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
  • F02D41/401—Controlling injection timing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
  • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
  • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
• • 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
  • F02D41/14—Introducing closed-loop corrections
  • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
• • 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
  • F02D41/14—Introducing closed-loop corrections
  • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
  • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
  • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
• • 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
  • F02D41/14—Introducing closed-loop corrections
  • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
  • F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
• • 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
  • F02D41/14—Introducing closed-loop corrections
  • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
  • F02D2041/1413—Controller structures or design
  • F02D2041/1432—Controller structures or design the system including a filter, e.g. a low pass or high pass filter
• • 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
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/008—Controlling each cylinder individually
• • 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
  • F02D41/14—Introducing closed-loop corrections
  • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
  • F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
  • F02D41/1488—Inhibiting the regulation
• • 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
• • 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 a method for maximizing the pressure in the cylinders of an internal combustion engine and an associated regulating device. It finds an advantageous application in a motor vehicle equipped with an internal combustion engine, including a diesel engine.
• the invention more specifically refers to a method which makes it possible to decline a signal representative of the measurements and a setpoint of a parameter of the motor into a signal representative of an advance correction at the injection.
• the development of the motors involves taking into account manufacturing dispersions and making injection instructions in order to meet the reliability constraints.
• the invention furthermore comprises the use, optionally, of a single pressure sensor in the cylinders by motor, or a sensor of pressure for each cylinder of the engine to thus advantageously reduce the margins taken from the theoretical limits.
• EP 0145480 discloses the use of a measurement of the variation of the pressure in the cylinders by means of piezoelectric devices, but it does not disclose which parameter is regulated to maximize the pressure in the cylinders.
• the document WO 9015244 provides for regulating a value representative of the ignition advance by means of piston stroke length sensors, or of the piston angle observable with respect to an original position. But this document does not provide for maximizing the maximum pressure in the cylinders, nor for adjusting the pressure in the cylinders around a target value.
• DE 2952073 proposes a process which automatically compensates for series production dispersions of the engines. This document implements a method that calculates cycle by cycle a maximum pressure value by means of a pressure sensor in the cylinders.
• the value representative of the maximum of the pressure in the cylinders given by the sensor is sent to a regulator, but it does not have the function of regulating the pressure in the cylinders around a setpoint value.
• the regulator serves to maximize the engine performance by increasing the work of the air-fuel mixture in the engine cylinders.
• the invention thus relates to a method of maximizing a torque provided by a motor subject to reliability constraints and cyclic dispersions comprising a regulator adapted to generate a signal representative of a correction of advance to injection at go a signal representative of the measurements of a motor parameter and of a signal representative of a setpoint of the motor parameter. It includes the steps of:
• the step of defining an instruction of the maximum of the pressure in the cylinders comprises the generation of a signal representative of an instruction of the maximum of the pressure in the cylinders.
• the step of defining an operating range of the regulator comprises a comparison of the representative values of the engine speed and the engine torque demand with a motor torque threshold adapted to the operation of the engine. regulator.
• the step of defining an operating range of the regulator comprises a condition for stabilizing a value representative of the maximum of the pressure in the cylinders.
• the regulation step can be implemented by means of a proportional integral type regulator, said regulator being calibrated so that the signal generated representative of an injection advance correction does not exceed a setpoint value. of the motor parameter.
• the engine parameter can be the maximum of the pressure in the cylinders.
• the correction step is implemented by said regulator.
• the step of correcting the injection advance feeds a control unit. with a signal representative of a bounded correction of the advance to injection.
• the method may comprise a fuel flow correction step injected in the cylinders of the engine.
• the injected rate correction step generates a signal representative of a flow rate correction injected to generate additional engine torque.
• the injected flow rate correction step is performed so as to maintain a constant, or substantially constant, exhaust temperature.
• the invention also relates to a device for implementing a method of maximizing a torque provided by an engine subject to reliability constraints and cyclic dispersions, comprising a regulator adapted to generate a signal representative of a correction in advance of the inj ection from a signal representative of the measurements of a motor parameter and of a signal representative of a setpoint of the motor parameter.
• the device comprises a control unit configured to control the inj ection in the cylinders of the motor as a function of a signal representative of a bounded correction of the injection advance and / or a signal representative of a fuel flow correction injected in the cylinders.
• the torque minimizing device is intended to minimize the pressure in the cylinders of a motor vehicle internal combustion engine subjected to reliability constraints and cyclic dispersions.
• This device comprises a comparator 1, a regulator 2 receiving an error signal error _P cy imax representative of maximum pressure error in the cylinders. It comprises a pressure sensor 7 adapted to measure the pressure in the engine cylinders, as well as a control unit 6 which controls the injection of an air / fuel mixture into the engine cylinders from a signal Injection timing correction from regulator 2.
• the method comprises a first step A of defining an operating range of the regulator 2, and a step B of defining a stability criterion of a measurement of a maximum of the pressure in the cylinders.
• the regulator 2 is capable of implementing a control of the advance to injection.
• the method comprises a step C of the alignment of the injection advance correction, a step D of calculating the injected fuel flow correction, a step E of calculating a maximum pressure gradient in the ports. cylinders and a filtering step F.
• the comparator 1 which can be integrated in the regulator 2, compares two inputs adapted to receive a reference setpoint signal _P cy imax representative of a setpoint of a maximum pressure in the cylinders in the vicinity of the neutral position high (TDC) of the piston P and a cy signal representative imax_filtree filtered measures a maximum pressure in the cylinders.
• the comparator 1 generates from these two inputs an error signal err _P cy imax representative of an error of a maximum pressure in the cylinders.
• the comparator 1 can calculate this value by means of the following formula:
• the error signal err_P cy imax representative of the error of the maximum pressure in the cylinders is sent to the regulator 2.
• the latter is intended to receive a second stability signal stab_P C yimax representative of a state of stability of the measurements of a maximum pressure in the cylinders.
• This signal must have passed a stability criterion.
• the method thus implements a step B during which a stability criterion to be satisfied is defined so that the error signal can reach the regulator.
• the stability criterion is verified by the regulator 2 and is an additional condition to the activation of the latter.
• the regulator 2 comprises a specific operating range setting a TQI value representative of the engine torque demand and an N value representative of the engine speed. This operating range is defined in step A.
• an activation condition requires, for example, that the TQI value representative of the engine torque demand is substantially close to a threshold Cmax representative of a motor torque adapted to the operation of the regulator.
• the regulator 2 is, for example, an integral proportional type regulator, in particular with a low proportional term, which makes it possible to carry out a closed-loop servocontrol of the setpoint of a maximum pressure in the cylinders. It is calibrated so as not to exceed the setpoint.
• the regulator 2 outputs a correction signal corr_assemble representative of a correction advance injection.
• the injection timing correction is bounded during step C of the timing of the injection timing correction to ensure a sufficiently slow dynamic of the injection timing correction.
• the modification of the injection advance has an effect on the exhaust temperature T av t.
• the higher the injection advance the lower the exhaust temperature.
• the invention provides advantageously, in a step D, to calculate for each variation of the advance to the inj ection fuel flow patch inj ected maintaining exhaust temperature T av t substantially constant during the cycles in the goal of gaining extra engine torque.
• This calculation can be performed by a calculation unit not shown in the appended figure, which can be integrated in the control unit 6, and which generates a correction signal corr_debit representative of the injected flow correction.
• the cylindrical pressure sensor 7 measures the pressure in the cylinders at each cycle.
• the operating range of the regulator advantageously makes it possible to overcome the disadvantage of the filtering delay.
• the grad_P cy imax gradient of the maximum pressure value Pcyimax during step E is calculated to define a criterion of stability of the measurements, and thus advantageously to guarantee the low dynamics of the system.
• a stability signal stab_P cy imax is generated and is transmitted to the regulator 2 so as to carry out a cycle which repeats iteratively as long as the engine is running.
• the regulator is a conventional regulator PID (proportional integral derivator), but then has the disadvantage of generating setpoint overruns.
• the criterion of operation of the regulator comprises a condition on a gradient of engine torque and engine speed.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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Citations (4)

Family Cites Families (18)

• 2016
  • 2016-10-07 FR FR1659699A patent/FR3057303B1/fr active Active
• 2017
  • 2017-09-28 WO PCT/FR2017/052647 patent/WO2018065700A2/fr unknown
  • 2017-09-28 JP JP2019518477A patent/JP2019530825A/ja active Pending
  • 2017-09-28 CN CN201780068787.7A patent/CN110100085B/zh active Active
  • 2017-09-28 EP EP17786964.1A patent/EP3523531A2/fr active Pending
  • 2017-09-28 KR KR1020197013156A patent/KR102211809B1/ko active IP Right Grant

Patent Citations (4)

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