US3735739A - Ignition device for monorotor rotary piston internal combustion engines - Google Patents

Ignition device for monorotor rotary piston internal combustion engines Download PDF

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Publication number
US3735739A
US3735739A US00020661A US3735739DA US3735739A US 3735739 A US3735739 A US 3735739A US 00020661 A US00020661 A US 00020661A US 3735739D A US3735739D A US 3735739DA US 3735739 A US3735739 A US 3735739A
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United States
Prior art keywords
breaker
closing
spark plug
engine
voltage
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Expired - Lifetime
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US00020661A
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English (en)
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J Panhard
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Soc Constructions Mecaniques Panhard & Lavasson fr
Constructions Mecaniques Panhard et Levassor SA
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Constructions Mecaniques Panhard et Levassor SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B53/12—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
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • F02P15/001—Ignition installations adapted to specific engine types
    • F02P15/005—Layout of ignition circuits for rotary- or oscillating piston engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B2053/005—Wankel engines
    • 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
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the ignition device includes a rotary switch for 123/148 E preventing the voltage peak which is produced on the [51] Int. Cl ..F02p 3/02 closing or opening of the breaker f appearing at [58] Fleld of Search ..123/l48 E, 148 DC, the electrodes of the Spark plug h the latter i i a 123/8091 148 combustion chamber of the engine at the beginning of compression.
  • the device may include a cam driven by [56] References C'ted the engine and having an outline of sudden slope.
  • the UNITED STATES PATENTS device has a disruptingeffect sensitive to the direction of flow of the current in the secondary of the ignition 3,584,608 6/1971 Shibagaki ..123/8.09 coil, 2,612,879 10/1952 Hibbard ..l23/8.O9 2,621,312 12/1952 Mascuch ..123/148 A 10 Claims, 5 Drawing Figures SHEET 3 OF 3 IGNITION DEVICE FOR MONOROTOR ROTARY PISTON INTERNAL COMBUSTION ENGINES
  • the present invention relates to an ignition device for a monorotor rotary piston internal combustion engine.
  • a device of this type which includes a breaker, a cam driven by the engine and co-operating with the breaker, an induction coil and a spark plug, said breaker causing, especially on opening, but also on closing of the primary circuit of the coil, a voltage peak of opening and of closing at the terminals of the secondary circuit of the said coil, which is connected to the spark plug.
  • the invention relates more particularly, because it is in this case that its application seems to offer the most advantage, but not exclusively, to those of the abovesaid ignition devices which include two spark plugs displaced in the peripheral direction and, in general, one induction coil and one breaker per spark plug.
  • the ignition device for the rotary piston internal combustion engine defined above is characterized, according to the invention, by the fact that it comprises means adapted to prevent voltage peaks of closing from appearing between the electrodes of the spark plug when this latter is in a combustion chamber of the engine at the beginning of compression.
  • these means are arranged to, on one hand, establish an electrical connection between the spark plug and the secondary of the coil on opening or immediately before opening of the breaker, and on the other hand, to interrupt the said connection on closing or immediately I before closing of the breaker.
  • these means are arranged so that they cause the closing of the breaker before the spark plug is in a combustion chamber at the beginning of compression.
  • the invention also relates to monorotor rotary piston internal combustion engines, characterized by the fact that they include an ignition device such as defined above.
  • FIG. I shows, diagrammatically, a first embodiment of a rotary piston internal combustion engine constructed according to the invention
  • FIG. 2 shows, diagrammatically, a second embodiment of a rotary piston engine constructed according to the invention.
  • FIGS. 3 and 4 show certain elements of the embodiment of FIG. 2 in other operating positions
  • FIG. 5 lastly, shows a third embodiment.
  • an ignition device for a rotary piston internal combustion engine 1 comprising a casing 2 in the form of a trochoid with two lobes, provided with an intake port 3 and an exhaust port 4, and a rotary piston 5 in the form of a curvilinear triangle with three crests 5a, 5b, 5c, rotatable inside the said envelope (in clockwise direction according to FIGS. 1 and 2), the procedure is as follows.
  • a DC. electrical voltage source 6 constituted, for example, by a battery provided with a positive terminal 14 and a negative terminal 7 connected to a common ground 8.
  • It includes, preferably, two spark plugs 9 and 10 mounted in the envelope of the casing 1 and shown diagrammatically in FIGS. 1 and 2. These two spark plugs are separated from one another along the periphery of the envelope of the casing 2, so as to favor the establishment as rapidly as possible of the flame front, over the whole length ofa chamber B which occurs at the end of compression and of which the shape, as seen in FIGS. 1 and 2, is very flattened and elongated.
  • the spark plug 9 is often called the top or upper plug.
  • the spark plug 10 is called the bottom or lower plug.
  • Each of these plugs include two electrodes of which the first is connected to the ground 8 and of which the second is connected in the manner indicated above.
  • two induction coils 11 and 12 provided respectively with primary windings 11a and 12a and with secondary windings 1 1b and 12b.
  • the windings 11a and 11b have a common terminal 13 connected to the positive terminal 14 of the voltage source 6 through an ignition switch 15.
  • the windings 12a and 12b have also a common terminal 16 directly connected to the terminal 13.
  • the primary winding 11a includes a second terminal 17 connected to the ground 8 through a breaker 18 mounted parallel with a condenser 19.
  • the primary winding 12a includes a second terminal 20 connected to the ground 8 by a second breaker 21 mounted parallel with a second condenser 22.
  • the breaker 18 comprises a rigid conductor arm 23, hinged at one of its ends on a fixed axle 24 and bearing, at its other end, a conductive pastille 25, which pastille can come into contact with another fixed pastille 26 connected electrically to the ground 8.
  • the pastille 25 is connected electrically to the terminal 17 of the coil 11 through the arm 23.
  • the latter bears, substantially at its center, an insulating follower 27.
  • the breaker 21 is identical with the breaker 18 and the parts of this breaker analogous to those of the breaker l8 bear the same reference numerals followed by the letter a.
  • the pastille 25a is connected electrically to the terminal 20 of the coil 12.
  • the two breakers l8 and 21 are arranged substantially symmetrically with respect to the axis of rotation ofa cam 28 with two diametrically opposite bosses 29 and 30.
  • the said cam is driven in rotation at a speed proportional to that of the engine and co-operates with the followers 27 and 27a of the breakers so as to allow to come into contact and to separate alternately, on one hand, the pastilles 2S and 26, and on the other hand, the pastilles 25a and 26a.
  • Flexible return means act on the two arms 18 and 23.
  • adjusting means for the advance of the spark may act on the angular adjustment of the cam 28 with respect to the shaft of the engine which is moved by the piston 5.
  • the secondary windings 11b and 12b include, respectively, output terminals 31 and 32. Up to the present, these terminals were, in the case of monorotor rotary piston engines, connected directly and permanently to the second electrode of the plugs 9 and 10, respectively. It will be recalled that the first electrode of the said plugs is connected to the ground 8.
  • the cam 28 separates from one another, simultaneously or with a slight displacement in time, on one hand, the pastilles 25 and 26, and on the other hand, the pastilles 25a and 26a.
  • This magnetic flux variation induces in the secondary windings 11b and 12b a high electrical voltage.
  • the terminals 31 and 32 are thus brought to a high potential with respect to the ground and it is the same for the electrodes of plugs 9 and 10 respectively connected to the terminals 31 and 32.
  • the assembly is constructed in such a way that the difference of potential which appears between the electrodes of the plugs 9 and 10 is sufficient to produce a spark suitable for igniting the compressed mixture in the chamber B.
  • the lower plug 10 connected to this coil, is in the presence of gas under high pressure and the dielectric strength of these gases is high enough for a spark not to flash generally between the electrodes of the plug 10. Even though a spark should flash, it would not be troublesome since it would be produced in a mixture of burnt gases.
  • the crest 5a of the piston, which bounds the rear zone of the chamber B has generally passed by the plug 9.
  • the plug 9 occurs then in a chamber containing a mixture of fresh gas at the beginning of compression.
  • the difference of potential which appears between the electrodes of the plug 9 is sufficient to generate a spark and an untimely pre-ignition of a mixture which has not yet reached the desired level of compression.
  • the spark flashes fairly easily since the mixture is little compressed and possesses hence a relatively low dielectric strength. But such a preignition is troublesome to the good operation of the engine'and is accompanied by a noise similar to a loud clicking and a loss of power.
  • the said means are constituted by a rotary commutator 33 (FIG. 1) rotated by the engine 1 and which, on one hand, establishes an electrical connection between the plug 9 and the coil 11 and between the plug 10 and the coil 12, slightly before and during the opening of the breakers 18 and 21, and on the other hand, interrupts the said connection slightly before and during the closing of the said breakers 18 and 21.
  • a rotary commutator 33 FIG. 1
  • the rotary commutator 33 comprises a rotor 34 and a stator 35.
  • the rotor 34 is composed, on one hand, of a cylindrical crown of revolution 36, conductive at least over its periphery and provided with a radial conductor arm 37 extending towards the outside, on the other hand, of a cylinder 38 conductive at least over its periphery, coaxial with the crown 36 and provided with a radial conductor arm 39 diametrically opposite the arm 37, a part of the cylinder 38 being situated on the inside of the said crown, and finally on the other hand, of an insulator 40 arranged between the crown 36 and the cylinder 38.
  • the position of the arm 39 along the axis of the rotor is such that said arm is insulated electrically from the crown 36.
  • the rotor 34 is driven around its axis at a speed proportional to that of the engine.
  • the stator 35 bears the rotor 34 and comprises two brushes 41,42 and two conductive terminals 43,44 diametrically opposite with respect to the center of the rotor.
  • the brush 41 bears on the outer surface of the cylinder 38 and permits electrical connection to be ensured between the arm 39 and the terminal 32 to which this brush is connected.
  • the brush 42 bears on the outer surface of the crown 36 and ensures the passage of electrical current between the terminal 31, to which it is connected, and the arm 37.
  • the terminals 43 and 44 are arranged so that the arms 37 and 39 come to their contact or a slight distance from the latter on each turn of the rotor. These terminals are connected respectively to the second electrodes of the plugs 9 and 10.
  • the angular displacement of the rotor 34, the angular amplitude of the phase during which there is electrical connection between the arms 37,39 and the terminals 43,44 and the profile of the cam 28 are determined so that the said connection is established slightly before and during the opening of the breakers 18 and 21, but is interrupted before the closing of the breakers.
  • the rotary commutator 33 can include only a single arm 37 and be arranged only in the circuit of the upper plug 9, whilst the low plug 10 is directly connected to the terminal of the output 32 of the coil 12.
  • the spark due to the closing of the breaker 21 is not systematically suppressed on the plug 10, but this is not troublesome since this spark can only be produced in a mixture of burnt gases.
  • the rotary speed given to the rotor 34 there may be provided one or two diametrically opposite terminals and connected electrically between themselves, to come into contact with the single arm 37. 1
  • the abovesaid means to prevent the voltage peak of closing from appearing at the electrodes of each plug, when the latter is in a chamber at the beginning of compression may be constituted by a cam outline 23 such that the closing of the breakers l8 and 21 is produced before the spark plug 9, and all the more so, the plug 10, are in a chamber at the beginning of compression.
  • the terminals 31 and 32 of the secondary windings of the coils are directly connected to the electrodes of the plugs 9 and 10, as in known ignition devices for rotary piston engine.
  • the crest 5a bounding the rear zone of the chamber B has not yet passed by the upper plug 9.
  • the voltage peak of closing is hence applied to the plugs before the peak 5a has passed by the plug 9, and a fortiori, the plug It).
  • the two plugs are again in the chamber B in the pres ence of burnt gases under high pressure, hence at high dielectric strength, little favorable to the flashing of a spark on closing, as explained above. In any case, the flashing of such a spark would not be troublesome since it would be produced in burnt gases.
  • the abovesaid means are constituted, for each induction coil, by a second breaker (45 for coil 11, see FIG. 2) mounted in parallel with the first breaker (18 for the coil ill) and cooperating with the same cam, the assembly being such that any period during which two breakers arranged in a same primary circuit of a coil are open simultaneously is followed by the closing of one of these breakers before the spark plug connected on this coil occurs in a chamber at the beginning of compression.
  • FIG. 2 there is shown very diagrammatically the ignition device.
  • an assembly 46 comprising two breakers 13,45 mounted in parallel.
  • an assembly 47 identical with 46.
  • only a single breaker could be used for the plug 10 since the latter, by reason of its position on the envelope of the casing 2, occurs practically always in the presence of burnt gases when the voltage peak of closing is produced, even if there is only a single breaker in the primary circuit of the coil 12 and if the profile of the cam is not particularly abrupt.
  • the two breakers l8 and 45 can cooperate with a same cam 8 with three bosses for example.
  • the outline of the cam can be normal since the interval of time separating the opening and the closing of a same breaker can be relatively great, whilst the interval of time separating the opening and the closing of the primary circuit is very slight.
  • an ignition device for a rotary piston engine which responds well to the purpose for which it is proposed, namely to obtain undisturbed combustion cycles and to eliminate the pre-ignition of mixtures of fresh gases at the beginning of compression.
  • pre-ignition is eliminated by eliminating the spark of closing.
  • pre-ignition is eliminated by establishing the closing of the breaker before the upper plug 9 has been passed by the crest 5a and occurs in a chamber at the beginning of compression.
  • the means of connection and of disconnection to prevent the voltage peak of closing from appearing between the electrodes of the spark plug, when the latter occurs in a chamber at the beginning of compression can be electronic.
  • the lower spark plug 10 can be directly connected to the terminal 32 of the plug 12, whilst, in the circuit of the upper plug 9, the rotary commutator 33 is replaced by a device with a disruptive effect 49 constructed, on one hand, so
  • a monorotor rotary piston internal combustion engine comprising, a single housing having a multilobed inner peripheral surface, a single multilobed rotor mounted for rotation within said housing, said housing comprising an intake port and an exhaust port; in combination with an ignition system comprising, a breaker, a cam driven by the engine and cooperating with the breaker, an induction coil having a primary circuit and a secondary circuit and at least two spark plugs on said peripheral surface and connected to said secondary circuit operating together, the second said spark plug being located between the first said spark plug and said exhaust port, said breaker causing, particularly on opening but also on closing of the primary circuit of the coil, a voltage peak of opening and of closing respectively at the terminals of said secondary circuit, and interrupting means in said secondary circuit adapted to prevent the voltage peak only of closing of the breaker from appearing at the electrodes of at least said first spark plug when the latter is in a combustion chamber of the engine at the beginning of compression.
  • interrupting means are constituted by a second breaker mounted in parallel with the first and cooperating with a cam, the assembly being such that any period during which the two breakers .are opened simultaneously is followed by the closing of one of the breakers bypassing the voltage surge to the spark plug before the spark plug is in a combustion chamber at the beginning of compression.
  • interrupting means are arranged, on one hand, to establish an electrical connection between the spark plug and the secondary of the coil on opening or immediately before opening of the breaker, and on the other hand, to interrupt said connection on closing or immediately before closing of the breaker.
  • interrupting means are arranged so that they cause the closing of the breaker before the spark plug is in a combustion chamber at the beginning of compression.
  • interrupting means are constituted by a rotary commutator rotated by the engine and have contacts arranged to establish electrical connection between the spark plug and the coil, slightly before and during the opening of the breaker, and to interrupt said connection slightly before and during the closing of the breaker.
  • said interrupting means are sensitive to the voltage at the terminals of the secondary and are constituted by a device with a disrupting effect allowing an electrical current to pass when the voltage at its terminals is of the order of the voltage which appears at the terminals of the secondary of the coil on the opening of the breaker, that is to say of the order of 15,000 to 20,000 volts, and opposing the passage of an electrical current when the voltage at its terminals is of the order of the voltage at the terminals of the secondary on the closing of the breaker, that is to say of the order of 1,500 to 2,500 volts.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US00020661A 1969-03-18 1970-03-18 Ignition device for monorotor rotary piston internal combustion engines Expired - Lifetime US3735739A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6907680A FR2038521A5 (enrdf_load_stackoverflow) 1969-03-18 1969-03-18

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US3735739A true US3735739A (en) 1973-05-29

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US00020661A Expired - Lifetime US3735739A (en) 1969-03-18 1970-03-18 Ignition device for monorotor rotary piston internal combustion engines

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US (1) US3735739A (enrdf_load_stackoverflow)
JP (1) JPS49682B1 (enrdf_load_stackoverflow)
DE (1) DE2012933A1 (enrdf_load_stackoverflow)
ES (1) ES377130A1 (enrdf_load_stackoverflow)
FR (1) FR2038521A5 (enrdf_load_stackoverflow)
GB (1) GB1303538A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868928A (en) * 1971-10-07 1975-03-04 Nissan Motor Ignition system for rotary internal combustion engine
US3919994A (en) * 1974-11-11 1975-11-18 Gen Motors Corp Ignition system for rotary internal combustion engines
US3938489A (en) * 1972-07-04 1976-02-17 Nippondenso Co., Ltd. Ignition system for two-cylinder engines
US3978824A (en) * 1971-11-20 1976-09-07 Daimler-Benz Aktiengesellschaft Rotary piston internal combustion engine of trochoidal construction

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1801608A (en) * 1929-03-19 1931-04-21 North East Appliance Corp Electric ignition apparatus
US1928221A (en) * 1931-04-27 1933-09-26 Delco Remy Corp Ignition apparatus
US1997515A (en) * 1931-03-31 1935-04-09 Ferranti Inc Electric spark discharge system
US2612879A (en) * 1950-09-26 1952-10-07 Elmo Tellbuescher Rotary internal-combustion engine
US2621312A (en) * 1952-12-09 Ignition control
GB930623A (en) * 1960-11-23 1963-07-03 Daimler Benz Ag Improvements relating to rotary-piston internal combustion engines
US3196846A (en) * 1960-05-05 1965-07-27 Daimler Benz Ag Rotary piston engine
US3534717A (en) * 1968-02-27 1970-10-20 Nsu Motorenwerke Ag Rotary piston engine with spark and exhaust temperature control
US3576183A (en) * 1969-10-31 1971-04-27 Kokusan Denki Co Ignition system for a two-cycle engine
US3584608A (en) * 1968-06-03 1971-06-15 Toyo Kogyo Co Ignition system for rotary piston internal combustion engine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2621312A (en) * 1952-12-09 Ignition control
US1801608A (en) * 1929-03-19 1931-04-21 North East Appliance Corp Electric ignition apparatus
US1997515A (en) * 1931-03-31 1935-04-09 Ferranti Inc Electric spark discharge system
US1928221A (en) * 1931-04-27 1933-09-26 Delco Remy Corp Ignition apparatus
US2612879A (en) * 1950-09-26 1952-10-07 Elmo Tellbuescher Rotary internal-combustion engine
US3196846A (en) * 1960-05-05 1965-07-27 Daimler Benz Ag Rotary piston engine
GB930623A (en) * 1960-11-23 1963-07-03 Daimler Benz Ag Improvements relating to rotary-piston internal combustion engines
US3534717A (en) * 1968-02-27 1970-10-20 Nsu Motorenwerke Ag Rotary piston engine with spark and exhaust temperature control
US3584608A (en) * 1968-06-03 1971-06-15 Toyo Kogyo Co Ignition system for rotary piston internal combustion engine
US3576183A (en) * 1969-10-31 1971-04-27 Kokusan Denki Co Ignition system for a two-cycle engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3868928A (en) * 1971-10-07 1975-03-04 Nissan Motor Ignition system for rotary internal combustion engine
US3978824A (en) * 1971-11-20 1976-09-07 Daimler-Benz Aktiengesellschaft Rotary piston internal combustion engine of trochoidal construction
US3938489A (en) * 1972-07-04 1976-02-17 Nippondenso Co., Ltd. Ignition system for two-cylinder engines
US3919994A (en) * 1974-11-11 1975-11-18 Gen Motors Corp Ignition system for rotary internal combustion engines

Also Published As

Publication number Publication date
DE2012933A1 (de) 1970-12-23
JPS49682B1 (enrdf_load_stackoverflow) 1974-01-09
ES377130A1 (es) 1972-12-16
FR2038521A5 (enrdf_load_stackoverflow) 1971-01-08
GB1303538A (enrdf_load_stackoverflow) 1973-01-17

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