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
  • F02D41/30—Controlling fuel injection
  • F02D41/38—Controlling fuel injection of the high pressure type
  • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
  • F02D41/402—Multiple injections
  • F02D41/405—Multiple injections with post injections
• • 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
• • 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
  • F02D41/021—Introducing corrections for particular conditions exterior to the engine
  • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
  • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
  • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
• • 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
  • F02D41/30—Controlling fuel injection
  • F02D41/38—Controlling fuel injection of the high pressure type
  • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
  • F01M1/00—Pressure lubrication
  • F01M1/16—Controlling lubricant pressure or quantity
  • F01M2001/165—Controlling lubricant pressure or quantity according to fuel dilution in oil
• • 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
  • F02D2200/08—Exhaust gas treatment apparatus parameters
  • F02D2200/0812—Particle filter loading
• • 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
  • F02D2250/11—Oil dilution, i.e. prevention thereof or special controls according thereto
• • 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
  • Y02T10/40—Engine management systems

Definitions

• the invention relates to diesel engines equipped with a particulate filter, and more specifically to controlling the stopping of a regeneration procedure applied to such a particulate filter.
• Diesel engines by their specific operation, emit (among others) in their exhaust gases soot pollutants that are also called particles
• a particulate filter is placed in the exhaust line, downstream of the combustion chambers of the engine. This filter retains the particles that accumulate within it as as the engine is used. This accumulation of particles eventually clogs the filter, creating a strong back pressure to the exhaust of the engine, that is to say, an obstacle to the path of the gases in the exhaust line The diesel engine then sees its performance markedly diminished. In order to recover the engine performance, the particles contained in the particulate filter are burned. This procedure is called the regeneration of the particle filter
• the initialization and maintenance of the combustion of particles in the filter is obtained by raising the internal temperature of the particulate filter.
• a delayed injection is introduced into the combustion chambers of the engine, that is to say that fuel is injected after the top dead center (TDC) of the engine cycle, during the expansion phase.
• TDC top dead center
• the principle of late injections is also known. It is then a question of injecting gas oil longer after the top dead center so that the gas oil does not burn in the combustion chamber, but in a part of the fuel line.
• this catalytic portion is constituted by, for example, an oxidation catalyst placed upstream of the particulate filter, or by a simple catalytic material (such as platinum) within the particulate filter It is on these catalytic sites that the compounds HC and CO of the late injecti ons oxidize, increasing the temperature of the gases.
• This filtering operation is carried out periodically, as soon as the quantity of particles in the filter becomes too great. This regeneration takes place when the motor is running, and this without the user noticing it. In a regeneration procedure, the dilution of the gas oil in the engine lubricating oil is considerably increased.
• the regeneration procedure should be as short as possible, in order to keep the oil to a minimum, while at the same time regenerating the filter as much as possible.
• the processes used implement so - called complete regenerations.
• the regeneration procedure is, in other words, stopped when the particulate filter no longer contains combustible particles.
• An object of the present invention is to propose a method and a device for regeneration of a particle filter which implement controlled partial regenerations. in order to limit the consumption of gas oil injected into the chambers for regeneration Thus, an associated goal is to control the dilution occasi oned by the regeneration
• a more general object of the invention is to provide a method and regeneration means which keep the engine under healthy operating conditions.
• This object is achieved according to the invention by means of a stop phase of a regeneration phase of a diesel engine particulate filter of a motor vehicle, comprising means for evaluating a quantity of soot removed since the beginning of the current regeneration phase
• the device comprises means for evaluating a value indicating the dilution of the oil in the oil during the current regeneration phase, as well as means for monitoring the value. a ratio between the diluti on indicator value and the amount of soot removed, said tracking means being able to identify the achievement of a predefined criterion relating to the evolution of this ratio and to initiate the stopping of the regeneration phase at the achievement of this predefined criterion
• the dilution value that appears during the current regeneration phase is preferably a cumulative value in the time of each successive value of the dilution that has appeared since the beginning of the regeneration phase until the moment considered.
• the means for monitoring the value of the ratio between the dilution and the quantity of soot eliminated are preferably means capable of identifying the achievement of a minimum of the evolution of the value of said ratio over time and able to initiate a stopping the regeneration phase when this minimum is reached
• the means for monitoring the value of the ratio between the dilution and the amount of soot removed are means capable of initiating a stop of the regeneration phase at a point of inflection of an evolution of said dilution ratio. mass over time
• the means for monitoring the value of the ratio between the dilution and the quantity of soot eliminated advantageously comprise a series of sensors of physical parameters as well as a calculator implementing a mathematical model, which mathematical model gives an evaluation of said ratio by function of parameters acquired in real time by the sensors.
• the means for monitoring the value of the ratio between the dilution and the amount of soot removed include, for example, a series of physical parameter sensors arranged near the particle filter and the cylinder.
• the mathematical model used typically delivers, in turn, a result in the form of a probability associated with at least one value of said ratio between the dilution and the amount of soot removed.
• the invention also proposes a method for stopping a regeneration phase of a diesel engine particulate filter, said method comprising the step of evaluating a quantity of soot eliminated since the beginning of the regeneration phase.
• in progress method preferably comprises a step of evaluating a value indicative of a dilution of the oil in the oil appeared during the regeneration phase, a step of establishing a ratio between the dilution indicator value appeared and the quantity value it has been eliminated, as well as a step consi stant to identify the achievement of a criterion predefined by this report during its evolution.
• FIG. 1 is a functional view of an engine block equipped with a particle filter and a device according to the invention
• FIG. 2 is a plot showing the evolution of a report used by the device according to the invention. All the members illustrated in Figure 1 is distributed around a cylinder 10 of diesel engine of a motor vehicle. It distinguishes an air intake pipe 1 1 and an exhaust pipe 12 as well as an injection device 13.
• the exhaust pipe 12 is equipped with a turbo-compressor 20.
• the driving of exhaust 12 comprises, downstream of the turbine
• Recycle gas is referenced 40 in FIG.
• a calculator 55 acting as hostage host of the regeneration phases, and especially stopping thereof.
• the computation unit 55 controls an injection valve 14 at the cylinder 10 by which it physically controls the injection or not for the heating of the particulate filter 30.
• a decision - making method for stopping the regeneration phase by the computer 55 is proposed.
• the computer 55 takes a series of physical data at the level of the particle filter 30. Thus, it receives the signals provided by a series of sensors referenced 31, 32, 33, 34 in FIG.
• a temperature sensor 31 takes the temperature upstream of the filter 30, a sensor 32 takes the temperature downstream of the filter 30
• Pressure sensors 33 and 34 respectively take the upstream and downstream pressures to the filter 30.
• a flowmeter 35 is also located near the particulate filter.
• the computer 55 also receives the value of the fuel flow during injection in real time. It also has, by integrating the flow rate values, the global volume of gas oil injected since the beginning of the current regeneration phase.
• the calculator 55 further comprises two additional inputs 56 and 57 receiving the signals of two corresponding sensors and not shown in FIG. 1.
• the sensor associated with the input 56 delivers a value of engine speed in real time
• the sensor associated with the input 57 delivers for example a temperature value at the cylinder 10.
• the calculator From the parameters taken and transmitted to the cal culator, the calculator performs a double evaluation. On the one hand, it assesses the dilution of gas oil in the oil as it has appeared until now during the regeneration phase. On the other hand, it assesses the mass of soot burned up to now in the regeneration phase.
• the dilution indicator value is obtained here using a pre - recorded model establishing, as a function of temperatures and pressures, the typical evolution of the dilution of gas oil in oil over time. It is based on the use of pre - recorded data matching the different values of the parameters mentioned above with the dilution of the gasol in the oil to be expected. This dilution of the gas oil in the oil could be observed during laboratory tests, by physical sampling of the oil diluted in the oil at the inlet of the exhaust, or as a result of a calculation on a physical model. previously done.
• the dilutive indicator value therefore corresponds to the dilution present at the moment considered, as evaluated by taking into account the evolution of the conditions of solicitation of the multiple injection actually implemented at the moment considered and the previous instants of the regeneration phase in progress.
• the computation here evaluates the dilution in the form of a cumulative sum of the different dilution values that have appeared over time for the duration already elapsed since the beginning of the regeneration phase.
• This cumulative sum is established by the computer, for example in the form of an integral over time of each successive dilution value.
• This indicator value will be called the "cumulative diluti on since the beginning of the regeneration".
• a statistical model is adopted in a variety of ways.
• the calculator performs a second evaluation, always in real time. It is the evaluation of the quantity of soot burned since the beginning of the regeneration Again, this quantity of soot is determined by a physical or statistical model, from the pressure and temperature data taken by the calculator. 55 Thanks to the double evaluation of the cumulative dilution and the mass of soot burned, the calculation 55 determines at any time the ratio
• the computer 55 carries out a real-time monitoring of the value of the ratio diluti on / mass of burnt soot.
• the typical evolution of this ratio over the course of time. will show the shape of the plot in Figure 2 The value of this report is noted there r
• this line In addition to an initial burst of the burned mass dilution ratio, this line describes a horizontal plateau 65 followed by a rising phase 70, the slope of which is itself increasing over time, to stabilize in a zone of increase.
• linear 80
• the calculator determines for this purpose the slope of the evolution of the report, and this in real time When the slope is canceled, the calculator deduces that the minimum is reached According to a vari ante, the calculator identifies the appearance of a point of inflection which he interprets as revealing the appearance of the minimum expected
• the calculator establishes a mass-to-dilution ratio, and implements a decision as to the cessation of the regeneration from the crossing of the a predefined threshold. For example, the calculator monitors the downward crossing of a minimum threshold of the ratio.
• the calculator can also determine a minimum ratio 66 of the change in the ratio of dilution to mass, as illustrated in the plot of FIG.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Processes For Solid Components From Exhaust (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)

Applications Claiming Priority (2)

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• 2004
  • 2004-11-29 FR FR0412633A patent/FR2878566B1/fr not_active Expired - Fee Related
• 2005
  • 2005-11-23 JP JP2007542069A patent/JP4734340B2/ja not_active Expired - Fee Related
  • 2005-11-23 KR KR1020077014557A patent/KR20070090216A/ko not_active Application Discontinuation
  • 2005-11-23 EP EP05819422A patent/EP1819915A1/fr not_active Withdrawn
  • 2005-11-23 WO PCT/FR2005/050980 patent/WO2006056718A1/fr active Application Filing

Non-Patent Citations (1)

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