JPS6214105U

JPS6214105U -

Info

Publication number: JPS6214105U
Application number: JP10588385U
Authority: JP
Priority date: 1985-07-11
Filing date: 1985-07-11
Publication date: 1987-01-28
Anticipated expiration: 2000-07-11
Also published as: JPH059449Y2

Description

[Brief explanation of drawings]

第１図はこの考案に係る内燃機関の吸・排気弁
リフト制御装置を示す全体構成図、第２図〜第９
図はこの考案の一実施例を示す図であり、第２図
はそのリフト可変機構の縦断面図、第３図はその
要部平面図、第４図はそのリフト制御カムの取付
部を示す分解斜視図、第５図は多段ダイヤフラム
式アクチユエータを示すその部分断面図、第６図
はその制御回路の構成を示す図、第７図は制御プ
ログラムを示すフローチヤート、第８図はエンジ
ン回転数と絞り弁開度との関係から各運転域を説
明する説明図、第９図はバルブリフト特性を示す
グラフである。１２……吸・排気弁、２０……リフト制御カム
、２０ａ〜２０ｅ……カム面、２３……カム制御
軸、２７……多段ダイヤフラム式アクチユエータ
、２８……制御回路（制御手段）、３２ａ〜３２
ｄ……ダイヤフラム、３５ａ〜３５ｄ……圧力室
、３８ａ〜３８ｄ……３ポート切換弁（切換手段
）、５６，５７……運転状態検出手段。 Figure 1 is an overall configuration diagram showing the intake/exhaust valve lift control device for an internal combustion engine according to this invention, and Figures 2 to 9
The figure shows an embodiment of this invention; Fig. 2 is a vertical sectional view of the variable lift mechanism, Fig. 3 is a plan view of the main part thereof, and Fig. 4 shows the mounting part of the lift control cam. An exploded perspective view, FIG. 5 is a partial sectional view showing the multi-stage diaphragm actuator, FIG. 6 is a diagram showing the configuration of its control circuit, FIG. 7 is a flowchart showing the control program, and FIG. 8 is a diagram showing the engine rotation speed. FIG. 9 is an explanatory diagram illustrating each operating range from the relationship between the throttle valve opening degree and the throttle valve opening degree, and FIG. 9 is a graph showing the valve lift characteristics. 12... Suction/exhaust valve, 20... Lift control cam, 20a-20e... Cam surface, 23... Cam control shaft, 27... Multi-stage diaphragm actuator, 28... Control circuit (control means), 32a- 32
d...Diaphragm, 35a-35d...Pressure chamber, 38a-38d...3-port switching valve (switching means), 56, 57... Operating state detection means.

Claims

[Scope of utility model registration request]

A variable intake/exhaust valve lift mechanism that changes the lift characteristics of the intake/exhaust valves in response to stepwise changes in a lift control cam that has multiple cam surfaces, and multiple pressure points that introduce negative pressure or atmospheric pressure. A multi-stage diaphragm that has a plurality of diaphragms defining a chamber, and rotates a cam control shaft that rotatably supports the lift control cam so that it becomes a target cam surface in response to changes in pressure within the pressure chamber. a switching means for operating the multi-stage diaphragm actuator in stages by switching between introducing negative pressure or atmospheric pressure into the pressure chamber, an operating state detecting means for detecting an operating state of the engine, An intake/exhaust valve lift control device for an internal combustion engine, comprising: control means for switching and controlling the switching means so that the lift control cam is set at a target cam surface.