Hybrid power system for working machine and working machine

Abstract

The present invention provides a hybrid power system of a working machine and a working machine, the hybrid power system comprising: a power switching device, the power switching device comprising an input end, a first output end and a second output end, the first output end and the second output end are both selectively engageable with the input end of the power switching device; a power source, the power source comprising an engine and a motor connected to the engine, the output end of the power source is power-coupled with the input end of the power switching device; a drive shaft, the drive shaft is power-coupled with the first output end, the drive shaft is used to drive the chassis to travel; a hydraulic pump, the hydraulic pump is power-coupled with the second output end. The hybrid power system of the present invention can conveniently realize hybrid power output by connecting the motor to the engine, and can conveniently realize switching of multiple power modes by switching the power switching device, so that the working machine can operate in multiple modes according to demand, and the energy efficiency in each mode is high.

Description

Technical Field

[0001] The present invention relates to the technical field of working machines, and in particular to a hybrid power system of a working machine and the working machine. Background Art

[0002] Traditional working machinery mostly uses diesel engines to output traction power and working driving force. In order to achieve energy conservation and emission reduction, electrification of working has become an important development trend. In the existing technology, for electrified working machinery, on the one hand, it is necessary to use the engine to generate electricity for the motor, which has low energy efficiency; on the other hand, for traction power or working driving force, in a certain working process, only one power can be selected, which will limit the maximum load of the whole vehicle. Summary of the invention

[0003] The present invention provides a hybrid power system of a working machine and a working machine, so as to solve the defects of low energy efficiency or weak power of the electrified working machine in the prior art, realize the switching of multiple power modes, and the energy efficiency is high in each mode.

[0004] The present invention provides a hybrid power system for a working machine, comprising:

[0005] A power switching device, the power switching device comprising an input end, a first output end and a second output end, the first output end and the second output end both being selectively engageable with the input end of the power switching device;

[0006] A power source, the power source comprising an engine and a motor connected to the engine, the output end of the power source being power-coupledly connected to the input end of the power switching device;

[0007] A driving shaft, the driving shaft is connected to the first output end by power coupling, and the driving shaft is used to drive the chassis to travel;

[0008] A hydraulic pump is connected to the second output end by power coupling.

[0009] A hybrid power system of a working machine provided by the present invention further includes:

[0010] Energy storage devices;

[0011] A controller, wherein the controller comprises a control circuit and a DC / AC converter, wherein the control circuit is electrically connected to the engine and the energy storage device, and two ends of the DC / AC converter are electrically connected to the energy storage device and the motor respectively.

[0012] According to a hybrid power system of a working machine provided by the present invention, the hybrid power system has a hybrid mode;

[0013] In the hybrid mode, the controller is configured to control the engine to operate, while the energy storage device supplies power to the motor and the motor operates in electric mode, and the input end of the power switching device is power-coupled with the first output end or the second output end.

[0014] According to a hybrid power system of a working machine provided by the present invention, the motor has a power generation mode, and the hybrid power system has a recovery mode;

[0015] In the recovery mode, the motor operates in the power generation mode, and the input end of the power switching device is power-coupled to the first output end or the second output end.

[0016] A hybrid power system of a working machine provided by the present invention further includes:

[0017] A plug connector for electrical connection to an external power source;

[0018] The controller further includes an AC / DC converter and an AC / AC converter. Two ends of the AC / DC converter are electrically connected to the plug connector and the energy storage device respectively. Two ends of the AC / AC converter are electrically connected to the plug connector and the motor respectively.

[0019] According to a hybrid power system of a working machine provided by the present invention, the hybrid power system has a second hybrid working mode;

[0020] In the second hybrid operation mode, the controller is configured to control the engine to operate, the plug connector supplies power to the motor and the motor operates in electric mode, and the input end of the power switching device is power-coupled to the second output end.

[0021] According to a hybrid power system of a working machine provided by the present invention, the control circuit is electrically connected to the hydraulic pump, and the controller is configured to operate the motor and stop the engine. When the control circuit determines that the power of the hydraulic pump is greater than the rated power of the motor, the engine is controlled to operate.

[0022] According to a hybrid power system for a working machine provided by the present invention, the power source further includes a transmission, the output end of the engine is power-coupled with the input end of the transmission, and the output end of the transmission is coaxially connected with the motor.

[0023] According to a hybrid power system of a working machine provided by the present invention, the motor has a power generation mode, and the hybrid power system has a charging mode; in the charging mode, the controller is configured to control the engine and the motor to work simultaneously and the motor works in the power generation mode, and the transmission is switched to neutral.

[0024] According to a hybrid power system of a working machine provided by the present invention, the power source also includes a transmission, the output end of the engine is coaxially arranged with the motor, the output end of the motor is dynamically coupled to the input end of the transmission, and the output end of the transmission is dynamically coupled to the input end of the power switching device.

[0025] According to a hybrid power system of a working machine provided by the present invention, the power source further includes a transmission, and the motor is mounted on the transmission.

[0026] According to a hybrid power system of a working machine provided by the present invention, the hydraulic pump includes at least one of a main oil pump, a gear pump, and a boom pump.

[0027] According to a hybrid power system of a working machine provided by the present invention, the power switching device includes a transfer case or a power take-off.

[0028] The present invention also provides a working machine, comprising a hybrid power system of any one of the working machines described above.

[0029] The hybrid power system and the operating machine provided by the present invention can conveniently realize hybrid power output by connecting the motor to the engine, and can conveniently realize switching of various power modes by switching of the power switching device, so that the operating machine can operate in various modes according to needs, and the energy efficiency is high in each mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is one of the structural schematic diagrams of the hybrid power system of the working machine provided by the present invention;

[0032] Figure 2 This is the second structural schematic diagram of the hybrid power system of the working machine provided by the present invention;

[0033] Figure 3 This is the third structural schematic diagram of the hybrid power system of the working machine provided by the present invention;

[0034] Figure 4 It is a schematic diagram of the control flow of the hybrid power system of the working machine provided by the present invention.

[0035] Reference numerals:

[0036] A power switching device 110, an input end 111 of the power switching device, a first output end 112 of the power switching device, a second output end 113 of the power switching device, a first input gear 114a, a second input gear 114b, a first transmission gear 115, a second transmission gear 116, a first output gear 117, a second output gear 118, and a synchronizer 119;

[0037] Engine 121, transmission 122, motor 123;

[0038] Transmission shaft 131, drive shaft 132;

[0039] Boom pump 141, main oil pump 142, hydraulic pipeline 143, actuator 144;

[0040] Controller 151 , energy storage device 152 , connector 153 . DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0043] Descriptions such as "such as", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0044] Combine the following Figures 1 to 3 A hybrid power system for a work machine of the present invention is described.

[0045] The operating machine in the embodiment of the present invention may be an operating machine such as a pump truck, a truck crane, an excavator, a pile driver, a concrete machine, a road roller, a mixer truck, a tunneling machine or a fire truck.

[0046] like Figure 1-Figure 3 As shown, the hybrid power system of the working machine according to the embodiment of the present invention includes: a power switching device 110, a power source, a drive shaft 132 and a hydraulic pump.

[0047] The power switching device 110 includes an input end 111 , a first output end 112 and a second output end 113 . The first output end 112 can be selectively engaged with the input end 111 of the power switching device 110 , and the second output end 113 can be selectively engaged with the input end of the power switching device 110 .

[0048] It should be noted that the above-mentioned power coupling connection means that power can be transmitted between components.

[0049] In some embodiments, when the input end 111 of the power switching device 110 is power-coupled with the first output end 112, the input end 111 of the power switching device 110 is disconnected from the second output end 113, and power can be transmitted between the input end 111 of the power switching device 110 and the first output end 112; when the input end 111 of the power switching device 110 is power-coupled with the second output end 113, the input end 111 of the power switching device 110 is disconnected from the first output end 112, and power can be transmitted between the input end 111 of the power switching device 110 and the second output end 113.

[0050] In other embodiments, when the input end 111 of the power switching device 110 is power-coupled with the first output end 112, the input end 111 of the power switching device 110 and the second output end 113 may also be power-coupled, and the power input from the input end 111 of the power switching device 110 may be distributed to the first output end 112 and the second output end 113.

[0051] The power shifting device may include a transfer case or a power take-off.

[0052] like Figure 1-Figure 3 As shown, in some embodiments, the power switching device 110 may include: a first input gear 114 a, a second input gear 114 b, a first transmission gear 115 , a second transmission gear 116 , a first output gear 117 , a second output gear 118 and a synchronizer 119 .

[0053] Among them, the first input gear 114a and the second input gear 114b are coaxially fixedly connected and fixedly connected to the input end 111 of the power switching device 110; the first output gear 117 is fixedly connected to the first output end 112; the first transmission gear 115 and the second transmission gear 116 are coaxially fixedly connected, the second transmission gear 116 is meshed with the second output gear 118, and the second output gear 118 is fixedly connected to the second output end 113; the synchronizer 119 is used to control the first input gear 114a to mesh with the first transmission gear 115, or the synchronizer 119 is used to control the second input gear 114b to mesh with the first output gear 117 or be power-coupled.

[0054] When the synchronizer 119 synchronizes the second input gear 114b with the first output gear 117, the input end 111 is dynamically coupled to the first output end 112; when the synchronizer 119 synchronizes the first input gear 114a with the first transmission gear 115, the input end 111 is dynamically coupled to the second output end 113.

[0055] Of course, the power switching device 110 can also be other structural forms, including but not limited to planetary gear mechanisms. For example, the ring gear, sun gear and planet carrier of the planetary gear mechanism respectively form the first to third ports. In actual operation, by locking one of the ring gear, sun gear and planet carrier, the power coupling connection of the other two can be achieved; of course, two of the ring gear, sun gear and planet carrier can also be used as mixed input and the other as output.

[0056] The power source includes an engine and a motor 123, and the motor 123 is connected to the engine 121, for example, the motor 123 is coaxially connected to the engine 121. The output end of the power source is connected to the input end 111 of the power switching device 110 by power coupling.

[0057] The engine achieves power output by burning fuel, which is used to convert chemical energy into mechanical energy.

[0058] The engine 121 may be a diesel engine or a gasoline engine. For operating machinery, a diesel engine may be selected to provide stronger power.

[0059] The output shaft of the engine and the motor shaft of the motor 123 can be coaxially fixedly connected, and the connection method includes but is not limited to: connecting through a coupling, a spline or a flange or other structure.

[0060] The power source may further include: a transmission 122 .

[0061] The motor 123 and the engine 121 may be connected directly or indirectly.

[0062] There may be various connection positions between the motor 123 and the engine, including but not limited to: the output end of the engine 121 or the output end of the transmission 122, etc., which will be described in detail in the following embodiments.

[0063] The output end of the power source can output the power of the engine 121 or the power of the motor 123 to the input end 111 of the power switching device 110 , or output a mixed power of the engine 121 and the power of the motor 123 to the input end 111 of the power switching device 110 .

[0064] The drive shaft 132 is used to drive the chassis of the working machine to travel. The drive shaft 132 is used to be coupled to the driving axle of the working machine. The driving axle of the working machine may include a differential, a left half shaft and a right half shaft. The drive shaft 132 is used to be coupled to the input end of the differential.

[0065] The first output end 112 of the power switching device 110 is connected to the drive shaft 132 by power coupling, and the connection method includes but is not limited to: connecting through a coupling, a spline or a flange structure; or Figure 1-Figure 3 As shown, the first output end 112 of the power switching device 110 is connected to the drive shaft 132 through a transmission shaft 131. The connection method of the first output end 112 of the power switching device 110 through the transmission shaft 131 includes but is not limited to: connection through couplings, splines or flanges and other structures. The connection method of the transmission shaft 131 and the drive shaft 132 includes but is not limited to: connection through couplings, splines or flanges and other structures.

[0066] In this way, when the input end 111 of the power switching device 110 is power-coupled with the first output end 112, the output end of the power source can drive the working machinery to travel, and the driving force can be the power of the engine or the power of the motor 123, or the hybrid power of the engine and the motor 123.

[0067] The hydraulic pump is power-coupled to the second output terminal 113 of the power switching device 110. The hydraulic pump can be used to drive the upper operating system of the working machine. The upper operating system of the working machine is used to perform the working actions of the working machine. Different working machines have different upper operating systems, and correspondingly, the structure of the hydraulic pump is also different.

[0068] When the operating machine is a pump truck, Figure 1-Figure 3As shown, the hydraulic pump may include a boom pump 141 and a main oil pump 142, and both the boom pump 141 and the main oil pump 142 are power-coupled to the second output end 113 of the power switching device 110. The boom pump 141 is used to control the deployment or folding of the boom of the pump truck, and the main oil pump 142 is used to control the pumping of concrete. The main oil pump 142 can be connected to the actuator 144 through a hydraulic pipeline 143. The hydraulic pump can also include a gear pump, which is used to drive the swing cylinder to swing, and can also be used to drive the fan to dissipate heat. In addition, in other embodiments of the present application, the hydraulic pump can also be one of the main oil pump, the gear pump, and the boom pump, or two or all three of them.

[0069] In the case where the working machine is a truck crane, the upper loading working system may include at least one of the following: a lifting mechanism, a telescopic mechanism, a hoisting mechanism, a slewing mechanism, etc. The input end of the hydraulic pump is power-coupled with the second output end 113 of the power switching device 110, and the hydraulic pump may be a plunger pump, an internal gear pump, an external gear pump, etc. The hydraulic pump may control the lifting mechanism, the telescopic mechanism, the hoisting mechanism, the slewing mechanism, etc.

[0070] It is understandable that the hybrid power system of the working machine can provide at least multiple working modes for the driving power of the working machine and the power source of the upper working system:

[0071] First, the fuel-driven mode.

[0072] Whether in the process of driving or loading the operating system, the hybrid system of the operating machine can have a fuel drive mode.

[0073] When driving, the engine is running, the coaxially connected motor 123 is idling, the output end of the power source can input the power of the engine to the input end 111 of the power switching device 110, the input end 111 of the power switching device 110 is power-coupled with the first output end 112, and the drive shaft 132 is driven.

[0074] When the upper installation system is operating, the engine is working, the coaxially connected motor 123 is idling, the output end of the power source can input the power of the engine to the input end 111 of the power switching device 110, the input end 111 of the power switching device 110 is power-coupled with the second output end 113, and the hydraulic pump is driven.

[0075] In fuel drive mode, the engine can provide sufficient power for the driving or loading operation system to ensure that the driving or loading operation system can complete various high-power operation requirements.

[0076] Second, pure electric driving mode.

[0077] Whether in driving or operating the upper working system, the hybrid system of the working machine can have a pure electric drive mode.

[0078] When driving, the engine is stopped, the coaxially connected motor 123 is working, the output end of the power source can input the power of the motor 123 to the input end 111 of the power switching device 110, the input end 111 of the power switching device 110 is power-coupled with the first output end 112, and the drive shaft 132 is driven.

[0079] When the upper installation system is operating, the engine is stopped, the coaxially connected motor 123 is working, the output end of the power source can input the power of the motor 123 to the input end 111 of the power switching device 110, the input end 111 of the power switching device 110 is power-coupled with the second output end 113, and the hydraulic pump is driven.

[0080] In pure electric drive mode, clean operations can be achieved, exhaust emissions can be reduced, and noise is low during operation.

[0081] Third, hybrid drive mode.

[0082] Whether in the process of driving or loading operation system operation, the hybrid power system of the operation machine can have a hybrid drive mode.

[0083] When driving, the engine is working, the motor 123 is working, and the output end of the power source can input the hybrid power of the engine and the motor 123 to the input end 111 of the power switching device 110. The input end 111 of the power switching device 110 is power-coupled with the first output end 112, and the drive shaft 132 is driven.

[0084] When the upper installation system is operating, the engine is working, the motor 123 is working, the output end of the power source can input the hybrid power of the engine and the motor 123 to the input end 111 of the power switching device 110, the input end 111 of the power switching device 110 is power-coupled with the second output end 113, and the hydraulic pump is driven.

[0085] In the hybrid drive operation mode, the drive of two power sources can avoid insufficient power when driven by a single power source, and can achieve extremely high power output, effectively improving the maximum operating power of the operating machinery.

[0086] According to the hybrid power system of the working machinery of the embodiment of the present invention, hybrid power output can be easily achieved by connecting the motor 123 to the engine, and switching of various power modes can be easily achieved by switching the power switching device 110, so that the working machinery can operate in various modes according to needs, and the energy efficiency is high in each mode.

[0087] In some embodiments, Figure 1-Figure 3 As shown, the hybrid power system may include: an energy storage device 152 and a controller 151, the controller 151 includes a control circuit and a DC / AC converter, the control circuit and the DC / AC converter are electrically connected, the control circuit is electrically connected to the engine 121 and the energy storage device 152, and the two ends of the DC / AC converter are electrically connected to the energy storage device 152 and the motor 123 respectively.

[0088] The electrical connection may be a wireless connection or a wired connection via a cable.

[0089] The control circuit is used to control the DC / AC converter, the engine, the energy storage device 152 and the motor 123. The DC / AC converter is used to realize the conversion between direct current and alternating current between the energy storage device 152 and the motor 123.

[0090] In this way, the hybrid power system of the working machine can switch to pure electric drive mode or hybrid drive mode when there is no external power supply. The energy storage device 152 can be a battery, such as a lead-acid battery, a lithium iron phosphate battery, a ternary lithium battery or other forms of electric energy storage structure.

[0091] In some embodiments, Figure 1-Figure 3 As shown, the hybrid power system may include: a plug connector, which is used for electrically connecting to an external power source.

[0092] The controller 151 includes an AC / DC converter and an AC / AC converter. The two ends of the AC / DC converter are electrically connected to the plug connector and the energy storage device 152 respectively, and the two ends of the AC / AC converter are electrically connected to the plug connector and the motor 123 respectively.

[0093] The AC / DC converter is used to realize the conversion between the AC power and the DC power between the plug connector and the energy storage device 152. The AC / AC converter is used to realize the conversion between the AC power and the AC power between the plug connector and the motor 123.

[0094] The plug connector 153 may include a male plug connector or a female plug connector.

[0095] When the connector 153 is connected to an external power source, the motor 123 can directly consume the electric energy of the external power source to drive the upper loading operation system; when the external power source is AC power, the operation machine can maintain a long continuous operation time, and the operation process is clean, environmentally friendly and low in noise.

[0096] In the actual operation process, the energy storage device 152 may be charged in advance. There are multiple ways to charge the energy storage device 152. The following describes two ways of charging.

[0097] First, the energy storage device 152 is charged through an external power source.

[0098] In this embodiment, the connector 153 is connected to an external power source, and the energy storage device 152 can be charged through the AC / DC converter of the controller 151 .

[0099] Second, energy recovery of operating machinery.

[0100] In this embodiment, the motor 123 is a motor generator, in other words, the motor 123 can output power when connected to a power source, and can generate power when receiving power input. The two working modes of the motor 123 can be switched by the controller 151.

[0101] The motor 123 has a power generation mode, and the hybrid system has a recovery mode. In the recovery mode, the controller 151 is configured to control the motor 123 to operate in the power generation mode, the motor 123 generates electricity, and the input end of the power switching device 110 is power-coupled with the first output end 112 or the second output end 113.

[0102] The recycling mode includes a first recycling mode and a second recycling mode;

[0103] In the first recovery mode, the controller 151 is configured to control the motor 123 to operate in the power generation mode, the motor 123 generates power, and the input end of the power switching device 110 is power-coupled to the first output end 112;

[0104] In the first recovery mode, the operating machine is moving, and the engine drives the drive shaft 132 to rotate, thereby driving the operating machine to move. When the brakes are applied, the engine may not work, and the drive shaft 132 transmits power to the motor 123 through the transmission mechanism. The motor 123 generates electricity to charge the energy storage device 152.

[0105] It can be understood that, through the coaxially connected motor 123, the braking energy can be easily recovered, the energy utilization efficiency is improved, and there is no need to set up a separate energy recovery generator 123. The transmission path between the motor 123 and the braking energy is short, and the recovery efficiency is high.

[0106] In the second recovery mode, the controller 151 is configured to control the engine to operate, control the motor 123 to operate in the power generation mode, the motor 123 generates electricity, and the input end of the power switching device 110 is power-coupled with the second output end.

[0107] In the second recovery mode, the upper operating system of the operating machine is operating, and the output power of the engine is greater than the required power of the hydraulic pump, then the motor 123 switches to the power generation mode, and the engine drives the motor 123 to generate electricity and operate the hydraulic pump at the same time.

[0108] It can be understood that the coaxially connected motor 123 can easily realize the distribution of the power output by the engine without the need for branch line transmission, which can improve the energy utilization efficiency and eliminate the need to set up a separate energy recovery generator 123. The transmission path between the motor 123 and the braking energy is short and the recovery efficiency is high.

[0109] The hybrid power system provided by the present invention can realize the following multiple working modes, wherein FIG4 shows the following first to eighth working modes, but the present application is not limited to these eight working modes, such as the energy recovery mode, and in addition to Figure 4 In addition to the pumping conditions listed above, there may be other operating conditions.

[0110] First, the hybrid power system provided by the present invention has a fuel driving mode.

[0111] In the fuel driving mode, the controller 151 is configured to control the operation of the engine, the coaxially connected motor 123 idles, the output end of the power source can input the power of the engine to the input end 111 of the power switching device 110, the input end 111 of the power switching device 110 is power-coupled with the first output end 112, and the drive shaft 132 is driven.

[0112] Secondly, the hybrid power system provided by the present invention has a fuel operation mode.

[0113] In the fuel operation mode, the controller 151 is configured to control the operation of the engine, the coaxially connected motor 123 idles, the output end of the power source can input the power of the engine to the input end 111 of the power switching device 110, the input end 111 of the power switching device 110 is power-coupled with the second output end 113, and the hydraulic pump is driven.

[0114] Thirdly, the hybrid power system provided by the present invention has a pure electric driving mode.

[0115] In the pure electric driving mode, the controller 151 is configured to control the engine to shut down, the motor 123 is powered by the energy storage device 152, the motor 123 is working, the output end of the power source can input the power of the motor 123 to the input end 111 of the power switching device 110, the input end 111 of the power switching device 110 is power-coupled with the first output end 112, and the drive shaft 132 is driven.

[0116] Fourthly, the hybrid power system provided by the present invention has a first pure electric operation mode.

[0117] In the first pure electric operation mode, the controller 151 is set to control the engine to shut down, the motor 123 is powered by the energy storage device 152, the motor 123 is working, the output end of the power source can input the power of the motor 123 to the second output end 113 of the power switching device 110, the input end 111 of the power switching device 110 is power-coupled with the second output end 113, and the hydraulic pump is driven.

[0118] Fifth, the hybrid power system provided by the present invention has a second pure electric operation mode.

[0119] In the second pure electric operation mode, the connector 153 is connected to an external power supply, the controller 151 is set to control the engine to shut down, the motor 123 is powered by the external power supply, the motor 123 is working, and the output end of the power source can input the power of the motor 123 to the input end 111 of the power switching device 110. The input end 111 of the power switching device 110 is power-coupled with the second output end 113, and the hydraulic pump is driven.

[0120] The hybrid power system provided by the invention has a hybrid mode. In the hybrid mode, the controller is configured to control the engine to work, and the energy storage device 152 supplies power to the motor 123, and the motor 123 works in the electric mode, and the input end 111 of the power switching device 110 is power-coupled with the first output end 112 or the second output end 113. When the motor 123 works in the electric mode, the motor 123 can convert electrical energy into mechanical energy.

[0121] The hybrid mode may include a hybrid driving mode and a first hybrid working mode.

[0122] Sixth, the hybrid power system provided by the present invention has a hybrid driving mode.

[0123] In the hybrid driving mode, the controller 151 is configured to control both the engine and the motor 123 to operate, the energy storage device 152 supplies power to the motor 123, the motor 123 operates in the electric mode, the output end of the power source can input hybrid power to the input end 111 of the power switching device 110, and the input end 111 of the power switching device 110 is power-coupled with the first output end 112 of the power switching device 110, and the drive shaft 132 is driven.

[0124] The controller 151 can control the speed and power of the engine and the motor 123, thereby improving the driving power and economy of the working machine.

[0125] Seventhly, the hybrid power system provided by the present invention has a first hybrid operation mode;

[0126] In the first hybrid operation mode, the controller 151 is configured to control the operation of the engine and the motor 123, the energy storage device 152 supplies power to the motor 123, the motor 123 operates in the electric mode, the output end of the power source can input hybrid power to the input end 111 of the power switching device 110, and the input end 111 of the power switching device 110 is power-coupled with the second output end 113 of the power switching device 110, and the hydraulic pump is driven.

[0127] The controller 151 can control the speed and power of the engine and motor 123 so that the output power of the hydraulic pump meets the operating requirements of the upper operating system (such as the pumping system), and the energy storage device 152 can supply power to complete the operation in areas where it is inconvenient to connect to electricity.

[0128] Eighth, the hybrid power system provided by the present invention has a second hybrid operation mode;

[0129] In the second hybrid operation mode, the controller 151 is configured to control the operation of the engine and the motor 123, and the external power supply connected to the plug connector supplies power to the motor 123. The motor 123 operates in the electric mode. The output end of the power source can input hybrid power to the input end 111 of the power switching device 110, and the input end 111 of the power switching device 110 is power-coupled with the second output end 113 of the power switching device 110, and the hydraulic pump is driven.

[0130] The controller 151 can control the speed and power of the engine and motor 123 so that the output power of the hydraulic pump meets the operating requirements of the upper operating system (such as a pumping system), and the external power supply can ensure long-term operation.

[0131] Ninth, the hybrid power system provided by the present invention has a power generation mode.

[0132] In the power generation mode, the controller 151 is configured to control the engine to work and control the motor 123 to enter the power generation mode, the engine drives the motor 123 to generate electricity, and the electricity generated by the motor 123 is stored in the energy storage device 152. When the motor 123 is controlled to enter the power generation mode, the motor 123 is used to convert mechanical energy into electrical energy.

[0133] Tenth, the hybrid power system provided by the present invention has a charging mode.

[0134] In the charging mode, the connector 153 is connected to an external power source, and the controller 151 controls the external power source to charge the energy storage device 152 .

[0135] Eleventh, the hybrid power system provided by the present invention has a braking energy recovery mode.

[0136] In the braking energy recovery mode, the controller 151 is configured to control the engine to work, control the motor 123 to generate electricity, and the input end of the power switching device 110 is power-coupled to the first output end 112;

[0137] When the operating machine is traveling, the engine 121 drives the drive shaft 132 to rotate, thereby driving the operating machine to travel. When the brake is applied, the drive shaft 132 transmits power to the motor 123 through the transmission mechanism, and the motor 123 generates electricity to charge the energy storage device 152.

[0138] It can be understood that, through the coaxially connected motor 123, the braking energy can be easily recovered, the energy utilization efficiency is improved, and there is no need to set up a separate energy recovery generator 123. The transmission path between the motor 123 and the braking energy is short, and the recovery efficiency is high.

[0139] In this application, the motor can idle when not in operation.

[0140] Based on any of the above embodiments, three embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0141] Embodiment 1

[0142] like Figure 1 As shown, the power source may further include a transmission 122 , the output end of the engine 121 is power-coupled to the input end of the transmission 122 , and the output end of the transmission 122 is coaxially connected to the motor 123 .

[0143] The motor 123 has a power generation mode, and the hybrid system has a charging mode; in the charging mode, the controller is configured to control the engine 121, the transmission 122 and the motor 123 to work simultaneously and the motor 123 works in the power generation mode.

[0144] In charging mode, the transmission 122 is engaged in the target gear (non-neutral gear), the driving motor 123 generates electricity to charge the energy storage device 152, and the input terminal 111 of the power switching device 110 is coupled with the second output terminal 113, that is, it works in pumping mode. At this time, the hydraulic pump can run idle without performing external work.

[0145] In this way, the hybrid power system does not need to change the internal connection structure of the traditional engine, and only needs to install the motor 123 on the outside, which is convenient for modification. When performing brake energy recovery, the power transmission path is short and the recovery efficiency is high.

[0146] The motor 123 can be installed on the transmission 122, or on the housing of the transmission 122. The power switching device 110 can be installed on the upper system. For the hybrid system, only the chassis needs to be replaced with a hybrid chassis, and the upper system does not need to be changed, so the replacement is simple and the cost is saved. Moreover, since the transmission 122 is provided, the speed change can be realized in both the driving condition and the pumping condition.

[0147] Embodiment 2

[0148] like Figure 2 As shown, the power source may further include a transmission 122, and the output end of the engine 121 is power-coupled to the input end of the transmission 122 through the motor 123. The engine 121 and the motor 123 are coaxially arranged, the output end of the motor 123 is power-coupled to the input end of the transmission 122, and the output end of the transmission 122 is power-coupled to the input end 111 of the power switching device 110.

[0149] In other words, the output end of the engine 121 is dynamically coupled to the motor shaft of the motor 123 , and the motor shaft of the motor 123 is dynamically coupled to the input end of the transmission 122 .

[0150] The motor 123 has a power generation mode, and the hybrid system has a charging mode; in the charging mode, the controller is configured to control the engine 121 and the motor 123 to work simultaneously and the motor 123 works in the power generation mode, and the transmission 122 is switched to neutral.

[0151] For this hybrid power system, after the transmission 122 switches to neutral, the engine 121 can directly drive the motor 123 to generate electricity, and store the electrical energy in the power storage device 152. During the entire power generation process, the hybrid power system does not need to perform external work, the power transmission path is short, and the power generation efficiency is higher.

[0152] The motor 123 can be installed on the transmission 122, or on the housing of the transmission 122. The power switching device 110 can be installed on the upper system. For the hybrid system, only the chassis needs to be replaced with a hybrid chassis, and the upper system does not need to be changed, so the replacement is simple and the cost is saved. Moreover, since the transmission 122 is provided, the speed change can be realized in both the driving condition and the pumping condition.

[0153] Embodiment 3

[0154] like Figure 3 As shown, the control circuit is electrically connected to the hydraulic pump. Figure 3 In the embodiment, the control circuit of the controller 151 is electrically connected to the boom pump 141 and the main oil pump 142 .

[0155] The controller 151 is configured to control the engine to operate when the motor 123 is operating and the engine is stopped, and when the control circuit determines that the power of the hydraulic pump is greater than the rated power of the motor 123 .

[0156] In this way, the hybrid system can automatically switch to the hybrid operation mode to achieve automatic engine intervention. Of course, the user can also manually control the engine operation to achieve manual switching of the hybrid.

[0157] For this hybrid power system, the controller 151 can monitor the working status of the hydraulic pump and automatically control the engine to intervene to avoid insufficient output power in the working mode of the motor 123.

[0158] It should be noted that, in the first pure electric operation mode, the controller 151 can monitor that the power of the hydraulic pump is greater than the rated power of the motor 123, or monitor that the increase rate of the hydraulic pump is greater than the target value, and can control the hybrid power system to enter the first hybrid operation mode.

[0159] In the second pure electric operation mode, the second hybrid operation mode is switched. The controller can monitor that the power of the hydraulic pump is greater than the rated power of the motor 123, or monitor that the increase rate of the hydraulic pump is greater than the target value, and can control the hybrid power system to switch into the second hybrid operation mode.

[0160] The invention also provides a working machine.

[0161] The operating machinery in the embodiment of the present invention may be an operating machinery such as a pump truck, a vehicle-mounted pump, a truck crane, an excavator, a pile driver, a concrete machine, a road roller, a mixer truck, a tunneling machine or a fire truck.

[0162] The working machine according to the embodiment of the present invention includes the hybrid power system of the working machine according to any one of the above embodiments.

[0163] According to the working machinery of the embodiment of the present invention, by arranging the motor 123 coaxially with the engine, hybrid power output can be easily achieved, and by switching the power switching device 110, switching of multiple power modes can be easily achieved, so that the working machinery can operate in multiple modes according to needs, and the energy efficiency in each mode is relatively high.

[0164] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hybrid power system for a working machine, characterized in that: include: A power switching device, the power switching device comprises an input end, a first input gear, a second input gear, a first transmission gear, a second transmission gear, a first output gear, a second output gear, a first output end, a second output end and a synchronizer, the first output end and the second output end are both selectively engageable with the input end of the power switching device, the first input gear and the second input gear are coaxially fixedly connected and fixedly connected to the input end of the power switching device, the first output gear is fixedly connected to the first output end; the first transmission gear and the second transmission gear are coaxially fixedly connected, the second transmission gear is meshed with the second output gear, and the second output gear is fixedly connected to the second output end; the synchronizer is used to control the first input gear to mesh with the first transmission gear, or the synchronizer is used to control the second input gear to mesh with the first output gear or to be power-coupled; A power source, the power source comprising an engine and a motor connected to the engine, the output end of the power source being power-coupledly connected to the input end of the power switching device; A driving shaft, the driving shaft is connected to the first output end by power coupling, and the driving shaft is used to drive the chassis to travel; A hydraulic pump is connected to the second output end by power coupling, and the hydraulic pump includes two or three of a main oil pump, a gear pump, and a boom pump.

2. The hybrid power system for a working machine according to claim 1, characterized in that: Also includes: Energy storage devices; A controller, wherein the controller comprises a control circuit and a DC / AC converter, wherein the control circuit is electrically connected to the engine and the energy storage device, and two ends of the DC / AC converter are electrically connected to the energy storage device and the motor respectively.

3. The hybrid power system for a working machine according to claim 2, characterized in that: The hybrid power system has a hybrid mode; In the hybrid mode, the controller is configured to control the engine to operate, while the energy storage device supplies power to the motor and the motor operates in electric mode, and the input end of the power switching device is power-coupled with the first output end or the second output end.

4. The hybrid power system for a working machine according to claim 2, characterized in that: The electric motor has a power generation mode, and the hybrid system has a recovery mode; In the recovery mode, the motor operates in the power generation mode, and the input end of the power switching device is power-coupled to the first output end or the second output end.

5. The hybrid power system for a working machine according to claim 2, characterized in that: Also includes: A plug connector for electrical connection to an external power source; The controller also includes an AC / DC converter and an AC / AC converter. The two ends of the AC / DC converter are electrically connected to the plug connector and the energy storage device respectively, and the two ends of the AC / AC converter are electrically connected to the plug connector and the motor respectively.

6. The hybrid power system for a working machine according to claim 5, characterized in that: The hybrid power system has a second hybrid operation mode; In the second hybrid operation mode, the controller is configured to control the engine to operate, the plug connector supplies power to the motor and the motor operates in electric mode, and the input end of the power switching device is power-coupled to the second output end.

7. The hybrid power system for a working machine according to claim 2, characterized in that: The control circuit is electrically connected to the hydraulic pump, and the controller is configured to operate the motor and stop the engine, and to control the engine to operate when the control circuit determines that the power of the hydraulic pump is greater than the rated power of the motor.

8. The hybrid power system of a working machine according to any one of claims 1 to 6, characterized in that: The power source further includes a transmission, the output end of the engine is connected to the input end of the transmission by power coupling, and the output end of the transmission is coaxially connected to the motor.

9. The hybrid power system of a working machine according to any one of claims 2 to 6, characterized in that: The power source also includes a transmission, the engine and the motor are coaxially arranged, the output end of the motor is dynamically coupled to the input end of the transmission, and the output end of the transmission is dynamically coupled to the input end of the power switching device.

10. The hybrid power system for a working machine according to claim 9, characterized in that: The motor has a power generation mode, and the hybrid system has a charging mode; In the charging mode, the controller is configured to control the engine and the motor to operate simultaneously and the motor to operate in a power generation mode, and the transmission is switched to neutral.

11. The hybrid power system of a working machine according to any one of claims 1 to 6, characterized in that: The power source further includes a transmission, and the motor is mounted on the transmission.

12. The hybrid power system of a working machine according to any one of claims 1 to 6, characterized in that: The power switching device includes a transfer case or a power take-off.

13. A working machine, characterized in that: A hybrid power system comprising a working machine according to any one of claims 1-12.

Images