JP2010106739A - Multi-ignition type ignition device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition device for an internal combustion engine, surely eliminating spark lack, with reduced manufacturing cost by simple structure, and with reduced size. <P>SOLUTION: In the ignition device, a simultaneous ignition type ignition coil is disposed to each cylinder to supply high voltage to two cylinders by one coil. Coil parts are connected in parallel with each other, in which each coil part is constituted of: a primary coil constituting an ignition coil of two different cylinders; and a power switching element controlling a primary electric current flowing through the primary coil; and a secondary coil. Primary electric currents flowing through two of the primary coils are sequentially switched to continuously generate high-voltage discharge to two ignition plugs installed to a closed circuit to which two of the secondary coils are connected in parallel with each other. Thereby, the spark lack is surely eliminated and the number of ignition coils is minimized, so that the manufacturing cost is reduced with simple structure and the size of the ignition device is reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a multi-ignition internal combustion engine ignition device that generates a plurality of high-voltage discharges in a spark plug in a single ignition operation.

  As an internal combustion engine mounted on a vehicle, a so-called lean combustion engine in which an air-fuel ratio is set thin to improve fuel efficiency is adopted. However, this type of lean combustion engine ignites in a lean state of gasoline, which is an ignition component, compared to a normal engine, so the ignition characteristics are not good, so a high energy type internal combustion engine ignition device is required. Yes. In view of this, a so-called multiple ignition type ignition device is known that causes a spark plug to generate at least two or more high voltage discharges in a predetermined ignition period as disclosed in Japanese Patent Application Laid-Open No. 2002-4495. This multi-ignition type ignition device includes a multiple discharge type in which the high voltage of the DC-DC converter is superimposed on the secondary voltage of the ignition coil, a multi-spark type in which high voltage discharge is continued by repeatedly switching the power switching element, A multi-coil type using a plurality of primary coils, power switching elements, and secondary coils has been proposed.

  However, the conventional overlap discharge type internal combustion engine ignition device requires a DC-DC converter for overlap discharge and an overlap discharge circuit in addition to a normal ignition coil, so that the configuration becomes complicated and the manufacturing cost increases. Was invited. For this reason, it has been difficult to put the ignition device for overlap discharge into practical use. On the other hand, since the conventional multi-spark type ignition device for an internal combustion engine repeatedly switches one ignition coil, high voltage discharge is performed every time the primary current is cut off, but the primary current flows. There was a problem that a secondary current did not flow between them and sparks were cut off because of the high voltage discharge interval. On the other hand, the conventional multi-coil system does not leave a high voltage discharge interval, but requires a plurality of ignition coils, resulting in an increase in manufacturing cost.

Japanese Patent Laid-Open No. 2002-4495

  The present invention has been made to solve the above-described problems, and can surely eliminate a spark break, reduce the manufacturing cost with a simple configuration, and reduce the size. A multi-ignition ignition device for an internal combustion engine is provided.

  The object of the present invention is to connect each secondary coil of at least two ignition coils in parallel, and to connect each cylinder ignition plug to each terminal of the secondary coils connected in parallel. Can be achieved.

  The present invention can reduce burnout without increasing the number of ignition coils.

  As a result, since the configuration is not complicated, the manufacturing cost does not increase so much even though the function and performance are improved. Moreover, the ignition device is not enlarged.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The embodiment of the ignition device for a multi-ignition internal combustion engine of the present invention has the following basic configuration.

  A first ignition coil 1A that constitutes a step-up transformer is provided by the primary coil 3A and the secondary coil 4A.

  A second ignition coil 1D constituting a step-up transformer is provided by the primary coil 3D and the secondary coil 4D.

  One end 4A1 of the secondary coil 4A constituting the first ignition coil 1A is connected to a terminal 62A provided on a connector (not shown) of the first ignition coil 1A, and one cylinder is provided between the terminal 62A and the ground Gr. The first spark plug 61A is connected.

  One end 4D2 of the secondary coil 4D constituting the second ignition coil 1D is connected to a terminal 62D provided on a connector (not shown) of the second ignition coil 1D, and another cylinder is provided between the terminal 62D and the ground Gr. The second spark plug 61D is connected.

  One end of the primary coil 3A constituting the first ignition coil 1A is connected to the positive electrode of the power source 31 via a terminal 31A provided on a connector (not shown) of the first ignition coil 1A.

  The other end of the primary coil 3A constituting the first ignition coil 1A is connected to the ground via the first switching semiconductor element 5A, and the current flowing through the primary coil 3A is cut off by the first switching semiconductor element 5A. Is done.

  One end of the primary coil 3D constituting the second ignition coil 1D is connected to the positive electrode of the power source 31 via a terminal 31D provided on a connector (not shown) of the second ignition coil 1D.

  The other end of the primary coil 3D constituting the second ignition coil 1D is connected to the ground via the second switching semiconductor element 5D, and the current flowing through the primary coil 3D is cut off by the second switching semiconductor element 5D. Is done.

  Furthermore, one end 4D1 of the secondary coil 4D constituting the second ignition coil 1D is connected to a terminal 42 provided on a connector (not shown) of the second ignition coil 1D. The terminal 42 is connected to a terminal 44 provided on a connector (not shown) of the first ignition coil 1A by a conductor 43. The terminal 44 is connected to one end 4A1 of the secondary coil 4A inside the first ignition coil 1A. As a result, the first spark plug 61A is also connected between the one end 4D1 of the secondary coil 4D constituting the second ignition coil 1D and the ground.

  On the other hand, one end 4A2 of the secondary coil 4A of the first ignition coil 1A is connected to a terminal 47 provided on a connector (not shown) of the first ignition coil 1A. The terminal 47 is connected by a conductor 46 to a terminal 45 provided on a connector (not shown) of the second ignition coil 1D, and the terminal 45 is connected to one end 4D2 of the secondary coil 4D inside the second ignition coil 1D. As a result, the second ignition plug 61D is also connected between the one end 4A2 of the secondary coil 4A constituting the first ignition coil 1A and the ground.

  Thus, the secondary coil 4A of the first ignition coil 1A and the secondary coil 4D of the second ignition coil 1D are connected in parallel, and the first spark plug 61A is connected to one connection terminal of both the secondary coils. A second spark plug 61D is connected to the other connection terminal of both the secondary coils.

  In the embodiment, a high-voltage diode 51A that allows current to flow only from the ground to the one end 4A1 of the secondary coil 4A that constitutes the first ignition coil 1A via the first ignition plug 61A is provided. The secondary coil 4A is connected in the middle of the conductor connecting the one end 4A1 of the secondary coil 4A and the terminal 62A.

  In the embodiment configured in this manner, the first switching semiconductor element 5A is energized in a predetermined section (T1 in the waveform diagram SA of FIG. 2) and then flows after the current I1A flows (the waveform diagram SA, FIG. 2). Current I2A (waveform I2A in FIG. 2) flows through the secondary coil 4A, and a high voltage is induced in the secondary coil 4A. This high voltage causes a discharge in the first and second spark plugs.

  Then, in a later stage during energization of the primary coil 3A, the second switching semiconductor element 5D is energized for a predetermined period (t1 in the waveform diagram SD of FIG. 2), and a current I1D flows through the primary coil 3D of the second ignition coil 1D. Then, when it is shut off (see waveform diagrams SD and I1D in FIG. 2), a current I2D (broken line waveform I2D in FIG. 2) flows through the secondary coil 4D, and a high voltage is induced in the secondary coil 4D. This high voltage causes a discharge in the first and second spark plugs.

  At this time, the discharge current I2E flowing in the secondary coils 4A and 4D by the induced voltage generated in the secondary coils 4A and 4D is secondary to the current I2A flowing in the secondary coil 4A as shown in the waveform diagram I2E of FIG. The current I2D flowing through the coil 4D becomes a superimposed current, and its magnitude and discharge time increase dramatically.

  In addition, it is preferable that the terminals 31A, 44, 47, 53A and 62A of the first ignition coil 1A are collected at one place on the outer wall surface of the coil.

  The terminals 31D, 42, 45, 53D and 62D of the second ignition coil 1D are preferably grouped at one place on the outer wall surface of the coil.

  In FIG. 1, the first switching semiconductor element 5A and the second switching semiconductor element 5D are shown as a single element. However, as a so-called igniter, a current limiting circuit, a current control circuit, or an energization time control circuit is incorporated together. The integrated circuit may be configured as a one-chip type.

  According to this embodiment configured as described above, the one end 4A2 of the secondary coil 4A of the first ignition coil 1A2, the connection conductor 46, the second spark plug 61D, the ground Gr, the first spark plug 61A, and the diode 51A. (Forward direction) and a closed circuit passing through one end 4A1 of the secondary coil 4A is configured.

  Also, one end 4D2 of the secondary coil 4D of the second ignition coil 1D2, the second spark plug 61D, the ground Gr, the first spark plug 61A, the diode 51A (forward direction), the connection conductor 43, and the secondary coil 4D. A closed circuit passing through one end 4D1 is formed.

  The current flowing through the two closed circuits is a current I2E in the forward direction with respect to the diode 51 and in the same direction with respect to the two plugs.

  In addition, the current flowing through the common circuit portion of the two closed circuits (one end 4D2 of the secondary coil 4D2, the second spark plug 61D, the ground Gr, the first spark plug 61A, the diode 51A, the one end 4A1 of the secondary coil 4A). Are in the same direction.

  FIG. 1 is a block circuit diagram showing a configuration of an internal combustion engine ignition device according to an embodiment of the present invention. In FIG. 1, this ignition device includes simultaneous ignition type ignition coils 1A and 1D, a battery 31, an ignition signal output circuit 41, a high voltage diode 51A, a first ignition plug 61A, and a second ignition connected in parallel. It is composed of a spark plug 61D. Reference numeral 31 denotes a battery whose cathode is grounded, and 41 denotes an ignition signal output circuit, which supplies the ignition signals SA and SD to the first switching semiconductor element 5A and the second switching semiconductor element 5D, respectively. The high voltage diode 51A is connected between the secondary coils 4A and 4D and the first spark plug 61A and the second spark plug 61D so that a current always flows in only one direction.

  The above-described simultaneous ignition type ignition coil 1A includes an iron core 2A, a primary coil 3A wound around the iron core 2A, a secondary coil 4A, and a first switching semiconductor element 5A that switches a primary current I1A of the primary coil 3A. It is configured. As the first switching semiconductor element 5A, an IGBT or a power transistor is used, arranged on the low voltage side of the primary coil 3A, the collector is connected to the low voltage side of the primary coil 3A, and the emitter is grounded. Similarly, the simultaneous ignition type ignition coil 1D includes an iron core 2D, a primary coil 3D wound around the iron core 2D, a secondary coil 4D, and a second switching semiconductor element 5D that switches a primary current I1D of the primary coil 3D. It is configured. An IGBT or a power transistor is used as the second switching semiconductor element 5D, and is disposed on the low voltage side of the primary coil 3D, the collector is connected to the low voltage side of the primary coil 3D, and the emitter is grounded.

  FIG. 2 is a waveform diagram of each part in the internal combustion engine ignition device shown in FIG. In FIG. 2, SA is an ignition signal output from the ignition signal output circuit 41 to the gate or base of the first switching semiconductor element 5A, I1A is a primary current flowing through the primary coil 3A, and I2A is flowing through the secondary coil 4A. Secondary current, SD is an ignition signal output from the ignition signal output circuit 41 to the gate or base of the second switching semiconductor element 5D, I1D is a primary current flowing through the primary coil 3D, and I2D is a secondary current flowing through the secondary coil 4B. Indicates current. I2E is a discharge current flowing through a circuit composed of the secondary coils 4A and 4D, the first spark plug 61A, and the second spark plug 61D, and has a waveform obtained by adding the secondary current I2A and the secondary current I2D.

  Next, the operation in the case of a four-cylinder engine will be described using the block circuit diagram of FIG. Simultaneous ignition type ignition coils 1A, 1B, 1C, and 1D that can supply high voltage to two cylinders with one coil are arranged in each cylinder, and two different cylinders (the ignition order of a four-cylinder engine is the first In the order of cylinder-third cylinder-fourth cylinder-second cylinder, the first cylinder and the fourth cylinder, and the third cylinder and the second cylinder) are combined. First, when a voltage is supplied from the battery 31 to the primary coils 3A, 3B, 3C, 3D, and the ignition signals SA, SB, SC, SD are output from the ignition signal output circuit 41, the first time when the ignition signal SA is at a high level. When the first switching semiconductor element 5A is turned on and the primary current I1A flows through the primary coil 3A and the ignition signal SA becomes low level, the first switching semiconductor element 5A is turned off, and the primary current of the primary coil 3A I1A is blocked. When the primary current I1A is cut off, the secondary current I2A flows through the secondary coil 4A. Similarly, when the ignition signal SD is at a high level, the second switching semiconductor element 5D is turned on, the primary current I1D flows through the primary coil 3D, and the ignition signal SD becomes a low level, whereby the second switching semiconductor element 5D is turned on. 5D is turned off, and the primary current I1D of the primary coil 3D is cut off. When the primary current I1D is cut off, the secondary current I2D flows through the secondary coil 4D. By appropriately controlling the on and off timings of the ignition signals SA and SD, the discharge current I2E obtained by adding the secondary current I2A and the secondary current I2D to the first spark plug 61A and the second spark plug 61D. A high voltage spark discharge is generated. Further, when the ignition signal SB is at a high level, the power switching element 5B is turned on and the primary current I1B flows through the primary coil 3B. When the ignition signal SB is at a low level, the power switching element 5B is turned off, and the primary coil The 3B primary current I1B is cut off. When the primary current I1B is cut off, the secondary current I2B flows through the secondary coil 4B. Similarly, when the ignition signal SC is at a high level, the power switching element 5C is turned on and the primary current I1C flows through the primary coil 3C. When the ignition signal SC is at a low level, the power switching element 5C is turned off, and the primary The primary current I1C of the coil 3C is cut off. When the primary current I1C is cut off, the secondary current I2C flows through the secondary coil 4C. By appropriately controlling the on / off timing of the ignition signals SB and SC, a discharge current I2F obtained by adding the secondary current I2B and the secondary current I2C flows to the spark plugs 61B and 61C, and a high voltage spark discharge is generated. appear.

  As described above, in the case of a four-cylinder engine, one ignition coil 1A, 1B, 1C, 1D that can supply a high voltage to two cylinders with one coil is arranged in each cylinder, and two different ignition coils are provided. By combining the simultaneous ignition type ignition coils 1A and 1D, 1B and 1C of the cylinders, high voltage discharge is performed in order on the four first spark plugs 61A, spark plug 61B, spark plug 61C and second spark plug 61D. Can be generated. Similarly, the present invention can be applied to an even-cylinder 4-cycle engine such as a 2-cylinder, a 6-cylinder, an 8-cylinder, a 10-cylinder, and a 12-cylinder.

  As described above, by performing appropriate control with the above-described configuration, it is possible to reliably eliminate a spark and to minimize the number of ignition coils, and thus it is possible to reduce the manufacturing cost with a simple configuration. In addition, the ignition device can be reduced in size.

  The embodiment of this example is as follows.

  In the present embodiment, one simultaneous ignition type ignition coil that can supply a high voltage at the same time or slightly shifted timing to two adjacent cylinders at the same timing is arranged for each cylinder.

  Each of ignition coils (equipped with a coil part composed of a primary coil and a secondary coil and an igniter including a power switching element for controlling a primary current flowing in the primary coil) mounted on two specific cylinders The primary currents flowing through the primary coils are switched at specific ignition timings at the same time or slightly shifted in timing.

  A high voltage is generated in the two secondary coils at the same time or at slightly shifted timing.

  The two secondary coils are connected in parallel, and one spark plug of a different cylinder is connected between each of the parallel connection points formed at both ends of the two secondary coils and the ground. .

  Thus, the induced voltages of the two secondary coils are superimposed on the two plugs in the same manner, and the discharge time is long and a large discharge current is obtained, so that ignition is ensured.

  The problems to be solved by the embodiments are summarized as follows.

  A conventional overlap discharge type internal combustion engine ignition device requires a DC-DC converter for overlap discharge and an overlap discharge circuit in addition to a normal ignition coil. Therefore, the configuration becomes complicated and the manufacturing cost increases. It was. For this reason, it has been difficult to put the ignition device for overlap discharge into practical use. On the other hand, since the conventional multi-spark type ignition device for an internal combustion engine repeatedly switches one ignition coil, high voltage discharge is performed every time the primary current is cut off, but the primary current flows. There was a problem that a secondary current did not flow between them and sparks were cut off because of the high voltage discharge interval. On the other hand, the conventional multi-coil system does not leave a high voltage discharge interval, but requires a plurality of ignition coils, resulting in an increase in manufacturing cost.

  In the present embodiment, the above-described problems can be solved, sparks can be surely eliminated, the manufacturing cost can be reduced with a simple configuration, and the size can be reduced. An ignition device for an internal combustion engine is provided.

  The means for solving the problems in this embodiment are as follows.

  According to the present embodiment, one simultaneous ignition type ignition coil capable of supplying a high voltage to two cylinders with one coil is arranged in each cylinder, and the primary coil and the primary coil constituting the ignition coils of two different cylinders are arranged. Two secondary coils are connected in parallel by connecting in parallel a power switching element that controls the flowing primary current and a coil part composed of a secondary coil and sequentially switching the primary currents of the two primary coils. High voltage discharge can be continuously generated in the two spark plugs installed in the closed circuit connected to.

  The effects of the present embodiment are as follows.

  Since it is possible to reliably eliminate sparks and minimize the number of ignition coils, the manufacturing cost can be reduced with a simple configuration, and the ignition device can be downsized.

  In the present invention, the ignition coil itself is a stick type to be installed in the plug hole, a plug top type to be attached to the upper part of the plug hole, or a plurality of coils are attached at one place, and the coil and the plug are connected by a high voltage cable. It can be applied to any of the separate types.

1 is a block circuit diagram showing a configuration of an internal combustion engine ignition device according to an embodiment of the present invention. FIG. 2 is a waveform diagram of each part in the internal combustion engine ignition device shown in FIG. 1. The block circuit diagram (example) which shows the structure in the case of a 4-cylinder engine.

Explanation of symbols

1A First ignition coil (simultaneous ignition type ignition coil (first cylinder))
1B Simultaneous ignition type ignition coil (2nd cylinder)
1C Simultaneous ignition type ignition coil (3rd cylinder)
1D 2nd ignition coil (simultaneous ignition type ignition coil (4th cylinder))
2A, 2B, 2C, 2D Iron cores 3A, 3B, 3C, 3D Primary coils 4A, 4B, 4C, 4D Secondary coils 5A, 5B, 5C, 5D Switching semiconductor element 31 Battery 41 Ignition signal output circuit 51A, 51B High voltage diode 61A Spark plug (first cylinder)
61B Spark plug (2nd cylinder)
61C Spark plug (3rd cylinder)
61D Spark plug (4th cylinder)
I1A, I1B, I1C, I1D Primary currents I2A, I2B, I2C, I2D Secondary currents SA, SB, SC, SD Ignition signal I2E Discharge current (first and fourth cylinders)
I2F discharge current (2nd and 3rd cylinders)

Claims (5)

A first ignition coil having a step-up transformer configured by a primary coil and a secondary coil;
A second ignition coil having a step-up transformer constituted by another primary coil and a secondary coil;
A first spark plug of one cylinder is connected between one end of the secondary coil of the first ignition coil and the ground;
A second spark plug of another cylinder is connected between the other end of the secondary coil of the first ignition coil and the ground;
The current of the primary coil of the first ignition coil is cut off by the first switching semiconductor element;
The current of the primary coil of the second ignition coil is cut off by the second switching semiconductor element;
The first spark plug is connected between one end of the secondary coil of the second ignition coil and the ground;
A multi-ignition type combustion engine ignition device in which the second ignition plug is connected between the other end of the secondary coil of the first ignition coil and the ground. 2. The ignition device for an internal combustion engine according to claim 1, wherein the ignition coil is formed in a cylindrical shape that is accommodated in each plug hole.   2. The ignition device for an internal combustion engine according to claim 1, wherein the ignition coil is disposed above each plug hole, and a high-voltage conductor that connects the ignition coil to the ignition plug is provided in the resin cylinder portion. And an ignition device for a multi-ignition internal combustion engine in which the ignition coil housing portion is unitized. The ignition device for a multi-ignition internal combustion engine, wherein the first and second ignition plugs according to claim 1 are ignition plugs whose ignition timing is simultaneous or adjacent to each other. 2. The ignition device for a multi-ignition internal combustion engine, wherein the first and second ignition coils according to claim 1 include a pair of connection terminal portions for connecting terminals connected to the same spark plug.

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