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
  • F02D41/20—Output circuits, e.g. for controlling currents in command coils
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
  • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L2201/00—Electronic control systems; Apparatus or methods therefor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L2800/00—Methods of operation using a variable valve timing mechanism
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
  • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
  • H01H47/32—Energising current supplied by semiconductor device
  • H01H47/325—Energising current supplied by semiconductor device by switching regulator

Definitions

• a method of feeding of U Productio electrical t The present invention relates to a method for supplying electrical equipment such as an electromagnetic actuator which can be used in particular for actuating the valves of heat engines of motor vehicles.
• Such an electromagnetic actuator is incorporated in a supply network in which it is connected via a capacitive element to a voltage converter which is itself connected to an accumulator and to an alternator and which is regulated in voltage and limited in current.
• the operation of the electromagnetic actuator generates current draws on the network at the output of the voltage converter which are passed on at the input of the voltage converter. This results in current peaks whose characteristics are incompatible with the response time of the alternator so that, the alternator being unable to supply the necessary current, this is taken from the accumulator. However, these high amplitude current peaks cause the accumulator to heat up, which makes standard accumulators unsuitable for such use.
• An object of the invention is to provide an economical and efficient means for optimally supplying such electrical equipment. To this end, provision is made, according to the invention, for a method for supplying electrical equipment which operates according to intensity peaks and which is connected via at least one capacitive element to a voltage converter connected to an accumulator, the voltage converter being regulated by running from an intensity setpoint corresponding to an average intensity between two peaks.
• the current regulation of the voltage converter which is thus controlled as a current generator allows the current supplied by the accumulator at the input of the voltage converter to be kept at a substantially constant value. This allows to have a minimum volume of one capacitive element.
• the average intensity is evaluated in a predictive manner on the basis of actuator control data.
• the intensity setpoint is thus obtained in advance.
• This calculation method makes it possible to obtain the intensity setpoint in a simple manner and to avoid using as a setpoint a periodically measured intensity which requires rapid regulation and a high capacity as energy reserve in the event of abrupt current variation.
• the intensity setpoint is equal to the evaluated average intensity increased by a correction factor for an output voltage of the converter which is rising and lower than an upper voltage limit, and the intensity setpoint is equal to the average current evaluated minus the correction factor for a converter output voltage which is falling and greater than a lower voltage limit.
• the correction factor is determined in such a way that the input current of the converter is maintained within a determined range compatible with the characteristics of the accumulator and that the voltage at the output of the converter is maintained within a determined range compatible with the characteristics of the equipment. This makes it possible to limit the frequency of calculation of the setpoint.
• the correction factor corresponds to an imprecision in the evaluation of the average intensity and is preferably equal to approximately 10% of the average intensity evaluated.
• the correction factor makes it possible to compensate for any differences between the average intensity evaluated and the average intensity actually consumed.
• the correction factor thus makes it possible to determine a range of average intensities to which the average intensity actually consumed is highly likely to belong.
• the method according to the invention is here intended for the supply of an electromagnetic actuator usable for actuating valves of a heat engine of a motor vehicle.
• an actuator comprises electromagnetic coils which, when energized, attract a pallet of which at least one valve is integral to bring and maintain the valve in the open position and in the closed position.
• the current necessary for the excitation of the coils must be supplied to them in the form of peaks of high amplitude and of short duration according to an excitation frequency determined by a calculator of the vehicle which controls the actuator in current in function of control data such as depressing the accelerator pedal, engine speed, vehicle speed and more generally engine load parameters.
• the electromagnetic actuator 1 is connected to a supply circuit 2 which comprises an accumulator 3 connected to a voltage converter 4.
• the accumulator 3 delivers a voltage of the order of 12 volts and is connected to an alternator not shown to be recharged.
• the voltage converter 4 is arranged to convert the input voltage of 12 volts into an output voltage of the order of 42 volts.
• the voltage converter 4 is connected to the electromagnetic actuator 1 by a capacitive element 5 arranged to allow the storage of the energy supplied by the voltage converter 4.
• the method according to the invention consists in regulating the voltage converter 4 into current from an intensity setpoint corresponding to an average intensity between two peaks.
• the average intensity is evaluated predictively from the voltage in the accumulator 3 and the peak power which will be consumed over a predetermined cycle time. This power depends on the engine speed which can be deduced from the actuator control data used by the vehicle computer.
• the voltage converter thus controlled forms a current generator which is controlled by the average power which will be consumed during the next thermal cycle.
• the regulation is carried out in a conventional manner by modulating the voltage at the input of the converter as a function of the current measured at the output of the converter. A measurement of the voltage is also carried out. at the output of the converter, which is supplied to the computer and is used to apply, when determining the intensity setpoint, a correction factor to the evaluated average intensity.
• the intensity setpoint is thus equal to the evaluated average intensity increased by the correction factor for an output voltage of the converter which is rising and which is less than an upper voltage limit, and the intensity setpoint is equal to 1 the evaluated average intensity minus the correction factor for a converter output voltage which is falling and which is greater than a lower voltage limit.
• This correction factor corresponds to an uncertainty about the time of appearance of the next intensity peak, that is to say a possible difference between the average intensity evaluated and the average intensity actually consumed.
• the correction factor is approximately 10% of the average intensity evaluated. Due to the control of the voltage converter as a current generator, the voltage at the output of the converter varies. It will be noted that the actuator being controlled in current, variations in the voltage are not a problem. These variations are however kept within the range delimited by the lower and upper voltage limits. These limits are determined so that the corresponding voltage range is compatible with the characteristics of the actuator. By way of example, if the characteristics of the actuator allow operation in a voltage range between 30 volts and 50 volts, a lower limit equal to approximately 34 volts and an upper limit equal to approximately 44 volts is chosen.
• the setpoint can be calculated from an intensity measured periodically.
• the correction factor is equal to
• the lower and upper voltage limits can also be modified, in particular being closer or more distant from each other according to the characteristics of the equipment to be supplied.
• the invention is not limited to the supply of an electromagnetic actuator but can be used to supply any electrical equipment operating in a pulsed mode.
• the invention can be applied to a system for flashing the headlights of the vehicle.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Control Of Eletrric Generators (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
• Control Of Electrical Variables (AREA)
• Generation Of Surge Voltage And Current (AREA)
• Dc-Dc Converters (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 2001
  • 2001-06-15 FR FR0107855A patent/FR2826200B1/fr not_active Expired - Lifetime
• 2002
  • 2002-06-13 WO PCT/FR2002/002027 patent/WO2002103729A2/fr not_active Ceased
  • 2002-06-13 US US10/480,579 patent/US7188591B2/en not_active Expired - Lifetime
  • 2002-06-13 AU AU2002317248A patent/AU2002317248A1/en not_active Abandoned
  • 2002-06-13 EP EP02745523.7A patent/EP1396002B1/de not_active Expired - Lifetime
  • 2002-06-13 JP JP2003505955A patent/JP4098714B2/ja not_active Expired - Fee Related

Non-Patent Citations (1)

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