US4607603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system employing the second time differential of pressure or air flow rate
Assignee: Toyota Motor Corp
•
Filing: 1984-11-08
•
Granted: 1986-08-26
•
Expires: 2004-11-08
Abstract
Abstract Synchronous fuel injection amount of injected from a fuel injector in synchronization with rotation of an engine is controlled in relation to the second time differential of either the intake pipe pressure or intake flow rate.
Inventors
- 👤 Nobuyuki Kobayashi
- 👤 Toshimitsu Ito
- 👤 Kazuhiko Norota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:34
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/10; F02D41/045; F02D41/105
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
An electronically controlled fuel injection system to inject fuel from a fuel injector to an intake system having an intake pipe pressure and an air flow rate comprising: means for detecting a quantity X equal to one of said intake pipe pressure and an air flow rate with respect to time; means for determining a basic fuel injection amount as a function of X; means for detecting a second differential d 2 X/dt 2 of X with respect to time; and means for increasing synchronous fuel injection in relation to said second differential.
Claim 2
Dependent Claim
93 words
An electronically controlled fuel injection system to inject fuel from a fuel injector to an intake system having an intake pipe pressure and an air flow rate comprising: means for detecting a quantity X equal to one of said intake pipe pressure and an air flow rate with respect to time; means for determining a basic fuel injection amount as a function of X; means for detecting a second differential d 2 X/dt 2 of X with respect to time; and means for increasing synchronous fuel injection in relation to said second differential.
Claim 3
Dependent Claim
83 words
An electronically controlled fuel injection system as defined in claim 1, wherein said differential detecting means includes means for detecting said second differential in a predetermined cycle, and wherein said fuel injection increasing means includes means for carrying out a first increase of synchronous acceleration fuel injection if said second differential exceeds a first predetermined value and means for carrying out an increase of synchronous acceleration fuel injection in the second and succeeding cycles if said second differential exceeds a second predetermined value.
Claim 4
Dependent Claim
52 words
A system as defined in claim 2 wherein said means for calculating d 2 X/dt 2 comprises means for calculating an amount ΔX of change of X per a first predetermined time and for calculating as d 2 X/dt 2 an amount ΔΔX of change of ΔX per a second predetermined time.
Claim 5
Dependent Claim
35 words
A system as defined in claim 3 wherein the increase of synchronous fuel injection when ΔΔX is greater than said first predetermined value is different than when ΔΔX is greater than said second predetermined value.
Claim 6
Dependent Claim
19 words
A system as defined in claim 3, wherein said first predetermined value is greater than said second predetermined value.
Claim 7
Dependent Claim
29 words
A system as defined in claim 1 wherein an increase of a synchronous fuel injection according to d 2 X/dt 2 decreases by a predetermined amount in succeeding cycles.
References Cited (Backward Citations)
US3673989A
Cited
US4010717A
Cited
US4112879A
Cited
US4184458A
Cited
US4417556A
Cited
JPS57137630A
Cited
US4457283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |