Oil-electricity hybrid riding type mower

Abstract

The utility model relates to the technical field of mowers, and particularly discloses a gasoline-electric hybrid riding type mower which is characterized in that a mowing assembly, a walking assembly and a seat are all arranged on a frame, a battery pack and a gasoline engine generator are both connected with a whole vehicle energy distribution control assembly, and the whole vehicle energy distribution control assembly is further connected with the mowing assembly and the walking assembly; energy is distributed to all parts of the whole machine through the whole machine energy distribution control assembly, and mowing control and walking control are carried out; the battery pack is arranged on the rear portion of the seat, the gasoline engine generator is arranged on the rear portion of the battery pack, the battery pack and the gasoline engine generator are convenient to maintain, and bad experience brought to a user when the gasoline engine generator works is avoided. The gasoline engine generator is connected with the battery pack, so that the battery pack and the gasoline engine generator cooperatively supply power to the electric power system of the whole mower, and the advantage that the riding type mower supplies power through the battery pack and the gasoline engine generator is brought into full play.

Description

Technical Field

[0001] The present application relates to the technical field of lawn mowers, and in particular to an oil-electric hybrid riding lawn mower. Background Art

[0002] A riding lawn mower is an outdoor gardening equipment that is controlled by the operator while riding on the machine to mow the lawn. Currently, most riding lawn mowers use gasoline generators as their power source. Such gasoline generator riding lawn mowers generally use belt drive to transmit the movement of the engine output shaft to the mowing blade and drive wheel. Due to the large mechanical transmission loss, a gasoline generator with a larger rated power is required, which results in high noise, high fuel consumption, and high environmental pollution caused by the engine exhaust.

[0003] With the development of new energy technologies such as lithium-ion batteries and electronic controls, riding lawn mowers that use plug-in rechargeable lithium-ion battery packs as energy and use DC motors to drive the running wheels and mowing blades to rotate have also appeared on the market. This type of lithium-powered riding lawn mower has low noise, low transmission loss, and no pollution to the environment; however, due to cost and volume constraints, the capacity of the lithium-ion battery pack it is equipped with is limited, and due to the discharge characteristics of the lithium battery, its maximum output power is also limited; therefore, lithium-powered riding lawn mowers have problems such as insufficient battery life and insufficient mowing power.

[0004] A hybrid riding lawn mower that uses a gasoline generator and a battery pack can give full play to the quiet and environmentally friendly advantages of a battery pack and the long endurance and high power advantages of a gasoline generator. How to realize a hybrid riding lawn mower has become a technical problem that technicians in this field need to solve. Utility Model Content

[0005] The purpose of the present application is to provide an oil-electric hybrid riding lawn mower, which is used to realize oil-electric coordinated power supply for the riding lawn mower.

[0006] In order to solve the above technical problems, the present application provides a hybrid riding lawn mower, comprising: a frame, a vehicle energy distribution control component, a mowing component, a walking component, a seat, a battery pack, and a gasoline generator;

[0007] The mowing component, the walking component and the seat are all arranged on the frame, the battery pack and the gasoline generator are connected to the whole vehicle energy distribution control component, and the whole vehicle energy distribution control component is also connected to the mowing component and the walking component;

[0008] The battery pack is arranged at the rear of the seat, and the gasoline generator is arranged at the rear of the battery pack;

[0009] The gasoline generator is connected to the battery pack.

[0010] In some implementations, the gasoline generator has an independent gasoline power generation structure, and the gasoline generator is detachably connected to the vehicle frame and the vehicle energy distribution control assembly.

[0011] In some implementations, it also includes a mowing operation device and a walking operation device;

[0012] The mowing component includes a mowing controller and a mowing mechanism, the walking component includes a walking controller and a walking mechanism, the mowing controller is connected to the mowing mechanism and the mowing operating device, and the walking controller is connected to the walking mechanism and the walking operating device.

[0013] In some implementations, the vehicle energy distribution control assembly includes: a vehicle control unit, a power distribution unit, and a power supply control unit;

[0014] Wherein, the whole vehicle control unit is respectively connected to the controlled end of the mowing controller, the controlled end of the walking controller, the controlled end of the power distribution unit and the controlled end of the power supply controller;

[0015] The first voltage output terminal of the gasoline generator is connected to the voltage input terminal of the battery pack, the second voltage output terminal of the gasoline generator and the voltage output terminal of the battery pack are respectively connected to the voltage input terminal of the power supply circuit, the voltage output terminal of the power supply circuit is connected to the voltage input terminal of the power distribution unit, and the power output terminal of the power distribution unit is connected to the power supply terminal of the vehicle power system.

[0016] In some implementations, the power supply control unit includes a power supply circuit and a power supply controller;

[0017] Wherein, the power supply circuit includes a first power supply branch, a second power supply branch, a power supply trunk, a first branch switch, a second branch switch and a trunk switch;

[0018] Wherein, the first voltage output end of the gasoline generator and the second voltage output end of the gasoline generator are the same voltage output end and are connected to the voltage input end of the first power supply branch, the voltage output end of the first power supply branch is connected to the second end of the second power supply branch and the voltage input end of the power supply trunk, the voltage output end of the power supply trunk is connected to the voltage input end of the power distribution unit interface, the first charging end of the battery pack and the voltage output end of the battery pack are the same port connected to the first end of the second power supply branch;

[0019] The first branch switch is arranged on the first power supply branch, the second branch switch is arranged on the second power supply branch, the main road switch is arranged on the power supply main road, the communication end of the gasoline generator, the communication end of the battery pack, the communication end of the power distribution unit interface, the controlled end of the first branch switch, the controlled end of the second branch switch and the controlled end of the main road switch are respectively connected to the power supply controller.

[0020] In some implementations, it further includes a first current acquisition circuit and a second current acquisition circuit;

[0021] The input end of the first current acquisition circuit is connected to the second voltage output end of the gasoline generator, the input end of the second current acquisition circuit is connected to the battery pack, and the output end of the first current acquisition circuit and the output end of the second current acquisition circuit are respectively connected to the power supply controller.

[0022] In some implementations, the walking mechanism includes: two universal wheels, two drive wheels, a walking motor and a gear reduction box;

[0023] Among them, the two universal wheels are installed at the front part of the lower part of the frame, and the two driving wheels are installed at the rear part of the lower part of the frame; the controlled end of the universal wheel and the controlled end of the walking motor are respectively connected to the walking controller, the input end of the gear reduction box is connected to the output end of the walking motor, and the output end of the gear reduction box is linked to the driving wheel.

[0024] In some implementations, the walking operation device includes walking control levers provided on both sides of the seat and corresponding to the two universal wheels respectively.

[0025] In some implementations, further comprising a battery box;

[0026] The battery box is fixedly mounted on the frame, the battery pack is detachably mounted on the battery box, and the battery box is provided with a first conductive terminal, a second conductive terminal and a third conductive terminal;

[0027] The first conductive terminal is used to connect the battery pack with the first voltage output end of the gasoline generator and the power supply end of the vehicle power system, the second conductive terminal is used to connect the second charging end of the battery pack and the vehicle charger, and the third conductive terminal is used to connect the third charging end of the battery pack and a charging interface provided on the outside of the battery box for connecting an external charger.

[0028] In some implementations, the mowing assembly includes: a mowing disc, a mowing motor, and a mowing blade;

[0029] The mowing disc is installed on both sides of the front part of the frame, the mowing motor is installed on the upper part of the mowing disc, the mowing blade is fixed to the output shaft of the mowing motor, and the controlled end of the mowing motor is connected to the mowing controller.

[0030] The hybrid riding lawn mower provided in the present application includes: a frame, a vehicle energy distribution control component, a mowing component, a traveling component, a seat, a battery pack, and a gasoline generator; wherein the mowing component, the traveling component, and the seat are all arranged on the frame, the battery pack and the gasoline generator are all connected to the vehicle energy distribution control component, and the vehicle energy distribution control component is also connected to the mowing component and the traveling component, so that energy is distributed to various parts of the whole machine and mowing control and traveling control are performed through the vehicle energy distribution control component; the battery pack is arranged at the rear of the seat, and the gasoline generator is arranged at the rear of the battery pack, so that it is convenient to maintain the battery pack and the gasoline generator, and to avoid a bad experience for the user when the gasoline generator is working; the gasoline generator is connected to the battery pack, so that the battery pack and the gasoline generator work together to supply power to the vehicle power system, giving full play to the advantages of powering the riding lawn mower by the battery pack and by the gasoline generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic structural diagram of a hybrid riding lawn mower provided in an embodiment of the present application;

[0033] Figure 2 A side view of a hybrid riding lawn mower provided in an embodiment of the present application;

[0034] Figure 3 A top view of a hybrid riding lawn mower provided in an embodiment of the present application;

[0035] Figure 4 for Figure 1 Schematic diagram of the installation of the battery pack and gasoline generator;

[0036] Figure 5 A schematic diagram of charging a hybrid riding lawn mower provided in an embodiment of the present application;

[0037] Figure 6 A schematic diagram of a battery pack connected to an external charger provided in an embodiment of the present application;

[0038] Figure 7A schematic diagram of the structure of a gasoline generator provided in an embodiment of the present application;

[0039] Figure 8 A power supply circuit diagram of a hybrid riding lawn mower provided in an embodiment of the present application;

[0040] Fig. 9 A flow chart of a control method for a hybrid riding lawn mower provided in an embodiment of the present application;

[0041] Among them, 101 is the frame, 102 is the energy distribution control component of the whole vehicle, 103 is the seat, 104 is the battery pack, 105 is the gasoline generator, 106 is the universal wheel, 107 is the driving wheel, 108 is the mowing blade, 109 is the mowing motor, 110 is the display screen, 111 is the control panel, 112 is the battery box, 113 is the travel control lever, 114 is the front light, 115 is the seat adjustment switch, 116 is the charging interface, 117 is the external charger; 601 is the external charging device; 701 is the fuel tank, 702 is the air filter, 703 is the electronic rectifier, 704 is the generator, and 705 is the muffler. DETAILED DESCRIPTION

[0042] The core of the present application is to provide an oil-electric hybrid riding lawn mower, which is used to realize oil-electric coordinated power supply for the riding lawn mower.

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0044] Figure 1 A schematic structural diagram of a hybrid riding lawn mower provided in an embodiment of the present application; Figure 2 A side view of a hybrid riding lawn mower provided in an embodiment of the present application; Figure 3 A top view of a hybrid riding lawn mower provided in an embodiment of the present application; Figure 4 for Figure 1 Schematic diagram of the installation of the battery pack and gasoline generator; Figure 5 A schematic diagram of charging a hybrid riding lawn mower provided in an embodiment of the present application; Figure 6 A schematic diagram of a battery pack connected to an external charger provided in an embodiment of the present application; Figure 7 A schematic diagram of the structure of a gasoline generator provided in an embodiment of the present application.

[0045] like Figure 1As shown, the hybrid riding lawn mower provided in the embodiment of the present application includes: a frame 101, a vehicle energy distribution control component 102, a mowing component, a walking component, a seat 103, a battery pack 104, and a gasoline generator 105;

[0046] Among them, the mowing component, the walking component, and the seat 103 are all arranged on the frame 101, the battery pack 104 and the gasoline generator 105 are connected to the vehicle energy distribution control component 102, and the vehicle energy distribution control component 102 is also connected to the mowing component and the walking component;

[0047] The battery pack 104 is disposed at the rear of the seat 103 , and the gasoline generator 105 is disposed at the rear of the battery pack 104 ;

[0048] The gasoline generator 105 is connected to the battery pack 104 .

[0049] In a specific implementation, the hybrid riding lawn mower provided in the embodiment of the present application may further include a mowing operation device and a walking operation device;

[0050] Among them, the mowing component includes a mowing controller and a mowing mechanism, the walking component includes a walking controller and a walking mechanism, the mowing controller is connected to the mowing mechanism and the mowing operating device, and the walking controller is connected to the walking mechanism and the walking operating device.

[0051] In order to realize the control of the hybrid riding lawn mower, the vehicle energy distribution control component 102 includes: a vehicle control unit (VCU), a power distribution unit (PDU) and a power supply control unit;

[0052] The vehicle control unit is respectively connected to the controlled end of the mowing controller, the controlled end of the walking controller, the controlled end of the power distribution unit and the controlled end of the power supply controller;

[0053] The first voltage output terminal of the gasoline generator 105 is connected to the voltage input terminal of the battery pack 104, the second voltage output terminal of the gasoline generator 105 and the voltage output terminal of the battery pack 104 are respectively connected to the voltage input terminal of the power supply circuit, the voltage output terminal of the power supply circuit is connected to the voltage input terminal of the power distribution unit, and the power output terminal of the power distribution unit is connected to the power supply terminal of the vehicle power system.

[0054] The walking controller and the mowing controller may be implemented by the same controller or by different controllers, specifically a microcontroller unit (MCU).

[0055] like Figure 2As shown, the walking mechanism may include: two universal wheels 106, two driving wheels 107, a walking motor and a gear reduction box; wherein, the two universal wheels 106 are installed at the front portion below the frame 101, and the two driving wheels 107 are installed at the rear portion below the frame 101; the controlled ends of the universal wheels 106 and the controlled ends of the walking motors are respectively connected to the walking controller, the input end of the gear reduction box is connected to the output end of the walking motor, and the output end of the gear reduction box is linked to the driving wheels 107.

[0056] Specifically, two sets of travel motors and reduction gearboxes can be installed at the bottom of the frame 101 near the rear of the vehicle, a drive wheel 107 is installed on the output shaft of the reduction gearbox, and two sets of universal wheels 106 are installed at the bottom of the frame 101 near the front of the vehicle. The travel controller is used to receive the travel control signal of the user on the hybrid riding lawn mower transmitted by the travel operating device. Figure 1 , Figure 2 As shown, the walking operation device may include walking control levers 113 provided on both sides of the seat 103 and corresponding to the two universal wheels 106. In addition, the walking operation device may also be other structures. After the walking control signal transmitted by the walking operation device, the walking controller controls the running of the walking motor to drive the driving wheel 107 and the universal wheel 106 to move forward, backward, turn, etc. In particular, when one rear wheel stops or reverses at a low speed and the other rear wheel rotates forward, a zero-radius turning action of the lawn mower can be achieved.

[0057] like Figure 3 As shown, the mowing device may include: a mowing disc 108, a mowing motor 109 and a mowing blade; wherein the mowing disc 108 is installed on both sides of the front of the frame 101, the mowing motor 109 is installed on the upper part of the mowing disc 108, the mowing blade is fixed to the output shaft of the mowing motor 109, and the controlled end of the mowing motor 109 is connected to the mowing controller.

[0058] Specifically, a height-adjustable mowing disc 108 is suspended at the bottom of the frame 101 near the middle of the vehicle, and one to three sets of mowing motors 109 and mowing blades are installed on the mowing disc 108. The mowing controller is used to receive the mowing control signal of the user for the hybrid riding lawn mower transmitted by the mowing operating device. The mowing operating device can be a mowing control lever provided at the seat 103, and the user can adjust the height of the mowing disc 108 and the rotation speed of the mowing blade by adjusting the mowing control lever. Or, Figure 3As shown, the hybrid riding lawn mower provided in the embodiment of the present application may also include a display screen 110 and a control panel 111 disposed on the side of the seat 103; wherein the control panel 111 is provided with a mowing control switch; the input end of the display screen 110 and the output end of the control panel 111 are respectively connected to the lawn mower control unit. The output end of the control panel 111 may be specifically connected to the mowing controller. The display screen 110 may adopt a liquid crystal display (HMI), and the control panel 111 may adopt a membrane keyboard. In addition to the mowing control switch, the control panel 111 may also be provided with a mode selection switch (such as the power supply mode selection of the gasoline generator 105, the battery pack 104, and the hybrid power supply, or the walking mode selection of the hybrid riding lawn mower moving forward at a constant speed or moving forward along a fixed route, etc.), a power switch, an external charging port, etc. After receiving the mowing control signal transmitted by the mowing operation device, the mowing controller drives the mowing disc 108 by controlling the mowing motor 109, and the mowing disc 108 drives the cutting edge of the mowing blade to rotate at a high speed to perform mowing operations.

[0059] Thus, the user can input control signals to the vehicle control unit through the control panel 111 to control the movement and mowing actions of the vehicle.

[0060] like Figure 4 As shown, on the frame 101, the control system and power supply circuit including the battery pack 104, the on-board charger and the gasoline generator 105 are respectively installed on the lower side of the seat 103, and the control system and power supply system of the hybrid riding lawn mower are conveniently protected and maintained. Since the gasoline generator 105 releases a large amount of heat when working and is discharged through the exhaust pipe, the lawn mower control unit, the battery pack 104, the on-board charger and other devices with less heat generation are deployed near the seat 103, and the gasoline generator 105 is installed at a position of the frame 101 near the rear of the hybrid riding lawn mower to avoid the gasoline generator 105 from heating up and harming the user when working, and to facilitate the exhaust gas to be discharged through the short exhaust pipe.

[0061] like Figure 3 and Figure 4As shown, in the hybrid riding lawn mower provided in the embodiment of the present application, the battery pack 104 can be a lithium-ion battery pack, which can be specifically deployed at the upper part of the frame 101 near the rear of the vehicle. To facilitate maintenance of the battery pack 104, the hybrid riding lawn mower provided in the embodiment of the present application can also include a battery box 112; the battery box 112 is fixed to the frame 101, and the battery pack 104 can be detachably installed in the battery box 112, and the battery box 112 is provided with a first conductive terminal, a second conductive terminal and a third conductive terminal; the first conductive terminal is used to connect the battery pack 104 with the first voltage output terminal of the gasoline generator 105 and the power supply terminal of the vehicle power system, the second conductive terminal is used to connect the second charging terminal of the battery pack 104 and the vehicle charger, and the third conductive terminal is used to connect the third charging terminal of the battery pack 104 and the charging interface 116 provided outside the battery box 112 for connecting the external charger 117. Specifically, the battery pack 104 can be detachably installed in the battery box 112 , and the installation position of the battery pack 104 in the battery box 112 is located behind the seat 103 , so that the battery pack 104 can be easily taken out.

[0062] like Figure 2 and Figure 3 As shown, in order to facilitate charging of the battery pack 104 through an external power source, the hybrid riding lawn mower provided in the embodiment of the present application includes a charging interface 116 arranged on the outside of the battery box 112 (such as the side of the frame 101), and the number of the charging interface 116 may not be limited to one, and is used to connect an external charger 117 or an external power source.

[0063] The battery pack 104 can be charged in three ways, including but not limited to: the gasoline generator 105 charges the battery pack 104, the on-board charger is connected to an external power source to charge the battery pack 104, and the external charger 117 is connected to the external power source through the charging interface 116 to charge the battery pack 104. Among them, the gasoline generator 105 is converted into electrical energy after combustion, and the output voltage is connected to the first charging end (first conductive terminal) of the battery pack 104 through the voltage output end and the charging circuit. If a car charger is used to charge the battery pack 104, the car charger has a built-in charging circuit and is connected to the second charging end (second conductive terminal) of the battery pack 104 through a power distribution unit, and the other end of the car charger is directly connected to the external power source through the charging interface 116. Figure 5As shown, if an external charger 117 is used to charge the battery pack 104, the charging interface 116 provided on the outside of the battery box 112 (such as the side of the frame 101) is connected to the third charging end (third conductive terminal) of the battery pack 104, and the user can charge the battery pack 104 by connecting the charging interface 116 and an external power source through the external charger 117. In addition, by setting the battery pack 104 to be detachably mounted on the battery box 112, the user can also remove the battery pack 104 from the battery box 112 and connect the battery pack 104 to the external charging device 601 (the charging head draws power from the mains) for charging.

[0064] The battery pack 104 can adopt the structure of the current universal battery pack 104 for garden machinery, so as to enhance the versatility and be interoperable with other garden machinery.

[0065] like Figure 1 , Figure 3 , Figure 4 As shown, in the hybrid riding lawn mower provided in the embodiment of the present application, the gasoline generator 105 can be installed on the upper part of the frame 101 near the rear of the entire vehicle to avoid heat and burning the seat 103 during operation.

[0066] In the hybrid riding lawn mower provided in the embodiment of the present application, the gasoline generator 105 can be a gasoline generator with an independent gasoline power generation structure, and the gasoline generator 105 is detachably connected to the frame 101 and the vehicle energy distribution control component 102. For example, the gasoline generator 105 is a gasoline generator with electronic starting and shutdown functions, and can be a small four-stroke gasoline generator 105, whose output end is connected to the power distribution unit. Figure 7 As shown, the gasoline generator 105 may include: a fuel tank 701, an air filter 702, an electronic rectifier 703, a generator 704 and a muffler 705, forming a set of DC gasoline generators.

[0067] Specifically, both the gasoline generator 105 and the battery pack 104 can supply power to the load of the hybrid riding lawn mower through the power distribution unit. The power distribution unit can control the power supply mode of the gasoline generator 105 and the battery pack 104 according to the power of the battery pack 104, the oil level in the fuel tank, and the power supply mode input by the user through the control panel 111, so as to avoid problems such as insufficient battery life or loud noise caused by using a single power supply mode.

[0068] In addition, if Figure 3 As shown, the hybrid riding lawn mower provided in the embodiment of the present application may further include a seat adjustment switch 115 disposed on the side of the seat 103 , and an output end of the seat adjustment switch 115 is connected to the lawn mower control unit.

[0069] In addition, the hybrid riding lawn mower provided in the embodiment of the present application may also include a headlight lighting system. Figure 1 As shown, the vehicle lighting system may include a plurality of front vehicle lights 114 disposed on the front side of the vehicle frame 101. The vehicle lighting system may also include a decorative light bar disposed on the front of the vehicle frame 101, a tail light and a brake light disposed on the rear of the vehicle frame 101, and a working light disposed in the middle of the vehicle frame 101. The controlled end of the vehicle lighting system may be connected to the vehicle control unit, and the user may input a control signal to the vehicle control unit through the control panel 111 to select the vehicle lights to be turned on.

[0070] The hybrid riding lawn mower provided in the embodiment of the present application includes: a frame 101, a whole vehicle energy distribution control component 102, a mowing component, a walking component, a seat 103, a battery pack 104, and a gasoline generator 105; wherein the mowing component, the walking component, and the seat 103 are all arranged on the frame 101, the battery pack 104 and the gasoline generator 105 are all connected to the whole vehicle energy distribution control component 102, and the whole vehicle energy distribution control component 102 is also connected to the mowing component and the walking component, so that the whole machine is distributed to each part through the whole vehicle energy distribution control component 102. The gasoline generator 105 is connected to the battery pack 104, so that the battery pack 104 and the gasoline generator 105 can be used to supply power to the whole vehicle power system, giving full play to the advantages of power supply by the battery pack 104 and the gasoline generator 105 on the riding lawn mower.

[0071] The hybrid riding lawn mower provided in the embodiment of the present application may include three power supply modes: pure electric mode, pure oil mode and hybrid mode. A voltage threshold may be set as a basis for distinguishing different power supply modes.

[0072] Specifically, a power switch can be set to control the power on and off of the power supply system of the hybrid riding lawn mower. When the power switch is turned off, the battery pack 104 can be charged through the external charger 117 or the vehicle charger through the charging interface 116. When the power switch is turned on, the power supply system of the hybrid riding lawn mower is powered on, and the vehicle control unit reads the parameters of each unit of the hybrid riding lawn mower and displays them on the human-computer interaction display screen. The power distribution unit reads the power level and working mode of the battery pack 104, and specifically can set different low-voltage thresholds of the battery pack 104 according to whether the mowing motor 109 is working. For example, the first low-voltage threshold is set to the voltage that the battery pack 104 needs to be charged when the mowing motor 109 is working, and the second low-voltage threshold is set to the voltage that the battery pack 104 needs to be charged when the mowing motor 109 is not working.

[0073] When the hybrid riding lawn mower is in the pure electric working mode, the power distribution unit does not start or shut down the gasoline generator 105 , and the whole machine is powered by the battery pack 104 .

[0074] When the lawn mower is in hybrid working mode, the power distribution unit monitors in real time whether the battery pack 104 reaches the low voltage threshold and the whole machine discharge power; when at least one of the conditions that the battery pack 104 voltage is lower than the low voltage threshold in the current working mode and the whole machine discharge power is greater than the high current power threshold is met, the power distribution unit starts the gasoline generator 105.

[0075] After the gasoline generator 105 is started, power is supplied to each unit through the power distribution unit. At this time, according to the working conditions, the power distribution unit intelligently controls the power supply of the whole machine and the charging and discharging of the battery pack 104.

[0076] Based on this, the hybrid riding lawn mower can include four working modes:

[0077] In working mode 1, the discharge power of the whole machine is less than the high current power threshold, and the voltage of the battery pack 104 is higher than the low voltage threshold and lower than the high voltage threshold in the current working mode. At this time, the gasoline generator 105 supplies power to the whole machine and the battery pack 104 at the same time, and the battery pack 104 is charged.

[0078] In working mode 2, the discharge power of the whole machine is less than the high current power threshold, and the voltage of the battery pack 104 is higher than the high voltage threshold. At this time, the power distribution unit turns off the gasoline generator 105; the battery pack 104 stops charging and turns to supply power to the whole machine.

[0079] In working mode three, the discharge power of the whole machine is greater than the high current power threshold, and the voltage of the battery pack 104 is higher than the low voltage threshold and lower than the high voltage threshold in the current working mode. At this time, the battery pack 104 stops charging; the gasoline generator 105 and the battery pack 104 supply power to the whole machine at the same time.

[0080] In working mode four, the discharge power of the whole machine is greater than the high current power threshold, and the voltage of the battery pack 104 is lower than the low voltage threshold. At this time, the power distribution unit limits the power output of the mowing motor 109 and the walking motor, and the gasoline generator 105 works at full power to provide power to the whole machine and charge the battery pack 104 with a small current at the same time.

[0081] In addition, the hybrid riding lawn mower provided in the embodiment of the present application may also include a forced engine start switch. When the user turns on the forced engine start switch, the power distribution unit forces the gasoline generator 105 to start, and the entire machine is powered by the gasoline generator 105. The start and stop of the gasoline generator 105 and the charging and discharging of the battery pack 104 are managed according to the logic after the engine is automatically started in the hybrid working mode, so as to adapt to the scenario requirements where the gasoline generator 105 is not started but the user needs to start the gasoline generator 105.

[0082] Figure 8 A power supply circuit diagram of a hybrid riding lawn mower provided in an embodiment of the present application.

[0083] To realize the hybrid power supply mode of the oil-electric hybrid riding lawn mower provided in the embodiment of the present application, in the oil-electric hybrid riding lawn mower provided in the embodiment of the present application, the power supply control unit may include a power supply circuit and a power supply controller, and the power supply circuit may include a first power supply branch, a second power supply branch, a power supply trunk, a first branch switch, a second branch switch, and a trunk switch;

[0084] Among them, the first voltage output end of the gasoline generator 105 and the second voltage output end of the gasoline generator 105 are the same voltage output end and are connected to the voltage input end of the first power supply branch, the voltage output end of the first power supply branch is connected to the second end of the second power supply branch and the voltage input end of the power supply trunk, the voltage output end of the power supply trunk is connected to the voltage input end of the power distribution unit interface, and the first charging end of the battery pack 104 and the voltage output end of the battery pack 104 are the same port connected to the first end of the second power supply branch;

[0085] The first branch switch is arranged on the first power supply branch, the second branch switch is arranged on the second power supply branch, the main road switch is arranged on the power supply main road, the communication end of the gasoline generator 105, the communication end of the battery pack 104, the communication end of the power distribution unit interface, the controlled end of the first branch switch, the controlled end of the second branch switch and the controlled end of the main road switch are respectively connected to the power supply controller.

[0086] like Figure 8 As shown, the power supply controller may adopt a microcontroller unit U1 (MCU), and the microcontroller unit U1 is powered by a 5V DC power supply.

[0087] P1 is the voltage output terminal P1 of the gasoline generator 105, ER+ and ER- are respectively the positive and negative electrodes of the voltage output terminal P1P1 of the gasoline generator 105, and ER_COM is the communication interface of the voltage output terminal P1P1 of the gasoline generator 105, which is connected to the engine communication pin ER_COM of the micro control unit U1. A first power supply branch is set corresponding to the gasoline generator 105, and the first power supply branch is connected in series with a first branch switch, which can include NMOS tubes Q1 and NMOS tubes Q2, the drain of the NMOS tube Q1 is connected to the positive electrode ER+ of the voltage output terminal P1P1 of the gasoline generator 105, the source of the NMOS tube Q1 is connected to the source of the NMOS tube Q2, the drain of the NMOS tube Q2 is connected to the voltage input terminal of the power supply trunk, the gate of the NMOS tube Q1 and the gate of the NMOS tube Q2 are both connected to the collector of the transistor Q7, the emitter of the transistor Q7 is grounded, and the base of the transistor Q7 is connected to the engine control pin ER_OUT of the micro control unit U1.

[0088] BAT+ and BAT- are respectively the positive and negative electrodes of the battery pack 104, and BAT_COM is the communication interface of the battery pack 104, which is connected to the battery pack 104 communication pin BAT_COM of the micro control unit U1. A second power supply branch is set corresponding to the battery pack 104, and the second power supply branch is connected in series with a second branch switch, which may include NMOS tubes Q3 and NMOS tubes Q4, the drain of the NMOS tube Q3 is connected to the positive electrode of the battery pack 104, the source of the NMOS tube Q3 is connected to the source of the NMOS tube Q4, the drain of the NMOS tube Q4 is connected to the voltage input end of the power supply trunk, the gate of the NMOS tube Q3 and the gate of the NMOS tube Q4 are both connected to the collector of the transistor Q9, the emitter of the transistor Q9 is grounded, and the base of the transistor Q9 is connected to the battery pack 104 control pin BAT_OUT of the micro control unit U1.

[0089] P2 is the power distribution unit interface, PDU+ and PUD- are the positive and negative electrodes of the power distribution unit interface P2 respectively, and PDU_COM is the communication interface of the power distribution unit interface P2, which is connected to the power distribution unit communication pin PDU_COM of the micro control unit U1. The first end of the power distribution unit is connected to the power supply trunk, and the second end of the power distribution unit interface P2 is connected to the load circuit.

[0090] A main road switch is connected in series on the power supply main road, and the main road switch may include an NMOS tube Q5 and an NMOS tube Q6. The drain of the NMOS tube Q5 is connected to the drain of the NMOS tube Q2 and the drain of the NMOS tube Q4, the source of the NMOS tube Q5 is connected to the source of the NMOS tube Q6, the drain of the NMOS tube Q6 is connected to the positive electrode of the power distribution unit, the gate of the NMOS tube Q5 and the gate of the NMOS tube Q6 are connected to the collector of the transistor Q8, the emitter of the transistor Q8 is grounded, and the base of the transistor Q8 is connected to the main road control pin D_OUT of the micro control unit U1.

[0091] In order to accurately control the charging of the battery pack 104 and the power supply to the entire vehicle, the hybrid riding lawn mower provided in the embodiment of the present application may also include a first current acquisition circuit and a second current acquisition circuit; the input end of the first current acquisition circuit is connected to the second voltage output end of the gasoline generator 105, the input end of the second current acquisition circuit is connected to the battery pack 104, and the output end of the first current acquisition circuit and the output end of the second current acquisition circuit are respectively connected to the power supply controller.

[0092] like Figure 8 As shown, the first current acquisition circuit is built based on an operational amplifier U1B, the negative input terminal of the operational amplifier U1B is connected to the negative electrode ER- of the voltage output terminal P1 of the gasoline generator 105, the positive input terminal of the operational amplifier U1B is connected to the reference voltage Vref 2.5V, and the output terminal of the operational amplifier U1B is connected to the engine current acquisition pin CUR_ER of the micro control unit U1.

[0093] The second current acquisition circuit is built based on the operational amplifier U1A, the negative input terminal of the operational amplifier U1A is connected to the negative pole BT- of the battery pack 104, the positive input terminal of the operational amplifier U1A is connected to the reference voltage Vref 25V, and the output terminal of the operational amplifier U1A is connected to the battery pack 104 current acquisition pin CUR_BT of the micro control unit U1.

[0094] Based on the power supply circuit provided in the embodiment of the present application, the working process in the discharge mode may include:

[0095] In the standby state, the power distribution unit does not work, and the micro control unit U1 controlled by the power distribution unit does not work. After booting up, the power distribution unit is activated by pulling up the power distribution unit interface P2D_COM, the micro control unit U1 is powered on and communicates with the power distribution unit through D_COM to identify the current working mode, and reads the status information of the battery pack 104 through BT_COM, such as whether charging is allowed, whether discharging is allowed, the current power, etc.

[0096] When the working mode is pure electric mode, the microcontroller unit U1 only needs to discharge or stop discharge control according to the state of the battery pack 104. When the battery pack 104 allows discharge, Q3, Q4, Q5, and Q6 are turned on by pulling up BT_OUT to supply power to the load circuit (the power unit of the hybrid riding lawn mower). When the machine is shut down or the battery pack 104 is undervoltage or overtemperature, Q3, Q4, Q5, and Q6 are turned off.

[0097] When the working mode is hybrid mode, the micro control unit U1 reads the power and temperature information of the battery pack 104 through BT_COM, reads the information of the gasoline generator 105 through ER_COM, reads the working mode, discharge current and other status information of the power distribution unit through D_COM, and opens the Q5 and Q6 power supply circuits when the tool needs power supply.

[0098] When the lawn mower motor 109 is not started, the microcontroller unit U1 identifies that if the power level of the battery pack 104 is less than 20%, or the discharge current is greater than 60A, the gasoline generator 105 is started through ER_COM, and the first power supply branch is turned on by pulling up ER_OUT to turn on Q1 and Q2, and the second power supply branch Q3 and Q4 is turned on by pulling up BT_OUT to charge the battery pack 104. When the power level of the battery pack 104 is greater than 80%, the gasoline generator 105 is turned off, Q1 and Q2 are turned off, but Q3 and Q4 are still turned on to allow the battery pack 104 to continue to supply power to the load circuit.

[0099] When the lawn mowing motor is started, the microcontroller unit U1 identifies that if the power level of the battery pack 104 is less than 45%, or the discharge current is greater than 60A, it starts the gasoline generator 105, and turns off Q1 and Q2 when the power level of the battery pack 104 is greater than 80% and the total machine current is less than 60A, while Q3 and Q4 are still turned on to allow the battery pack 104 to continue to supply power to the load circuit.

[0100] During charging, the microcontroller unit U1 samples the charging current of the battery pack 104 through R11 via the second current acquisition circuit, and amplifies the signal through the U1A circuit. The microcontroller unit U1 obtains the current current by reading CUR_BT for analog-to-digital conversion; at the same time, the microcontroller unit U1 also communicates with the battery pack 104 through BT_COM to obtain information such as the voltage and temperature of the battery pack 104; when the charging current exceeds the set value, or the charging voltage exceeds the set value, Q4 and Q5 are turned off to stop charging. For example, for the 15S2P battery pack 104, the charging overcurrent value is set to 12A, the overcharge voltage is set to 4.25V / single cell, and the response time is 1 second. For the 15S3P battery pack 104, the charging overcurrent value is set to 18A, and other parameters are the same.

[0101] During charging, the microcontroller unit U1 controls the output voltage of the gasoline generator 105 through ER_COM to control the charging current to the battery pack 104, so that the gasoline generator 105 supplies power to the load circuit first, that is, the excess output power of the gasoline generator 105 will be used to charge the battery pack 104.

[0102] The working process in charging mode may include:

[0103] When the microcontroller unit U1 recognizes that the external charger 117 is connected through the ER_COM communication signal, it is in pure charging mode. The charging control logic is the same as the charging control in the discharge mode. At this time, Q5 and Q6 are turned off to prohibit the power unit of the hybrid riding lawn mower from working, so as to avoid damage caused by the operation of the mowing device when the external charger 117 or external power supply is connected for charging.

[0104] Fig. 9 A flow chart of a control method for a hybrid riding lawn mower provided in an embodiment of the present application.

[0105] Based on the above embodiments, Fig. 9 As shown, the control method of the hybrid riding lawn mower provided in the embodiment of the present application can be applied to the lawn mower control unit and can include:

[0106] S901: Power on the entire device.

[0107] S902: Control the battery pack to discharge.

[0108] S903: Turn off the gasoline generator.

[0109] S904: Determine whether the engine mode is forced to start; if yes, proceed to S909; if no, proceed to S905.

[0110] S905: Determine whether it is a hybrid mode, if yes, proceed to S906; if no, proceed to S902.

[0111] S906: Setting a low voltage threshold of the battery pack according to the current working state of the lawn mowing motor.

[0112] S907: Determine whether the power level of the battery pack is lower than the low voltage threshold; if yes, proceed to S909; if no, proceed to S908.

[0113] S908: Determine whether the whole machine discharge power is greater than the high current power threshold; if yes, proceed to S909; if no, proceed to S902.

[0114] S909: Start the gasoline generator.

[0115] S910: Determine whether it is a hybrid mode; if yes, proceed to S911; if no, proceed to S917.

[0116] S911: Control the gasoline generator to supply power.

[0117] S912: Determine whether the whole machine discharge power is greater than the high current power threshold; if yes, proceed to S913; if no, proceed to S918.

[0118] S913: Setting a low voltage threshold of the battery pack according to the current working state of the lawn mowing motor.

[0119] S914: Determine whether the power level of the battery pack is lower than the low voltage threshold; if yes, proceed to S915; if no, proceed to S916.

[0120] S915: After the discharge power of the whole machine is controlled to drop to the high current power threshold, the gasoline generator is operated to charge the battery pack, the discharge of the battery pack is stopped, and the process proceeds to S910.

[0121] S916: Stop charging the battery pack, control the battery pack to discharge, and enter S910.

[0122] S917: Determine whether the engine mode is forced to start; if yes, proceed to S911; if no, proceed to S902.

[0123] S918: Determine whether the power level of the battery pack is lower than the high voltage threshold; if yes, proceed to S919; if no, proceed to S902.

[0124] S919: Control the gasoline generator to charge the battery pack and stop discharging the battery pack.

[0125] In the above steps, S902, S903, S904 are no branches, and S905 is no branch, which is loop 1, corresponding to the hybrid riding lawn mower being in pure electric mode, and the gasoline generator is not turned on at this time. S905 is a branch, S906, S907 are no branches, S908 is no branch, and S902 is loop 2, corresponding to the situation where the power of the whole machine is low and the battery pack is fully charged. At this time, only the battery pack is used for power supply, and the gasoline generator is not turned on. S904 and S917 are both forced engine start modes. The condition for turning on the gasoline generator is to meet at least one of the conditions of high vehicle power, insufficient battery pack power, and forced engine start. In hybrid mode, the condition for turning off the gasoline generator is to meet the conditions of low vehicle power and full battery pack. S918 is a branch for loop 4, corresponding to the situation where the power of the whole vehicle is lower than that of the battery pack is not fully charged. At this time, only the gasoline generator is used for power supply, and the battery pack is charged. The yes branch of S914 and loop 5 of S915 correspond to the situation that the vehicle power is high. If the battery pack is insufficient at this time, the vehicle will reduce the power and only use the gasoline generator for power supply and charge the battery pack. The no branch of S914 and loop 6 of S916 correspond to the situation that the vehicle power is high and the battery pack is sufficient. At this time, the battery pack and the gasoline generator together supply power to the vehicle.

[0126] The above is a detailed description of a hybrid riding lawn mower provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

[0127] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0128] It should also be noted that, in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

Claims

1. A hybrid riding lawn mower, characterized in that: include: Vehicle frame (101), vehicle energy distribution control component (102), mowing component, walking component, seat (103), battery pack (104), gasoline generator (105); The mowing component, the walking component and the seat (103) are all arranged on the frame (101); the battery pack (104) and the gasoline generator (105) are all connected to the whole vehicle energy distribution control component (102); and the whole vehicle energy distribution control component (102) is also connected to the mowing component and the walking component; The battery pack (104) is arranged at the rear of the seat (103), and the gasoline generator (105) is arranged at the rear of the battery pack (104); The gasoline generator (105) is connected to the battery pack (104).

2. The hybrid riding lawn mower according to claim 1, characterized in that: The gasoline generator (105) has an independent gasoline power generation structure, and the gasoline generator (105) is detachably connected to the vehicle frame (101) and the whole vehicle energy distribution control component (102).

3. The hybrid riding lawn mower according to claim 1, characterized in that: It also includes a mowing operating device and a walking operating device; The mowing component includes a mowing controller and a mowing mechanism, the walking component includes a walking controller and a walking mechanism, the mowing controller is connected to the mowing mechanism and the mowing operating device, and the walking controller is connected to the walking mechanism and the walking operating device.

4. The hybrid riding lawn mower according to claim 3, characterized in that: The whole vehicle energy distribution control component (102) comprises: a whole vehicle control unit, a power distribution unit and a power supply control unit; The vehicle control unit is respectively connected to the controlled end of the mowing controller, the controlled end of the walking controller, the controlled end of the power distribution unit and the controlled end of the power supply controller; The first voltage output end of the gasoline generator (105) is connected to the voltage input end of the battery pack (104), the second voltage output end of the gasoline generator (105) and the voltage output end of the battery pack (104) are respectively connected to the voltage input end of the power supply circuit, the voltage output end of the power supply circuit is connected to the voltage input end of the power distribution unit, and the power output end of the power distribution unit is connected to the power supply end of the vehicle power system.

5. The hybrid riding lawn mower according to claim 4, characterized in that: The power supply control unit includes a power supply circuit and the power supply controller; Wherein, the power supply circuit includes a first power supply branch, a second power supply branch, a power supply trunk, a first branch switch, a second branch switch and a trunk switch; The first voltage output end of the gasoline generator (105) and the second voltage output end of the gasoline generator (105) are the same voltage output end and are connected to the voltage input end of the first power supply branch; the voltage output end of the first power supply branch is connected to the second end of the second power supply branch and the voltage input end of the power supply trunk; the voltage output end of the power supply trunk is connected to the voltage input end of the power distribution unit interface; the first charging end of the battery pack (104) and the voltage output end of the battery pack (104) are the same port connected to the first end of the second power supply branch; The first branch switch is arranged on the first power supply branch, the second branch switch is arranged on the second power supply branch, the main road switch is arranged on the power supply main road, and the communication end of the gasoline generator (105), the communication end of the battery pack (104), the communication end of the power distribution unit interface, the controlled end of the first branch switch, the controlled end of the second branch switch and the controlled end of the main road switch are respectively connected to the power supply controller.

6. The hybrid riding lawn mower according to claim 5, characterized in that: It also includes a first current collection circuit and a second current collection circuit; The input end of the first current acquisition circuit is connected to the second voltage output end of the gasoline generator (105), the input end of the second current acquisition circuit is connected to the battery pack (104), and the output end of the first current acquisition circuit and the output end of the second current acquisition circuit are respectively connected to the power supply controller.

7. The hybrid riding lawn mower according to claim 3, characterized in that: The walking mechanism comprises: two universal wheels (106), two driving wheels (107), a walking motor and a gear reduction box; The two universal wheels (106) are installed at the front portion below the vehicle frame (101), and the two driving wheels (107) are installed at the rear portion below the vehicle frame (101); the controlled ends of the universal wheels (106) and the controlled ends of the travel motors are respectively connected to the travel controller, the input end of the gear reduction box is connected to the output end of the travel motor, and the output end of the gear reduction box is linked to the driving wheels (107).

8. The hybrid riding lawn mower according to claim 7, characterized in that: The walking operation device comprises walking control rods (113) arranged on both sides of the seat (103) and corresponding to the two universal wheels (106) respectively.

9. The hybrid riding lawn mower according to claim 5, characterized in that: Also included is a battery box (112); The battery box (112) is fixedly mounted on the vehicle frame (101); the battery pack (104) is detachably mounted on the battery box (112); and the battery box (112) is provided with a first conductive terminal, a second conductive terminal, and a third conductive terminal; The first conductive terminal is used to connect the battery pack (104) with a first voltage output terminal of the gasoline generator (105) and a power supply terminal of the vehicle power system; the second conductive terminal is used to connect a second charging terminal of the battery pack (104) and a vehicle charger; and the third conductive terminal is used to connect a third charging terminal of the battery pack (104) and a charging interface (116) provided outside the battery box (112) for connecting to an external charger.

10. The hybrid riding lawn mower according to claim 3, characterized in that: The mowing assembly comprises: a mowing disc (108), a mowing motor (109) and a mowing blade; The mowing disc (108) is installed on both sides of the front of the vehicle frame (101), the mowing motor (109) is installed on the upper part of the mowing disc (108), the mowing blade is fixed to the output shaft of the mowing motor (109), and the controlled end of the mowing motor (109) is connected to the mowing controller.

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