JPS61125611U

JPS61125611U -

Info

Publication number: JPS61125611U
Application number: JP895485U
Authority: JP
Priority date: 1985-01-24
Filing date: 1985-01-24
Publication date: 1986-08-07

Description

[Brief explanation of the drawing]

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１
０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図はリフト制御カムの取付部
を示す分解斜視図、第５図は制御回路の構成を示
す図、第６図は制御プログラムを示すフローチヤ
ート、第７図はエンジン回転数と絞り弁開度との
関係から各運転状態域を説明する図、第８図はカ
ム制御軸の回転角と目標位置電圧との関係を示す
グラフ、第９図はカム制御軸の回転角とレバー変
位置との関係を示すグラフ、第１０図はバルブリ
フト特性を示すグラフ、第１１図および第１２図
は従来の吸・排気弁リフト制御装置を示す図であ
り、第１１図はその縦断面図、第１２図は第１１
図の方向矢視図、第１３図は問題点を説明す
るための説明図である。２０……リフト制御カム、２０ａ〜２０ｄ……
カム面、２１……カム制御軸、２６……駆動手段
（アクチユエータ）、２７……制御手段（制御回
路）、２９……弾性部材（リターンスプリング）
、３６〜３９……運転状態検出手段、４０……位
置検出手段。 Fig. 1 is an overall configuration diagram showing the intake/exhaust valve lift control device for an internal combustion engine according to this invention, and Figs.
Figure 0 shows one embodiment of this invention, and the second
The figure is a vertical sectional view of the variable lift mechanism, FIG. 3 is a plan view of its main parts, FIG. 4 is an exploded perspective view showing the attachment part of the lift control cam, FIG. 5 is a diagram showing the configuration of the control circuit, Figure 6 is a flowchart showing the control program, Figure 7 is a diagram explaining each operating state range from the relationship between engine speed and throttle valve opening, and Figure 8 is a diagram showing the relationship between the rotation angle of the cam control shaft and the target position voltage. FIG. 9 is a graph showing the relationship between the rotation angle of the cam control shaft and the lever displacement position. FIG. 10 is a graph showing the valve lift characteristics. FIGS. 11 is a longitudinal sectional view of the exhaust valve lift control device, and FIG. 12 is a longitudinal sectional view thereof.
The direction arrow view of the figure and FIG. 13 are explanatory diagrams for explaining the problem. 20... Lift control cam, 20a to 20d...
Cam surface, 21... Cam control shaft, 26... Drive means (actuator), 27... Control means (control circuit), 29... Elastic member (return spring)
, 36-39... Operating state detection means, 40... Position 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 a cam control shaft that rotatably supports the lift control cam. A drive means that rotates the cam to a target position so that it becomes a target cam surface when it is driven, and returns it to a neutral position via an elastic member so that it becomes a predetermined neutral cam surface when it stops driving, and detects the operating state of the engine. an operating state detecting means; a position detecting means for detecting the actual position of the cam control shaft; and a drive means for rotating the cam control shaft from the actual position toward the target position set based on the operating state of the engine. driving means;
An intake/exhaust valve lift control device for an internal combustion engine, comprising: control means for determining a failure when a failure occurs and stopping driving of the drive means to return the cam control shaft to the neutral position.