JPS62160709U

JPS62160709U -

Info

Publication number: JPS62160709U
Application number: JP4874186U
Authority: JP
Priority date: 1986-04-01
Filing date: 1986-04-01
Publication date: 1987-10-13

Description

[Brief explanation of the drawing]

第１図はこの考案の概念構成図、第２図Ａはこ
の考案の一実施例のブロツク構成図、第２図Ｂは
この実施例のモータ駆動回路の回路図、第３図、
第４図はこの実施例の動作を説明する流れ図であ
る。第５図はこの実施例によるＫＰ，ＫＤの特性
線図、第６図はこの実施例の作用を説明する波形
図である。第７図は先順の吸排気弁リフト可変機
構の縦断面図、第８図は同じく平面図、第９図は
同じくリフト特性を示す線図、第１０図は同じく
機関回転数とスロツトル弁開度との関係から各運
転域を説明する線図、第１１図は同じくポテンシ
ヨメータの出力特性を示す線図、第１２図は先願
における作用を説明する波形図である。１…吸気弁用カム、２…吸気弁、３…弁ばね、
４…ロツカーアーム、４Ａ…ロツカーアーム背面
、６…レバー、８…リフト制御カム、８Ａ〜８Ｄ
…カム面、１０…コイルばね、１１…カム制御軸
、２０…吸排気弁リフト可変機構、２１…ＤＣモ
ータ、２２…運転状態検出手段、２３…目標位置
設定手段、２４…位置検出手段、２５…フイード
バツク制御手段、２６…速度検出憶手段、２７…
ゲイン可変手段、３１…駆動回路、３２…ポテン
シヨメータ、３３…回転数センサ、３４…絞り弁
開度センサ、３５…コントロールユニツト。 Fig. 1 is a conceptual block diagram of this invention, Fig. 2A is a block diagram of an embodiment of this invention, Fig. 2B is a circuit diagram of a motor drive circuit of this embodiment, Fig. 3,
FIG. 4 is a flowchart explaining the operation of this embodiment. FIG. 5 is a characteristic diagram of KP and KD according to this embodiment, and FIG. 6 is a waveform diagram illustrating the operation of this embodiment. Fig. 7 is a vertical cross-sectional view of the variable intake/exhaust valve lift mechanism, Fig. 8 is a plan view, Fig. 9 is a diagram showing lift characteristics, and Fig. 10 is a graph showing engine speed and throttle valve opening. FIG. 11 is a diagram illustrating the output characteristics of the potentiometer, and FIG. 12 is a waveform diagram illustrating the operation in the prior application. 1...Intake valve cam, 2...Intake valve, 3...Valve spring,
4...Rotsuker arm, 4A...Rotsuker arm back, 6...Lever, 8...Lift control cam, 8A to 8D
...Cam surface, 10...Coil spring, 11...Cam control shaft, 20...Intake/exhaust valve lift variable mechanism, 21...DC motor, 22...Operating state detection means, 23...Target position setting means, 24...Position detection means, 25 ...Feedback control means, 26...Speed detection storage means, 27...
Gain variable means, 31... Drive circuit, 32... Potentiometer, 33... Rotation speed sensor, 34... Throttle valve opening sensor, 35... Control unit.

Claims

[Scope of utility model registration request]

The lift control cam has a lift control cam formed with a plurality of cam surfaces and a cam control shaft connected to the lift control cam via an elastic member, and the lift control cam rotates in stages by elastic energy stored in the elastic member. an intake/exhaust valve lift variable mechanism that changes the lift characteristics according to changes; and a D that rotates the cam control shaft.
a C motor, a target position setting means for setting a target position of the cam control shaft according to the engine operating state, a position detecting means for detecting the actual position of the cam control shaft, and a position detecting means for detecting the actual position of the cam control shaft; In an internal combustion engine intake/exhaust valve lift control device comprising feedback control means for driving and controlling the DC motor so as to reach the target position, the valve reaches the target position or a set position having a predetermined width around the target position. An intake/exhaust system for an internal combustion engine, characterized in that it is provided with speed detection means for detecting the immediately preceding speed of the cam control shaft, and gain variable means for changing the control gain of the feedback control according to the detected speed. Valve lift control device.