Patent US3783849A successfully refreshed from Google Patents.
US3783849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual fuel system
Assignee: Ethyl Corp
•
Filing: 1971-11-05
•
Granted: 1974-01-08
•
Expires: 1991-11-05
Abstract
Abstract A fuel system for a spark ignited internal combustion engine which feeds gasoline and a volatile gasoline fraction to the engine has a volatile fuel generation means with an appropriate valve switching system designed to allow operation of the engine on the volatile fuel during start and warm-up and then switch to normal fuel during warmed-up operation. The self-generation system utilizes engine vacuum as an aid in vaporizing a portion of the normal gasoline.
Inventors
- 👤 T Bramfitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:44
CPC Classifications
F; F02; F02M; F02M13/00; F02M13/06; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
327 words
In a fuel system which feeds gasoline and a volatile gasoline fraction to a spark ignited internal combustion engine during selected periods of engine operation, the improvement comprising a vacuum line connected at one end to a source of engine vacuum, a vaporizing chamber connected by a liquid fuel line to a gasoline tank, a vacuum chamber connected to the other end of said vacuum line, said vacuum chamber comprising a lower section for collecting the condensate and an upper section communicating with said engine vacuum source by said vacuum line whereby the upper section of said vacuum chamber is maintained under vacuum during operation of said fuel system to produce said volatile gasoline fraction, said vacuum chamber having a pervious vaporliquid impingement separator means whereby sid condensate is separated from any uncondensed vapor, a vapor conduit connecting said vaporizing chamber with said vacuum chamber, condensing means in said vapor conduit whereby the vapor produced from said gasoline in said vaporizing chamber is substantially completely condensed, producing a liquid volatile gasoline fraction, a heater in heat exchange relationship with said liquid fuel line whereby said gasoline is heated prior to entering said vaporizing chamber thereby facilitating vaporization, a pressure responsive valve mans connected to said liquid fuel line and downstream of said heater, whereby a portion of said gasoline is vaporized in response to a predetermined pressure drop across said valve from the upstream side of said valve to the downstream side of said valve caused by said engine vacuum, and a volatile fuel storage tank having an inlet connected to said vacuum chamber through pump means and one-way check valve means, an outlet connected by a liquid volatile fuel conduit to the fuel induction means of said engine, pressure relief valve means adapted to open on reaching a predetermined pressure, and pressure regulating valve means in said liquid volatile fuel conduit adapted to deliver liquid volatile fuel to said fuel induction means at a preset pressure.
Claim 2
Dependent Claim
327 words
In a fuel system which feeds gasoline and a volatile gasoline fraction to a spark ignited internal combustion engine during selected periods of engine operation, the improvement comprising a vacuum line connected at one end to a source of engine vacuum, a vaporizing chamber connected by a liquid fuel line to a gasoline tank, a vacuum chamber connected to the other end of said vacuum line, said vacuum chamber comprising a lower section for collecting the condensate and an upper section communicating with said engine vacuum source by said vacuum line whereby the upper section of said vacuum chamber is maintained under vacuum during operation of said fuel system to produce said volatile gasoline fraction, said vacuum chamber having a pervious vaporliquid impingement separator means whereby sid condensate is separated from any uncondensed vapor, a vapor conduit connecting said vaporizing chamber with said vacuum chamber, condensing means in said vapor conduit whereby the vapor produced from said gasoline in said vaporizing chamber is substantially completely condensed, producing a liquid volatile gasoline fraction, a heater in heat exchange relationship with said liquid fuel line whereby said gasoline is heated prior to entering said vaporizing chamber thereby facilitating vaporization, a pressure responsive valve mans connected to said liquid fuel line and downstream of said heater, whereby a portion of said gasoline is vaporized in response to a predetermined pressure drop across said valve from the upstream side of said valve to the downstream side of said valve caused by said engine vacuum, and a volatile fuel storage tank having an inlet connected to said vacuum chamber through pump means and one-way check valve means, an outlet connected by a liquid volatile fuel conduit to the fuel induction means of said engine, pressure relief valve means adapted to open on reaching a predetermined pressure, and pressure regulating valve means in said liquid volatile fuel conduit adapted to deliver liquid volatile fuel to said fuel induction means at a preset pressure.
Claim 3
Dependent Claim
231 words
In a fuel system which feeds gasoline and a volatile gasoline fraction to a spark ignited internal combustion engine during selected periods of engine operation, the improvement comprising a. a vacuum line connected at one end to a source of engine vacuum, b. a vaporizing chamber connnected by a liquid fuel line to a gasoline tank, c. a vacuum chamber connected to the other end of said vacuum line, d. a vapor conduit connecting said vaporizing chamber with said vacuum chamber, e. a heater in heat exchange relationship with said liquid fuel line whereby said gasoline is heated prior to entering said vaporizing chamber thereby facilitating vaporization, f. a pressure responsive valve means connected to said liquid fuel line and downstream of said heater, whereby a portion of said gasoline is vaporiZed in repsonse to a predetermined pressure drop across said valve to the downstream side of said valve caused by said engine vacuum, and g. a volatile fuel storage tank having an inlet connected to said vacuum chamber through pump means and one-way check valve, an outlet connected by a liquid volatile fuel conduit to the fuel induction means of said engine, pressure relief valve means adapted to open on reaching a predetermined pressure, and pressure regulating valve means in said liquid volatile fuel conduit adapted to deliver liquid volatile fuel to said fuel induction means at a preset pressure.
Claim 4
Dependent Claim
231 words
In a fuel system which feeds gasoline and a volatile gasoline fraction to a spark ignited internal combustion engine during selected periods of engine operation, the improvement comprising a. a vacuum line connected at one end to a source of engine vacuum, b. a vaporizing chamber connnected by a liquid fuel line to a gasoline tank, c. a vacuum chamber connected to the other end of said vacuum line, d. a vapor conduit connecting said vaporizing chamber with said vacuum chamber, e. a heater in heat exchange relationship with said liquid fuel line whereby said gasoline is heated prior to entering said vaporizing chamber thereby facilitating vaporization, f. a pressure responsive valve means connected to said liquid fuel line and downstream of said heater, whereby a portion of said gasoline is vaporiZed in repsonse to a predetermined pressure drop across said valve to the downstream side of said valve caused by said engine vacuum, and g. a volatile fuel storage tank having an inlet connected to said vacuum chamber through pump means and one-way check valve, an outlet connected by a liquid volatile fuel conduit to the fuel induction means of said engine, pressure relief valve means adapted to open on reaching a predetermined pressure, and pressure regulating valve means in said liquid volatile fuel conduit adapted to deliver liquid volatile fuel to said fuel induction means at a preset pressure.
Claim 5
Dependent Claim
288 words
In a fuel system which feeds gasoline and a volatile gasoline fraction to a spark ignited internal combustion engine during selected periods of engine operation, the improvement comprising a. a vacuum line connected at one end to a source of engine vacuum; b. a vaporizing chamber connected by a liquid fuel line to a gasoline tank; c. a vacuum chamber connected to the other end of said vacuum line, said vacuum chamber comprising a lower section for collecting the condensate and an upper section communicating with said engine vacuum source by said vacuum line whereby the upper section of said vacuum chamber is maintained under vacuum during operation of said fuel system to produce said volatile gasoline fraction; d. a vapor conduit connecting said vaporizing chamber with said vacuum chamber; e. a heater in heat exchange relationship with said liquid fuel line whereby said gasoline is heated prior to entering said vaporizing chamber thereby facilitating vaporization; f. a pressure responsive valve means connected to said liquid fuel line and downstream of said heater, whereby a portion of said gasoline is vaporized in response to a predetermined pressure drop across said valve from the upstream side of said valve to the downstream side of said valve caused by said engine vacuum; and g. a volatile fuel storage tank having an inlet connected to said vacuum chamber through pump means and one-way check valve means, an outlet connected by a liquid volatile fuel conduit to the fuel induction means of said engine, pressure relief valve means adapted to open on reaching a predetermined pressure, and pressure regulating valve means in said liquid volatile fuel conduit adapted to deliver liquid volatile fuel to said fuel induction means at a preset pressure.
Claim 6
Dependent Claim
288 words
In a fuel system which feeds gasoline and a volatile gasoline fraction to a spark ignited internal combustion engine during selected periods of engine operation, the improvement comprising a. a vacuum line connected at one end to a source of engine vacuum; b. a vaporizing chamber connected by a liquid fuel line to a gasoline tank; c. a vacuum chamber connected to the other end of said vacuum line, said vacuum chamber comprising a lower section for collecting the condensate and an upper section communicating with said engine vacuum source by said vacuum line whereby the upper section of said vacuum chamber is maintained under vacuum during operation of said fuel system to produce said volatile gasoline fraction; d. a vapor conduit connecting said vaporizing chamber with said vacuum chamber; e. a heater in heat exchange relationship with said liquid fuel line whereby said gasoline is heated prior to entering said vaporizing chamber thereby facilitating vaporization; f. a pressure responsive valve means connected to said liquid fuel line and downstream of said heater, whereby a portion of said gasoline is vaporized in response to a predetermined pressure drop across said valve from the upstream side of said valve to the downstream side of said valve caused by said engine vacuum; and g. a volatile fuel storage tank having an inlet connected to said vacuum chamber through pump means and one-way check valve means, an outlet connected by a liquid volatile fuel conduit to the fuel induction means of said engine, pressure relief valve means adapted to open on reaching a predetermined pressure, and pressure regulating valve means in said liquid volatile fuel conduit adapted to deliver liquid volatile fuel to said fuel induction means at a preset pressure.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |