Classifications

• • 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
  • F02P9/00—Electric spark ignition control, not otherwise provided for
  • F02P9/002—Control of spark intensity, intensifying, lengthening, suppression
  • F02P9/007—Control of spark intensity, intensifying, lengthening, suppression by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition
• • 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
  • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
  • F02P17/12—Testing characteristics of the spark, ignition voltage or current
• • 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
  • F02P23/00—Other ignition
  • F02P23/04—Other physical ignition means, e.g. using laser rays
• • 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
  • F02D2250/14—Timing of measurement, e.g. synchronisation of measurements to the engine cycle
• • 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
  • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
  • F02P17/12—Testing characteristics of the spark, ignition voltage or current
  • F02P2017/125—Measuring ionisation of combustion gas, e.g. by using ignition circuits

Definitions

• the present invention relates to the control of the operation of an internal combustion engine of a motor vehicle equipped with an engine control computer, radiofrequency candles, and an associated ignition computer.
• the use of radiofrequency candles requires the implementation of a dedicated ignition computer, communicating with the engine control computer.
• the engine control computer is integrated in a housing and emits power signals (power signals) to the RF candles via power interfaces through the ignition computer, itself integrated into another housing also equipped with power interfaces.
• the ignition signals - or ignition command - are sent on a dedicated link, exclusive, typically a wired link connecting the engine control computer and the ignition computer.
• the engine control computer and the ignition computer communicate with each other on another link, typically a high-speed communication bus, by a communication interface such as a CAN interface for "Controlled Area Network".
• the data exchanged for example at 500 kbit / s or IMbit / s typically concern parameterization or diagnostic information.
• the modification of the power or communication interfaces, or the modification of the computer housings are very expensive solutions which thus limit developments in the field.
• the invention aims to cleverly circumvent this cost problem by developing new features on a conventional architecture. More specifically, according to a first of its objects, the invention relates to a method for controlling the operation of an internal combustion engine of a motor vehicle equipped with an engine control computer, radiofrequency candles and a control computer. associated ignition, the method comprising the steps of:
• the method is essentially characterized in that it further comprises a step of measuring, by the ignition computer, the value of an ionisation signal per cylinder of the engine.
• the method further comprises a step of synchronizing the ionization signal and the ignition signal.
• the method further comprises a step of analyzing the ionization signal.
• the method further comprises a step of transmitting the analysis result of the ionization signal from the ignition computer to the engine control computer.
• the method further comprises the steps of:
• the invention relates to a system for controlling the operation of an internal combustion engine of a motor vehicle equipped with radiofrequency candles, the system comprising:
• the system is essentially characterized in that the ignition computer is configured to measure the value of an ionisation signal per cylinder of the engine.
• this ignition computer comprises a circuit for measuring the value of said ionization signal.
• one of the ignition computers or engine control computer is configured to synchronize the ionization signal and the ignition signal.
• the ignition computer is configured to analyze the ionization signal and transmit the result of analysis to the engine control computer.
• the engine control computer is configured to:
• the invention finally relates to a computer program, comprising program code instructions for executing the steps of the method according to the invention, when said program is executed on a computer.
• FIG. 1 illustrates an embodiment of the system according to the invention
• FIG. 2 illustrates ionization signals on an internal combustion engine equipped with 4 cylinders
• FIG. 3 illustrates an embodiment of the method according to the invention.
• the ionization signal is an electrical image of the real-time development of combustion.
• the measurement and analysis of this information on each cylinder provides a particularly useful diagnostic set to ensure optimum control of an internal combustion engine, whether for misfire detection, knock detection or the like.
• the measurement of the ionization signal consists of applying a DC voltage between the tip of the radiofrequency plug (or the glow plug) of a given cylinder and the driving mass, and measuring the value of the current induced by the combustion.
• the evolution of the current that is to say of the corresponding signal, makes it possible to diagnose combustion.
• the measurement of the ionization signal consists of converting the combustion current into a voltage by taking a measurement at the output of the power stage of a radiofrequency ignition system.
• the ignition computer 5 powered by the onboard network 9 of the motor vehicle, is configured to measure the value of an ionization signal per cylinder of the engine.
• the shape of such an ionization signal is illustrated in FIG. 2.
• Each signal A, B, C, and D corresponds to the ionisation signal on a respective cylinder, for a four-cylinder engine.
• Signal E is the (optional) multiplexing of the 4 ionization signals.
• each ionization signal comprises a first square signal SAT, corresponding in fact to a saturation due to ignition (spark) during which no measurement is possible; a first peak PI corresponding to the creation of chemical species and a second peak P2 corresponding to the temperature increase in the combustion chamber.
• the ionization signal must be accurately synchronized with respect to the combustion cycles and the rotation of the engine. Or the ignition signal or ignition command, issued
• wire links 7 for the transmission of the ignition signal illustrated by simple arrows in FIG. 1 illustrate in this case a wire connection per cylinder, either a signal per cylinder, or 4 in this case. It is however possible to multiplex / demultiplex the ignition signals between the engine control computer 4 and the ignition computer 5.
• synchronization 30 is implemented by software modification of the ignition computer
• the raw data of the ionization signals do not need to be transmitted on a high-speed link from the ignition computer 5 to the engine control computer 4, only the results of the calculations, that is, the analysis, can be communicated on the CAN bus 6, the bus 6 also making it possible to communicate from the engine control computer 4 to the ignition computer 5 information about the spark to be produced (quantity / quality of the energy to be supplied), as well as for example the operating point (speed / load) of the engine.
• the ignition computer 5 is configured to analyze the ionization signal and transmit the analysis result to the engine control computer 4, in this case by the bus 6.
• the analysis 40 of the The ionization signal comprises, for example, the calculation of the area of the signal comprising the peaks P1 and P2, and / or the determination of the instants of the peaks P1 and P2, and / or their respective amplitude, etc. which makes it possible to diagnose the combustion of each cylinder as such, and with respect to ignition.
• the result of analysis of the ionization signal is then transmitted 40 from the ignition computer 5 to the engine control computer 4.
• the engine control computer 5 can then compare the analysis result of the ionization signal with a reference model, and modify or not 70 one of the parameters of the operation of the engine. engine according to the result of the comparison; for example by acting on the ignition and / or on an actuator (injection or other) if necessary.
• the measurement of the ionization signal is made at a fixed frequency, and therefore at a constant time difference. However, the speed of rotation of the motor is variable in time and fluctuates even during a rotation.
• the engine control computer 4 receives information from at least the flywheel sensor 1 (or PMH sensor which indicates the angular position of a cylinder) or the camshaft sensor 2 (which provides the angular position of the camshaft), or even other sensors 3.
• the acquisition (measurement) of the ionization signal is carried out successively on each cylinder; the switching from one cylinder to the other being carried out either at the beginning of the generation of a new ignition command, or after a predefined period, in this case 720 ° vi crankshaft / Nc with Ne the number of cylinders, for example in the case of absence of ignition control (static-static ignitions, voluntary cutting or no ignition ).
• This solution makes the proper sequencing of the acquisition of the ionization signal reliable at all times and makes it possible to detect auto-inflammations in the absence of a spark.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Plasma & Fusion (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)

Applications Claiming Priority (2)

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Family Cites Families (6)

• 2010
  • 2010-12-23 FR FR1061221A patent/FR2969717A1/fr not_active Withdrawn
• 2011
  • 2011-12-21 WO PCT/EP2011/073603 patent/WO2012085094A1/fr not_active Ceased
  • 2011-12-21 EP EP11802094.0A patent/EP2655865A1/de not_active Withdrawn

Non-Patent Citations (1)

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