US5063886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stroke engine
Assignee: Toyota Motor Corp
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Filing: 1990-08-31
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Granted: 1991-11-12
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Expires: 2010-08-31
Abstract
Abstract A two-stroke engine having an intake valve and an exhaust valve arranged on an inner wall of the cylinder head, an intake passage connected to the cylinder via the intake valve, a fuel injection device arranged in the cylinder, for injecting fuel into the cylinder, a pressure regulator for regulating a fuel pressure supplied to the fuel injection device on the basis of a scavenging pressure in the intake passage, to thereby increase the fuel pressure in accordance with an increase of the scavenging pressure, and a control device for controlling the injection of fuel by the fuel injection device for a time ranging from a time at which the intake valve is opened to a time at which the scavenging pressure becomes equal to a pressure in the cylinder after the intake valve is closed.
Inventors
- 👤 Masanobu Kanamaru
- 👤 Norihiko Nakamura
- 👤 Toshio Tanahashi
- 👤 Yoshio Kido
- 👤 Toshio Ito
- 👤 Katsuhiko Hirose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:04
CPC Classifications
F; F02; F02B; F02B33/00; F02B33/32; F02B33/34; F02B33/36; F02B33/38; F02B25/00; F02B25/14; F02B25/145; F02D; F02D41/00; F02D41/0002; F02D41/0007; F02D41/30; F02D41/3094; F02D41/32; F02D41/34; F02M; F02M51/00; F02M51/06; F02M51/061; F02M51/0625; F02M51/0664; F02M51/0671; F02M69/00; F02M69/04; F02M69/042; F02M69/045; F02M69/10; F02B1/00; F02B1/02; F02B1/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/12; F02B2075/125; F02D41/38; F02D2041/389; F02D2400/00; F02D2400/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
169 words
A two-stroke engine having a cylinder, an intake valve and an exhaust valve arranged on an inner wall of a cylinder head and an intake passage connected to the cylinder via the intake valve, a pressure in the cylinder being lower than a scavenging pressure in the intake passage during a first portion of an opening period during which the intake valve is open and the pressure in the cylinder being substantially equal to the scavenging pressure in the intake passage during a latter portion of the opening period, said two-stroke engine comprising: fuel injection means arranged in the cylinder for injecting fuel into the cylinder; a pressure regulator for regulating a fuel pressure supplied to said fuel injection means on the basis of the scavenging pressure in the intake passage to thereby increase said fuel pressure in accordance with an increase of the scavenging pressure; and control means for controlling said fuel injection means to inject fuel into the cylinder during the latter portion of the opening period.
Claim 2
Dependent Claim
169 words
A two-stroke engine having a cylinder, an intake valve and an exhaust valve arranged on an inner wall of a cylinder head and an intake passage connected to the cylinder via the intake valve, a pressure in the cylinder being lower than a scavenging pressure in the intake passage during a first portion of an opening period during which the intake valve is open and the pressure in the cylinder being substantially equal to the scavenging pressure in the intake passage during a latter portion of the opening period, said two-stroke engine comprising: fuel injection means arranged in the cylinder for injecting fuel into the cylinder; a pressure regulator for regulating a fuel pressure supplied to said fuel injection means on the basis of the scavenging pressure in the intake passage to thereby increase said fuel pressure in accordance with an increase of the scavenging pressure; and control means for controlling said fuel injection means to inject fuel into the cylinder during the latter portion of the opening period.
Claim 3
Dependent Claim
50 words
A two-stroke engine according to claim 1, wherein the cylinder head comprises a masking wall arranged between said intake valve and said exhaust valve, to mask a valve opening formed between a valve seat and a peripheral portion of said intake valve, which is located on said exhaust valve side.
Claim 4
Dependent Claim
26 words
A two-stroke engine according to claim 2, wherein said masking wall masks said valve opening for the entire time for which said intake valve is open.
Claim 5
Dependent Claim
40 words
A two-stroke engine according to claim 3, wherein said fuel injection means and said masking wall are located on opposite sides of said intake valve, and a nozzle opening of said fuel injection means is located beneath the intake valve.
Claim 6
Dependent Claim
27 words
A two-stroke engine according to claim 4, wherein said engine has two intake valves and said fuel injection means is located beneath and between said intake valves.
Claim 7
Dependent Claim
16 words
A two-stroke engine according to claim 1, wherein a supercharger is arranged in said intake passage.
Claim 8
Dependent Claim
32 words
A two-stroke engine according to claim 1, wherein said pressure regulator regulates the fuel pressure to maintain said fuel pressure at a pressure higher than said scavenging pressure, by a predetermined value.
Claim 9
Dependent Claim
43 words
A two-stroke engine according to claim 7, wherein said pressure regulator comprises a diaphragm, a chamber defined by said diaphragm and connected to said intake passage, and a control valve operated by said diaphragm to control an amount of fuel to be returned.
Claim 10
Dependent Claim
28 words
A two-stroke engine according to claim 1, wherein a surge tank is arranged in said intake passage, and said scavenging pressure represents a pressure in said surge tank.
Claim 11
Dependent Claim
27 words
A two-stroke engine according to claim 1, wherein said control means controls the injection timing of said fuel injection means in accordance with an engine running condition.
Claim 12
Dependent Claim
63 words
A two-stroke engine according to claim 1, wherein an additional fuel injector is arranged in an intake port, and said pressure regulator regulates a fuel pressure supplied to said additional fuel injector on the basis of said scavenging pressure in said intake passage, to increase said fuel pressure supplied to said additional fuel injector in accordance with an increase of said scavenging pressure.
Claim 13
Dependent Claim
44 words
A two-stroke engine according to claim 11, wherein said pressure regulator regulates the fuel pressure supplied to said additional fuel injector to maintain the fuel pressure supplied to said additional fuel injector at a pressure higher than said scavenging pressure, by a predetermined value.
Claim 14
Dependent Claim
63 words
A two-stroke engine according to claim 11, wherein fuel is injected from only said fuel injection means when the amount of fuel to be injected is less than a predetermined amount of fuel, and fuel is injected from said fuel injection means and said additional fuel injector when the amount of fuel to be injected is more than said predetermined amount of fuel.
Claim 15
Dependent Claim
24 words
A two-stroke engine according to claim 13, wherein said predetermined amount of fuel is reduced in accordance with an increase of an engine speed.
Claim 16
Dependent Claim
25 words
A two-stroke engine according to claim 11, wherein fuel is injected from said additional fuel injector before fuel is injected from said fuel injection means.
References Cited (Backward Citations)
US4377145A
Cited
JPS5738662A
Cited
US4414940A
Cited
US4411235A
Cited
JPS58217730A
Cited
JPS605770A
Cited
JPS6036719A
Cited
US4616605A
Cited
US4790270A
Cited
WO1987000579A1
Cited
US4829964A
Cited
US4753213A
Cited
JPS63173814A
Cited
US4763626A
Cited
JPS63230920A
Cited
US4872437A
Cited
JPS6413265A
Cited
JPS6413263A
Cited
JPS6413264A
Cited
US4840147A
Cited
WO1990000222A1
Cited
US4957089A
Cited
US4960097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |