JPS56129740A - Air-fuel ratio controlling system - Google Patents
Air-fuel ratio controlling systemInfo
- Publication number
- JPS56129740A JPS56129740A JP3364080A JP3364080A JPS56129740A JP S56129740 A JPS56129740 A JP S56129740A JP 3364080 A JP3364080 A JP 3364080A JP 3364080 A JP3364080 A JP 3364080A JP S56129740 A JPS56129740 A JP S56129740A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- signal
- fuel ratio
- comparator
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title abstract 3
- 230000008878 coupling Effects 0.000 abstract 3
- 238000010168 coupling process Methods 0.000 abstract 3
- 238000005859 coupling reaction Methods 0.000 abstract 3
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
PURPOSE: To simplify the structure of an arithemetic circuit used in an air-fuel ratio controlling system, by providing an AC coupling circuit for removing DC component from the output signal of an exhaust-gas sensor and taking out its fluctuating component, and controlling the air-fuel ratio by the result of comparison between the output of said AC coupling circuit and a reference level.
CONSTITUTION: When an engine is set into operation and an exhaust-gas sensor 8 is fully activated, an output signal fluctuating in a wide range of voltage is produced from the sensor 8, so that an amplified signal A shown in the latter half of wave form (a) is produced at the output terminal of an amplifier 91 in a control circuit 9. The signal A is converted into a signal B by an AC coupling capacitor 92a in a comparison circuit 92, and a comparator 92f produces an output shown by wave form (c) in the drawing by compensating the setting level in response to the signal B. The output signal of the comparator 92f is afforded via an integration circuit 93a to a comparator 93c in a modulating circuit 93, in which it is compared with the output of a triangular-wave generator 93b. Here, the output of the modulating circuit 93 serves to drive a vacuum control valve 10 at about 30Hz by a driving circuit 94, for effecting intermittent control of a control valve disposed in a passage by- passing a carburetor.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3364080A JPS56129740A (en) | 1980-03-17 | 1980-03-17 | Air-fuel ratio controlling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3364080A JPS56129740A (en) | 1980-03-17 | 1980-03-17 | Air-fuel ratio controlling system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56129740A true JPS56129740A (en) | 1981-10-12 |
| JPS6130137B2 JPS6130137B2 (en) | 1986-07-11 |
Family
ID=12392040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3364080A Granted JPS56129740A (en) | 1980-03-17 | 1980-03-17 | Air-fuel ratio controlling system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56129740A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56149614U (en) * | 1980-04-11 | 1981-11-10 | ||
| JPS6133934U (en) * | 1984-07-31 | 1986-03-01 | 富士重工業株式会社 | Air fuel ratio control device |
-
1980
- 1980-03-17 JP JP3364080A patent/JPS56129740A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56149614U (en) * | 1980-04-11 | 1981-11-10 | ||
| JPS6133934U (en) * | 1984-07-31 | 1986-03-01 | 富士重工業株式会社 | Air fuel ratio control device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6130137B2 (en) | 1986-07-11 |
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