US6688279B2
Expired / Lapsed
US
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Compression-ignition internal combustion engine
Assignee: Isuzu Motors Ltd
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Filing: 2002-10-08
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Granted: 2004-02-10
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Expires: 2022-10-08
Abstract
Abstract A compression-ignition internal combustion engine for conducting pilot injection and main injection beyond the top dead center, wherein pilot injection quantity and timing are optimized. A compression-ignition internal combustion engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, the quantity and timing of the fuel injected through the fuel injection valve being controlled based on engine operating conditions; wherein pilot injection is carried out prior to the top dead center of compression, main injection is then carried out beyond the top dead center of compression, and fuel injection quantity and fuel injection timing of the pilot injection are set such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less.
Inventors
- 👤 Naoya Ishikawa
- 👤 Teruo Nakada
- 👤 Yutaka Uematsu
- 👤 Masato Honda
- 👤 Tetsuya Honma
- 👤 Jin Yokoyama
- 👤 Ryu Hariyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:35
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0057; F02D41/02; F02D41/021; F02D41/0235; F02D41/024; F02D41/30; F02D41/38; F02D41/40; F02D41/402; F02D41/403; F02B; F02B3/00; F02B3/06; F02D41/3809; F02D2041/3881; F02D35/00; F02D35/02; F02D35/023; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
118 words
A compression-ignition internal combustion engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, the fuel injection quantity and the fuel injection timing being controlled based on the engine operating conditions; wherein pilot injection of a comparatively small quantity is carried out through the fuel injection valve prior to the top dead center of compression, and main injection of a comparatively large quantity is then carried out through the fuel injection valve beyond the top dead center of compression; and the fuel injection quantity and fuel injection timing for the pilot injection are set such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less.
Claim 2
Dependent Claim
118 words
A compression-ignition internal combustion engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, the fuel injection quantity and the fuel injection timing being controlled based on the engine operating conditions; wherein pilot injection of a comparatively small quantity is carried out through the fuel injection valve prior to the top dead center of compression, and main injection of a comparatively large quantity is then carried out through the fuel injection valve beyond the top dead center of compression; and the fuel injection quantity and fuel injection timing for the pilot injection are set such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less.
Claim 3
Dependent Claim
55 words
The compression-ignition internal combustion engine according to claim 1 , wherein the timing on the most spark-advanced side of the pilot injection corresponds to the time of a crank angle at which the fuel injected through the fuel injection valve moves past the inlet edge of the cavity formed at the top of the piston.
Claim 4
Dependent Claim
29 words
The compression-ignition internal combustion engine according to claim 1 , wherein the EGR performed by a EGR apparatus is carried out according to the pilot injection and main injection.
Claim 5
Dependent Claim
21 words
The compression-ignition internal combustion engine according to claim 1 , wherein said compression-ignition internal combustion engine is a common-rail diesel engine.
Claim 6
Dependent Claim
158 words
A common-rail diesel engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, a common rail for constantly supplying high-pressure fuel to the fuel injection valve, and control means for controlling the fuel injection valve such that the quantity and timing of the fuel injected through the fuel injection valve are equivalent to the quantity and timing determined in advance based on the operating conditions of the engine; wherein the control means carries out pilot injection of a comparatively small quantity through the fuel injection valve prior to the top dead center of compression and then carries out main injection of a comparatively large quantity through the fuel injection valve beyond the top dead center of compression, and the pilot injection is carried out based on the fuel injection quantity and fuel injection timing such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less.
Claim 7
Dependent Claim
158 words
A common-rail diesel engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, a common rail for constantly supplying high-pressure fuel to the fuel injection valve, and control means for controlling the fuel injection valve such that the quantity and timing of the fuel injected through the fuel injection valve are equivalent to the quantity and timing determined in advance based on the operating conditions of the engine; wherein the control means carries out pilot injection of a comparatively small quantity through the fuel injection valve prior to the top dead center of compression and then carries out main injection of a comparatively large quantity through the fuel injection valve beyond the top dead center of compression, and the pilot injection is carried out based on the fuel injection quantity and fuel injection timing such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less.
Claim 8
Independent Claim
122 words
A method for controlling a compression-ignition internal combustion engine such that the quantity and timing of the fuel injected through the fuel injection valve into the combustion chamber in the cylinder is controlled based on the operating conditions of the engine; wherein pilot injection of a comparatively small quantity is carried out through the fuel injection valve prior to the top dead center of compression, and main injection of a comparatively large quantity is then carried out through the fuel injection valve beyond the top dead center of compression; and the fuel injection quantity and fuel injection timing in the pilot injection are set such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less.
Claim 9
Independent Claim
122 words
A method for controlling a compression-ignition internal combustion engine such that the quantity and timing of the fuel injected through the fuel injection valve into the combustion chamber in the cylinder is controlled based on the operating conditions of the engine; wherein pilot injection of a comparatively small quantity is carried out through the fuel injection valve prior to the top dead center of compression, and main injection of a comparatively large quantity is then carried out through the fuel injection valve beyond the top dead center of compression; and the fuel injection quantity and fuel injection timing in the pilot injection are set such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less.
Claim 10
Dependent Claim
203 words
A compression-ignition internal combustion engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, the quantity and timing of the fuel injected through the fuel injection valve being controlled based on the engine operating conditions; wherein the compression-ignition internal combustion engine comprises as fuel injection control modes: a first injection mode in which pilot injection is carried out through the fuel injection valve with a fuel injection quantity and fuel injection timing such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less, and main injection is then carried out through the fuel injection valve at a timing beyond the top dead center of compression; and a second injection mode in which pilot injection and main injection are carried out through the fuel injection valve on the basis of conditions that do not fulfill the conditions of the first injection mode; and the fuel injection control modes are switched such that fuel injection control is implemented in the second injection mode in the low-load areas of the engine operating conditions, and fuel injection control is implemented in the first injection mode in the high-load areas of the engine operating conditions.
Claim 11
Dependent Claim
203 words
A compression-ignition internal combustion engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, the quantity and timing of the fuel injected through the fuel injection valve being controlled based on the engine operating conditions; wherein the compression-ignition internal combustion engine comprises as fuel injection control modes: a first injection mode in which pilot injection is carried out through the fuel injection valve with a fuel injection quantity and fuel injection timing such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less, and main injection is then carried out through the fuel injection valve at a timing beyond the top dead center of compression; and a second injection mode in which pilot injection and main injection are carried out through the fuel injection valve on the basis of conditions that do not fulfill the conditions of the first injection mode; and the fuel injection control modes are switched such that fuel injection control is implemented in the second injection mode in the low-load areas of the engine operating conditions, and fuel injection control is implemented in the first injection mode in the high-load areas of the engine operating conditions.
Claim 12
Dependent Claim
62 words
The compression-ignition internal combustion engine according to claim 7 , wherein, in a low-load area of the engine, the fuel injection control modes are switched such that fuel injection control is implemented in the second injection mode in a low-speed area of the engine and fuel injection control is implemented in the first injection mode in a high-speed area of the engine.
Claim 13
Dependent Claim
24 words
The compression-ignition internal combustion engine according to claim 7 , wherein hysteresis is provided to the switch points of the fuel injection control modes.
Claim 14
Dependent Claim
24 words
The compression-ignition internal combustion engine according to claim 7 , wherein specific smoothing control is implemented when the fuel injection control modes are switched.
Claim 15
Dependent Claim
74 words
The compression-ignition internal combustion engine according to claim 7 , wherein the compression-ignition internal combustion engine is mounted in a vehicle, damper control is implemented to prevent coupled vibration of the engine and vehicle when the fuel injection quantity changes rapidly, and the fuel injection control modes are switched after a specific time elapses following implementation of the damper control when the fuel injection control modes are switched during implementation of the damper control.
Claim 16
Dependent Claim
28 words
The compression-ignition internal combustion engine according to claim 7 , wherein the EGR performed by a EGR apparatus is carried out according to the above-mentioned first injection mode.
Claim 17
Dependent Claim
21 words
The compression-ignition internal combustion engine according to claim 7 , wherein said compression-ignition internal combustion engine is a common-rail diesel engine.
Claim 18
Dependent Claim
235 words
A common-rail diesel engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, a common rail for constantly supplying high-pressure fuel to the fuel injection valve, and control means for controlling the injector such that the quantity and timing of the fuel actually injected through the fuel injection valve are equivalent to the target fuel injection quantity and target fuel injection timing determined in advance based on the operating conditions of the engine; wherein the control means comprises, as fuel injection control modes: a first injection mode in which pilot injection is carried out through the fuel injection valve with a fuel injection quantity and fuel injection timing such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less, and main injection is then carried out through the fuel injection valve at a timing beyond the top dead center of compression; and a second injection mode in which pilot injection and main injection are carried out through the fuel injection valve on the basis of conditions that do not fulfill the conditions of the first injection mode; and the fuel injection control modes are switched such that fuel injection control is implemented in the second injection mode in the low-load areas of the engine, and fuel injection control is implemented in the first injection mode in the high-load areas of the engine.
Claim 19
Dependent Claim
235 words
A common-rail diesel engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, a common rail for constantly supplying high-pressure fuel to the fuel injection valve, and control means for controlling the injector such that the quantity and timing of the fuel actually injected through the fuel injection valve are equivalent to the target fuel injection quantity and target fuel injection timing determined in advance based on the operating conditions of the engine; wherein the control means comprises, as fuel injection control modes: a first injection mode in which pilot injection is carried out through the fuel injection valve with a fuel injection quantity and fuel injection timing such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less, and main injection is then carried out through the fuel injection valve at a timing beyond the top dead center of compression; and a second injection mode in which pilot injection and main injection are carried out through the fuel injection valve on the basis of conditions that do not fulfill the conditions of the first injection mode; and the fuel injection control modes are switched such that fuel injection control is implemented in the second injection mode in the low-load areas of the engine, and fuel injection control is implemented in the first injection mode in the high-load areas of the engine.
Claim 20
Independent Claim
195 words
A method for controlling a compression-ignition internal combustion engine such that the quantity and timing of the fuel injected through the fuel injection valve into the combustion chamber in the cylinder is controlled based on the operating conditions of the engine; wherein, as fuel injection control modes, are set: a first injection mode in which pilot injection is carried out through the fuel injection valve with a fuel injection quantity and fuel injection timing such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less, and main injection is then carried out through the fuel injection valve at a timing beyond the top dead center of compression; and a second injection mode in which pilot injection and main injection are carried out through the fuel injection valve on the basis of conditions that do not fulfill the conditions of the first injection mode; and the fuel injection control modes are switched such that fuel injection control is implemented in the second injection mode in the low-load areas of the engine, and fuel injection control is implemented in the first injection mode in the high-load areas of the engine.
Claim 21
Independent Claim
195 words
A method for controlling a compression-ignition internal combustion engine such that the quantity and timing of the fuel injected through the fuel injection valve into the combustion chamber in the cylinder is controlled based on the operating conditions of the engine; wherein, as fuel injection control modes, are set: a first injection mode in which pilot injection is carried out through the fuel injection valve with a fuel injection quantity and fuel injection timing such that the maximum rate of heat release induced by the pilot injection is 60 kJ/s or less, and main injection is then carried out through the fuel injection valve at a timing beyond the top dead center of compression; and a second injection mode in which pilot injection and main injection are carried out through the fuel injection valve on the basis of conditions that do not fulfill the conditions of the first injection mode; and the fuel injection control modes are switched such that fuel injection control is implemented in the second injection mode in the low-load areas of the engine, and fuel injection control is implemented in the first injection mode in the high-load areas of the engine.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2007-02-09 | 2007-08-11 | 2008-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-02-09 | 2011-08-11 | 2012-02-10 | $3760.00 | Window Closed / Lapsed |
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