JP2002250262A - Ignition device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ignition device for an internal combustion engine for reducing the number of terminals of the primary coil of an ignition coil. SOLUTION: Since one end of the primary coil 4 of the ignition coil 3 is connected to a collector terminal of a power transistor 1 and the other end is earthed together with the other end of the secondary coil 5, the number of the terminals of the primary coil 4 can be one, and therefore, the number of the terminals of the primary coil 4 is reduced and the structure of wiring, etc., is simplified. Accordingly, there is no need to arrange complicated wiring in the limited space inside an engine room, etc., of a vehicle and a mounting space can be easily secured, so that the repair and maintenance work can be carried out easily. Moreover, the other end of the primary coil 4 can be connected to the core of the ignition coil 3 together with the other end of the secondary coil 5, or to the housing of a spark plug 6. As a result, the ignition device can be easily assembled and the number of assembly processes can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an ignition device for an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, in an ignition device for an internal combustion engine (hereinafter referred to as an "internal combustion engine"), a positive terminal of a battery 10 is connected to a cable 11 as shown in FIG.
0 is connected to one end of the primary coil 140 of the ignition coil 130 via the cable 120.
Is generally connected to the collector of the power transistor 100 via At this time, one end of the secondary coil 150 of the ignition coil 130 is connected to the ignition plug 160, and the other end of the secondary coil 150 is connected to the ground.
The base of the power transistor 100 is connected to an electronic control unit (ECU; not shown).
t), and connected to the power transistor 10
The emitter of 0 is grounded.

[0003]

However, in the engine ignition device in which the ignition coil 130 and the power transistor 100 are formed as separate components as in the prior art, the plus terminal of the battery 10 and the power transistor 1 are connected.
Two terminals respectively connected to the collector of the ignition coil 130 are required for the primary coil 140 of the ignition coil 130. For this reason, the configuration of wiring and the like becomes complicated, and it is necessary to provide complicated wiring inside an engine room or the like of a vehicle with limited space, and it is difficult to secure an installation space, and repair and maintenance work is performed. There was a problem that maintenance was complicated.

The present invention has been made to solve such a problem, and an object of the present invention is to provide an engine ignition device that reduces the number of terminals of a primary coil of an ignition coil. Another object of the present invention is to provide an engine ignition device which has a simple configuration and can easily secure an installation space. Still another object of the present invention is to provide an engine ignition device that is easy to maintain. Still another object of the present invention is to provide an ignition device for an engine that can be easily assembled.

[0005]

According to the ignition device for an engine of the present invention, the number of terminals of the primary coil is one because the primary coil of the ignition coil has one terminal. By doing so, the number of terminals of the primary coil can be reduced. For this reason, the configuration of the wiring and the like is simplified, and there is no need to provide complicated wiring inside an engine room or the like of a vehicle with limited space. Therefore, an installation space can be easily secured, and maintenance such as repair and maintenance work can be simplified.

According to the ignition device for an engine of the present invention, the primary coil of the ignition coil has one end connected to the switching element and the other end connected to the ground. Can be reliably reduced, and the configuration of the wiring and the like can be simplified.

In the engine ignition device according to the third aspect of the present invention, the other end of the primary coil is connected to the core of the ignition coil, so that the ignition coil is attached and the other end of the primary coil is grounded. can do. Therefore, assembling of the device is facilitated, and the number of assembling steps can be reduced.

According to the ignition device for an engine of the present invention, the other end of the primary coil is connected to the housing of the ignition plug, so that the other end of the primary coil is directly connected to the ignition plug. , Easy to assemble the device,
The number of assembling steps can be reduced.

According to the ignition device for an engine according to the fifth aspect of the present invention, the first switching element is turned on / off to charge the capacitor for capacitive discharge with the energy stored in the energy storage coil, and to control the ignition timing. The second switching element is turned on / off, and the energy charged in the capacitor for capacitive discharge is supplied to the primary coil of the ignition coil. Therefore, the energy stored in the capacitor for capacitive discharge and the energy stored in the energy storage coil at the previous ignition timing are supplied to the primary coil of the ignition coil, and a high voltage for ignition is applied to the secondary coil. The spark plug generates a spark.

[0010] Further, the first and second switching elements are alternately turned on and off in a predetermined discharge period thereafter to perform multiple discharges, so that ignition energy is supplied periodically during the discharge period and the spark of the spark plug is maintained. I do.

Further, since the number of terminals of the primary coil of the ignition coil is one, by reducing the number of terminals of the primary coil to one pin, the number of terminals of the primary coil can be reduced. For this reason, the configuration of the wiring and the like is simplified, and there is no need to provide complicated wiring inside an engine room or the like of a vehicle with limited space. Therefore, an installation space can be easily secured, and maintenance such as repair and maintenance work can be simplified.

According to the ignition device for an engine of the present invention, the primary coil of the ignition coil has one end connected to the second switching element and the other end connected to the ground. Can be reliably reduced, and the configuration of the wiring and the like can be simplified.

According to the ignition device for an engine of the present invention, since the other end of the primary coil is connected to the core of the ignition coil, the other end of the primary coil is grounded together with the mounting of the ignition coil. can do. Therefore, assembling of the device is facilitated, and the number of assembling steps can be reduced.

According to the engine ignition device of the present invention, since the other end of the primary coil is connected to the housing of the ignition plug, the other end of the primary coil is directly connected to the ignition plug. , Easy to assemble the device,
The number of assembling steps can be reduced.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; (First Embodiment) FIG. 1 shows an electrical configuration of an engine ignition device according to a first embodiment of the present invention. The ignition device of the first embodiment is mounted on a vehicle, and is a driving type ignition device using a power transistor.

In FIG. 1, an emitter terminal of a power transistor 1 as a switching element is connected to a plus terminal of a battery 10 as a DC power supply, and a collector terminal of the power transistor 1 is connected to one end of a primary coil 4 of an ignition coil 3. It is connected. Further, a base terminal of the power transistor 1 is connected to a collector terminal of the power transistor 2 via a resistor 8. The emitter terminal of the power transistor 2 is grounded.
Are connected to a drive circuit in the ECU (not shown). A resistor 7 is connected between a point P between the plus terminal of the battery 10 and the emitter terminal of the power transistor 1 and a point Q between the base terminal of the power transistor 1 and the resistor 8. One end of the secondary coil 5 of the ignition coil 3 is connected to the ignition plug 6, and the other end is grounded together with the other end of the primary coil 4. The housing of the ignition plug 6 is grounded.

In the first embodiment, the power transistor 2 is turned on / off (conduction /
In this state, the energy of the battery 10 is supplied to the primary coil 4 of the ignition coil 3 via the power transistor 1. As a result, a high voltage is generated on the secondary coil side 5 of the ignition coil 3, and by applying this high voltage to the ignition plug 6, a spark is generated in the ignition plug 6 at a desired ignition timing.

In the first embodiment of the present invention described above, the primary coil 4 of the ignition coil 3 has one end connected to the collector terminal of the power transistor 1 and the other end grounded with the other end of the secondary coil 5. Therefore, the number of terminals of the primary coil 4 can be reduced to one pin. Therefore, the primary coil 4
, The number of terminals is reduced, and the configuration of wiring and the like is simplified. Therefore, there is no need to provide complicated wiring inside an engine room or the like of a vehicle having a limited space, and it is possible to easily secure an installation space and simplify maintenance such as repair and maintenance work.

In the first embodiment, the other end of the primary coil 4 and the other end of the secondary coil 5 can be connected to the core of the ignition coil 3. By doing so, the other ends of the primary coil 4 and the secondary coil 5 can be grounded together with the mounting of the ignition coil 3. Therefore, assembling of the ignition device is facilitated, and the number of assembling steps can be reduced.

Further, in the first embodiment, the other end of the primary coil 4 is connected to the ignition plug 6 together with the other end of the secondary coil 5.
Can be connected to the housing. By directly connecting the other ends of the primary coil 4 and the secondary coil 5 to the ignition plug 6, it is easy to assemble the ignition device, and the number of assembling steps can be reduced.

(Second Embodiment) FIG. 2 shows a second embodiment.
In FIG. 2, an energy storage coil 11 and a transistor Q1 are connected in series between a plus terminal of a battery 10 and a ground. Battery 10 is a 12 volt specification. The energy storage coil 11 has a transistor Q1
The energy is stored by the energization accompanying the turning on of. At this time, the current flowing through the energy storage coil 11 and i _0. The point a between the energy storage coil 11 and the transistor Q1 is connected via a diode D1 to a capacitor 12 as a capacitor for discharging capacity. The capacitor 12 is charged by the energy stored in the energy storage coil 11.

The point b between the diode D1 and the capacitor 12 is connected to the emitter terminal of the transistor Q11, and the collector terminal of the transistor Q11 is connected to the primary coil 14 of the first cylinder ignition coil 13. The emitter terminal of the transistor Q11 and the base terminal of the transistor Q11 are connected via a resistor 27. The base terminal of the transistor Q11 is connected via a resistor 28 to the collector terminal of the transistor Q21. The emitter terminal of the transistor Q21 is grounded, and the base terminal of the transistor Q21 is connected to the drive circuit 22. Then, the transistor Q21 is turned on by the transistor Q21.
It is possible to turn on / off 11 and supply the energy charged in the capacitor 12 to the primary coil 14 of the ignition coil 13. At this time, the current (primary current) flowing through the primary coil 14 is defined as i ₁ . One end of the secondary coil 15 of the ignition coil 13 is connected to a first cylinder spark plug (not shown), and the other end is grounded together with the primary coil 14. A current (secondary current) i ₂ flows through the secondary coil 15 with the energization of the primary coil 14.

Similarly, the aforementioned point b corresponds to the transistor Q12
And the collector terminal of the transistor Q12 is connected to the primary coil 18 of the second cylinder ignition coil 17. An emitter terminal of the transistor Q12,
The base terminal of the transistor Q12 is connected via a resistor 37. The base terminal of the transistor Q12 is
The resistor 38 is connected to the collector terminal of the transistor Q22. The emitter terminal of the transistor Q22 is grounded, and the base terminal of the transistor Q22 is connected to the drive circuit 22. Secondary coil 1 of ignition coil 17
9 has one end connected to a second cylinder spark plug (not shown) and the other end grounded together with the primary coil 18.

Although FIG. 2 shows the ignition coil 17 for the second cylinder, the transistors Q12 and Q22, and the resistors 37 and 38, ignition coils, transistors and resistors for the number of engine cylinders are prepared. ing.

A free-wheeling diode Dfh is connected in parallel with the above-mentioned capacitor 12, so that the transistor Q
When the switch 11 (Q12) is turned off, the current flowing through the primary coil 14 (18) is returned via the diode Dfh.

On the other hand, the ECU 21 can input signals from various sensors to detect the state of the engine (intake air amount, rotation speed, cooling water temperature, etc.). And E
The CU 21 determines an optimal ignition timing according to the engine state at that time. A drive circuit 22 is connected to the ECU 21, and the ECU 21 outputs a cylinder-specific ignition signal IGt and a discharge section signal IGw to the drive circuit 22. The above-mentioned transistors Q1, Q21 and Q22 are connected to the drive circuit 22 as a switching element control means, and the drive signal A is output to the transistor Q1.
1 through the transistor Q21, the first cylinder drive signal B
# 1 is output, and the transistor Q2 is connected to the transistor Q12.
2 to output a second cylinder drive signal B # 2.

As described above, the battery 1 as a DC power supply
0, an energy storage coil 11, and a transistor Q1 as a first switching element, a first series circuit is formed, and a capacitor 1 is connected to the energy storage coil 11 via a diode D1 as backflow prevention means.
2 is further connected, and a capacitor 12 and a transistor Q11 (Q12) as a second switching element
And a primary coil 14 (18) of an ignition coil.
Are formed.

Next, the operation of the ignition device configured as described above will be described with reference to FIG. Discharge section signal IGw
When the cylinder ignition signal IGt, a drive signal A of transistor Q1, and the drive signal B # 1 of transistors Q11, a current i ₀ flows to the energy storage coil 11, the primary current i ₁ of the ignition coil 13, 2 signal waveforms and current waveforms of the next current i ₂ shown in FIG.

The ignition signal IGt for each cylinder is output from the ECU 21 to the drive circuit 22. The signal IGt is output at t1 in FIG.
It is at the H level during the period from to t2. The drive circuit 22 outputs a drive signal A having a waveform synchronized with the signal IGt to the transistor Q1. The signal Q causes the transistor Q
When the transistor 1 is turned on, the current i ₀ gradually increases, and high voltage energy generated in the energy storage coil 11 when the transistor Q1 is turned off is supplied to the primary coil 14 of the ignition coil 13 via the diode D1.

On the other hand, the discharge interval signal IGw is represented by t2 to t2 in FIG.
It is at the H level during the period of t3, and discharge is performed during this period. Specifically, the drive circuit 22 outputs a signal (a signal inverted at the timing of t11, t12,...) Inverted every predetermined time as the drive signal A to the transistor Q1, and outputs the high-voltage energy generated in the energy storage coil 11 when the transistor is turned off. Is stored in the capacitor 12 via the diode D1 (so-called multiple charging). During this repetitive operation, the drive circuit 22 supplies a signal complementary to the drive signal A (a signal inverted at the timing of t2, t11, t12,...) To the transistor Q11 via the transistor Q21 as the drive signal B # 1. Output. The signal B # 1, the energy of the capacitor 12 is supplied to the primary coil 14 of the ignition coil 13, a large second order during interruption of the primary current i ₁ (t11 in FIG. 3, t13, t15, timing t17) A current i ₂ (high voltage) is generated and multiple ignition is performed. Then, for the next ignition, the transistor Q1 is set to t
It turns on at the timing of 17 and turns off at the timing of t18, and the energy generated in the energy storage coil 11 during the period from t17 to t18 is stored in the capacitor 12. That is, the transistor Q11 in the period from t2 to t11 in the operation for the current ignition
Is turned on, the energy accumulated in the capacitor 12 during the period from t17 to t18 (the operation for the previous ignition) and t
The energy generated in the energy storage coil 11 during the period of 1 to t2 is supplied to the primary coil 14 of the ignition coil 13. That is, the capacitor 12 in the primary current i ₁ in the period t2~t11 in FIG 3, a projecting current portion e1
The energy generated in the energy storage coil 11 during the period from t1 to t2 is responsible for the gradual current portion e2 thereafter.

The same operation is performed in other cylinders than the first cylinder. That is, in the drive circuit 22, the cylinder is determined based on the cylinder-specific ignition signal IGt, and the transistor Q1
Drive signal B # 2 for transistor Q12 etc.
Are output, and multiple charging and multiple ignition are performed.

As described above, the drive circuit 22 as the first switching element control means sets the energy storage coil 1 by turning the transistor Q1 on / off (conducting / cutoff).
The capacitor 12 is charged by the energy stored in the transistor 1 (Q11) at the ignition timing.
, Etc.) to an on / off state, and the energy charged in the capacitor 12 is transferred to the primary coil (14) of the ignition coil (13).
Etc.), whereby the ignition operation is performed. More specifically, the drive circuit 22 receives the cylinder-specific ignition signal IGt and the discharge interval signal IGw, and continuously turns on / off the transistor Q1 in a predetermined discharge interval to charge the capacitor 12 multiple times for the target cylinder. At the same time, the transistor (such as Q11) operates complementarily to the transistor Q1 to perform multiple ignition.

In the second embodiment described above, the energy stored in the capacitor 12 and the energy stored in the energy storage coil 11 at the previous ignition timing are the same as the primary coil (14) of the ignition coil (13). ), A high voltage for ignition is applied to the secondary coil (15 etc.), and the spark plug generates a spark.

Further, the transistors (Q1 and Q11, etc.) are alternately turned on and off in a predetermined discharge period thereafter to perform multiple discharges, so that ignition energy is supplied periodically during the discharge period, and the spark of the spark plug is maintained. .

Further, one end of the primary coil (14 etc.) of the ignition coil (13 etc.) is connected to the transistor (Q11 etc.), and the other end is grounded together with the other end of the secondary coil (15 etc.). Therefore, the number of terminals of the primary coil (14 etc.)
Can be a pin. Therefore, the primary coil (14
And the like, the number of terminals is reduced, and the configuration of wiring and the like is simplified. Therefore, there is no need to provide complicated wiring inside an engine room or the like of a vehicle having a limited space, and it is possible to easily secure an installation space and simplify maintenance such as repair and maintenance work.

Also in the second embodiment, the other end of the primary coil (14 etc.) can be connected to the core of the ignition coil (13 etc.) together with the other end of the secondary coil (15 etc.). . By doing so, it is possible to attach the ignition coil (13 or the like) and ground the other ends of the primary coil (14 or the like) and the secondary coil (15 or the like). Therefore, assembling of the ignition device is facilitated, and the number of assembling steps can be reduced.

Further, also in the second embodiment, the other end of the primary coil (14 etc.) can be connected to the housing of the ignition plug together with the other end of the secondary coil (15 etc.). The other end of the primary coil (14 etc.) is connected to the secondary coil (15
Directly connected to the spark plug with the other end of
The ignition device can be easily assembled, and the number of assembling steps can be reduced.

The power transistors 1 and 2 and the transistors Q1, Q11, Q1 in the plurality of embodiments described above.
2, bipolar transistors as Q21 and Q22,
FET (preferably P-channel MOSFET), IGB
Any of T may be used, and any switching element may be used.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram showing an engine ignition device according to a first embodiment of the present invention.

FIG. 2 is an electrical configuration diagram showing an engine ignition device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing signal waveforms and current waveforms of an engine ignition device according to a second embodiment of the present invention.

FIG. 4 is an electrical configuration diagram showing a conventional engine ignition device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Power transistor (switching element) 3, 13, 17 Ignition coil 4, 14, 18 Primary coil 5, 15, 19 Secondary coil 6 Spark plug 10 Battery (DC power supply) 11 Energy storage coil 12 Capacitor (Capacitor for capacity discharge) 21) ECU 22 drive circuit (switching element control means) Q1 transistor (first switching element) Q11, Q12 transistor (second switching element) Q21, Q22 transistor D1 diode (backflow prevention means) IGt cylinder-specific ignition signal IGW discharge Ward signal

Claims (8)

[Claims] An ignition device for an internal combustion engine, comprising: an ignition coil having a primary coil and a secondary coil for applying a voltage to an ignition plug of the internal combustion engine; and a series circuit including a DC power supply and a switching element. The ignition device for an internal combustion engine, wherein the primary coil has one terminal. 2. The ignition device for an internal combustion engine according to claim 1, wherein the primary coil has one end connected to the switching element and the other end connected to ground. 3. The ignition device for an internal combustion engine according to claim 2, wherein the other end of said primary coil is connected to a core of said ignition coil. 4. The ignition device according to claim 2, wherein the other end of the primary coil is connected to a housing of the ignition plug. 5. A first series circuit including a DC power supply, an energy storage coil, and a first switching element; a capacitor for capacitive discharge connected to the energy storage coil via a backflow prevention means; coil,
And a second series circuit including a second switching element, and conducting / cutting off the first switching element to charge the capacitor for discharging capacity with the energy stored in the energy storage coil, Second
And a switching element control means for supplying the energy charged in the capacitor for capacitor discharge to the primary coil by conducting / cutting off the switching element of the first coil, wherein the primary coil has one terminal. An ignition device for an internal combustion engine. 6. The ignition device for an internal combustion engine according to claim 5, wherein one end of the primary coil is connected to the second switching element, and the other end is connected to ground. 7. The ignition device according to claim 6, wherein the other end of the primary coil is connected to a core of the ignition coil. 8. The ignition device according to claim 6, wherein the other end of the primary coil is connected to a housing of the ignition plug.