Patent US3995604A successfully refreshed from Google Patents.
US3995604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark ignited internal combustion engine operated with charge stratification
Assignee: Volkswagen AG
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Filing: 1975-02-25
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Granted: 1976-12-07
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Expires: 1995-02-25
Abstract
Abstract An internal combustion engine of the type operated with charge stratification is disclosed. The engine comprises a main combustion chamber and an auxiliary combustion chamber (prechamber), the main chamber and prechamber being interconnected by a short passage. The engine is supplied with fuel from a closed fuel system having a filter for adsorption of gaseous fuel components. An auxiliary intake line connects the prechamber with the adsorption filter such that the filter operates in the desorption direction as gases are drawn into the prechamber from the filter.
Inventors
- 👤 Walter Brandstetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:22
CPC Classifications
F; F02; F02B; F02B19/00; F02B19/10; F02B19/1019; F02B19/108; F02B19/1023; F02B19/1028; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
A spark ignited internal combustion engine operated with charge stratification, comprising, in combination: a main combustion chamber and an auxiliary combustion chamber, said main and said auxiliary chambers being interconnected by means of a connecting passage; a closed fuel system having filter means for adsorbing gaseous components; means, connected to said fuel system, for supplying fuel to said main chamber; means, connected to said fuel system, for supplying fuel to said auxiliary chamber and providing a combustable fuel-air-mixture in said auxiliary chamber, said fuel-air-mixture being richer than the fuel-air-mixture in said main chamber; means for igniting the fuel-air-mixture in said auxiliary chamber; and an auxiliary intake line opening into said auxiliary chamber and connected with said filter means such that said filter means operates in the desorption direction as gases are drawn into said auxiliary chamber from said filter means.
Claim 2
Dependent Claim
140 words
A spark ignited internal combustion engine operated with charge stratification, comprising, in combination: a main combustion chamber and an auxiliary combustion chamber, said main and said auxiliary chambers being interconnected by means of a connecting passage; a closed fuel system having filter means for adsorbing gaseous components; means, connected to said fuel system, for supplying fuel to said main chamber; means, connected to said fuel system, for supplying fuel to said auxiliary chamber and providing a combustable fuel-air-mixture in said auxiliary chamber, said fuel-air-mixture being richer than the fuel-air-mixture in said main chamber; means for igniting the fuel-air-mixture in said auxiliary chamber; and an auxiliary intake line opening into said auxiliary chamber and connected with said filter means such that said filter means operates in the desorption direction as gases are drawn into said auxiliary chamber from said filter means.
Claim 3
Dependent Claim
22 words
The internal combustion engine defined in claim 1, further comprising an automatically controlled auxiliary intake valve arranged in said auxiliary intake line.
Claim 4
Dependent Claim
17 words
The internal combustion engine defined in claim 2, wherein said auxiliary intake valve is a check valve.
Claim 5
Dependent Claim
16 words
The internal combustion engine defined in claim 2, wherein said auxiliary intake valve is mechanically actuated.
Claim 6
Dependent Claim
47 words
The internal combustion engine defined in claim 2, wherein said means for supplying fuel to said auxiliary chamber comprises a fuel-injection nozzle opening into said auxiliary chamber, whereby said auxiliary intake valve is provided for scavenging, from said auxiliary chamber, the exhaust gas residues produced during combustion.
Claim 7
Dependent Claim
34 words
The internal combustion engine defined in claim 5, wherein said auxiliary intake line includes switch valve means for closing the communication with said filter means and opening said auxiliary intake line to the atmosphere.
Claim 8
Dependent Claim
56 words
The internal combustion engine defined in claim 1, wherein said means for supplying fuel to said auxiliary chamber includes an auxiliary mixture formation device, connected to said auxiliary intake line, for providing a rich fuel-air mixture, whereby gases are supplied to said auxiliary intake line from both said filter means and said auxiliary mixture formation device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |