JPS62174225U - - Google Patents
Info
- Publication number
- JPS62174225U JPS62174225U JP6211786U JP6211786U JPS62174225U JP S62174225 U JPS62174225 U JP S62174225U JP 6211786 U JP6211786 U JP 6211786U JP 6211786 U JP6211786 U JP 6211786U JP S62174225 U JPS62174225 U JP S62174225U
- Authority
- JP
- Japan
- Prior art keywords
- output
- output signal
- phase
- ultrasonic
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007493 shaping process Methods 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000010363 phase shift Effects 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Combined Controls Of Internal Combustion Engines (AREA)
Description
第１図はこの考案に係る装置の構成図、第２図
は従来装置の構成図、第３図は従来およびこの考
案に係る装置の動作波形図である。
２……渦発生体、４……超音波発信子、５……
超音波受信子、６……発振回路、７……電圧制御
位相偏移回路、８……第１の波形整形回路、９…
…位相比較器、１０……ループフイルタ、１１…
…ローパスフイルタ、１５……吸入空気通路、１
７……第２の波形整形回路、１８……圧力センサ
、１９……増幅器、２０……インバータ、２２…
…エアチヤンバ。尚、図中同一符号は同一または
相当部分を示す。
FIG. 1 is a block diagram of the apparatus according to this invention, FIG. 2 is a block diagram of a conventional apparatus, and FIG. 3 is an operating waveform diagram of the conventional apparatus and the apparatus according to this invention. 2... Vortex generator, 4... Ultrasonic transmitter, 5...
Ultrasonic receiver, 6...Oscillation circuit, 7...Voltage control phase shift circuit, 8...First waveform shaping circuit, 9...
...Phase comparator, 10...Loop filter, 11...
...Low pass filter, 15...Intake air passage, 1
7...Second waveform shaping circuit, 18...Pressure sensor, 19...Amplifier, 20...Inverter, 22...
...Air Chamber. Note that the same reference numerals in the figures indicate the same or corresponding parts.
Claims (1)
、この渦発生体の下流に発生するカルマン渦列の
流れを横切つて超音波を伝幡させるように設けら
れた超音波発信子、この超音波発信子を励振させ
る発振回路、カルマン渦によつて位相変調された
超音波発信子からの超音波を受信する超音波受信
子、超音波受信子の出力を整形する第１波形整形
回路、第１波形整形回路の出力信号を第１の入力
とする位相比較器、位相比較器の出力の不要周波
数成分を除去するループフイルタ、発振回路の出
力信号からの位相偏移角をループフイルタの出力
電圧に対応して制御する電圧制御位相偏移回路、
電圧制御位相偏移回路の出力を第２の入力とし第
１の入力と第２の入力の位相差を出力する位相比
較器の出力信号から搬送周波数成分を除去するロ
ーパスフイルタ、超音波受信子近傍の吸入空気通
路内圧力を導入されその高周波圧力変動を吸収す
るエアチヤンバ、このエアチヤンバの圧力に応動
して出力する圧力センサ、圧力センサの出力信号
とローパスフイルタの出力信号との差動和を整形
して出力する第２の波形整形回路を偏えたことを
特徴とする内燃機関の吸入空気量検出装置。 A vortex generator disposed in an intake air passage of an internal combustion engine; an ultrasonic transmitter disposed to propagate ultrasonic waves across the flow of a Karman vortex street generated downstream of the vortex generator; an oscillation circuit that excites an ultrasonic transmitter, an ultrasonic receiver that receives ultrasonic waves from the ultrasonic transmitter whose phase is modulated by a Karman vortex, a first waveform shaping circuit that shapes the output of the ultrasonic receiver; A phase comparator whose first input is the output signal of the first waveform shaping circuit, a loop filter that removes unnecessary frequency components from the output of the phase comparator, and an output of the loop filter that determines the phase deviation angle from the output signal of the oscillation circuit. Voltage controlled phase shift circuit that controls according to voltage,
A low-pass filter that removes the carrier frequency component from the output signal of a phase comparator that takes the output of the voltage-controlled phase shift circuit as its second input and outputs the phase difference between the first and second inputs, near the ultrasonic receiver. An air chamber that absorbs high-frequency pressure fluctuations into which the pressure inside the intake air passage is introduced, a pressure sensor that outputs an output in response to the pressure in the air chamber, and a differential sum of the output signal of the pressure sensor and the output signal of the low-pass filter is shaped. 1. An intake air amount detection device for an internal combustion engine, characterized in that a second waveform shaping circuit that outputs an output is biased.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6211786U JPS62174225U (en) | 1986-04-24 | 1986-04-24 | |
| US07/038,607 US4815324A (en) | 1986-04-24 | 1987-04-15 | Intake air meter for an internal combustion engine |
| KR2019870005666U KR900009144Y1 (en) | 1986-04-24 | 1987-04-20 | Air volume detective system of in engine |
| DE19873713523 DE3713523A1 (en) | 1986-04-24 | 1987-04-22 | AIR INLET MEASURING DEVICE FOR A COMBUSTION ENGINE |
| AU71921/87A AU574015B2 (en) | 1986-04-24 | 1987-04-23 | Air intake meter for an internal combustion engine |
| FR878705755A FR2597972B1 (en) | 1986-04-24 | 1987-04-23 | AIR INTAKE MEASURING APPARATUS FOR AN INTERNAL COMBUSTION ENGINE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6211786U JPS62174225U (en) | 1986-04-24 | 1986-04-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62174225U true JPS62174225U (en) | 1987-11-05 |
Family
ID=30896085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6211786U Pending JPS62174225U (en) | 1986-04-24 | 1986-04-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62174225U (en) |
-
1986
- 1986-04-24 JP JP6211786U patent/JPS62174225U/ja active Pending
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