Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N11/00—Starting of engines by means of electric motors
  • F02N11/08—Circuits specially adapted for starting of engines
  • F02N11/087—Details of the switching means in starting circuits, e.g. relays or electronic switches
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N11/00—Starting of engines by means of electric motors
  • F02N11/08—Circuits specially adapted for starting of engines
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/24—Magnetic cores
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/2847—Sheets; Strips
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F37/00—Fixed inductances not covered by group H01F17/00
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
  • H02P1/02—Details of starting control
  • H02P1/04—Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
  • H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
  • H02P1/18—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual DC motor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N11/00—Starting of engines by means of electric motors
  • F02N11/08—Circuits specially adapted for starting of engines
  • F02N2011/0881—Components of the circuit not provided for by previous groups
  • F02N2011/0892—Two coils being used in the starting circuit, e.g. in two windings in the starting relay or two field windings in the starter
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N2250/00—Problems related to engine starting or engine's starting apparatus
  • F02N2250/02—Battery voltage drop at start, e.g. drops causing ECU reset

Definitions

• the invention relates to the field of starters for a heat engine in motor vehicles. This domain also includes starters providing an alternator function, called “alternator-starters”. More particularly, the invention relates to a device for raising the voltage across the battery of the vehicle when powering the starter.
• a major disadvantage of these converters lies in the substantial costs they introduce.
• Another known solution proposes to control the starter by means of two relays, a delay and a current limiting resistor.
• a delay whose duration is determined by the time delay
• an additional resistor is inserted in series in the starting circuit and limits the peak of initial current.
• the additional resistance is output from the starting circuit in order to allow the passage of a sufficient current in the armature of the starter and allow a rise in speed thereof.
• the inventive entity has already proposed improvements to existing starters of the prior art, in particular for applications in motor vehicles of the shutdown and automatic restart function of the engine. .
• Such a filtering device described in particular in document PCT / FR201 1/052638 comprises a primary winding circuit intended to be inserted in series into said power circuit, and preferably a secondary winding circuit in short circuit.
• the primary winding circuit W1 arranged around the core C of the LPF filtering device is formed by a conductor 3 in the form of a flat part wound on the flat part, that is to say with the smaller I side of the flat along the radius and the longer side L of the flat according to the height, which poses congestion problems.
• a configuration imposes a large clearance along the height in the axial direction between the coil and the cylinder head taking into account the large helical pitch between the turns clearly visible in Figure 2.
• the invention aims to improve the compactness of such a device while retaining at least the same performance by providing a starter battery voltage enhancement device for preventing a fall in the battery voltage produced by a peak current intervening in a power circuit of said starter at power up thereof, comprising a carcass of magnetic material, a primary winding circuit for serially inserting into said power circuit, and a secondary winding circuit in short circuit, wherein said primary winding circuit and / or said secondary winding circuit comprises a winding formed from at least one field-wound flat conductor.
• winding on field winding with the largest side of the flat oriented along the radius.
• the invention thus makes it possible to obtain a significant reduction in the length, mass, and volume of the device, as well as the resistance of the winding W2 while respecting the same resistance constraints.
• the invention also makes it possible to reduce the clearance along the height between the winding and the yoke, taking into account the reduced helix pitch compared with the flat winding.
• the winding of said primary winding circuit and / or of said secondary winding circuit comprises a single row of conductors in a radial direction.
• Such a very compact configuration will have the same performance as the flat wound configuration of FIG. 2 with two radial rows of conductors.
• said primary winding circuit and / or said secondary winding circuit has a direct return so that an input and a current output of said primary winding circuit and / or said secondary winding circuit are positioned on the same side. It should be noted in this respect that such a direct return after the production of a single layer of primary turns would not have been possible with a conductor wound on a flat because of the impossibility of folding.
• a notch is provided in an inner face of a yoke of the carcass for receiving the return of said primary winding circuit and / or said secondary winding circuit.
• said secondary winding circuit is juxtaposed axially with said primary winding circuit.
• said secondary winding circuit is arranged around said primary winding circuit.
• said secondary winding circuit is formed by at least one tube-shaped conductor.
• a bias winding circuit is intended to be installed in a control circuit of the starter.
• said bias winding circuit is wound in the opposite direction of said primary winding circuit.
• said bias winding circuit is wound around said secondary winding circuit.
• said bias winding circuit is arranged at one end of the primary and secondary winding circuits.
• the invention also relates to a combination of a starter, comprising a DC electric motor and an electromagnetic contactor, and a starter voltage enhancement device according to the invention.
• the voltage enhancement device is connected in series with said electric motor in the power circuit.
• the voltage enhancement device is inserted into the power circuit between a power contact of the contactor and the electric motor.
• FIG. 1 is a diagrammatic view in axial section of a primary circuit winding arranged around the core of a filtering device according to the state of the art;
• Figure 2 already described, shows a perspective view of the primary circuit winding of Figure 1;
• Figure 3 is a perspective view showing a combination of a starter and an inductive type filtering device according to the invention.
• Fig. 4 is a block diagram of a starter electrical circuit including the combination of Fig. 3;
• FIG. 5 is an axial sectional view of the filter device according to the invention in a first embodiment
• FIG. 6 represents a perspective view of the primary winding circuit of the filtering device of FIGS. 5, 8a and 8b;
• Figure 7 shows a cross-sectional view of the yoke of the filter device according to the invention.
• Figures 8a and 8b show respectively a perspective view and an axial sectional view of the filter device according to the invention in a second embodiment
• FIG. 9 represents the block diagram of the starter electrical circuit integrating the filtering device of FIGS. 8a and 8b.
• FIG. 3 shows a combination 1 of a starter, comprising a DCM DC electric motor and an electromagnetic contactor EC, and a voltage enhancement device consisting of an inductive type LPF filtering device.
• the LPF filtering device is mechanically fixed to an outer casing of the starter, close to the contactor EC.
• the electrical connections between the LPF filtering device, the EC contactor and the DCM electric motor are shown in FIG. 4.
• the LPF filtering device is electrically connected in series between the power contact CP of the contactor EC and the DCM motor.
• the LPF filtering device is not integrated in the EC starter, DCM, but is inserted in the power circuit between the positive terminal B + of the battery and the power contact CP .
• the EC contactor is here a conventional starter contactor, single power contact CP, and comprises a solenoid formed of a call coil and a holding coil. Closing a start contact CS of the vehicle controls the excitation of the call and hold coils, and the activation of the starter according to a sequencing well known to those skilled in the art and which will not be detailed here.
• the strong initial current peak mentioned above occurs when the power contact CP is closed when the DCM motor is powered at full power. Closing the power contact CP also causes the LPF filtering device to flow a power supply to the DCM motor.
• the LPF filtering device is in this case an inductive type device which is designed as a battlelike type transformer having magnetically coupled windings.
• a simple inductor could have been used to form the low-pass filtering device on which the optimization work was carried out.
• the embodiment with a transformer makes it possible to have more parameters to adjust the frequency response of the LPF device according to the application.
• it is possible to optimize this response by adjusting the inductances of the primary and secondary circuits W1, W2 and the inductance introduced by the coupling between these circuits.
• the primary winding circuit W1 is the one that is inserted in the power circuit of the starter.
• the secondary winding circuit W2 is short-circuited.
• the equivalent inductance of the inductive filtering device LPF is between 0.1 and 10 mH approximately for currents having an order of magnitude of 300 to 1000 A.
• the effect of raising the battery voltage obtained stems from the fact that when the DCM motor is energized, the initial peak of current is cut off (attenuated by about half) because of the production of strong currents induced in the secondary circuit W2 bypassed, which oppose by their the effects of the abrupt magnetic flux variation which generated them
• the inductive filtering device LPF essentially comprises a carcass C, Y0, CM, CM 'made of magnetic material such as steel, and primary winding circuits W1 and secondary W2 preferably made of copper.
• the carcass comprises a cylindrical yoke Y0, two closure pieces CM, CM 'and an axial core C around which are arranged the winding circuits W1, W2.
• the winding of the primary winding circuit W1 is formed from a conductor 3 in the form of a flat surface wound on a field, that is to say with the largest L side of the flat surface oriented along the YO yoke radius and the smaller I side oriented axially along the height.
• the winding of the primary winding circuit arranged around the core C in this case comprises a single row of conductors 3 in the radial direction, which gives a compact appearance to the assembly.
• the primary winding circuit W1 has a non-wound direct return 5 so that the input E and the current output S of the primary winding circuit W1 are positioned in the same direction. YO side of the cylinder head.
• This return 5 extends substantially axially in a direction opposite to a winding direction of the layer of the primary winding circuit W1 along said winding.
• the winding of the primary winding circuit W1 is made from a conductor 3 in hand wound on a field on a "go" only to obtain a winding layer thus comprising a single row of conductors in the radial direction, then the conductor 3 is folded along its longer side to achieve the return 5 so as to emerge the current input E and the current output S of the primary winding circuit W1 of the same side.
• the return of the winding could be carried out outside the YO yoke.
• a notch 8 of axial orientation clearly visible in Figures 7 and 8a is formed in an inner face of the yoke YO to receive the return of the conductor 5 inside the carcass.
• the notch 8 has a cross section of shape substantially complementary to that of the flat part of the conductor.
• the notch 8 has a substantially tangential dimension L1 corresponding to the longer side L of the flat and a radial dimension L2 corresponding to the smallest side I of the flat.
• the axial length of the notch 8 corresponds to the length of the return 5.
• the secondary winding circuit W2 is short-circuited.
• the secondary winding circuit W2 comprises in this case several turns forming a coil positioned around the primary winding circuit W1.
• the secondary winding circuit W2 may alternatively be produced in the same way as the primary winding circuit W1, namely from a conductor in the form of a flat surface wound on a field.
• the secondary winding circuit W2 may advantageously consist of a conductive tube (for example copper or aluminum) concentric with the primary winding circuit W1.
• This tube may be located around the primary winding circuit or juxtaposed axially with the primary winding W1 at the bottom of the tank, as described in document PCT / FR201 1/052638.
• Such a structure can lead to an LPF filtering device of simpler embodiment compared to the secondary winding circuit W2 in several turns. It will be noted that the maintenance of an identical length-to-radius ratio, with respect to a secondary winding circuit W2 in several turns, will require a correct dimensioning of the thickness of the tube.
• N2 / N1 which characterizes the transformer provided to pass from a resistance R for N2 turns to a resistance R / N2 2 for a turn with the tube, N2 and N1 being respectively the numbers of turns of the winding circuits W2 and W1.
• the LPF filtering device further comprises a polarization winding circuit PW wound in the opposite direction of the primary winding circuit W1.
• the bias winding circuit PW is arranged around the secondary winding circuit W2.
• the bias winding circuit PW is intended to be connected in the control circuit of the starter. More specifically, the bias winding circuit PW is connected between the negative terminal B of the battery and the starting contact CS of the vehicle.
• Such wiring allows the establishment of a steady-state current in the bias winding circuit PW at the same time as the excitation of the call and hold coils of the electromagnetic contactor EC, i.e. about 25 ms before the closing of the power circuit by the power contact CP.
• the pre-polarization of the magnetic circuit Y0, C before the transient establishment of the power current I makes it possible to benefit from a greater variation in induction, which makes it possible to delay the saturation.
• the DCM electric motor can thus reach a higher rotational speed, and thus generates a higher counter-electromotive force, at the moment of saturation, which contributes to limiting the power current I.
• This second embodiment allows the realization of an optimized LPF filtering device of high efficiency.
• the polarization winding circuit PW may be wound around the axial core C at one end of the primary and secondary windings W1, W2, as described for example in document PCT / FR2012 / 051610.
• the primary winding circuit W1 and / or the secondary winding circuit W2 can be made from several conductors in hand wound on several layers.
• the axial core C may have at least one gap, as described in document PCT / FR2012 / 051568.
• Such an air gap in the magnetic circuit C, Y0, CM, CM ' makes it possible to reach the saturation of this magnetic circuit later.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Motor And Converter Starters (AREA)
• Emergency Protection Circuit Devices (AREA)
• Coils Of Transformers For General Uses (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=49713141

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• 2013
  • 2013-07-01 FR FR1356361A patent/FR3007910B1/fr not_active Expired - Fee Related
• 2014
  • 2014-07-01 WO PCT/FR2014/051683 patent/WO2015001246A2/fr not_active Ceased
  • 2014-07-01 US US14/900,768 patent/US10132285B2/en active Active
  • 2014-07-01 CN CN201480037492.XA patent/CN105358821B/zh active Active
  • 2014-07-01 EP EP14790654.9A patent/EP3017187A2/de not_active Withdrawn

Patent Citations (1)

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