JPH0520980Y2 - - Google Patents
Info
- Publication number
- JPH0520980Y2 JPH0520980Y2 JP1986145840U JP14584086U JPH0520980Y2 JP H0520980 Y2 JPH0520980 Y2 JP H0520980Y2 JP 1986145840 U JP1986145840 U JP 1986145840U JP 14584086 U JP14584086 U JP 14584086U JP H0520980 Y2 JPH0520980 Y2 JP H0520980Y2
- Authority
- JP
- Japan
- Prior art keywords
- hot wire
- voltage
- resistor
- temperature
- transistor
- 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.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 description 11
- 239000003990 capacitor Substances 0.000 description 8
- 230000006866 deterioration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Description
【考案の詳細な説明】
＜産業上の利用分野＞
本考案は内燃機関における熱線流量計の付着物
焼切装置に関する。[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a device for burning out deposits on a hot wire flow meter in an internal combustion engine.
＜従来の技術＞
例えば自動車用内燃機関においては、吸気通路
に介装された吸入空気流量を測定する熱線流量計
の熱線抵抗に付着する塵埃等の付着物を焼切り流
量検出精度の低下を防止する装置を備えたものが
ある。かかる従来例を第３図に示す（実開昭58−
127320号公報参照）。<Prior art> For example, in internal combustion engines for automobiles, deposits such as dust adhering to the hot wire resistance of a hot wire flow meter installed in the intake passage that measures the intake air flow rate are burned off to prevent a decrease in flow rate detection accuracy. There are some that are equipped with a device to do this. Such a conventional example is shown in FIG.
(See Publication No. 127320).
すなわち、機関の吸気通路中に配設される白金
等の熱線抵抗１と該熱線抵抗１と略同一雰囲気に
配設される温度補償抵抗２と第１基準抵抗３と第
２基準抵抗４と出力抵抗５とによりブリツジ回路
が構成され、このブリツジ回路への供給電流は、
ａ点とｂ点との電位を入力する差動増幅器６及び
パワートランジスタ７により吸入空気流量の変化
に応じて制御される。例えば吸入空気流量すなわ
ち吸入空気流速が増大すれば熱線抵抗１の冷却度
が増大しその抵抗値が減少しようとするが、この
時点ではａ点の電位が増大して差動増幅器６の出
力が減少する。これによりパワートランジスタ７
のコレクタ電流が増大してブリツジ回路へのバツ
テリ等の電源UBからの供給電流が増大するため
熱線抵抗１の発熱量を増大することができその抵
抗値を一定に保つように制御される。したがつて
例えば出力抵抗５の出力電圧UBから吸入空気流
量を読取ることができる。 That is, a hot wire resistor 1 made of platinum or the like disposed in the intake passage of the engine, a temperature compensation resistor 2 disposed in substantially the same atmosphere as the hot wire resistor 1, a first reference resistor 3, a second reference resistor 4, and an output. A bridge circuit is constituted by the resistor 5, and the current supplied to this bridge circuit is as follows:
It is controlled according to changes in the intake air flow rate by a differential amplifier 6 and a power transistor 7 which input the potentials at points a and b. For example, if the intake air flow rate, that is, the intake air flow rate increases, the degree of cooling of the hot wire resistor 1 increases and its resistance value tends to decrease, but at this point, the potential at point a increases and the output of the differential amplifier 6 decreases. do. As a result, the power transistor 7
As the collector current increases, the current supplied to the bridge circuit from the power source U B such as a battery increases, so the amount of heat generated by the hot wire resistor 1 can be increased, and the resistance value is controlled to be kept constant. Therefore, for example, the intake air flow rate can be read from the output voltage U B of the output resistor 5.
また、焼切回路としては、差動増幅器６の＋側
入力端子に第１電流制限抵抗８を介して焼切用ト
ランジスタ９を接続し、この焼切用トランジスタ
９に第２電流制限抵抗１０を介して制御装置から
一定時間“Ｈ”レベルの焼切信号を入力し焼切用
トランジスタ９をオンさせるようになつている。 Further, as a burnout circuit, a burnout transistor 9 is connected to the + side input terminal of the differential amplifier 6 via a first current limiting resistor 8, and a second current limiting resistor 10 is connected to the burnout transistor 9. A burnout signal of "H" level is inputted from the control device for a certain period of time to turn on the burnout transistor 9.
かかる焼切回路の動作の詳細を説明すると、焼
切用トランジスタ９が焼切信号によりオンされた
直後は第１電流制限抵抗８及び焼切用トランジス
タ９を介して接地されるからｂ点の電位が低下す
る。したがつて、差動増幅器６の出力が大巾に低
下しパワートランジスタ７が導通してブリツジ回
路に電源UBが電圧が印加される。これにより、
熱線抵抗１に大電流が流れて熱線抵抗１が発熱し
その温度が徐々に上昇する。この温度上昇に伴つ
てその抵抗値が徐々に上昇するとこれに伴つてａ
点の電位も徐々に減少する。そして、ａ点の電位
がｂ点の電位まで低下すると、差動増幅器６によ
る有効な制御が開始され熱線抵抗１の温度を例え
ば1000℃に保つように制御される。 To explain the details of the operation of such a burnout circuit, immediately after the burnout transistor 9 is turned on by the burnout signal, it is grounded via the first current limiting resistor 8 and the burnout transistor 9, so that the potential at point b is decreases. Therefore, the output of the differential amplifier 6 is greatly reduced, the power transistor 7 is turned on, and the voltage from the power source U B is applied to the bridge circuit. This results in
A large current flows through the hot wire resistor 1, the hot wire resistor 1 generates heat, and its temperature gradually rises. When the resistance value gradually increases with this temperature rise, a
The potential at the point also gradually decreases. Then, when the potential at point a drops to the potential at point b, effective control by the differential amplifier 6 is started and the temperature of the hot wire resistor 1 is controlled to be maintained at, for example, 1000°C.
これにより、熱線抵抗１の不着物を焼切るよう
にしている。 In this way, the undesired matter with a hot wire resistance of 1 is burned off.
尚、１１は第３電流制限抵抗、１２はパワート
ランジスタ７の動作安定化用抵抗である。 Note that 11 is a third current limiting resistor, and 12 is a resistor for stabilizing the operation of the power transistor 7.
＜考案が解決しようとする問題点＞
しかしながら、このような従来の熱線流量計の
付着物焼切装置においては、熱線抵抗１に焼切用
の大電流を供給して熱線抵抗１の温度を第４図に
示すように目標温度に保つように制御している
が、回路の制御応答遅れにより目標温度になる直
前に第４図Ａに示すように熱線抵抗１の温度が瞬
時的に前記目標温度を越えるため、熱線抵抗１の
熱劣化を招き検出精度の低下を招くという不具合
があつた。<Problems to be solved by the invention> However, in such a conventional device for burning out deposits on a hot wire flowmeter, a large current for burning out is supplied to the hot wire resistor 1 to increase the temperature of the hot wire resistor 1. As shown in Figure 4, the temperature is controlled to be maintained at the target temperature, but due to a delay in the control response of the circuit, the temperature of the hot wire resistor 1 instantaneously drops to the target temperature, as shown in Figure 4A, just before the target temperature is reached. Therefore, there was a problem that thermal deterioration of the hot wire resistor 1 was caused, leading to a decrease in detection accuracy.
本考案は、このような実状に鑑みてなされたも
ので、熱線抵抗の付着物焼切を可能にしつつ熱線
抵抗の劣化を抑制できる熱線流量計の付着物焼切
装置を提供することを目的とする。 The present invention was developed in view of the above-mentioned circumstances, and the purpose of the present invention is to provide a device for burning off deposits on a hot wire flowmeter that can suppress the deterioration of the hot wire resistance while making it possible to burn off deposits on the hot wire resistance. do.
＜問題点を解決するための手段＞
このため、本考案は熱線抵抗に印加される電圧
を検出する電圧検出手段と、検出された電圧と前
記熱線抵抗の温度上昇を抑制すべく設定された所
定電圧とを比較する比較手段と、該比較結果に応
じて熱線抵抗に印加される電圧を前記所定電圧に
保持するように制御する制御手段と、を備えるよ
うにした。<Means for Solving the Problems> For this reason, the present invention includes a voltage detection means for detecting the voltage applied to the hot wire resistance, and a predetermined voltage detection means set to suppress the detected voltage and the temperature rise of the hot wire resistance. The present invention is provided with a comparison means for comparing the voltage and a control means for controlling the voltage applied to the hot wire resistor to be maintained at the predetermined voltage according to the comparison result.
＜作用＞
このようにして、焼切信号入力初期に熱線抵抗
に印加される電圧を抑制することにより熱線抵抗
温の温度上昇を抑制し、もつて熱線抵抗の温度が
目標温度を越えるのを抑制するようにした。<Function> In this way, by suppressing the voltage applied to the hot wire resistance at the initial stage of inputting the burnout signal, the rise in temperature of the hot wire resistance is suppressed, thereby preventing the temperature of the hot wire resistance from exceeding the target temperature. I decided to do so.
＜実施例＞
以下に、本考案の一実施例を第１図及び第２図
に基づいて説明する。尚、従来例と同一要素には
第３図と同一符号を付して説明を省略する。<Example> An example of the present invention will be described below with reference to FIGS. 1 and 2. Incidentally, the same elements as those in the conventional example are given the same reference numerals as in FIG. 3, and the explanation thereof will be omitted.
第１図において、パワートランジスタ７のコレ
クタ電圧が充放電用抵抗２１を介して電圧検出手
段としてのコンデンサ２２に印加され、コンデン
サ２２の充電圧は比較手段としての比較器２３の
非反転側端子に印加されている。 In FIG. 1, the collector voltage of a power transistor 7 is applied to a capacitor 22 as a voltage detection means via a charging/discharging resistor 21, and the charging voltage of the capacitor 22 is applied to a non-inverting terminal of a comparator 23 as a comparing means. is being applied.
ここで、充放電用抵抗２１とコンデンサ２２か
ら定められる時定数は極めて小さく設定されてい
る。 Here, the time constant determined by the charging/discharging resistor 21 and the capacitor 22 is set to be extremely small.
前記比較器２３の反転側端子にはツエナダイオ
ード２４のカソード電圧Vrefが印加され、ツエ
ナダイオード２４の端子には抵抗２５を介して電
源UB電圧が印加されている。 A cathode voltage Vref of a Zener diode 24 is applied to the inverting terminal of the comparator 23, and a power supply voltage U B is applied to a terminal of the Zener diode 24 via a resistor 25.
ここで、前記カソード電圧Vrefは熱線抵抗１
の温度上昇を抑制する値に設定されている。 Here, the cathode voltage Vref is the hot wire resistance 1
is set to a value that suppresses the temperature rise.
前記比較器２３の出力電圧は第３電流制限抵抗
２６を介してエミツタ接地の第１トランジスタ２
７のベース端子に印加され、第１トランジスタ２
７のコレクタ端子は第４電流制限抵抗３１を介し
て第２トランジスタ２８のベース端子に接続され
ている。第２トランジスタ２８のエミツタ端子に
は前記パワートランジスタ７の出力電圧が印加さ
れ、また第２トランジスタ２８のコレクタ電圧は
第５電流制限抵抗２９を介してブリツジ回路のｂ
点に印加されている。 The output voltage of the comparator 23 is applied to the first transistor 2 whose emitter is grounded via the third current limiting resistor 26.
7 to the base terminal of the first transistor 2
The collector terminal of transistor 7 is connected to the base terminal of second transistor 28 via fourth current limiting resistor 31 . The output voltage of the power transistor 7 is applied to the emitter terminal of the second transistor 28, and the collector voltage of the second transistor 28 is applied to the b of the bridge circuit via the fifth current limiting resistor 29.
applied to the point.
ここでは、第１及び第２トランジスタ２７，２
８により制御手段が構成される。 Here, the first and second transistors 27, 2
8 constitutes a control means.
次に作用を第２図を参照しつつ説明する。 Next, the operation will be explained with reference to FIG.
焼切信号が入力され焼切用トランジスタ９がオ
ンされるが、この入力開始時にはコンデンサ２２
の充電圧が低く比較器２３の出力が第２図に示す
ようにＬになつている。したがつて、第１及び第
２トランジスタ２７，２８が共にオフされている
ので、焼切用トランジスタ９のオン動作によりｂ
点の電位が強制的にＬになる。これにより、従来
例と同様に差動増幅器６の出力が大幅に低下し、
パワートランジスタ７が導通してブリツジ回路に
大電圧が印加され熱線抵抗１の温度が第２図に示
すように上昇する。 The burnout signal is input and the burnout transistor 9 is turned on, but when this input starts, the capacitor 22
The charging voltage is low, and the output of the comparator 23 becomes L as shown in FIG. Therefore, since both the first and second transistors 27 and 28 are turned off, b
The potential at the point is forced to L. As a result, the output of the differential amplifier 6 is significantly reduced as in the conventional example,
The power transistor 7 becomes conductive, a large voltage is applied to the bridge circuit, and the temperature of the hot wire resistor 1 rises as shown in FIG.
そして、充電によりコンデンサ２２の充電圧が
ツエナダイオード２４のカソード電圧まで上昇す
ると、比較器２３の出力が第２図に示すようにＨ
となり、第１及び第２トランジスタ２７，２８が
共にオンされる。したがつて、前記第２トランジ
スタ２８、第５電流制限抵抗２９を介して第１電
流制限抵抗８、焼切用トランジスタ９に通電され
ブリツジ回路のｂ点の電位が高くなる。これによ
り、差動増幅器６の出力が高くなるため、パワー
トランジスタ７からブリツジ回路に印加される電
圧が低下すると共にコンデンサ２２の充電圧も低
下する。 When the charging voltage of the capacitor 22 rises to the cathode voltage of the Zener diode 24 due to charging, the output of the comparator 23 becomes H as shown in FIG.
Therefore, both the first and second transistors 27 and 28 are turned on. Therefore, the first current limiting resistor 8 and the burnout transistor 9 are energized via the second transistor 28 and the fifth current limiting resistor 29, and the potential at point b of the bridge circuit becomes high. As a result, the output of the differential amplifier 6 increases, so that the voltage applied to the bridge circuit from the power transistor 7 decreases, and the charging voltage of the capacitor 22 also decreases.
そして、コンデンサ２２の充電圧が前記カソー
ド電圧Vref未満になると比較器２３の出力がＬ
になり第１及び第２トランジスタ２７，２８が共
にオンされる。これにより、焼切信号入力開始時
と同様にブリツジ回路のｂ点の電位が強制的にＬ
となりブリツジ回路に大電圧が印加され熱線抵抗
１の温度が上昇する。 Then, when the charging voltage of the capacitor 22 becomes less than the cathode voltage Vref, the output of the comparator 23 becomes L.
Then, both the first and second transistors 27 and 28 are turned on. As a result, the potential at point b of the bridge circuit is forced to go low, similar to when inputting the burnout signal started.
As a result, a large voltage is applied to the bridge circuit, and the temperature of the hot wire resistor 1 rises.
このようにして、ブリツジ回路に印加される電
圧がカソード電圧Vrefになるように比較器２３
により第１及び第２トランジスタ２７，２８をオ
ン・オフ制御し、熱線抵抗１の温度を第２図に示
すようにオン・オフ的でかつ徐々に上昇させて目
標温度に近づける。かかる温度上昇に伴つてその
抵抗値が徐々に上昇しこれに伴つてａ点の電位も
徐々に減少する。そして、ａ点の電位がｂ点の電
位まで低下すると差動増幅器６による有効な制御
が開始され熱線抵抗１の温度を目標温度（例えば
1000℃）に保つように制御される。 In this way, the comparator 23 is configured so that the voltage applied to the bridge circuit becomes the cathode voltage Vref.
The first and second transistors 27 and 28 are controlled on and off, and the temperature of the hot wire resistor 1 is gradually increased in an on-off manner as shown in FIG. 2 to approach the target temperature. As the temperature rises, the resistance value gradually increases, and the potential at point a also gradually decreases. Then, when the potential at point a decreases to the potential at point b, effective control by the differential amplifier 6 is started, and the temperature of the hot wire resistor 1 is lowered to a target temperature (for example,
1000℃).
以上説明したように、ブリツジ回路すなわち熱
線抵抗１に印加される電圧がカソード電圧Vref
になるようにブリツジ回路への印加電圧を制御し
熱線抵抗１の温度上昇を抑制しつつ目標温度に近
づけるようにしたため、目標温度になる直前に熱
線抵抗１の温度が目標温度を越えるのを最小限に
抑制できる。このため、熱線抵抗１の熱劣化を抑
制できる。 As explained above, the voltage applied to the bridge circuit, that is, the hot wire resistor 1 is the cathode voltage Vref
By controlling the voltage applied to the bridge circuit so that the temperature of the hot wire resistor 1 approaches the target temperature while suppressing the temperature rise, the temperature of the hot wire resistor 1 can be minimized to prevent the temperature of the hot wire resistor 1 from exceeding the target temperature just before reaching the target temperature. can be suppressed to a minimum. Therefore, thermal deterioration of the hot wire resistor 1 can be suppressed.
＜考案の効果＞
本考案は、以上説明したように、焼切信号入力
時に熱線抵抗の温度上昇を抑制するように熱線抵
抗への印加電圧を制御したので、熱線抵抗の温度
が目標温度を越えるのを抑制できるため熱線抵抗
の熱劣化を抑制できもつて検出精度の低下を抑制
できる。<Effects of the invention> As explained above, the present invention controls the voltage applied to the hot wire resistor so as to suppress the temperature rise of the hot wire resistor when the burnout signal is input, so that the temperature of the hot wire resistor exceeds the target temperature. Therefore, thermal deterioration of the hot wire resistance can be suppressed, and a decrease in detection accuracy can be suppressed.
第１図は本考案の一実施例を示す回路図、第２
図は同上の作用を説明するための図、第３図は熱
線流量計の付着物焼切装置の従来例を示す回路
図、第４図は同上の熱線抵抗の温度の変化を示す
図である。
１……熱線抵抗、６……差動増幅器、９……焼
切用トランジスタ、２２……コンデンサ、２３…
…比較器、２４……ツエナダイオード、２７……
第１トランジスタ、２８……第２トランジスタ。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a diagram for explaining the action of the above, Figure 3 is a circuit diagram showing a conventional example of a deposit burning device for a hot wire flow meter, and Figure 4 is a diagram showing changes in temperature of the hot wire resistance same as the above. . DESCRIPTION OF SYMBOLS 1... Hot wire resistance, 6... Differential amplifier, 9... Transistor for burnout, 22... Capacitor, 23...
...Comparator, 24...Zena diode, 27...
First transistor, 28... second transistor.
Claims (1)
信号に基づき該焼切信号入力初期に大電圧を、印
加し熱線抵抗の温度を上昇させた後、熱線抵抗の
温度を目標温度に保つべく熱線抵抗への印加電圧
を制御し熱線抵抗の付着物を焼切る熱線流量計の
付着物焼切装置において、前記熱線抵抗に印加さ
れる電圧を検出する電圧検出手段と、検出された
電圧と前記熱線抵抗の温度上昇を抑制すべく設定
された所定電圧とを比較する比較手段と、該比較
結果に応じて熱線抵抗に印加される電圧を前記所
定電圧に保持するように制御する制御手段と、を
備えてなる内燃機関における熱線流量計の付着物
焼切装置。 Based on the burnout signal, a large voltage is applied to the hot wire resistor installed in the intake passage of the engine at the initial stage of inputting the burnout signal to increase the temperature of the hot wire resistor, and then maintain the temperature of the hot wire resistor at the target temperature. A deposit burning device for a hot wire flowmeter that burns off deposits on the hot wire resistance by controlling the voltage applied to the hot wire resistance, comprising: a voltage detection means for detecting the voltage applied to the hot wire resistance; a comparison means for comparing the voltage with a predetermined voltage set to suppress a temperature rise of the hot wire resistance; and a control means for controlling the voltage applied to the hot wire resistance to be maintained at the predetermined voltage according to the comparison result. A device for burning out deposits on a hot wire flow meter in an internal combustion engine, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986145840U JPH0520980Y2 (en) | 1986-09-25 | 1986-09-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986145840U JPH0520980Y2 (en) | 1986-09-25 | 1986-09-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6354029U JPS6354029U (en) | 1988-04-11 |
| JPH0520980Y2 true JPH0520980Y2 (en) | 1993-05-31 |
Family
ID=31057739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986145840U Expired - Lifetime JPH0520980Y2 (en) | 1986-09-25 | 1986-09-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0520980Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58153119A (en) * | 1982-03-02 | 1983-09-12 | ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Controller for measuring sensor of quantity of air of internal combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5942699Y2 (en) * | 1979-02-28 | 1984-12-14 | 日本電子機器株式会社 | Power control circuit for hot wire current meter |
-
1986
- 1986-09-25 JP JP1986145840U patent/JPH0520980Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58153119A (en) * | 1982-03-02 | 1983-09-12 | ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Controller for measuring sensor of quantity of air of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6354029U (en) | 1988-04-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2682348B2 (en) | Air flow meter and air flow detection method | |
| KR930001729B1 (en) | Hot-wire flow rate measuring apparatus | |
| JP2749714B2 (en) | Ignition device for internal combustion engine | |
| US4332165A (en) | Gas flow measuring device | |
| JPS6140924B2 (en) | ||
| US4384484A (en) | Gas flow measuring device | |
| JPH0520980Y2 (en) | ||
| US4437345A (en) | Gas flow measuring device | |
| US4762604A (en) | Oxygen concentration sensing apparatus | |
| JPH0566268U (en) | Ignition device for internal combustion engine | |
| US4571991A (en) | Air flow measuring apparatus | |
| JPH0233966B2 (en) | ||
| US4275590A (en) | Gas flow measuring apparatus | |
| JPS61294355A (en) | Oxygen concentration detector | |
| JPS6048518A (en) | Heater temperature control circuit for air fuel ratio sensor | |
| JPH01174987A (en) | Detection system for disconnection of heating element | |
| JPS6228709Y2 (en) | ||
| JPH0518665Y2 (en) | ||
| JPH0143883B2 (en) | ||
| JPS62235527A (en) | Attachment burn-off apparatus for hot-wire flowmeter in internal combustion engine for automobile | |
| JPS59168264A (en) | Ignition device for internal-combustion engine | |
| JP2857491B2 (en) | Hot wire air flow meter | |
| JPH0633376Y2 (en) | Hot wire flow meter for internal combustion engine | |
| JPS6130718A (en) | Hot-wire type flow meter | |
| JP3019039B2 (en) | Internal combustion engine ignition device |