JPH10212981A - Fuel exhausting prevention device for gaseous fuel engine - Google Patents
Fuel exhausting prevention device for gaseous fuel engineInfo
- Publication number
- JPH10212981A JPH10212981A JP9015432A JP1543297A JPH10212981A JP H10212981 A JPH10212981 A JP H10212981A JP 9015432 A JP9015432 A JP 9015432A JP 1543297 A JP1543297 A JP 1543297A JP H10212981 A JPH10212981 A JP H10212981A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- engine
- gaseous
- gaseous fuel
- catalyst
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は気体燃料エンジンの
燃料排出防止装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel discharge prevention device for a gaseous fuel engine.
【０００２】[0002]
【従来の技術】従来、気体燃料エンジンに設けられた燃
料排出防止装置において、燃料遮断弁と燃料噴射弁とを
結ぶ燃料パイプから分岐して触媒部の上流側又は触媒部
の内部に気体燃料を導くバイパス通路を設け、エンジン
停止後に開弁する燃料弁をこのバイパス通路に設け、エ
ンジン停止直後の高温の触媒を利用して残存燃料を燃焼
しかつ清浄化する燃料排出防止装置が知られている。エ
ンジン停止時に残存燃料を活性状態にある触媒部の上流
側に導入することにより、残存燃料を燃焼しかつ清浄化
し、未燃残存燃料が吸気系及び大気へ放散することを防
止することができる。この種の燃料排出防止装置の例と
しては、例えば特開平８−１３５５１０号公報に記載さ
れたものがある。同公報の燃料排出防止装置は、燃料遮
断弁の下流側の残存燃料が燃料噴射弁から漏れ出て、吸
気系及び大気へ放散することを防止することができる。
又、燃料パイプ及びバイパス通路内から残存燃料を排除
するために、エンジン停止時にしばらくエンジンをラン
オンさせる必要がない。そのため、ドライバに対して違
和感や不安感をもたらさず、エンジンの取扱い、操作性
が向上する。2. Description of the Related Art Conventionally, in a fuel discharge prevention device provided in a gaseous fuel engine, gaseous fuel is branched from a fuel pipe connecting a fuel cutoff valve and a fuel injection valve to an upstream side of a catalyst portion or inside the catalyst portion. 2. Description of the Related Art There is known a fuel discharge prevention device in which a bypass passage is provided, a fuel valve that opens after the engine is stopped is provided in the bypass passage, and the remaining fuel is burned and purified using a high-temperature catalyst immediately after the engine is stopped. . By introducing the remaining fuel to the upstream side of the active catalyst section when the engine is stopped, the remaining fuel is burned and purified, and the unburned remaining fuel can be prevented from being released to the intake system and the atmosphere. An example of this type of fuel emission prevention device is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-135510. The fuel discharge prevention device disclosed in the publication can prevent the residual fuel downstream of the fuel cutoff valve from leaking from the fuel injection valve and dissipating to the intake system and the atmosphere.
Further, there is no need to run the engine for a while when the engine is stopped in order to remove the remaining fuel from the fuel pipe and the inside of the bypass passage. Therefore, the driver does not feel uncomfortable or uneasy, and the handling and operability of the engine are improved.
【０００３】[0003]
【発明が解決しようとする課題】ところが、上記公報の
燃料排出防止装置は、燃料パイプ及びバイパス通路内の
残存燃料を積極的に捕集又は排出させる手段を有さない
ため、気体燃料が燃料パイプ及びバイパス通路内に残留
している可能性があり、残存燃料が燃料噴射弁から漏れ
出て、吸気系及び大気へ放散するおそれが依然として存
在する。又、残存燃料を無駄に燃焼してしまい、残存燃
料を有効に利用していない。However, the fuel discharge prevention device disclosed in the above publication has no means for actively collecting or discharging the remaining fuel in the fuel pipe and the bypass passage. And there is still a possibility that the remaining fuel leaks from the fuel injection valve and diffuses into the intake system and the atmosphere. In addition, the remaining fuel is burned wastefully, and the remaining fuel is not used effectively.
【０００４】上記問題に鑑み、本発明は、エンジン停止
後に残存燃料が燃料噴射弁から漏れ出て、吸気系及び大
気へ放散することを確実に防止しつつ、残存燃料を有効
利用することを目的とする。本発明は、残存燃料の有効
利用として、冷間始動時の触媒暖機に残存燃料を使用す
ることを目的とする。更に本発明は、触媒暖機のため
に、残存燃料を確実に燃焼させることを目的とする。[0004] In view of the above problems, an object of the present invention is to effectively utilize residual fuel while reliably preventing the residual fuel from leaking from a fuel injection valve after the engine is stopped and dissipating to the intake system and the atmosphere. And An object of the present invention is to use the remaining fuel for warming up the catalyst at the time of a cold start as effective use of the remaining fuel. Still another object of the present invention is to reliably burn the remaining fuel for warming up the catalyst.
【０００５】[0005]
【課題を解決するための手段】請求項１に記載の発明に
よれば、気体燃料エンジンの燃料排出防止装置におい
て、燃料供給通路内に設けられた燃料遮断弁と燃料噴射
弁との間の前記燃料供給通路から分岐し、かつ排気系に
設けられた触媒部の上流側に通ずるバイパス通路と、該
バイパス通路内に設けられ、かつ前記燃料遮断弁の閉弁
後に前記燃料供給通路及び前記バイパス通路内の気体燃
料を貯留する気体燃料貯留部と、前記気体燃料貯留部に
貯留された気体燃料を、エンジン始動時に前記触媒部の
上流側まで供給する供給手段と、前記触媒部の上流側に
供給された気体燃料を点火する点火栓と、を具備するこ
とを特徴とする気体燃料エンジンの燃料排出防止装置が
提供される。According to the first aspect of the present invention, in the fuel discharge prevention device for a gaseous fuel engine, the fuel injection valve is provided between a fuel cutoff valve and a fuel injection valve provided in a fuel supply passage. A bypass passage branched from a fuel supply passage and communicating with an upstream side of a catalyst unit provided in an exhaust system; and a fuel supply passage and the bypass passage provided in the bypass passage and after closing the fuel cutoff valve. A gaseous fuel storage unit for storing gaseous fuel in the gas supply unit, a supply unit for supplying the gaseous fuel stored in the gaseous fuel storage unit to an upstream side of the catalyst unit at the time of engine start, and a supply unit to an upstream side of the catalyst unit. And a spark plug for igniting the gaseous fuel.
【０００６】請求項１に記載の気体燃料エンジンの燃料
排出防止装置は、気体燃料貯留部により燃料供給通路及
びバイパス通路内の残存燃料を積極的に捕集する。その
ため、燃料は燃料供給通路及びバイパス通路内に残留し
ない。その結果、残存燃料が燃料噴射弁から漏れ出て、
吸気系及び大気へ放散することを確実に防止することが
できる。更に、燃料遮断弁の閉弁後に気体燃料貯留部に
貯留された気体燃料を、エンジン始動時に触媒部の上流
側まで供給して点火する。そのため、残存燃料を触媒暖
機に有効利用することができる。According to the first aspect of the present invention, the fuel discharge prevention device for the gaseous fuel engine actively collects the remaining fuel in the fuel supply passage and the bypass passage by the gaseous fuel storage portion. Therefore, the fuel does not remain in the fuel supply passage and the bypass passage. As a result, residual fuel leaks out of the fuel injection valve,
Dissipation into the intake system and the atmosphere can be reliably prevented. Further, the gaseous fuel stored in the gaseous fuel storage unit after the fuel cutoff valve is closed is supplied to the upstream of the catalyst unit and ignited when the engine is started. Therefore, the remaining fuel can be effectively used for warming up the catalyst.
【０００７】請求項２に記載の発明によれば、前記触媒
部の上流側に新気を供給する新気供給装置を更に具備す
ることを特徴とする請求項１に記載の気体燃料エンジン
の燃料排出防止装置が提供される。According to the second aspect of the present invention, the fuel supply system for a gaseous fuel engine according to the first aspect, further comprising a fresh air supply device for supplying fresh air upstream of the catalyst section. An emission prevention device is provided.
【０００８】請求項２に記載の気体燃料エンジンの燃料
排出防止装置は、新気供給装置により、残存燃料の燃焼
に必要な新気を供給し、触媒暖機のために残存燃料を確
実に燃焼させることができる。According to a second aspect of the present invention, there is provided a fuel discharge prevention device for a gaseous fuel engine, wherein a fresh air supply device supplies fresh air required for combustion of the remaining fuel and reliably burns the remaining fuel for warming up the catalyst. Can be done.
【０００９】[0009]
【発明の実施の形態】以下、添付図面を用いて本発明の
実施形態について説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１０】図１は本発明の気体燃料エンジンの燃料排
出防止装置の一実施形態の燃料系統図である。図１にお
いて、１は電磁弁からなる燃料噴射弁、２はデリバリパ
イプ、３は燃料パイプ、４はレギュレータ、５は燃料遮
断弁である。６は車両後部に搭載されかつ高圧気体燃料
を充填したタンク、７は大気と連通しているフィルタ、
８はリード弁、９は活性炭等の吸着剤を収納する蓄圧タ
ンク、１０は逆火防止器である。１１は蓄圧タンク上流
側燃料弁、１２は蓄圧タンク下流側燃料弁、１３はノズ
ル、１４は触媒部である。１５は排気マニホルド、１６
は気体燃料エンジン、１７は点火栓、１８はバイパス
（パージ）通路である。１９は、ドライバがイグニッシ
ョンスイッチ（図示せず）をオンにするとエンジンの運
転制御を開始し、イグニッションスイッチをオフにする
とエンジンの運転を停止し、更に上述した各弁の開閉制
御を行うＥＣＵである。FIG. 1 is a fuel system diagram of an embodiment of a fuel discharge prevention device for a gaseous fuel engine according to the present invention. In FIG. 1, reference numeral 1 denotes a fuel injection valve composed of an electromagnetic valve, 2 denotes a delivery pipe, 3 denotes a fuel pipe, 4 denotes a regulator, and 5 denotes a fuel cutoff valve. 6 is a tank mounted on the rear of the vehicle and filled with high-pressure gaseous fuel, 7 is a filter communicating with the atmosphere,
Reference numeral 8 denotes a reed valve, 9 denotes a pressure accumulating tank for storing an adsorbent such as activated carbon, and 10 denotes a flashback preventer. Reference numeral 11 denotes a fuel tank upstream fuel valve, 12 denotes a fuel tank downstream fuel valve, 13 denotes a nozzle, and 14 denotes a catalyst unit. 15 is an exhaust manifold, 16
Is a gas fuel engine, 17 is a spark plug, and 18 is a bypass (purge) passage. Reference numeral 19 denotes an ECU that starts operation control of the engine when the driver turns on an ignition switch (not shown), stops operation of the engine when the ignition switch is turned off, and further controls the opening and closing of each valve described above. .
【００１１】気体燃料エンジン１６の運転中、タンク６
内の気体燃料は、開弁中の燃料遮断弁５、レギュレータ
４、燃料パイプ３、デリバリパイプ２を介して複数の燃
料噴射弁１まで供給される。燃料噴射弁１は、気体燃料
エンジン１６の吸気マニホルド内に設けられており、Ｅ
ＣＵ１９からの指令により、開弁時に気体燃料を吸気マ
ニホルド内に噴射供給し、閉弁時に気体燃料の噴射供給
を停止する。気体燃料は、気体燃料エンジン１６内で燃
焼され、触媒部１４において清浄化され、大気中に排出
される。気体燃料エンジン１６の運転中、蓄圧タンク上
流側燃料弁１１、蓄圧タンク下流側燃料弁１２、及びリ
ード弁８は閉弁しており、点火栓１７は点火を行わな
い。During operation of the gaseous fuel engine 16, the tank 6
The gaseous fuel inside is supplied to the plurality of fuel injection valves 1 via the fuel cutoff valve 5, the regulator 4, the fuel pipe 3, and the delivery pipe 2 which are being opened. The fuel injection valve 1 is provided in an intake manifold of the gaseous fuel engine 16,
In response to a command from the CU 19, gas fuel is injected and supplied into the intake manifold when the valve is opened, and injection supply of gas fuel is stopped when the valve is closed. The gaseous fuel is burned in the gaseous fuel engine 16, is purified in the catalyst unit 14, and is discharged to the atmosphere. During operation of the gaseous fuel engine 16, the fuel tank upstream fuel valve 11, the fuel tank downstream fuel valve 12, and the reed valve 8 are closed, and the ignition plug 17 does not ignite.
【００１２】走行終了後、ドライバがイグニッションス
イッチをオフに切り換え、気体燃料エンジン１６の運転
を停止すると、ＥＣＵ１９からの指令により、燃料遮断
弁５及び複数の燃料噴射弁１が閉弁する。蓄圧タンク上
流側燃料弁１１は開弁するが、蓄圧タンク下流側燃料弁
１２は閉弁したままである。燃料パイプ３及びデリバリ
パイプ２内の残存燃料は、蓄圧タンク上流側燃料弁１１
を介して蓄圧タンク９内に流入し、捕集される。気体燃
料エンジン１６の運転停止から所定時間経過後、蓄圧タ
ンク上流側燃料弁１１は閉弁する。この所定時間は、燃
料パイプ３及びデリバリパイプ２内の残存燃料が蓄圧タ
ンク９に捕集されるのに十分な時間として設定されてい
る。When the driver turns off the ignition switch after driving, and stops the operation of the gaseous fuel engine 16, the fuel cutoff valve 5 and the plurality of fuel injection valves 1 are closed by a command from the ECU 19. The fuel tank upstream-side fuel valve 11 is opened, but the fuel tank downstream-side fuel valve 12 is kept closed. The remaining fuel in the fuel pipe 3 and the delivery pipe 2 is stored in the fuel tank 11 on the upstream side of the accumulator tank.
Flows into the pressure accumulating tank 9 through the reservoir and is collected. After a lapse of a predetermined time from the stop of the operation of the gaseous fuel engine 16, the fuel valve 11 on the upstream side of the pressure accumulation tank is closed. This predetermined time is set as a time sufficient for the remaining fuel in the fuel pipe 3 and the delivery pipe 2 to be collected in the pressure accumulation tank 9.
【００１３】ドライバがイグニッションスイッチをオン
に切り換えて気体燃料エンジン１６を始動する際に、水
温が高い場合、触媒部１４の暖機は必要ない。そのた
め、気体燃料エンジン１６の停止後に蓄圧タンク９内に
捕集された気体燃料は、触媒部１４の暖機に使用されな
い。この場合、蓄圧タンク上流側燃料弁１１及び蓄圧タ
ンク下流側燃料弁１２は閉弁したままである。When the driver turns on the ignition switch to start the gaseous fuel engine 16, if the water temperature is high, the catalyst section 14 does not need to be warmed up. Therefore, the gaseous fuel collected in the accumulator tank 9 after the gaseous fuel engine 16 is stopped is not used for warming up the catalyst unit 14. In this case, the pressure accumulation tank upstream fuel valve 11 and the pressure accumulation tank downstream fuel valve 12 remain closed.
【００１４】ドライバがイグニッションスイッチをオン
に切り換えて気体燃料エンジン１６を始動する際に、水
温が低い場合、触媒部１４の暖機が必要である。そのた
め、気体燃料エンジン１６の停止後に蓄圧タンク９内に
捕集された気体燃料は、触媒部１４の暖機に使用され
る。この場合、ＥＣＵ１９からの指令により、まず蓄圧
タンク下流側燃料弁１２及びリード弁８が開弁する。そ
の結果、蓄えられていた気体燃料が蓄圧タンク９から流
出し、フィルタ７を介して流入する新気と混合し、逆火
防止器１０及びノズル１３を介して触媒部入口に流入す
る。続いて、点火栓１７は、触媒部入口に流入した気体
燃料を点火し、燃焼させる。その結果、触媒部１４の温
度が上昇し、触媒部１４は早期に暖機される。触媒部１
４の暖機に使用された気体燃料は、触媒部１４により清
浄化され、大気中に排出される。続いて、所定時間経過
後に蓄圧タンク下流側燃料弁１２及びリード弁８が閉弁
する。この所定時間は、蓄圧タンク９内の残存燃料が完
全に流出するのに十分な時間として設定されている。When the driver turns on the ignition switch to start the gaseous fuel engine 16 and the water temperature is low, the catalyst unit 14 needs to be warmed up. Therefore, the gaseous fuel collected in the pressure accumulating tank 9 after the stoppage of the gaseous fuel engine 16 is used for warming up the catalyst unit 14. In this case, in response to a command from the ECU 19, the fuel valve 12 and the reed valve 8 on the downstream side of the accumulator are first opened. As a result, the stored gaseous fuel flows out of the pressure storage tank 9, mixes with the fresh air flowing in through the filter 7, and flows into the catalyst section inlet through the flashback prevention device 10 and the nozzle 13. Subsequently, the ignition plug 17 ignites and burns the gaseous fuel flowing into the catalyst section inlet. As a result, the temperature of the catalyst unit 14 increases, and the catalyst unit 14 is warmed up early. Catalyst part 1
The gaseous fuel used for warming up in No. 4 is purified by the catalyst unit 14 and discharged into the atmosphere. Subsequently, after a lapse of a predetermined time, the fuel valve 12 and the reed valve 8 on the downstream side of the accumulation tank are closed. This predetermined time is set as a time sufficient for the residual fuel in the accumulator tank 9 to completely flow out.
【００１５】図２は、本実施形態の気体燃料エンジンの
燃料排出防止装置の制御フローチャートである。以下、
図２に基づいて、本実施形態の気体燃料エンジンの燃料
排出防止装置の制御について説明する。FIG. 2 is a control flowchart of the fuel discharge prevention device for the gaseous fuel engine according to the present embodiment. Less than,
The control of the fuel discharge prevention device for the gaseous fuel engine according to the present embodiment will be described based on FIG.
【００１６】燃料排出防止装置の制御は、車両にバッテ
リを接続すると開始する（ステップ１００）。まず、ド
ライバがエンジンのイグニッションスイッチをオフに切
り換えたかどうかの判断を行う（ステップ１０２）。こ
の判断がＹｅｓの場合、車両の走行終了後、ドライバが
気体燃料エンジン１６の運転を停止したと認定し、蓄圧
タンク上流側燃料弁１１を開弁する（ステップ１０
４）。続いて、所定時間経過後、蓄圧タンク上流側燃料
弁１１を閉弁し（ステップ１０６）、ステップ１１８に
移行する。The control of the fuel discharge prevention device starts when a battery is connected to the vehicle (step 100). First, it is determined whether or not the driver has turned off the ignition switch of the engine (step 102). If the determination is Yes, after the vehicle has finished traveling, it is determined that the driver has stopped the operation of the gaseous fuel engine 16 and the fuel valve 11 on the upstream side of the accumulator is opened (step 10).
4). Subsequently, after a lapse of a predetermined time, the fuel valve 11 on the upstream side of the pressure accumulation tank is closed (step 106), and the routine proceeds to step 118.
【００１７】ステップ１０２の判断がＮｏの場合、続い
てドライバがエンジンのエンジンのイグニッションスイ
ッチをオンに切り換えたかどうかの判断を行う（ステッ
プ１０８）。この判断がＮｏの場合、気体燃料エンジン
が運転中又は停止中であると認定し、ステップ１１８に
移行する。If the determination in step 102 is No, then it is determined whether the driver has turned on the ignition switch of the engine (step 108). If this determination is No, it is determined that the gaseous fuel engine is operating or stopped, and the process proceeds to step 118.
【００１８】ステップ１０８の判断がＹｅｓの場合、エ
ンジンが始動されると認定し、続いてエンジンの水温が
高いかどうかの判断を行う（ステップ１１０）。この判
断がＹｅｓの場合、触媒部１４（図１）の暖機は必要な
いと認定し、ステップ１１８に移行する。If the determination in step 108 is Yes, it is determined that the engine is started, and then it is determined whether the water temperature of the engine is high (step 110). If this determination is Yes, it is determined that the warm-up of the catalyst unit 14 (FIG. 1) is not necessary, and the process proceeds to step 118.
【００１９】ステップ１１０の判断がＮｏの場合、触媒
部１４を暖機する必要があると認定し、蓄圧タンク下流
側燃料弁１２及びリード弁８を開弁し（ステップ１１
２）、蓄圧タンク９内に蓄えられていた気体燃料と新気
とを混合して触媒部上流に流入させる。続いて、点火栓
１７を点火し（ステップ１１４）、触媒部上流に流入し
た気体燃料を燃焼させ、触媒部１４を暖機する。続い
て、所定時間経過後に蓄圧タンク上流側燃料弁１２及び
リード弁８を閉弁し（ステップ１１６）、ステップ１１
８に移行する。If the determination in step 110 is No, it is determined that the catalyst section 14 needs to be warmed up, and the fuel valve 12 and the reed valve 8 on the downstream side of the pressure accumulation tank are opened (step 11).
2) The gaseous fuel and fresh air stored in the pressure accumulating tank 9 are mixed and allowed to flow upstream of the catalyst section. Subsequently, the ignition plug 17 is ignited (step 114), and the gaseous fuel flowing upstream of the catalyst unit is burned to warm up the catalyst unit 14. Subsequently, after the elapse of a predetermined time, the fuel valve 12 and the reed valve 8 on the upstream side of the pressure accumulation tank are closed (step 116), and
Move to 8.
【００２０】ステップ１１８において、蓄圧タンク上流
側燃料弁１１が閉弁しているかどうかの判断を行う（ス
テップ１１８）。この判断がＹｅｓの場合にはステップ
１２２に移行し、Ｎｏの場合には、蓄圧タンク上流側燃
料弁１１を閉弁し（ステップ１２０）、ステップ１２２
に移行する。In step 118, it is determined whether the fuel tank 11 on the upstream side of the pressure accumulation tank is closed (step 118). If the determination is Yes, the process proceeds to step 122. If the determination is No, the pressure-accumulation-tank-upstream-side fuel valve 11 is closed (step 120).
Move to
【００２１】ステップ１２２において、蓄圧タンク下流
側燃料弁１２が閉弁しているかどうかの判断を行う（ス
テップ１２２）。この判断がＹｅｓの場合にはステップ
１２６に移行し、Ｎｏの場合には、蓄圧タンク下流側燃
料弁１２を閉弁し（ステップ１２４）、ステップ１２６
に移行する。In step 122, it is determined whether or not the fuel tank 12 on the downstream side of the pressure accumulation tank is closed (step 122). If the determination is Yes, the process proceeds to Step 126. If the determination is No, the pressure-accumulation tank downstream side fuel valve 12 is closed (Step 124), and Step 126 is performed.
Move to
【００２２】続いてステップ１００に戻り、上述した制
御を繰り返す。Subsequently, the flow returns to step 100, and the above-described control is repeated.
【００２３】[0023]
【発明の効果】請求項１に記載の発明によれば、エンジ
ン停止後に残存燃料が燃料噴射弁から漏れ出て、吸気系
及び大気へ放散することを確実に防止しつつ、残存燃料
を冷間始動時の触媒暖機に使用することができる。請求
項２に記載の発明によれば、触媒暖機のために、残存燃
料を確実に燃焼させることができる。According to the first aspect of the present invention, it is possible to prevent the residual fuel from leaking out of the fuel injection valve after the engine is stopped and dissipating the residual fuel to the intake system and the atmosphere, and to reduce the residual fuel in a cold state. It can be used to warm up the catalyst during startup. According to the second aspect of the present invention, the remaining fuel can be reliably burned for warming up the catalyst.
【図１】本発明の気体燃料エンジンの燃料排出防止装置
の一実施形態の燃料系統図である。FIG. 1 is a fuel system diagram of an embodiment of a fuel discharge prevention device for a gaseous fuel engine according to the present invention.
【図２】本実施形態の気体燃料エンジンの燃料排出防止
装置の制御フローチャートである。FIG. 2 is a control flowchart of the fuel discharge prevention device for the gaseous fuel engine according to the embodiment.
１…燃料噴射弁 ２…デリバリパイプ ３…燃料パイプ ５…燃料遮断弁 ９…蓄圧タンク １３…ノズル １４…触媒部 １６…気体燃料エンジン １７…点火栓 １８…バイパス通路 DESCRIPTION OF SYMBOLS 1 ... Fuel injection valve 2 ... Delivery pipe 3 ... Fuel pipe 5 ... Fuel cutoff valve 9 ... Pressure accumulation tank 13 ... Nozzle 14 ... Catalyst part 16 ... Gas fuel engine 17 ... Ignition plug 18 ... Bypass passage
Claims (2)
おいて、 燃料供給通路内に設けられた燃料遮断弁と燃料噴射弁と
の間の前記燃料供給通路から分岐し、かつ排気系に設け
られた触媒部の上流側に通ずるバイパス通路と、 該バイパス通路内に設けられ、かつ前記燃料遮断弁の閉
弁後に前記燃料供給通路及び前記バイパス通路内の気体
燃料を貯留する気体燃料貯留部と、 前記気体燃料貯留部に貯留された気体燃料を、エンジン
始動時に前記触媒部の上流側まで供給する供給手段と、 前記触媒部の上流側に供給された気体燃料を点火する点
火栓と、を具備することを特徴とする気体燃料エンジン
の燃料排出防止装置。1. A fuel discharge prevention device for a gaseous fuel engine, wherein a catalyst is provided in an exhaust system, the catalyst being branched from the fuel supply passage between a fuel cutoff valve and a fuel injection valve provided in a fuel supply passage. A bypass passage communicating with an upstream side of the fuel passage, a gas fuel storage portion provided in the bypass passage, and storing gaseous fuel in the fuel supply passage and the bypass passage after closing the fuel cutoff valve; Supply means for supplying the gaseous fuel stored in the fuel storage part to the upstream side of the catalyst part at the time of starting the engine; and an ignition plug for igniting the gaseous fuel supplied to the upstream side of the catalyst part. A fuel discharge prevention device for a gaseous fuel engine, characterized in that:
気供給装置を更に具備することを特徴とする請求項１に
記載の気体燃料エンジンの燃料排出防止装置。2. The fuel discharge prevention device for a gaseous fuel engine according to claim 1, further comprising a fresh air supply device for supplying fresh air to an upstream side of the catalyst section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9015432A JPH10212981A (en) | 1997-01-29 | 1997-01-29 | Fuel exhausting prevention device for gaseous fuel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9015432A JPH10212981A (en) | 1997-01-29 | 1997-01-29 | Fuel exhausting prevention device for gaseous fuel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10212981A true JPH10212981A (en) | 1998-08-11 |
Family
ID=11888640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9015432A Pending JPH10212981A (en) | 1997-01-29 | 1997-01-29 | Fuel exhausting prevention device for gaseous fuel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10212981A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030080892A (en) * | 2002-04-11 | 2003-10-17 | 씨멘스 오토모티브 주식회사 | A lp gas purging system on the fuel rail |
| KR100410822B1 (en) * | 2000-12-19 | 2003-12-18 | 기아자동차주식회사 | Initial stating system for LPG vehicle |
| KR100444384B1 (en) * | 2001-11-22 | 2004-08-16 | (주)모토닉 | gas fuel vehicles |
| KR100476196B1 (en) * | 2001-12-18 | 2005-03-16 | 현대자동차주식회사 | Method of protecting injector form leaking for lpi vehicles |
| KR100482934B1 (en) * | 2002-01-04 | 2005-04-14 | 최경호 | fuel recovery apparatus and method of gas fuel vehicles |
| KR100831316B1 (en) | 2007-05-16 | 2008-05-22 | 한국기계연구원 | Lpg gas feeding apparatus of gas fuel vehicles |
| JP2009281203A (en) * | 2008-05-20 | 2009-12-03 | Toyota Motor Corp | Gas circulation type engine |
| CN103306831A (en) * | 2012-03-07 | 2013-09-18 | 福特汽车澳洲公司 | Method and system for estimating fuel composition |
-
1997
- 1997-01-29 JP JP9015432A patent/JPH10212981A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100410822B1 (en) * | 2000-12-19 | 2003-12-18 | 기아자동차주식회사 | Initial stating system for LPG vehicle |
| KR100444384B1 (en) * | 2001-11-22 | 2004-08-16 | (주)모토닉 | gas fuel vehicles |
| KR100476196B1 (en) * | 2001-12-18 | 2005-03-16 | 현대자동차주식회사 | Method of protecting injector form leaking for lpi vehicles |
| KR100482934B1 (en) * | 2002-01-04 | 2005-04-14 | 최경호 | fuel recovery apparatus and method of gas fuel vehicles |
| KR20030080892A (en) * | 2002-04-11 | 2003-10-17 | 씨멘스 오토모티브 주식회사 | A lp gas purging system on the fuel rail |
| KR100831316B1 (en) | 2007-05-16 | 2008-05-22 | 한국기계연구원 | Lpg gas feeding apparatus of gas fuel vehicles |
| JP2009281203A (en) * | 2008-05-20 | 2009-12-03 | Toyota Motor Corp | Gas circulation type engine |
| US8453623B2 (en) | 2008-05-20 | 2013-06-04 | Toyota Jidosha Kabushiki Kaisha | Gas circulation engine |
| CN103306831A (en) * | 2012-03-07 | 2013-09-18 | 福特汽车澳洲公司 | Method and system for estimating fuel composition |
| CN103306831B (en) * | 2012-03-07 | 2017-03-01 | 福特汽车澳洲公司 | Estimate the method and system of fuel element |
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