JPS62200104U

JPS62200104U -

Info

Publication number: JPS62200104U
Application number: JP8903486U
Authority: JP
Priority date: 1986-06-11
Filing date: 1986-06-11
Publication date: 1987-12-19

Description

[Brief explanation of drawings]

第１図はこの考案の概念構成図、第２図はこの
考案の一実施例のブロツク構成図、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図はこの実施例の直前速度に対する所定幅を
示す特性線図、第６図、第７図はこの実施例によ
る作用を説明する波形図である。第８図は従来例
の吸排気弁リフト可変機構の縦断面図、第９図は
同じく平面図、第１０図は同じくリフト特性を示
す線図、第１１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１２図は同じくポテンシヨメータの出力特性を
示す線図、第１３図は従来例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……駆動手段、２１Ａ……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……速度検出手段
、２７……所定幅可変手段、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。 Figure 1 is a conceptual block diagram of this invention, Figure 2 is a block diagram of an embodiment of this invention, Figures 3 and 4.
The figure is a flowchart explaining the operation of this embodiment.
FIG. 5 is a characteristic diagram showing a predetermined width with respect to the immediately preceding speed of this embodiment, and FIGS. 6 and 7 are waveform diagrams illustrating the effects of this embodiment. Fig. 8 is a vertical cross-sectional view of a conventional intake/exhaust valve lift variable mechanism, Fig. 9 is a plan view, Fig. 10 is a diagram showing lift characteristics, and Fig. 11 is a graph showing engine speed and throttle valve opening. A diagram explaining each operating range in relation to the degree of
FIG. 12 is a diagram similarly showing the output characteristics of the potentiometer, and FIG. 13 is a waveform diagram explaining the operation in the conventional example. 1...Intake valve cam, 2...Intake valve, 3...Valve spring, 4...Rotsuker arm, 4A...Rotsuker arm back, 6...Lever, 8...Lift control cam, 8A-8D...Cam surface , 10... Coil spring, 11... Cam control shaft, 20... Intake/exhaust valve lift variable mechanism, 21... Drive means, 21A... DC motor, 22... Operating state detection means, 23... Target position setting Means, 24... Position detection means, 25...
Feedback control means, 26... Speed detection means, 27... Predetermined width 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. A mechanism that changes lift characteristics according to changes,
a driving means for rotating the cam control shaft; a means for setting a target position of the cam control shaft according to engine operating conditions; a means for detecting the actual position of the cam control shaft; In the intake/exhaust valve lift control device for an internal combustion engine, the control device includes means for feedback controlling the drive means so that the drive means is at the target position, wherein 1. An intake/exhaust valve lift control device for an internal combustion engine, comprising means for detecting the speed of a cam control shaft, and means for changing the predetermined width according to the detected speed.