JPH05256212A - Gas fuel supply device for engine - Google Patents
Gas fuel supply device for engineInfo
- Publication number
- JPH05256212A JPH05256212A JP4088002A JP8800292A JPH05256212A JP H05256212 A JPH05256212 A JP H05256212A JP 4088002 A JP4088002 A JP 4088002A JP 8800292 A JP8800292 A JP 8800292A JP H05256212 A JPH05256212 A JP H05256212A
- Authority
- JP
- Japan
- Prior art keywords
- engine
- valve
- temperature
- bypass passage
- fuel supply
- 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.)
- Withdrawn
Links
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はエンジンの低温始動およ
び暖機運転を円滑に行なわせる機能を具えた気体燃料供
給装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gaseous fuel supply system having a function of smoothly performing a cold start and a warm-up operation of an engine.
【0002】[0002]
【従来の技術】気体燃料、一般にはLPGを供給する装
置、即ち吸気系に設置されてLPGと空気とを混合する
混合器には、LPGを吸気路に送出するノズルとエンジ
ン出力制御用の絞り弁とのほかに、アイドル速度調整用
のバイパス通路が絞り弁の上流側と下流側とを接続させ
て設けられている(実公昭57−57252号公報参
照)。2. Description of the Related Art A device for supplying gaseous fuel, generally LPG, that is, a mixer installed in an intake system for mixing LPG and air has a nozzle for delivering LPG to an intake passage and a throttle for controlling engine output. In addition to the valve, a bypass passage for adjusting the idle speed is provided by connecting the upstream side and the downstream side of the throttle valve (see Japanese Utility Model Publication No. 57-57252).
【0003】このような気体燃料供給装置において、低
温時にエンジンを始動し暖機運転を行なう場合、ガソリ
ンエンジン用気化器の自動チョーク装置や燃料噴射装置
の低温用噴射弁を具えていないので、絞り弁を運転者が
手動で操作して開かせることによって混合気を増量させ
るようにしている。従って、運転者の個人差による開度
差や錯覚による早期閉弁を避けることができず、始動不
良や回転の不調度には停止などの不都合を招きやすい。In such a gaseous fuel supply device, when the engine is started and warmed up at a low temperature, an automatic choke device of a carburetor for a gasoline engine and a low temperature injection valve of a fuel injection device are not provided. The air-fuel mixture is increased by allowing the driver to manually open the valve to open it. Therefore, it is impossible to avoid the opening difference due to the individual difference of the driver and the early closing of the valve due to the illusion, and it is easy to cause inconvenience such as stop due to a poor starting or an irregular rotation.
【0004】一方、バイパス通路に電磁弁を設けて低温
時に絞り弁上流側と下流側とを連通させ増量混合気をエ
ンジンに供給する技術が実開昭54−87320号に開
示されているが、このものは電磁弁を設定温度以下で開
弁し設定温度以上で閉弁する構成であるので設定温度を
境に混合気供給量が急変し回転の不調や停止を招きやす
い。On the other hand, a technique for providing an engine with an increased air-fuel mixture by providing an electromagnetic valve in the bypass passage to connect the upstream side and the downstream side of the throttle valve at low temperature is disclosed in Japanese Utility Model Publication No. 54-87320. Since this type has a structure in which the solenoid valve is opened below the set temperature and closed above the set temperature, the supply amount of the air-fuel mixture suddenly changes at the set temperature, and the rotation is likely to malfunction or stop.
【0005】[0005]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、従来の気体燃料供給装置においては低温時
に温度に応じた適正量の増量混合気を供給し、低温始動
を確実に行なわせるとともに暖機運転を安定よく行なわ
せるのが困難であった、という点である。SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide an appropriate amount of the increased air-fuel mixture according to the temperature at a low temperature in the conventional gas fuel supply device to surely perform the cold start. At the same time, it was difficult to make the warm-up operation stable.
【0006】[0006]
【課題を解決するための手段】前記課題を解決するた
め、本発明は吸気路に絞り弁の上流側と下流側とを接続
して設けた増量混合気供給用のバイパス通路に開閉弁を
設置し、エンジン温度に応じて膨張収縮する流動物質で
前記開閉弁を駆動させることとし、これによって低温時
に温度に応じた適正量の増量混合気を供給する、という
目的を達成した。In order to solve the above-mentioned problems, the present invention installs an opening / closing valve in a bypass passage for supplying an increased mixture, which is provided by connecting an upstream side and a downstream side of a throttle valve in an intake passage. Then, the on-off valve is driven by a fluid substance that expands and contracts according to the engine temperature, thereby achieving the purpose of supplying an appropriate amount of the increased air-fuel mixture according to the temperature when the temperature is low.
【0007】[0007]
【作用】エンジンの低温時に流動物質は収縮しており開
閉弁を全開とするためバイパス通路により大量の増量混
合気が供給される。温度上昇に伴って流動物質が膨張し
開閉弁を次第に閉弁させると増量混合気が次第に減少
し、暖機完了時に全閉して増量混合気の供給を停止する
こととなる。When the engine temperature is low, the fluid substance is contracted and the on-off valve is fully opened, so that a large amount of the increased air-fuel mixture is supplied by the bypass passage. When the fluid substance expands with the rise in temperature and the on-off valve is gradually closed, the increased air-fuel mixture gradually decreases, and when the warm-up is completed, the air-fuel mixture is completely closed and the supply of the air-fuel mixture increase is stopped.
【0008】[0008]
【実施例】本発明をLPG混合器の絞り弁側方に設けた
バイパス通路に実施した例を図面に基いて説明すると、
図示しないベーパライザで減圧気化したLPGは供給通
路4を通って胴体1の吸気路2に設けられたベンチュリ
3を囲む環状の室5に入り、ノズル6からベンチュリ3
の最狭部に送出され空気と混合して図示しないエンジン
に供給される。DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the present invention is applied to a bypass passage provided on the side of a throttle valve of an LPG mixer will be described with reference to the drawings.
The LPG depressurized and vaporized by a vaporizer (not shown) passes through the supply passage 4 and enters the annular chamber 5 surrounding the venturi 3 provided in the intake passage 2 of the body 1, and then from the nozzle 6 to the venturi 3
Is sent to the narrowest part of the engine and mixed with air to be supplied to an engine (not shown).
【0009】吸気路2のベンチュリ3よりも下流であっ
て絞り弁7の上流側と絞り弁7の下流側とを接続してバ
イパス通路8が設けられており、このバイパス通路8を
横断するピストン状の開閉弁9が直線往復動可能に胴体
1に嵌装支持されている。A bypass passage 8 is provided downstream of the venturi 3 in the intake passage 2 and connecting the upstream side of the throttle valve 7 and the downstream side of the throttle valve 7, and a piston that crosses the bypass passage 8 is provided. The open-close valve 9 is fitted and supported on the body 1 so as to be linearly reciprocally movable.
【0010】一方、温度に応じて膨張収縮する流動物質
10は一般にサーモワックスであり、ケーシング11に
充填されてその開放端を覆った弾性カバー12を介して
ピストン13に戻しばね14と協働して直線往復動させ
るようになっており、ケーシング11はエンジン冷却水
15に浸漬されている。On the other hand, the fluid substance 10 which expands and contracts depending on the temperature is generally thermowax, and cooperates with the return spring 14 to the piston 13 through the elastic cover 12 which is filled in the casing 11 and covers the open end thereof. The casing 11 is immersed in the engine cooling water 15.
【0011】図1の実施例はピストン13の先端に開閉
弁9を直接結合したものであり、図2の実施例はピスト
ン13の先端と開閉弁9の基端に揺動レバー16の両端
を回動自由に係合し流動物質10の膨張収縮を拡大して
開閉弁9に伝えるようにしたものである。In the embodiment shown in FIG. 1, the opening / closing valve 9 is directly connected to the tip of the piston 13, and in the embodiment shown in FIG. 2, both ends of the rocking lever 16 are provided at the tip of the piston 13 and the base end of the opening / closing valve 9. The fluid material 10 is rotatably engaged and expands and contracts the fluid substance 10 to be transmitted to the on-off valve 9.
【0012】エンジン冷却水15の温度が低いとき、流
動物質10は収縮しており戻しばね14のばね力でピス
トン13が後退することによって開閉弁9は全開とさ
れ、バイパス通路8より大量の増量混合気をエンジンに
供給させる。温度が高くなって流動物質10が膨張しピ
ストン13を前進させると開閉弁9が次第に閉弁して増
量混合気の供給量を次第に減少させ、暖機完了時に開閉
弁9を閉弁状態としバイパス通路8を閉止する。When the temperature of the engine cooling water 15 is low, the fluid material 10 is contracted and the piston 13 is retracted by the spring force of the return spring 14, so that the on-off valve 9 is fully opened and a large amount of increase is made from the bypass passage 8. The mixture is supplied to the engine. When the temperature rises and the fluid substance 10 expands to move the piston 13 forward, the on-off valve 9 gradually closes to gradually reduce the supply amount of the increased air-fuel mixture, and when the warm-up is completed, the on-off valve 9 is closed and bypassed. The passage 8 is closed.
【0013】以上の実施例はLPG混合気にバイパス通
路8が設けられている場合であるが、胴体1とは別体の
スロットルボディにバイパス通路が設けられている場合
も全く同じであることは言うまでもない。In the above embodiment, the bypass passage 8 is provided in the LPG mixture, but the same is true when the bypass passage is provided in the throttle body which is separate from the body 1. Needless to say.
【0014】[0014]
【発明の効果】本発明によると、絞り弁のバイパス通路
に設けた開閉弁を温度に応じて膨張収縮する流動物質に
よって駆動する構成であるから運転者の個人差や錯覚に
よる増量混合気の過不足を招いたり開閉弁を全開・全閉
の二位置に固定することによる混合気流量の急変を招く
ことなく、温度に応じた適正量の増量混合気をエンジン
に供給して低温始動を確実に行なわせるとともに暖機運
転を安定よく行なわせることができるものである。According to the present invention, the on-off valve provided in the bypass passage of the throttle valve is driven by the fluid material that expands and contracts according to the temperature. Supply a proper amount of air-fuel mixture according to the temperature to the engine without causing a shortage or sudden change in the air-fuel mixture flow rate by fixing the open / close valve to the fully open / fully closed position to ensure a low temperature start. In addition to being able to perform the warm-up operation, the warm-up operation can be stably performed.
【図1】本発明の実施例を示す縦断面概略図である。FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention.
【図2】本発明の異なる実施例を示す縦断面概略図であ
る。FIG. 2 is a schematic vertical sectional view showing a different embodiment of the present invention.
【符号の説明】 2 吸気路 7 絞り弁 8 バイパス通路 9 開閉弁 10 流動物質[Explanation of symbols] 2 Intake passage 7 Throttle valve 8 Bypass passage 9 Open / close valve 10 Flowing substance
Claims (1)
続した増量混合気供給用のバイパス通路が設けられてい
るエンジン用気体燃料供給装置において、エンジン温度
に応じて膨張収縮する流動物質で駆動される開閉弁が前
記バイパス通路に設置されていることを特徴とするエン
ジン用気体燃料供給装置。1. A gas fuel supply system for an engine, wherein an intake passage is provided with a bypass passage for connecting an upstream side and a downstream side of a throttle valve for supplying an increased mixture, and a flow that expands and contracts in accordance with an engine temperature. A gaseous fuel supply system for an engine, wherein an on-off valve driven by a substance is installed in the bypass passage.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4088002A JPH05256212A (en) | 1992-03-12 | 1992-03-12 | Gas fuel supply device for engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4088002A JPH05256212A (en) | 1992-03-12 | 1992-03-12 | Gas fuel supply device for engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05256212A true JPH05256212A (en) | 1993-10-05 |
Family
ID=13930579
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4088002A Withdrawn JPH05256212A (en) | 1992-03-12 | 1992-03-12 | Gas fuel supply device for engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05256212A (en) |
-
1992
- 1992-03-12 JP JP4088002A patent/JPH05256212A/en not_active Withdrawn
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990518 |