GB1510653A - Device for monitoring gases - Google Patents
Device for monitoring gasesInfo
- Publication number
- GB1510653A GB1510653A GB1930275A GB1930275A GB1510653A GB 1510653 A GB1510653 A GB 1510653A GB 1930275 A GB1930275 A GB 1930275A GB 1930275 A GB1930275 A GB 1930275A GB 1510653 A GB1510653 A GB 1510653A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wire
- resistance
- current
- content
- change
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
- F02D41/1455—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with sensor resistivity varying with oxygen concentration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/16—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
1510653 Gas analysis ROBERT BOSCH GmbH 8 May 1975 [6 Dec 1974] 19302/75 Heading G1N The combustible component content in a gas mixture is measured by the change in temperature and resistance of a heated wire located in the gas mixture. As shown, Fig. 4, the wire 10 is connected in a bridge network and fed with current via transistor 30 sufficient to heat it to cause combustion of oxidizable gas components. Unbalance of the bridge network produced by the resulting change in temperature and resistance of wire 10 is amplified at 24 to produce a corresponding change in the collector emitter current of transistor 26, which is measured at 25 and changes the voltage to one input of differential amplifier 37 whose other input is a reference voltage. The amplifier output alters the current supplied by transistor 30 to effectively restore the resistance and temperature of wire 10 to its normal value. The current through wire 10 is periodically increased to burn off any crust that may be formed on its surface. The wire 10 may alternatively be fed with constant current and its resistance change measured directly. The above may be combined with an infrared analyzer measuring the CO content of the gas mixture, which is subtracted from the total combustible content to determine the hydrocarbon content.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742457650 DE2457650A1 (en) | 1974-12-06 | 1974-12-06 | DEVICE FOR CHECKING GASES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1510653A true GB1510653A (en) | 1978-05-10 |
Family
ID=5932652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1930275A Expired GB1510653A (en) | 1974-12-06 | 1975-05-08 | Device for monitoring gases |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE2457650A1 (en) |
| FR (1) | FR2293711A1 (en) |
| GB (1) | GB1510653A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2224122A (en) * | 1988-10-19 | 1990-04-25 | Mine Safety Appliances Co | Catalytic gas detector restoring circuit |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1592506A (en) * | 1976-12-15 | 1981-07-08 | Consolidation Coal Co | Electrical circuitry for detecting a combustible mixture of gas in a mine atmosphere |
| DE2750050C2 (en) * | 1977-11-09 | 1983-12-08 | Robert Bosch Gmbh, 7000 Stuttgart | Device for air volume measurement |
| DE2900690A1 (en) * | 1979-01-10 | 1980-07-24 | Bosch Gmbh Robert | DEVICE FOR TEMPERATURE CONTROL OF A MEASURING PURPOSE OF RESISTANCE, ESPECIALLY IN COMBUSTION ENGINES |
| DE2927378A1 (en) * | 1979-07-06 | 1981-01-29 | Bosch Gmbh Robert | DEVICE FOR BURNING A RESISTANCE TO MEASURE |
| DE3022685A1 (en) * | 1980-06-18 | 1982-01-07 | Robert Bosch Gmbh, 7000 Stuttgart | DEVICE FOR FLOW MEASUREMENT IN AN INTERNAL COMBUSTION ENGINE |
| EP0096514A3 (en) * | 1982-06-05 | 1984-10-31 | Bl Technology Limited | Detecting combustible or combustion-supporting constituents in exhaust gas from an internal combustion engine |
| GB8319414D0 (en) * | 1983-07-19 | 1983-08-17 | Bl Tech Ltd | Detecting combustion-supporting constituents in exhaust gas |
-
1974
- 1974-12-06 DE DE19742457650 patent/DE2457650A1/en active Pending
-
1975
- 1975-05-08 GB GB1930275A patent/GB1510653A/en not_active Expired
- 1975-11-17 FR FR7535039A patent/FR2293711A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2224122A (en) * | 1988-10-19 | 1990-04-25 | Mine Safety Appliances Co | Catalytic gas detector restoring circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2457650A1 (en) | 1976-06-10 |
| FR2293711A1 (en) | 1976-07-02 |
| FR2293711B3 (en) | 1978-08-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |