GB1569948A - Internal combustion engine havng air/fuel ratio control means - Google Patents
Internal combustion engine havng air/fuel ratio control means Download PDFInfo
- Publication number
- GB1569948A GB1569948A GB4623/77A GB462377A GB1569948A GB 1569948 A GB1569948 A GB 1569948A GB 4623/77 A GB4623/77 A GB 4623/77A GB 462377 A GB462377 A GB 462377A GB 1569948 A GB1569948 A GB 1569948A
- Authority
- GB
- United Kingdom
- Prior art keywords
- internal combustion
- exhaust
- combustion engine
- duct means
- oxygen sensor
- 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
- 238000002485 combustion reaction Methods 0.000 title claims description 17
- 239000000446 fuel Substances 0.000 title claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 18
- 229910052760 oxygen Inorganic materials 0.000 claims description 18
- 239000003054 catalyst Substances 0.000 claims description 12
- 239000000523 sample Substances 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 239000002574 poison Substances 0.000 claims description 2
- 231100000614 poison Toxicity 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
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
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Description
(54) INTERNAL COMBUSTION ENGINE HAVING
AIR/FUEL RATIO CONTROL MEANS
(71) We, BL Cs LIMITED (formerly
BRITISH LEYLAND UK LIMITED), a British
Company of Leyland House, 174 Marylebone Road, London NW1 5AA, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to internal combustion engines.
It is known to provide internal combustion engines that include a three-way catalyst in the exhaust system with an oxygen sensor disposed in the exhaust system and connected to a controller which varies the air/fuel ratio so as to maintain the ratio at around stoichiometric.
Whilst engines that incorporate a threeway catalyst should be run on lead-free fuel, it has been found that the commercially available lead-free fuels may contain sufficient traces of lead to poison the known oxygen sensors after 15,000 to 20,000 miles.
According to this invention an internal combustion engine incorporating an oxygen sensor connected to means for varying the fuel/air ratio, has duct means interconnected with the exhaust system such that only a small proportion of the exhaust gases pass through the duct means, and has the oxygen sensor disposed in the duct means downstream of a lead trap.
Thus it will be understood that not only will the lead trap protect the oxygen sensor, but that the lead trap may be relatively small because it will be subject to only a small proportion of the exhaust gases.
An engine according to the invention may also be provided with a three-way catalyst system, in which case the means for varying the fuel/air ratio should be such as to provide a ratio of around stoichiometric as is required with such systems.
The duct means may comprise a probe inserted into the exhaust system in a location where it can collect a representative sample of the exhaust gases; and, furthermore, the duct means may be arranged to return the exhaust gases that flow therethrough into the exhaust system.
An example of the invention is illustrated diagramatically in the accompanying drawing which is a diagramatic illustration of an engine according to the invention.
The engine 11 has a conventional inlet manifold 12 and a conventional exhaust manifold 13.
The exhaust manifold 13 is connected to an exhaust pipe 14 fitted with a three-way catalyst 15.
A probe 16 sized to collect approximately 10 to 20% of the exhaust gases and located so that the gases collected by the probe are representative of the total exhaust gases is fitted in the exhaust manifold 14 and is connected by a by-pass pipe 17 incorporating an alumina coated wire gauze lead trap 18 and an oxygen sensor 19 back to the main exhaust pipe 14 upstream of the threeway catalyst 15 as shown in the drawing.
The oxygen sensor 19 is connected to a conventional air fuel ratio controller 20 in known manner.
WHAT WE CLAIM IS:
1. An internal combustion engine incorporating an oxygen sensor connected to means for varying the fuel/air ratio, having duct means interconnected with the exhaust system such that only a small proportion of the exhaust gases pass through the duct means, and having the oxygen sensor disposed in the duct means downstream of a lead trap.
2. An internal combustion engine as claimed in Claim 1 which is also provided with a three-way catalyst system.
3. An internal combustion engine as claimed in Claim 1 or 2 in which the duct means includes a probe adapted to collect
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. An internal combustion engine incorporating an oxygen sensor connected to means for varying the fuel/air ratio, having duct means interconnected with the exhaust system such that only a small proportion of the exhaust gases pass through the duct means, and having the oxygen sensor disposed in the duct means downstream of a lead trap.
2. An internal combustion engine as claimed in Claim 1 which is also provided with a three-way catalyst system.
3. An internal combustion engine as claimed in Claim 1 or 2 in which the duct means includes a probe adapted to collect 10 to 20% of the exhaust gases.
4. An internal combustion engine as claimed in Claim 1, 2 or 3 in which the
duct means is arranged to return the exhaust
gases that flow therethrough into the exhaust
system.
5. An internal combustion engine substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4623/77A GB1569948A (en) | 1978-05-02 | 1978-05-02 | Internal combustion engine havng air/fuel ratio control means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4623/77A GB1569948A (en) | 1978-05-02 | 1978-05-02 | Internal combustion engine havng air/fuel ratio control means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1569948A true GB1569948A (en) | 1980-06-25 |
Family
ID=9780674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4623/77A Expired GB1569948A (en) | 1978-05-02 | 1978-05-02 | Internal combustion engine havng air/fuel ratio control means |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1569948A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2624554A1 (en) * | 1987-12-11 | 1989-06-16 | Outboard Marine Corp | ENGINE EQUIPPED FOR DETECTING AN EXHAUST GAS PARAMETER |
| US5259358A (en) * | 1992-07-14 | 1993-11-09 | Gas Research Institute | Air-fuel ratio control system for catalytic engine exhaust emission control |
| US6135100A (en) * | 1994-05-06 | 2000-10-24 | Sanshin Kogyo Kabushiki Kaisha | Sensor arrangement for engine control system |
| EP1614872A2 (en) * | 2004-07-05 | 2006-01-11 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Multicylinder internal combustion engine |
-
1978
- 1978-05-02 GB GB4623/77A patent/GB1569948A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2624554A1 (en) * | 1987-12-11 | 1989-06-16 | Outboard Marine Corp | ENGINE EQUIPPED FOR DETECTING AN EXHAUST GAS PARAMETER |
| BE1001690A3 (en) * | 1987-12-11 | 1990-02-06 | Outboard Marine Corp | Motor team for detection of a set of exhaust gases. |
| US5259358A (en) * | 1992-07-14 | 1993-11-09 | Gas Research Institute | Air-fuel ratio control system for catalytic engine exhaust emission control |
| US6135100A (en) * | 1994-05-06 | 2000-10-24 | Sanshin Kogyo Kabushiki Kaisha | Sensor arrangement for engine control system |
| EP1614872A2 (en) * | 2004-07-05 | 2006-01-11 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Multicylinder internal combustion engine |
| EP1614872A3 (en) * | 2004-07-05 | 2008-09-03 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Multicylinder internal combustion engine |
| US8015799B2 (en) | 2004-07-05 | 2011-09-13 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Multicylinder internal combustion engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |