JPH09126055A - Flow rate control device of carburetor - Google Patents

Flow rate control device of carburetor

Info

Publication number
JPH09126055A
JPH09126055A JP30649895A JP30649895A JPH09126055A JP H09126055 A JPH09126055 A JP H09126055A JP 30649895 A JP30649895 A JP 30649895A JP 30649895 A JP30649895 A JP 30649895A JP H09126055 A JPH09126055 A JP H09126055A
Authority
JP
Japan
Prior art keywords
solenoid valve
carburetor
jet
stroke position
electronic controller
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
Application number
JP30649895A
Other languages
Japanese (ja)
Inventor
Kokichi Kawachi
弘吉 河内
Masaaki Nakachi
正明 中地
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries 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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP30649895A priority Critical patent/JPH09126055A/en
Publication of JPH09126055A publication Critical patent/JPH09126055A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a flow rate control device of a single cylinder four-cycle engine capable of correctly controlling the air fuel ratio using a solenoid valve which is inexpensive and simple in constitution. SOLUTION: An auxiliary jet and a solenoid valve to open/close a fuel flow passage connected to the jet are provided on a carburetor in parallel to a main jet, an oxygen sensor 20 is provided on an exhaust tube, and a piston stroke position detector 30 is arranged on a cam shaft part. While the engine is operated, the fuel of appropriate amount is fed from a main jet, and the data signal on the oxygen concentration in the exhaust gas to be outputted from the oxygen sensor is inputted in an electronic controller 40 to judge the acceptance/rejection of the air fuel ratio. When the mixture is lean, a solenoid valve of an auxiliary jet is opened by the control signal from the electronic controller only for the prescribed period of time to make a correction so as to obtain appropriate air fuel ratio. The electronic controller receives the signal from the piston stroke position detector to calculate the stroke position of the piston, and when the stroke reaches the prescribed value, the solenoid valve is energized to open the valve.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は単シリンダ4サイク
ル汎用エンジンの気化器の流量制御装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control device for a carburetor of a single-cylinder 4-cycle general-purpose engine.

【0002】[0002]

【従来の技術】一般に、自動車用ガソリンエンジンにお
いては、排出ガス規制への対応、燃料消費効率や動力性
能などを考慮して、気化器で形成される混合気の空燃比
を広範な使用条件のもとで的確に制御する必要がある。
2. Description of the Related Art Generally, in a gasoline engine for an automobile, the air-fuel ratio of the air-fuel mixture formed by the carburetor is set in a wide range of operating conditions in consideration of exhaust gas regulations, fuel consumption efficiency and power performance. It is necessary to control it accurately.

【0003】この要求に対応すべく、エンジンの排気管
路に酸素センサ(以降、O2 センサと記す)を配設し排
ガス中の酸素濃度を検出して空燃比を検知し、その情報
を気化器にフィードバックして空燃比を運転条件に即応
するよう的確に制御する電子制御気化器が採用されてい
る。この方式の気化器は一般にフィードバック気化器と
呼ばれている。
In order to meet this demand, an oxygen sensor (hereinafter referred to as an O 2 sensor) is provided in the exhaust pipe of the engine, the oxygen concentration in the exhaust gas is detected to detect the air-fuel ratio, and the information is vaporized. An electronically controlled carburetor is used to feed back the air-fuel ratio and to control the air-fuel ratio accurately so as to immediately respond to operating conditions. This type of vaporizer is generally called a feedback vaporizer.

【0004】フィードバック気化器においては、メイン
系統あるいはスロー系統に電磁ソレノイド弁装置を配設
して燃料供給量あるいはエアブリード量を制御してい
る。ここで使用される電磁ソレノイド弁は一般にデュー
ティソレノイド弁であり、エンジンの作動の1サイクル
内でON−OFFの動作を繰り返し、そのトータルで開
閉時間を制御する方式になっている。
In the feedback carburetor, an electromagnetic solenoid valve device is arranged in the main system or the slow system to control the fuel supply amount or the air bleed amount. The electromagnetic solenoid valve used here is generally a duty solenoid valve, and has a system in which ON / OFF operations are repeated within one cycle of engine operation, and the total opening / closing time is controlled.

【0005】[0005]

【発明が解決しようとする課題】前述の従来の技術の説
明で引用したフィードバック気化器は多シリンダの自動
車用のエンジンに取付けられる。このため気化器を通過
する空気の流れは比較的脈動分の小さい連続した流れと
なるので、メインジェットに通じる燃料流路の開閉制御
にデューティソレノイド弁を採用することが可能とな
る。
The feedback carburetor cited in the above description of the prior art is mounted on a multi-cylinder automotive engine. For this reason, the flow of air passing through the vaporizer becomes a continuous flow with a relatively small amount of pulsation, and thus it becomes possible to employ a duty solenoid valve for the opening / closing control of the fuel flow path leading to the main jet.

【0006】しかしながら、単シリンダで4サイクル方
式のエンジンにおいては、気化器を通過する空気の流れ
は脈動の大きい間欠流となり、燃料を注入する時期が限
定されるため、前記デューティソレノイド弁の使用は必
ずしも適当ではなく、またデューティソレノイド弁は価
格が高いので汎用エンジンに対してはコスト面からも適
していない。
However, in a single-cylinder, four-cycle engine, the duty solenoid valve is not used because the flow of air passing through the carburetor is an intermittent flow with large pulsation and the timing of fuel injection is limited. It is not always suitable, and the duty solenoid valve is expensive, so that it is not suitable for a general-purpose engine in terms of cost.

【0007】本発明の目的は、構成が単純であり低価格
のソレノイド弁を使用して空燃比を的確に制御し得る気
化器の流量制御装置を提供するにある。
An object of the present invention is to provide a carburetor flow rate control device capable of accurately controlling an air-fuel ratio by using a solenoid valve having a simple structure and a low price.

【0008】[0008]

【課題を解決するための手段】第1発明の気化器の流量
制御装置は、単シリンダ4サイクル汎用エンジンの気化
器において、メインジェット12と並列に設けられる補
助ジェット13と、該補助ジェットに通じる燃料流路を
開閉するソレノイド弁14と、排気管6に配設され排ガ
ス中の酸素濃度を検出する酸素センサ20と、カム軸4
に取付けられたタイミングピン31と、エンジン本体側
に取付けられたタイミングセンサ32よりなるピストン
行程位置検出器30と、前記酸素センサから出力される
酸素濃度信号及び前記ピストン行程位置検出器から出力
されるピストン行程位置の信号を入力し、所要の信号処
理をして前記ソレノイド弁に制御信号を出力する電子式
コントローラ40とを有して成ることを特徴としてい
る。
A flow control device for a carburetor according to a first aspect of the present invention is a carburetor for a single-cylinder, four-cycle, general-purpose engine, and an auxiliary jet 13 provided in parallel with a main jet 12 and a fuel communicating with the auxiliary jet. A solenoid valve 14 that opens and closes the flow path, an oxygen sensor 20 that is arranged in the exhaust pipe 6 to detect the oxygen concentration in the exhaust gas, and a camshaft 4.
A piston stroke position detector 30 including a timing pin 31 attached to the engine and a timing sensor 32 attached to the engine body side, an oxygen concentration signal output from the oxygen sensor, and an output from the piston stroke position detector. An electronic controller 40 for inputting a signal of a piston stroke position, performing a required signal processing, and outputting a control signal to the solenoid valve.

【0009】第2発明の気化器の流量制御装置は、第1
発明において吸気管5に配設されエンジンの暖機状態を
検出する温度センサ7と、気化器のチョーク弁8を開閉
するチョーク開閉ソレノイド弁9とを有し、前記電子式
コントローラ40は温度センサから入力した信号に基づ
きチョーク開閉ソレノイド弁に制御信号を出力すること
を特徴としている。
According to a second aspect of the present invention, there is provided a carburetor flow rate control device comprising:
In the present invention, a temperature sensor 7 arranged in the intake pipe 5 for detecting a warm-up state of the engine and a choke opening / closing solenoid valve 9 for opening / closing the choke valve 8 of the carburetor are provided. It is characterized by outputting a control signal to the choke opening / closing solenoid valve based on the input signal.

【0010】[0010]

【発明の実施の形態】図1は請求項1及び請求項2によ
る発明の実施の形態に係る気化器の流量制御装置の構成
を説明する模式図で、図2は図1に示されている気化器
の要部断面図である。以下、図1,2を参照して気化器
の流量制御装置の構成について説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram for explaining the configuration of a carburetor flow rate control device according to an embodiment of the invention according to claims 1 and 2, and FIG. 2 is shown in FIG. It is a principal part sectional drawing of a vaporizer. The configuration of the flow rate control device for the carburetor will be described below with reference to FIGS.

【0011】図1において、1はエンジン本体、2はピ
ストン、3はクランク軸、4はカム軸、5は吸気管、6
は排気管、7は温度センサ、8はチョーク弁、9はチョ
ーク開閉ソレノイド弁、10は気化器、20は排気管6
に配設され排ガス中の酸素濃度を検出するO2 センサ、
30はカム軸4に固設されたタイミングピン31とエン
ジン本体1側に固設され前記タイミングピンの通過を検
出するタイミングセンサ32とによって形成されるピス
トン行程位置検出器、40は電子式コントローラであ
る。
In FIG. 1, 1 is an engine body, 2 is a piston, 3 is a crankshaft, 4 is a camshaft, 5 is an intake pipe, and 6
Is an exhaust pipe, 7 is a temperature sensor, 8 is a choke valve, 9 is a choke opening / closing solenoid valve, 10 is a carburetor, and 20 is an exhaust pipe 6.
An O 2 sensor for detecting the oxygen concentration in the exhaust gas,
Reference numeral 30 is a piston stroke position detector formed by a timing pin 31 fixed to the camshaft 4 and a timing sensor 32 fixed to the engine body 1 side to detect passage of the timing pin, and 40 is an electronic controller. is there.

【0012】図2は図1における気化器10の主要部を
示す縦断面図で、11はフロート室、12はメインジェ
ット、13は補助ジェット(エンリッチジェット)、1
4は補助ジェット13に通じる燃料流路を開閉するソレ
ノイド弁、15はベンチュリ部である。
FIG. 2 is a longitudinal sectional view showing the main part of the vaporizer 10 in FIG. 1, 11 is a float chamber, 12 is a main jet, 13 is an auxiliary jet (enriched jet), 1
Reference numeral 4 is a solenoid valve for opening and closing a fuel flow path leading to the auxiliary jet 13, and 15 is a venturi portion.

【0013】次に前述の構成の装置による流量制御の作
用について説明する。エンジンを始動して運転状態には
いると、作動状況に応じて設定される基本的な量の燃料
がメインジェット12から供給され、リーンな混合気が
シリンダ内に吸い込まれる。排気管6に固設したO2
ンサ20は排ガス中の酸素濃度を検出し、そのデータの
信号を電子式コントローラ40に送信する。
Next, the operation of the flow rate control by the device having the above-mentioned structure will be described. When the engine is started and is in an operating state, a basic amount of fuel set according to the operating condition is supplied from the main jet 12, and a lean air-fuel mixture is sucked into the cylinder. The O 2 sensor 20 fixed to the exhaust pipe 6 detects the oxygen concentration in the exhaust gas and sends a signal of the data to the electronic controller 40.

【0014】該電子式コントローラは入力したデータ信
号に基づいて空燃比の適否を判断する。空燃比が適正値
と較べて低いと判断された場合はソレノイド弁14に通
電して補助ジェット13から設定した時間燃料を補給
し、適正な空燃比になるように補正する。適正値になっ
ていればソレノイド弁14への通電回路は閉じておき、
常に目標とする適正空燃比に調整する。
The electronic controller determines the suitability of the air-fuel ratio based on the input data signal. When it is determined that the air-fuel ratio is lower than the proper value, the solenoid valve 14 is energized to supplement the fuel from the auxiliary jet 13 for a set time, and the air-fuel ratio is corrected to the proper value. If it is an appropriate value, close the energizing circuit to the solenoid valve 14,
Always adjust to the target proper air-fuel ratio.

【0015】ところで、単シリンダの4サイクルエンジ
ンでは吸気が間欠流となるので、補助ジェット13から
補給される燃料の量はソレノイド弁14の開弁時間を一
定に保っても開弁させる時期によって変化することが確
かめられている。図3はその推移を示す実験結果で、2
個のメインジェット(A)及び(B)の場合について、
ソレノイド弁14の開弁時間を一定(この実験では10
msec)にして、開弁時期と空燃比の関係を調べた結
果が示されている。
By the way, in a single-cylinder four-cycle engine, the intake air becomes an intermittent flow, so the amount of fuel replenished from the auxiliary jet 13 changes depending on the timing of opening the solenoid valve 14 even if the valve opening time is kept constant. It is confirmed to do. Figure 3 shows the experimental results that show the transition.
For the case of individual main jets (A) and (B),
The opening time of the solenoid valve 14 is fixed (10 in this experiment).
msec), the result of examining the relationship between the valve opening timing and the air-fuel ratio is shown.

【0016】このグラフから分かるように、空燃比を補
正するためには、ソレノイド弁14の開弁時期を、4サ
イクルエンジンの作動サイクルを形成する吸入・圧縮・
膨張・排気の4行程のうち、どの行程でのどのピストン
位置とするのかを指示する必要がある。
As can be seen from this graph, in order to correct the air-fuel ratio, the valve opening timing of the solenoid valve 14 is changed to the intake / compression / compression / stroke which forms the operation cycle of the 4-cycle engine.
It is necessary to instruct which piston position in which stroke of the four strokes of expansion / exhaust.

【0017】ピストン行程位置検出器30はカム軸4の
1回転ごと、従ってエンジンの作動の1サイクルごとに
基準位置の信号を検出して電子式コントローラ40に送
信する。電子式コントローラ40は、ピストン行程位置
検出器30から送られる信号に基づいて、ピストン2が
どの行程でのどの位置にあるかを演算し、ピストン2が
所要の行程位置に達したときにソレノイド弁14に通電
して開弁させる。
The piston stroke position detector 30 detects a reference position signal for each rotation of the cam shaft 4, and thus for each cycle of engine operation, and transmits it to the electronic controller 40. The electronic controller 40 calculates the position in which stroke the piston 2 is located based on the signal sent from the piston stroke position detector 30, and the solenoid valve is operated when the piston 2 reaches the required stroke position. Energize 14 to open the valve.

【0018】この開弁時間及び開弁時期と空燃比の関係
は前述のように実験によって求められ、本発明において
は、排気行程及び吸入行程以外の時期に開弁することに
より良好な制御結果が得られている。
The relationship between the valve opening time and the valve opening timing and the air-fuel ratio is obtained by an experiment as described above. In the present invention, a good control result can be obtained by opening the valve at a time other than the exhaust stroke and the intake stroke. Has been obtained.

【0019】なお、請求項2の発明によれば、次のよう
にオートチョークの機能が実現される。吸気管5または
シリンダヘッド近傍に配設した温度センサ7によって始
動時のエンジンの暖機状態を検出し、その信号を電子式
コントローラ40に送信する。電子式コントローラ40
は温度センサ7から入力した信号のレベルによってチョ
ーク弁開閉の制御について判断し、チョーク開閉ソレノ
イド弁に制御信号を出力する。
According to the invention of claim 2, the function of the auto choke is realized as follows. The temperature sensor 7 arranged near the intake pipe 5 or the cylinder head detects the warm-up state of the engine at the time of starting, and sends the signal to the electronic controller 40. Electronic controller 40
Determines the control of the choke valve opening / closing based on the level of the signal input from the temperature sensor 7, and outputs a control signal to the choke opening / closing solenoid valve.

【0020】[0020]

【発明の効果】本発明では前述のような構成とすること
により、単シリンダ4サイクルエンジンでは吸気管内の
脈動が大きく、従来技術では困難であった単純なON−
OFFソレノイド弁による適正空燃比への制御を的確且
つ容易に実現できるようになった。なお、安価なON−
OFFソレノイド弁を使用できるので制御装置のコスト
低減にも寄与できる。
As described above, according to the present invention, the single cylinder four-cycle engine has a large pulsation in the intake pipe and has a simple ON-state which is difficult in the prior art.
The control to the proper air-fuel ratio by the OFF solenoid valve can now be realized accurately and easily. In addition, cheap ON-
Since the OFF solenoid valve can be used, the cost of the control device can be reduced.

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

【図1】本発明の実施の形態に係る気化器の流量制御装
置の構成説明模式図。
FIG. 1 is a schematic diagram illustrating the configuration of a flow rate control device for a carburetor according to an embodiment of the present invention.

【図2】図1に示されている気化器の要部断面図。FIG. 2 is a sectional view of a main part of the vaporizer shown in FIG.

【図3】ソレノイド弁の開弁時間及び開弁時期と空燃比
との関係を調べた実験結果の説明図。
FIG. 3 is an explanatory diagram of an experimental result in which a relationship between a valve opening time and a valve opening timing of a solenoid valve and an air-fuel ratio is investigated.

【符号の説明】[Explanation of symbols]

4…カム軸、6…排気管、7…温度センサ、8…チョー
ク弁、9…チョーク開閉ソレノイド弁、10…気化器、
12…メインジェット、13…補助ジェット、14…ソ
レノイド弁、20…酸素センサ、30…ピストン行程位
置検出器、31…タイミングピン、32…タイミングセ
ンサ、40…電子式コントローラ。
4 ... Cam shaft, 6 ... Exhaust pipe, 7 ... Temperature sensor, 8 ... Choke valve, 9 ... Choke opening / closing solenoid valve, 10 ... Vaporizer,
12 ... Main jet, 13 ... Auxiliary jet, 14 ... Solenoid valve, 20 ... Oxygen sensor, 30 ... Piston stroke position detector, 31 ... Timing pin, 32 ... Timing sensor, 40 ... Electronic controller.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 単シリンダ4サイクル汎用エンジンの気
化器において、メインジェット(12)と並列に設けら
れる補助ジェット(13)と、該補助ジェットに通じる
燃料流路を開閉するソレノイド弁(14)と、排気管
(6)に配設され排ガス中の酸素濃度を検出する酸素セ
ンサ(20)と、カム軸(4)に取付けられたタイミン
グピン(31)と、エンジン本体側に取付けられたタイ
ミングセンサ(32)よりなるピストン行程位置検出器
(30)と、前記酸素センサから出力される酸素濃度信
号及び前記ピストン行程位置検出器から出力されるピス
トン行程位置の信号を入力し、所要の信号処理をして前
記ソレノイド弁に制御信号を出力する電子式コントロー
ラ(40)とを有して成ることを特徴とする気化器の流
量制御装置。
1. A carburetor for a single-cylinder 4-cycle general-purpose engine, an auxiliary jet (13) provided in parallel with a main jet (12), and a solenoid valve (14) for opening and closing a fuel flow path leading to the auxiliary jet. An oxygen sensor (20) arranged in the exhaust pipe (6) for detecting the oxygen concentration in the exhaust gas, a timing pin (31) attached to the camshaft (4), and a timing sensor (mounted on the engine body side ( 32), a piston stroke position detector (30), an oxygen concentration signal output from the oxygen sensor, and a piston stroke position signal output from the piston stroke position detector are input to perform necessary signal processing. And an electronic controller (40) for outputting a control signal to the solenoid valve.
【請求項2】 吸気管(5)に配設されエンジンの暖機
状態を検出する温度センサ(7)と、気化器のチョーク
弁(8)を開閉するチョーク開閉ソレノイド弁(9)と
を有し、前記電子式コントローラ(40)は温度センサ
から入力した信号に基づきチョーク開閉ソレノイド弁に
制御信号を出力することを特徴とする前記請求項1記載
の気化器の流量制御装置。
2. A temperature sensor (7) arranged in the intake pipe (5) for detecting a warm-up state of the engine, and a choke opening / closing solenoid valve (9) for opening / closing the choke valve (8) of the carburetor. The flow controller for a carburetor according to claim 1, wherein the electronic controller (40) outputs a control signal to a choke opening / closing solenoid valve based on a signal input from a temperature sensor.
JP30649895A 1995-10-31 1995-10-31 Flow rate control device of carburetor Pending JPH09126055A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30649895A JPH09126055A (en) 1995-10-31 1995-10-31 Flow rate control device of carburetor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30649895A JPH09126055A (en) 1995-10-31 1995-10-31 Flow rate control device of carburetor

Publications (1)

Publication Number Publication Date
JPH09126055A true JPH09126055A (en) 1997-05-13

Family

ID=17957755

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30649895A Pending JPH09126055A (en) 1995-10-31 1995-10-31 Flow rate control device of carburetor

Country Status (1)

Country Link
JP (1) JPH09126055A (en)

Similar Documents

Publication Publication Date Title
US6176209B1 (en) Electromagnetically operated valve control system and the method thereof
EP0640758B1 (en) Charge Forming Device for Gas fuelled Engines and Method of operating the same
KR830008021A (en) Electronically controlled fuel injection device for spark-ignition internal combustion engines
EP0719913A1 (en) Two-cycle stroke engine
JPH1037727A (en) Intake/exhaust valve control device of multiple cylinder engine and control method therefor
JP2004132314A (en) Control device for internal combustion engine
JPH09126055A (en) Flow rate control device of carburetor
JP2002235606A (en) Egr control device for internal combustion engine
US4705011A (en) Air intake side secondary air supply system for an internal combustion engine with an improved operation for a large amount of the secondary air
US20100043754A1 (en) Controller for internal combustion engine
JPS5827827A (en) Fuel supplier of internal combustion engine
JPH1162658A (en) Control device for internal combustion engine
JPH0623734Y2 (en) Air-fuel ratio controller for internal combustion engine
JPH0666226A (en) Fuel injector for internal combustion engine
JPH05106431A (en) Secondary air feeding control device for catalyst converter
JPH0232843Y2 (en)
JP2762142B2 (en) Fuel injection device for two-cycle engine
JPH01155044A (en) Electronic control fuel injection system for internal combustion engine
JP3013706B2 (en) Flow control valve control method
KR960003253B1 (en) Fuel feeding device for a gas engine
JP3277300B2 (en) Air-fuel ratio control device for internal combustion engine with valve characteristic switching device
JP2004176546A (en) Control method for internal combustion engine with fuel injection device
JPS5985464A (en) Carburetor with variable venturi part
JPS63198775A (en) Fuel pressure control device
JP2001140661A (en) Control device for internal combustion engine

Legal Events

Date Code Title Description
A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20060110

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20060307

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20060523