WO2022138356A1 - オートチョーク装置 - Google Patents

オートチョーク装置 Download PDF

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Publication number
WO2022138356A1
WO2022138356A1 PCT/JP2021/046183 JP2021046183W WO2022138356A1 WO 2022138356 A1 WO2022138356 A1 WO 2022138356A1 JP 2021046183 W JP2021046183 W JP 2021046183W WO 2022138356 A1 WO2022138356 A1 WO 2022138356A1
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WO
WIPO (PCT)
Prior art keywords
opening degree
temperature
engine
relational information
outside air
Prior art date
Application number
PCT/JP2021/046183
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
明洋 石山
紘之 成田
健太朗 牧田
Original Assignee
三菱重工メイキエンジン株式会社
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 三菱重工メイキエンジン株式会社 filed Critical 三菱重工メイキエンジン株式会社
Priority to KR1020237003697A priority Critical patent/KR20230034348A/ko
Publication of WO2022138356A1 publication Critical patent/WO2022138356A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/02—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
    • F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat

Definitions

  • the present disclosure relates to an auto choke device for controlling the opening degree of a choke valve provided in an intake passage of an engine.
  • Patent Document 1 discloses an auto choke device that determines an opening degree of a choke valve based on temperature information representing an engine temperature at the time of starting an engine. As the engine temperature, the lubricating oil temperature, the cylinder head temperature, the cooling water temperature and the like are used.
  • the present disclosure aims to provide an auto choke device capable of reducing the risk of engine start failure.
  • the auto choke device is It is an auto choke device for controlling the opening degree of the choke valve provided in the intake passage of the engine.
  • An acquisition unit configured to acquire the engine temperature measured by the first temperature sensor and the outside air temperature measured by the second temperature sensor, and
  • An opening control unit configured to control the opening degree of the choke valve based on the outside air temperature or the comparison result between the outside air temperature and the engine temperature. To prepare for.
  • an auto choke device capable of reducing the risk of engine start failure.
  • expressions such as “same”, “equal”, and “homogeneous” that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
  • an expression representing a shape such as a square shape or a cylindrical shape not only represents a shape such as a square shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or a chamfering within a range where the same effect can be obtained. It shall also represent the shape including the part and the like.
  • the expressions “to have”, “to have”, “to include”, or "to have” one component are not exclusive expressions that exclude the existence of other components.
  • FIG. 1 is a schematic diagram illustrating an overall configuration of an engine 1 including an auto choke device 100 according to an embodiment.
  • the engine 1 may be an engine of a work machine such as a small farm tool, a mower, a rice transplanter, or a cultivator, or may be an engine of a vehicle.
  • the cylinder head of the engine 1 is provided with a spark plug 3 for igniting the engine 1, and an intake valve 4 and an exhaust valve 5 for adjusting the intake amount and the exhaust amount.
  • the engine 1 includes a first temperature sensor 2 for measuring the engine temperature and a second temperature sensor 10 for measuring the outside air temperature.
  • the first temperature sensor 2 is provided so as to measure the temperature of the ignition coil 13 as the engine temperature.
  • the engine temperature may be a representative temperature of the engine 1, a lubricating oil temperature, a cylinder head temperature, a spark plug 3 temperature, or the like.
  • a vaporizer (carburetor) 7 is connected to the intake pipe 6 provided with the intake valve 4.
  • the vaporizer 7 includes a throttle valve 8 arranged on the downstream side and a choke valve 9 arranged on the upstream side thereof. Air and fuel (not shown) are supplied to the vaporizer 7.
  • the choke valve 9 provided in the intake passage of the engine 1 is opened and closed by a stepping motor 11.
  • the engine 1 may be connected to a generator 12 configured to generate an alternating current by being driven by the engine 1.
  • a recoil starter (not shown) for manual starting may be connected to the crank shaft of the engine 1.
  • the auto choke device 100 is a device for controlling the opening degree of the choke valve 9 provided in the intake passage of the engine 1.
  • the auto choke device 100 drives the stepping motor 11 to control the opening degree of the choke valve 9 to adjust the amount of air flowing into the engine 1.
  • the auto choke device 100 controls the opening degree of the choke valve 9 based on the measured values of the engine temperature and the outside air temperature, and adjusts the inflow amount of air so that an appropriate air-fuel ratio can be obtained.
  • the auto choke device 100 includes, for example, a central processing unit (CPU) including a processor, a random access memory (RAM), a read-only memory (ROM), an I / O interface, and the like, and is configured as a microcomputer.
  • CPU central processing unit
  • RAM random access memory
  • ROM read-only memory
  • I / O interface I/ O interface
  • FIG. 2 is a block diagram schematically showing the configuration of the auto choke device 100 according to the embodiment.
  • the auto choke device 100 includes an acquisition unit 110 configured to acquire a temperature measurement value, an opening degree control unit 120 configured to control the opening degree of the choke valve 9, and an opening degree control unit 120 configured to control the opening degree of the choke valve 9.
  • a storage unit 130 for storing a plurality of relational information is provided.
  • the acquisition unit 110 acquires the engine temperature measured by the first temperature sensor 2 and the outside air temperature measured by the second temperature sensor 10.
  • the opening degree control unit 120 controls the opening degree of the choke valve 9 based on the engine temperature and the outside air temperature acquired by the acquisition unit 110 when the engine 1 is started.
  • the opening degree control unit 120 controls the opening degree of the choke valve 9 by controlling the number of input pulses to the stepping motor 11, for example.
  • the relationship information stored in the storage unit 130 is information indicating the relationship between the engine temperature and the opening degree of the choke valve 9.
  • the relationship information may be a map, a table, or a function.
  • the storage unit 130 may be a non-volatile memory such as a ROM or a flash memory included in the auto choke device 100, a volatile memory such as a RAM, or an external storage device connected to the auto choke device 100. good. Further, the storage unit 130 may store a program for executing the control process described later.
  • FIG. 3 is a diagram for explaining the relationship information used by the auto choke device 100 according to the embodiment.
  • the relationship information is information indicating the relationship between the engine temperature and the opening degree of the choke valve 9, as shown in FIG. 3, for example.
  • the engine temperature of the relevant information is the temperature of the ignition coil 13.
  • the storage unit 130 stores two types of relationship information including the first relationship information and the second relationship information.
  • the broken line 31 shows the first relational information
  • the solid line 32 shows the second relational information.
  • the second relational information is the relational information in which the opening degree of the choke valve 9 is larger when the engine temperature is the same as that of the first relational information.
  • the minimum opening degree of the choke valve 9 is the opening degree in the fully closed state (for example, the opening degree close to fully closed or within 10%). In the second related information, the minimum opening degree of the choke valve 9 is not the opening degree in the fully closed state.
  • the first-related information and the second-related information show a relationship in which the opening is small when the engine temperature is low and the opening is large when the engine temperature is high, and the relationship approaches full throttle.
  • the maximum opening degree in the first relational information and the second relational information may be the opening degree in the fully opened state.
  • the fully open state is, for example, an opening within a range of 90% to 100%, and means a state in which the opening is fully open or near fully open.
  • the opening in the fully open state may be interpreted as the maximum opening or the opening without choke operation.
  • the first-related information and / or the second-related information includes first temperature regions 31A and 32A in which the opening degree of the choke valve 9 is constant at the minimum opening degree with respect to a change in engine temperature.
  • FIG. 3 shows only two types of related information. However, three or more types of relationship information may be used. In a configuration using three or more types of relational information, the relational information may be used properly according to, for example, a state quantity such as an outside air temperature, an engine temperature, and a rotation speed.
  • a state quantity such as an outside air temperature, an engine temperature, and a rotation speed.
  • the opening degree control unit 120 selects one of a plurality of relational information based on the comparison result with the outside air temperature and the engine temperature acquired by the acquisition unit 110, and the choke valve 9 is based on the selected relational information.
  • the opening degree may be controlled. For example, when the engine temperature is not higher than the outside air temperature by the second reference value or more in the comparison result, the opening degree control unit 120 controls the opening degree of the choke valve 9 by using the first relational information. You may.
  • the second reference value is preferably set to a value within the range of 0.5 ° C. or higher and 5 ° C. or lower, and is, for example, 5 ° C.
  • the opening control unit 120 is the first. 2
  • the opening degree of the choke valve 9 may be controlled by using the related information.
  • the third reference value is preferably set to a value within the range of 40 ° C. or higher and 80 ° C. or lower, and is, for example, 60 ° C.
  • the relational information used by the auto choke device 100 may be one function, and the auto choke device 100 may appropriately change the coefficient included in the function. By changing the coefficient in this way, the auto choke device 100 may realize substantially the same function as the configuration using a plurality of relational information.
  • the opening degree control unit 120 is configured to control the opening degree of the choke valve 9 to a fully open state when the outside air temperature acquired by the acquisition unit 110 is equal to or higher than the first reference value.
  • the opening control unit 120 does not execute the choke operation regardless of the comparison result between the engine temperature and the outside air temperature, and the choke valve 9 is used.
  • the opening degree may be controlled to a normal opening degree (for example, fully open or maximum opening degree).
  • the first reference value is set to, for example, a high temperature (for example, 30 ° C.) among the air temperatures.
  • FIG. 4 is a flowchart showing an example of a process executed by the auto choke device 100 according to the embodiment.
  • This process is executed when the engine 1 is started.
  • the choke valve 9 is controlled so as to be in the opening state of the operating state, that is, in the fully open state, and the opening degree is controlled to the opening degree according to the temperature measurement value in the subsequent processing.
  • control using two types of relational information, the first relational information and the second relational information will be described, but the processing executed by the auto choke device 100 is not limited to such control.
  • the engine 1 may be started by a recoil starter (not shown).
  • the acquisition unit 110 of the auto choke device 100 acquires the measured values of the engine temperature Te and the outside air temperature To from the first temperature sensor 2 and the second temperature sensor 10 (step S1).
  • the auto choke device 100 determines whether or not the acquired outside air temperature To is equal to or higher than the first reference value (step S2).
  • step S3 When it is determined that the outside air temperature To is equal to or higher than the first reference value (step S2; Yes), the opening degree control unit 120 of the auto choke device 100 controls the opening degree of the choke valve 9 to the fully open state (step S3).
  • step S3 when it is determined that the outside air temperature To is not equal to or higher than the first reference value (step S2; No), the auto choke device 100 has a temperature at which the acquired engine temperature Te is higher than the second reference value by the second reference value or higher. It is determined whether or not (that is, Te ⁇ To + second reference value) (step S4).
  • step S4 When it is determined that the engine temperature Te is not higher than the outside air temperature To by the second reference value or more (step S4; No), the opening control unit 120 of the auto choke device 100 is based on the first relational information. The opening degree of the choke valve 9 is controlled (step S7). On the other hand, when it is determined that the engine temperature Te is higher than the outside air temperature To by the second reference value or more (step S4; Yes), the auto choke device 100 has the acquired engine temperature Te of the third reference value or more. (Step S5).
  • step S5 When it is determined that the engine temperature Te is not equal to or higher than the third reference value (step S5; No), the opening degree control unit 120 of the auto choke device 100 controls the opening degree of the choke valve 9 based on the first relational information (step S5; No). Step S7). On the other hand, when it is determined that the engine temperature Te is equal to or higher than the third reference value (step S5; Yes), the auto choke device 100 controls the opening degree of the choke valve 9 based on the second related information (step S6). After the start is successful in steps S3, 6 and 7, the opening degree control unit 120 increases the opening degree of the choke valve 9 and controls the opening degree to the normal operating state of the engine 1.
  • the present disclosure is not limited to the above-mentioned embodiment, and includes a form in which the above-mentioned embodiment is modified and a form in which a plurality of embodiments are appropriately combined.
  • the auto choke device (100) is An auto choke device (100) for controlling the opening degree of a choke valve (9) provided in an intake passage of an engine (1).
  • An acquisition unit (110) configured to acquire the engine temperature measured by the first temperature sensor (2) and the outside air temperature measured by the second temperature sensor (10).
  • An opening control unit (120) configured to control the opening degree of the choke valve (9) based on the outside air temperature or the comparison result between the outside air temperature and the engine temperature. To prepare for.
  • the opening degree of the choke valve (9) not only the engine temperature but also the outside air temperature is used to control the opening degree of the choke valve (9). Therefore, even if the engine temperature is low, if the outside air temperature is high, it is possible to control the opening degree of the choke valve (9) so as not to operate the choke operation. Further, by comparing the outside air temperature and the engine temperature, it is possible to set the opening degree of the choke valve (9) based on the presence or absence of the engine operation history. By controlling the opening degree of the choke valve (9) in this way, the risk of failure in starting the engine (1) can be reduced.
  • the opening degree control unit (120) is configured to control the opening degree to the fully open state.
  • the opening degree of the choke valve (9) is controlled by focusing only on the engine temperature as in Patent Document 1, at a low engine temperature such that the opening degree of the choke valve (9) is slightly closed.
  • the opening degree of the choke valve (9) is controlled to the fully open state. Therefore, it is possible to suppress the occurrence of fogging of the spark plug (3) and reduce the possibility that the engine (1) will fail to start.
  • a storage unit (130) for storing a plurality of relationship information indicating the relationship between the engine temperature and the opening degree is provided.
  • the opening degree control unit (120) selects one said relational information from the plurality of relational information based on the comparison result between the engine temperature and the outside air temperature, and the opening degree is based on the selected relational information. To control.
  • the choke valve (9) since the opening degree of the choke valve (9) is controlled by using the relational information according to the comparison result between the engine temperature and the outside air temperature, the choke valve (9) has an air-fuel ratio suitable for starting. It is possible to start by controlling the opening degree of 9).
  • the plurality of relational information includes the first relational information and the second relational information which is the relational information having a larger opening degree when the engine temperature is the same as that of the first relational information.
  • the opening degree of the choke valve (9) is controlled by properly using the first related information and the second related information according to the comparison result between the engine temperature and the outside air temperature. Therefore, the opening degree of the choke valve (9) can be easily controlled to an appropriate value.
  • the plurality of relational information includes the first relational information in which the minimum opening degree of the choke valve (9) is the opening degree in the fully closed state, and the minimum opening degree of the choke valve (9) is the opening degree in the fully closed state. Includes second relevant information that is not.
  • the first relational information is used when the air-fuel ratio is appropriate in the normal choke operation
  • the second relational information is used when the air-fuel ratio is not appropriate in the normal choke operation. Can be done. This makes it possible to suppress unnecessary choke operation, and for example, it is possible to suppress the occurrence of fogging of the spark plug (3).
  • the opening degree control unit (120) controls the opening degree by using the first relational information.
  • the opening degree of the choke valve (9) is increased by using the first related information. It is controlled to be relatively small. Therefore, even when the engine temperature is not high according to the operation history of the engine (1), it is possible to control the opening degree of the choke valve (9) to be appropriate.
  • the opening degree control unit (120) is when the engine temperature is higher than the outside air temperature by a second reference value or more, and the engine temperature is higher than the third reference value. Controls the opening degree using the second relational information.
  • the second relation when the engine temperature is higher than the outside air temperature by the second reference value or more and the engine temperature is higher than the third reference value according to the operation history of the engine (1), the second relation is made.
  • the information is used to control the opening degree of the choke valve (9) to be relatively large. Therefore, even when the temperature state is affected by the operation history of the engine (1), it is possible to control the opening degree of the choke valve (9) to be appropriate.
  • the first relational information and / or the second relational information A first temperature region in which the opening is constant at the lowest opening with respect to the change in engine temperature, and A second temperature region in which the opening is constant at the maximum opening with respect to the change in engine temperature, and A third temperature region in which the opening degree changes according to the engine temperature, including.
  • the engine temperature is the temperature of the ignition coil (13) for igniting the engine (1).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
PCT/JP2021/046183 2020-12-21 2021-12-15 オートチョーク装置 WO2022138356A1 (ja)

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KR1020237003697A KR20230034348A (ko) 2020-12-21 2021-12-15 오토 초크 장치

Applications Claiming Priority (2)

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JP2020211097A JP7496302B2 (ja) 2020-12-21 2020-12-21 オートチョーク装置
JP2020-211097 2020-12-21

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551472A (en) * 1979-01-11 1980-01-08 Yamaha Motor Co Ltd Choke valve control system
JPH04116256A (ja) * 1990-09-04 1992-04-16 Kubota Corp 電子ガバナー
JPH09280113A (ja) * 1996-04-10 1997-10-28 Mitsubishi Heavy Ind Ltd オートチョーク弁付気化器
JP2007032500A (ja) * 2005-07-29 2007-02-08 Komatsu Zenoah Co 携帯型作業機用エンジンのオートチョークおよびその制御方法
JP2009264268A (ja) * 2008-04-25 2009-11-12 Honda Motor Co Ltd 汎用内燃機関の制御装置
JP2013204533A (ja) * 2012-03-29 2013-10-07 Hitachi Koki Co Ltd エンジン作業機
JP2016118156A (ja) * 2014-12-20 2016-06-30 日立工機株式会社 エンジン作業機

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4199686B2 (ja) 2004-03-12 2008-12-17 本田技研工業株式会社 オートチョーク装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551472A (en) * 1979-01-11 1980-01-08 Yamaha Motor Co Ltd Choke valve control system
JPH04116256A (ja) * 1990-09-04 1992-04-16 Kubota Corp 電子ガバナー
JPH09280113A (ja) * 1996-04-10 1997-10-28 Mitsubishi Heavy Ind Ltd オートチョーク弁付気化器
JP2007032500A (ja) * 2005-07-29 2007-02-08 Komatsu Zenoah Co 携帯型作業機用エンジンのオートチョークおよびその制御方法
JP2009264268A (ja) * 2008-04-25 2009-11-12 Honda Motor Co Ltd 汎用内燃機関の制御装置
JP2013204533A (ja) * 2012-03-29 2013-10-07 Hitachi Koki Co Ltd エンジン作業機
JP2016118156A (ja) * 2014-12-20 2016-06-30 日立工機株式会社 エンジン作業機

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KR20230034348A (ko) 2023-03-09
JP7496302B2 (ja) 2024-06-06

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