JPS62117229U

JPS62117229U -

Info

Publication number: JPS62117229U
Application number: JP407686U
Authority: JP
Priority date: 1986-01-17
Filing date: 1986-01-17
Publication date: 1987-07-25

Description

[Brief explanation of the drawing]

第１図は本考案の実施例の平面図、第２図は各
吸気弁の動作時期及びリフトと、燃料噴射時期を
示すグラフ、第３図はエンジンの低負荷時におけ
る燃料の供給状態を示す説明図、第４図はエンジ
ンの高負荷時における燃料の供給状態を示す説明
図、第５図は第３の吸気弁の開弁時期とリーン限
界との関係を示すグラフ、第６図は第３の吸気弁
の閉弁時期と軸トルクとの関係を示すグラフであ
る。１……主吸気ポート、２……副吸気ポート、４
……第１吸気ポート、５……第２吸気ポート、６
……第１吸気弁、７……燃焼室、８……第２吸気
弁、９……吸気制御弁、１０……第３吸気ポート
、１１……第３吸気弁、１２……吸気通路、１３
……スロツトルバルブ、１４……燃料噴射弁。 Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a graph showing the operating timing and lift of each intake valve, and fuel injection timing, and Fig. 3 shows the fuel supply state when the engine is under low load. 4 is an explanatory diagram showing the fuel supply state during high engine load, FIG. 5 is a graph showing the relationship between the opening timing of the third intake valve and the lean limit, and FIG. 6 is a graph showing the relationship between the opening timing of the third intake valve and the lean limit. 3 is a graph showing the relationship between the valve closing timing of the intake valve No. 3 and the shaft torque. 1...Main intake port, 2...Sub-intake port, 4
...First intake port, 5...Second intake port, 6
...First intake valve, 7...Combustion chamber, 8...Second intake valve, 9...Intake control valve, 10...Third intake port, 11...Third intake valve, 12...Intake passage, 13
...Throttle valve, 14...Fuel injection valve.

Claims

[Scope of utility model registration request]

A first intake port that is always open to generate a swirl in the intake air supplied into the combustion chamber, and a first intake port that has an intake control valve that opens only in a high-load, high-speed operating range of the engine and supplies straight intake air into the combustion chamber. The first, second and third intake ports are connected to each other through the first, second and third intake valves. and connected to the combustion chamber respectively.
In a dual intake valve engine in which the opening timing of the intake valve is set near the center of the intake stroke, the upstream sides of the first and second intake ports are merged to form a main intake port, and the upstream side of the third intake port is is a auxiliary intake port isolated from the main intake port, and on the upstream side of these main and auxiliary intake ports, only the auxiliary intake port is opened when the engine is under low load, and both the main and auxiliary intake ports are opened when the engine is under high load. A dual intake valve engine, characterized in that a common throttle valve that opens both intake ports is provided, and the fuel injection valve is provided on the upstream side of the throttle valve.