EP0964988A1 - Procede de regulation de la richesse d'un moteur thermique a injection indirecte - Google Patents
Procede de regulation de la richesse d'un moteur thermique a injection indirecteInfo
- Publication number
- EP0964988A1 EP0964988A1 EP98912542A EP98912542A EP0964988A1 EP 0964988 A1 EP0964988 A1 EP 0964988A1 EP 98912542 A EP98912542 A EP 98912542A EP 98912542 A EP98912542 A EP 98912542A EP 0964988 A1 EP0964988 A1 EP 0964988A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- petrol
- volume
- engine
- richness
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/047—Taking into account fuel evaporation or wall wetting
Definitions
- the invention relates to a method of regulating the richness of an internal combustion engine, with electronically controlled ignition and injection, by correcting the phenomenon known as wetting of the walls appearing in the case of an indirect injection of fuel into the cylinders.
- the richness regulation which is the ratio between the quantity of air admitted and the quantity of fuel injected, is intended to control the richness of the injected mixture to a variable richness set according to the engine operating conditions, even in the case of transient phases.
- it is necessary to regulate the richness of the mixture according to the operating conditions. of the engine and its aging.
- FIG. 1 is a schematic section of the duct d admission air-fuel mixture in the vicinity of a cylinder.
- the injection system described comprises in particular a richness correction loop by a PID (Proportional Integral Differential) algorithm whose coefficients are calibrated by taking account of the theoretical response of wall wetting.
- the formulation of wetting consists in calculating the quantity of fuel to be injected from the values obtained by calibration, the quantity of fuel injected entering directly into the cylinder and the volume of the film entering the cylinder.
- the invention consists in correcting the physical presence of the fuel film on the internal wall of the intake duct in order to obtain the quantity of fuel actually injected into each cylinder ensuring the control of the richness of the mixture.
- the object of the invention is a method of regulating the richness of an internal combustion engine, with at least one combustion chamber, a collecting circuit having an internal wall, means for injecting gasoline. placed in this collector, an electronic computer controlling the ignition and injection of the engine as a function of operating parameters, characterized in that it takes into account the physical phenomenon of wetting of the internal wall of the conduit admission by a petrol film by adding a correction C VF (n) to the nominal quantity of petrol Q norn (n), allowing the monitoring of a richness setpoint set by the electronic computer, to obtain the quantity of petrol actually injected Q • • (n) by the injectors in the cylinders, at an instant (n): Q inj (n) " Q name (n) + c v F (n) '
- Cy F (n) being proportional to the difference between the volume of the film V FS (n) under stabilized conditions and the volume of the film V FT (n) under transient conditions:
- C VF (n) F (n) * [V FS (n) - V p ⁇ (n)]
- V FS (n) being a proportionality coefficient, obtained by calibration, and in that the volume V FS (n) of the film deposited under stabilized conditions is proportional to the quantity of nominal gasoline Q nom (n) :
- V FS (n) G n x Q name (n),
- G (n) being a proportionality coefficient of the gain type, obtained by calibration, and in that the volume v F r p of the petrol film in transient conditions, at time n, is equal to the volume v ' FS ( n) of the stabilized film filtered at the previous instant (n-1).
- FIG. 1 is a schematic section of the intake duct of the air-fuel mixture in the vicinity of a cylinder, are:
- the quantity of petrol which must be injected into each cylinder in order to follow the richness setpoint must correspond to variations in the operating parameters of the engine, such as the manifold pressure p co - ⁇ , I th regime N, the water temperature ⁇ water ' etc • ' • *
- This quantity of fuel injected called nominal name / corresponding to the monitoring of the richness setpoint R c in the theoretical absence of the wetting phenomenon , must undergo a correction which transforms it into the quantity of effective gasoline injected Q ⁇ n •
- Q_ n is added taking into account the physical phenomenon of wetting of the walls to obtain the quantity of gasoline Q C vl actually introduced in the cylinder which effectively monitors the wealth setpoint.
- FIG. 3 is the detailed diagram of the process for regulating the richness of the air-petrol mixture according to the invention, with the loop for correcting the quantity of petrol to be injected.
- the quantity of petrol which must be effectively injected into each cylinder Q j _ n (n), n being a recurrence index linked to the operation of the engine, such as a top dead center or an engine cycle, is equal to the sum of the quantity of nominal petrol Q name (n) to be injected to follow the richness setpoint according to the engine parameters, and the correction C VF (n) mentioned previously according to equation E,:
- This correction according to the invention is based on the evaluation of the quantity of gasoline of the film on the wall under stabilized engine operating conditions V FS on the one hand and in transient conditions V FT on the other hand, relative at the same operating point.
- V FS the quantity of gasoline of the film on the wall under stabilized engine operating conditions
- V FT transient conditions
- the quantity of gasoline V FS corresponding to the volume of the film deposited on the internal wall of the duct, under stabilized conditions is proportional to the quantity of gasoline to be injected to follow the richness setpoint as a function of the engine parameters, according to equation E 2 :
- V FS (n) G (n) * Q n ⁇ m ( n ) '
- G (n) being a proportionality coefficient of the gain type, obtained by calibration.
- This correction C VF (n) is then proportional to the difference between the volume of the film V FS (n) under stabilized conditions and the volume of the film V FT (n) under transient conditions:
- C vp (n) F (n ) * [V FS (n) - V FT (n)]
- V FS (n) V ' FS (nl) + F (n) * [V FS (n) - V ps (n-1)]
- V FT (n) V ' FS (nl).
- Each value of the filtered volume V FS must be memorized for the calculation of the next value of the volume V FT in transient mode.
- the coefficient F (n) is similar to a filtering factor in the calculation of the filtered volume under stabilized conditions V ' FS (n), but also to a gain in the final calculation of the correction C VF (n) to be applied to the nominal quantity of petrol Q name ( n ) •
- the model chosen to represent the physical phenomenon of wetting the walls of the intake duct consists in defining on the one hand, from the quantity of petrol injected -; n -; (n), at time n of the engine running, a fraction ⁇ (n) which enters directly into each cylinder, the fraction [1 - (n)] of this same quantity Qi n -i (n) constituting the quantity of petrol which feeds the film which is deposited at every moment n.
- ⁇ (n) which tears off the wall and enters each cylinder, in particular by runoff.
- V FS (n) la (n) * Q in (n) 6 FS ⁇ (n) in
- the phenomenon of wetting of the walls is exactly corrected, whatever the variation of the terms ⁇ (n) and ⁇ (n) with the index n, insofar as the model describes exactly the dynamics of the phenomenon physical.
- the formulation of the additive correction C VF (n) applied to the nominal quantity of petrol to obtain the monitoring of the richness setpoint supports any setting of the terms ⁇ (n) and 3 (n) according to the operating parameters of the engine in transient phases of the opening of the air intake throttle valve, in transient engine speed phases, when the gearbox ratio changes and the richness setpoint.
- This correction as a function of the wetting of the walls has the advantage of being able to define the injection time flexibly, while being able to intervene differently in the other regulations or corrections made by the computer.
- the quantity of petrol added or subtracted during an evolution of the engine parameters between two given states 1 and 2 is strictly equal to the variation in the volume of petrol of the film deposited on the walls, under stabilized conditions, between the two states: 2
- a particular nonlimiting example of application of the method according to the invention to a four-cylinder engine consists in considering the quantity of nominal petrol Q nom proportional to the predicted manifold pressure, from the measurement delivered by a pressure sensor and taking into account the response time of the electronic acquisition chain, as explained in patent application FR 93 10137 published under the number 2 709 151 and to be chosen as dependency parameters for the coefficients G (n) and F (n), the predicted manifold pressure, the engine speed and the engine water temperature.
- This parameterization is more flexible and more complete than the parameterizations proposed in the prior art.
- the coefficients G (n) and F (n) are calculated from five variable maps, the manifold pressure and the engine speed between 0 ° C and 80 ° C, and an additional table depending on the temperature of water between - 40 ° C and + 120 ° C.
- FIGS. 5a and 5b show the variation in the richness of the air-fuel mixture as a function of variations in the pressure in the manifold p co ⁇ _ r, all else being equal respectively without and with the regulation method according to the invention.
- a second particular, nonlimiting example of application of the same process consists in considering the quantity of nominal gasoline Q norn proportional to the flow of reconstituted air, taking into account the engine filling, the air temperature and the predicted manifold pressure. .
- the dependence parameters for the coefficients F (n) and G (n) are the predicted manifold pressure, the engine speed and the water temperature. Between 0 ° C and 80 ° C air temperature, the coefficients F (n) and G (n) are calculated from five maps with the predicted manifold pressure and engine speed as variables.
- the indifference vis-à-vis the parametrization allows a great flexibility of the correction of the wetting without changing the layout and the calculation mode, but only by the evolution of the definition of the gain and the filtering.
- the volume of the film is each time explicitly calculated.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9702232 | 1997-02-25 | ||
FR9702232A FR2760045B1 (fr) | 1997-02-25 | 1997-02-25 | Procede de regulation de la richesse d'un moteur thermique a injection indirecte |
PCT/FR1998/000364 WO1998038424A1 (fr) | 1997-02-25 | 1998-02-25 | Procede de regulation de la richesse d'un moteur thermique a injection indirecte |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0964988A1 true EP0964988A1 (fr) | 1999-12-22 |
EP0964988B1 EP0964988B1 (fr) | 2002-05-29 |
Family
ID=9504147
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98912542A Expired - Lifetime EP0964988B1 (fr) | 1997-02-25 | 1998-02-25 | Procede de regulation de la richesse d'un moteur thermique a injection indirecte |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0964988B1 (fr) |
DE (1) | DE69805609T2 (fr) |
FR (1) | FR2760045B1 (fr) |
WO (1) | WO1998038424A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3097013B1 (fr) | 2019-06-05 | 2021-05-07 | Renault | Procédé de commande d’un moteur à injection indirecte |
CN113217248B (zh) * | 2021-06-02 | 2022-08-16 | 江门市大长江集团有限公司 | 摩托车、喷油量控制方法与设备、计算机可读存储介质 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2550014B2 (ja) * | 1984-11-26 | 1996-10-30 | 株式会社日立製作所 | エンジンの燃料噴射制御方法 |
JP2512787B2 (ja) * | 1988-07-29 | 1996-07-03 | 株式会社日立製作所 | 内燃機関のスロットル開度制御装置 |
JPH02227532A (ja) * | 1989-02-28 | 1990-09-10 | Fuji Heavy Ind Ltd | 燃料噴射制御装置 |
GB9222328D0 (en) * | 1992-10-23 | 1992-12-09 | Lucas Ind Plc | Method of and apparatus for fuelling an internal combustion engine |
JP3562026B2 (ja) * | 1995-05-18 | 2004-09-08 | 日産自動車株式会社 | エンジンの空燃比制御装置 |
-
1997
- 1997-02-25 FR FR9702232A patent/FR2760045B1/fr not_active Expired - Lifetime
-
1998
- 1998-02-25 DE DE69805609T patent/DE69805609T2/de not_active Expired - Lifetime
- 1998-02-25 WO PCT/FR1998/000364 patent/WO1998038424A1/fr active IP Right Grant
- 1998-02-25 EP EP98912542A patent/EP0964988B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9838424A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2760045B1 (fr) | 1999-04-16 |
EP0964988B1 (fr) | 2002-05-29 |
WO1998038424A1 (fr) | 1998-09-03 |
DE69805609D1 (de) | 2002-07-04 |
FR2760045A1 (fr) | 1998-08-28 |
DE69805609T2 (de) | 2002-11-28 |
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