EP0924416A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Control system for diesel engine during cold-engine warm-up period
Assignee: Nissan Motor Co Ltd
•
Filing: 1998-12-08
•
Granted: —
•
Expires: 2018-12-08
Abstract
Abstract A diesel engine comprises a combustion-temperature control device for adjusting a combustion temperature of the engine depending on an engine operating condition, and an ignition-delay-duration control device for adjusting an ignition delay duration depending on the engine operating condition. An engine-temperature sensor is provided for detecting an engine temperature. During cold-engine warm-up period, an electronic control unit effectively compensates for both the combustion temperature and the ignition delay duration depending on the engine temperature, to reconcile the slow initial combustion in the early combustion stage and the sharp combustion in the middle or later combustion stage and so as to realize a so-called low-temperature premixed combustion with an increased rate of premixed combustion to diffusion combustion under a condition of low combustion temperatures.
Inventors
- 👤 Takashi Shirakawa
- 👤 Shuji Kimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 23:18
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/3011; F02D41/3017; F02D41/3035; F02D21/00; F02D21/06; F02D21/08; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0057; F02D41/02; F02D41/04; F02D41/06; F02D41/062; F02D41/064; F02D41/068; F02D41/3076; F02D41/38; F02D41/40; F02D41/401; F02M; F02M26/00; F02M26/13; F02M26/22; F02M26/23; F02M26/28; F02M41/00; F02M41/08; F02M41/10; F02M41/12; F02M41/123; F02M41/128; F02B; F02B1/00; F02B1/12; F02B2275/00; F02B2275/14; F02B2275/18; F02B29/00; F02B29/04; F02B29/0406; F02B3/00; F02B3/06; F02B37/00; F02B37/12; F02B37/24; F02D2041/389; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/063; F02D41/0077; F02D41/406; F02D41/408; F02M26/02; F02M26/04; F02M26/05; F02M41/02; F02M41/04; F02M41/042; F02M41/125; F02M41/126; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
102 words
A diesel engine comprising: a combustion-temperature control device for
adjusting a combustion temperature of the engine
depending on an engine operating condition; an ignition-delay-duration control device for
adjusting an ignition delay duration depending on the
engine operating condition; a sensor for detecting an engine temperature; a combustion-temperature compensator for
compensating for the combustion temperature, during a
cold-engine warm-up period, depending on the engine
temperature; and an ignition-delay-duration compensator for
compensating for the ignition delay duration, during the
cold-engine warm-up period, depending on the engine
temperature, whereby a rate of premixed combustion to diffusion
combustion increases under a condition of low combustion
temperatures.
Claim 2
Dependent Claim
19 words
The diesel engine as claimed in claim 1, wherein
said combustion-temperature control device comprises an
exhaust gas recirculation system.
Claim 3
Dependent Claim
19 words
The diesel engine as claimed in claim 1, wherein
said ignition-delay-duration control device comprises
a fuel-injection timing adjustment device.
Claim 4
Dependent Claim
36 words
The diesel engine as claimed in claim 1, wherein
said combustion-temperature control device and said
ignition-delay-duration control device both comprise an
exhaust-gas-recirculation gas cooling device for
cooling part of exhaust gases sent back through the
engine.
Claim 5
Dependent Claim
48 words
The diesel engine as claimed in claim 1, which
further comprises a swirl generating device for
generating a controlled swirl flow in a combustion
chamber of the engine, and a swirl-intensity compensator
for compensating for a swirl intensity of the controlled
swirl flow depending on the engine temperature.
Claim 6
Dependent Claim
22 words
The diesel engine as claimed in claim 1, wherein
said sensor comprises a water-temperature sensor for
detecting a temperature of engine coolant.
Claim 7
Dependent Claim
61 words
The diesel engine as claimed in claim 5, wherein
said swirl-intensity compensator enlarges a rate of a
high-level swirl zone to a low-level swirl zone by varying
a boundary line between the high-level swirl zone and
the low-level swirl zone, when the engine temperature
is below a predetermined temperature value, and the
boundary line is based on engine speed and load.
Claim 8
Dependent Claim
87 words
The diesel engine as claimed in claim 7, wherein
said swirl-intensity compensator comprises an engine
speed sensor for detecting engine speed and an engine
load sensor for detecting engine load, and the high-level
swirl zone is enlarged and the low-level swirl zone
is contracted by making a downward correction to an engine
speed data detected by the engine speed sensor by a first
correction factor and by making a downward correction
to an engine load data detected by the engine load sensor
by a second correction factor.
Claim 9
Dependent Claim
104 words
A diesel engine comprising: a combustion-temperature control means for
adjusting a combustion temperature of the engine
depending on an engine operating condition; an ignition-delay-duration control means for
adjusting an ignition delay duration depending on the
engine operating condition; a sensor for detecting an engine temperature; a combustion-temperature compensation means for
compensating for the combustion temperature, during a
cold-engine warm-up period, depending on the engine
temperature; and an ignition-delay-duration compensation means for
compensating for the ignition delay duration, during the
cold-engine warm-up period, depending on the engine
temperature, whereby a rate of premixed combustion to diffusion
combustion increases under a condition of low combustion
temperatures.
Claim 10
Dependent Claim
19 words
The diesel engine as claimed in claim 9, wherein
said combustion-temperature control means comprises an
exhaust gas recirculation system.
Claim 11
Dependent Claim
19 words
The diesel engine as claimed in claim 9, wherein
said ignition-delay-duration control means comprises a
fuel-injection timing adjustment device.
Claim 12
Dependent Claim
36 words
The diesel engine as claimed in claim 9, wherein
said combustion-temperature control means and said
ignition-delay-duration control means both comprise an
exhaust-gas-recirculation gas cooling device for
cooling part of exhaust gases sent back through the
engine.
Claim 13
Dependent Claim
49 words
The diesel engine as claimed in claim 9, which
further comprises a swirl generating means for generating
a controlled swirl flow in a combustion chamber of the
engine, and a swirl-intensity compensation means for
compensating for a swirl intensity of the controlled
swirl flow depending on the engine temperature.
Claim 14
Dependent Claim
22 words
The diesel engine as claimed in claim 9, wherein
said sensor comprises a water-temperature sensor for
detecting a temperature of engine coolant.
Claim 15
Dependent Claim
62 words
The diesel engine as claimed in claim 13, wherein
said swirl-intensity compensation means enlarges a rate
of a high-level swirl zone to a low-level swirl zone by
varying a boundary line between the high-level swirl zone
and the low-level swirl zone, when the engine temperature
is below a predetermined temperature value, and the
boundary line is based on engine speed and load.
Claim 16
Dependent Claim
178 words
An electronic control system for a direct-injection
diesel engine having a combustion-temperature control
device for adjusting a combustion temperature of the
engine depending on an engine operating condition, and
an ignition-delay-duration control device for adjusting
an ignition delay duration depending on the engine
operating condition, said electronic control system
comprising: an engine temperature detection means for detecting
an engine temperature; a combustion-temperature compensation means for
compensating for the combustion temperature adjusted by
said combustion-temperature control means, during a
cold-engine warm-up period, depending on the engine
temperature, and for generating an engine-temperature
dependent combustion-temperature control command, so
that the combustion temperature is feedback controlled
in response to the engine-temperature dependent
combustion-temperature control command; and an ignition-delay-duration compensation means for
compensating for the ignition delay duration, during the
cold-engine warm-up period, depending on the engine
temperature, and for generating an engine-temperature
dependent ignition-delay-duration control command, so
that the ignition delay duration is feedback controlled
in response to the engine-temperature dependent
ignition-delay-duration control command, whereby a rate of premixed combustion to diffusion
combustion increases under a condition of low combustion
temperatures.
Claim 17
Dependent Claim
33 words
The electronic control system as claimed in claim
16, wherein said combustion-temperature control means
comprises an exhaust gas recirculation system capable
of regulating the combustion temperature by adjustment
of an amount of exhaust-gas-recirculation.
Claim 18
Dependent Claim
37 words
The electronic control system as claimed in claim
16, wherein said ignition-delay-duration control means
comprises a fuel-injection timing adjustment device
capable of regulating the ignition delay duration by
adjustment of a timing of initiation of fuel injection.
Claim 19
Dependent Claim
61 words
The electronic control system as claimed in claim
16, said combustion-temperature control means and said
ignition-delay-duration control means both comprise an
exhaust-gas-recirculation gas cooling device for
cooling part of exhaust gases sent back through the engine
and for increasing a density of fresh air entering the
combustion chamber to advance a point of initiation of
ignition and lower the combustion temperature.
Claim 20
Dependent Claim
50 words
The electronic control system as claimed in claim
16, which further comprises a swirl generating device
for generating a controlled swirl flow in a combustion
chamber of the engine, and a swirl-intensity compensation
means for compensating for a swirl intensity of the
controlled swirl flow depending on the engine
temperature.
Claim 21
Dependent Claim
63 words
The electronic control system as claimed in claim
20, wherein said swirl-intensity compensation means
enlarges a rate of a high-level swirl zone to a low-level
swirl zone by varying a boundary line between the
high-level swirl zone and the low-level swirl zone, when
the engine temperature is below a predetermined
temperature value, and the boundary line is based on
engine speed and load.
Claim 22
Dependent Claim
89 words
The electronic control system as claimed in claim
21, wherein said swirl-intensity compensation means
comprises an engine speed sensor for detecting engine
speed and an engine load sensor for detecting engine load,
and the high-level swirl zone is enlarged and the
low-level swirl zone is contracted by making a downward
correction to an engine speed data detected by the engine
speed sensor by a first correction factor and by making
a downward correction to an engine load data detected
by the engine load sensor by a second correction factor.
References Cited (Backward Citations)
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