JPS5857712U

JPS5857712U - Engine air flow measuring device

Info

Publication number: JPS5857712U
Application number: JP14773381U
Authority: JP
Inventors: 三分一　寛; 忠弘山本; 須合　雄孝; 太田　忠樹
Original assignee: 日産自動車株式会社
Priority date: 1981-10-06
Filing date: 1981-10-06
Publication date: 1983-04-19

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は、従来のカルマン渦検出型空気流量測定装置の
ブロック構成図、第２図は、同じくそのカルマンセンサ
の模式図、第３図は、カルマン周　。波数と空気流量との関係を示す線図、第４図は、この考
案の一実施例を示すブロック構成図、第５図は、第４図
の実施例の動作説明に供する各信号波形図、第６図は、
この考案の他の実施例を示すブロック構成図、第７図ａ
、　　ｂは第６図の実施例−におけるマイクロコンピュ
ータの割込ルーチン及び演算ルーチンの動作フロー図で
ある。１・・・・・・カルマンセンサ、２・・・・・・波形整
形回路、３・・・・・・エツジパルス発生回路、４・・
・・・・クロックパルス発生回路、５，９・・・・・・
カウンタ、６．１０・・・・・・保持回路、８・・・・
・・機関回転同期信号発生回路、１１・・・・・・除算
器、１２・・・・・・出力ホールド回路、１３．１４・
・・・・・割込信号発生回路、１５・・・・・・ラッチ
回路、１６・・・・・・マイクロコンピュータ。FIG. 1 is a block diagram of a conventional Karman vortex detection type air flow measuring device, FIG. 2 is a schematic diagram of the Karman sensor, and FIG. 3 is a diagram of the Karman vortex. A diagram showing the relationship between the wave number and the air flow rate, FIG. 4 is a block diagram showing an embodiment of the invention, and FIG. 5 is a signal waveform diagram for explaining the operation of the embodiment of FIG. 4. Figure 6 shows
A block diagram showing another embodiment of this invention, FIG. 7a
, b is an operation flow diagram of an interrupt routine and an arithmetic routine of the microcomputer in the embodiment of FIG. 6. 1...Kalman sensor, 2...Waveform shaping circuit, 3...Edge pulse generation circuit, 4...
...Clock pulse generation circuit, 5,9...
Counter, 6.10...Holding circuit, 8...
... Engine rotation synchronization signal generation circuit, 11 ... Divider, 12 ... Output hold circuit, 13.14.
...Interrupt signal generation circuit, 15...Latch circuit, 16...Microcomputer.

Claims

[Scope of utility model registration request]

a Kalman sensor, a waveform shaping circuit that shapes the waveform of the Kalman sensor output and outputs a Kalman pulse train, an engine rotation synchronization signal generation circuit that outputs a signal synchronized with the engine rotation, a clock pulse generation circuit, and a waveform shaping circuit that outputs a Kalman pulse train by shaping the waveform of the Kalman sensor output; a counter that counts clock pulses from the clock pulse generation circuit that are input between the synchronization signals from the synchronization signal generation circuit; a counter that counts the number of the cull seven man pulses that are input between the synchronization signals; 1. An engine air flow rate measuring device, comprising: arithmetic means for calculating an air flow rate based on the count outputs of both counters.