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Title:
METHOD TO CONTROL THE COMBUSTION OF A COMPRESSION IGNITION INTERNAL COMBUSTION ENGINE WITH REACTIVITY CONTROL THROUGH THE INJECTION TEMPERATURE
Document Type and Number:
WIPO Patent Application WO/2017/009799
Kind Code:
A4
Abstract:
Method to control the combustion of a compression ignition engine (1) with reactivity control through the injection temperature; the control method provides for the steps of: establishing a quantity (Q) of fuel to be injected into a cylinder (2); injecting a first fraction (F1) of the quantity (Q) of fuel fed by a first feed system without active heating devices, preferably equal to at least 70% of the quantity (Q) of fuel, at least partially during the intake and/or compression stroke; injecting a second fraction (F2) of the quantity (Q) of fuel fed by a second feed system provided with at least one active heating device (12; 13), and equal to the remaining fraction of the quantity (Q) of fuel, into the cylinder (2) at the end of the compression stroke and preferably at no more than 60° from the top dead centre (PMS); and heating the second fraction (F2) of the quantity (Q) of fuel to an injection temperature (T) of over 100°C, before injecting the second fraction (F2) of the quantity (Q) of fuel.

Inventors:
MARMORINI, Luca (Località Gello 8, Arezo, 52100, IT)
Application Number:
IB2016/054211
Publication Date:
March 09, 2017
Filing Date:
July 14, 2016
Export Citation:
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Assignee:
MARMORINI LUCA DITTA INDIVIDUALE (Località Gello 8, Arezo, 52100, IT)
International Classes:
F02D41/30; F02B23/06; F02D35/02; F02D41/40; F02M31/125; F02M53/02; F02M53/06; F02D19/06; F02M27/08
Attorney, Agent or Firm:
MACCAGNAN, Matteo et al. (Via Viotti 9, Torino, 10121, IT)
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Claims:
AMENDED CLAIMS

received by the International Bureau on 16.01.2017

CLAIMS 1. A method to control the combustion of a compression ignition internal combustion engine (1) with reactivity control through the injection temperature; the internal combustion engine (1) is provided with at least one piston (7), which slides, with a reciprocating motion, on the inside of a cylinder (2), so as to carry out a succession of combustion cycles, each comprising at least an intake stroke and a compression stroke; the control method comprises the steps of:

establishing, for each combustion cycle, a quantity (Q) of fuel to be injected into the cylinder (2); and

injecting a first fraction (Fl) of the quantity (Q) of fuel at least partially during the intake and/or compression stroke; injecting a second fraction (F2) of the quantity (Q) of fuel, which is equal to the remaining fraction of the quantity (Q) of fuel, into the cylinder (2) at the end of the compression stroke; and

heating the second fraction (F2) of the quantity (Q) of fuel to an injection temperature (T) of over 100°, before injecting the second fraction (F2) of the quantity (Q) of fuel;

the control method is characterised in that:

the first fraction (Fl) is injected by means of a first fuel injector (9; 11) that receives the fuel from a first feed system without active heating devices so that the fraction (Fl) of the quantity (Q) of fuel has a temperature below the injection temperature (T) ; and

the second fraction (F2) of the quantity (Q) of fuel is injected by means of a second fuel injector (8) that is different and independent from the first fuel injector (9; 11) , injected directly into the cylinder (2), and receives the fuel from a second feed system that is separate and independent from the first feed system and wherein the second feed system is provided with at least one active heating device (12; 13) that is operated to give the fuel the injection temperature (T)

2. A method to control an internal combustion engine (1) according to claim 1, wherein the fuel, at room temperature, has a cetane number below 30 and, at the injection temperature (T) ranging from 100° to 420°C, has a reactivity corresponding to a cetane number exceeding 40-45.

3. A method to control an internal combustion engine (1) according to claim 1 or 2, wherein the first fuel injection (9) injects outside the cylinder into an intake pipe (10) of the cylinder ( 2 ) .

4. A method to control an internal combustion engine (1) according to claim 1 or 2, wherein the first fuel injector (11) injects directly into the cylinder (2) .

5. A method to control an internal combustion engine (1) according to claim 4, wherein:

the second fuel injector (8) and the first fuel injector (11) both lead into the top end of the cylinder (2) so as to inject centrally into the combustion chamber (C) ; and

the second fuel injector (8) and the first fuel injector (11) both are arranged next to one another.

6. A method to control an internal combustion engine (1) according to claim 4, wherein the first fuel injector (11) leads into a lateral wall of the cylinder (2) so as to lead into the combustion chamber (C) in a lateral position.

7. A method to control an internal combustion engine (1) according to any of the claims from 1 to 6, wherein the heating device (12) is coupled to the second fuel injector (8) . 8. A method to control an internal combustion engine (1) according to a claim from 1 to 6, wherein the heating device (13) is arranged downstream from a feeding pump (14) and upstream from the second fuel injector (8) .

9. A method to control an internal combustion engine (1) according to claim 8, wherein:

the internal combustion engine (1) comprises an exhaust gas recirculation system (EGR) provided with an (EGR) pipe; and the heating device (13) is provided with a heat exchanger (13A), which uses part of the heat from the exhaust gases flowing through the (EGR) pipe to heat the second fraction (F2) of the quantity (Q) of fuel, and with an electric heater (13B) .

10. A method to control an internal combustion engine' (1) according to claim 8 or 9, wherein a common rail (15) is provided, which feeds fuel under pressure to the second fuel injector (8), and the heating device (13) is arranged upstream from the common rail (15) .

11. A method to control an internal combustion engine (1) according to claim 7, wherein:

the second fuel injector (8) comprises a main body (17), which houses an actuator (18) moving a plunger (19) and a spray tip (20) housing the end part of the plunger (19) , and an injection valve (21), which is controlled by the movement of the plunger (19) ; and

the heating device (12) is arranged in the area of the spray tip (20) of the second fuel injector (8).

12. A method to control an internal combustion engine (1) according to claim 11, wherein the heating device (12) heats the spray tip (20) of the second fuel injector (8), which, in turn, heats by conduction the fuel flowing through the spray tip (20) .

13. A method to control an internal combustion engine (1) according to claim 11, wherein the heating device (12) generates electromagnetic waves, which interact with the fuel flowing through the spray tip (20) of the second fuel injector (8), so as to heat the fuel.

14. A method to control an internal combustion engine (1) according to any of the claims from 1 to 13, wherein the second fraction (F2) of the quantity (Q) of fuel is injected into the cylinder (2) at the end of the compression stroke and at no more than 60° from the top dead centre (TDC) . 15. A method to control an internal combustion engine (1) according to one of the preceding claims, wherein the first fraction (Fl) of the quantity (Q) of fuel is injected partly during the intake stroke and, for the remaining part, during the compression stroke, and preferably within 60° to 100° from the top dead centre (TDC) .

16. A method to control an internal combustion engine (1) according to any of the claims from 1 to 15, wherein the internal combustion engine (1) is not provided with a spark plug and the fuel spontaneously self-ignites on the inside of the cylinder (2) at the end of the compression stroke.