Patent US6164264A successfully refreshed from Google Patents.
US6164264A
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Method for enhanced split injection in internal combustion engines
Assignee: MTU DETROIT DIESEL Inc
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Filing: 1999-06-03
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Granted: 2000-12-26
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Expires: 2019-06-03
Abstract
Abstract A method for controlling a compression-ignition internal combustion engine which provides delivery of multiple fuel injection pulses per cylinder firing with precision of pulse quantities, separation, and timing adequate for transition between split and single injection at any speed and load, without disturbing the primary engine governor. The method compensates for variable operating conditions such as supply voltage, injection pressure, injection pulse separation, and injector actuation latency or rise-time.
Inventors
- 👤 Eric D. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:53
CPC Classifications
F; F02; F02M; F02M45/00; F02M45/02; F02M45/04; F02D; F02D41/00; F02D41/30; F02D41/32; F02D41/34; F02D41/345; F02D41/38; F02D41/40; F02D41/401; F02D41/402; F02D41/403; F02B; F02B3/00; F02B3/06; F02D2200/00; F02D2200/50; F02D2200/503; F02D2250/00; F02D2250/18; F02D41/3809; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
169 words
A method of controlling fuel delivery in a fuel injector having an electronic control valve, the method comprising: establishing a pilot injection rise-time for the control valve; determining a pilot beginning of excitation time based on the pilot injection rise-time; determining an inter-pulse gap between a pilot injection termination and a main injection actuation based on engine conditions; establishing a main injection rise-time for the control valve; determining a main injection beginning of excitation time based on the desired inter-pulse gap and the main injection rise-time to allow split injection over a wide range of engine speeds; determining an observed fuel injection pressure; determining a desired fuel injection pressure based on engine conditions; determining a non-linear pulse adjustment factor based on the measured fuel injection pressure and the desired fuel injection pressure, the pulse adjustment factor being generally inversely proportional to the observed fuel injection pressure; determining a fuel quantity based on engine conditions; and determining the pulse width based on the fuel quantity and the pulse adjustment factor.
Claim 2
Independent Claim
169 words
A method of controlling fuel delivery in a fuel injector having an electronic control valve, the method comprising: establishing a pilot injection rise-time for the control valve; determining a pilot beginning of excitation time based on the pilot injection rise-time; determining an inter-pulse gap between a pilot injection termination and a main injection actuation based on engine conditions; establishing a main injection rise-time for the control valve; determining a main injection beginning of excitation time based on the desired inter-pulse gap and the main injection rise-time to allow split injection over a wide range of engine speeds; determining an observed fuel injection pressure; determining a desired fuel injection pressure based on engine conditions; determining a non-linear pulse adjustment factor based on the measured fuel injection pressure and the desired fuel injection pressure, the pulse adjustment factor being generally inversely proportional to the observed fuel injection pressure; determining a fuel quantity based on engine conditions; and determining the pulse width based on the fuel quantity and the pulse adjustment factor.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein determining the pulse adjustment factor further comprises: determining the pulse adjustment factor based on a ratio of the measured fuel injection pressure to the desired fuel injection pressure.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the pulse adjustment factor is determined from a look-up table indexed by the ratio.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the fuel quantity is a pilot injection fuel quantity.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein the fuel quantity is a main injection fuel quantity.
Claim 7
Independent Claim
92 words
A method of determining a pulse width for an electronic fuel injection in a common rail system, the method comprising: determining an observed fuel injection pressure; determining a desired fuel injection pressure based on engine conditions; determining a non-linear pulse adjustment factor based on the measured fuel injection pressure and the desired fuel injection pressure, the pulse adjustment factor being generally inversely proportional to the observed fuel injection pressure; determining a fuel quantity based on engine conditions; and determining the pulse width based on the fuel quantity and the pulse adjustment factor.
Claim 8
Independent Claim
92 words
A method of determining a pulse width for an electronic fuel injection in a common rail system, the method comprising: determining an observed fuel injection pressure; determining a desired fuel injection pressure based on engine conditions; determining a non-linear pulse adjustment factor based on the measured fuel injection pressure and the desired fuel injection pressure, the pulse adjustment factor being generally inversely proportional to the observed fuel injection pressure; determining a fuel quantity based on engine conditions; and determining the pulse width based on the fuel quantity and the pulse adjustment factor.
Claim 9
Dependent Claim
42 words
The method of claim 6 wherein fuel injection is performed as split injection including a pilot injection and a main injection, and wherein the fuel quantity is a main injection fuel quantity and the pulse width is a main injection pulse width.
Claim 10
Dependent Claim
34 words
The method of claim 6 wherein determining the pulse adjustment factor further comprises: determining the pulse adjustment factor based on a ratio of the measured fuel injection pressure to the desired fuel injection pressure.
Claim 11
Dependent Claim
20 words
The method of claim 8 wherein the pulse adjustment factor is determined from a look-up table indexed by the ratio.
Claim 12
Dependent Claim
15 words
The method of claim 6 wherein the fuel quantity is a pilot injection fuel quantity.
Claim 13
Dependent Claim
15 words
The method of claim 6 wherein the fuel quantity is a main injection fuel quantity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-12-26 | 2004-06-26 | 2004-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-12-26 | 2008-06-26 | 2008-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-12-26 | 2012-06-26 | 2012-12-26 | $7700.00 | Window Closed / Lapsed |