore, the formula for calculating the load torque is as follows:

[0013] T L =T1+T2+T3

[0014] Wherein: T L T1 is the load torque, T2 is the main pump output torque, T3 is the auxiliary system consumed torque, and T4 is the engine accessory consumed torque.

[0015] Furthermore, the formula for calculating the output torque of the main pump is as follows:

[0016]

[0017] Where: Q is the main pump output flow rate, ΔP is the main pump output pressure difference, n is the engine speed, and η is the main pump total efficiency.

[0018] The present invention also provides a power matching control device for a monorail crane locomotive, the control device comprising:

[0019] The acquisition module is used to acquire engine speed, engine output torque, main pump output pressure, and output flow rate.

[0020] The comparison module is used to calculate the load torque based on the engine speed, the main pump's output pressure and output flow, and obtain the ratio of the load torque to the engine output torque;

[0021] The execution module controls the input current of the proportional pressure reducing valve. When the ratio of the load torque to the engine output torque is less than the set value, it executes general logic to control the input current of the proportional pressure reducing valve to change positively with the handle amplitude. When the ratio of the load torque to the engine output torque is greater than the set value, it increases the operating handle amplitude and oversteps its authority to reduce the input current of the proportional pressure reducing valve.

[0022] The present invention also provides a monorail crane, including the above-mentioned monorail crane power matching control device.

[0023] The present invention also provides a storage medium storing a monorail locomotive power matching control program, wherein the monorail locomotive power matching control program controls the device where the storage medium is located to execute the above-described monorail locomotive power matching control method when it is running.

[0024] Beneficial effects of this invention:

[0025] This invention studies a control technology for automatically adjusting load consumption of a monorail crane during operation based on actual transportation conditions. By changing the main pump displacement, the load torque is kept lower than the engine output torque while maintaining a certain ratio. This allows the monorail crane to adjust the closed-loop piston pump displacement according to the load size during operation, thereby changing the load consumption and avoiding phenomena such as engine speed reduction and black smoke caused by excessive load torque. Ultimately, this achieves optimal matching of the monorail crane's power system, ensuring that the load consumption is always lower than the engine output, thus improving engine efficiency and service life. Attached Figure Description

[0026] Figure 1 This is a simplified logic diagram of the power matching control technology in this invention;

[0027] Figure 2 This is a diagram showing the relationship between the handle amplitude and the controller output in this invention.

[0028] Figure 3 This is a diagram showing the relationship between the handle amplitude and the controller output when the engine speed decreases in this invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] like Figure 1 As shown, a power matching control system for a monorail crane includes an operating handle 1, a controller 2, a pressure sensor 3, a flow sensor 4, a proportional pressure reducing valve 5, a closed-loop piston pump 6, an engine 7, and an engine control unit 8. The operating handle 1 can simultaneously control the engine speed and the hydraulic pump displacement. The engine control unit 8 is used to detect parameters such as the engine speed and output torque of the engine 7. The pressure sensor 3 and the flow sensor 4 are used to detect the output pressure and flow rate of the main pump. The controller 2 controls the engine speed of the engine 7 and the output of the proportional pressure reducing valve 5. The proportional pressure reducing valve 5 outputs a pressure signal to control the swashplate angle of the closed-loop piston pump 6, thereby adjusting the main pump displacement.

[0031] The operating handle 1 can simultaneously control the engine speed and hydraulic pump displacement via electrical signals. The engine control unit 8 is used to detect parameters such as the engine speed and torque of the engine 7. The pressure sensor 3 and flow sensor 4 are used to detect the output pressure and flow of the main pump. The controller 2 controls the engine speed and the output of the proportional pressure reducing valve 5 via electrical signals. The proportional pressure reducing valve 5 outputs a hydraulic pressure signal through the hydraulic pipeline to control the swashplate angle of the closed piston pump 6, thereby adjusting the displacement of the main pump through a mechanical structure.

[0032] like Figure 2 As shown, the amplitude of the operating handle 1 determines the magnitude of the output control signal of the controller 2, and the slope determines the rate of change of the control signal; the controller 2 will operate according to formula T L =Calculate the current load torque T using data from T1+T2+T3, pressure sensor 3, flow sensor 4, and engine control unit 8. L T L This includes the main pump output torque T1, the auxiliary system consumed torque T2, and the engine accessory consumed torque T3, among which... T2 = f1(n), T3 = f2(n); where Q is the main pump output flow rate, ΔP is the main pump output pressure difference, n is the engine speed, and η is the main pump total efficiency; simultaneously, the controller 2 reads the output torque T0 of the engine 7 at the current engine speed through the engine control unit 8; finally, it judges... To achieve different variable control of the closed-loop piston pump 6; when At this time, the operating handle 1 controls the engine speed and the output of the proportional pressure reducing valve simultaneously through the controller 2. In this situation, the slope K1 of the engine speed control curve is greater than the slope K2 of the proportional pressure reducing valve control curve, resulting in slower load torque build-up and faster engine output performance improvement. When the locomotive starts on a slope or under other operating conditions... At this time, the slope of the proportional pressure reducing valve control curve changes to K3, and K3 is a negative value. At this point, the control signal of the proportional pressure reducing valve 5 weakens, the output decreases, the displacement of the closed-loop piston pump 6 decreases, and the load torque consumption decreases; (The sentence is incomplete and ends abruptly.) Afterwards, the slope of the proportional pressure reducing valve control curve becomes K4. At this time, the output performance of engine 7 has been improved, the control signal of proportional pressure reducing valve 5 is enhanced, the output increases, the displacement of closed plunger pump 6 increases, and the locomotive power is matched efficiently.

[0033] like Figure 3 As shown, when the operating handle 1 becomes smaller and the engine speed decreases, the slope K1 of the engine speed control curve of the controller 2 is less than the slope K2 of the proportional pressure reducing valve control curve. The control signal of the proportional pressure reducing valve 5 precedes the control signal of the engine speed, which causes the load torque to decrease rapidly and avoids excessive load dragging the engine when going downhill.

[0034] In summary, the power matching technology for monorail locomotives researched in this invention can adjust the load size according to different transportation conditions, so as to match the locomotive load consumption with the engine output and reduce the failure rate of the power system.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any modifications or alterations made by those skilled in the art without departing from the scope of the present invention using the above-described technical content are equivalent embodiments and still fall within the scope of the present invention.

Claims

1. A power matching control method for a monorail crane locomotive, characterized in that, Includes the following steps: Obtain engine speed, engine output torque, main pump output pressure, and output flow rate; The load torque is calculated based on the engine speed, the output pressure and flow of the main pump, as well as the torque consumed by the auxiliary system and the torque consumed by the engine accessories, to obtain the ratio of the load torque to the engine output torque. When the ratio of load torque to engine output torque is less than the set value, the operating handle amplitude is increased, the input current of the proportional pressure reducing valve is increased, and the main pump displacement is increased; when the ratio of load torque to engine output torque is greater than the set value, the operating handle amplitude is increased, the execution module oversteps its authority to control the input current of the proportional pressure reducing valve to decrease, and the main pump displacement is decreased.

2. The power matching control method for rail-mounted cranes according to claim 1, characterized in that, When the input current of the proportional pressure reducing valve increases, the output control pressure of the proportional pressure reducing valve increases, and the displacement of the main pump increases; when the input current of the proportional pressure reducing valve decreases, the output control pressure of the proportional pressure reducing valve decreases, and the displacement of the main pump decreases.

3. The power matching control method for rail-mounted cranes according to claim 1, characterized in that, When the ratio of load torque to engine output torque is less than the set value, the slope of the engine speed control curve is greater than the slope of the proportional pressure reducing valve control curve; when the ratio of load torque to engine output torque is greater than the set value, the slope of the proportional pressure reducing valve control curve is negative.

4. The power matching control method for rail-mounted cranes according to claim 1, characterized in that, The load torque is calculated based on the main pump output torque, the torque consumed by the auxiliary system, and the torque consumed by the engine accessories.

5. The power matching control method for rail-mounted cranes according to claim 1, characterized in that, The formula for calculating the load torque is as follows: T L T1+T2+T3 Wherein: T L T1 is the load torque, T2 is the main pump output torque, T3 is the auxiliary system consumed torque, and T4 is the engine accessory consumed torque.

6. The power matching control method for rail-mounted cranes according to claim 5, characterized in that, The formula for calculating the output torque of the main pump is as follows: Where: Q is the main pump output flow rate, ΔP is the main pump output pressure difference, n is the engine speed, and η is the main pump total efficiency.

7. A power matching control device for a monorail crane locomotive, characterized in that, The control device includes: The acquisition module is used to acquire engine speed, engine output torque, main pump output pressure, and output flow rate. The comparison module is used to calculate the load torque based on the engine speed, the output pressure and flow of the main pump, as well as the torque consumed by the auxiliary system and the torque consumed by the engine accessories, and obtain the ratio of the load torque to the engine output torque. The execution module controls the input current of the proportional pressure reducing valve. When the ratio of the load torque to the engine output torque is less than the set value, it executes general logic to control the input current of the proportional pressure reducing valve to change positively with the handle amplitude. When the ratio of the load torque to the engine output torque is greater than the set value, it increases the operating handle amplitude and oversteps its authority to reduce the input current of the proportional pressure reducing valve.

8. A monorail crane, characterized in that, Includes the monorail locomotive power matching control device as described in claim 7.

9. A storage medium, characterized in that, The storage medium stores a monorail locomotive power matching control program. When the monorail locomotive power matching control program is run, it controls the device where the storage medium is located to execute the monorail locomotive power matching control method as described in any one of claims 1-6.

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