JPS63156448U - - Google Patents

Description

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

第１図は本考案の空燃比制御装置の概略を示す
構成図、第２図は第１図の装置中の制御回路の具
体的構成を示すブロツク図、第３図はＣＰＵの動
作を示すフロー図、第４図は減速時空燃比リーン
化領域を示す図である。 主要部分の符号の説明、１……気化器、２……
エアクリーナ、３……絞り弁、４……吸気マニホ
ールド、７……負圧スイツチ、１０……絶対圧セ
ンサ、１１……クランク角センサ、１２……冷却
水温センサ、１６……車速センサ、１７……大気
圧センサ、１８……クラツチスイツチ、３７……
スロー燃料供給通路、３９，４１……スロー空気
導入通路。 Fig. 1 is a block diagram showing the outline of the air-fuel ratio control device of the present invention, Fig. 2 is a block diagram showing the specific structure of the control circuit in the device of Fig. 1, and Fig. 3 is a flowchart showing the operation of the CPU. FIG. 4 is a diagram showing a lean air-fuel ratio region during deceleration. Explanation of symbols of main parts, 1... vaporizer, 2...
Air cleaner, 3... Throttle valve, 4... Intake manifold, 7... Negative pressure switch, 10... Absolute pressure sensor, 11... Crank angle sensor, 12... Cooling water temperature sensor, 16... Vehicle speed sensor, 17... ...Atmospheric pressure sensor, 18...Clutch switch, 37...
Slow fuel supply passage, 39, 41...Slow air introduction passage.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 気化器を備えた車載内燃エンジンの減速状態を
検出したときに前記気化器のスロー燃料供給系に
よる供給混合気の空燃比をリーン化せしめる空燃
比調整手段を有する空燃比制御装置であつて、前
記内燃エンジンの温度を検出する第１検出手段と
、車両走行パラメータを検出する第２検出手段と
、前記第１検出手段による検出温度が第１所定温
度以下であるとき、若しくは前記検出温度が前記
第１所定温度より大で第２所定温度以下でかつ前
記第２検出手段による検出値が所定値以下である
ときにリーン化停止指令を発生する制御手段とを
含み、前記空燃比調整手段は前記リーン化停止指
令に応じて減速状態に拘らず前記スロー燃料供給
系による供給混合気の空燃比のリーン化を停止す
ることを特徴とする空燃比制御装置。 An air-fuel ratio control device comprising an air-fuel ratio adjusting means for making the air-fuel ratio of the air-fuel mixture supplied by the slow fuel supply system of the carburetor leaner when a deceleration state of an on-vehicle internal combustion engine equipped with a carburetor is detected, a first detecting means for detecting the temperature of the internal combustion engine; a second detecting means for detecting vehicle running parameters; and when the detected temperature by the first detecting means is below a first predetermined temperature, control means for generating a lean stop command when the temperature is higher than a first predetermined temperature and below a second predetermined temperature and a detected value by the second detection means is below a predetermined value; An air-fuel ratio control device, characterized in that, in response to a deceleration stop command, the slow fuel supply system stops making the air-fuel ratio of the supplied air-fuel mixture lean regardless of the deceleration state.