JPH01140148U - - Google Patents
Info
- Publication number
- JPH01140148U JPH01140148U JP1988035162U JP3516288U JPH01140148U JP H01140148 U JPH01140148 U JP H01140148U JP 1988035162 U JP1988035162 U JP 1988035162U JP 3516288 U JP3516288 U JP 3516288U JP H01140148 U JPH01140148 U JP H01140148U
- Authority
- JP
- Japan
- Prior art keywords
- failure detection
- comparator
- detection circuit
- current
- output
- 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
- 238000001514 detection method Methods 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Description
第１図はこの考案の一実施例による筒内圧セン
サの故障検出装置の構成図、第２図は第１図の各
部の動作波形図、第３図は圧電形筒内圧センサの
断面構造図、第４図は圧電形筒内圧センサの取り
付け図、第５図は従来の圧電形筒内圧センサの基
本回路図、第６図は第５図の出力波形図である。
図において、１……圧電形筒内圧センサ、２…
…第１のオペアンプ、６……第２のオペアンプ、
９……比較器、１０……故障検出回路である。な
お、各図中同一符号は同一又は相当部分を示す。
FIG. 1 is a configuration diagram of a failure detection device for a cylinder pressure sensor according to an embodiment of the invention, FIG. 2 is an operation waveform diagram of each part of FIG. 1, and FIG. 3 is a cross-sectional structural diagram of a piezoelectric cylinder pressure sensor. FIG. 4 is an installation diagram of a piezoelectric cylinder pressure sensor, FIG. 5 is a basic circuit diagram of a conventional piezoelectric cylinder pressure sensor, and FIG. 6 is an output waveform diagram of FIG. 5. In the figure, 1...piezoelectric cylinder pressure sensor, 2...
...first operational amplifier, 6...second operational amplifier,
9...Comparator, 10...Failure detection circuit. Note that the same reference numerals in each figure indicate the same or equivalent parts.
Claims (1)
圧力検出器と、この圧電形圧力検出器の出力電流
信号を電圧信号に変換する電流―電圧変換器と、
この電流―電圧変換器の出力信号を積分する積分
器と、この積分器からの出力信号と所定の基準レ
ベルと比較される比較器と、この比較器からの出
力パルスを検出する故障検出回路とを備え、この
故障検出回路が前記比較器からの出力パルスを検
出しない場合は、前記圧電形圧力検出器が故障で
あると判定することを特徴とする筒内圧センサの
故障検出装置。 a piezoelectric pressure detector that detects pressure in a combustion cylinder of an internal combustion engine; a current-voltage converter that converts an output current signal of the piezoelectric pressure detector into a voltage signal;
An integrator that integrates the output signal of this current-voltage converter, a comparator that compares the output signal from this integrator with a predetermined reference level, and a failure detection circuit that detects the output pulse from this comparator. A failure detection device for a cylinder pressure sensor, characterized in that the failure detection circuit determines that the piezoelectric pressure detector is in failure if the failure detection circuit does not detect an output pulse from the comparator.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988035162U JPH01140148U (en) | 1988-03-18 | 1988-03-18 | |
| KR1019890001746A KR920006455B1 (en) | 1988-02-22 | 1989-02-15 | Cylinder pressure detecting apparatus |
| DE3905824A DE3905824A1 (en) | 1988-02-22 | 1989-02-22 | Device for detecting the pressure in a cylinder of an internal combustion engine |
| US07/503,072 US5062294A (en) | 1988-02-22 | 1990-03-29 | Apparatus for detecting pressure in cylinder of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988035162U JPH01140148U (en) | 1988-03-18 | 1988-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01140148U true JPH01140148U (en) | 1989-09-26 |
Family
ID=31261815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988035162U Pending JPH01140148U (en) | 1988-02-22 | 1988-03-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01140148U (en) |
-
1988
- 1988-03-18 JP JP1988035162U patent/JPH01140148U/ja active Pending
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