US4719893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine with throttle tipout dilution reduction
Assignee: Motors Liquidation Co
•
Filing: 1987-03-10
•
Granted: 1988-01-19
•
Expires: 2007-03-10
Abstract
Abstract An internal combustion engine with a throttle valve, fuel supply and dilution (EGR) control includes apparatus effective to detect a throttle tipout condition comprising a rate of throttle closing exceeding a predetermined reference rate and decrease the dilution from the scheduled value to its minimum value during the existence of the throttle tipout condition and further apparatus effective to detect the end of the throttle tipout condition and return the dilution to its scheduled value at a controlled rate. Thus, a sudden unscheduled increase in dilution caused by a throttle tipout associated increase in intake manifold vacuum is reduced and driveability improved.
Inventors
- 👤 Kenneth J. Buslepp
- 👤 Kenneth J. Cinpinski
- 👤 James H. Currie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:02
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/02; F02D41/04; F02D41/12; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
An internal combustion engine comprising fuel charge supply apparatus including a throttle effective to control the mass airflow to a combustion chamber, fuel supply apparatus effective to form a combustible fuel charge therein and dilution control apparatus effective to control the admittance of exhaust gasses to the fuel charge to thereby control the dilution thereof according to a predetermined schedule, the engine being of the type which responds to a throttle tipout condition with a sudden, unscheduled increase in dilution, the engine further combprising: first means effective to detect a throttle tipout condition comprising a rate of throttle closing exceeding a predetermined reference rate and decrease the dilution from the scheduled value to its minimum value during the existence of the throttle tipout condition; and second means to detect the end of the throttle tipout condition and return the dilution to its scheduled value at a controlled rate.
Claim 2
Dependent Claim
148 words
An internal combustion engine comprising fuel charge supply apparatus including a throttle effective to control the mass airflow to a combustion chamber, fuel supply apparatus effective to form a combustible fuel charge therein and dilution control apparatus effective to control the admittance of exhaust gasses to the fuel charge to thereby control the dilution thereof according to a predetermined schedule, the engine being of the type which responds to a throttle tipout condition with a sudden, unscheduled increase in dilution, the engine further combprising: first means effective to detect a throttle tipout condition comprising a rate of throttle closing exceeding a predetermined reference rate and decrease the dilution from the scheduled value to its minimum value during the existence of the throttle tipout condition; and second means to detect the end of the throttle tipout condition and return the dilution to its scheduled value at a controlled rate.
Claim 3
Dependent Claim
30 words
The engine of claim 1 in which the dilution control apparatus includes an EGR valve and the minimum value of dilution corresponds to a complete closing of the EGR valve.
Claim 4
Dependent Claim
39 words
The engine of claim 1 in which the dilution control apparatus includes a variable valve lilft mechanism for exhaust valves in the combustion chamber and the minimum dilution value corresponds to a predetermined valve lift of such exhaust valves.
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) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |