Patent EP0098549A1 successfully refreshed from Google Patents.
EP0098549A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fuel injection system
Assignee: Hitachi Ltd
•
Filing: 1983-07-01
•
Granted: —
•
Expires: 2003-07-01
Abstract
Abstract @ A fuel injection system for an internal combustion engine has a fuel injector (10) disposed in a main air passage (33) upstream of a throttle valve (18). A part of air flowing through the main air passage is caused to flow through a by-pass air passage (5, 14) having outlet ports (8) open to the main air passage upstream of the injection orifice of the injector (10). A thermal type air flow meter (7, 9) measures the rate of air flow through the by-pass air passage. In order to prevent whirling-up of injected fuel and resultant adhesion of the fuel to walls adjacent to the by-pass air passage outlet ports (8), the cross-sectional area of the main air passage adjacent to the by-pass air passage outlet ports (8) is determined to be greater than that of the main air passage around the throttle valve (18) when in its fully open position.
Inventors
- 👤 Kimiji Karino
- 👤 Tokuo Kosuge
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 19:33
CPC Classifications
F; F02; F02M; F02M57/00; F02M69/00; F02M69/04; F02M69/042; F02M69/043; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/187; F02M51/00; F02M51/02; F02M51/06; F02M51/061; F02M51/0625; F02M51/0664; F02M51/0671; F02M51/0675; F02M51/08; F02M61/00; F02M61/16; F02M61/162; F02M69/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
206 words
A fuel injection system for an internal combustion engine comprising: means for defining a main air passage (33); a throttle valve (18) disposed in said main air passage (33) and adapted to control the flow rate of air to be supplied to the internal combustion engine; a fuel injector (10) disposed in said main air passage (33) upstream of said throttle valve (18) and adapted to supply a fuel to said engine; a by-pass air passage (5, 14) for causing a part of the air flowing through said main air passage (33) to flow therethrough and having at least one outlet port (8) opening to said main air passage (33) upstream of said fuel injector (10); and a heat-sensitive resistor (7) disposed in said by-pass air passage (5, 14) and adapted to measure the rate of air flow through said by-pass air passage (5, 14); the cross-sectional area of the portion of said main air passage (33) where said at least one outlet port (8) of said by-pass air passage (5, 14) opens to said main air passage (33) being greater than the cross-sectional area of said main air passage (33) around said throttle valve (18) when said throttle valve (18) is in its full-open position.
Claim 2
Dependent Claim
206 words
A fuel injection system for an internal combustion engine comprising: means for defining a main air passage (33); a throttle valve (18) disposed in said main air passage (33) and adapted to control the flow rate of air to be supplied to the internal combustion engine; a fuel injector (10) disposed in said main air passage (33) upstream of said throttle valve (18) and adapted to supply a fuel to said engine; a by-pass air passage (5, 14) for causing a part of the air flowing through said main air passage (33) to flow therethrough and having at least one outlet port (8) opening to said main air passage (33) upstream of said fuel injector (10); and a heat-sensitive resistor (7) disposed in said by-pass air passage (5, 14) and adapted to measure the rate of air flow through said by-pass air passage (5, 14); the cross-sectional area of the portion of said main air passage (33) where said at least one outlet port (8) of said by-pass air passage (5, 14) opens to said main air passage (33) being greater than the cross-sectional area of said main air passage (33) around said throttle valve (18) when said throttle valve (18) is in its full-open position.
Claim 3
Dependent Claim
58 words
A fuel injection system according to claim 1, wherein said fuel injector (10) is disposed between a cap (2) and a support (12) both disposed in said main air passage (33), each of said cap (2) and said support (12) being secured by at least two arms (5a, 27a) to said means for defining said main air passage.
Claim 4
Dependent Claim
44 words
A fuel injection system according to claim 2, wherein said by-pass air passage is formed in at least one of said arms (5a) securing said cap (2) and the upstream end of said by-pass passage is open in a peripheral wall of said cap.
Claim 5
Dependent Claim
33 words
A fuel injection system according to claim 2, wherein at least one of said arms (27a) securing said support is formed therein with a fuel passage (13) for supplying fuel to said injector.
Claim 6
Dependent Claim
36 words
A fuel injection system according to claim 2, wherein each of said cap (2) and said support (12) is fixed by two arms (27a, 5a) which extend in parallel to a shaft carrying said throttle valve.
Claim 7
Dependent Claim
28 words
A fuel injection system according to claim 1, wherein said by-pass air passage (5, 14) has a plurality of outlet ports (8) opening to said main air passage.
Claim 8
Dependent Claim
39 words
A fuel injection system according to claim 1, wherein a water jacket (19) for circulating a warmed engine cooling medium is formed in the wall (17) of said main air passage (33) defining means around said throttle valve (18).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.