JPS61183406U

JPS61183406U -

Info

Publication number: JPS61183406U
Application number: JP6871885U
Authority: JP
Priority date: 1985-05-08
Filing date: 1985-05-08
Publication date: 1986-11-15

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図はその制御回路の
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Ａ、は駆動軸の回転角と出力電圧との関係を
示す図、第８図Ｂは出力電圧とフラグＦｔｈとの
関係を示す図、第９図は中心値と出力電圧との差
から安定域を説明するための説明図、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Ｘ方向矢視図である。１２……吸・排気弁、２０……リフト制御カム
、２０ａ〜２０ｅ……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）、３６，３７……運転
状態検出手段（回転数センサ、絞り弁開度センサ
）、４０……位置検出手段（ポテンシヨンメータ
）。 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 longitudinal cross-sectional view of the variable lift mechanism, FIG. 3 is a plan view of the main part thereof, FIG. 4 is an exploded perspective view showing the attachment part of the lift control cam, and 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 8A is a diagram showing the rotation angle of the drive shaft and output. FIG. 8B is a diagram showing the relationship between the output voltage and flag Fth, FIG. 9 is an explanatory diagram for explaining the stability region from the difference between the center value and the output voltage, and FIG. Figure 11 is a graph showing valve lift characteristics, Figures 11 and 12 are diagrams showing a conventional intake/exhaust valve lift control device, Figure 11 is a longitudinal cross-sectional view thereof, and Figure 12 is the It is a directional view. 12... Intake/exhaust valve, 20... Lift control cam, 20a to 20e... Cam surface, 21... Cam control shaft, 26... Drive means (actuator), 27
. . . control means (control circuit), 36, 37 . . . operating state detection means (rotation speed sensor, throttle valve opening sensor), 40 . . . position detection means (potentiometer).

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 for rotationally changing the cam to a target position so as to become a target cam surface, an operating state detecting means for detecting the operating state of the engine, a position detecting means for detecting the actual position of the cam control shaft, and a drive means for detecting the actual position of the cam control shaft; drive the driving means to rotate the cam control shaft from the actual position toward the target position set based on the above, and at least when an output value corresponding to the actual position is less than a predetermined value, an abnormality occurs. An intake/exhaust valve lift control device for an internal combustion engine, comprising: control means for determining that the cam control shaft has been activated, and for stopping the drive of the drive means to stop the operation of the cam control shaft.