Adjustable electric damping lifting system for dumper and control method

Abstract

The invention discloses an adjustable electric damping lifting system for a dumper and a control method. The adjustable electric damping lifting system comprises a connecting gear pump of a hydraulic oil tank, the gear pump is connected with a lifting oil cylinder through a lifting valve and a motor, the control end of the lifting valve is connected with a potentiometer lifting handle, the control end for controlling lifting is connected with a limiting valve, and the limiting valve is arranged beside the lifting oil cylinder; the motor is connected with a generator through an overrun clutch. The generator is connected with a battery pack. The input end of the controller is connected with a potentiometer lifting handle and a sensor, and the output end of the controller is connected with a motor driving module and an engine control unit. Falling potential energy is converted into electric energy to be stored through the motor on the oil return way of the single-action lifting oil cylinder, and resources are saved; through the cooperation of the single-action lifting handle and the controller, the load of the generator is dynamically adjusted, and the intelligent control of the vehicle is improved; parameters are detected in real time through the controller, it is guaranteed that the torque of the generator reaches the target value, and precise control over the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and specifically to an adjustable resistive lifting system and control method for dump trucks. Background Art

[0002] Currently, the wide-body dump trucks with the largest market share in the Chinese market have an annual sales volume of about 20,000 units. The lifting system generally uses a plunger lifting cylinder, pneumatic proportional lifting, throttle control for the lifting speed, and proportional valve control for the falling speed. During the falling process, especially in the case of heavy-load falling, the gravitational potential energy of hundreds of tons is converted into heat energy in large quantities through the proportional valve to achieve slow falling. The generation of excess heat energy not only causes waste of energy but also overheats the valve group and damages the seals. If this part of the energy can be collected and stored for utilization, calculated based on the current market inventory and demand, a large amount of energy will be saved, making a great contribution to reducing carbon emissions. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide an adjustable resistive lifting system and control method for dump trucks with a simple structure and good effects.

[0004] The present invention is implemented as follows: An adjustable resistive lifting system for a dump truck includes a connecting gear pump of a hydraulic oil tank. The gear pump is connected to a lifting cylinder through a lifting valve and a motor. The control end of the lifting valve is connected to a potentiometer lifting handle. The control end of the lifting valve for controlling lifting is connected to the potentiometer lifting handle through a limit valve. The limit valve is arranged beside the lifting cylinder. The motor is connected to a generator through an overrunning clutch, and the generator is connected to a battery pack. It further includes a controller. The input end of the controller is connected to a potentiometer lifting handle and a sensor. The output end of the controller is connected to a motor drive module and an engine control unit. The sensor is used to detect the parameters of the generator.

[0005] Further, the gear pump is connected to an engine.

[0006] The lifting valve is a three-position five-way pneumatic directional control valve.

[0007] The potentiometer lifting handle is provided with a three-position five-way manual directional control valve.

[0008] The potentiometer lifting handle is connected to the controller through a signal amplifier.

[0009] The controller controls the operation of the generator through the motor drive module.

[0010] The overrunning clutch is a wedge-type overrunning clutch, and the transmission shaft of the motor is connected to the driving shaft of the overrunning clutch.

[0011] A control method for an adjustable resistive damping lifting system for a dump truck, including two working conditions: vehicle lifting and vehicle lowering, is as follows: During the vehicle lifting process, operating the potentiometer lifting handle drives the lifting valve to the lifting position, and pressure oil enters the lifting cylinder. At this time, the overrunning clutch is in the overrunning and disengaged state, and the lifting speed of the lifting cylinder is controlled by controlling the engine speed; During the vehicle lowering process, operating the potentiometer lifting handle drives the lifting valve to the lowering position, and the hydraulic oil flows out of the lifting cylinder. The hydraulic oil drives the motor to rotate in the reverse direction. At this time, the overrunning clutch is in the locked state, and the generator starts to work, converting the redundant potential energy of the falling load into electrical energy and storing it in the battery pack; During the vehicle lowering process, after the controller receives the signal from the potentiometer lifting handle, it calculates the corresponding torque control value according to the preset control algorithm and transmits the control signal to the motor drive module to adjust the torque of the generator through the motor drive module.

[0012] During the vehicle lowering process, the angle of the potentiometer lifting handle is inversely proportional to the torque output by the motor.

[0013] During the vehicle lowering process, the sensor feeds back the actual torque and speed of the generator to the controller. The controller compares the actual value with the target value according to the feedback. In the case of a large numerical deviation, the control signal is adjusted according to the control algorithm of the engine control unit to adjust the torque of the generator to reach the target value.

[0014] The present invention has the following advantages: An adjustable resistive damping lifting system and control method for a dump truck according to the present invention convert the falling potential energy into electrical energy and store it through the motor on the oil return path of the single-acting lifting cylinder, saving resources; through the cooperation of the single-acting lifting handle and the controller, the generator load is dynamically adjusted, improving the intelligent control of the vehicle; through the controller's real-time detection of parameters, it is ensured that the generator torque reaches the target value, improving the precise control of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] In the drawings: Figure 1 is the hydraulic schematic diagram of the present invention; Figure 2 is the electrical control schematic diagram of the present invention; Figure 3 is the control logic flow chart of the present invention; Figure 4 is the adjustment curve of the handle angle and the motor torque of the present invention; Figure 5 is the adjustment curve of the handle angle and the falling speed of the present invention.

[0017] In the figure: 1. hydraulic oil tank, 2. gear pump, 3. lifting valve, 4. battery pack, 5. generator, 6. overrunning clutch, 7. motor, 8. lifting cylinder, 9. limit valve, 10. potentiometer lifting handle, 11. return oil filter, 12. controller, 13. motor drive module, 14. engine control unit, 15. sensor.

[0018] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Such as Figures 1 to 5An adjustable damping lifting system for a dump truck is shown, which includes a connecting gear pump 2 of a hydraulic oil tank 1. The gear pump 2 is connected to a lifting cylinder 8 through a lifting valve 3 and a motor 7. The control end of the lifting valve 3 is connected to a potentiometer lifting handle 10. The control end of the lifting valve 3 for controlling the lift is connected to the potentiometer lifting handle 10 through a limit valve 9. The limit valve 9 is arranged beside the lifting cylinder 8. The motor 7 is connected to a generator 5 through an overrunning clutch 6, and the generator 5 is connected to a battery pack 4. It also includes a controller 12. The input end of the controller 12 is connected to the potentiometer lifting handle 10 and a sensor 15. The output end of the controller 12 is connected to a motor drive module 13 and an engine control unit 14. The sensor 15 is used to detect the parameters of the generator 5. In the adjustable damping lifting system for a dump truck of the present invention, the gear pump transports the hydraulic oil in the hydraulic oil tank to the lifting cylinder through the lifting valve and the motor. The lifting cylinder is a single-acting lifting cylinder. Therefore, the return oil of the lifting cylinder returns to the hydraulic oil tank through the motor, the lifting valve, and the return oil filter 11. Among them, the lifting valve is controlled by the potentiometer lifting handle. The lifting valve is provided with a limit valve on the control pipeline for lifting. When the lifting cylinder reaches the lifting position, the limit valve is triggered, and the lifting control pipeline of the lifting valve is cut off, and the lifting cylinder stops lifting. The motor is connected to the battery pack through the overrunning clutch and the generator. When the vehicle is lifted, the overrunning clutch is in a disengaged state to prevent the motor from driving mechanical components in the reverse direction. When the vehicle descends, the overrunning clutch locks to transmit torque, driving the generator to generate electricity for charging the battery pack, realizing the recycling of resources. The present invention is also provided with a controller. When descending, the controller collects the signal of the potentiometer lifting handle, controls the torque of the generator, and realizes the regulation of the vehicle descending speed. At the same time, the controller collects the parameters of the generator through the sensor, compares the actual data with the target data, and corrects the operating state of the generator in real time, realizing the feedback regulation of the engine, forming a closed-loop control, and improving the precise control of the engine.

[0023] As Figure 1 shown, an adjustable damping lifting system for a dump truck, the gear pump 2 is connected to an electric motor. When the lifting cylinder of the present invention performs a lifting action, the overrunning clutch is in a disengaged state. Therefore, by controlling the engine speed through the throttle force, the output of the gear pump is affected, and further the lifting speed of the single-acting lifting cylinder is controlled.

[0024] As Figure 1 shown, an adjustable damping lifting system for a dump truck, the lifting valve 3 is a three-position three-way pneumatic directional control valve. The lifting valve of the present invention is a pneumatic control valve, with a fast response speed and stable system operation.

[0025] As Figure 1An adjustable damping lifting system for a dump truck is shown. A three-position five-way manual reversing valve is provided inside the potentiometer lifting handle 10. In the potentiometer lifting handle of the present invention, a potentiometer and a manual reversing valve are integrated. The potentiometer outputs a voltage signal proportional to the handle operation amount according to the rotation angle of the handle to the controller, facilitating the controller to read the handle information. The manual reversing valve can be connected to various forms such as a handle, a knob, and a pedal to achieve control.

[0026] As Figures 1 to 3 An adjustable damping lifting system for a dump truck is shown. The potentiometer lifting handle 10 is connected to the controller 12 through a signal amplifier. The voltage signal output by the potentiometer lifting handle of the present invention is amplified and filtered through a signal preprocessing link and then converted into a digital signal and transmitted to the controller, facilitating the controller to read the information.

[0027] As Figures 1 to 3 An adjustable damping lifting system for a dump truck is shown. The controller 12 controls the generator 5 to operate through the motor drive module 13. The signal transmission between the controller and the generator of the present invention is realized through the motor drive module. Since the power of the control signal is usually small and cannot directly drive the torque adjustment device of the generator, the control signal needs to be transmitted to the motor drive module, and the power is amplified to realize the adjustment of the generator torque.

[0028] As Figures 1 to 3 An adjustable damping lifting system for a dump truck is shown. The overrunning clutch 6 is a wedge-type overrunning clutch, and the transmission shaft of the motor 7 is connected to the driving shaft of the overrunning clutch 6. The overrunning clutch of the present invention adopts a wedge-type overrunning clutch. When the vehicle is lifted, the driving shaft of the overrunning clutch rotates reversely, the wedge blocks disengage, and the driven shaft idles. The overrunning clutch is in a disengaged state. Therefore, the motor idles, which can prevent the motor from driving mechanical components in the reverse direction. When the vehicle descends, the driving shaft of the overrunning clutch rotates forward, the wedge blocks are locked synchronously with the outer ring, driving the driven shaft to rotate. The overrunning clutch is locked to transmit torque, and the motor can transmit torque to the generator to drive the generator to operate and charge the battery pack, realizing the recycling of resources.

[0029] A control method for an adjustable damping lifting system for a dump truck includes two working conditions: vehicle lifting and vehicle lowering, as follows: During the vehicle lifting process, the driver moves the potentiometer lifting handle 8 to the lifting position. The handle spool moves, and the air path connected to the air source reaches the lifting air port of the lifting valve 3 through the limit valve 9. The air pressure pushes the spool of the lifting valve 3 to move leftward. The pressure oil enters the single-acting lifting cylinder 8 after passing through the hydraulic oil tank 1, the gear pump 2, the lifting valve 3, and the motor 7. At this time, the overrunning clutch 6 is in the overrunning (i.e., separated) state to prevent the motor 7 from driving the mechanical components in the reverse direction. The driver can only control the engine speed by adjusting the throttle force, thereby affecting the output of the gear pump 2 and further controlling the lifting speed of the single-acting lifting cylinder 8.

[0030] During the vehicle lowering process, the driver moves the potentiometer lifting handle 10 to the lowering position. The air path enters the lowering air port of the lifting valve 3. The air pressure pushes the spool of the lifting valve 3 to move rightward. After the spool of the lifting valve 3 moves rightward, the oil in the single-acting lifting cylinder 8 flows out, driving the motor 7 to rotate in the reverse direction. At this time, the overrunning clutch 6 is in the locked state, and the generator 5 starts to work, converting the redundant potential energy of the falling load into electrical energy and storing it in the battery pack.

[0031] Meanwhile, the potentiometer in the potentiometer lifting handle 10 outputs a voltage signal proportional to the handle operation amount according to the rotation angle of the handle. The voltage signal is amplified and filtered through the signal preprocessing link and then converted into a digital signal for transmission to the controller 12. After receiving the digital signal, the controller 12 calculates the corresponding torque control value according to the preset control algorithm, and then converts the torque control value into a specific control signal. Since the power of the control signal is usually small and cannot directly drive the torque adjustment device of the generator, the control signal needs to be transmitted to the motor drive module 13 to amplify the power and achieve the adjustment of the torque of the generator 5. Among them, since the angle of the potentiometer lifting handle 10 is inversely proportional to the torque output by the motor 7, the larger the angle of the potentiometer lifting handle 10, the smaller the torque generated by the generator 5, and the faster the falling speed of the lifting cylinder 8. Conversely, the smaller the angle of the potentiometer lifting handle 10, the larger the torque value of the generator 5, and the slower the falling speed of the lifting cylinder 8.

[0032] To achieve precise control of the electrical signal, it is necessary to detect the actual torque, speed and other parameters of the generator 5 in real time, and feedback the detection results to the controller 12 through the sensor 15. The controller 12 compares the actual value and the target value according to the feedback. In the case of a large numerical deviation, the control signal can be adjusted according to the control algorithm of the ECU - engine control unit 14 to make the torque of the generator 5 reach the target value.

[0033] The adjustable resistive lifting system and control method for dump trucks according to the present invention convert the falling potential energy into electrical energy for storage through a motor on the oil return path of a single-acting lifting cylinder, avoiding waste of energy and protecting hydraulic components from damage due to overheating, thus achieving resource conservation; through the cooperation of a single-acting lifting handle and a controller, the load of the generator is dynamically adjusted to form a closed-loop control, improving the intelligent control of the vehicle. Among them, the potentiometer lifting handle integrates a high-precision rotary potentiometer inside the handle, with high integration. At the same time, the lifting handle can be in various forms such as a knob or a pedal, and the handle control signal is not limited to pneumatic control, but can also be hydraulic control and electric control; by the controller's real-time detection of parameters, the generator torque is ensured to reach the target value, improving the precise control of the vehicle; by dynamically adjusting the electrical load of the generator instead of traditional oil throttling, the influence of oil temperature and viscosity is eliminated, and the response speed is improved.

[0034] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0035] In addition, those skilled in the art can understand that although some of the embodiments described herein include certain features contained in other embodiments rather than other features, the combination of the features of different embodiments also means that it is within the protection scope of the present invention and forms different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0036] The above are only the preferred embodiments of the present invention, and there is no any form of limitation to the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications using the technical content prompted above as equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An adjustable resistive lifting system for a dump truck, characterized in that: A connecting gear pump (2) including a hydraulic oil tank (1), the gear pump (2) is connected to a lifting cylinder (8) through a lifting valve (3) and a motor (7), a potentiometer lifting handle (10) is connected to the control end of the lifting valve (3), the control end of the lifting valve (3) for controlling lifting is connected to the potentiometer lifting handle (10) through a limit valve (9), and the limit valve (9) is arranged beside the lifting cylinder (8); the motor (7) is connected to a generator (5) through an overrunning clutch (6), and the generator (5) is connected to a battery pack (4); It further includes a controller (12), the input end of the controller (12) is connected to a potentiometer lifting handle (10) and a sensor (15), the output end of the controller (12) is connected to a motor drive module (13) and an engine control unit (14), and the sensor (15) is used to detect the parameters of the generator (5).

2. The adjustable resistive lifting system for a dump truck according to claim 1, wherein: The gear pump (2) is connected to an engine.

3. The adjustable resistive lifting system for a dump truck according to claim 1, wherein: The lifting valve (3) is a three-position five-way pneumatic reversing valve.

4. The adjustable damping lifting system for a dump truck according to claim 1, wherein: A three-position five-way manual reversing valve is arranged in the potentiometer lifting handle (10).

5. The adjustable resistance damping lifting system for a dump truck according to claim 1, characterized in that: The potentiometer lifting handle (10) is connected to the controller (12) through a signal amplifier.

6. The adjustable resistive lifting system for a dump truck according to claim 1, wherein: The overrunning clutch (6) is a wedge overrunning clutch, and the transmission shaft of the motor (7) is connected to the driving shaft of the overrunning clutch (6).

7. The adjustable damping lifting system for a dump truck according to claim 1, characterized in that: The controller (12) controls the operation of the generator (5) through the motor drive module (13).

8. A control method for an adjustable damping lifting system for a dump truck according to claim 1, characterized in that: It includes two working conditions: vehicle lifting and vehicle lowering, specifically as follows: During the vehicle lifting process, operating the potentiometer lifting handle (10) drives the lifting valve (3) to be in the lifting position, and pressure oil enters the lifting cylinder (8). At this time, the overrunning clutch (6) is in the overrunning or separated state, and the lifting speed of the lifting cylinder (8) is controlled by controlling the engine speed; During the vehicle lowering process, operating the potentiometer lifting handle (10) drives the lifting valve (3) to be in the lowering position, hydraulic oil flows out of the lifting cylinder (8), and the hydraulic oil drives the motor (7) to rotate in the reverse direction. At this time, the overrunning clutch (6) is in the locked state, and the generator (5) starts to work, converting the redundant potential energy of the falling load into electrical energy and storing it in the battery pack (4); During the vehicle lowering process, after the controller (12) receives the signal of the potentiometer lifting handle (10), it calculates the corresponding torque control value according to the preset control algorithm, and transmits the control signal to the motor drive module (13) to adjust the torque of the generator (5) through the motor drive module (13).

9. The control method of an adjustable damping lifting system for a dump truck as described in claim 8, characterized in that: During the vehicle lowering process, the angle of the potentiometer lifting handle (10) is inversely proportional to the torque output by the motor (7).

10. The control method of an adjustable resistive lifting system for a dump truck according to claim 8, characterized in that: During the vehicle lowering process, the sensor (15) feeds back the actual torque and speed of the generator (5) to the controller (12). The controller (12) compares the actual value and the target value of the feedback. In the case of a large numerical deviation, the control signal is adjusted according to the control algorithm of the engine control unit (14) to adjust the torque of the generator (5) to reach the target value.

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