EP4048884A1 - Method for regulating a pressure in a water injection system for an internal combustion engine - Google Patents
Method for regulating a pressure in a water injection system for an internal combustion engineInfo
- Publication number
- EP4048884A1 EP4048884A1 EP20796806.6A EP20796806A EP4048884A1 EP 4048884 A1 EP4048884 A1 EP 4048884A1 EP 20796806 A EP20796806 A EP 20796806A EP 4048884 A1 EP4048884 A1 EP 4048884A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- water injection
- pressure
- internal combustion
- combustion engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 170
- 238000002347 injection Methods 0.000 title claims abstract description 146
- 239000007924 injection Substances 0.000 title claims abstract description 146
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 34
- 230000001276 controlling effect Effects 0.000 claims abstract description 4
- 239000000446 fuel Substances 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 2
- 230000000977 initiatory effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 7
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/025—Adding water
- F02M25/028—Adding water into the charge intakes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B47/00—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines
- F02B47/02—Methods of operating engines involving adding non-fuel substances or anti-knock agents to combustion air, fuel, or fuel-air mixtures of engines the substances being water or steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/022—Adding fuel and water emulsion, water or steam
- F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the invention relates to the field of motor vehicles with thermal engines such as cars for example.
- the invention relates more particularly to a method for regulating a pressure in a water injection system for an internal combustion engine as well as to the system implementing said method.
- the invention also relates to a motor vehicle with a thermal engine comprising a water injection system for an internal combustion engine implementing said pressure regulation method.
- the invention is intended to be used in particular in the field of injecting water into the air intake circuit of the engine of a vehicle.
- this water mixes with the intake gas and makes it possible to reduce combustion temperatures and emissions of pollutants called NO x , but also to increase the performance, for example, of a gasoline engine by reducing the knock sensitivity. It is therefore necessary to control the quality of the inlet water-gas mixture at all times.
- Patent application US2018 / 0028974 A1 discloses a process for regulating the pressure within a diesel engine exhaust gas pollution control system and therefore to better control the pollution control of said gases.
- a method has the disadvantage of being intended for a liquid exhibiting very different properties from the water used in the field of water injection for a heat engine, but also of requiring injection frequencies that are totally different from the one. process presented in application US2018 / 0028974 A1.
- an objective of the invention in at least one of its embodiments, is to implement a method making it possible to regulate the pressure within a water injection system for an internal combustion engine. able to work at high injection frequency.
- Another objective of the invention in at least one of its embodiments, is to provide a water injection system for an internal combustion engine as well as a computer program allowing the implementation of the method of pressure regulation in a water injection system for an internal combustion engine.
- Another objective of the invention in at least one of its embodiments, is to provide a vehicle comprising said water injection system for an internal combustion engine.
- the invention relates to a method of regulating a pressure in a water injection system for an internal combustion engine.
- such a method comprises the following steps:
- the general principle of the invention is based on the use of the measurement of the pressure in the water injection system, P sys , of at least one parameter of a water injection pump governing the flow rate. injection of water and at least one parameter of the internal combustion engine to determine the pressure variation required in the system to ensure the quality of the water-gas mixture intake. Said pressure variation being linked to the difference between the measured pressure, P syst , and a reference pressure, P ref .
- the reference pressure, P ref depends in particular on the characteristics of the injector, the dimensions of the injection system pipes, the air flow rate and the temperature, it corresponds to the ideal pressure for water injection. by the injector guaranteeing an optimum water-gas intake mixture.
- the invention is based on a completely new and inventive approach to implementing a method for regulating a pressure in a water injection system for an internal combustion engine making it possible to guarantee the quality of the fuel. inlet gas-water mixture. Furthermore, such a method also makes it possible to avoid excessively large fluctuations and constraints on the pump because it makes it possible to determine the pressure variation and the generation of pulses linked to the speed of the injection pump. It is possible to determine the operating speed of the pump and the energy required to compensate and stabilize the system pressure at the injector.
- the method according to the invention unlike a water injection system which only reacts to pressure variations after the opening or closing of the water injector, anticipates them by varying one or more parameters of the injection pump even before the opening or closing of the water injector to compensate for the pressure variation resulting from the opening or closing of the injector on the basis of a internal combustion engine parameter. For example, the pump flow rate is increased even before the injector opens so as to prevent the pressure in the water injection system from falling from a reference pressure. Thanks to this anticipation, the injected water flow rate is guaranteed and the quality and precision of the water-gas intake mixture is maintained.
- the method according to the invention makes it possible to limit the pressure variations in the water injection system during variations in the flow rate to be injected and also to have better metering precision.
- the pressure in the system d water injection, P syst is measured either on the injection rail or at the outlet of the water injection pump, preferably on the injection rail.
- P ref maintain the pressure in the water injection system, P syst , close to a reference pressure value, P ref
- a pressure between 80% of the reference pressure, P ref , and 120% of the reference pressure, P ref therefore such as 0.8xP ref £ Psyst £ 1, 2xP ref
- the method of regulating a pressure in a water injection system for an internal combustion engine according to the invention is such that the at least one parameter of the injection pump of water is the operating speed of the water injection pump.
- the method for regulating a pressure in a water injection system for an internal combustion engine according to the invention is such that the injection system comprises a plurality of injectors.
- the expression “plurality of injectors” is understood to denote a number of water injectors in the air intake chamber greater than or equal to 2, more preferably greater than or equal to three. More particularly, the number of water injectors is at least equal to the number of cylinders of the internal combustion engine.
- the method of regulating a pressure in a water injection system for an internal combustion engine according to the invention is such that the operating speed of the water injection pump is a rotational speed of the water injection pump.
- the method of regulating a pressure in a water injection system for an internal combustion engine according to the invention is such that the at least one parameter of the internal combustion engine is selected from among the quantity of water to be injected, the temperature of the injection chamber which is the combustion chamber of the engine in the case of a direct injection engine, the fuel injection flow rate, the engine load and the speed engine.
- the method for regulating a pressure in a water injection system for an internal combustion engine according to the invention is such that the at least one parameter of the internal combustion engine is the amount of water to inject.
- the quantity of water to be injected into a combustion chamber of the engine is obtained from information based on the load of the engine, for example the useful pressure in the combustion chamber of the engine. engine.
- the quantity of water to be injected is obtained from information based on a request for acceleration of the vehicle.
- the quantity of water to be injected is the quantity of water to be injected so as to obtain a stoichiometric air-fuel mixture in the combustion chamber of the engine.
- the term “stoichiometric mixture” is understood here to mean a mixture of which the proportion between the quantity of air and of fuel makes it possible to ensure complete combustion of the fuel.
- a stoichiometric mixture of air and gasoline to ensure complete combustion of the fuel comprises 14.5 kg of air per 1 kg of fuel.
- a stoichiometric mixture corresponds to an air-fuel equivalence ratio (“air-fuel equivalence ratio” in English terminology or “Verbrennungs Kunststoffverhàltnis” in Germanic terminology), often designated by the symbol l, equal to 1.
- air-fuel equivalence ratio in English terminology or “Verbrennungs Kunststoffverhàltnis” in Germanic terminology
- l equal to 1.
- a mixture whose air-fuel equivalence ratio is greater than 1, that is to say which contains less air than the proportion allowing total combustion is called a rich mixture.
- Such an embodiment advantageously makes it possible to reduce the number of calculations of the first electronic control unit, ECU1, and to reduce the number of calibrations because it is the at least one parameter of the engine which directly influences the opening command. closing the injector.
- the method of regulating a pressure in a water injection system for an internal combustion engine according to the invention is such that the value of the reference pressure, P ref , is: Either pre-recorded in the first electronic control unit,
- the method of regulating a pressure in a water injection system for an internal combustion engine according to the invention is such that the pressure in the water injection system, P SyS is such that it is between 90% of the reference pressure P ref, and 110% of the reference pressure P ref, therefore 0.9 x P r ef £ £ P system 1.1xP ref before the opening or closing at least one water injector of the water injection system.
- P syst makes it possible to obtain better metering precision.
- An object of the invention is a water injection system for an internal combustion engine as well as a computer program allowing the implementation of the pressure regulation method in a water injection system. for an internal combustion engine.
- the invention relates to a computer program comprising instructions which, when the program is executed by a computer, lead the latter to implement the steps of the method for regulating the pressure in a system. injection of water for an internal combustion engine according to the invention.
- the invention relates to a water injection system of an internal combustion engine suitable for implementing the method for regulating a pressure in a water injection system for an internal combustion engine according to the invention, comprising a water injector connected to a water tank, a water pressure sensor, a water injection pump, at least one water pipe connecting the water tank to the water injector and a control system consisting of at least a first electronic control unit, ECU 1.
- An object of the invention is also a motor vehicle suitable for implementing the method of regulating pressure in a water injection system for an internal combustion engine according to the invention.
- FIG. 1 is a schematic view of a water injection system of an internal combustion engine suitable for implementing the method of regulating a pressure in a water injection system for an internal combustion engine according to the invention.
- Figure 2 is a schematic representation of an embodiment of the steps of the method of regulating pressure in a water injection system for an internal combustion engine according to the invention.
- FIG. 1 shows a water injection system 1 of an internal combustion engine 2 suitable for implementing the method for regulating a pressure in a water injection system for an engine.
- internal combustion 2 according to the invention.
- the system comprises a plurality of water injectors 10, 11, 12 and 13, connected to a water tank 14, a water pressure sensor 15, a water injection pump 16, at least one water pipe 17 connecting the water tank 14 to the plurality of water injectors 10, 11, 12 and 13, and a control system composed of at least a first electronic control unit, ECU 1, 18
- the water injection pump 16 can be a piston pump or a rotary pump, preferably the water injection pump 16 is a rotary pump. In the example described here, the water injection pump 16 is located within a water injection module 19.
- the water injectors 10, 11, 12, 13 are placed on a ramp of injection 20.
- the water pressure sensor 15 is placed upstream of the injection rail 20.
- the parameters linked to the water injection pump 16, preferably the operating speed of the injection pump d the water 16, and the pressure in the water injection system, P syst , measured by the pressure sensor 15, are transmitted to the first electronic control unit, ECU 1, 18.
- the first electronic control unit, ECU 1, 18, is connected to a second electronic control unit, ECU 2, 21.
- the second electronic control unit, ECU 2, 21 receives engine parameters such as the amount of water to be injected, the temperature of injection chamber, fuel injection flow, engine load and engine speed and transmits at least one of these parameters to the first one control unit, ECU 1, 18.
- FIG. 2 shows an embodiment of the method for regulating a pressure in a water injection system 1 for an internal combustion engine 2 according to the invention.
- the method comprises a measurement step 22, by sensors controlled by a first electronic control unit, ECU 1, 18, the evolution of the pressure in the water injection system, P sys , and at least a parameter of a water injection pump 16 governing the water injection flow rate, preferably the parameter of the water injection pump 16 is the operating speed of the water injection pump 16.
- the method also comprises a recording step 23 by the first electronic control unit 18, ECU 1, of at least one parameter of the internal combustion engine 2 coming from a second electronic control unit, ECU 2, 21, preferably the at least one parameter of the combustion engine 2 is selected from the quantity of water to be injected, the temperature of the injection chamber, the fuel injection flow rate, the engine load and the engine speed, more preferably said at least one parameter of the combustion engine 2 is the quan amount of water to be injected.
- the method further comprises an engagement step 24, before the opening or closing of at least one water injector 10, 11, 12, 13 of the water injection system 1, a variation of said at least a parameter of the water injection pump 16 so as to maintain the pressure in the water injection system, P sys , close to a reference pressure value, P ref .
- This reference pressure being either pre-recorded in the first electronic control unit 18, ECU 1; either predetermined, on the basis of data from the sensors controlled by the first electronic control unit 18, ECU 1, by an iteration calculation based on the measurement of at least one parameter, said parameter being selected from the operating speed of the pump injection, preferably the speed of rotation of the injection pump, the quantity of water to be injected, the temperature of the injection chamber, the fuel injection flow rate, the engine load and the engine speed, preferably said parameter being selected from the quantity water to be injected, the temperature of the injection chamber, the fuel injection rate, the engine load and the engine speed.
- the pressure in the water injection system, P SySt is such that it is between 80% of the reference pressure, P ref , and 120% of the reference pressure, P ref , therefore such as 0 , 8XP ref £ £ Psyst 1,2xP ref, preferably between 90% of the reference pressure P ref, and 110% of the reference pressure P ref, so 0.9xP ref Psyst £ £ 1.1 x Pr and - where the pressure in the system, P syst , is equal to or close to zero as in the case of a vehicle when starting for example, there will be no opening of the injectors 10, 11, 12 and 13, the pressure in the system, P syst , deviating too much from the reference pressure, P ref .
- the method comprises a step of controlling the opening or closing of at least one water injector 10, 11, 12, 13 of the water injection system 1 on the basis of said at least one parameter. internal combustion engine 2.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1911995A FR3102512B1 (en) | 2019-10-25 | 2019-10-25 | Method for regulating pressure in a water injection system for an internal combustion engine |
PCT/EP2020/080044 WO2021078998A1 (en) | 2019-10-25 | 2020-10-26 | Method for regulating a pressure in a water injection system for an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4048884A1 true EP4048884A1 (en) | 2022-08-31 |
Family
ID=69375543
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20796806.6A Pending EP4048884A1 (en) | 2019-10-25 | 2020-10-26 | Method for regulating a pressure in a water injection system for an internal combustion engine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4048884A1 (en) |
FR (1) | FR3102512B1 (en) |
WO (1) | WO2021078998A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2615733A (en) * | 2021-12-16 | 2023-08-23 | Borgwarner Luxembourg Automotive Systems S A | Method of operating a water injection system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015208474A1 (en) * | 2015-05-07 | 2016-11-10 | Robert Bosch Gmbh | Device for injecting water of an internal combustion engine and method for operating such a device |
DE102015208509A1 (en) * | 2015-05-07 | 2016-11-10 | Robert Bosch Gmbh | Method for operating a device for injecting water into an internal combustion engine |
US10166509B2 (en) | 2016-07-29 | 2019-01-01 | Robert Bosch Gmbh | Systems and method for feed forward control of diesel exhaust fluid delivery systems |
EP3721069A1 (en) * | 2017-12-08 | 2020-10-14 | Eneria | Device for reducing the quantity of emitted nitrogen oxides of a diesel engine |
DE102018201152A1 (en) * | 2018-01-25 | 2019-07-25 | Hitachi Automotive Systems, Ltd. | Injection method for a non-combustible fluid for an internal combustion engine |
DE102018101773B4 (en) * | 2018-01-26 | 2019-11-14 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Method and device for water injection |
-
2019
- 2019-10-25 FR FR1911995A patent/FR3102512B1/en active Active
-
2020
- 2020-10-26 WO PCT/EP2020/080044 patent/WO2021078998A1/en unknown
- 2020-10-26 EP EP20796806.6A patent/EP4048884A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2021078998A1 (en) | 2021-04-29 |
FR3102512A1 (en) | 2021-04-30 |
FR3102512B1 (en) | 2022-05-13 |
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