Hybrid operating system for mobile crane and crane

Abstract

The invention relates to a hybrid operating system for a mobile crane and a crane, which belong to the technical field of mechanical engineering. The hybrid operating system for the mobile crane comprises: an internal combustion engine 1, an all-in-one controller (2), a traction battery (3), a battery management system (BMS) (4), and a reach extension mechanism (5), wherein the traction battery (3) is connected to the battery management system (4), the battery management system (4) is connected to the all-in-one controller (2), the all-in-one controller (2) is connected to a central slewing high-pressure slip ring (6), the central slewing high-pressure slip ring (6) is connected to a first motor control unit (7), and the reach extension mechanism (5) comprises an integrated starter motor (501) and a second motor control unit (502). When an external power source is connected, the vehicle supplies power to the operating motor (8) of the superstructure via the external power source.When no external power source is connected, the combustion engine (1) drives the ISG motor (501) to generate electricity, thus solving the current problems of low energy efficiency of vehicle cranes and high pollutant emissions during operation.

Description

Field of the invention

[0001] The invention relates to a hybrid operating system for a mobile crane and a crane belonging to the technical field of mechanical engineering. State of the art

[0002] With the rapid development of engineering technology, the country is paying more and more attention to construction machinery. Cranes in engineering are being developed toward low energy consumption, low emissions, electrification, and intelligence, which places higher demands on the comprehensive performance of the cranes. The power of traditional mobile cranes for driving and loading work comes from the internal combustion engine. The optimal working range of the internal combustion engine during driving and loading work varies greatly. During loading work, the engine is frequently started and stopped. Therefore, the engine has difficulty balancing the two power ranges and cannot operate in the most economical range. When the vehicle is under working conditions such as uphill driving or starting, the required power is relatively large, which exceeds the most economical range of the internal combustion engine, thus increasing fuel consumption.When the vehicle is under working conditions such as downhill driving or braking, energy recovery is not possible, resulting in wasted engine power. Using pure electricity as the power source poses problems with battery life due to the indefinite nature of the crane's operating location and operating time, which affects the crane's charging efficiency and transition efficiency, making it difficult to expand its application. Object of the invention

[0003] In order to eliminate the deficiencies in the prior art, the invention provides a hybrid operating system for a mobile crane and a crane to solve the current problems of low energy utilization efficiency of mobile cranes and high pollutant emissions during operation.

[0004] To achieve the above object / solve the technical problems, the invention uses the following technical solution: a hybrid operating system for a mobile crane, comprising: an internal combustion engine, an all-in-one controller, a traction battery, a BMS battery management system that can control the charging and discharging of the traction battery and measure the power of the traction battery, and a range extension mechanism. The traction battery is connected to the BMS battery management system. The BMS battery management system is connected to the all-in-one controller. The all-in-one controller is connected to the center slewing gear high-pressure slip ring. The center slewing gear high-pressure slip ring is connected to a first motor controller for controlling the loading operation of the upper carriage. The all-in-one controller is connected to a third motor controller for controlling the outrigger leg operation of the lower carriage.wherein the reach extension mechanism comprises an ISG motor and a second motor controller for controlling the ISG motor, wherein the ISG motor is connected to the second motor controller, wherein the second motor controller is connected to the all-in-one controller, wherein the crankshaft output of the motor is connected to the ISG motor, and wherein the output of the ISG motor is connected to the coupling of the mobile crane.

[0005] Optionally, the all-in-one controller is connected to an on-board charger for charging the drive battery, whereby the on-board charger is provided with a power connection for an external power source.

[0006] Optionally, the combustion engine has operating states, which include the plug-in operating mode and the range-extended operating mode.

[0007] Optionally, when the on-board charger is connected to the external power source, the combustion engine is in plug-in operating mode, where the combustion engine stops working, and when the on-board charger is not connected to the external power source, the combustion engine is in range-extended operating mode, where the combustion engine drives the ISG motor to generate electricity.

[0008] Optionally, the combustion engine also has a start state, idle state and driving state.

[0009] Optionally, when the combustion engine is in the starting state, the drive battery supplies power to the ISG motor, with the second engine control unit controlling the ISG motor and starting the combustion engine with the clutch in the disengaged state.

[0010] Optionally, when the internal combustion engine is in idle state, the current of the traction battery is insufficient, the second motor controller controls the ISG motor to charge the traction battery, and when the traction battery is fully charged, the ISG motor stops working and the clutch is in the disengaged state.

[0011] Optionally, when the combustion engine is in the drive state, the second engine control unit controls the ISG motor to deliver positive or negative torque with the clutch in the engaged state.

[0012] Optionally, the first motor controller is connected to the operating motor of the superstructure, wherein the operating motor of the superstructure is connected to a first hydraulic pump for driving the loading operating system of the superstructure, and the third motor controller is connected to the support leg motor, wherein the support leg motor is connected to a second hydraulic pump for driving the support leg movements of the vehicle.

[0013] A crane incorporating the above-mentioned hybrid operating system for mobile cranes.

[0014] Compared with the prior art, the invention has the following advantages: 1. In the invention, when the internal combustion engine is in the upper carriage operating state and an external power source is connected, the vehicle supplies power to the upper carriage operating motor via the external power source and the onboard charger, achieving pure electric operation without fuel consumption. When no external power source is connected, the engine drives the ISG motor to generate power and achieve extended-range operation of the upper carriage. Since the engine always operates in the high-efficiency range, fuel consumption during upper carriage operation is significantly reduced. Therefore, the current problems of low energy utilization efficiency and high pollutant emissions during operation of mobile cranes are solved. 2. In the invention, when the internal combustion engine is in the starting state, idling state and driving state, the ISG motor participates in driving assistance and power generation in a timely manner, thereby increasing the working efficiency of the engine and reducing fuel consumption and exhaust emission. 3. The invention controls the first motor controller and the third motor controller via the all-in-one controller, thereby separately controlling the uppercarriage operating motor and the lowercarriage outrigger motor. This controls the first hydraulic pump of the uppercarriage and the second hydraulic pump of the lowercarriage, thus separating the hydraulic systems of the uppercarriage and the lowercarriage. There is no need to transmit hydraulic pressure via the center slewing gear, thus increasing work efficiency and reducing energy consumption. Short description of the drawings Fig. 1 is a schematic diagram of the embodiment of the hybrid operating system for mobile crane of the invention.

[0015] Reference symbols: 1 combustion engine, 2 all-in-one controller, 3 traction battery, 4 BMS battery management system, 5 range extension mechanism, 501 ISG motor, 502 second engine controller, 6 center slewing high-pressure slip ring, 7 first engine controller, 8 upperstructure operating motor, 9 first hydraulic pump, 10 third engine controller, 11 outrigger motor, 12 second hydraulic pump, 13 clutch, 14 on-board charger Description of the preferred embodiments

[0016] The invention is described in more detail below in conjunction with the accompanying drawings. The following embodiments serve merely to better illustrate the technical solutions of the present invention, but cannot be considered to limit the scope of the present invention.

[0017] In describing the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "top," "bottom," "front," "rear," "left," "right," "vertical," "horizontal," "ceiling," "floor," "inside," "outside," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings and are used for descriptive convenience only. They are not intended to indicate or imply that the devices or elements mentioned must have a particular orientation, be constructed, and function in a particular orientation, and are therefore not to be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and are not to be understood as indicating or implying a relative importance or implicitly indicating the set of technical features specified. Therefore, "first," "second," etc.defined features explicitly or implicitly comprise one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise stated.

[0018] When describing the present invention, it should be noted that the terms "assembly," "connection," and "connection" are to be understood in a broad sense unless otherwise specified and limited, e.g., a fixed connection or a detachable connection or an integral connection or a mechanical connection or an electrical connection or a direct connection or an indirect connection via a medium or a connection between two components. Those of ordinary skill in the art will understand the specific meanings of the above terms in the present invention based on specific situations. Embodiment 1

[0019] Fig.Figure 1 shows the hybrid operating system for a mobile crane, which includes the internal combustion engine 1, the all-in-one controller 2, the traction battery 3, the BMS battery management system 4, and the reach extension mechanism 5. The traction battery 3 is mounted on the undercarriage of the mobile crane. The traction battery 3 is connected to the BMS battery management system 4. The BMS battery management system 4 is connected to the all-in-one controller 2. The BMS battery management system 4 can control the charging and discharging of the traction battery 3 and measure the performance of the traction battery 3.

[0020] The all-in-one controller 2 is connected to the center slewing gear high-pressure slip ring 6. The center slewing gear high-pressure slip ring 6 is connected to a first motor controller 7 for controlling the loading operation of the uppercarriage. The first motor controller 7 is connected to the operating motor 8 of the uppercarriage. The operating motor 8 of the uppercarriage is connected to a first hydraulic pump 9 for driving the loading operation system of the uppercarriage. The all-in-one controller 2 is connected to a third motor controller 10 for controlling the outrigger leg operation of the lowercarriage. The third motor controller 10 is connected to the outrigger leg motor 11. The outrigger leg motor 11 is connected to a second hydraulic pump 12 for driving the outrigger leg movements of the lowercarriage. The all-in-one controller 2 separately controls the first motor controller 7 and the third motor controller 10 and thus the operating motor 8 of the uppercarriage and the outrigger leg motor 11 of the lowercarriage.This controls the first hydraulic pump 9 of the uppercarriage and the second hydraulic pump 12 of the lowercarriage, separating the hydraulic systems of the uppercarriage and the lowercarriage. There is no need to transmit hydraulic pressure via the center slewing gear, thus increasing work efficiency and reducing energy consumption.

[0021] The range extension mechanism 5 includes the ISG motor 501 and the second motor controller 502 for controlling the ISG motor 501. The ISG motor 501 is connected to the second motor controller 502. The second motor controller 502 is connected to the all-in-one controller 2. The crankshaft output of the internal combustion engine 1 is connected to the ISG motor 501. The output of the ISG motor 501 is connected to the coupling 13 of the mobile crane. The all-in-one controller 2 is connected to an on-board charger 14 for charging the traction battery 3. The on-board charger 14 is provided with a power connection for an external power source. The internal combustion engine 1 has operating states. The operating states include the plug-in operating mode and the range-extended operating mode. When the motor 1 is in the operating state and the on-board charger 14 is connected to the external power source, the motor 1 is in plug-in operating mode.The engine 1 stops working, and the external power source supplies power to the upperstructure operating motor 8 via the on-board charger 14, the all-in-one controller 2, the center slewing high-pressure slip ring 6, and the first motor controller 7. The upperstructure operating motor 8 drives the first hydraulic pump 9, allowing the upperstructure to perform movements such as turning and tilting. At the same time, the external power source supplies power to the outrigger motor 11 via the all-in-one controller 2 and the third motor controller 10, allowing the outriggers to perform horizontal and vertical telescopic movements. In plug-in operation mode, the on-board charger 14 also charges the traction battery 3 via the all-in-one controller 2 and the BMS battery management system 4. This means that the vehicle supplies power to the upperstructure operating motor 8 via the external power source and the on-board charger 14 to realize pure electric operation without fuel consumption.When the engine 1 is in the running state and the on-board charger 14 is not connected to the external power source, the engine 1 is in the extended-range operation mode. At this time, the clutch 13 is in the disengaged state. The internal combustion engine 1 drives the ISG motor 501 to generate power. Power is supplied to the upper structure's running motor 8 via the second motor controller 502, the all-in-one controller 2, the center slewing high-pressure slip ring 6, and the first motor controller 7. The upper structure's running motor 8 drives the first hydraulic pump 9 to perform movements such as turning and tilting. At the same time, the lower structure's outrigger motor 11 is supplied with power via the all-in-one controller 2 and the third motor controller 10, enabling the outriggers to perform horizontal and vertical telescopic movements.This means that when no external power source is available, engine 1 drives the ISG engine 501 to generate power to realize the uppercarriage's range extension operation. Since the internal combustion engine 1 always operates in the high-efficiency range, fuel consumption is significantly reduced during uppercarriage operation.

[0022] The internal combustion engine 1 also has a starting state, an idling state, and a driving state. When the internal combustion engine 1 is in the starting state, the traction battery 3 supplies power to the ISG motor 501. The second motor controller 502 controls the ISG motor 501 and starts the internal combustion engine 1. The clutch 13 is in the disengaged state. When the internal combustion engine 1 is in the idling state, the power from the traction battery 3 is insufficient. The second motor controller 502 starts the ISG motor 501 to charge the traction battery 3. When the traction battery 3 is fully charged, the ISG motor 501 stops operating, and the clutch 13 is in the disengaged state.

[0023] When the engine 1 is in the running state, the clutch 13 is engaged. The vehicle is mainly driven by the engine 1 for running. The power is transmitted to the wheels via the clutch 13, the transmission, the drive shaft, and the axle to drive the vehicle. When the vehicle is in the starting, accelerating, uphill, etc., the required power of the engine 1 is relatively large. The engine 1 often cannot operate in the high-efficiency range. At this time, the second engine controller 502 controls the ISG motor 501 to output positive torque as an auxiliary power, thereby reducing the output torque of the engine 1, so that the engine 1 can operate in the high-efficiency range as much as possible and reduce fuel consumption. When the vehicle is in the downhill, braking, coasting, etc., the second motor controller 502 controls the ISG motor 501 to output negative torque to generate power and perform energy recovery to charge the traction battery 3. This avoids energy waste and increases energy utilization. Embodiment 2

[0024] A crane that features the above-mentioned hybrid operating system for mobile cranes.

[0025] The above description illustrates only the preferred embodiment of the present invention. It should be noted that several improvements and modifications can be made by those skilled in the art without departing from the technical principles of the present invention. These improvements and modifications should also be considered within the scope of the present invention.

Claims

[1] Hybrid operating system for mobile crane, which includes: Combustion engine, all-in-one controller, traction battery, BMS battery management system that can control the charging and discharging of the traction battery and measure the performance of the traction battery, and range extension mechanism, wherein the traction battery is connected to the BMS battery management system, wherein the BMS battery management system is connected to the all-in-one controller, wherein the all-in-one controller is connected to the center slewing high-pressure slip ring, wherein the center slewing high-pressure slip ring is connected to a first motor controller for controlling the loading operation of the superstructure, wherein the all-in-one controller is connected to a third motor controller for controlling the outrigger leg operation of the substructure, wherein the reach extension mechanism has an ISG motor and a second motor controller for controlling the ISG motor, wherein the ISG motor is connected to the second motor controller, wherein the second motor controller is connected to the all-in-one controller, wherein the crankshaft output of the internal combustion engine is connected to the ISG motor, and wherein the output of the ISG motor is connected to the coupling of the mobile crane. [2] Hybrid operating system for mobile crane according to claim 1, characterized bythat the all-in-one controller is connected to an on-board charger for charging the drive battery, wherein the on-board charger is provided with a power connection for an external power source. [3] Hybrid operating system for mobile crane according to claim 2, characterized by that the combustion engine has operating states, the operating states including the plug-in operating mode and the range-extended operating mode. [4] Hybrid operating system for mobile crane according to claim 3, characterized by that when the on-board charger is connected to the external power source, the internal combustion engine is in plug-in operating mode, where the internal combustion engine stops operating, and when the on-board charger is not connected to the external power source, the internal combustion engine is in range-extended operating mode, where the internal combustion engine drives the ISG motor to generate power. [5] Hybrid operating system for mobile crane according to claim 1, characterized by that the combustion engine also has a starting state, an idling state and a driving state. [6] Hybrid operating system for mobile crane according to claim 5, characterized by that when the internal combustion engine is in the starting state, the drive battery supplies power to the ISG motor, the second engine control unit controls the ISG motor and starts the internal combustion engine, and the clutch is in the disengaged state. [7] Hybrid operating system for mobile crane according to claim 5, characterized by that when the internal combustion engine is in the idle state, the current of the drive battery is insufficient, the second motor controller controls the ISG motor to charge the drive battery, and when the drive battery is fully charged, the ISG motor stops working and the clutch is in the disengaged state. [8] Hybrid operating system for mobile crane according to claim 5, characterized by that when the internal combustion engine is in the driving state, the second engine controller controls the ISG motor 501 to output a positive or negative torque with the clutch in the engaged state. [9] Hybrid operating system for mobile crane according to claim 1, characterized by that the first motor control is connected to the operating motor of the superstructure, wherein the operating motor of the superstructure is connected to a first hydraulic pump for driving the loading operating system of the superstructure, and the third motor control is connected to the support leg motor, wherein the support leg motor is connected to a second hydraulic pump for driving the support leg movements of the lower vehicle. [10] A crane comprising the hybrid operating system for mobile crane according to any one of claims 1 to 9.

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