JPS623905U

JPS623905U -

Info

Publication number: JPS623905U
Application number: JP9652785U
Authority: JP
Priority date: 1985-06-25
Filing date: 1985-06-25
Publication date: 1987-01-10

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はカム制御軸の回転角と出力電力との関係を
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図はバルブリフト特性を示す
グラフ、第１０図および第１１図はこの考案の他
の実施例を示す図であり、第１０図はその要部平
面図、第１１図は第１０図の―矢視図、
第１２図および第１３図は従来の吸・排気弁リフ
ト制御装置を示す図であり、第１２図はその縦断
面図、第１３図は第１２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（ポテンシヨメータ）
。 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. Fig. 5 is an exploded perspective view, Fig. 5 is a diagram showing the configuration of the control circuit, Fig. 6 is a flowchart showing the control program, and Fig. 7 is an explanation of each operating state range from the relationship between engine speed and throttle valve opening. Figure 8
Figure A is a graph showing the relationship between the rotation angle of the cam control shaft and output power, Figure 8B is a graph showing the relationship between output voltage and flag Fth, Figure 9 is a graph showing valve lift characteristics, and Figure 10 is a graph showing the relationship between output voltage and flag Fth. and FIG. 11 are views showing another embodiment of this invention, FIG. 10 is a plan view of the main part thereof, FIG. 11 is a view taken along the - arrow in FIG. 10,
12 and 13 are diagrams showing a conventional intake/exhaust valve lift control device, with FIG. 12 being a longitudinal sectional view thereof, and FIG. 13 being a view taken in the direction of the X direction in FIG. 12. 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; The cam control shaft is once rotated from the actual position by an amount of rotation that exceeds the amount of rotation to reach the target position set based on the above, and then the cam control shaft is driven to return to the target position by corrected rotation in the opposite direction by a predetermined amount. a control means for driving the means;
An intake/exhaust valve lift control device for an internal combustion engine, characterized by comprising: