WO2020051829A1 - Moteur avec commutateur de démarreur intégré - Google Patents

Moteur avec commutateur de démarreur intégré Download PDF

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Publication number
WO2020051829A1
WO2020051829A1 PCT/CN2018/105456 CN2018105456W WO2020051829A1 WO 2020051829 A1 WO2020051829 A1 WO 2020051829A1 CN 2018105456 W CN2018105456 W CN 2018105456W WO 2020051829 A1 WO2020051829 A1 WO 2020051829A1
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WO
WIPO (PCT)
Prior art keywords
starter motor
engine
power source
power tool
switch component
Prior art date
Application number
PCT/CN2018/105456
Other languages
English (en)
Inventor
Albert Liu
Original Assignee
Briggs & Stratton Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Briggs & Stratton Corporation filed Critical Briggs & Stratton Corporation
Priority to PCT/CN2018/105456 priority Critical patent/WO2020051829A1/fr
Publication of WO2020051829A1 publication Critical patent/WO2020051829A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/026—Cleaning by making use of hand-held spray guns; Fluid preparations therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/087—Details of the switching means in starting circuits, e.g. relays or electronic switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00309—Overheat or overtemperature protection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
    • B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
    • B08B2203/0241—Combustion motor pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0803—Circuits or control means specially adapted for starting of engines characterised by means for initiating engine start or stop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0862—Circuits or control means specially adapted for starting of engines characterised by the electrical power supply means, e.g. battery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N2011/0881—Components of the circuit not provided for by previous groups
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery

Definitions

  • the present invention generally relates to internal combustion engines including electric starting systems and outdoor power equipment powered by such engines, such as pressure washers, lawn mowers, snow throwers, portable generators, etc. More specifically, the present invention relates to small internal combustion engines including electric starting systems powered by a removable, rechargeable lithium-ion battery.
  • the engine includes an engine block including a cylinder, a piston configured to reciprocate within the cylinder, a crankshaft coupled to the piston and configured to rotate about a crankshaft axis, a power source comprising at least two voltage output terminals, a starter motor configured to crank the crankshaft and start the engine upon receiving power from the power source, and a power tool switch component configured to selectively provide power from the power source to the starter motor.
  • the power tool switch component includes a housing, a user interface, a printed circuit board assembly positioned within the housing, a first set of terminals electrically connected to the power source, and a second set of terminals electrically connected to the starter motor.
  • the printed circuit board assembly includes one or more circuits having machine-executable instructions configured to control operation of the starter motor and the power tool switch component.
  • the pressure washer includes an internal combustion engine, a water pump coupled to the engine, the water pump including a pump inlet for receiving a fluid from a common fluid source and a pump outlet for supplying a pressurized primary fluid, a spray gun configured to be fluidly coupled to the fluid outlet of the water pump, the spray gun including a spray gun outlet for providing an output fluid flow from the spray gun, a power source having at least two voltage output terminals, a starter motor configured to crank the crankshaft and start the engine upon receiving power from the power source, and a power tool switch component configured to selectively provide power from the power source to the starter motor.
  • the power tool switch component includes a housing, a user interface configured to receive an input from a user, a printed circuit board assembly positioned within the housing, the printed circuit board including one or more circuits having machine-executable instructions configured to control operation of the starter motor and the power tool switch component, a first set of terminals electrically connected to the at least two voltage output terminals of the power source, and a second set of terminals electrically connected to the starter motor.
  • the electric starting system includes a battery having one or more battery cells, a battery receptacle configured to receive the battery, a starter motor configured to start the engine, and a switch and control circuit housed within a switch housing.
  • the switch is provided between the battery and the starter motor and is movable between a closed position and an open position.
  • the switch allows a user to selectively provide power from the battery to the starter motor by providing user input to a user interface.
  • the control circuit is electrically coupled to the switch, the rechargeable battery, and the starter motor, and controls the operations of the switch and the rechargeable battery.
  • the rechargeable battery and the starter motor are selectively connected and power is supplied to the starter motor when the switch is in the closed position.
  • FIG. 1 is a schematic diagram of an internal combustion engine including an electric starting system, according to an exemplary embodiment of the invention.
  • FIG. 2 is a schematic diagram of the circuit board used in the electric starting system of FIG. 1.
  • FIG. 3 is a schematic diagram of the control circuit used in the electric starting system of FIG. 1.
  • FIG. 4 is a perspective view of a pressure washer for use with the engine and electric starting system of FIG. 1.
  • FIG. 5 is a schematic diagram of an electric starting system.
  • FIG. 6 is a schematic diagram of an electric starting system.
  • FIG. 7 is a graph depicting the motor current, voltage, and speed over time using a battery pack for use with the electric starting system.
  • FIG. 8 is a graph depicting the motor current, voltage, and speed over time using a battery pack for use with electric starting system.
  • FIG. 9 is a graph depicting the motor current, voltage, and speed over time using a battery pack for use with electric starting system.
  • FIG. 10 is a graph depicting the motor current, voltage, and speed over time using a battery pack for use with electric starting system.
  • FIG. 11 is a perspective view of a lawn mower for use with the engine and electric starting system of FIG. 1.
  • FIG. 12 is an example schematic diagram of a circuit board used in the electric starting system of FIG. 1.
  • the electric starting system includes a switch operable by a user to supply power to a power source to activate the starter motor, thereby cranking the crankshaft and starting the engine.
  • the switch includes circuitry (e.g., a printed circuit board assembly, control circuits) housed within the switch housing to control the supply of power from the power source to the starter motor.
  • the circuitry is used to monitor and control aspects of the electric starting system including the power source, switch, and starter motor.
  • Outdoor power equipment includes lawn mowers, riding tractors, snow throwers, pressure washers, tillers, log splitters, zero-turn radius mowers, walk-behind mowers, riding mowers, stand-on mowers, pavement surface preparation devices, industrial vehicles such as forklifts, utility vehicles, commercial turf equipment such as blowers, vacuums, debris loaders, over-seeders, power rakes, aerators, sod cutters, brush mowers, etc.
  • Outdoor power equipment may, for example, use an electric motor to drive an implement, such as a rotary blade of a lawn mower, a pump of a pressure washer, the auger of a snow thrower, and/or a drivetrain of the outdoor power equipment.
  • the electric starting system 10 for starting an internal combustion engine 106 is shown, according to an exemplary embodiment.
  • the electric starting system 10 includes a starter motor 16, a power source 14, and a switch 12.
  • a user input 50 e.g., push-button, switch
  • the starter motor 16 rotates the crankshaft 110 to start the engine 106.
  • the switch 12 includes a circuit board or power source management system 18 housed within a switch housing 20. As described further herein, based on the user input, the circuit board 18 regulates the supply of power from the power source 14 to the starter motor 16.
  • the starter motor 16 is selectively coupled to the crankshaft 110 so that the starter motor 16 may be decoupled from the crankshaft 110 (e.g., i.e., does not rotate with the crankshaft 110 after the engine 106 has been successfully started) .
  • the switch 12 includes a switch used to selectively supply power from a battery to a motor on a power tool (e.g., drill, saw, angle grinder, etc. ) . Accordingly, as referred to herein, in some embodiments, the switch 12 is a power tool switch component 12.
  • the power tool switch component 12 includes the circuit board 18 housed within the switch housing 20.
  • the circuit board 18 includes a printed circuit board assembly and includes one or more circuits have machine-executable instructions configured to control operation of the starter motor 16 and the power tool switch component 12.
  • the power tool switch component 12 includes a first set of terminals (e.g., terminals 29 shown in FIGS. 1 and 6) electrically connected to voltage output terminals of the power source 14 and a second set of terminals (e.g., terminals 27 shown in FIGS. 1 and 6) electrically connected to the starter motor 16.
  • the user interacts with the power tool switch component 12 using a user interface (e.g., user interface 182 shown in FIG. 4) as described further herein.
  • the circuit board 18 and circuits By including the circuit board 18 and circuits, the user interface (e.g., user interface 182 described further herein) , and first and second sets of terminals in a single unit (e.g., single housing 20) with the power tool switch component 12, the assembly of the engine 106 and electric starting system 10 is simplified.
  • the power tool switch component 12 can be easily electrically connected and disconnected from the power source 14 and starter motor 16.
  • the power tool switch component 12 is positioned on a billboard of a pressure washer (e.g., billboard 150 of pressure washer 100 shown in FIG. 4) . In some embodiments, the power tool switch component 12 is housed within a billboard of a pressure washer (e.g., housed within billboard housing 152 of pressure washer 100 shown in FIG. 4) . In some embodiments, the power tool switch component 12 is positioned on a handle of a walk-behind lawn mower proximate a bail lever (e.g., switch component 1112 positioned on handle 1118 proximate bail 1126 on lawn mower 1100 shown in FIG. 11) . In some embodiments, the power tool switch component 12 is mounted on the engine 106.
  • the power tool switch component 12 is positioned on a control panel of a piece of outdoor power equipment. In some embodiments, the power tool switch component 12 is housed within a power source housing (e.g., power source housing 42 shown in FIG. 1 and described further herein) .
  • a power source housing e.g., power source housing 42 shown in FIG. 1 and described further herein.
  • the power source 14 is a removable and rechargeable lithium-ion battery pack.
  • the battery has a nominal voltage of 20 volts (V) .
  • the battery can include other nominal voltages, such as 18 V.
  • the power source 14 can be inserted and removed from a battery receptacle 22 (e.g., port, socket, pocket, etc. ) .
  • the battery receptacle 22 includes terminals configured to couple with corresponding terminals of the power source 14.
  • the receptacle 22 also includes another set of terminals configured to be coupled to corresponding terminals of a wiring harness (e.g., wiring harness 120 shown in FIG.
  • the battery receptacle 22 is mounted to outdoor power equipment (e.g., pressure washer 100 shown in FIG. 4) at a location (e.g., billboard 150 shown in FIG. 4) remote from (separate from, spaced apart from) , the engine 106. In other embodiments, the battery receptacle 22 can be mounted on the engine.
  • the power source 14 includes a battery having one or more lithium-ion cells 40 electrically coupled together.
  • a housing 42 contains and supports the lithium-ion cells 40 and any processing electronics contained within the power source 14.
  • the housing 42 includes a display and user interface. The overall dimensions of the housing 42 correspond to those of the receptacle 22 described above such that the power source 14 can be received by the receptacle 22.
  • the power source 14 includes a power source interface 30 configured to communicably and operatively couple the power source 14 to the other components of the electric starting system 10.
  • the interface 30 includes one or more voltage output terminals.
  • the interface 30 is configured to provide information communication between the power source 14 and other components described herein.
  • the power source interface 30 can include any number of terminals and communication interfaces (e.g., interfaces 32, 34, 36, 38 shown in FIG. 2) .
  • the power source 14 can send or receive any information relating to the performance or operation of the power source 14 via the interfaces 32, 34, 36, 38. Such information can include, but is not limited to, voltage, current, impedance, cycle life use, number of years left in the use of the battery pack, and number of cycles.
  • the communication can be one-way or two-way communication.
  • the interface 30 includes a positive terminal 32 (e.g., B+) , a negative temperature coefficient (NTC) thermistor 34 electrically coupled to the positive terminal 32, a negative terminal 38 (e.g., B-) , and an identification (ID) resistor 36 coupled to the negative terminal 38.
  • the NTC thermistor 34 provides cell temperature data to the circuit board 18 as described below.
  • the power source interface 30 can include more or fewer components.
  • the circuit board 18 is configured to engage, disengage, control, and/or otherwise communicate with components of the power source 14 and/or the starter motor 16.
  • the circuit board 18 includes one or more circuits configured to monitor, communicate with, and control the various components described herein.
  • the one or more circuits on the circuit board 18 control the operation of the starter motor 16 and the power tool switch component 12.
  • the one or more circuits also provide communication of information between the starter motor 16 and power source 14 in various embodiments.
  • the circuit board 18 includes a pack voltage circuit 62, a cell temperature circuit 64, an ID circuit 66, and a current control circuit or power switch 68.
  • the circuit board 18 can include more or fewer circuits.
  • the pack voltage circuit 62 monitors the voltage output of the power source 14.
  • the pack voltage circuit 62 is thus coupled to the power source 14 to receive the output voltage.
  • the pack voltage circuit 62 monitors both the input voltage and the output voltage of the power source 14.
  • the cell temperature circuit 64 is configured to detect the temperature of the cells within the power source 14.
  • the cell temperature circuit 64 is thus coupled to the NTC terminal of the power source 14.
  • the cell temperature circuit 64 can detect the cell temperature prior to high current flow only, where temperature rise is limited during one start cycle of the electric starting system 10 (e.g., maximum of a few seconds) . In some embodiments, the cell temperature circuit 64 detects the cell temperature during an engine starting period and evaluates the cell temperature data to determine the voltage variation and use that determination as a reference when detecting cell temperature data during operation of the power source 14.
  • the identification circuit 66 is configured to detect an ID resistor value from the power source 14 (e.g., from ID resistor 36) to determine the type of power source or battery pack electrically connected to the circuit board 18 (e.g., via the receptacle 22) .
  • the current control circuit or power switch 68 uses a field-effect transistor (FET) 74 to control the discharge supplied to the starter motor 16.
  • FET field-effect transistor
  • the circuit board 18 is configured to receive current data from the power source 14 (e.g., battery cells) regarding the current being drawn from and/or being provided to the switch 12 by the power source 14.
  • the circuit board 18 may be configured to monitor the current draw and compare the current draw to a target current level (e.g., a current threshold, etc. ) .
  • a target current level e.g., a current threshold, etc.
  • the circuit board 18 may be additionally or alternatively configured to monitor a charge current and compare the charge current to a target current level (e.g., a current threshold, etc. ) .
  • the circuit board 18 can also include a heat sink configured to transfer heat away from the various components of the circuit board 18 (e.g., power switch 68) .
  • a state of charge indication for the power source 14 is based on the battery pack start voltage.
  • the circuit board 18 uses discharge control, the circuit board 18 provides under-voltage protection, for example, at less than 2.75 V plus or minus 100 millivolts (mV) per battery cell 40 at low power loading (e.g., less than 1.0 Amps (A) ) , at less than 2.0 V plus or minus 100 mV per battery cell 40 with loading, at less than 1.5 V plus or minus 100 mV per battery cell 40 with loading and a temperature of 0 degrees Celsius.
  • the sampling frequency is not to exceed one sample per every 100 milliseconds.
  • the circuit board 18 also provides over-temperature protection, with a maximum temperature threshold.
  • the temperature threshold can include 70 degrees Celsius nominal or 80 degrees Celsius actual. The temperature is to be measured immediately at user interface interaction prior to current flow (unless the current is less than 1 Amp continuous) , after which the sampling period for the temperature measurements are not to exceed one sample every one second. There may be no lower temperature threshold requirement.
  • the maximum current after an input release is defined by the shelf life requirement of approximately nine months after completion of discharge. For example, for a remaining capacity of 100 milliampere-hours (mAh) , the approximate limit would be 15 microamperes. In some embodiments, the maximum current for a stuck trigger condition is two milliamperes, which is defined based on 48 hours of runtime assuming a remaining capacity of approximately 100 mAh after discharge.
  • the circuit board 18 includes a processor and a memory (e.g., RAM, ROM, Flash Memory, hard disk storage, etc. ) .
  • the processor may be implemented as a general-purpose processor, an application specific integrated circuit ( “ASIC” ) , one or more field programmable gate arrays ( “FPGAs” ) , a digital signal processor ( “DSP” ) , a group of processing components, or other suitable electronic processing components.
  • the memory may include multiple memory devices.
  • the memory may store data and/or computer code for facilitating the various processes described herein.
  • the memory may be communicably connected to the processor and provide computer code or instructions to the processor for executing the processes described in regard to the circuit board 18 herein.
  • the memory may be or include tangible, non-transient volatile memory or non-volatile memory. Accordingly, the memory may include database components, object code components, script components, or any other type of information structure for supporting the various activities and information structures described herein.
  • the circuit board 18 is coupled to a governor of the engine 106 (e.g., speed sensor, load sensor) , and disengages the starter motor 16 (e.g., cuts power to the starter motor 16, high-side switching of the power source, low-side switching of the ground side of the circuit) when the engine 106 is running at a sufficient speed or experiencing a predetermined sensed load threshold.
  • the switch 12 may be controlled automatically with a control input from the circuit board 18.
  • the circuit board 18 may receive an engine speed input and open the switch 12 when the engine speed input indicates that the engine has reached a predetermined speed threshold, thereby breaking the electrical connection between the power source 14 and the starter motor 16.
  • the circuit board 18 is configured to perform a soft start process to prevent potential problems related to an in-rush current experienced by the starter motor 16 upon being started.
  • the circuit board 18 uses pulse width modulation speed control to perform the soft start process. In doing so, the circuit board 18 drives the starter motor 16 with a series of ON-OFF pulses and varies the duty cycle of the pulses while keeping the frequency constant.
  • the circuit board 18 can implement other control mechanisms to perform the soft start process of the motor 16.
  • the soft start period is related to a predetermined time period after the starter motor 16 is started, such that during the predetermined time period, the electric starting system 10 uses the soft start process.
  • the soft start period is related to a predetermined motor speed, where until the starter motor 16 reaches a predetermined motor speed, the electric starting system 10 uses the soft start process.
  • a separate soft start circuit or switch is configured to perform the soft start process.
  • the soft start circuit is a time delay switch that switches after the predetermined period of time.
  • the soft start circuit is a relay that is actuated by the circuit board 18 upon the starter motor 16 reaching a predetermined speed. Using a soft start process can help with mechanical and gear engagement and reduce an in-rush current. In this way, the engine 106 can be more easily started under heavier loads. In addition, the likelihood of damage to the starter motor 16 due to a high influx of current is reduced using the soft start process.
  • the circuit board 18 receives additional or different inputs used to control starting of the engine.
  • the circuit board 18 includes a timer and is configured to deactivate the starter motor 16 if the engine 106 has not started within a predetermined amount of time.
  • the circuit board 18 monitors the starter motor current and an elapsed time period to determine that the engine 106 has started and opens the switch 12 to disable the starter motor 16. For example, the circuit board 18 receives an indication that 300 milliseconds has passed and the starter motor current has dropped to below 10 A, determines that the engine 106 has started and disables the starter motor 16 by opening the switch 12.
  • the circuit board 18 monitors the amount of time a user interface (e.g., user interface 182 shown in FIG. 4) is activated (e.g., depressed) and if the engine 106 has not started after a predetermined amount of time (e.g., five seconds) , the circuit board 18 terminates the discharge cycle and requires another restart operation.
  • a user interface e.g., user interface 182 shown in FIG. 4
  • a predetermined amount of time e.g., five seconds
  • the circuit board 18 also includes a switch debounce circuit configured to rectify the bounce occurring between mechanical contacts during closing of the switch 12.
  • a single user input with the switch 12 e.g., user depresses a push button once
  • the switch debounce circuit is configured to filter out the multiple signals that may be caused by a bounce occurring during switch closing such that a single input signal is received when the switch 12 is closed (e.g., push button is depressed) . By debouncing the switch in this way, the likelihood of the occurrence of an electrical short may be reduced.
  • the starter motor 16 may be any type of starter motor 16 used to start an engine 106.
  • the maximum torque for the motor may exceed 2500 milli-Newton-meters (mNm) and the maximum speed may be approximately 3000 revolutions per minute (RPM) .
  • the locked rotor current which is the current the motor 16 develops when it is started from zero and reaches a maximum speed, is less than 60 A. In some embodiments, the locked rotor current for the motor 16 is less than 100 A.
  • the pressure washer 100 includes a base unit 102 with a frame 104 supporting an internal combustion engine 106 and a water pump 108 (e.g., positive displacement pump, piston water pump, axial cam pump) .
  • the internal combustion engine 106 includes an engine block 114 having a cylinder 116, a piston 118, and a crankshaft 110.
  • the piston 118 reciprocates in the cylinder 116 along a cylinder axis 115 to drive the crankshaft 110.
  • the crankshaft 110 rotates about a crankshaft axis 111. As shown in FIG.
  • the engine 106 further includes a fuel system for supplying an air-fuel mixture to the cylinder 116 (e.g., a carburetor, an electronic fuel injection system, etc. ) , an air filter assembly 164, a cylinder head assembly 166, a muffler assembly 168, a fuel tank assembly 170, and a flywheel and fan assembly.
  • a fuel system for supplying an air-fuel mixture to the cylinder 116 e.g., a carburetor, an electronic fuel injection system, etc.
  • an air filter assembly 164 e.g., a carburetor, an electronic fuel injection system, etc.
  • a cylinder head assembly 166 e.g., a cylinder head assembly 166
  • a muffler assembly 168 e.g., a fuel tank assembly 170
  • a flywheel and fan assembly e.g., a flywheel and fan assembly.
  • the pressure washer 100 further includes a spray gun 112 that is coupled to the water pump 108 with a delivery conduit (e.g., a high-pressure hose) .
  • a delivery conduit e.g., a high-pressure hose
  • the engine 106 is fastened to the top of a base plate 122 of the frame 104 and the water pump 108 is mounted below the base plate 122 and connected to a power takeoff of the engine 106 via a hole through the base plate 122.
  • the water pump 108 is directly coupled to and supported by the engine 106.
  • the water pump 108 is coupled (e.g., directly coupled, indirectly coupled by a transmission, belts, gears, or other drive system) to the engine 106 to be driven by the engine 106.
  • the water pump 108 is configured to be coupled to the power takeoff of the engine 106. Accordingly, the speed of the pump 108 can be a function of the speed of the engine 106. As shown in FIG. 4, pressure washer 100 uses a vertical shaft engine. According to an alternative embodiment, the engine may be a horizontal shaft engine.
  • the water pump 108 includes a pumping mechanism to pressurize water passing through the water pump 108 (e.g., water pressurized in a range between 50 pounds per square inch (psi) and 4200 psi) .
  • the water pump 108 may be any variety of pumps capable of pumping a liquid (e.g., a centrifugal pump, a positive displacement pump, etc. ) .
  • the water pump 108 includes a pump inlet 126 and a pump outlet 128. The water pump 108 draws in low-pressure water at the pump inlet 126 and expels pressurized water at the pump outlet 128.
  • the pump inlet 126 is configured to be coupled to a supply conduit or hose, which is in turn connected to a fluid supply (e.g., a spigot connected to a municipal water supply or well) .
  • the pump inlet 126 includes a low-pressure, garden-hose style fitting for coupling a garden hose to the pump inlet 126.
  • the pump outlet 128 includes a high-pressure fitting (e.g., an M22 fitting) for coupling the pump outlet 128 to the delivery conduit or other device including an appropriate high pressure fitting.
  • the pressure washer 100 is portable and includes wheels 132 and a handle 134.
  • the spray gun 112 includes a handle 136 and a nozzle 138.
  • High pressure water is provided to the spray gun 112 from the pump outlet 128 through the delivery conduit, which is coupled to the spray gun 112 via an inlet 140.
  • the inlet 140 may be a threaded fitting, such as a high-pressure fitting (e.g., an M22 fitting) .
  • the stream of water output from the nozzle 138 can be started or stopped by a user applying pressure to a trigger 142.
  • the spray gun 112 allows the user to manage the direction of the stream of water independent of the location and orientation of the base unit 102 and the duration of the stream of water.
  • the spray gun 112 may be configured to be grasped with two hands, with one hand being placed on the handle 136 and a second hand being placed on a grip portion 144 provided by a body 146 (e.g., barrel, housing, etc. ) .
  • the grasping of the spray gun 112 with two hands allows a user to have greater control of the stream of water expelled from the nozzle 138.
  • the pressure washer 100 further includes a billboard 150 mounted on the frame 104.
  • the billboard 150 includes a billboard housing 152.
  • the billboard 150 includes a user interface 182 (e.g., push-button, switch, button, touchscreen, etc. ) operable by a user to start the pressure washer 100.
  • the switch 12 is closed and power is supplied from the power source 14 to the starter motor 16 to start the engine 106.
  • the switch 12 includes the circuit board 18 within the switch housing 20 housed within the billboard housing 152. In other embodiments, the switch 12 including the circuit board 18 housed within switch housing 20 is positioned on the billboard 150. In other embodiments, the switch 12 can be otherwise positioned.
  • the power source 14 can be inserted and removed from the receptacle 22.
  • the power source 14 is electrically coupled to a wiring harness 120, which is electrically coupled to the starter motor 16.
  • the user interface 182 includes a push-button.
  • the user depresses the push-button, which closes the switch 12 to complete an electrical connection between the power source 14 and the starter motor 16.
  • the push-button may include a variable depth switch. Accordingly, the user may be required to depress the button a predetermined distance in order to close the switch 12 and start the engine 106. As such, if the user depresses the button a distance less than the predetermined distance, the switch 12 will not close and the engine 106 will not start.
  • engine 106 of the pressure washer 100 may be started via actuation of a trigger 142 on a spray gun 112.
  • Additional circuitry may be included with the circuit board 18 described above to facilitate such a system.
  • a flow switch may be included, which senses water flow through the system.
  • an ON time delay circuit may be included, which detects the amount of time that a user has actuated trigger 142 and prevents starting of the engine if a predetermined time period has not elapsed (e.g., during incidental user contact with trigger 142) .
  • an OFF time delay circuit may be included, which allows the engine 106 to continue running for a predetermined period of time after the user has released trigger 142.
  • circuitry that senses if the starter motor pinion gear has disengaged from the engine’s flywheel gear while the starter motor is cranking so as to prevent the starter motor from stopping the cranking operation prior to the engine being started is included.
  • the electric starting system 210 includes a starter motor 16, a power source 14, and a user interface 182 (e.g., push-button switch) .
  • a user interface 182 e.g., push-button switch
  • the switch 12 closes and power is supplied from the power source 14, through the power source interface 30, to the starter motor 16 to start the engine 106.
  • the switch 12 includes a circuit board 18 in the form of a printed circuit board assembly 25.
  • the printed circuit board assembly 25 is housed within a switch housing (e.g., switch housing 20 shown in FIG. 1) .
  • the printed circuit board assembly 25 can include any or all of the components of the circuit board 18 described above. Based on the user input, the circuit board 18 regulates the supply of power from the power source 14 to the starter motor 16. The circuit board 18 may terminate all power to the motor 16 and printed circuit board assembly to reduce a standby current.
  • the electric starting system 310 includes a starter motor 16, a power source 14, and a switch 312 in the form of a switch typically used to selectively supply power from a power source to a motor on a power tool, such as a drill, saw, angle grinder, etc. (e.g., power tool switch) .
  • a power tool such as a drill, saw, angle grinder, etc.
  • the switch 312 closes and power is supplied from the power source 14, through the power source interface 30, to the starter motor 16 to start the engine 106.
  • the switch 312 includes a circuit board 18 housed within the power tool switch housing (e.g., switch housing 20 shown in FIG. 1) . Based on the user input, the circuit board 18 regulates the supply of power from the power source 14 to the starter motor 16.
  • the current, motor voltage, and speed characteristics may vary.
  • graphs 700, 800 shown in FIGS. 7-8 show the motor 16 in use with a 1.3 Ah battery pack.
  • the motor start in-rush current may be approximately 60 A at 200 milliseconds.
  • the cell impedance is higher during lower temperatures and the running current is approximately 15-20 A.
  • the graphs 900, 1000 shown in FIGS. 9-10 show the motor 16 in use with a 4.0 Ah battery back.
  • the motor start in-rush current may be approximately 80 A at 200 milliseconds.
  • the cell impedance is higher during lower temperatures and the running current is approximately 15-20 A.
  • outdoor power equipment in the form of a lawn mower 1100, includes an internal combustion engine 1106 coupled to a rotary tool, such as the blade in a deck 1114 of the lawn mower 1100, an auger, a saw, tines, a drill, a pump, or other rotary tools.
  • the lawn mower 1100 further includes wheels 1116 and a rearward extending handle 1118 designed to be pushed by a user walking behind the lawn mower 1100.
  • the outdoor power equipment may be in the form of a rotary tiller, a pressure washer, a snow thrower, a lawn tractor or riding mower, an edger, a portable generator, or other equipment, with a corresponding powered tool, such as tines, a pump, an auger and impeller, an alternator, a drive train, or other tools.
  • the lawn mower 1100 includes an electric starting system 1110.
  • the starter system includes a starter motor that is selectively coupled to the engine 1106 such that the electric motor is configured to rotate the crankshaft of the engine 1106 to start the engine 1106.
  • a user may engage the starter system 1110 via the handle 1118 of the lawn mower 1100.
  • the handle 1118 includes a switch component 1112 (e.g., power tool switch component) including a housing 1120 and having a user interface 1182 in the form of a button, toggle, lever or other interface that the user may use to command the starter system 1110 to start the engine 1106.
  • the starter system 1110 is integrated with a bail 1126 of the lawn mower 1100.
  • the user interface 1182 is positioned proximate the bail 1126.
  • a brake mechanism e.g., friction brake, ignition interrupt switch or circuit, etc.
  • the user may need to activate the bail 1126 and activate the user interface 1182 to start the engine 1106.
  • the power source 14 includes one or more lithium-ion cells 40 electrically coupled together.
  • a power source housing 42 contains and supports the lithium-ion cells 40 and any processing electronics contained within the power source 14.
  • the power source interface 30 includes a positive terminal 32 (e.g., B+) , a negative temperature coefficient (NTC) thermistor 34 electrically coupled to the positive terminal 32, a negative terminal 38 (e.g., B-) , and an identification (ID) resistor 36 coupled to the negative terminal 38.
  • the NTC thermistor 34 provides cell temperature data to the circuit board 18.
  • the interface 30 can include more or fewer components.
  • switches including AC-Switch 2247, mechatronic switch 2267, electronic switch 2508, reversible brush ring 2015, compact BLDC controller 2811, DC potentiometer switch 2722, electronic switch 2711, electronic switch 2717, AC module 2074, EC control 2810, and EC control 2810; or DNA switches, including compact trigger switch and trigger switch with LION controls; Shanghai Baicheng Electric Equipment Manufacture switches, including power tool switch VS80B, power tool switch VS82, power tool switch VS72, and power tool switch VS70; and Omron switches, including S8VK-X, S8VK-S, S8FS-G, S8FS-C, S8VK-G, S8VK-C, S8VK-T, S8VK-R, S8VS, S8JX, S8VM, S8EX, S8EA, S8AS, S8TS, and S82
  • the terms “coupled, ” “connected, ” and the like, as used herein, mean the joining of two members directly or indirectly to one another. Such joining may be stationary (e.g., permanent) or moveable (e.g., removable, releasable, etc. ) . Such joining may be achieved with the two members or the two members and any additional intermediate members being integrally formed as a single unitary body with one another or with the two members or the two members and any additional intermediate members being attached to one another.
  • circuit may include hardware structured to execute the functions described herein.
  • each respective “circuit” may include machine-readable media for configuring the hardware to execute the functions described herein.
  • the circuit may be embodied as one or more circuitry components including, but not limited to, processing circuitry, network interfaces, peripheral devices, input devices, output devices, sensors, etc.
  • a circuit may take the form of one or more analog circuits, electronic circuits (e.g., integrated circuits (IC) , discrete circuits, system on a chip (SOCs) circuits, etc. ) , telecommunication circuits, hybrid circuits, and any other type of “circuit.
  • IC integrated circuits
  • SOCs system on a chip
  • a circuit may include any type of component for accomplishing or facilitating achievement of the operations described herein.
  • a circuit as described herein may include one or more transistors, logic gates (e.g., NAND, AND, NOR, OR, XOR, NOT, XNOR, etc. ) , resistors, multiplexers, registers, capacitors, inductors, diodes, wiring, and so on) .
  • the “circuit” may also include one or more processors communicably coupled to one or more memory or memory devices.
  • the one or more processors may execute instructions stored in the memory or may execute instructions otherwise accessible to the one or more processors.
  • the one or more processors may be embodied in various ways.
  • the one or more processors may be constructed in a manner sufficient to perform at least the operations described herein.
  • the one or more processors may be shared by multiple circuits (e.g., circuit A and circuit B may comprise or otherwise share the same processor which, in some example embodiments, may execute instructions stored, or otherwise accessed, via different areas of memory) .
  • the one or more processors may be structured to perform or otherwise execute certain operations independent of one or more co-processors.
  • two or more processors may be coupled via a bus to enable independent, parallel, pipelined, or multi-threaded instruction execution.
  • Each processor may be implemented as one or more general-purpose processors, application specific integrated circuits (ASICs) , field programmable gate arrays (FPGAs) , digital signal processors (DSPs) , or other suitable electronic data processing components structured to execute instructions provided by memory.
  • the one or more processors may take the form of a single core processor, multi-core processor (e.g., a dual core processor, triple core processor, quad core processor, etc. ) , microprocessor, etc.
  • the one or more processors may be external to the apparatus, for example the one or more processors may be a remote processor (e.g., a cloud based processor) .
  • the one or more processors may be internal and/or local to the apparatus.
  • a given circuit or components thereof may be disposed locally (e.g., as part of a local server, a local computing system, etc. ) or remotely (e.g., as part of a remote server such as a cloud based server) .
  • a “circuit” as described herein may include components that are distributed across one or more locations.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Harvester Elements (AREA)

Abstract

L'invention concerne un moteur à combustion interne (106) comprenant un bloc moteur (114) comprenant un cylindre (116), un piston (118) configuré pour effectuer un mouvement de va-et-vient à l'intérieur du cylindre (116), un vilebrequin (110) couplé au piston (118) et configuré pour tourner autour d'un axe de vilebrequin (111), une source d'alimentation (14) comprenant au moins deux bornes de sortie de tension (32, 38), un moteur de démarrage (16) configuré pour faire tourner le vilebrequin (110) et démarrer le moteur (106) lors de la réception de la puissance provenant de la source d'alimentation (14), et un composant de commutation d'outil électrique (12) configuré pour fournir sélectivement de l'énergie à partir de la source d'alimentation (14) au moteur de démarrage (16). Le composant (12) comprend un boîtier (20), une interface utilisateur (182), un ensemble carte de circuit imprimé (25) positionné à l'intérieur du boîtier (20), un premier ensemble de bornes (29) connecté électriquement à la source d'alimentation (14), et un second ensemble de bornes (27) électriquement connecté au moteur de démarrage (16). L'ensemble carte de circuit imprimé (25) comprend un ou plusieurs circuits (62, 64, 66, 68) ayant des instructions exécutables par machine configurées pour commander le fonctionnement du moteur de démarrage (16) et du composant de commutation d'outil électrique (12).
PCT/CN2018/105456 2018-09-13 2018-09-13 Moteur avec commutateur de démarreur intégré WO2020051829A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/105456 WO2020051829A1 (fr) 2018-09-13 2018-09-13 Moteur avec commutateur de démarreur intégré

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/105456 WO2020051829A1 (fr) 2018-09-13 2018-09-13 Moteur avec commutateur de démarreur intégré

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Citations (6)

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Publication number Priority date Publication date Assignee Title
US20080079264A1 (en) * 2006-09-29 2008-04-03 Serdynski David P Power-generating apparatus, such as a generator
CN104093952A (zh) * 2012-01-24 2014-10-08 日立工机株式会社 具有电启动器和反冲启动器的手持发动机动力工具
CN104582468A (zh) * 2012-04-17 2015-04-29 布里格斯斯特拉顿公司 用于发动机的启动系统
CN107002623A (zh) * 2014-12-04 2017-08-01 瑞美技术有限责任公司 具有控制继电器开关的起动机系统
CN106999993A (zh) * 2014-12-05 2017-08-01 布里格斯斯特拉顿公司 含有喷射泵的压力清洗机
CN108372486A (zh) * 2017-01-30 2018-08-07 安德烈·斯蒂尔股份两合公司 带有内燃机和电气起动装置的手引导式工作设备

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080079264A1 (en) * 2006-09-29 2008-04-03 Serdynski David P Power-generating apparatus, such as a generator
CN104093952A (zh) * 2012-01-24 2014-10-08 日立工机株式会社 具有电启动器和反冲启动器的手持发动机动力工具
CN104582468A (zh) * 2012-04-17 2015-04-29 布里格斯斯特拉顿公司 用于发动机的启动系统
CN107002623A (zh) * 2014-12-04 2017-08-01 瑞美技术有限责任公司 具有控制继电器开关的起动机系统
CN106999993A (zh) * 2014-12-05 2017-08-01 布里格斯斯特拉顿公司 含有喷射泵的压力清洗机
CN108372486A (zh) * 2017-01-30 2018-08-07 安德烈·斯蒂尔股份两合公司 带有内燃机和电气起动装置的手引导式工作设备

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