JPS6331212U

JPS6331212U -

Info

Publication number: JPS6331212U
Application number: JP12476886U
Authority: JP
Priority date: 1986-08-14
Filing date: 1986-08-14
Publication date: 1988-02-29

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
の考案の第１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４図Ａ、同図Ｂはこの実施例の異常時
に対処する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電源電圧の波形図で
ある。第６図はこの考案の第２実施例の作用を説
明する油温の波形図である。第７図Ａ、同図Ｂは
この考案の第３実施例の異常時に対処する制御動
作を説明する流れ図である。第８図、第１０図は
それぞれステツプ指令、ランプ指令による正常時
の駆動パルスとモータ駆動電流を示す波形図、第
９図、第１１図はそれぞれ第３実施例、第４実施
例の作用を説明する駆動パルス及びモータ駆動電
流の波形図である。第１２図は従来例の吸排気弁
リフト可変機構の縦断面図、第１３図は同じく平
面図、第１４図は同じくリフト特性を示す線図、
第１５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１６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。第１７図はモータ特性を説明する線図で
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、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……
駆動制御手段、２６……判別手段、２７……異常
時判別手段、２８Ａ……電源電圧検出手段、２８
Ｂ……機関温度検出手段、２８Ｃ……モータ駆動
電流検出手段、２８Ｄ……モータ駆動パルス検出
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
……電流検出抵抗。 Figure 1 is a conceptual block diagram of this invention, Figure 2A is a block diagram of the first embodiment of this invention, Figure B is a circuit diagram of the motor drive circuit of this embodiment, and Figure 3 is this embodiment. 4A and 4B are flowcharts illustrating the control operation to deal with abnormalities in this embodiment, and FIG. 5 is a power supply voltage waveform diagram illustrating the operation of this embodiment. It is. FIG. 6 is an oil temperature waveform diagram illustrating the operation of the second embodiment of this invention. FIGS. 7A and 7B are flowcharts illustrating control operations for dealing with abnormalities in the third embodiment of this invention. Figures 8 and 10 are waveform diagrams showing normal drive pulses and motor drive currents due to step commands and ramp commands, respectively, and Figures 9 and 11 are waveform diagrams showing the effects of the third and fourth embodiments, respectively. FIG. 2 is a waveform diagram of drive pulses and motor drive current to be explained. FIG. 12 is a vertical cross-sectional view of a conventional intake/exhaust valve lift variable mechanism, FIG. 13 is a plan view, and FIG. 14 is a diagram showing lift characteristics.
FIG. 15 is a diagram illustrating each operating range based on the relationship between the engine speed and the throttle valve opening, and FIG. 16 is a diagram illustrating the output characteristics of the potentiometer. FIG. 17 is a diagram illustrating motor characteristics. 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...
Drive control means, 26...Discrimination means, 27...Abnormality discrimination means, 28A...Power supply voltage detection means, 28
B... Engine temperature detection means, 28C... Motor drive current detection means, 28D... Motor drive pulse detection means, 31... Drive circuit, 32... Potentiometer, 33... Rotation speed sensor, 34... Aperture Valve opening sensor, 35...Control unit, 36
...Current detection resistor.

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 driving and controlling the driving means to match the target position. An intake/exhaust valve lift control device for an internal combustion engine, comprising means for determining whether or not there is a fluctuating abnormality, and means for interrupting, continuing, or stopping the lift control depending on the determined abnormality status. .