EP3117085A1 - Moteur a combustion de véhicule automobile à désactivation de cylindre - Google Patents
Moteur a combustion de véhicule automobile à désactivation de cylindreInfo
- Publication number
- EP3117085A1 EP3117085A1 EP15709259.4A EP15709259A EP3117085A1 EP 3117085 A1 EP3117085 A1 EP 3117085A1 EP 15709259 A EP15709259 A EP 15709259A EP 3117085 A1 EP3117085 A1 EP 3117085A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- torque
- cylinders
- active
- achievable
- recovery test
- 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.)
- Withdrawn
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
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
- F02D2200/1004—Estimation of the output torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/1502—Digital data processing using one central computing unit
- F02P5/1504—Digital data processing using one central computing unit with particular means during a transient phase, e.g. acceleration, deceleration, gear change
Definitions
- the invention relates to motor vehicle combustion engines when such engines are equipped with a combustion cylinder (s) deactivation system.
- the invention lies in the technical field of the combustion control system of an engine including spark ignition, and more specifically the strategy to build the selective injection cut cylinder.
- the torque setpoint received by the engine can become so low that the engine can no longer respect it.
- the motor control uses different levers.
- the degradation of the ignition advance decreases the efficiency of the engine and therefore the torque produced.
- This lever is used for bright transient phases because it has a fast dynamic.
- the solution is to minimize the engine air supply by closing the butterfly for example.
- This lever has a rather slow dynamic due to the control of the actuators, the throttle body in this case and because of the dynamics of the air. But these actions, which can be combined, are not always sufficient to monitor the torque setpoint sent to the engine.
- the lever on the air branch alone can not be used, because its potential for degradation of the torque is high but its dynamics is weak. This has the impact of having a poor follow-up of the couple and a quality of change of report degraded, even a bad feeling for the customer.
- the degradation of ignition advances offers a rather low potential on the torque, but a very high dynamic and here too, torque tracking is not always ensured, with the impacts seen above.
- the other disadvantage of this lever is that it greatly degrades the efficiency of the engine which generates high thermal stress with an increase in exhaust temperature with risk of breakage.
- the cylinder selective injection cutoff therefore provides additional leverage during a very dynamic torque reduction request.
- anti-pollution standards and the wish to limit the consumption of engines as far as possible lead car manufacturers to resort to "downsizing", the English expression American for "decrease in size” in French, that is to say, the production of low-capacity engines with a decreasing number of cylinders.
- the engine is then very loaded, which creates "dead zones" of torque in the engine field, between operation with all the cylinders injecting and with a cylinder cut for example.
- the object of the present invention is to set up a strategy to request the injection cut of one or more cylinders with the advantage of improving torque monitoring by a better torque potential achievable and dynamic equivalent to that of the advance branch.
- a goal is also to reduce the gas flow output of the engine and thus better contain the exhaust temperature.
- a combustion control method of a motor vehicle combustion engine comprising a plurality of combustion cylinders, the method comprising the step of reducing the number of active cylinders. in the event of a decrease in target torque, characterized in that it comprises a recovery test step which recovery test step consists in evaluating firstly whether an operation with a less active cylinder has a maximum attainable maximum torque. the minimum torque achievable with the current number of active cylinders and secondly to evaluate if the setpoint torque is lower than the minimum torque achievable with the current number of cylinders and if this recovery step reduce the number of cylinders assets.
- the method comprises, in the negative of the recovery test step, the additional step of evaluating whether the setpoint torque is less than the maximum torque achievable with a less active cylinder and reducing the number of active cylinders in the affirmative of this assessment.
- the method comprises a recovery test step which recovery test step consists in evaluating firstly whether an operation with an active cylinder in addition has a minimum attainable torque lower than the maximum torque achievable with the number of current active cylinders and secondly to evaluate whether the setpoint torque is greater than the maximum torque achievable with the number of active cylinders current and if so this recovery test step increase the number of active cylinders.
- the method comprising, in the negative of the recovery test step, the additional step of evaluating whether the target torque is greater than the maximum achievable torque with the current number of cylinders and increase the number of active cylinders in the affirmative of this evaluation.
- the invention also relates to a motor vehicle combustion engine comprising a plurality of combustion cylinders and a combustion control module configured to reduce the number of active cylinders in the event of a decrease in target torque, characterized in that the control module is configured to carry out an overlap test, which recovery test consists of evaluating whether operation with a less active cylinder has a maximum achievable torque greater than the minimum achievable torque with the number of active cylinders present and to further evaluate if the setpoint torque is lower than the minimum achievable torque with the current active cylinder number and the module is configured to reduce the number of active cylinders in the affirmative of this recovery test step.
- an overlap test which recovery test consists of evaluating whether operation with a less active cylinder has a maximum achievable torque greater than the minimum achievable torque with the number of active cylinders present and to further evaluate if the setpoint torque is lower than the minimum achievable torque with the current active cylinder number and the module is configured to reduce the number of active cylinders in the affirmative of this recovery test step.
- control module is configured such that, in the negative of the recovery test step, the module evaluates whether the setpoint torque is lower than the maximum achievable torque with a less active cylinder and reduces the number of active cylinders in the affirmative of this evaluation.
- the module is configured to carry out an overlap test which consists in evaluating firstly whether an operation with an active cylinder in addition has a minimum achievable torque lower than the maximum achievable torque with the number of active cylinders present and to evaluate on the other hand if the target torque is greater than the maximum torque achievable with the current number of active cylinders and the module is configured to increase the number of active cylinders in the affirmative of this recovery test.
- control module is configured such that, in the negative of the recovery test step, it evaluates whether the setpoint torque is greater than the maximum achievable torque with the number of active cylinders present and the module increases the number of active cylinders in the affirmative of this evaluation.
- control module is configured to perform a phase advance change ignition before a reduction or an increase in the number of active cylinders.
- the engine is a spark ignition engine.
- the torque on n rolls covers the one on n-1 cylinder in the case of a cut or respectively n + 1 cylinders in the case of an injection reactivation, it is called "covering area".
- the torque setpoint becomes very low to the point of being less than the minimum torque achievable with four cylinders, so the strategy requires the injection cut of a cylinder. If subsequently, the torque setpoint still decreases, another cylinder can be cut, until reaching the limit of cylinders allowed to be cut.
- the system requests the selective injection cut on one or more cylinders when the torque setpoint requested from the motor on the advance branch can no longer be followed.
- step 1 the motor control provides a cutting instruction Ccons.
- step 2 the motor control performs a test to test if the torque setpoint Ccons is less than the minimum torque achievable with four cylinders and to test whether the minimum torque achievable with four cylinders and less than the maximum torque achievable with three cylinders.
- step 3 the engine control module controls the cutting of a cylinder.
- the cut cylinder can be a fixed cylinder or the cut can be a rotating cut, that is to say that the cut cylinder can be different at each combustion cycle of the engine.
- the motor control performs, in step 4, a test consisting of examining whether the target torque is less than the maximum torque with three cylinders. If this is the case, then step 3 consisting of reducing the number of active cylinders is carried out.
- the tests are then carried out in parallel and in a repetitive manner consisting respectively in examining whether the setpoint torque is greater than the maximum torque with three cylinders and whether, on the contrary, the setpoint torque is lower than the minimum torque on three cylinders.
- step 5 if the setpoint torque Ccons is lower than the minimum torque achievable with three cylinders and the minimum torque achievable with three cylinders is less than the maximum torque achievable with two cylinders, then in step 6 a cylinder is disabled. If one of these two conditions is not fulfilled, then in step 7 the motor control examines whether the setpoint torque is lower than the maximum torque on two cylinders. If this is the case, then the step referenced 6 of cutting a cylinder is carried out.
- step 8 If it turns out in step 8 that the target torque is greater than the maximum torque achievable with three cylinders and that the maximum torque achievable with three cylinders is greater than the minimum torque achievable with four cylinders, then in step 9 an additional cylinder is made active. If one of these two conditions is not fulfilled, then in step 10 it is examined whether the setpoint torque Ccons is greater than the maximum torque achievable with three cylinders. If this is the case, then step 9 of reactivating a cylinder is performed.
- the present strategy therefore calculates in real time the achievable torque once a cylinder cut or respectively a cylinder more, and prohibits the cut-off instruction, respectively of reactivation of a cylinder, when the engine torque setpoint is in a so-called "dead" engine torque zone.
- This strategy therefore monitors beforehand the torque achievable by the heat engine and requires the cut-off, or the delivery, of injection of one or more cylinders when the engine is no longer able to follow a torque setpoint that has become too low, respectively too high. in case of delivery of a cylinder.
- the engine control therefore has a torque monitoring system that can be reached in the event of a cutoff or delivery of the injection.
- This strategy therefore makes it possible to monitor in real time the achievable torque during a cutoff or selective injection delivery.
- the monitoring of the achievable torque makes it possible in particular to avoid situations of sloshing of the injection cut-off setpoint because the system is in a dead zone of torque.
- the proposed strategy improves the torque monitoring by the engine during life situations with very high dynamics that can be critical for the engine itself and consumer systems such as the gearbox or actuators. anti-skating with the impact of a bad feeling by the customer, or even a risk to his safety.
- this strategy provides a gain in torque tracking by allowing high dynamics combined with high torque reduction potential. It also brings a gain in terms of protection of the engine because the degradation of advance ignition is less and as the injection is cut on one or more cylinders, the exhaust gas flow is lower, which decreases the exhaust gas temperature.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1451985A FR3018549B1 (fr) | 2014-03-11 | 2014-03-11 | Moteur a combustion de vehicule automobile a desactivation de cylindre |
| PCT/FR2015/050374 WO2015136171A1 (fr) | 2014-03-11 | 2015-02-16 | Moteur a combustion de véhicule automobile à désactivation de cylindre |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3117085A1 true EP3117085A1 (fr) | 2017-01-18 |
Family
ID=50829144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15709259.4A Withdrawn EP3117085A1 (fr) | 2014-03-11 | 2015-02-16 | Moteur a combustion de véhicule automobile à désactivation de cylindre |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3117085A1 (fr) |
| CN (1) | CN106103949B (fr) |
| FR (1) | FR3018549B1 (fr) |
| WO (1) | WO2015136171A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3036737B1 (fr) * | 2015-06-01 | 2019-06-21 | Psa Automobiles Sa. | Procede de desactivation de cylindres d’un moteur a combustion |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6098592A (en) * | 1995-10-07 | 2000-08-08 | Robert Bosch Gmbh | Process and device for controlling an internal combustion engine |
| JP3915771B2 (ja) * | 2003-11-07 | 2007-05-16 | トヨタ自動車株式会社 | 機関出力トルク参照式多気筒内燃機関減筒制御装置 |
| US7044101B1 (en) * | 2005-02-24 | 2006-05-16 | Daimlerchrysler Corporation | Method and code for controlling reactivation of deactivatable cylinder using torque error integration |
| US9002550B2 (en) * | 2007-07-02 | 2015-04-07 | GM Global Technology Operations LLC | Use of torque model at virtual engine conditions |
| US7757666B2 (en) * | 2007-11-05 | 2010-07-20 | Gm Global Technology Operations, Inc. | Cylinder fueling coordination for torque estimation and control |
| US8887692B2 (en) * | 2011-02-14 | 2014-11-18 | GM Global Technology Operations LLC | Systems and methods for decreasing torque fluctuations during cylinder deactivation and reactivation |
| DE112012001021T5 (de) * | 2011-02-28 | 2013-12-19 | Cummins Intellectual Property, Inc. | System und Verfahren der Zylinderdeaktivierung für einen optimalen Motordrehmoment-Geschwindigkeit-Kennfeld-Betrieb |
| FR2992026A1 (fr) * | 2012-06-13 | 2013-12-20 | Peugeot Citroen Automobiles Sa | Procede de commande d'un moteur a combustion interne multicylindres |
-
2014
- 2014-03-11 FR FR1451985A patent/FR3018549B1/fr active Active
-
2015
- 2015-02-16 EP EP15709259.4A patent/EP3117085A1/fr not_active Withdrawn
- 2015-02-16 WO PCT/FR2015/050374 patent/WO2015136171A1/fr not_active Ceased
- 2015-02-16 CN CN201580013537.4A patent/CN106103949B/zh not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN106103949B (zh) | 2019-11-15 |
| WO2015136171A1 (fr) | 2015-09-17 |
| CN106103949A (zh) | 2016-11-09 |
| FR3018549A1 (fr) | 2015-09-18 |
| FR3018549B1 (fr) | 2016-04-01 |
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Effective date: 20160901 |
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| AX | Request for extension of the european patent |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHEEN-VASSEUR, GREGORY Inventor name: SOUQUET, ROMAIN Inventor name: CHARRIER, JEAN LOUIS |
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| DAX | Request for extension of the european patent (deleted) | ||
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PSA AUTOMOBILES SA |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
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| 17Q | First examination report despatched |
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| 18D | Application deemed to be withdrawn |
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