EP1041266A2 - Dispositif de commande du bypass du papillon - Google Patents

Dispositif de commande du bypass du papillon Download PDF

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Publication number
EP1041266A2
EP1041266A2 EP00106953A EP00106953A EP1041266A2 EP 1041266 A2 EP1041266 A2 EP 1041266A2 EP 00106953 A EP00106953 A EP 00106953A EP 00106953 A EP00106953 A EP 00106953A EP 1041266 A2 EP1041266 A2 EP 1041266A2
Authority
EP
European Patent Office
Prior art keywords
valve body
bypass
valve
engine
throttle
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP00106953A
Other languages
German (de)
English (en)
Other versions
EP1041266B1 (fr
EP1041266A3 (fr
Inventor
Kazuhito K.K. Honda Gijutsu Kenkyusho Hotta
Shunji K.K. Honda Gijutsu Kenkyusho Akamatsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of EP1041266A2 publication Critical patent/EP1041266A2/fr
Publication of EP1041266A3 publication Critical patent/EP1041266A3/fr
Application granted granted Critical
Publication of EP1041266B1 publication Critical patent/EP1041266B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F02M3/00—Idling devices for carburettors
    • F02M3/06—Increasing idling speed

Definitions

  • the present invention relates to a control unit for controlling a bypass in a throttle body, including: a throttle body having an intake passage communicated to an intake port of an engine; a bypass connected to the intake passage while bypassing a throttle valve for opening/closing the intake passage, the bypass being provided in the throttle body; and a first idle apparatus including a valve body for opening/closing the bypass and a thermosensitive actuating means actuated to move the valve body in the valve closing direction in accordance with the temperature rise of the engine, the first idle apparatus being mounted to the throttle body.
  • Such a control unit for controlling a bypass in a throttle body has been disclosed, for example, in Japanese Utility Model Laid-open No. Sho 59-167940.
  • a first idle apparatus provided in the above-described prior art control unit for controlling a bypass in a throttle body is operated to usually keep a valve body at a relatively high opening position and decrease, after start-up of the engine, the amount of intake air to be supplied to the engine via the bypass in accordance with the temperature rise of the engine, that is, in accordance with the progress of the warming operation of the engine, to thereby automatically adjust the first idling speed of the engine; and fully closing, after the warming operation of the engine, the valve body.
  • the first idle apparatus cannot adjust, after the warming operation, the usual idling speed of the engine.
  • first idle apparatus to adjust the idling speed of the engine, there have been known the following two configurations: (1) to screw, in the throttle body, an idle adjusting thread for adjusting the closed position of a throttle valve, thereby adjusting the amount of intake air passing through the throttle valve; and (2) to provide a second bypass, which is different from the bypass provided in the valve body of the first idle apparatus, in the throttle body and also provide, in the second bypass, an idle adjusting valve for adjusting the amount of intake air flowing in the second bypass.
  • the above configuration (1) is disadvantageous in that since the intake passage has a diameter larger than that of the bypass, in an extremely low opening degree region of the throttle valve, the amount of intake air is significantly changed even by slightly changing the opening degree of the throttle valve, so that some experience is required to finely adjust the amount of intake air for idling operation.
  • the configuration (2) has a merit of easily performing fine adjustment of the amount of intake air for idling operation because the fine adjustment is performed by the idle adjusting valve provided in the bypass having a diameter smaller than that of the intake passage; however, such a configuration has a disadvantage that since the two bypasses must be provided in the throttle body and further the idle adjusting valve is provided in addition to the first idle apparatus, the structure is complicated and the throttle body is enlarged.
  • an object of the present invention is to provide a control unit for controlling a bypass in a throttle body, which is capable of easily performing fine adjustment of the amount of intake air for idling operation by making use of a valve body provided in a first idle apparatus while simplifying the structure and making compact the throttle body.
  • a control unit for controlling a bypass in a throttle body including: a throttle body having an intake passage communicated to an intake port of an engine; a bypass connected to the intake passage while bypassing a throttle valve for opening/closing the intake passage, the bypass being provided in the throttle body; and a first idle apparatus including a valve body for opening/closing the bypass and a thermosensitive actuating means actuated to move the valve body in the valve closing direction in accordance with the temperature rise of the engine, the first idle apparatus being mounted to the throttle body; wherein a movable stopping means for adjusting a closed position of the valve body thereby adjusting an amount of intake air for idling of the engine is provided in the throttle body.
  • the closed position of the valve body of the first idle apparatus is specified by the movable stopping means. Accordingly, the amount of intake air for idling operation of the engine can be adjusted by adjusting the closed position of the valve body by means of operating the movable stopping means, to thereby obtain a desirable idling speed.
  • the amount of intake air for idling operation of the engine can be adjusted by adjusting the closed position of the valve body of the first idle apparatus as described above, it is possible to eliminate the need of provision of a bypass and an adjusting valve specialized for adjustment of idling operation, and hence to simplify the structure and make compact the throttle body.
  • the amount of intake air is adjusted in the bypass having a diameter smaller than that of the intake passage, it is possible to easily perform the fine adjustment of the amount of intake air.
  • valve body and the thermosensitive actuating means are connected to each other in such a manner as to be relatively moved within a specific stroke range along the movement direction of the valve body and the thermosensitive actuating means; and a lost motion spring for biasing the valve body in the valve closing direction is connected to the valve body.
  • a throttle body 3 is mounted, via an intake pipe 2, on one side surface of a cylinder head 1 of an engine E, and an air cleaner 5 is connected to an intake duct 4 connected to the upstream end of the throttle body 3.
  • the upstream side of an intake passage 6 of the throttle body 3 is communicated to the air cleaner 5 via the intake duct 4, and the downstream side of the intake passage 6 is communicated to an intake port 7 of the cylinder head 1 via the intake pipe 2.
  • a butterfly type throttle valve 8 for opening/closing the intake passage 6 is rotatably supported in the throttle body 3.
  • An electromagnetic type fuel injection valve 9 for injecting fuel to the downstream end of the intake port 7 is mounted to the intake pipe 2.
  • air filtered by the air cleaner 5 enters in the intake passage 6 through the intake duct 4, being controlled in its flow rate by the throttle valve 8, and is sucked in a combustion chamber 10 of the engine E via the intake port 7.
  • fuel in an amount corresponding to the operational state of the engine E is injected to the intake port 7 by the fuel injection valve 9, and is mixed with the above intake air in the combustion chamber 10, to form an air-fuel mixture.
  • a bypass 13 which bypasses the throttle valve 8 is provided in the throttle body 3. Both ends of the bypass 13 are connected to the intake passage 6.
  • a fast idle apparatus 15 having a piston type valve body 14 facing to the bypass 13 is mounted to the throttle body 3.
  • the throttle body 3 has a valve guide hole 16 in which the valve body 14 is slidably fitted, an inlet chamber 17 opened to an end surface of the valve guide hole 16, and an outlet chamber 18 communicated to one side surface of the valve guide hole 16 via a slit 19 extending in the sliding direction of the valve body 14.
  • the bypass 13 is composed of a bypass upstream portion 13a connected to the upstream side of the intake passage 6, and a bypass downstream portion 13b connected to the downstream side of the intake passage 6.
  • the downstream end of the bypass upstream portion 13a is connected to the inlet chamber 17, and the upstream end of the bypass downstream portion 13b is connected to the outlet chamber 18.
  • the opening degree of the slit 19 is adjusted by the side surface of the valve body 14, and the amount of intake air flowing in the bypass 13 is determined by the opening degree of the slit 19.
  • the first idle apparatus 15 is composed of the valve body 14 and a thermosensitive actuating means 20 actuated in accordance with the temperature rise of the engine E.
  • the thermosensitive actuating means 20 includes a housing 22 rigidly fitted in a mounting hole 21 of the throttle body 3; a wax holder 23 formed into a cylindrical shape with its one end closed and fitted in the housing 22; a wax case 25 in which wax 24 is enclosed and which is fitted in the wax holder 23; an output rod 28 slidably fitted in a bearing 25 provided at one end of the wax case 25, which rod has one end opposed to the wax 24 via a seal piston 27 and the other end projecting from the wax case 25; an operating member 29 formed into a cylindrical shape with its one end closed, which member is slidably fitted around the wax case 25 with its inner end surface being in contact with the tip of the output rod 28; a return spring 30 for biasing the operating member 29 on the output rod 28 side; and an electric heater 31 additionally provided on the wax holder 23.
  • the electric heater 31 is electrified after
  • a connecting shaft 34 extending coaxially with the output rod 28 is integrally formed on the outer end surface of the operating member 29.
  • a connecting hole 35 with its one end closed is formed in one end surface, opposite to the inlet chamber 17, of the valve body 14, and the connecting shaft 34 is slidably fitted in the connecting hole 35.
  • An outwardly spread flange 34a is formed at the tip of the connecting shaft 34, and an inwardly spread flange 35a is formed at the opening end of the connecting hole 35.
  • the sliding limit of the connecting shaft 34 and the valve body 14 in the extending direction is specified by the contact of the flanges 34a and 35a with each other.
  • a lost motion spring 36 for biasing the connecting shaft 34 and the valve body 14 in the extending direction, that is, biasing the valve body 14 in the valve closing direction is contracted between the connecting shaft 34 and the valve body 14.
  • the operating member 29 When the wax 24 contained in the wax case 25 is contracted in a cold environment, the operating member 29 is retreated by the biasing force of the return spring 30 in such a manner as to push the output rod 28 in the wax case 25.
  • the output rod 28 is actuated against the biasing force of the return spring 30 in such a manner as to move the operating member 29 forwardly on the valve body 14 side. Accordingly, the valve body 14 increases the opening degree of the slit 19 when the wax 24 is contracted, and decreases the opening degree of the slit 19 in accordance with the expansion of the wax 24.
  • a movable stopping means 37 for adjusting the closed position of the valve body 14 is provided to the throttle body 3.
  • the movable stopping means 37 is composed of a stopper bolt 38 and a coil spring 39.
  • the stopper bolt 38 is screwed in the throttle body 3 in such a manner that the tip thereof passes through the inlet chamber 17 and faces to the end surface of the valve body 14.
  • the coil spring 39 is held between the head of the stopper bolt 38 and the throttle body 3 for preventing irregular movement of the stopper bolt 38.
  • the operating member 29 Since the wax 24 is contracted in a cold environment, the operating member 29 is retreated by the biasing force of the return spring 30. In such a state, since the connecting shaft 34 of the operating member 29 and the valve body 14 are connected to each other in a state in which the outwardly spread flange 34a and the inwardly spread flange 35a are in contact with each other by the biasing force of the lost motion spring 36. As a result, the valve body 14 is kept, by the operating member 29, at a high opening position at which the slit 19 is largely opened as shown in Fig. 4.
  • the wax 24 is heated by the heater 31 and is expanded, to move the operating member 29 forwardly against the biasing force of the return spring 30.
  • the valve body 14 is thus pushed in the valve closing direction, to decrease the opening degree of the slit 19.
  • the amount of intake air passing through the bypass 13 is decreased, and the amount of fuel injected from the fuel injection valve 9 is correspondingly decreased, so that the first idling speed is reduced.
  • the valve body 14 When the valve body 14 reaches the position being in contact with the stopper bolt 38, that is, the closed position, the opening degree of the slit 19 is minimized and thereby the amount of intake air passing through the slit 19 is minimized.
  • the normal idling speed of the engine E can be ensured by the minimum amount of intake air. Accordingly, the closed position of the valve body 14 can be changed by adjusting the shift of the stopper bolt 30 to or from the valve body 14, to adjust the minimum amount of intake air, thereby adjusting the idling speed at a desired value.
  • the adjustment of the minimum intake air is performed by adjusting the opening degree of the slit 19 provided in the bypass 14 having a diameter very smaller than that of the intake passage 6, it is possible to easily perform fine adjustment of the minimum amount of intake air without the need of special experiences.
  • the valve body 14 of the first idle apparatus 15 serves as an idle adjusting valve for adjusting the amount of intake air for idling operation of the engine E, it is possible to eliminate the need of provision of a bypass and an adjusting valve specialized for adjustment of idling, and hence to simplify the structure and make compact the throttle body 3.
  • the connecting shaft 34 moved forwardly in the connecting hole 35 of the valve body 14 while compressing the lost motion spring 36, so that it is possible to avoid occurrence of excess stress by absorbing excess expansion of the wax 24 by the lost motion spring 36 while keeping the valve body 14 at a specific closed position. This means that even when the stopper bolt 38 is moved to or from the valve body 14 for adjusting the idling speed, the closed position of the valve body 14 can be easily, certainly adjusted irrespective of the expansion state of the wax 24.
  • the present invention is applied to the throttle body 3 of the fuel injection type engine E, and accordingly, the valve body 14 of the bypass 13 is configured to adjusts the flow rate of only air.
  • the air-fuel ratio can be freely adjusted by increasing/decreasing the flow rate of air flowing through the bypass 13 by the valve body 14 while keeping the amount of fuel injected from the fuel injection valve 9 at a specific value, and even when the injected amount of fuel is charged upon idling operation, the amount of air flowing through the bypass 13 can be adjusted by the valve body 14 in such a manner as to keep the air-fuel ratio at a specific value.
  • the present invention is not limited to the above embodiment, and it is to be understood that changes in design may be made without departing from the scope of the present invention.
  • the slit 19 may be replaced with a number of through-holes arranged in line or in a zigzag pattern.
  • a control unit for controlling a bypass in a throttle body including: a throttle body having an intake passage communicated to an intake port of an engine; a bypass connected to the intake passage while bypassing a throttle valve for opening/closing the intake passage, the bypass being provided in the throttle body; and a first idle apparatus including a valve body for opening/closing the bypass and a thermosensitive actuating means actuated to move the valve body in the valve closing direction in accordance with the temperature rise of the engine, the first idle apparatus being mounted to the throttle body; wherein a movable stopping means for adjusting a closed position of the valve body thereby adjusting an amount of intake air for idling of the engine is provided in the throttle body.
  • the amount of intake air for idling operation of the engine can be adjusted by adjusting the closed position of the valve body of the first idle apparatus, so that it is possible to eliminate the need of provision of a bypass and an adjusting valve specialized for adjustment of idling operation, and hence to simplify the structure and make compact the throttle body. Further, since the amount of intake air is adjusted in the bypass having a diameter smaller than that of the intake passage, it is possible to easily perform the fine adjustment of the amount of intake air.
  • the valve body and the thermosensitive actuating means are connected to each other in such a manner as to be relatively moved within a specific stroke range along the movement direction of the valve body and the thermosensitive actuating means; and a lost motion spring for biasing the valve body in the valve closing direction is connected to the valve body.
  • a bypass 13 connected to an intake passage 6 while bypassing a throttle valve 8 for opening/closing the intake passage 6 is provided in a throttle body 3.
  • a first idle apparatus 15 including a valve body 14 for opening/closing the bypass 13 and a thermosensitive actuating means 20 actuated to move the valve body 14 in the valve closing direction in accordance with the temperature rise of an engine E is mounted to the throttle body 3.
  • a movable stopping means 37 for adjusting a closed position of the valve body 14 thereby adjusting an amount of intake air for idling of the engine E is provided in the throttle body 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
EP20000106953 1999-03-31 2000-03-31 Dispositif de commande du bypass du papillon Expired - Lifetime EP1041266B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9265599 1999-03-31
JP09265599A JP4109788B2 (ja) 1999-03-31 1999-03-31 スロットルボディにおけるバイパス路制御装置

Publications (3)

Publication Number Publication Date
EP1041266A2 true EP1041266A2 (fr) 2000-10-04
EP1041266A3 EP1041266A3 (fr) 2001-02-07
EP1041266B1 EP1041266B1 (fr) 2004-12-08

Family

ID=14060496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000106953 Expired - Lifetime EP1041266B1 (fr) 1999-03-31 2000-03-31 Dispositif de commande du bypass du papillon

Country Status (7)

Country Link
EP (1) EP1041266B1 (fr)
JP (1) JP4109788B2 (fr)
CN (1) CN1109188C (fr)
DE (1) DE60016491T2 (fr)
ES (1) ES2234471T3 (fr)
ID (1) ID25439A (fr)
TW (1) TW432164B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1387075A1 (fr) * 2002-07-30 2004-02-04 Keihin Corporation Systeme de regulation d'un flux d'air d'admission pendant la procédure de démarrage d'un moteur
EP1760302A3 (fr) * 2005-08-23 2010-08-04 Keihin Corporation Soupape de derivation d'air dans une valve papillon

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4065115B2 (ja) * 2001-08-31 2008-03-19 株式会社ケーヒン エンジンの吸気量制御装置
BRPI1012241B1 (pt) * 2009-03-23 2020-09-15 Keihin Corporation Dispositivo de controle de entrada de ar para motor
JP6651594B1 (ja) * 2018-10-24 2020-02-19 株式会社ケーヒン 吸気制御装置
JP7266549B2 (ja) * 2020-03-27 2023-04-28 日立Astemo株式会社 吸気制御装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59167940U (ja) 1983-04-27 1984-11-10 本田技研工業株式会社 燃料噴射式エンジン用フア−ストアイドル装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1306901A (en) * 1970-05-25 1973-02-14 Gen Motors Corp Internal combustion engine idle speed controllers
JPS58148246A (ja) * 1982-02-26 1983-09-03 Hitachi Ltd 内燃機関用燃料供給装置
JPH06622Y2 (ja) * 1986-12-26 1994-01-05 三菱電機株式会社 機関の補助空気制御弁
KR910001056Y1 (ko) * 1987-02-26 1991-02-21 미쯔비시 덴끼 가부시끼가이샤 기관의 흡기량 제어장치
JP2751323B2 (ja) * 1989-02-21 1998-05-18 スズキ株式会社 内燃機関のアイドル回転数制御装置
JPH08338269A (ja) * 1995-06-14 1996-12-24 Hitachi Ltd 空気流量計一体型スロットルボディ

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59167940U (ja) 1983-04-27 1984-11-10 本田技研工業株式会社 燃料噴射式エンジン用フア−ストアイドル装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1387075A1 (fr) * 2002-07-30 2004-02-04 Keihin Corporation Systeme de regulation d'un flux d'air d'admission pendant la procédure de démarrage d'un moteur
US6901919B2 (en) 2002-07-30 2005-06-07 Keihin Corporation System for controlling flow of intake air during start-up period of engine
EP1760302A3 (fr) * 2005-08-23 2010-08-04 Keihin Corporation Soupape de derivation d'air dans une valve papillon

Also Published As

Publication number Publication date
EP1041266B1 (fr) 2004-12-08
EP1041266A3 (fr) 2001-02-07
TW432164B (en) 2001-05-01
ES2234471T3 (es) 2005-07-01
JP2000283009A (ja) 2000-10-10
ID25439A (id) 2000-10-05
DE60016491T2 (de) 2005-12-15
DE60016491D1 (de) 2005-01-13
CN1109188C (zh) 2003-05-21
CN1268622A (zh) 2000-10-04
JP4109788B2 (ja) 2008-07-02

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