JPS6326751U

JPS6326751U -

Info

Publication number: JPS6326751U
Application number: JP1986121185U
Authority: JP
Priority date: 1986-08-06
Filing date: 1986-08-06
Publication date: 1988-02-22

Description

[Brief explanation of the drawing]

第１図は本考案の基本概念図、第２〜５図は本
考案に係るエンジンの上死点検出装置の一実施例
を示す図であり、第２図はその全体構成図、第３
図はその基準クランク角演算のメインルーチンを
示すフローチヤート、第４図はその筒内圧力波形
の重心位置を算出するサブルーチンを示すフロー
チヤート、第５図はその作用を説明するためのタ
イミングチヤート、第６，７図は従来のクランク
角センサを示す図であり、第６図はその出力信号
のタイミングチヤート、第７図はその調整方法を
示す図である。１１……エンジン、２０……圧力センサ（圧力
検出手段）、２１……クランク角センサ（クラン
ク角検出手段）、２２……コントロールユニツト
（フユエルカツト検出手段、重心位置算出手段、
上死点検出手段）。 Fig. 1 is a basic conceptual diagram of the present invention, Figs. 2 to 5 are diagrams showing an embodiment of the engine top dead center detection device according to the present invention, Fig. 2 is an overall configuration diagram thereof, and Fig. 3
The figure is a flowchart showing the main routine for calculating the reference crank angle, FIG. 4 is a flowchart showing the subroutine for calculating the center of gravity position of the in-cylinder pressure waveform, and FIG. 5 is a timing chart for explaining the operation. 6 and 7 are diagrams showing a conventional crank angle sensor, FIG. 6 is a timing chart of its output signal, and FIG. 7 is a diagram showing its adjustment method. 11...Engine, 20...Pressure sensor (pressure detection means), 21...Crank angle sensor (crank angle detection means), 22...Control unit (fuel cut detection means, center of gravity position calculation means,
top dead center detection means).

Claims

[Claims for Utility Model Registration] (a) Pressure detection means for detecting the cylinder pressure of the engine; (b) Crank angle detection means for detecting the crank angle of the engine; (c) The engine is in a fuel cut state. (d) a center of gravity calculation means that calculates the center of gravity position of the cylinder pressure waveform based on the outputs of the crank angle detection means and the pressure detection means synchronized with this signal; (e) the center of gravity calculation means that the engine A top dead center detection means for detecting the compression top dead center of the piston based on the position of the center of gravity of the in-cylinder pressure waveform when a predetermined period of time has elapsed from the start of the fuel cut when the fuel cut state is entered. Top dead center detection device for engines.