JPS6328809U

JPS6328809U -

Info

Publication number: JPS6328809U
Application number: JP12199686U
Authority: JP
Priority date: 1986-08-08
Filing date: 1986-08-08
Publication date: 1988-02-25

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、同図Ｂはこ
の実施例のモータ駆動回路の回路図、第３図、第
４図はこの実施例のフイードバツク制御動作を説
明する流れ図、第５図はこの実施例の作用を説明
する駆動パルスの出力パターンを説明する波形図
、第６図は第５図のａ部拡大波形図である。第７
図はこの実施例におけるバイアス分の内容を示す
線図、第８図はモータ温度に対する回転数―トル
ク特性を示す線図である。第９図は従来例の吸排
気弁リフト可変機構の縦断面図、第１０図は同じ
く平面図、第１１図は同じくリフト特性を示す線
図、第１２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１
３図は同じくポテンシヨメータの出力特性を示す
線図である。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、２３……目標位置設定手段、２４……位置
検出手段、２５……偏差演算手段、２６……操作
量演算手段、２７……出力手段、２９……バイア
ス分演算手段、３０……付加手段、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、３６……電圧検出センサ
、３７……水温センサ。 Figure 1 is a conceptual block diagram of this invention, Figure 2A is a block diagram of an embodiment of this invention, Figure B is a circuit diagram of a motor drive circuit of this embodiment, and Figures 3 and 4 are A flowchart explaining the feedback control operation of this embodiment, FIG. 5 is a waveform diagram explaining the output pattern of the drive pulse to explain the operation of this embodiment, and FIG. 6 is an enlarged waveform diagram of part a of FIG. 5. . 7th
The figure is a diagram showing the content of the bias component in this embodiment, and FIG. 8 is a diagram showing the rotation speed-torque characteristic with respect to motor temperature. Fig. 9 is a vertical cross-sectional view of a conventional intake/exhaust valve lift variable mechanism, Fig. 10 is a plan view, Fig. 11 is a diagram showing the lift characteristics, and Fig. 12 is a graph showing the engine speed and throttle valve opening. Diagram explaining each operating range from the relationship with degree, 1st
FIG. 3 is a diagram similarly showing the output characteristics of the potentiometer. 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, 23... Target position setting means, 24... Position detection means , 25... Deviation calculation means, 26... Manipulated amount calculation means, 27... Output means, 29... Bias component calculation means, 30... Addition means, 31... Drive circuit, 32... Potentiometer, 33 ... Rotation speed sensor, 34 ... Throttle valve opening sensor, 35 ...
Control unit, 36... voltage detection sensor, 37... water temperature sensor.

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,
means for driving the cam control shaft; means for setting a target position of the cam control shaft according to engine operating conditions; means for detecting the actual position of the cam control shaft; and means for detecting the actual position of the cam control shaft. An intake/exhaust valve lift control device for an internal combustion engine, comprising means for calculating a deviation from the target position, means for calculating a manipulated variable from the deviation and a control gain, and means for outputting the manipulated variable to the drive means. An intake/exhaust valve lift control device for an internal combustion engine, comprising means for calculating a bias component of the manipulated variable and means for adding the bias component to the manipulated variable.