JPH04370339A - Injection control device for fuel injection two-cycle engine - Google Patents
Injection control device for fuel injection two-cycle engineInfo
- Publication number
- JPH04370339A JPH04370339A JP17329591A JP17329591A JPH04370339A JP H04370339 A JPH04370339 A JP H04370339A JP 17329591 A JP17329591 A JP 17329591A JP 17329591 A JP17329591 A JP 17329591A JP H04370339 A JPH04370339 A JP H04370339A
- Authority
- JP
- Japan
- Prior art keywords
- temperature sensor
- exhaust chamber
- fuel injection
- sensor
- injection
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 37
- 239000007924 injection Substances 0.000 title claims abstract description 37
- 239000000446 fuel Substances 0.000 title claims abstract description 25
- 239000000498 cooling water Substances 0.000 claims abstract description 7
- 230000007423 decrease Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、スノーモービルなど
に用いる燃料噴射二サイクルエンジンの噴射制御装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection control device for a fuel injection two-stroke engine used in snowmobiles and the like.
【０００２】0002
【従来の技術】スノーモービルなどの動力には、二サイ
クルエンジンが用いられることが多い。そして最近では
、気化器に代えて燃料噴射弁で燃料を噴射するものがあ
る。この場合、図２に示すように、クランク回転センサ
ーＡと、スロットルバルブの開度を示すスロットル開度
センサーＢの入力を基準にして、吸気温センサーＣと冷
却水温センサーＤの入力で、燃料噴射弁の噴射時間を補
正して、噴射時間長さを決めるようにしている。2. Description of the Related Art Two-cycle engines are often used to power snowmobiles and the like. Recently, there are some vehicles that inject fuel with a fuel injection valve instead of a carburetor. In this case, as shown in FIG. 2, fuel injection is performed based on the inputs of the intake air temperature sensor C and the cooling water temperature sensor D, based on the inputs of the crank rotation sensor A and the throttle opening sensor B, which indicates the opening of the throttle valve. The injection time length is determined by correcting the injection time of the valve.
【０００３】0003
【発明が解決しようとする課題】スノーモービルは、外
気温が、極めて低温の場所で使用することがある。そし
て、エンジンの排気孔に連結した排気チャンバーが、オ
ーバークールになることがある。これによって排気チャ
ンバー内を流れる排気ガス温度が低下し、排気ガスの流
速が低下して、排気チャンバー内の排気の脈動とのタイ
ミングがずれて、流入空気量が減少する。気化器を用い
る場合には、吸入空気量の減少によって負圧が低下して
燃料流量も低下するが、スロットル開度とクランク回転
で、吸入空気量を予測する電子燃料噴射では、排気チャ
ンバー効果の低下によって吸入空気量が減少しても対応
することができず、燃料噴射量が多くなることになって
オーバーリッチになり、失火する原因になる不都合があ
る。[Problems to be Solved by the Invention] Snowmobiles are sometimes used in places where the outside temperature is extremely low. Additionally, the exhaust chamber connected to the engine's exhaust port may become overcooled. As a result, the temperature of the exhaust gas flowing in the exhaust chamber decreases, the flow rate of the exhaust gas decreases, the timing with the pulsation of the exhaust gas in the exhaust chamber is shifted, and the amount of incoming air decreases. When using a carburetor, the negative pressure decreases due to the decrease in the amount of intake air, and the fuel flow rate also decreases. However, with electronic fuel injection, which predicts the amount of intake air using throttle opening and crank rotation, the exhaust chamber effect is reduced. Even if the amount of intake air decreases due to the drop, it cannot be coped with, and the amount of fuel injected increases, resulting in over-richness, which inconveniently causes a misfire.
【０００４】かかる点に鑑み、この発明は、排気チャン
バーに排気チャンバー壁温センサーを取付け、これを電
子コントロールユニットに入力してフィードバックさせ
、排気チャンバーが所定温度以下の場合には、温度に応
じて燃料噴射時間が短くなるように補正し、オーバーリ
ッチになるのを防止できる燃料噴射二サイクルエンジン
の噴射制御装置を得ることを目的とする。[0004] In view of this, the present invention attaches an exhaust chamber wall temperature sensor to the exhaust chamber, inputs this to an electronic control unit and feeds it back, and when the temperature of the exhaust chamber is below a predetermined temperature, An object of the present invention is to obtain an injection control device for a fuel injection two-stroke engine that can correct fuel injection time to shorten it and prevent it from becoming overrich.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、この発明の燃料噴射二サイクルエンジンの噴射制御
装置は、クランク回転センサーとスロットル開度センサ
ーの入力を基準にし、吸気温センサーと冷却水温センサ
ーに加えて、排気チャンバー壁温センサーを入力して補
正し、燃料噴射弁の噴射時間長さを調節することにある
。[Means for Solving the Problems] In order to achieve the above object, the injection control device for a fuel injection two-cycle engine of the present invention uses inputs from a crank rotation sensor and a throttle opening sensor as a reference, and uses inputs from an intake air temperature sensor and a cooling In addition to the water temperature sensor, the exhaust chamber wall temperature sensor is input and corrected to adjust the injection time length of the fuel injector.
【０００６】[0006]
【作用】排気チャンバー壁温センサーによって、排気チ
ャンバー温度が所定温度以下のとき、温度に応じて一定
割合で、噴射時間が短くなるようにする。これによって
、吸入空気量に燃料噴射量を合せるようにできて、オー
バーリッチになるのを防止できて、失火を防ぐことがで
きる。[Operation] When the exhaust chamber temperature is below a predetermined temperature, the exhaust chamber wall temperature sensor shortens the injection time at a fixed rate according to the temperature. This allows the amount of fuel injection to match the amount of intake air, prevents over-richness, and prevents misfires.
【０００７】[0007]
【実施例】以下、本発明の実施例を図１乃至図５によっ
て説明する。エンジン１には、点火パルスなどによるク
ランク回転センサー２とスロットルバルブの開度を示す
スロットル開度センサー３を取付ける。又、クリーナー
ボックス４に吸気温センサー５を取付け、シリンダー６
の冷却水を検出する冷却水温センサー７を取付ける。更
に、エンジン１のシリンダー６の排気孔８に連結する排
気チャンバー９に、排気チャンバー壁温センサー１０を
取付ける。クランク回転センサー２とスロットル開度セ
ンサー３は燃料噴射弁１１の噴射時間を決める基準にな
るように電子コントロールユニットに入力する。そして
、吸気温センサー５と冷却水温センサー７と排気チャン
バー壁温センサー１０の信号を電子コントロールユニッ
トに入力して、基準噴射時間を補正する。Embodiments Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 1 to 5. The engine 1 is equipped with a crank rotation sensor 2 that detects ignition pulses, etc., and a throttle opening sensor 3 that indicates the opening of a throttle valve. In addition, the intake air temperature sensor 5 is attached to the cleaner box 4, and the cylinder 6 is
Attach the cooling water temperature sensor 7 to detect the cooling water. Furthermore, an exhaust chamber wall temperature sensor 10 is attached to the exhaust chamber 9 connected to the exhaust hole 8 of the cylinder 6 of the engine 1. The crank rotation sensor 2 and the throttle opening sensor 3 are input to the electronic control unit so as to serve as criteria for determining the injection time of the fuel injection valve 11. Then, the signals from the intake air temperature sensor 5, the cooling water temperature sensor 7, and the exhaust chamber wall temperature sensor 10 are input to the electronic control unit to correct the reference injection time.
【０００８】排気チャンバー壁温センサー１０は、図２
に示すように、壁温が２００℃以下のとき、温度に応じ
て噴射時間が短くなるように、噴射時間長さを補正する
。これによって、エンジン１の出力は、図３に点線で示
すようにできて正常に運転でき、吸気量の減少に伴って
、燃料噴射量を少くでき、オーバーリッチを防止できる
。又、図４は、電子コントロールユニットのフローチャ
ートを示すものである。The exhaust chamber wall temperature sensor 10 is shown in FIG.
As shown in the figure, when the wall temperature is 200° C. or lower, the injection time length is corrected so that the injection time becomes shorter according to the temperature. As a result, the output of the engine 1 is generated as shown by the dotted line in FIG. 3, allowing normal operation, and as the intake air amount decreases, the fuel injection amount can be reduced, and overrich can be prevented. Further, FIG. 4 shows a flowchart of the electronic control unit.
【０００９】[0009]
【発明の効果】以上説明したように、この発明は、上述
のように構成したので、排気チャンバー壁温センサーに
よって、所定温度以下のとき、温度に応じて、クランク
回転センサーとスロットルセンサーを基準にして燃料噴
射時間長さを定める電子コントロールユニットの噴射時
間長さを所定割合で短くできて、燃料噴射量を少くでき
る。これによって、排気チャンバーがオーバークールの
ために発生する排気脈動のミスマッチによる吸気量減少
に、燃料噴射量を合せることができて、オーバーリッチ
を防ぐことができて、正常な運転ができるようになり、
エンジン出力も正常になる。[Effects of the Invention] As explained above, since the present invention is configured as described above, when the exhaust chamber wall temperature sensor is below a predetermined temperature, the crank rotation sensor and the throttle sensor are used as a reference. The injection time length of the electronic control unit that determines the fuel injection time length can be shortened by a predetermined ratio, and the fuel injection amount can be reduced. This makes it possible to match the fuel injection amount to the reduction in intake air volume due to a mismatch in exhaust pulsation that occurs due to overcooling of the exhaust chamber, preventing over-rich conditions and allowing normal operation. ,
Engine output also becomes normal.
【図１】本発明の実施例を示す平面図である。FIG. 1 is a plan view showing an embodiment of the present invention.
【図２】本発明の実施例を示す排気チャンバー壁温セン
サーによる燃料噴射量補正を示すグラフ図である。FIG. 2 is a graph diagram showing fuel injection amount correction by an exhaust chamber wall temperature sensor according to an embodiment of the present invention.
【図３】本発明の実施例を示すエンジン出力の変化を示
すグラフ図である。FIG. 3 is a graph diagram showing changes in engine output according to an embodiment of the present invention.
【図４】本発明の実施例を示す電子コントロールユニッ
トのフローチャート図である。FIG. 4 is a flowchart diagram of an electronic control unit showing an embodiment of the present invention.
【図５】従来例を示す側面図である。FIG. 5 is a side view showing a conventional example.
１ エンジン ２ クランク回転センサー ３ スロットル開度センサー ５ 吸気温センサー ７ 冷却水温センサー １０ 排気チャンバー壁温センサー １１ 燃料噴射弁 1 Engine 2 Crank rotation sensor 3 Throttle opening sensor 5 Intake temperature sensor 7 Cooling water temperature sensor 10 Exhaust chamber wall temperature sensor 11 Fuel injection valve
Claims (1)
度センサーの入力を基準にし、吸気温センサーと冷却水
温センサーに加えて、排気チャンバー壁温センサーを入
力して補正し、燃料噴射弁の噴射時間長さを調節するこ
とを特徴とする燃料噴射二サイクルエンジンの噴射制御
装置Claim 1: Based on the inputs of the crank rotation sensor and throttle opening sensor, in addition to the intake air temperature sensor and cooling water temperature sensor, the exhaust chamber wall temperature sensor is also input and corrected, and the injection time length of the fuel injection valve is determined. An injection control device for a fuel-injected two-cycle engine, characterized by adjusting the
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17329591A JPH04370339A (en) | 1991-06-19 | 1991-06-19 | Injection control device for fuel injection two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17329591A JPH04370339A (en) | 1991-06-19 | 1991-06-19 | Injection control device for fuel injection two-cycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04370339A true JPH04370339A (en) | 1992-12-22 |
Family
ID=15957799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17329591A Pending JPH04370339A (en) | 1991-06-19 | 1991-06-19 | Injection control device for fuel injection two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04370339A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0735257A2 (en) * | 1995-03-31 | 1996-10-02 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust pulsation control system for an internal combustion engine |
-
1991
- 1991-06-19 JP JP17329591A patent/JPH04370339A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0735257A2 (en) * | 1995-03-31 | 1996-10-02 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust pulsation control system for an internal combustion engine |
| EP0735257B1 (en) * | 1995-03-31 | 2001-10-31 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust pulsation control system for an internal combustion engine |
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