JP3555434B2 - Internal combustion engine ignition unit - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an internal combustion engine ignition device unit that generates a high voltage for ignition of an internal combustion engine by controlling a current flowing through an ignition power supply coil by a main switching element.
[0002]
[Prior art]
FIGS. 10A, 10B and 11 show the structure of a conventional internal combustion engine ignition device unit 1 of this type.
[0003]
This internal combustion engine ignition device unit 1 has an ignition power supply coil 2 for inducing at least one cycle of AC voltage during one rotation of an internal combustion engine (not shown). The ignition power supply coil 2 includes a primary coil 3a of the ignition coil 3 including a primary coil 3a and a secondary coil 3b. This ignition coil 3 constitutes a boosting means for generating an ignition high voltage by boosting an AC voltage induced in the ignition power supply coil 2 when a main switching element to be described later is turned off. One end of the primary coil 3a is connected to one end of the secondary coil 3b, and the other end of the primary coil 3a is grounded. The high voltage induced at the other end of the secondary coil 3b is applied to a spark plug 4 of the internal combustion engine existing outside the internal combustion engine ignition device unit 1.
[0004]
The primary coil 3a and the secondary coil 3b are wound around a bobbin 5 made of insulating resin such that the primary coil 3a is inside and the secondary coil 3b is outside. In the axis of the bobbin 5, an iron core insertion hole 7 for inserting the iron core 6 of the ignition coil 3 is provided therethrough. The iron core 6 periodically faces a magnetic pole of a permanent magnet provided on the outer periphery of a rotor of a magnet generator (not shown).
[0005]
The AC voltage induced by the ignition power supply coil 2 is applied to the control circuit 8. The control circuit 8 conducts when an AC voltage induced by the ignition power supply coil 2 is generated, and the main switching element 9 including an NPN transistor that substantially short-circuits the ignition power supply coil 2 and the main switching element 9 are conducting. When the voltage across the ignition power supply coil 2 reaches a predetermined level, the control element 10 composed of an NPN transistor that performs a control operation of turning off the main switching element 9 and the control element 10 composed of this transistor conduct. A trigger signal supply circuit 11 for providing a trigger signal for determining a timing is provided, and a high voltage is induced in the ignition power supply coil 2 by shutting off the main switching element 9. In FIG. 11, R1 is a base resistance of the main switching element 9 composed of a transistor, R2 is a collector resistance of a control element 10 composed of a transistor, and R3 and R4 are voltage dividing resistances constituting the trigger signal supply circuit 11. The control circuit 8 is configured on a circuit board (not shown), and is configured as a unitized control circuit unit 13 by covering the circuit board with a resin 12.
[0006]
Of the pair of leads 14 and 15 drawn from the control circuit unit 13, the lead 14 is connected to a primary terminal 16 provided on the bobbin 5, and the primary terminal 16 is connected to one end of the primary coil 3a. It is connected to the. Lead wire 14 is connected to ground terminal 17. These terminals 16 and 17 are supported by the bobbin 5.
[0007]
The other end of the secondary coil 3b is connected to the ignition plug 4 via a high voltage terminal 18 and a high voltage cord (not shown) connected thereto. The high voltage terminal 18 is surrounded by a high voltage cord holding cylinder 19. The high-pressure cord holding cylinder 19 is supported by the bobbin 5.
[0008]
Such an internal combustion engine ignition device unit 1 is housed in a case 20 made of insulating resin. In particular, the control circuit unit 13 is housed in a circuit unit housing chamber 21 in the case 20. The case 20 is filled with an insulating resin, not shown, including the circuit unit housing chamber 21.
[0009]
In an internal combustion engine provided with such an internal combustion engine ignition device unit 1, when a start operation of the engine is performed, an AC voltage is induced in the ignition power supply coil 2 as the rotor of the magnet generator rotates. When a half-cycle voltage of one polarity is induced in the ignition power supply coil 2, a base current is applied to the main switching element 9 composed of a transistor through the resistors R2 and R1, so that the main switching element 9 is turned on and the ignition power supply is turned on. A short-circuit current flows from the coil 2 to between the collector and the emitter of the main switching element 9. When it is detected that the current flowing through the ignition power supply coil 2 has reached a predetermined cutoff value and the voltage across the ignition power supply coil 2 has reached a set value, the control element 10 made up of a transistor is turned on to perform main switching. Since the base current of the element 9 is bypassed from the main switching element 9, the main switching element 9 is turned off. As a result, the current flowing through the ignition power supply coil 2 is cut off, so that a voltage having a high polarity that intends to continue the current that has flowed so far is applied to the ignition power supply coil 2 (that is, the primary coil 3a). Induce. This induced voltage is boosted to a high voltage for ignition by a booster comprising an ignition coil 3, and the high voltage for ignition is applied to a spark plug 4 attached to a cylinder of the internal combustion engine. The engine is ignited by spark discharge generated in the ignition plug 4 when the high voltage for ignition is applied.
[0010]
In such an internal combustion engine ignition device unit 1, it is necessary to advance the ignition timing according to the rotation speed of the internal combustion engine. However, in this type of conventional transistor-type internal combustion engine ignition device unit 1, the advance of the ignition timing is of a degree that prevents click-in, and the advance width is approximately 8 ° to 10 °.
[0011]
However, in the current internal combustion engine, there is a demand for an advance angle width of 20 ° or more depending on the application.
[0012]
[Problems to be solved by the invention]
However, in the conventional internal combustion engine ignition device unit 1 of this type, it is impossible for the control circuit unit 13 with a simple waveform advance system to secure the advance angle width of 20 ° with one control circuit unit 13.
[0013]
Also, if the control circuit 8 of the waveform advancing type is also complicated, the control circuit unit 13 can be used if the circuit is complicated. However, in this case, the control circuit 8 becomes very complicated and the cost increases. Was.
[0014]
SUMMARY OF THE INVENTION An object of the present invention is to provide an internal combustion engine ignition device unit capable of increasing the advance width of ignition timing at a relatively low cost.
[0015]
Another object of the present invention is to provide an internal combustion engine ignition device unit that can achieve commonality of parts in a case where the advance width of the ignition timing may be relatively narrow and in a case where the advance width of the ignition timing is required to be wide. To provide.
[0016]
[Means for Solving the Problems]
An internal combustion engine ignition device unit to be improved by the invention according to claim 1 is:
An ignition power coil for inducing at least one cycle of an AC voltage during one revolution of the internal combustion engine;
A main switching element that conducts when an AC voltage induced by the ignition power supply coil is generated and substantially short-circuits the ignition power supply coil; and a voltage at both ends of the ignition power supply coil when the main switching element is conducting is a predetermined level. And a control element for performing a control operation of turning off the main switching element when the voltage reaches the peak value or the peak value, and a control circuit for inducing a high voltage in the ignition power supply coil by shutting off the main switching element is unitized. Control circuit unit,
Boosting means for generating an ignition high voltage by boosting an AC voltage induced in the ignition power supply coil when the main switching element is turned off,
It has a structure in which at least the control circuit unit and the booster are incorporated in a case.
[0017]
In the internal combustion engine ignition device unit according to the first aspect, the control circuit unit starts the control operation in a low speed rotation range of the internal combustion engine, and starts the control operation in a high speed rotation range of the internal combustion engine. The second control circuit unit is configured by separate components independent for each unit. The first control circuit unit and the second control circuit unit are housed in a circuit unit housing chamber in the case.
[0018]
As described above, when the control circuit unit is configured separately from the first control circuit unit and the second control circuit unit, even if the control circuit is of a simple waveform advance type, the first control circuit unit and the second control circuit unit can be used. By sharing the advance angle width with the unit, a required wide advance angle width can be obtained.
[0019]
In addition, if the first control circuit unit and the second control circuit unit are configured as separate and independent components for each unit, only the first control circuit unit is used without using the second control circuit unit. Is used to configure the internal combustion engine ignition device unit, that is, the case where the advance width of the ignition timing may be relatively narrow, and the case where the advance width of the ignition timing is required to be wide as in the present invention. The structure inside the case excluding the circuit unit can be shared, and thus the cost can be reduced by sharing the components.
[0020]
An internal combustion engine ignition device unit to be improved by the invention according to claim 2 is:
During one revolution of the internal combustion engine, an AC voltage consisting of at least a half-cycle voltage of one polarity, a voltage of a half-cycle of the other polarity, and a voltage of a half-cycle of one polarity is applied to a half-cycle voltage of one polarity. An ignition power supply coil for inducing the peak value of the half-cycle voltage of the other polarity to be greater than the peak value of
A main switching element that conducts when an AC voltage induced by the ignition power supply coil is generated and substantially short-circuits the ignition power supply coil; and a voltage at both ends of the ignition power supply coil when the main switching element is conducting is a predetermined level. A control circuit for performing a control operation of turning off the main switching element when the control circuit reaches the control circuit unit, and a control circuit unit that unitizes a control circuit that induces a high voltage in the ignition power supply coil by cutting off the main switching element,
Boosting means for generating an ignition high voltage by boosting an AC voltage induced in the ignition power supply coil when the main switching element is turned off,
It has a structure in which at least the control circuit unit and the booster are incorporated in a case.
[0021]
In the internal combustion engine ignition device unit according to claim 2, the control circuit unit has a power generation characteristic in which a half-cycle voltage of one polarity does not exceed the set level and a half-cycle voltage of the other polarity exceeds the set level. A first control circuit unit for operating the control element by a voltage of a half cycle of the other polarity to cut off the main switching element at least in a low speed rotation range of the internal combustion engine; In the high-speed rotation range of the internal combustion engine, in which both the voltage of the polarity half cycle exceeds the set level, the control element operates by each voltage of the polarity half cycle to cut off the main switching element, respectively. The control circuit unit is constituted by separate components independent for each unit. The first control circuit unit and the second control circuit unit are housed in a circuit unit housing chamber in the case.
[0022]
As described above, when the control circuit unit is configured separately from the first control circuit unit and the second control circuit unit, the control circuit of the simple waveform advancing type also has the first control circuit unit. By sharing the advance angle width between the control circuit unit and the second control circuit unit, a required wide advance angle width can be obtained.
[0023]
Further, when the first control circuit unit and the second control circuit unit are configured by separate components independent for each unit, the second control circuit unit can be used without using the second control circuit unit. When the internal combustion engine ignition device unit is configured using only the first control circuit unit, that is, when the advance width of the ignition timing may be relatively narrow, and when the advance width of the ignition timing is reduced as in the present invention. When it is required widely, the structure in the case excluding the control circuit unit can be shared, and thus the cost can be reduced by sharing the components.
[0024]
In particular, according to the present invention, the second control circuit unit and the second control circuit unit in the high-speed rotation range of the internal combustion engine both exhibit a power generation characteristic in which the voltage of the half cycle of one polarity and the voltage of the half cycle of the other polarity exceed the set level. Since each main switching element with the first control circuit unit performs a shut-off operation, ignition can be repeated three or more times, and an ignition mistake can be avoided even in a high-speed rotation region.
[0025]
An internal combustion engine ignition device unit to be improved by the invention according to claim 3 is:
During one revolution of the internal combustion engine, an AC voltage consisting of at least a half-cycle voltage of one polarity, a voltage of a half-cycle of the other polarity, and a voltage of a half-cycle of one polarity is applied to a half-cycle voltage of one polarity. An ignition power supply coil for inducing the peak value of the half-cycle voltage of the other polarity to be greater than the peak value of
A main switching element that conducts when an AC voltage induced by the ignition power supply coil is generated and substantially short-circuits the ignition power supply coil; and a voltage at both ends of the ignition power supply coil when the main switching element is conducting is a predetermined level. And a control element for performing a control operation of turning off the main switching element when the voltage reaches the peak value or the peak value, and a control circuit for inducing a high voltage in the ignition power supply coil by shutting off the main switching element is unitized. Control circuit unit,
Boosting means for generating an ignition high voltage by boosting an AC voltage induced in the ignition power supply coil when the main switching element is turned off,
It has a structure in which at least the control circuit unit and the booster are incorporated in a case.
[0026]
In the internal combustion engine ignition device unit according to claim 3, the control circuit unit operates when the voltage of the other polarity half cycle reaches the peak value, and the control element operates to cut off the main switching element. The unit and the voltage of the one polarity half cycle are controlled in the high speed rotation range of the internal combustion engine in which the voltage of the one polarity half cycle and the voltage of the other polarity half cycle both exceed the set level. As a second control circuit unit that operates and shuts off the main switching element, each of the units is configured by a separate component independent for each unit. The first control circuit unit and the second control circuit unit are housed in a circuit unit housing chamber in the case.
[0027]
As described above, when the control circuit unit is configured separately from the first control circuit unit and the second control circuit unit, the control circuit of the simple waveform advancing type also has the first control circuit unit. By sharing the advance angle width between the control circuit unit and the second control circuit unit, a required wide advance angle width can be obtained.
[0028]
Further, when the first control circuit unit and the second control circuit unit are configured by separate components independent for each unit, the second control circuit unit can be used without using the second control circuit unit. When the internal combustion engine ignition device unit is configured using only the first control circuit unit, that is, when the advance width of the ignition timing may be relatively narrow, and when the advance width of the ignition timing is reduced as in the present invention. When it is required widely, the structure in the case excluding the control circuit unit can be shared, and thus the cost can be reduced by sharing the components.
[0029]
In particular, according to the present invention, since the main switching elements of the second control circuit unit and the first control circuit unit perform the shut-off operation in the high-speed rotation range of the internal combustion engine, ignition is repeated three times or more. As a result, it is possible to avoid ignition errors even in a high-speed rotation range.
[0030]
In the internal combustion engine ignition device unit according to claim 4, in claim 1, 2, or 3, the circuit unit housing chamber is partitioned by a partition, and the first control circuit unit is partitioned by the partition into each room. The second control circuit unit and the second control circuit unit are separately housed. In this case, the partition wall may be provided integrally with the case, or may be separately inserted from the case and later inserted into the circuit unit housing chamber.
[0031]
When the first control circuit unit and the second control circuit unit are separately housed in each room partitioned by the partition walls, the withstand voltage characteristics of the first control circuit unit and the second control circuit unit And noise resistance can be improved.
[0032]
In the present invention, the low-speed rotation range and the high-speed rotation range of the internal combustion engine are referred to as a low-speed rotation range in which the ignition timing of the internal combustion engine is lower than the rotation speed at which the step advance is performed. The rotation range with a high rotation speed is called a high-speed rotation range.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
1A and 1B show a first example of an embodiment of an internal combustion engine ignition device unit according to the present invention, wherein FIG. 1A is a front view of the internal combustion engine ignition device unit, and FIG. It is a partially broken side view of (A). FIG. 2 is a circuit diagram showing a configuration of two control circuit units and an ignition coil used in the present embodiment. 3A, 3B and 4A and 4B are waveform diagrams showing the operation of the control circuit unit shown in FIG. FIG. 5 is a configuration diagram showing the relationship between the internal combustion engine ignition device unit and the magnet generator according to the present invention. Parts corresponding to those in FIGS. 10A and 10B and FIG. 11 are denoted by the same reference numerals.
[0034]
The iron core 6 of the ignition coil 3 has a U-shape as shown in FIG. 5, and both ends 6 a and 6 b are opposed to the outer periphery of the flywheel 24 of the rotor 23 of the magnet generator 22 with a gap therebetween. Has become. The flywheel 24 is fixed to a crankshaft 25 of the internal combustion engine. A recess 26 is provided in a part of the outer periphery of the flywheel 24. A permanent magnet 27 magnetized in the radial direction of the flywheel 24 is fixed to a central bottom portion of the concave portion 26. A pole piece 27a is fixed to the outer pole surface of the permanent magnet 27. In the illustrated example, the permanent magnet 27 is magnetized so that the outer magnetic pole becomes the N pole, and the S pole appears on both sides of the concave portion 26 when viewed in the circumferential direction of the flywheel 24 and appears. . Therefore, a total of three magnetic poles S, N, S are formed. Due to such a structure, each time both ends 6a, 6b of the iron core 6 face these magnetic poles S, N, S, the ignition power supply coil 2 (that is, the primary coil 3a) is moved to the state shown in FIG. As shown in A), a half-cycle voltage Vp1 of one polarity (positive in this example), a half-cycle voltage Vn of the other polarity (negative), and one polarity (positive in this example) The half-cycle voltage Vp2 is induced continuously and in such a manner that the peak value of the half-cycle voltage Vn of the other polarity is larger than the peak values of the two half-cycle voltages Vp1 and Vp2 of one polarity. Become.
[0035]
In the internal combustion engine ignition device unit 1 of the present embodiment, the main switching elements 9A and 9B, which are NPN transistors that conduct when an AC voltage induced by the ignition power supply coil 2 is generated and substantially short-circuit the ignition power supply coil 2, and the main switching elements 9A and 9B. A control element composed of an NPN transistor that performs a control operation of turning off the main switching elements 9A and 9B when the voltage across the ignition power supply coil 2 reaches a predetermined level when the main switching elements 9A and 9B are conducting. 10A and 10B, and a control circuit unit 13 formed by unitizing a control circuit 8 that induces a high voltage in the ignition power supply coil 2 by shutting off the main switching elements 9A and 9B.
[0036]
As shown in FIGS. 2 and 3A, the control circuit unit 13 does not allow the voltages Vp1 and Vp2 of two half cycles of one polarity (positive in this example) to exceed the set level L1 and the other polarity ( In this example, the voltage Vn of the negative half cycle exceeds the set level L2. At least in the low speed rotation range of the internal combustion engine exhibiting the power generation characteristic, the voltage Vn of the other polarity (negative in this example) is used by the NPN transistor. A first control circuit unit 13A in which the control element 10A is turned on to shut off the main switching element 9A formed of an NPN transistor, the voltages Vp1 and Vp2 of one polarity (positive in this example) of a half cycle and the other polarity. One polarity (positive in this example) in the high-speed rotation range of the internal combustion engine in which the voltage Vn of the half cycle (negative in this example) exceeds the set levels L1 and L2. The control element 10B made of an NPN transistor is turned on by each of the voltages Vp1 and Vp2 in the half cycle of (2), and a second control circuit unit 13B that cuts off the main switching element 9B made of an NPN transistor. It is composed of parts.
[0037]
The first control circuit unit 13A and the second control circuit unit 13B are composed of the same circuit elements as the control circuit unit 13 shown in FIG. 11, and in order to clarify the correspondence, The same reference numerals as those of the components of the control circuit unit 13 shown in FIG. 11 indicate that units A, B, a, and b are added to mean the units 13A and 13B.
[0038]
In the control circuit 8A of the first control circuit unit 13A, each emitter side of the main switching element 9A composed of an NPN transistor and the control element 10A composed of an NPN transistor is connected to one end of the ignition power supply coil 2 (that is, the primary coil 3a). The collector is connected to a lead wire 14A, and the collector side is connected to a lead wire 15A for grounding. In the control circuit 8B of the second control circuit unit 13B, each collector side of the main switching element 9B composed of an NPN transistor and the control element 10B composed of an NPN transistor is connected to one end of the ignition power supply coil 2 (that is, the primary coil 3a). And the emitter side is connected to a ground lead 15B. Further, the first control circuit unit 13A and the second control circuit unit 13B are connected to the lead wires 14A, 14B connected to one end of the ignition power supply coil 2 (that is, the primary coil 3a) in the direction shown in the drawing. 28A and 28B are connected. That is, the diode 28A is connected to one end of the ignition power supply coil 2 (that is, the primary coil 3a) with its cathode facing, and the diode 28B is directed to its anode.
[0039]
As shown in FIGS. 1A and 1B, the circuit unit housing chamber 21 provided in the case 20 is partitioned by a partition wall 20a to form two rooms 21A and 21B. The partition 20a and the rooms 21A and 21B are formed together when the case 20 is formed.
[0040]
The first control circuit unit 13A and the second control circuit unit 13B described above are separately housed in the rooms 21A and 21B in the case 20.
[0041]
The case 20 is filled with an insulating resin (not shown) including the rooms 21A and 21B accommodating the first control circuit unit 13A and the second control circuit unit 13B.
[0042]
Next, the operation of advancing the ignition timing according to the rotation speed of the internal combustion engine using the first control circuit unit 13A and the second control circuit unit 13B will be described with reference to FIG. B) and FIGS. 4 (A) and 4 (B).
[0043]
In the low-speed rotation range of the internal combustion engine, an AC voltage as shown in FIG. 3A is periodically generated from the ignition power supply coil 2 (that is, the primary coil 3a of the ignition coil 3). The AC voltage of this example includes a half-cycle voltage Vp1 of one polarity (positive in this example), a half-cycle voltage Vn of the other polarity (negative), and one polarity (positive in this example). And the voltage Vp2 of the half cycle of the other polarity is continuously induced so that the peak value of the voltage Vn of the half cycle of the other polarity is larger than the peak value of the voltages Vp1 and Vp2 of the two half cycles of one polarity. .
[0044]
As shown in FIG. 3A, such an AC voltage in the low-speed rotation region is such that the voltages Vp1 and Vp2 of two half cycles of one polarity (positive in this example) do not exceed the set level L1 and the other half. The voltage Vn of the half cycle of the polarity (negative in this example) has a power generation characteristic exceeding the set level L2.
[0045]
As shown in FIG. 3A, the first control circuit unit 13A to which the AC voltage having such a power generation characteristic is applied has two half-cycle voltages Vp1 and Vp2 of one polarity (positive in this example). The voltage Vn of a half cycle of the other polarity (negative in this example) that does not exceed the level L1 and has a power generation characteristic exceeding the set level L2 in a low speed rotation range of the internal combustion engine, and the other polarity (negative in this example). The main switching element 9A composed of an NPN transistor of the first control circuit unit 13A shown in FIG. That is, the main switching element 9A is turned on by the current flowing from the lead wire 15A side to the collector.
[0046]
When the main switching element 9A conducts, a closed circuit is formed passing through the main switching element 9A and the ignition power supply coil 2. When the voltage across the ignition power supply coil 2 reaches a predetermined level L2, a trigger signal supply circuit is provided. A trigger signal is supplied from 11A to the base of a control element 10A composed of an NPN transistor, the control element 10A conducts, and the main switching element 9A is turned off. Due to the interruption of the main switching element 9, as shown in FIG. 3B, a high voltage Vhn is induced in the secondary coil 3b at the rotation angle θ1 of the internal combustion engine. This high voltage Vhn is applied to the spark plug 4 to ignite the internal combustion engine. In FIG. 3, TDC indicates the top dead center of the internal combustion engine.
[0047]
As shown in FIG. 4A, the rotation speed of the internal combustion engine increases, and as shown in FIG. 4A, half-cycle voltages Vp1 and Vp2 of one polarity (positive in this example) and half-cycle voltages of the other polarity (negative) in this example. In the high-speed rotation range of the internal combustion engine, in which Vn both exceeds the set levels L1 and L2, the second control shown in FIG. 2 is performed by the voltages Vp1 and Vp2 of one polarity (positive in this example) in half cycles. The main switching elements 9B made of NPN transistors of the circuit unit 13B are turned on, respectively, and are made of the NPN transistors of the first control circuit unit 13A shown in FIG. 2 by the half-cycle voltage Vn of the other polarity (in this example, negative). The main switching element 9A becomes conductive.
[0048]
When the main switching element 9B is turned on by the half-cycle voltage Vp1 of one polarity (positive in this example), a closed circuit passing through the main switching element 9B and the ignition power supply coil 2 is formed. When the voltage Vp1 at both ends reaches a predetermined level L1, a trigger signal is supplied from the trigger signal supply circuit 11B to the base of the control element 10B composed of an NPN transistor, the control element 10B conducts, and the main switching element 9B is cut off. To By the interruption of the main switching element 9B, a high voltage Vhp1 is induced in the secondary coil 3b at the rotation angle θ2 of the internal combustion engine as shown in FIG. 4B. This high voltage Vhp1 is applied to the spark plug 4, and the first ignition operation is performed on the internal combustion engine.
[0049]
Next, as shown in FIG. 4A, when the main switching element 9A conducts at a voltage Vn of a half cycle of the other polarity (negative in this example), the closing through the main switching element 9A and the ignition power supply coil 2 is performed. When a voltage Vn across the ignition power supply coil 2 reaches a predetermined level L2, a trigger signal is supplied from a trigger signal supply circuit 11A to the base of a control element 10A comprising an NPN transistor. 10A conducts, and turns off the main switching element 9A. By shutting off the main switching element 9A, a high voltage Vhn is induced in the secondary coil 3b at the rotation angle θ1 of the internal combustion engine as shown in FIG. 4B. This high voltage Vhn is applied to the spark plug 4, and a second ignition operation is performed on the internal combustion engine.
[0050]
Further, as shown in FIG. 4A, when the main switching element 9B is turned on by a half-cycle voltage Vp2 of one polarity (positive in this example), the closed circuit passing through the main switching element 9B and the ignition power supply coil 2 is closed. Then, when the voltage Vp2 across the ignition power supply coil 2 reaches a predetermined level L1, a trigger signal is supplied from the trigger signal supply circuit 11B to the base of the control element 10B composed of an NPN transistor, and the control element 10B Is conducted, and the main switching element 9B is turned off. Due to the interruption of the main switching element 9B, a high voltage Vhp2 is induced in the secondary coil 3b at the rotation angle θ3 of the internal combustion engine as shown in FIG. 4B. This high voltage Vhp2 is applied to the spark plug 4, and the third ignition operation is performed on the internal combustion engine.
[0051]
As described above, according to the present embodiment, the ignition timing of the internal combustion engine is performed at the rotation angle θ1 in the low speed rotation range, but the ignition timing of the internal combustion engine is advanced from the rotation angle θ1 in the high speed rotation range. It is performed at θ2, and the advance angle width is widened, so that an advance angle width of 20 ° or more can be easily obtained.
[0052]
Further, ignition can be repeated three times in the high-speed rotation range of the internal combustion engine, and ignition mistakes can be avoided even in the high-speed rotation range.
[0053]
In this example, the rotation speed of the internal combustion engine when the voltage Vp1 of a half cycle of one polarity (positive in this example) exceeds the set level L1 is determined by the step in which the ignition timing of the internal combustion engine is advanced in a stepwise manner. The rotation range of the rotation speed lower than the rotation speed of the step advance is the low speed rotation range, and the rotation range of the rotation speed higher than the rotation speed of the step advance is the high speed rotation range.
[0054]
FIG. 6 is a circuit diagram showing a configuration of two control circuit units and an ignition coil in a second example of the embodiment of the internal combustion engine ignition device unit according to the present invention.
[0055]
In this second example, the main switching elements 9A, 9B and the main switching elements 9A, 9B, which are NPN transistors that conduct when an AC voltage induced by the ignition power supply coil 2 is generated and substantially short-circuit the ignition power supply coil 2, are provided. When the voltage across the ignition power supply coil 2 reaches a predetermined level or reaches a peak value when the conduction of 9B is conducted, the main switching elements 9A and 9B are controlled by an NPN transistor to perform a cutoff state. A control circuit unit 13 including control elements 10A and 10B and a control circuit 8 for inducing a high voltage in the ignition power supply coil 2 by shutting off the main switching elements 9A and 9B is provided.
[0056]
When the voltage Vn of the half cycle of the other polarity (negative in this example) reaches the peak value, the control circuit unit 13 operates the control element 10A composed of an NPN transistor to cut off the main switching element 9A. The control circuit unit 13A ', the voltages Vp1 and Vp2 of one polarity (positive in this example) of half cycle and the voltages Vn of the other polarity (negative) in half cycle both exceed the set levels L1 and L2. A second control circuit unit which operates in the high speed rotation range of the internal combustion engine exhibiting the power generation characteristic by the voltages Vp1 and Vp2 of the one polarity half cycle, and the control element 10B composed of an NPN transistor operates to cut off the main switching element 9B. 13B is constituted by separate parts independent for each unit.
[0057]
That is, in the second example, when the configuration of the control circuit unit 13 is compared with the first example, the structure of the second control circuit unit 13B is the same, but the structure of the first control circuit unit 13A 'is different. I have.
[0058]
The control circuit 8A 'of the first control circuit unit 13A' includes a main switching element 9A composed of an NPN transistor, a control element 10A composed of an NPN transistor, a PNP transistor TRa1, NPN transistors TRa2 and TRa3, and resistors Ra1 and Ra2. , Ra5 to Ra7, a capacitor Ca1, and diodes 29A, Da1, Da2.
[0059]
The main switching element 9A composed of an NPN transistor has an emitter connected to a lead 14A connected to one end of the ignition power supply coil 2 (that is, the primary coil 3a), and a collector connected to a ground lead 15A. The control element 10A composed of an NPN transistor has its emitter connected to the lead 14A and its collector connected to the ground lead 15A via the resistor Ra2. The base of the main switching element 9A is connected to a connection point between the resistor Ra2 and the collector of the control element 10A via a resistor Ra1. The PNP transistor TRa1 has a collector connected to the base of the control element 10A, a base connected to the collector of the control element 10A via the resistor Ra5, and an emitter connected to the lead wire 15A via the resistor Ra6. A connection point between the collector of the transistor TRa1 and the collector of the control element 10A is connected to the lead wire 14A via the diode Da1. The anode of the diode Da1 is connected to the lead wire 14A. The NPN transistor TRa2 has a collector connected to the base of the control element 10A and a base connected to the lead 15A via the resistor Ra8. The NPN transistor TRa3 has a collector connected to the emitter of the transistor TRa2 via the resistor Ra9, an emitter connected to the lead 14A, and a base connected to the lead 14A via the diode Da2. The anode of the diode Da2 is connected to the lead wire 14A. A series circuit of a resistor Ra7 and a capacitor Ca1 is connected between a connection point between the emitter of the transistor TRa1 and the resistor Ra6 and the base of the transistor TRa3. The lead wire 14A is connected to one end of the ignition power supply coil 2 (that is, the primary coil 3a) via the diode 29A as in the case of FIG.
[0060]
In this example, the transistors TRa1, TRa2, TRa3, Ra5 to Ra7, the capacitor Ca1, the diodes Da1, Da2, and the capacitor Ca1 supply a trigger signal supply circuit 11A 'for supplying a trigger signal to the control element 10A composed of a transistor. Is configured.
[0061]
Also in the internal combustion engine ignition device unit of this example, the first control circuit unit 13A 'and the second control circuit unit 13B are not shown in this example, but are not shown in FIGS. 1A and 1B described above. As in the case of the example, the first control circuit unit 13A and the second control circuit unit 13B are separately housed in the respective rooms 21A and 21B of the circuit unit housing chamber 21 in the case 20. Is filled with the insulating resin including the rooms 21A and 21B accommodating.
[0062]
Next, the operation of the first control circuit unit 13A 'in the internal combustion engine ignition device unit shown in FIG. 6 will be described.
[0063]
In the first control circuit unit 13A ', when the ignition power supply coil 2 generates a half-cycle voltage Vn of the other polarity (in this example, negative), the resistors Ra6 and Ra7 and the capacitor A charging current of the capacitor Ca1 flows between Ca1 and the base-emitter of the transistor TRa3, and a predetermined base current is supplied to the transistor TRa3 while the charging current is flowing, so that the transistor TRa3 conducts. While the transistor TRa3 is conducting (while the charging current of the capacitor Ca1 is flowing), almost all the current flowing from the ignition power supply coil 2 through the resistor Ra8 is connected to the PN junction between the base and the emitter of the transistor TRa2, the resistor Ra9, and the transistor TRa3. Therefore, no base current is applied to the control element 10A composed of an NPN transistor from the ignition power supply coil 2 through the resistor Ra8 and the PN junction between the base and collector of the transistor TRa2. In addition, when the ignition power supply coil 2 generates the voltage Vn of the other polarity (negative in this example) of a half cycle, a sufficient base current does not flow through the transistor TRa1, so that the transistor TRa1 is also in the cut-off state, and the transistor TRa1 side No base current is supplied to the control element 10A. As described above, since the control element 10A is initially in the cut-off state when the ignition power supply coil 2 generates the voltage Vn of the negative half cycle, the base current is supplied from the ignition power supply coil 2 to the main switching element 9A through the resistors Ra2 and Ra1. As a result, the main switching element 9A conducts, and a short-circuit current flows from the ignition power supply coil 2 through the main switching element 9A.
[0064]
When the short-circuit current flowing through the ignition power supply coil 2 reaches a peak and the voltage across the ignition power supply coil 2 (the voltage between the collector and the emitter of the main switching element 9A) reaches the peak, the charging of the capacitor Ca1 is stopped. The base current stops flowing, and the transistor TRa3 is turned off. When the transistor TRa3 is turned off, a base current flows from the ignition power supply coil 2 to the control element 10A through the resistor Ra8 and the PN junction between the base and the collector of the transistor TRa2, so that the control element 10A conducts. When the voltage at both ends of the ignition power supply coil 2 reaches a predetermined level, a base current flows from the ignition power supply coil 2 to the transistor TRa1 through the resistor Ra6 and the transistor TRa1 conducts, so that the base current flows to the control element 10A through the transistor TRa1. Flows.
[0065]
That is, in the first control circuit unit 13A ', when the voltage across the ignition power supply coil 2 reaches a peak, or when the voltage across the ignition power supply coil 2 reaches a predetermined value and the transistor TRa1 is turned on. The control element 10A conducts. When the control element 10A conducts, the base current of the main switching element 9A is bypassed from the main switching element 9A through the control element 10A, so that the main switching element 9A is turned off. As a result, the current flowing through the ignition power supply coil 2 is cut off, and a high ignition voltage is induced in the secondary coil 3b of the ignition coil 3. Therefore, when the voltage Vn of the other polarity (negative in this example) of a half cycle is induced in the ignition power supply coil 2, the position where the voltage across the ignition power supply coil 2 reaches a peak or the voltage across the ignition power supply coil 2 Is a predetermined value (a value at which the transistor TRa1 is turned on).
[0066]
In the first control circuit unit 13A 'shown in FIG. 6, when the rotation speed of the internal combustion engine is lower than the set cutoff value switching speed, the transistor TRa1 is kept in the cutoff state, and the rotation speed becomes the cutoff value switching speed. , When a voltage at both ends of the ignition power supply coil 2 reaches a peak, a predetermined base current flows through the transistor TRa1 so that the transistor TRa1 conducts. The resistance value of Ra1 is set.
[0067]
Therefore, when the rotation speed of the engine is lower than the cutoff value switching speed, when the voltage across the ignition power supply coil 2 that induces the half-cycle voltage Vn of the other polarity (negative in this example) reaches a peak. When the rotation speed of the engine exceeds the cutoff value switching speed, the voltage at both ends of the ignition power supply coil 2 becomes higher than the position at which the voltage at both ends of the ignition power supply coil 2 reaches a peak. The ignition operation is performed when the value of.
[0068]
For the internal combustion engine ignition device unit shown in FIG. 6, the no-load output voltage waveform of the ignition power supply coil 2 and the output voltage waveform of the secondary coil 3b of the ignition coil 3 when the rotation speed of the engine is equal to or less than the set value are shown in FIG. (A) and (B). 8 (A) and 8 (B) show a no-load output voltage waveform of the ignition power supply coil 2 and an output voltage waveform of the secondary coil 3b of the ignition coil 3 when the rotation speed of the engine exceeds the set value, respectively. FIG. 9 shows a no-load output voltage waveform of the ignition power supply coil 2 and an output voltage waveform of the secondary coil 3b of the ignition coil 3 when the rotation speed of the engine exceeds a cutoff value switching speed higher than the set value. (A) and (B). In FIG. 9B, θ1 ′ indicates a position advanced from θ1.
[0069]
In the above example, an example is shown in which the secondary coil 3b of the ignition coil 3 is also used as the ignition power supply coil 2. However, the ignition power supply coil 2 is separate from the ignition coil 3 and is connected to the magnet generator outside the case 20. It may be incorporated.
[0070]
Further, in the above example, as shown in FIG. 3A, the AC output voltage of the ignition power supply coil 2 is such that the half-cycle voltage peak value of one polarity (positive in this example) has the other polarity (negative in this example). Although the example in which the peak value of the half cycle voltage is smaller than the peak value of the half cycle voltage is shown, the present invention is not limited to this, and the peak value of the half cycle voltage of both polarities may be the same. In this case, in the low-speed rotation range, the set level L1 is set to a level exceeding the half-cycle voltage peak value of one polarity, and the set level L2 is set to the half-cycle voltage peak value of the other polarity. The level may be set so as not to exceed. In the high-speed rotation region, the peak values of the voltages of both polarities both increase, and the peak value of the voltage of one polarity half cycle also exceeds the set level L1.
[0071]
Further, the AC output voltage of the ignition power supply coil 2 is not limited to a voltage consisting of three half cycles as shown in FIG. 3A, and is at least one cycle during one rotation of the internal combustion engine. Any waveform that induces an AC voltage may be used.
[0072]
【The invention's effect】
In the internal combustion engine ignition device unit according to the present invention, the control circuit unit includes a first control circuit unit that starts a control operation in a low speed rotation range of the internal combustion engine, and a second control circuit unit that starts a control operation in a high speed rotation range of the internal combustion engine. Since the control circuit unit is configured separately from the control circuit unit of the first embodiment, even in a control circuit of a simple waveform advance system, the first control circuit unit and the second control circuit unit share the advance angle width, so that a wide required range is provided. The advance angle width can be obtained. Further, since the first control circuit unit and the second control circuit unit are configured by separate components independent for each unit, only the first control circuit unit is used without using the second control circuit unit. The case where the advance width of the ignition timing may be relatively narrow as in the case of configuring the internal combustion engine ignition device unit using the case, and the case where the advance angle width of the ignition timing is required to be wide as in the present invention, The structure in the case excluding the control circuit unit can be shared, and thus the cost can be reduced by sharing the components.
[Brief description of the drawings]
FIG. 1 shows a first example of an embodiment of an internal combustion engine ignition device unit according to the present invention, wherein (A) is a front view of the internal combustion engine ignition device unit, and (B) is one of (A). It is a fragmentary side view.
FIG. 2 is a circuit diagram showing a configuration of two control circuit units and an ignition coil used in this example.
FIGS. 3A and 3B are waveform diagrams showing the operation of the control circuit unit shown in FIG. 2;
FIGS. 4A and 4B are waveform diagrams showing the operation of the control circuit unit shown in FIG. 2;
FIG. 5 is a configuration diagram showing a relationship between an internal combustion engine ignition device unit of the present example and a magnet generator.
FIG. 6 is a circuit diagram showing a configuration of two control circuit units and an ignition coil used in a second example of the embodiment of the internal combustion engine ignition device unit according to the present invention.
FIGS. 7A and 7B are waveform diagrams showing the operation of the control circuit unit shown in FIG. 6;
FIGS. 8A and 8B are waveform diagrams showing the operation of the control circuit unit shown in FIG. 6;
FIGS. 9A and 9B are waveform diagrams showing the operation of the control circuit unit shown in FIG. 6;
10A and 10B show the configuration of a conventional internal combustion engine ignition device unit, wherein FIG. 10A is a front view of the internal combustion engine ignition device unit, and FIG. 10B is a partially cutaway side view of FIG.
FIG. 11 is a circuit diagram showing a configuration of a conventional control circuit unit and an ignition coil.
[Explanation of symbols]
1 Internal combustion engine ignition unit
2 Ignition power supply coil
3 Ignition coil
3a Primary coil
3b Secondary coil
4 Spark plug
5 bobbins
6 Iron core
7 Iron core insertion hole
8, 8A, 8A ', 8B control circuit
9,9A, 9B Main switching element
10, 10A, 10B control element
11, 11A, 11A ', 11B Trigger signal supply circuit
12 resin
13 Control circuit unit
13A, 13A 'First control circuit unit
13B Second control circuit unit
14, 14A, 14B Lead wire
15, 15A, 15B Lead wire
16 Primary Terminal
17 earth terminal
18 High voltage terminal
19 High-pressure cord holding cylinder
20 cases
20a partition
21 Unit accommodation room
21A, 21B room
22 Magnet generator
23 rotor
24 Flywheel
25 crankshaft
26 recess
27 permanent magnet
27a Magnetic pole piece
28A, 28B Diode
TRa1, TRa2, TRa2 transistor
Ra1 to TRa9 resistance
Da1, Da2 diode
Ca1 capacitor

Claims (4)

An ignition power coil for inducing at least one cycle of an AC voltage during one revolution of the internal combustion engine;
A main switching element that conducts when an AC voltage induced by the ignition power supply coil is generated and substantially short-circuits the ignition power supply coil, and a voltage at both ends of the ignition power supply coil when the main switching element is conducting. And a control element for performing a control operation of turning off the main switching element when a predetermined level or a peak value is reached, and a high voltage is induced in the ignition power supply coil by shutting off the main switching element. A control circuit unit obtained by unitizing a control circuit to be
Boosting means for boosting the AC voltage induced in the ignition power supply coil when the main switching element is turned off to generate a high ignition voltage,
An internal combustion engine ignition device unit in which at least the control circuit unit and the booster are incorporated in a case,
The control circuit unit includes a first control circuit unit that starts a control operation in a low-speed rotation range of the internal combustion engine, and a second control circuit unit that starts a control operation in a high-speed rotation range of the internal combustion engine. It is composed of independent separate parts,
The internal combustion engine ignition device unit, wherein the first control circuit unit and the second control circuit unit are housed in a circuit unit housing chamber in the case. During one revolution of the internal combustion engine, an AC voltage consisting of at least one half cycle voltage of one polarity, half cycle voltage of the other polarity, and again half cycle voltage of one polarity is applied to the half cycle of the one polarity. An ignition power supply coil for inducing the peak value of the voltage of the other polarity half cycle to be greater than the peak value of the voltage,
A main switching element that conducts when an AC voltage induced by the ignition power supply coil is generated and substantially short-circuits the ignition power supply coil, and a voltage at both ends of the ignition power supply coil when the main switching element is conducting. A control element for performing a control operation of turning off the main switching element when a predetermined level is reached, and unitizing a control circuit for inducing a high voltage in the ignition power supply coil by shutting off the main switching element. Control circuit unit,
Boosting means for boosting the AC voltage induced in the ignition power supply coil when the main switching element is turned off to generate a high ignition voltage,
An internal combustion engine ignition device unit in which at least the control circuit unit and the booster are incorporated in a case,
In the control circuit unit, at least in the low-speed rotation range of the internal combustion engine, the half-cycle voltage of the one polarity does not exceed the set level, and the half-cycle voltage of the other polarity has a power generation characteristic exceeding the set level. A first control circuit unit for operating the control element by the half-polarity voltage of the other polarity to cut off the main switching element; and a half-cycle voltage of the one polarity and a half-cycle of the other polarity. A second control in which the control element is operated by each voltage of the one-polarity half cycle to cut off the main switching element in a high-speed rotation range of the internal combustion engine in which both voltages exceed a set level. As a circuit unit, each unit is composed of independent parts,
The internal combustion engine ignition device unit, wherein the first control circuit unit and the second control circuit unit are housed in a circuit unit housing chamber in the case. During one revolution of the internal combustion engine, an AC voltage consisting of at least one half cycle voltage of one polarity, half cycle voltage of the other polarity, and again half cycle voltage of one polarity is applied to the half cycle of the one polarity. An ignition power supply coil for inducing the peak value of the voltage of the other polarity half cycle to be greater than the peak value of the voltage,
A main switching element that conducts when an AC voltage induced by the ignition power supply coil is generated and substantially short-circuits the ignition power supply coil, and a voltage at both ends of the ignition power supply coil when the main switching element is conducting. And a control element for performing a control operation of turning off the main switching element when a predetermined level or a peak value is reached, and a high voltage is induced in the ignition power supply coil by shutting off the main switching element. A control circuit unit obtained by unitizing a control circuit to be
Boosting means for boosting the AC voltage induced in the ignition power supply coil when the main switching element is turned off to generate a high ignition voltage,
An internal combustion engine ignition device unit in which at least the control circuit unit and the booster are incorporated in a case,
The control circuit unit includes a first control circuit unit that operates when the voltage of the other polarity half cycle reaches a peak value and shuts off the main switching element, and a half of the one polarity. The control element is operated by each voltage of the one polarity half cycle in a high speed rotation range of the internal combustion engine, in which both the cycle voltage and the half polarity half cycle voltage exhibit a power generation characteristic exceeding the set level. As a second control circuit unit that shuts off the main switching element, each unit is configured by a separate component independent for each unit,
The internal combustion engine ignition device unit, wherein the first control circuit unit and the second control circuit unit are housed in a circuit unit housing chamber in the case. The circuit unit accommodating room is partitioned by a partition, and the first control circuit unit and the second control circuit unit are separately stored in each room partitioned by the partition. An ignition device unit for an internal combustion engine according to claim 1, 2 or 3.

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