EP0635856A1 - Zündspule - Google Patents

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Publication number
EP0635856A1
EP0635856A1 EP94109288A EP94109288A EP0635856A1 EP 0635856 A1 EP0635856 A1 EP 0635856A1 EP 94109288 A EP94109288 A EP 94109288A EP 94109288 A EP94109288 A EP 94109288A EP 0635856 A1 EP0635856 A1 EP 0635856A1
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
iron core
ignition coil
sectional area
cross
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94109288A
Other languages
English (en)
French (fr)
Other versions
EP0635856B1 (de
Inventor
Tetsuya Miwa
Yasuo Tsuzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
NipponDenso Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Publication of EP0635856A1 publication Critical patent/EP0635856A1/de
Application granted granted Critical
Publication of EP0635856B1 publication Critical patent/EP0635856B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • 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
    • F02P1/00—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage

Definitions

  • the present invention relates to an improved ignition coil mainly used for internal combustion engines for vehicles.
  • FIG. 6 is a schematic view showing a fundamental magnetic circuit of an iron core which has a permanent magnet inserted into an air gap portion of the ignition coil. In a magnetic circuit shown in Fig.
  • reference mark SF is a cross-sectional area of the iron core through which magnetic flux ⁇ flows
  • SG is a cross-sectional area of a permanent magnet supporting portion of the iron core
  • LF is a mean magnetic path length
  • SM is a cross-sectional area of the permanent magnet which is hatched
  • LM is a thickness of the permanent magnet.
  • Figs. 7 and 8 are performance characteristic diagrams for illustrating magnetic performance of the ignition coil according to the above Japanese Patent Publication.
  • a curve (a) represents a magnetization characteristic of the iron core
  • a straight line (b) represents a magnetization characteristic of the permanent magnet
  • a curve (c) represents a magnetization characteristic of the primary winding.
  • the maximum working magnetic flux density BF of the iron core is given by a value corresponding to a point T which is a tangent point on the curve (a) with a straight line being parallel to the straight line (b) as a resultant summation of (a) and (b).
  • the gradient of the magnetization curve of the primary winding is determined by permeability ⁇ of the permanent magnet, it is of significance that a permanent magnet material which has a permeability value close to 1 should be selected in order to increase the energy stored in the primary winding represented by a hatched area W in Fig. 8, so that the permeability value close to 1 may contribute as an air gap which stores energy and to decline the magnetization curve of the primary winding shown in Fig. 8.
  • nIp/2 HF ⁇ LF + H ⁇ LM
  • H (nIp/2 - HF ⁇ LF)/LM [AT/m]
  • BG ⁇ SG BF ⁇ SF
  • LM [SG/SF] ⁇ [ ⁇ (nIp/2 - HF ⁇ LF)/BF]
  • SG/SF 2 ⁇ BF ⁇ LM / [ ⁇ (nIp - 2HF ⁇ LF)] (1)
  • the iron core is required to be magnetized by magnetizing force of the primary winding in opposition to energy possessed by the permanent magnet, so that positive flux may pass through the iron core. Therefore, where the iron core is first magnetized to the point P close to the saturation point in the negative flux region of the iron core depicted in the lower left region in Fig. 8 by the magnetizing force of the permanent magnet as described previously. Thereafter the iron core is magnetized to the point T near the saturation point in the positive flux region depicted at upper right region in Fig. 8 by the magnetizing force nIp due to the exciting current Ip through the primary winding.
  • SmCo5 sinarium cobalt
  • the iron core is formed of non-oriented silicon steel plates and value of elements therefore are as follows.
  • the value of the elements are substituted into the equations (1) and (2) to obtain the relationship between LM and each area ratio SG/SF and SM/SF are graphically shown in Figs. 10 and 11. Illustrated in Figs.
  • a secondary voltage V2 generated in the secondary winding which is obtained from performance tests conducted for various ignition coils which have different dimensions of individual portions depending on the changes in thickness LM of the permanent magnet.
  • Fig. 11 shows distribution curves of the secondary voltage V2 shown in Fig. 10 after converting them into a two-dimensional characteristic curve and as a relationship between the thickness LM of the permanent magnet and the magnitude of the secondary voltage V2.
  • the ignition coil in the prior art described hereinabove and illustrated in Fig. 17 is mostly effective in a highly sophisticated ignition system which may supply 6A (Amperes) drive current constantly to the primary winding which has less than one ohm resistance even in a case when a battery voltage dropped below the specified value as to maximize the magnetic flux density.
  • 6A Amperes
  • the relationship between the primary cut-off current and secondary output voltage (I1-V2) of the ignition coil in the prior art which has no permanent magnet but has the same secondary output voltage at the same primary current of 6A is graphically compared in Fig. 12 by a solid and dotted lines respectively.
  • the output performance at around 3A primary current range becomes very important, particularly in an engine cranking time under high temperature and low battery voltage.
  • thickness LM of a permanent magnet and SM/SF ratio between two cross-sectional areas SM and SF are chosen as follows so that the working magnetizing zone of a primary winding does not reside in the curved zone of magnetization characteristics in the negative region as illustrated in Fig. 4. 0.6 mm ⁇ LM ⁇ 1.8 mm and 1.3 ⁇ SM/SF ⁇ 3.0
  • Fig. 1 is a sectional view of an ignition coil according to an embodiment of this invention and Fig. 2 is a side view of the same.
  • an iron core 1 is made by laminated non-oriented silicone steel sheets and forms closed magnetic flux circuit via an air gap 2 diagonally arranged in the iron core 1.
  • a permanent magnet 4 is inserted into the air gap 2 of the iron core 1.
  • a primary winding 6 is wound on the iron core 1.
  • the permanent magnet 4 is magnetized in the opposite direction to the direction of magnetization by the exciting current flowing through the primary winding 6.
  • Electrical resistance of the primary winding 6 in case of this embodiment is made to be more than 1 ohm.
  • a secondary winding 8 is wound on the primary winding 6.
  • the mutual relationship between of thickness LM of the permanent magnet 2, diagonal cross-sectional area SM of the permanent magnet 4 and non-diagonal or normal cross-sectional area SF of the iron core 1 at the winding portion is selected to satisfy the following condition.
  • the diagonal cross-sectional area SG of the iron core 1 at the air gap portion is so formed as to be nearly equal to the cross-sectional are SM of the permanent magnet 4. 0.6 mm ⁇ LM ⁇ 1.8 mm 1.3 ⁇ SM/SF ⁇ 3.0
  • Fig. 4 Left lower side of Fig. 4 illustrates that magnetization by the primary winding in the negative region does not come to the magnetic saturation zone. Excessively small negative bias of the permanent magnet causes counter-effect for purpose to minimize the ignition coil. Practically, in case when the thickness LM of the permanent magnet 4 is the same as that of the prior art, the cross-sectional area SM of the permanent magnet results in roughly 2/3 of that of the permanent magnet applied in the prior art.
  • Thickness LM of the permanent magnet 4 of the present invention is selected within the same range (0.6 mm ⁇ LM ⁇ 1.8 mm) of that of the prior art, because this range provides maximum secondary voltage V2 as indicated in Fig. 11.
  • the ignition coil of the present invention may use its straight line portion as the magnetization curve for the primary winding by the introduction of the 2/3 factor and SM/SF ratio of 1.5.
  • the stored energy W' 1.5 on the lower current range is approximately equal to the energy W' of ignition coil which has no permanent magnet.
  • Fig. 5 shows that there is no difference in the secondary output voltage V2 versus cut-off current of the primary winding 6 of both ignition coils of the present invention and the prior art which has no permanent magnet.
  • the ignition coil includes an iron core (1) forming a closed magnetic circuit through an air gap (2), a primary winding (6) wound around the iron core (1) for magnetizing the iron core (1) and a permanent magnet (4) magnetized in an opposite direction to a magnetizing direction by the primary winding current.
  • a cross-sectional area (SG) of the iron core (1) at which the permanent magnet (4) is inserted is made substantially equal to that (SM) of the permanent magnet (4).
  • the permanent magnet (4) In order for the permanent magnet (4) to bias by 2/3 of the magnetic flux saturation point of the iron core (1), the permanent magnet (4) is so shaped that its thickness (LM) satisfies 0.6 mm ⁇ LM ⁇ 1.8 mm and its cross-sectional area (SM) and the cross-sectional area (SF) of winding portion of the iron core (1) satisfies 1.3 ⁇ SM/SF ⁇ 3.0.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP94109288A 1993-06-18 1994-06-16 Zündspule Expired - Lifetime EP0635856B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP14793693A JP3391049B2 (ja) 1993-06-18 1993-06-18 点火コイル
JP147936/93 1993-06-18
JP14793693 1993-06-18

Publications (2)

Publication Number Publication Date
EP0635856A1 true EP0635856A1 (de) 1995-01-25
EP0635856B1 EP0635856B1 (de) 2000-09-13

Family

ID=15441417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94109288A Expired - Lifetime EP0635856B1 (de) 1993-06-18 1994-06-16 Zündspule

Country Status (4)

Country Link
EP (1) EP0635856B1 (de)
JP (1) JP3391049B2 (de)
KR (1) KR100242545B1 (de)
DE (1) DE69425853T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006034574B4 (de) * 2006-01-31 2019-08-29 Mitsubishi Electric Corp. Zündspulenvorrichtung für einen Verbrennungsmotor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3031158U (ja) * 1996-05-14 1996-11-22 阪神エレクトリック株式会社 内燃機関用点火コイル
EP3765730A1 (de) * 2018-03-12 2021-01-20 Diamond Electric MFG. Corp. System und verfahren für verstärkte nichtlineare zündspule

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE656392C (de) * 1936-02-27 1938-02-04 Magnetos R B Soc D Zuendspule
DE1464202A1 (de) * 1962-02-23 1969-05-22 Licentia Gmbh Permanentvormagnetisiertes induktives Element
FR2464543A1 (fr) * 1979-09-04 1981-03-06 Bbc Brown Boveri & Cie Accumulateur d'energie magnetique
EP0043744A1 (de) * 1980-07-04 1982-01-13 DUCELLIER & Cie Zündspule für Brennkraftmaschine
EP0352453A1 (de) * 1988-07-28 1990-01-31 Nippondenso Co., Ltd. Zündspule
EP0431322A1 (de) * 1989-11-10 1991-06-12 Nippondenso Co., Ltd. Zündspule

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE656392C (de) * 1936-02-27 1938-02-04 Magnetos R B Soc D Zuendspule
DE1464202A1 (de) * 1962-02-23 1969-05-22 Licentia Gmbh Permanentvormagnetisiertes induktives Element
FR2464543A1 (fr) * 1979-09-04 1981-03-06 Bbc Brown Boveri & Cie Accumulateur d'energie magnetique
EP0043744A1 (de) * 1980-07-04 1982-01-13 DUCELLIER & Cie Zündspule für Brennkraftmaschine
EP0352453A1 (de) * 1988-07-28 1990-01-31 Nippondenso Co., Ltd. Zündspule
EP0431322A1 (de) * 1989-11-10 1991-06-12 Nippondenso Co., Ltd. Zündspule

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006034574B4 (de) * 2006-01-31 2019-08-29 Mitsubishi Electric Corp. Zündspulenvorrichtung für einen Verbrennungsmotor

Also Published As

Publication number Publication date
KR950001091A (ko) 1995-01-03
DE69425853T2 (de) 2001-03-15
KR100242545B1 (ko) 2000-03-02
JPH0722256A (ja) 1995-01-24
DE69425853D1 (de) 2000-10-19
EP0635856B1 (de) 2000-09-13
JP3391049B2 (ja) 2003-03-31

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