Patent US6516787B1 successfully refreshed from Google Patents.
Patent US3835983A successfully refreshed from Google Patents.
Patent US6612292B2 successfully refreshed from Google Patents.
US6612292B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection control for diesel engine
Assignee: Nissan Motor Co Ltd
•
Filing: 2001-11-30
•
Granted: 2003-09-02
•
Expires: 2021-11-30
Abstract
Abstract A sensor ( 55 ) detects a parameter expressing the oxygen concentration or oxygen amount in gas aspirated into the diesel engine ( 51 ). A controller ( 41 ) calculates a target parameter during a steady running state of the diesel engine ( 51 ) (S 4 ) and calculates a difference between the measured parameter and the target parameter (S 212 ). When the difference is large, following a small amount of pilot fuel injection, a main fuel injection is performed at a timing that makes the combustion of fuel complete before the compression top dead center of the piston ( 51 C). When the difference is small, a larger amount of pilot fuel injection is performed and the main fuel injection is performed after the injected fuel is combusted. By varying the fuel injection pattern in this way, combustion noise and the deterioration of exhaust gas composition in a transient running state of the diesel engine ( 51 ) is suppressed.
Inventors
- 👤 Takashi Shirakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:33
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/3011; F02D41/3017; F02D41/3035; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0065; F02D41/0072; F02D41/02; F02D41/04; F02D41/10; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1446; F02D41/1447; F02D41/1448; F02D41/38; F02D41/3809; F02D41/3836; F02D41/3845; F02D41/40; F02D41/402; F02D41/403; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0406; F02D2200/0414; F02D2200/70; F02D2200/703; F02D41/0077; F02D41/1401; F02D41/1402; F02D41/18; F02D41/187; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
244 words
A fuel injection control device for a diesel engine, the diesel engine comprising a piston reciprocating through a compression top dead center and a fuel injection mechanism of which a fuel injection amount and a fuel injection timing is controllable, the device comprising: a sensor which detects a parameter expressing either of oxygen concentration and oxygen amount in gas aspirated into the diesel engine; and a programmable controller programmed to: calculate a difference between a parameter value set for a steady running state of the diesel engine and the parameter detected by the sensor; control the fuel injection mechanism, when the difference is greater than a predetermined value, to cause the fuel injection mechanism to perform a main fuel injection at a first timing which completes a combustion of an injected fuel before the compression top dead center and a pilot fuel injection at a second timing earlier than the first timing; and control the fuel injection mechanism, when the difference is smaller than the predetermined value, to cause the fuel injection mechanism to perform a pilot fuel injection at a third timing with an injection amount which is larger than an injection amount of the pilot injection performed when the difference is greater than the predetermined value, and a main injection at a fourth timing, an interval between the third timing and the fourth timing being larger than a period required for combusting fuel injected by the pilot injection at the third timing.
Claim 2
Dependent Claim
244 words
A fuel injection control device for a diesel engine, the diesel engine comprising a piston reciprocating through a compression top dead center and a fuel injection mechanism of which a fuel injection amount and a fuel injection timing is controllable, the device comprising: a sensor which detects a parameter expressing either of oxygen concentration and oxygen amount in gas aspirated into the diesel engine; and a programmable controller programmed to: calculate a difference between a parameter value set for a steady running state of the diesel engine and the parameter detected by the sensor; control the fuel injection mechanism, when the difference is greater than a predetermined value, to cause the fuel injection mechanism to perform a main fuel injection at a first timing which completes a combustion of an injected fuel before the compression top dead center and a pilot fuel injection at a second timing earlier than the first timing; and control the fuel injection mechanism, when the difference is smaller than the predetermined value, to cause the fuel injection mechanism to perform a pilot fuel injection at a third timing with an injection amount which is larger than an injection amount of the pilot injection performed when the difference is greater than the predetermined value, and a main injection at a fourth timing, an interval between the third timing and the fourth timing being larger than a period required for combusting fuel injected by the pilot injection at the third timing.
Claim 3
Dependent Claim
39 words
The fuel injection control device as defined in claim 1 , wherein the diesel engine further comprises a turbocharger which turbocharges an intake fresh air of the diesel engine, and the parameter comprises a turbocharging pressure of the turbocharger.
Claim 4
Dependent Claim
24 words
The fuel injection control device as defined in claim 1 , wherein the parameter comprises an intake fresh air amount of the diesel engine.
Claim 5
Dependent Claim
59 words
The fuel injection control device as defined in claim 1 , wherein the diesel engine further comprises an exhaust recirculation mechanism which recirculates a part of an exhaust gas of the diesel engine into the diesel engine, and the parameter comprises either of an exhaust gas recirculation amount and an exhaust gas recirculation rate of the exhaust recirculation mechanism.
Claim 6
Dependent Claim
28 words
The fuel injection control device as defined in claim 1 , wherein the parameter comprises an air excess factor of a fuel mixture combusted in the diesel engine.
Claim 7
Dependent Claim
46 words
The fuel injection control device as defined in claim 1 , wherein the controller is further programmed to prevent the fuel injection mechanism from performing the pilot fuel injection when the difference is smaller than a second predetermined value which is smaller than the predetermined value.
Claim 8
Dependent Claim
44 words
The fuel injection control device as defined in claim 6 , wherein the controller is further programmed to set the main fuel injection timing, when the difference is smaller than the second predetermined value, to a timing later than the compression top dead center.
Claim 9
Dependent Claim
91 words
The fuel injection control device as defined in claim 1 , wherein the diesel engine further comprises an exhaust recirculation mechanism which recirculates a part of an exhaust gas of the diesel engine into the diesel engine, and the controller is further programmed to control the fuel injection mechanism and the exhaust recirculation mechanism to cause the diesel engine to perform a low-temperature premixing combustion which has a heat release pattern of a single-stage, when the difference is smaller than a second predetermined value which is smaller than the predetermined value.
Claim 10
Dependent Claim
68 words
The fuel injection control device as defined in claim 1 , wherein the injection amount of the pilot fuel injection performed when the difference is greater than the predetermined value is set to 0.2 to 1.0 milligrams per stroke cycle of the piston, and an interval between the first timing and the second timing is set to 7 to 18 degrees in a crank angle of the piston.
Claim 11
Dependent Claim
65 words
The fuel injection control device as defined in claim 1 , wherein the injection amount of the pilot fuel injection performed when the difference is smaller than the predetermined value is set to 1.5 to 3.0 milligrams per stroke cycle of the piston, and the interval between the third timing and the fourth timing is set to 30 degrees in crank angle of the piston.
Claim 12
Dependent Claim
48 words
The fuel injection control device as defined in claim 1 , wherein the device further comprises a sensor which detects an operating state of the diesel engine, and the controller is further programmed to calculate the target parameter value based on the operating state of the diesel engine.
Claim 13
Dependent Claim
243 words
A fuel injection control device for a diesel engine, the diesel engine comprising a piston reciprocating through a compression top dead center and a fuel injection mechanism of which a fuel injection amount and a fuel injection timing is controllable, the device comprising: means which detects a parameter expressing either of oxygen concentration and oxygen amount in gas aspirated into the diesel engine; means for calculating a difference between a parameter value set for a steady running state of the diesel engine and the parameter detected by the sensor; means for controlling the fuel injection mechanism, when the difference is greater than a predetermined value, to cause the fuel injection mechanism to perform a main fuel injection at a first timing which completes a combustion of an injected fuel before the compression top dead center and a pilot fuel injection at a second timing earlier than the first timing; and means for controlling the fuel injection mechanism, when the difference is smaller than the predetermined value, to cause the fuel injection mechanism to perform a pilot fuel injection at a third timing with an injection amount which is larger than an injection amount of the pilot injection performed when the difference is greater than the predetermined value, and a main injection at a fourth timing, an interval between the third timing and the fourth timing being larger than a period required for combusting fuel injected by the pilot injection at the third timing.
Claim 14
Dependent Claim
243 words
A fuel injection control device for a diesel engine, the diesel engine comprising a piston reciprocating through a compression top dead center and a fuel injection mechanism of which a fuel injection amount and a fuel injection timing is controllable, the device comprising: means which detects a parameter expressing either of oxygen concentration and oxygen amount in gas aspirated into the diesel engine; means for calculating a difference between a parameter value set for a steady running state of the diesel engine and the parameter detected by the sensor; means for controlling the fuel injection mechanism, when the difference is greater than a predetermined value, to cause the fuel injection mechanism to perform a main fuel injection at a first timing which completes a combustion of an injected fuel before the compression top dead center and a pilot fuel injection at a second timing earlier than the first timing; and means for controlling the fuel injection mechanism, when the difference is smaller than the predetermined value, to cause the fuel injection mechanism to perform a pilot fuel injection at a third timing with an injection amount which is larger than an injection amount of the pilot injection performed when the difference is greater than the predetermined value, and a main injection at a fourth timing, an interval between the third timing and the fourth timing being larger than a period required for combusting fuel injected by the pilot injection at the third timing.
Claim 15
Dependent Claim
235 words
A fuel injection control method for a diesel engine, the diesel engine comprising a piston reciprocating through a compression top dead center and a fuel injection mechanism of which a fuel injection amount and a fuel injection timing is controllable, the method comprising: detecting a parameter expressing either of oxygen concentration and oxygen amount in gas aspirated into the diesel engine; calculating a difference between a parameter value set for a steady running state of the diesel engine and the parameter detected by the sensor; controlling the fuel injection mechanism, when the difference is greater than a predetermined value, to cause the fuel injection mechanism to perform a main fuel injection at a first timing which completes a combustion of an injected fuel before the compression top dead center and a pilot fuel injection at a second timing earlier than the first timing; and controlling the fuel injection mechanism, when the difference is smaller than the predetermined value, to cause the fuel injection mechanism to perform a pilot fuel injection at a third timing with an injection amount which is larger than an injection amount of the pilot injection performed when the difference is greater than the predetermined value, and a main injection at a fourth timing, an interval between the third timing and the fourth timing being larger than a period required for combusting fuel injected by the pilot injection at the third timing.
Claim 16
Dependent Claim
235 words
A fuel injection control method for a diesel engine, the diesel engine comprising a piston reciprocating through a compression top dead center and a fuel injection mechanism of which a fuel injection amount and a fuel injection timing is controllable, the method comprising: detecting a parameter expressing either of oxygen concentration and oxygen amount in gas aspirated into the diesel engine; calculating a difference between a parameter value set for a steady running state of the diesel engine and the parameter detected by the sensor; controlling the fuel injection mechanism, when the difference is greater than a predetermined value, to cause the fuel injection mechanism to perform a main fuel injection at a first timing which completes a combustion of an injected fuel before the compression top dead center and a pilot fuel injection at a second timing earlier than the first timing; and controlling the fuel injection mechanism, when the difference is smaller than the predetermined value, to cause the fuel injection mechanism to perform a pilot fuel injection at a third timing with an injection amount which is larger than an injection amount of the pilot injection performed when the difference is greater than the predetermined value, and a main injection at a fourth timing, an interval between the third timing and the fourth timing being larger than a period required for combusting fuel injected by the pilot injection at the third timing.
References Cited (Backward Citations)
JP2864896B2
Cited
JPH06346763A
Cited
US5803022A
Cited
US6161519A
Cited
JP2000064891A
Cited
US6276347B1
Cited
US6390076B2
Cited
US6158413A
Cited
US6332447B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-09-01 | 2007-03-03 | 2007-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-09-01 | 2011-03-03 | 2011-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-09-01 | 2015-03-03 | 2015-09-02 | $7700.00 | Window Closed / Lapsed |