JPH0427121U

JPH0427121U -

Info

Publication number: JPH0427121U
Application number: JP6738490U
Authority: JP
Priority date: 1990-06-25
Filing date: 1990-06-25
Publication date: 1992-03-04

Description

[Brief explanation of the drawing]

第１〜第３図は本考案の第１実施例を示すもの
で、第１図は吸気装置およびその制御システムを
示すシステム図、開閉弁制御に用いるマツプの説
明図、第３図はこの実施例の作用を示すエンジン
出力特性図である。また、第４、第５図は本考案
の第２実施例を示すもので、第４図は第２実施例
における吸気装置の要部構成図、第５図は第２実
施例の作用を示すエンジン出力特性図である。そ
して、第６、第７図は本考案の第３実施例を示す
もので、第６図は第３実施例における吸気装置の
要部構成図、第７図は第３実施例の作用を示すエ
ンジン出力特性図である。なお、第８図は独立通
路をテーパー状にした場合の吸気装置の要部構成
図、第９図はその問題点を示すエンジン出力特性
図である。１１，１１′，１１″……吸気系、１４……燃
焼室、１５，１５′，１５″……独立通路、１５
ａ，１５ａ′，１５ａ″……第１通路部、１５ｂ
，１５ｂ′，１５ｂ″……第２通路部、１６，１
６′，１６″……サージタンク（容積部）、２２
，２２″，２７……開閉弁（バルブ手段）、２４
……コントロールユニツト（制御手段）。 1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a system diagram showing an intake device and its control system, an explanatory diagram of a map used for on-off valve control, and FIG. 3 is an embodiment of this invention. FIG. 3 is an engine output characteristic diagram showing an example effect. 4 and 5 show a second embodiment of the present invention, FIG. 4 is a configuration diagram of the main parts of the intake device in the second embodiment, and FIG. 5 shows the operation of the second embodiment. It is an engine output characteristic diagram. 6 and 7 show a third embodiment of the present invention, FIG. 6 is a block diagram of the main parts of the intake device in the third embodiment, and FIG. 7 shows the operation of the third embodiment. It is an engine output characteristic diagram. Incidentally, FIG. 8 is a block diagram of the main parts of the intake system when the independent passage is tapered, and FIG. 9 is an engine output characteristic diagram showing the problem. 11, 11', 11''...Intake system, 14...Combustion chamber, 15, 15', 15''...Independent passage, 15
a, 15a', 15a''...first passage section, 15b
, 15b', 15b''...second passage section, 16,1
6′, 16″……Surge tank (volume part), 22
, 22'', 27...Opening/closing valve (valve means), 24
...Control unit (control means).

Claims

[Scope of utility model registration request]

An intake system for an engine having a volume part in an intake system and an independent passage leading from the volume part to a combustion chamber,
The independent passage is formed such that the passage cross-sectional area becomes smaller as it goes downstream, and the passage cross-sectional area decreasing portion in the passage is comprised of a first passage portion having a large cross-sectional area reduction rate and a second passage portion having a small cross-sectional area reduction rate. a valve means which opens and closes the first passage part which is divided along the flow path direction and has a large cross-sectional area reduction rate, and a control means which opens and operates the valve means at a predetermined engine speed or higher. An engine intake device characterized by being provided with.