EP1031722A2
Expired / Lapsed
EP
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Control apparatus and method for premixed compression ignition type internal combustion engines
Assignee: Mitsubishi Fuso Truck and Bus Corp
•
Filing: 2000-02-18
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Granted: —
•
Expires: 2020-02-18
Abstract
Abstract A control apparatus for a premixed compression ignition type internal combustion engine, having a fuel injection valve (4) for supplying a fuel into a combustion chamber (1) of the engine, an operational condition detecting means for detecting the operational condition of the engine, and a fuel injection control means for controlling the fuel injection valve (4) on the basis of the results of the detection carried out by the operational condition detecting means, the fuel injection control means controlling the fuel injection valve so that the supplying of a fuel to the combustion chamber is finished at least before a piston (2) reaches a compression top dead center, the control apparatus including an air supply means for supplying pressurized air to the combustion chamber (1), and an air quantity control means for controlling the air supply means, the air quantity control means controlling a supply rate of the pressurized air so that the combustion of a gaseous mixture by self-ignition is carried out by a compression effect of the piston (2) of the engine when the piston (2) is in the vicinity of a compression top dead center. This control apparatus secures an output corresponding to the time of a high-loaded operation of the engine as the reduction of NOx is effected.
Inventors
- 👤 Yoshinori c/o Mitsubishi Jidosha K.K. Iwabuchi
- 👤 Toshitaka Yokokawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 10:18
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0002; F02D41/0007; F02B; F02B1/00; F02B1/12; F02D41/30; F02D41/3011; F02D41/3017; F02D41/3035; F02D41/38; F02D41/40; F02D41/401; F02D43/00; F02M; F02M26/00; F02M26/13; F02M26/22; F02M26/23; F02B29/00; F02B29/04; F02B29/0406; F02B3/00; F02B3/06; F02B37/00; F02B37/12; F02B37/16; F02B37/18; F02D2250/00; F02D2250/32; F02D41/0025; F02D41/0047; F02D41/0065; F02D41/0072; F02M26/02; F02M26/04; F02M26/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
181 words
A control apparatus for a premixed compression ignition type internal
combustion engine, having a fuel injection valve for supplying a fuel into a
combustion chamber (1) of the engine, an operational condition detecting means for
detecting the operational condition of the engine, and a fuel injection control means
(30) for controlling the fuel injection valve (4) on the basis of the results of the
detection carried out by the operational condition detecting means so that the
supplying of a fuel to the combustion chamber (1) is finished at least by the time a
piston has reached a compression top dead center, comprising: an air supply means for supplying pressurized air to the interior of the
combustion chamber (1), and an air quantity control means for controlling the air supply means, the air
quantity control means controlling a supply rate of the pressurized air so that the
combustion of a gaseous mixture by self-ignition is carried out by a compression
effect of the piston (2) of the engine when the piston (2) is in the vicinity of a
compression top dead center.
Claim 2
Dependent Claim
30 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 1, wherein the air supply means is formed of a
supercharger provided in the engine.
Claim 3
Dependent Claim
79 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 2, wherein the supercharger is formed of a
turbocharger (9), the turbocharger having an exhaust turbine (9b) provided in an
exhaust pipe (11) of the engine, a compressor (9a) provided in a suction pipe (10) of
the engine, and a variable nozzle vane (9c) provided on the side of the exhaust
turbine (9b), the turbocharger (9) being capable of variably controlling a
supercharging pressure.
Claim 4
Dependent Claim
44 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 2, wherein the supercharger is formed of a
mechanical supercharger operated by a driving power of the engine, the mechanical
supercharger being capable of variably controlling the supercharging pressure.
Claim 5
Dependent Claim
49 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 2, wherein the supercharger is formed of an
air supply pump for supplying pressurized air to the suction pipe of the engine or to a
portion on the downstream side of the suction pipe.
Claim 6
Dependent Claim
93 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to any of Claims 1 to 5, wherein the control apparatus
includes an inside-cylinder average excess air ratio calculating means for calculating
an average excess air ratio λ of the engine on the basis of the results of the detection
carried out by the operational condition detecting means, in which the air quantity
control means controlling the air supply means on the basis of the average excess air
ratio λ calculated by the inside-cylinder average excess air ratio calculating means.
Claim 7
Dependent Claim
127 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 6, wherein the control apparatus includes a
target excess air ratio selling means for selling the target excess air ratio λa on the
basis of the results of the detection carried out by the operational condition detecting
means, the target excess air ratio λa being set as a value which does not permit
knocking to occur, in which the air quantity control means controlling the air supply
means and having the pressurized air to the combustion chamber (1) when the
average excess air ratio λ calculated by the inside-cylinder excess air ratio calculating
means is smaller than the target excess air ratio λa set by the target excess air ratio
selling means.
Claim 8
Dependent Claim
134 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 7, wherein the air quantity control means
includes a target air pressure selling means for selling a target pressure of the
pressurized air which is supplied by the air supply means, the target air pressure
selling means sets the target pressure when the average excess air ratio λ calculated
by the inside-cylinder average excess air ratio calculating means is smaller than the
target excess air ratio λa set by the target excess air ratio setting means, in which the
air quantity control means controlling a supply pressure of the pressurized air which
is supplied by the air supply means, in such a manner that the supply pressure attains
the target pressure set by the target air pressure setting means.
Claim 9
Dependent Claim
182 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 7 or 8, wherein the air supply means is
formed of a supercharger provided in the engine, the supercharger being formed of a
turbocharger (9) including an exhaust turbine (9b) provided in the exhaust pipe (11)
of the engine, a compressor (9a) provided in the suction pipe (10) of the engine, and a
variable nozzle vane (9c) provided on the side of the exhaust turbine (9b), the
turbocharger being capable of variably controlling a supercharging pressure, the
supercharger including an exhaust bypass pipe (11a) communicating an upstream
side exhaust pipe (11) and a downstream side exhaust pipe (11) of the exhaust turbine
(9b) with each other, a suction bypass pipe (10a) communicating an upstream side
suction pipe (10) and a downstream side suction pipe (10) of the compressor (9a)
with each other, an exhaust control valve (13) for controlling the opening and closing
of the exhaust bypass pipe (11a), and a suction control valve (12) for controlling the
opening and closing of the suction bypass pipe (10a).
Claim 10
Dependent Claim
76 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 9, wherein the air quantity control means
controls at least one of the variable nozzle vane (9c), exhaust control valve (13) and
suction control valve (12) when the average excess air ratio λ calculated by the
inside-cylinder average excess air ratio calculating means is smaller than the target
excess air ratio λa set by the target excess air ratio setting means.
Claim 11
Dependent Claim
184 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 9, wherein the air quantity control means
controls the exhaust control valve (13) and suction control valve (12) in the
respective opening directions and the fuel injection control means (30) controls the
fuel injection time of the fuel injection valve (4) so that the fuel injection time is
brought close to a compression top dead center when a operational condition of the
engine is in a low-loaded condition on the basis of the results of the detection carried
out by the operational condition detecting means, and,
the air quantity control means controlling the exhaust control valve (13) and suction
control valve (12) in the respective closing directions and the fuel injection control
means (30) controlling the fret injection time of the fuel injection valve (4) so that
the fuel injection time is brought close to a compression bottom dead center when a
operational condition of the engine is in a high-loaded condition on the basis of the
results of the detection carried out by the operational condition detecting means.
Claim 12
Dependent Claim
72 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to any of Claims 7 to 11, wherein the operational
condition detecting means includes an operational history monitoring means for
monitoring the operational history of the engine, in which the target excess air ratio
setting means correcting the target excess air ratio λa on the basis of the results of a
monitoring operation of the operational history monitoring means.
Claim 13
Dependent Claim
92 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to any of Claims 7 to 12, wherein the control apparatus
includes an EGR means having a passage (14a) communicating the exhaust pipe (11)
and suction pipe (10) of the engine with each other, and a control valve (14b) for
controlling a quantity of an exhaust gas passing through the passage (14a), in which
the target excess air ratio setting means correcting the target excess air ratio λa on the
basis of the operational condition of the EGR means.
Claim 14
Dependent Claim
55 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 13, wherein the target excess air ratio setting
means sets the target excess air ratio λa to 2.0 < λ < 2.5 when the EGR means is not
operated, and to λa ≤ 2.0 when the EGR means is operated.
Claim 15
Dependent Claim
62 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to any of Claims 1 to 14, wherein the operational
condition detecting means includes an engine load detecting means for detecting an
engine load, in which the air quantity control means controlling the air supply means
in accordance with the engine load detected by the engine load detecting means.
Claim 16
Dependent Claim
58 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 15, wherein the quantity of the air control
means controls the air supply means and have the pressurized air supplied to the
interior of the combustion chamber (1) when the engine load detected by the engine
load detecting means exceeds a predetermined level.
Claim 17
Dependent Claim
215 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to any of Claims 1 to 16, wherein the operational
condition detecting means includes an engine speed sensor (22) for detecting a
rotational frequency of the engine, an engine load sensor for detecting an engine
load, an air temperature sensor (23) for detecting a temperature of the air supplied to
the interior of the combustion chamber, and an air pressure sensor (24) for detecting
a pressure of the air supplied to the interior of the combustion chamber (1), the fuel
injection control means including target fuel injection rate setting means for setting a
target fuel injection quantity on the basis of the results of the detection carried out by
the engine speed sensor and the engine load sensor, in which the air quantity control
means calculating the average excess air ratio λ of the engine on the basis of the
rotational frequency of the engine, target quantity of the fuel, temperature of the air
and pressure of the air which are detected by the engine speed sensor, the target fuel
injection rate setting means, the air temperature sensor (23) and the air pressure
sensor (24) respectively, and controlling the air supply means in accordance with this
calculated average excess air ratio λ.
Claim 18
Dependent Claim
126 words
A control apparatus for a premixed compression ignition type internal
combustion engine according to Claim 16 or 17, wherein the operational condition
detecting means includes an engine temperature sensor for detecting a temperature of
the engine, and a monitoring means for monitoring the operational history of the
engine, the air quantity control means setting the target excess air ratio λa on the
basis of the information detected by the engine temperature sensor and operational
history monitor respectively, the target excess air ratio λa being set as a value at
which knocking does not occur, the air quantity control means controlling the air
supply means and having pressurized air supplied when the calculated average excess
air ratio λ is smaller than the target excess air ratio λa.
Claim 19
Dependent Claim
117 words
A control method for a premixed compression ignition type internal
combustion engine, including: detecting the operational condition of the engine, controlling a fuel injection valve (4) on the basis of the detected operational
condition of the engine, and controlling the fuel injection valve (4) so that the
supplying of a fuel to a combustion chamber (1) is finished at least before a piston (2)
reaches a compression top dead center, supplying pressurized air to the combustion chamber (1), and controlling a supply rate of the pressurized air so as to carry out combustion
by self-ignition by a compressing effect of the piston (2) when the piston (2) is in the
vicinity of the compression top dead center.
Claim 20
Dependent Claim
61 words
A control method for a premixed compression ignition type internal
combustion engine according to Claim 19, wherein the control method includes
calculating an average excess air ratio λ of the engine on the basis of the operational
condition of the engine, and controlling a supply rate of the pressurized air on the
basis of the calculated average excess air ratio λ.
Claim 21
Dependent Claim
82 words
A control method for a premixed compression ignition type internal
combustion engine according to Claim 20, wherein the control method includes
setting the target excess air ratio λa on the basis of the operational condition of the
engine, the target excess air ratio λa being set as a value which does not permit
knocking to occur; and controlling the supply rate of the pressurized air when the
calculated average excess ratio λ is smaller than the set target excess air ratio λa.
Claim 22
Dependent Claim
52 words
A control method for a premixed compression ignition type internal
combustion engine according to any of Claims 19 to 21, wherein the control method
includes setting a target pressure of the pressurized air, and controlling a supply
pressure of the pressurized air so that the supply pressure attains the set target
pressure.
Claim 23
Dependent Claim
95 words
A control method for a premixed compression ignition type internal
combustion engine according to Claim 21 or 22, wherein the control method includes
an EGR means having a passage (14a) communicating an exhaust pipe (11) and a
suction pipe (10) of the engine with each other, and a control valve (14b) for
controlling a quantity of an exhaust gas passing through the passage (14a); the target
excess air ratio λa being set to 2.0 < λ a< 2.5 when the EGR means is not operated,
and to λa≤2.0 when the EGR means is in operation.
Claim 24
Dependent Claim
208 words
A control method for a premixed compression ignition type internal
combustion engine according to any of Claims 21 to 23, wherein the control method
includes a turbocharger (9) having an exhaust turbine (9b) provided in an exhaust
pipe (11) of the engine, a compressor (9a) provided in the suction pipe (10) of the
engine and a variable nozzle vane (9c) provided on the side of the exhaust turbine
(9b), the turbocharger (9) being capable of variably controlling a supercharging
pressure: an exhaust bypass pipe (11a) communicating the upstream side exhaust
pipe (11) and downstream side exhaust pipe (11) of the exhaust turbine (9b) with
each other; a suction bypass pipe (10a) communicating the upstream side suction
pipe (10) and downstream side suction pipe (10) of the compressor (9a) with each
other; an exhaust control valve (13) for controlling the opening and closing of the
exhaust bypass pipe (11a); and a suction control valve (12) for controlling the
opening and closing of the suction bypass pipe (10a); in which at least one of the
variable nozzle vane (9c), the exhaust control valve (13) and the suction control valve
(12) being controlled when the calculated average excess air ratio λ is smaller than
the set target excess air ratio λa.
Claim 25
Dependent Claim
124 words
A control method for a premixed compression ignition type internal
combustion engine according to any of Claims 22 to 24, wherein the exhaust control
valve (13) and suction control valve (12) are controlled in the opening direction
respectively, the fuel injection time to the combustion chamber (1) is controlled so
that is brought close to the compression top dead center when the operational
condition of the engine is in a low-loaded condition, and the exhaust control valve
(13) and suction control valve (12) are controlled in the closing direction
respectively, the fuel injection time to the combustion chamber (1) is controlled so
that is brought close to the compression bottom dead center when the operational
condition of the engine is in a high-loaded condition.
Claim 26
Dependent Claim
47 words
A control method for a premixed compression ignition type internal
combustion engine according to any of Claims 19 to 25, wherein the control method
includes detecting a load of the engine, and controlling a supply rate of the
pressurized air in accordance with the detected engine load.
Claim 27
Dependent Claim
38 words
A control method for a premixed compression ignition type internal
combustion engine according to Claim 26, wherein the supply rate of the pressurized
air is controlled when the detected engine load exceeds a predetermined level set in
advance.
References Cited (Backward Citations)
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