US6349698B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection pressure controlling method of gasoline direct injection engine
Assignee: Hyundai Motor Co
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Filing: 2000-12-22
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Granted: 2002-02-26
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Expires: 2020-12-22
Abstract
Abstract In an injection pressure control method of a GDI engine, an engine torque and an engine rpm are detected, then an initial stratified mode fuel pressure value is set according to the detected engine torque and engine rpm. Next, a weighting factor is calculated according to a variation rate in effective pressure of a combustion chamber of the engine, and a corrected stratified mode fuel pressure value is established by multiplying the wighting factor to the initial stratified mode fuel pressure value. Then, the corrected stratified mode fuel pressure value is compared with a current fuel pressure value, then a final fuel pressure value is obtained according to the comparision result.
Inventors
- 👤 Yong-Jung Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:44
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/3809; F02D41/3836; F02B; F02B17/00; F02B17/005; F02D41/3011; F02D41/3017; F02D41/3023
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
An injection pressure control method of a GDI engine comprising the steps of: detecting an engine torque and an engine rpm; setting an initial stratified mode fuel pressure value according to the detected engine torque and engine rpm; calculating a weighting factor according to a variation rate in effective pressure of a combustion chamber of the engine; establishing a corrected stratified mode fuel pressure value by multiplying the wighting factor to the initial stratified mode fuel pressure value; comparing the corrected stratified mode fuel pressure value with a current fuel pressure value; and calculating a final fuel pressure value according to the comparision result.
Claim 2
Dependent Claim
104 words
An injection pressure control method of a GDI engine comprising the steps of: detecting an engine torque and an engine rpm; setting an initial stratified mode fuel pressure value according to the detected engine torque and engine rpm; calculating a weighting factor according to a variation rate in effective pressure of a combustion chamber of the engine; establishing a corrected stratified mode fuel pressure value by multiplying the wighting factor to the initial stratified mode fuel pressure value; comparing the corrected stratified mode fuel pressure value with a current fuel pressure value; and calculating a final fuel pressure value according to the comparision result.
Claim 3
Dependent Claim
58 words
An injection pressure control method of claim 1 wherein the step of calculating the weighting factor comprises the steps of: dividing a variable compression section of a crankshaft rotation angle into a predetermined number of unit sections; detecting a variation ratio in the effective pressure in the unit sections; and setting the variation ratio as the weighting factor.
Claim 4
Dependent Claim
27 words
An injection pressure control method of claim 2 wherein the variable compression section is within a range of 40-60° of a crank angle after bottom dead center.
Claim 5
Dependent Claim
18 words
An injection pressure control method of claim 3 wherein the predetermined number of unit sections is about 20.
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) | 2005-02-25 | 2005-08-27 | 2006-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-02-25 | 2009-08-27 | 2010-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-02-25 | 2013-08-27 | 2014-02-26 | $7700.00 | Window Closed / Lapsed |