EP1035314A2
Expired / Lapsed
EP
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Method of controlling combustion of a direct-injection diesel engine by performing multiple injections
Assignee: Centro Ricerche Fiat SCpA
•
Filing: 2000-03-03
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Granted: —
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Expires: 2020-03-03
Abstract
Abstract There is described a method of controlling the combustion of a direct-injection diesel engine (2) having a common-rail injection system. The control method includes the steps of performing, at each engine cycle and in each cylinder (4) of the engine (2), a first main fuel injection (MAIN1) around the end-of-compression top dead center position, and at least one of a first auxiliary fuel injection (PRE) preceding the first main injection (MAIN1), and a second auxiliary fuel injection (AFTER, MAIN2) following the first main injection (MAIN1). More specifically, the two auxiliary injections are performed close enough to the first main injection (MAIN1) to take part, together with the first main injection (MAIN1), in the actual combustion of the fuel, so as to reduce the pollutant substances present in the exhaust gases, and the combustion noise produced by the engine (2). <IMAGE>
Inventors
- 👤 Riccardo Buratti
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 18:36
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D41/402; F02D41/3809; F02D41/3827; F02D41/02; F02D41/021; F02D41/0235; F02D41/024; F02D41/0255; F02D41/027; F02D41/0275; F02D41/04; F02D41/06; F02D41/062; F02D41/068; F02D41/403; F02D41/405; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
141 words
A method of controlling the combustion of a
direct-injection diesel engine (2) having a common-rail
injection system (1), said method comprising the step of
performing, at each engine cycle and in each cylinder (4)
of said engine (2), a first main fuel injection (MAIN1)
around the end-of-compression top dead center position,
and being characterized by also comprising the step of
performing, at each engine cycle and in each cylinder (4)
of said engine (2), at least one of a first auxiliary
fuel injection (PRE) before said first main injection
(MAIN1), and a second auxiliary fuel injection (AFTER,
MAIN2) after said first main injection (MAIN1); said
first and said second auxiliary injection (PRE, AFTER,
MAIN2) being performed close enough to said first main
injection (MAIN1) to take part, together with the first
main injection (MAIN1), in the actual combustion of the
fuel.
Claim 2
Dependent Claim
35 words
A method as claimed in Claim 1, characterized in
that said first main injection (MAIN1) starts at an
engine angle value which is mainly a function of the
speed and load of said engine (2).
Claim 3
Dependent Claim
35 words
A method as claimed in Claim 1 or 2,
characterized in that said first main injection (MAIN1)
starts at an engine angle value ranging between 30°
before and 10° after said top dead center position.
Claim 4
Independent Claim
25 words
A method as claimed in any one of the foregoing
Claims, characterized in that said first main injection
(MAIN1) lasts from 100 to 4000 µs.
Claim 5
Independent Claim
29 words
A method as claimed in any one of the foregoing
Claims, characterized by comprising the step of
performing both said first and said second auxiliary
injection (PRE, MAIN2, AFTER).
Claim 6
Independent Claim
46 words
A method as claimed in any one of the foregoing
Claims, characterized in that said first auxiliary
injection (PRE) is a first preinjection (PRE) starting at
an engine angle value ranging between 60° before said top
dead center position and the top dead center position
itself.
Claim 7
Dependent Claim
20 words
A method as claimed in Claim 6, characterized in
that said first preinjection (PRE) lasts from 100 to 1000
µs.
Claim 8
Dependent Claim
30 words
A method as claimed in Claim 6 or 7,
characterized in that said first preinjection (PRE) ends
at least 80 µs before the start of said first main
injection (MAIN1).
Claim 9
Independent Claim
30 words
A method as claimed in any one of the foregoing
Claims, characterized in that said first preinjection
(PRE) injects a smaller amount of fuel than said first
main injection (MAIN1).
Claim 10
Independent Claim
44 words
A method as claimed in any one of the foregoing
Claims, characterized in that said second auxiliary
injection is a first postinjection (AFTER) starting at an
engine angle value ranging between said top dead center
position and 100° after the top dead center position.
Claim 11
Dependent Claim
20 words
A method as claimed in Claim 10, characterized
in that said first postinjection (AFTER) lasts from 100
to 1000 µs.
Claim 12
Dependent Claim
30 words
A method as claimed in Claim 10 or 11,
characterized in that said first postinjection (AFTER)
starts at least 80 µs after the end of said first main
injection (MAIN1).
Claim 13
Independent Claim
31 words
A method as claimed in any one of Claims 10 to
12, characterized in that said first postinjection
(AFTER) inject a smaller amount of fuel than said first
main injection (MAIN1).
Claim 14
Independent Claim
50 words
A method as claimed in any one of Claims 10 to
13, characterized by also comprising the step of
performing, at each engine cycle and in each cylinder (4)
of said engine (2), a second main injection (MAIN2)
following said first main injection (MAIN1) and preceding
said first postinjection (AFTER).
Claim 15
Dependent Claim
33 words
A method as claimed in Claim 14, characterized
in that said second main injection (MAIN2) starts at an
engine angle value ranging between 30° before and 10°
after said top dead center position.
Claim 16
Dependent Claim
23 words
A method as claimed in Claim 14 or 15,
characterized in that said second main injection (MAIN2)
lasts from 100 to 2000 µs.
Claim 17
Independent Claim
34 words
A method as claimed in any one of Claims 14 to
16, characterized in that said second main injection
(MAIN2) starts at least 80 µs after the end of said first
main injection (MAIN1).
Claim 18
Independent Claim
48 words
A method as claimed in any one of Claims 10 to
17, characterized by also comprising the step of
performing, at each engine cycle and in each cylinder (4)
of said engine (2), a second postinjection (POST)
following said first postinjection (AFTER) and performed
during the exhaust stroke.
Claim 19
Dependent Claim
43 words
A method as claimed in Claim 18, characterized
in that said second postinjection (POST) starts at an
engine angle value ranging between 20° before and 210°
after said top dead center position, or between 270° and
360° after said top dead center position.
Claim 20
Dependent Claim
22 words
A method as claimed in Claim 18 or 19,
characterized in that said second postinjection (POST)
lasts from 100 to 500 µs.
Claim 21
Independent Claim
32 words
A method as claimed in any one of Claims 18 to
20, characterized in that said second postinjection
(POST) starts at least 280 µs after the end of said first
postinjection (AFTER).
Claim 22
Independent Claim
31 words
A method as claimed in any one of Claims 18 to
21, characterized in that said second postinjection
(POST) injects a smaller amount of fuel than said first
main injection (MAIN1).
Claim 23
Independent Claim
43 words
A method as claimed in any one of Claims 1 to 9,
characterized in that said second auxiliary injection is
a second main injection (MAIN2) starting at an engine
angle value ranging between 30° before and 10° after said
top dead center position.
Claim 24
Dependent Claim
21 words
A method as claimed in Claim 23, characterized
in that said second main injection (MAIN2) lasts from 100
to 2000 µs.
Claim 25
Dependent Claim
31 words
A method as claimed in Claim 23 or 24,
characterized in that said second main injection (MAIN2)
starts at least 80 µs after the end of said first main
injection (MAIN1).
Claim 26
Independent Claim
77 words
A method as claimed in any one of Claims 23 to
25, characterized by also comprising the step of
performing, at each engine cycle and in each cylinder (4)
of said engine (2), a first postinjection (AFTER)
following said second main injection (MAIN2) and
performed close enough to said first and said second main
injection (MAIN1, MAIN2) to take part, together with the
first and second main injection (MAIN1, MAIN2), in the
actual combustion of the fuel.
Claim 27
Dependent Claim
35 words
A method as claimed in Claim 26, characterized
in that said first postinjection (AFTER) starts at an
engine angle value ranging between said top dead center
position and 100° after the top dead center position.
Claim 28
Dependent Claim
22 words
A method as claimed in Claim 26 or 27,
characterized in that said first postinjection (AFTER)
lasts from 100 to 1000 µs.
Claim 29
Independent Claim
33 words
A method as claimed in any one of Claims 26 to
28, characterized in that said first postinjection
(AFTER) starts at least 80 µs after the end of said
second main injection (MAIN2).
Claim 30
Independent Claim
31 words
A method as claimed in any one of Claims 26 to
29, characterized in that said first postinjection
(AFTER) injects a smaller amount of fuel than said first
main injection (MAIN1).
Claim 31
Independent Claim
72 words
A method as claimed in any one of Claims 26 to
30, characterized by also comprising the step of
performing, at each engine cycle and in each cylinder (4)
of said engine (2), a second postinjection (POST)
following said first postinjection (AFTER) and starting
at an engine angle value ranging between 20° before and
210° after said top dead center position, or between 270°
and 360° after said top dead center position.
Claim 32
Dependent Claim
20 words
A method as claimed in Claim 31, characterized
in that said second postinjection (POST) lasts from 100
to 500 µs.
Claim 33
Dependent Claim
29 words
A method as claimed in Claim 31 or 32,
characterized in that said second postinjection (POST)
starts at least 280 µs after the end of said first
postinjection (AFTER).
Claim 34
Independent Claim
31 words
A method as claimed in any one of Claims 31 to
33, characterized in that said second postinjection
(POST) injects a smaller amount of fuel than said first
main injection (MAIN1).
Claim 35
Independent Claim
48 words
A method as claimed in any one of the foregoing
Claims, characterized by also comprising the step of
performing, at each engine cycle and in each cylinder (4)
of said engine (2), a second preinjection (PILOT)
preceding said first auxiliary injection (PRE) and
performed during the compression stroke.
Claim 36
Dependent Claim
36 words
A method as claimed in Claim 35, characterized
in that said second preinjection (PILOT) starts at an
engine angle value ranging between 60° before said top
dead center position and the top dead center position
itself.
Claim 37
Dependent Claim
22 words
A method as claimed in Claim 35 or 36,
characterized in that said second preinjection (PILOT)
lasts from 100 to 1000 µs.
Claim 38
Independent Claim
33 words
A method as claimed in any one of Claims 35 to
37, characterized in that said second preinjection
(PILOT) ends at least 280 µs before the start of said
first auxiliary injection (PRE).
Claim 39
Independent Claim
31 words
A method as claimed in any one of Claims 35 to
38, characterized in that said second preinjection
(PILOT) injects a smaller amount of fuel than said first
main injection (MAIN1).
References Cited (Backward Citations)
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