JP2590397Y2 - Stop control device for CNG engine - Google Patents

Stop control device for CNG engine

Info

Publication number
JP2590397Y2
JP2590397Y2 JP1993004757U JP475793U JP2590397Y2 JP 2590397 Y2 JP2590397 Y2 JP 2590397Y2 JP 1993004757 U JP1993004757 U JP 1993004757U JP 475793 U JP475793 U JP 475793U JP 2590397 Y2 JP2590397 Y2 JP 2590397Y2
Authority
JP
Japan
Prior art keywords
engine
fuel
ignition
detecting
air
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.)
Expired - Lifetime
Application number
JP1993004757U
Other languages
Japanese (ja)
Other versions
JPH0663845U (en
Inventor
達司 宮田
育朗 野津
寛 高田
洋 松田
延雄 浜崎
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.)
UD Trucks Corp
Original Assignee
UD Trucks Corp
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 UD Trucks Corp filed Critical UD Trucks Corp
Priority to JP1993004757U priority Critical patent/JP2590397Y2/en
Publication of JPH0663845U publication Critical patent/JPH0663845U/en
Application granted granted Critical
Publication of JP2590397Y2 publication Critical patent/JP2590397Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Description

【考案の詳細な説明】[Detailed description of the invention]

【0001】[0001]

【産業上の利用分野】本考案は、CNGエンジンの停止
制御装置の改良に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a stop control device for a CNG engine.

【0002】[0002]

【従来の技術】天然ガスを燃料とするCNGエンジン
は、エンジンの運転状態を検出する手段と、エンジンの
吸気通路に供給される燃料を遮断する燃料遮断バルブを
備え、エンジンの運転停止指令時に点火信号の出力を停
止すると同時に、燃料遮断バルブを閉弁させて、吸気通
路に燃料を供給することを停止するようになっている
(実開平3−47453号公報、参照)。
2. Description of the Related Art A CNG engine using natural gas as a fuel is provided with a means for detecting an operating state of the engine and a fuel shutoff valve for shutting off fuel supplied to an intake passage of the engine. At the same time as the output of the signal is stopped, the fuel cutoff valve is closed to stop supplying fuel to the intake passage (see Japanese Utility Model Laid-Open No. 3-47453).

【0003】[0003]

【考案が解決しようとする課題】しかしながら、このよ
うな従来のCNGエンジンの停止制御装置にあっては、
運転停止指令時に燃料遮断バルブが閉弁された時点で、
吸気管やエンジン本体の吸気ポート等に多くの燃料が滞
留し、未燃焼燃料として大気に放出される可能性があっ
た。
However, in such a conventional CNG engine stop control device,
When the fuel shut-off valve is closed at the time of operation stop command,
A large amount of fuel may stay in an intake pipe or an intake port of an engine body, and may be released to the atmosphere as unburned fuel.

【0004】本考案は上記の問題点に着目し、CNGエ
ンジンの停止後に燃焼室に吸引された燃料が未燃焼のま
大気に放出されるのを防止することを目的とする。
[0004] The present invention focuses on the above problems, and the fuel sucked into the combustion chamber after the CNG engine is stopped remains unburned.
Also an object of the present invention can be prevented from being released into the atmosphere.

【0005】[0005]

【課題を解決するための手段】本考案は、図1に示すよ
うに、エンジンの運転状態を検出するエンジン運転状態
検出手段4と、検出された運転状態に基づいて点火を制
御する点火制御手段5と、点火装置7に点火信号を出力
する点火信号出力手段6と、エンジンの吸気通路に設け
たミキサーと燃料を貯溜するタンクを連結する通路の途
中に介装され、該通路を遮断する燃料遮断バルブ3と、
エンジンの運転停止指令時を検出するエンジン停止検出
手段1と、運転停止指令時に燃料遮断バルブ3を閉弁さ
せる燃料遮断手段2とを備えるCNGエンジンの停止制
御装置において、エンジンに供給される混合気の空燃比
排気ガスの酸素濃度から検出する空燃比検出手段9
と、運転停止指令時に検出される空燃比検出手段9によ
る空燃比が未燃焼燃料の大気放出を防止するために設定
した所定値よりリーン側に移行したことを検出して、点
火を停止させる信号を点火信号出力手段6に送る空燃比
比較手段10を備える。
According to the present invention, as shown in FIG. 1, an engine operating state detecting means 4 for detecting an operating state of an engine, and an ignition control means for controlling ignition based on the detected operating state. 5, an ignition signal output means 6 for outputting an ignition signal to an ignition device 7, and provided in an intake passage of the engine.
Application of the passage connecting the tank for reserving the mixer and fuel
A fuel shut-off valve 3 interposed therein to shut off the passage ;
In a CNG engine stop control device including an engine stop detecting means 1 for detecting a command to stop the operation of an engine and a fuel cutoff means 2 for closing a fuel cutoff valve 3 at the time of the stop command, a mixture supplied to the engine -Fuel ratio detecting means 9 for detecting the air-fuel ratio of the exhaust gas from the oxygen concentration of the exhaust gas
And the air-fuel ratio detected by the air-fuel ratio detecting means 9 detected at the time of the operation stop command is set to prevent unburned fuel from being released into the atmosphere.
An air-fuel ratio comparing means 10 for detecting a shift to the lean side from the predetermined value and sending a signal for stopping ignition to the ignition signal output means 6.

【0006】[0006]

【作用】運転停止指令時に燃料遮断バルブが閉弁された
後も、空燃比が未燃焼燃料の大気放出を防止するために
設定した所定値よりリーン側に移行するまでの間は点火
が行われることにより、吸気管等に滞留した燃料量に応
じてエンジンが運転され、吸気管等に滞留した燃料を充
分に燃焼させてから運転が停止されるため、未燃焼燃料
が大気に放出されることを防止できる。
The air-fuel ratio prevents the unburned fuel from being released to the atmosphere even after the fuel cutoff valve is closed at the time of the operation stop command.
The engine is operated in accordance with the amount of fuel accumulated in the intake pipe or the like by performing ignition until the fuel is shifted to the lean side from the set predetermined value, and the fuel accumulated in the intake pipe or the like is sufficiently burned. Since the operation is stopped from, the unburned fuel can be prevented from being released to the atmosphere.

【0007】[0007]

【実施例】図2は本発明の一実施例の機械的構成を示
す。図において、11は天然ガスを燃料とするCNGエ
ンジン本体、12は吸気通路、13は排気通路、14は
吸気弁、15は排気弁である
FIG . 2 shows a mechanical configuration of an embodiment of the present invention.
You. In the figure, reference numeral 11 denotes a CNG gas fueled by natural gas.
Engine body, 12 is an intake passage, 13 is an exhaust passage, 14 is
An intake valve 15 is an exhaust valve .

【0008】16は吸気通路12に燃料を吸入空気量に
応じて吸引させるミキサであり、1 7は吸気通路12に
燃料を噴射供給するソレノイド弁である
Reference numeral 16 designates the amount of fuel supplied to the intake passage 12
A mixer for sucking in accordance with
This is a solenoid valve that injects and supplies fuel .

【0009】タンク21に貯溜されたCNG燃料は、第
二燃料遮断バルブ20、レギュレータ19、第一燃料遮
断バルブ18を通ってミキサ16とソレノイド弁17に
導かれる。
The CNG fuel stored in the tank 21 is
Two fuel shutoff valve 20, regulator 19, first fuel shutoff
Through the disconnect valve 18 to the mixer 16 and the solenoid valve 17
Be guided.

【0010】22は点火栓、23はイグニッションコイ
ル、24はパワートランジスタであり、これらにより点
火装置が構成される
[0010] Reference numeral 22 denotes a spark plug, and 23 denotes an ignition coil.
And 24 are power transistors, which
A fire device is configured .

【0011】ソレノイド弁17から噴射される補助燃料
量を制御し、パワートランジスタ24に点火信号を出力
するとともに、第一遮断バルブ18および第二遮断バル
ブ20の開閉を制御するために、コントロールユニット
25が備えられる。コントロールユニット25はイグニ
ッションスイッチ32がONとなることにより運転制御
を開始し、イグニッションスイッチ32がOFFとなる
ことをエンジンの運転停止指令として入力する
Auxiliary fuel injected from solenoid valve 17
Control the amount and output the ignition signal to the power transistor 24
And the first shutoff valve 18 and the second shutoff valve
Control unit for controlling the opening and closing of the
25 are provided. The control unit 25 is
Operation control when the switch 32 is turned on.
Starts, and the ignition switch 32 is turned off.
Is input as an engine operation stop command .

【0012】コントロールユニット25は、図1に示し
た各手段2,5,6,9,10の機能を包含するもので
あり、上述したように、運転停止指令時に第一燃料遮断
バルブ18と第二燃料遮断バルブ20を閉弁させてか
ら、空燃比が未燃焼燃料の大気放出を防止するために設
定した所定値よりリーン側に移行するのに伴って点火信
号の出力を停止する。
The control unit 25 includes the functions of the means 2, 5, 6, 9, and 10 shown in FIG. 1. As described above, the first fuel cutoff valve 18 and the second (Ii) After the fuel cutoff valve 20 is closed, the air-fuel ratio is set to prevent unburned fuel from being released to the atmosphere.
The output of the ignition signal is stopped with the shift to the lean side from the predetermined value.

【0013】運転状態を検出する手段として、絞弁26
の開度を検出するスロットル開度センサ27、エンジン
回転数を検出する回転数センサ28、排気ガスの酸素濃
度からエンジンに供給される混合気の空燃比を検出する
空燃比センサ29、ノッキングの発生を検出するノッキ
ングセンサ30が設けられ、その信号がコントロールユ
ニット25に入力される
As means for detecting the operating state, a throttle valve 26 is provided.
Throttle opening sensor 27 for detecting the opening of the engine, the engine
A rotational speed sensor 28 for detecting the rotational speed, the oxygen concentration of the exhaust gas
The air-fuel ratio of the mixture supplied to the engine from the temperature
Air-fuel ratio sensor 29, knocking that detects occurrence of knocking
A sensor 30 is provided, and its signal is transmitted to the control unit.
It is input to the knit 25 .

【0014】図3は上記運転停止制御を行うための流れ
図で、一定周期で実行される
FIG . 3 is a flow chart for performing the operation stop control.
In the figure, it is executed at a constant cycle .

【0015】これについて説明すると、まずステップ1
では、エンジン停止指令信号として、イグニッションス
イッチ32がOFFになるかどうかを判定する
To explain this, first, step 1
Then, as the engine stop command signal,
It is determined whether the switch 32 is turned off .

【0016】イグニッションスイッチ32がOFFにな
ったらステップ2に進んで、第一燃料遮断バルブ18と
第二燃料遮断バルブ20を閉弁させるように出力する
When the ignition switch 32 is turned off,
Then, the process proceeds to step 2 and the first fuel cutoff valve 18 and
The output is such that the second fuel cutoff valve 20 is closed .

【0017】続いて、ステップ3に進んで空燃比ンサ2
9からの信号を入力して、ステップ4でエンジンに供給
される混合気の空燃比が所定値を越えてリーン化したと
判定されたら、ステップ5に進んで点火信号の出力を停
止する
Subsequently, the routine proceeds to step 3, where the air-fuel ratio sensor 2
Input the signal from 9 and supply it to the engine in step 4
The air-fuel ratio of the air-fuel mixture
If determined, proceed to step 5 to stop the output of the ignition signal.
Stop .

【0018】このようにして、運転停止指令時に燃料遮
断バルブが閉弁された後も、空燃比が所定値よりリーン
側に移行するまでの間は点火が行われることにより、吸
気通路12に滞留した燃料量に応じてエンジンが運転さ
れ、吸気通路12に滞留した燃料を十分に燃焼させてか
ら運転が停止されるため、未燃焼燃料が大気に放出され
ることを防止できる
In this way, when the operation stop command is issued, the fuel
Even after the shutoff valve is closed, the air-fuel ratio is leaner than the specified value.
The ignition is performed until it shifts to the
The engine is operated according to the amount of fuel accumulated in the air passage 12.
The fuel accumulated in the intake passage 12 is sufficiently burned.
Operation is stopped, and unburned fuel is released to the atmosphere.
Can be prevented .

【0019】[0019]

【考案の効果】本考案は、運転停止指令時に燃料遮断バ
ルブが閉弁された後も、空燃比が未燃焼燃料の大気放出
を防止するために設定した所定値よりリーン側に移行す
るまでの間は点火が行われる構成としたため、吸気管等
に滞留した燃料量に応じてエンジンが運転され、吸気管
等に滞留した燃料を十分に燃焼させてから運転が停止さ
れ、未燃焼燃料が大気に放出されることを防止できる。
[Effects of the Invention] In the present invention, the air-fuel ratio releases the unburned fuel to the atmosphere even after the fuel cutoff valve is closed at the time of the operation stop command.
The engine is operated in accordance with the amount of fuel accumulated in the intake pipe and the like, and the fuel accumulated in the intake pipe and the like is operated because the ignition is performed until the engine shifts to the lean side from a predetermined value set to prevent the engine. Is sufficiently burned, the operation is stopped, and unburned fuel can be prevented from being released to the atmosphere.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本考案のクレーム対応図FIG. 1 is a diagram corresponding to claims of the present invention .

【図2】同じく実施例を示す機械的構成図FIG. 2 is a mechanical configuration diagram showing the same embodiment .

【図3】同じく制御内容を示す流れ図FIG. 3 is a flowchart showing the same control contents .

【符号の説明】[Explanation of symbols]

1 エンジン停止検出手段 2 燃料遮断手段 3 燃料遮断バルブ 4 エンジン運転状態検出手段 5 停止制御手段 6 点火信号出力手段 7 点火装置 9 空燃比検出手段 10 空燃比比較手段 REFERENCE SIGNS LIST 1 engine stop detection means 2 fuel cutoff means 3 fuel cutoff valve 4 engine operation state detection means 5 stop control means 6 ignition signal output means 7 ignition device 9 air-fuel ratio detection means 10 air-fuel ratio comparison means

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 FI F02M 21/02 301 F02M 21/02 301K F02P 9/00 305 F02P 9/00 305A (72)考案者 松田 洋 埼玉県上尾市大字壱丁目一番地 日産デ ィーゼル工業株式会社内 (72)考案者 浜崎 延雄 埼玉県上尾市大字壱丁目一番地 日産デ ィーゼル工業株式会社内 (56)参考文献 特開 昭62−153569(JP,A) 特開 平4−153558(JP,A) 特開 昭63−219836(JP,A) 特開 昭62−168950(JP,A) 特開 昭54−109521(JP,A) 特開 平6−88542(JP,A) 特開 平6−10689(JP,A) 特開 平4−259651(JP,A) 特開 平5−321689(JP,A) 実開 昭60−19742(JP,U) 実開 平3−47453(JP,U) 実開 昭62−57764(JP,U) 実開 昭63−141861(JP,U) (58)調査した分野(Int.Cl.6,DB名) F02D 17/00 F02D 19/02 F02D 41/02 330 F02D 41/32 F02D 45/00 310 F02M 21/02 301 F02P 9/00 305────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. 6 Identification code FI F02M 21/02 301 F02M 21/02 301K F02P 9/00 305 F02P 9/00 305A (72) Inventor Hiroshi Matsuda Ageo City, Saitama Prefecture Ichi-Chome Ichibanchi Nissan Diesel Industry Co., Ltd. (72) Inventor Nobuo Hamasaki Ichi-Chome Ichicho Ichimechi, Ageo City, Saitama Prefecture (56) References JP-A-62-153569 (JP, A) JP-A-4-153558 (JP, A) JP-A-63-119836 (JP, A) JP-A-62-168950 (JP, A) JP-A-54-109521 (JP, A) JP-A-6-88542 (JP, A) JP-A-6-10689 (JP, A) JP-A-4-259561 (JP, A) JP-A-5-321689 (JP, A) JP-A-60-19742 (JP, U) Kaihei 3-47453 (JP , U) Japanese Utility Model Showa 62-57764 (JP, U) Japanese Utility Model Showa 63-141861 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) F02D 17/00 F02D 19/02 F02D 41/02 330 F02D 41/32 F02D 45/00 310 F02M 21/02 301 F02P 9/00 305

Claims (1)

(57)【実用新案登録請求の範囲】(57) [Scope of request for utility model registration] 【請求項1】エンジンの運転状態を検出するエンジン運
転状態検出手段と、検出された運転状態に基づいて点火
を制御する点火制御手段と、点火装置に点火信号を出力
する点火信号出力手段と、エンジンの吸気通路に設けた
ミキサーと燃料を貯溜するタンクを連結する通路の途中
に介装され、該通路を遮断する燃料遮断バルブと、エン
ジンの運転停止指令時を検出するエンジン停止検出手段
と、運転停止指令時に燃料遮断バルブを閉弁させる燃料
遮断手段とを備えるCNGエンジンの停止制御装置にお
いて、エンジンに供給される混合気の空燃比を排気ガス
の酸素濃度から検出する空燃比検出手段と、運転停止指
令時に検出される空燃比検出手段による空燃比が未燃焼
燃料の大気放出を防止するために設定した所定値よりリ
ーン側に移行したことを検出して、点火を停止させる信
号を点火信号出力手段に送る空燃比比較手段を備えたこ
とを特徴とするCNGエンジンの停止制御装置。
An engine operating state detecting means for detecting an operating state of the engine; an ignition controlling means for controlling ignition based on the detected operating state; an ignition signal output means for outputting an ignition signal to an ignition device; Installed in the intake passage of the engine
Middle of the passage connecting the tank for reserving the mixer and fuel
A CNG engine including a fuel cut-off valve interposed in the passage, an engine stop detecting means for detecting a command to stop the operation of the engine, and a fuel cut-off means for closing the fuel cut-off valve at the time of the stop command. exhaust gas in the stop control, the air-fuel ratio of the mixture supplied to the engine
And air-fuel ratio detecting means for detecting the oxygen concentration, the air-fuel ratio by the air-fuel ratio detection means is detected when the operation stop command unburned
CNG characterized by comprising air-fuel ratio comparing means for detecting a shift to a lean side from a predetermined value set for preventing fuel from being released to the atmosphere and sending a signal for stopping ignition to an ignition signal output means. Engine stop control device.
JP1993004757U 1993-02-16 1993-02-16 Stop control device for CNG engine Expired - Lifetime JP2590397Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1993004757U JP2590397Y2 (en) 1993-02-16 1993-02-16 Stop control device for CNG engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1993004757U JP2590397Y2 (en) 1993-02-16 1993-02-16 Stop control device for CNG engine

Publications (2)

Publication Number Publication Date
JPH0663845U JPH0663845U (en) 1994-09-09
JP2590397Y2 true JP2590397Y2 (en) 1999-02-10

Family

ID=11592772

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1993004757U Expired - Lifetime JP2590397Y2 (en) 1993-02-16 1993-02-16 Stop control device for CNG engine

Country Status (1)

Country Link
JP (1) JP2590397Y2 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4320790A (en) * 1979-03-07 1982-03-23 Dunlop Limited Tire treads
US4299264A (en) * 1979-04-12 1981-11-10 Dunlop Limited Tires
JPS5759102U (en) * 1980-09-25 1982-04-07
JPS57147901A (en) * 1981-03-10 1982-09-13 Yokohama Rubber Co Ltd:The Radial tire
JPS5940902A (en) * 1982-08-31 1984-03-06 Yokohama Rubber Co Ltd:The Pneumatic tire
JPS6019742U (en) * 1983-07-19 1985-02-09 株式会社小松製作所 Gas engine stop device
JPH0649441Y2 (en) * 1983-12-22 1994-12-14 住友ゴム工業株式会社 Low noise tires

Also Published As

Publication number Publication date
JPH0663845U (en) 1994-09-09

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