JPS6357306U

JPS6357306U -

Info

Publication number: JPS6357306U
Application number: JP15065986U
Authority: JP
Priority date: 1986-10-02
Filing date: 1986-10-02
Publication date: 1988-04-16

Description

[Brief explanation of drawings]

第１図は本考案の構成を示す機能ブロツク図、
第２図は本考案の一実施例を示す吸・排気弁リフ
ト可変機構の縦断面図、第３図は同上の要部平面
図、第４図はリフト制御カムの部分の分解斜視図
、第５図は制御回路のブロツク図、第６図Ａ，Ｂ
は制御プログラムのフローチヤート、第７図は運
転状態のエリアを示す図、第８図はリフト特性を
示す図、第９図はエンジン回転数とリフト量とに
対応する危険運転領域を示す図である。１１……吸・排気弁駆動カム、１２……吸・排
気弁、１３……ロツカアーム、１５……レバー、
２０……リフト制御カム、２０ａ〜２０ｆ……カ
ム面、２１……カム制御軸、２４……捩りコイル
スプリング、２６……アクチユエータ、２７……
制御回路、３０……ＣＰＵ、３６……回転数セン
サ、３７……絞り弁開度センサ、３９……ニユー
トラルスイツチ、４０……クラツチスイツチ、４
１……ポテンシヨメータ。 Figure 1 is a functional block diagram showing the configuration of the present invention.
Fig. 2 is a vertical cross-sectional view of a variable intake/exhaust valve lift mechanism showing an embodiment of the present invention, Fig. 3 is a plan view of the main parts of the same, Fig. 4 is an exploded perspective view of the lift control cam portion, and Fig. 4 is an exploded perspective view of the lift control cam. Figure 5 is a block diagram of the control circuit, Figure 6 A and B
7 is a flow chart of the control program, FIG. 7 is a diagram showing the operating state area, FIG. 8 is a diagram showing the lift characteristics, and FIG. 9 is a diagram showing the dangerous operation area corresponding to the engine speed and lift amount. be. 11... Suction/exhaust valve drive cam, 12... Suction/exhaust valve, 13... Locker arm, 15... Lever,
20... Lift control cam, 20a-20f... Cam surface, 21... Cam control shaft, 24... Torsion coil spring, 26... Actuator, 27...
Control circuit, 30... CPU, 36... Rotation speed sensor, 37... Throttle valve opening sensor, 39... Neutral switch, 40... Clutch switch, 4
1... Potentiometer.

Claims

[Scope of utility model registration request]

an intake/exhaust valve lift variable mechanism that varies the lift characteristics of the intake/exhaust valves according to stepwise changes of a lift control cam having a plurality of cam surfaces; an operating state detection means that detects the operating state of the engine; In a variable valve lift control device comprising a control means for switching and controlling a lift control cam so as to select a predetermined cam surface according to an area of engine operating conditions, a variable valve lift control device is configured to detect when the engine speed exceeds a limit speed. 1. A variable valve lift control device, comprising: a valve lift regulating means at the time of over-rotation, which detects and regulates the control means so that the valve lift is set to a low lift side at this time.