JP3531535B2 - Ignition device for internal combustion engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational speed of an internal combustion engine.
To prevent overspeed from exceeding the speed limit.
The present invention relates to an ignition device for an internal combustion engine described above. [0002] The load suddenly decreases during operation of an internal combustion engine.
Or no load, the engine speed rises rapidly
Overspeed exceeding the maximum permissible
There is a risk of damage to the installation and the engine. Such dangers
In the event of a risk of slippage, it can be obtained from the ignition system of the engine.
When the rotation speed exceeds the set value based on the rotation speed information
If the ignition timing of the engine is greatly delayed or the engine
Or by controlling auxiliary devices that control the number of turns.
To prevent the rotation speed from rising beyond the set value.
An anti-rotation device is used. For example, Japanese Patent Application Laid-Open No. 2-5743 discloses
In the conventional over-rotation prevention device, there are two units, a first stage and a second stage.
A stable multivibrator is provided,
Constant multivibrator rises primary current of ignition device
Starting from the time point, one cycle when the internal combustion engine is at the set speed is
A delay shorter than the reference time (T1) equal to the time width of the cycle
A preliminary signal (V5) that falls after the delay time (T2)
And the subsequent monostable multivibrator
The reference signal (V1) for a time (T1 -T2) from the time of the start
Is output. This reference signal (V1) and the rise of the primary current
The search signal (V2) obtained from the rise is input to the comparator.
And the comparator outputs a reference signal (V1) and a search signal.
(V2) occurs at the same time when the two signals overlap.
The ignition timing of the ignition device is retarded by the time corresponding to the interval
Output a drive signal for driving. Therefore, the rotation of the internal combustion engine
When the engine speed exceeds the set speed, the ignition timing is retarded and
The rise is suppressed, and the overspeed of the internal combustion engine is prevented. The above trigger circuit, monostable multivibrator
And the driving power of the comparator and the ignition device
For the output of a stabilized power supply circuit that receives the reverse voltage of the primary voltage as input
More given. [0005] An overspeed prevention device is provided.
In conventional ignition devices for internal combustion engines, the primary
Monostable multi-by
To get the trigger signal and search signal of the blater
You. Therefore, in the conventional ignition device, the ignition coil
A primary current detection resistor is connected in series with the primary current
Had to be inserted. Therefore, especially at low engine speeds
The secondary current of the ignition coil decreases when the primary current decreases during rotation.
There is a problem that the raw voltage decreases and the ignition performance decreases.
Was. Further, in the conventional ignition device, two monostable
Since a multivibrator had to be provided, the circuit configuration
Is not only complicated and costly, but also monostable
Due to differences in the characteristics of the components that make up the multivibrator,
The adjustment work for adjusting the variation of the retard characteristics
There was also a problem that it became complicated. A conventional ignition having an overspeed prevention function.
In the device, the rotation speed of the internal combustion engine is
When it exceeds, ignites by a predetermined constant retard amount
The timing was retarded in steps. That
The same ignition device can be installed in different internal combustion engines,
If the operating conditions of the engine are different,
Smooth rotation limit operation due to different rotation speed response characteristics
Sometimes it was not done. An object of the present invention is to impair ignition performance at low speed.
Over-rotation without incurring additional costs
A point for internal combustion engines that can have a stop function
To provide a fire device. [0010] Another object of the present invention is to provide a method suitable for different internal combustion engines.
Or the operating conditions of the engine are different,
Improve the engine speed response characteristics when the engine speed is limited.
To provide an ignition device for an internal combustion engine,
And there. [0011] The present invention is directed to an internal combustion engine.
The engine ignition device has a primary coil and a secondary coil,
Magnet whose at least primary coil is driven by an internal combustion engine
It is installed in the generator and synchronized with the rotation of the internal combustion engine.
Voltage of the first half cycle of one polarity and second voltage of the other polarity
A half-cycle voltage and a third half-cycle voltage of one polarity
AC voltage which appears sequentially in the internal combustion engine
And an ignition coil induced in the primary coil only once.
A second half-cycle voltage induced in the primary coil of the il
Primary current control, which conducts when current flows through the primary coil
Switch and the primary current when the primary current reaches the set value.
And a shutoff control circuit that shuts off the flow control switch.
It is a thing. In the present invention, the primary coil of the ignition coil is
Triggered when the first half-cycle voltage is induced in the
Time width set only once per revolution of the internal combustion engine
Monostable multivibrator generating a square wave signal with
And the integrating capacitor while the square wave signal is being generated.
Period during which the battery is charged with a fixed time constant and the square wave signal has disappeared
The integration capacitor is discharged with a constant time constant to
A triangular waveform rotation speed detection voltage is generated at both ends of the capacitor.
1 and the second product while the square wave signal is being generated.
Charge the capacitor, and when the square wave signal disappears,
Instantaneously discharges the second integration capacitor to generate an integrated voltage
A second integrating circuit, which detects the rotation speed and the speed of the internal combustion engine.
Proportional to the deviation from the set voltage that gives the target speed limit,
Target ignition timing with lower and upper limits restricted
Proportional / integral calculator for obtaining voltage and integrated voltage for target ignition
Voltage exceeds the target ignition timing voltage
When the output is in the first state and the integrated voltage is the target ignition
A comparator whose output is in the second state when the voltage is equal to or less than the timing voltage
And a comparator provided in parallel with the primary coil
When the output of the second coil is in the second state, the primary coil is turned on.
Short-circuited and shut off when the comparator output is in the first state
On and off according to the output of the comparator
And an ignition control switch for controlling the rotation speed. Internal combustion engine
If the rotation speed is less than the target speed limit,
From the position where the circuit turns off the primary current control switch.
At the advanced position, the integrated voltage exceeds the target ignition timing voltage.
When the engine speed exceeds the target speed limit
Indicates that the shutoff control circuit shuts off the primary current control switch.
At the position delayed from the position where
So that the voltage exceeds the lower limit and the upper limit of the target ignition timing voltage.
Set the limit value. With the above configuration, the rotation of the internal combustion engine
As the number increases, the target ignition timing voltage becomes the lower limit
And the upper limit, the second integral
When the integrated voltage generated by the circuit exceeds the target ignition timing
The position where the turn control ignition control switch is turned off is
The position is delayed as the rotational speed increases. Internal combustion engine
When the rotation speed is less than the target speed limit,
The ignition control switch for number control is the primary coulomb control switch.
It will be cut off at a position that is more advanced than the position where it will be shut off
The primary current is turned off when the primary current control switch is turned off.
And the ignition operation is performed. When the rotational speed of the internal combustion engine exceeds the target rotational speed limit
When the ignition control switch for controlling the number of revolutions is
The switch will be shut off at a position
The primary current is the switching position of the ignition control switch for controlling the rotational speed.
And the ignition position is delayed.
The retard amount of the ignition position depends on the number of revolutions of the internal combustion engine and the target
The greater the deviation from the number, the greater the value, and the maximum amount of retard
The value is limited to the value corresponding to the set upper limit of the target ignition timing voltage
Is done. As described above, according to the present invention, the rotation of the internal combustion engine is controlled.
When the number of revolutions exceeds the target speed limit,
The ignition timing is retarded by the retard amount corresponding to the deviation amount,
It operates to decrease the speed and approach the target speed limit.
Therefore, the internal combustion engine to which the ignition device is mounted and the internal combustion engine
Even when operating conditions are different, the internal combustion engine when the rotational speed is limited
Responsiveness can be improved. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1 to FIG.
An embodiment of the present invention will be described. FIG. 1 shows an ignition device for an internal combustion engine according to the present invention.
FIG. 3 is a block diagram showing an example of the circuit configuration of FIG. In the figure
1 is an ignition circuit, which is located inside a magnet generator.
Has a primary coil 2a and a secondary coil 2b
Ignition coil 2, primary current control switch 3 and shutoff
And a control circuit 4. Primary coil 2a
Is synchronized with the rotation of the internal combustion engine as shown in FIG.
First half cycle of one polarity (negative polarity in the example shown)
Voltage V11 and the other polarity (positive in the illustrated example)
The second half cycle voltage V12 and the third half cycle of one polarity.
And the voltage V13 of the internal combustion engine.
Occurs only once per revolution. In this example, the primary current control
Current control circuit by switch 3 and cutoff control circuit 4
A road 5 is formed, and a primary line 2a
To generate a voltage V12 of the second half cycle of the positive polarity in the direction of the mark.
When the primary current control switch 3 is turned on, the primary coil
Primary current is passed through the cable 2a, and the primary current reaches the set value.
Sometimes, the cutoff control circuit 4 cuts off the primary current control switch 3.
The ignition coil is turned off to cut off the primary current of the ignition coil. This one
The interruption of the secondary current causes the secondary coil 2b of the ignition coil to
Induces high voltage for fire. 6 is attached to the cylinder of the internal combustion engine
The spark plug is used to connect the secondary coil 2b of the ignition coil.
It is connected. 7 is between the primary terminals 1a and 1b of the ignition circuit 1.
The connected rotation speed limiting circuit
Is a stabilized power supply circuit 8 and a monostable multivibrator 9
A first integration circuit 10 and a second integration circuit 11;
Target limit rotation speed setting circuit 12 and proportional / integral calculator 13
, A comparator 14 and an ignition control switch 15 for controlling the rotational speed.
It consists of: The stabilized power supply circuit 8 includes a power supply
Power supply circuit and monostable multivibrator
Also serves as a trigger signal generation circuit that generates a trigger signal
Circuit of the primary coil 2a in the direction indicated by the dashed arrow in FIG.
And the voltage of the third half cycle
A constant DC voltage Vcc, which is the power supply voltage, is generated.
The next coil 2a generates a half-cycle voltage of one polarity
For half a cycle of the other polarity
The square wave voltage Vt whose level differs between
It is generated in synchronization with the induced voltage of the coil 2a. Square wave voltage V
t is the AC voltage generated by the primary coil of the ignition coil, for example.
When the first half cycle of pressure is started, the second half cycle
Start of the third half cycle
High level at the end of the third half cycle
Falling from low to high or low to high
The voltage becomes a rectangular wave voltage at which a rising edge appears. The monostable multivibrator 9 includes an ignition coil
Primary coil 2a generates a voltage for the first half cycle
Triggered by the edge of the square wave voltage Vt that appears when
And the time set only once per revolution of the internal combustion engine
A rectangular wave signal VT having a width is generated. The first integrating circuit 10 generates the rectangular wave signal VT
During the generation, the first integrating capacitor is set to a constant time constant.
1st integration during charging and when the square wave signal VT is extinguished
The capacitor is discharged at a constant time constant to
Generates triangular waveform rotation speed detection voltage VN at both ends of the capacitor.
You. The second integrating circuit 11 outputs the square wave signal VT
Charge the second integrating capacitor during the
When the signal disappears, the second integrating capacitor is instantaneously released.
To generate an integrated voltage Vc. The target speed limit setting circuit 12 is an internal combustion engine.
Target rotation speed as a set voltage that gives the target rotation speed
This circuit generates the rotation speed voltage VNr,
The pressure VNr is calculated as a proportional / integral operation together with the rotation speed detection voltage VN
Container 13. The proportional / integral calculator 13 calculates the rotational speed detection voltage.
Proportional to the deviation between VN and the target speed limit voltage VNr.
Target ignition timing with lower and upper limits restricted
Generates a voltage Vθ. The comparator 14 calculates the integral voltage Vc and the target ignition time.
And the integrated voltage Vc is set to the target ignition timing.
When the voltage exceeds Vθ, the first state (for example, low level
State), and the integrated voltage Vc becomes the target ignition timing voltage V
When it is less than θ, it enters the second state (for example, high level state).
The following output voltage Vs is generated. The ignition control switch 15 for controlling the number of revolutions
The switch element connected in parallel to the secondary coil 2a
The switching element is provided with an output voltage of the comparator 14.
When Vs is in the first state, it is turned off and the comparator
14 is in the conducting state when the output voltage Vs is in the second state.
Is turned on according to the output voltage Vs of the comparator 14
Controlled off. In the ignition device shown in FIG.
When the number of revolutions reaches the target speed limit, the cutoff control circuit 4
At the position where the primary current control switch 3 is turned off.
The divided voltage Vc exceeds the target ignition timing voltage Vθ.
Thus, the value of the target speed limit voltage VNr is set.
You. The rotation speed of the internal combustion engine is equal to the target speed limit.
Is less than the primary current control switch.
Integral voltage at a position advanced from the position where switch 3 is turned off
Vc exceeds the target ignition timing voltage Vθ.
The lower limit value of the timing voltage Vθ is set. Further, the rotational speed of the internal combustion engine is equal to or less than the target rotational speed limit.
When it comes up, the cutoff control circuit 4 switches the primary current control switch.
In a position sufficiently delayed from the position where switch 3 is turned off
At the set maximum retard position, the integrated voltage Vc becomes the target ignition voltage.
At the time of the target ignition so that the upper limit of Vθ is exceeded.
The upper limit value of the initial voltage Vθ is set. Therefore, when the rotational speed of the internal combustion engine reaches the target speed limit
If the number is less than the number, the shutoff control circuit 4
Integrate at a position further than the position where switch 3 is turned off
When the voltage Vc exceeds the target ignition timing voltage Vθ, the rotation speed is controlled.
Since the ignition control switch 15 is turned off, the ignition
The primary current control switch 3 cuts off the primary current of the coil 2
The switch is turned off at the position where the switch is turned off.
Therefore, the ignition control switch 15 for controlling the rotation speed
Has no effect on the period. When the rotation speed of the internal combustion engine exceeds the target speed limit
, The primary current control switch 3 is turned off.
Ignition control for speed control up to a position later than
Since the switch 15 maintains the conductive state,
A position where the ignition control switch 15 for controlling the rotation speed is in a cut-off state.
The primary current is interrupted by the switch. Ignition control switch for speed control
Position where the primary current is interrupted by the
Timing) is the deviation between the internal combustion engine speed and the target speed limit.
The primary current control switch 3 is turned off according to the amount.
Between the maximum retard position and the maximum retard position. FIGS. 2 and 3 show the circuit of each part of FIG.
FIG. 2 shows a specific example of the ignition circuit unit 1.
FIG. 3 shows an example of a typical circuit configuration, and FIG.
Each shows an exemplary circuit configuration example. FIG. 4 is a circuit diagram of each part of the circuits shown in FIGS.
The voltage waveform is shown for the rotation angle θ of the crankshaft of the internal combustion engine.
are doing. The waveform shown by a broken line in FIG.
Indicates that the rotation speed is less than the rotation speed limit.
The waveform indicated by the solid line has a limited number of rotations.
This is a waveform when the rotation speed is exceeded. 2 and 3, the ignition circuit 1 has a primary
A transistor using a transistor as the current control switch 3
In the transistor type ignition circuit, the ignition coil 2 is not shown.
Installed in a magnet generator driven by an internal combustion engine
I have. The magnet generator is mounted on the outer periphery of the flywheel, for example.
A permanent magnet is mounted in the recess provided, and the permanent magnet is
By magnetizing in the radial direction of the rye wheel,
A well-known flywheel magnet rotor that formed a stone field,
Each magnetic pole part facing the magnetic pole of the magnet rotor is
Connecting the pair of legs and the rear end side of the pair of legs to each other
A primary U-shaped armature core with a yoke
Coil formed by winding the coil 2a and the secondary coil 2b
2 in synchronization with the rotation of the internal combustion engine.
Of one polarity in the direction of the dashed arrow shown in FIG.
The voltage V11 in the first half cycle and the voltage V11
The voltage V12 of the second half cycle of the other polarity is
Voltage V13 of the third half cycle of one polarity in the direction of the line arrow
Is applied once per revolution of the internal combustion engine
Only induce. In the illustrated example, the primary current control switch 3
NPN transistor TR connected to Darlington
1 and the collector electrode of the transistor TR1.
Circuit between transmitters with primary facing collector
It is connected in parallel to the coil 2a. The shutoff control circuit 4 is provided with a transistor TR1.
A resistor R1 connected between the collector and the base and a transistor
The anode faces the base between the base and emitter of the transistor TR1.
Thyristor Th1 that is connected to
Connected to the collector and emitter of transistor TR1
Is a resistor R commonly connected to the gate of the thyristor Th1.
2 and R3. For primary current control
Primary current control circuit by switch 3 and cutoff control circuit 4
5 are configured. In the illustrated ignition circuit 1, an ignition coil
To the primary coil 2a in the direction indicated by the solid arrow shown in FIG.
When the voltage of the transistor is induced, a resistance
A base current is supplied through R1 and the transistor T
R1 becomes conductive and a primary current flows through the ignition coil 2.
You. With the rise of the primary current, the transistor TR1
The collector-emitter voltage increases. Transistor TR
When the collector-emitter voltage of 1 reaches the set value,
The voltage across R3 reaches the trigger voltage of thyristor Th1
Therefore, the thyristor Th1 conducts. Thyristor Th1
Is turned on, the base current of transistor TR1 is increased.
Since the transistor TR is bypassed through the lister Th1,
1 is shut off. Limit speed at which the speed of the internal combustion engine is set
Transistor TR1 is turned off
The ignition system for controlling the rotation speed of the rotation speed limiting circuit 7 before entering the state
Since the control switch 15 is turned off, the transistor T
Primary current of the ignition coil 2 when R1 is cut off
Is shut off. As a result, the high voltage for ignition is applied to the secondary coil 2b.
Pressure is induced, sparks are generated in the spark plug 6 and the engine is ignited
Is done. FIG. 4A shows a state in which both ends of the primary coil 2a are not formed.
Which shows the waveform of the primary voltage V1 of the internal combustion engine.
At the angular position θ1, the voltage of the first half cycle rises,
The transistor TR1 is turned off at the rotation angle position θi1.
You. The stabilized power supply circuit 8 of the rotation speed limiting circuit 7
Primary terminal drawn from the non-ground terminal of the primary coil
1b with anode connected to common line CL
One end is connected to the diode D1 and the cathode of the diode D1.
Connected to the connected capacitor C1 and the primary terminal 1a of the ignition circuit.
Connect the cathode to the extended ground line GL and connect the anode
A diode D2 connected to the other end of the capacitor C1;
The anode of the diode D1 and the anode of the diode D2
Between the resistor R4 connected between the
A diode D3 connected to the anode and a diode D
3 and a capacitor connected between the primary terminal 1b.
And the zener connected across capacitor C2.
And a diode ZD1. In the power supply circuit 8, the primary coil 2
a of the first and third half cycles in the direction of the dashed arrow shown in FIG.
When a voltage is induced, the capacitor C1 is charged to the polarity shown.
And the diode across the capacitor C1
The capacitor C2 is charged through D3 and the resistor R4.
You. The charging voltage of the capacitor C2 is a Zener diode
It is kept at the zener voltage of ZD1. DC constant voltage obtained at both ends of the capacitor C2
The pressure Vcc is equal to the monostable multivibrator 9 and the first and second
2 integration circuits 10 and 11 and target limit rotation speed setting circuit
12 and the comparator 14 as power supply voltages.
You. The illustrated stabilized power supply circuit 8 generates a trigger signal.
It also serves as a circuit and is pulled from the cathode of diode D1.
The output terminal 8a is a trigger signal output terminal.
Between the trigger signal output terminal 8a and the primary terminal 1b of the ignition circuit.
The voltage obtained between the common line CL and the
The second half voltage V11 of the first half cycle and the third half
And the capacitor C1 is opened.
When starting, it corresponds to the forward voltage drop of diode D1
To a low level and charge the capacitor C1
Maintain the low level while the current is flowing, the capacitor
When the charging of C1 is completed, the terminal voltage of capacitor C2
Rise to a level approximately equal to Therefore, the trigger signal output terminal 8a and the common line
As shown in FIG. 4 (B), the primary
Ia 2a is the voltage V11 and V11 of the first and third half cycles.
13 at the rotational angular positions θ1 and θ2 that generate
A falling rectangular wave voltage Vt is obtained. In this example, a square wave
Falling voltage change at the rotation angle position θ1 of the voltage Vt
Is the trigger signal Vt1 of the monostable multivibrator 9.
It is given to the trigger terminal. The monostable multivibrator 9 is a
Timer IC 9A (for example, Hitachi
HA17555 or equivalent).
The second is charged through the resistor R5 by the DC constant voltage Vcc.
And the power supply terminal of the timer IC 9A
Between the output terminal and the output terminal.
Resistor R6 for stabilizing
For noise prevention connected to the control voltage terminal of A
A capacitor C4, and a ground terminal of the timer IC 9A.
The other end of the capacitor C4 is connected to the primary terminal 1 of the ignition circuit 1.
b connected to a common line CL connected to
A threshold terminal and discharge terminal
Is connected to the connection point of the resistor R5 and the capacitor C3.
You. The reset terminal of the timer IC 9A is connected to the power terminal.
The DC constant voltage Vcc is supplied to the power supply terminal.
You. In this example, the resistor R5 and the second integrating capacitor C3
The second integration circuit 11 is configured by the above. A pulse signal is applied to the trigger terminal of the timer IC 9A.
When the pressure Vt is not applied, the second integration capacitor
The sensor C3 is the discharge trap inside the timer IC 9A.
Discharge by the transistor. At the rotation angle position θ 1 of the internal combustion engine, a rectangular wave voltage
The falling change of Vt is the trigger signal Vt1 (see FIG. 4B).
Is applied to the trigger terminal of the timer IC 9A as
The flip-flop circuit inside the timer IC 9A is set
The output of the output terminal becomes high level, and the second integration
A constant time constant τ (=
R5 · C3). The voltage across capacitor C3
Flip-flop when pressure reaches threshold voltage
The reset circuit resets the capacitor C3 instantaneously.
The output of the output terminal returns to the low level state again.
You. Therefore, the timer IC 9A outputs from its output terminal
As shown in FIG. 4C, a fixed time width that is a monostable time
And outputs a square wave signal VT having a T.
An integrated voltage Vc having a waveform shown in FIG.
You. The timer IC 9A detects that the rotation angle
When entering the monostable operation, the rotation angle position θ during the monostable period
Even if the pulse voltage Vt2 is applied in step 2, it is possible to trigger again.
And not. The constant time width T of the square wave signal VT is calculated in this example.
Then, T = 1.1 × R5 · C3. The first integrating circuit 10 includes a resistor R7 and a first
The first integrating capacitor C5.
5 indicates that the rectangular wave signal VT is generated while the rectangular wave signal VT is being generated.
Charge with a constant time constant, and the rectangular wave signal VT disappears.
Discharge with a constant time constant during the operation. Therefore, the capacitor C
The number of rotations of the triangular waveform as shown in FIG.
A detection voltage VN is generated. Monostable multivibrator 9
The time width T of the rectangular wave signal VT output from the
The first integral control is performed as the rotational speed of the internal combustion engine increases.
Since the discharging time of the capacitor C5 becomes short, the first integrating circuit
The level of the rotation detection voltage VN of the triangular waveform generated at 10.
Becomes higher as the rotational speed of the internal combustion engine becomes higher. The target speed limit setting circuit 12 includes a resistor R8
And a voltage dividing circuit consisting of a series circuit of R9.
Dividing the constant DC voltage Vcc and connecting the resistors R8 and R9
Between the point and the common line CL.
appear. Detection of rotation speed generated by first integration circuit 10
The voltage VN is a voltage obtained by the target speed limit setting circuit 12.
To the proportional / integral calculator 13 together with the target speed limit voltage VNr
Has been entered. The proportional / integral calculator 13 detects the rotational speed.
By calculating the difference between the voltage VN and the target speed limit voltage VNr,
Gives the deviation between the engine speed and the target speed (rotational speed deviation)
The rotation speed deviation signal VNd (= VN -VNr)
Multiplying the rotational speed deviation signal VNd by a proportional constant Kp
To obtain the proportional control signal VNp = VNd × Kp
And time integration of the rotation speed deviation signal VNd
Integrator that obtains VNi = Ki ∫VNd · dt (Ki is an integration constant)
And the upper and lower limits of the integral control signal VNi, respectively.
Limiting circuit. The proportional / integral calculator 13 is
Set the deviation between the engine speed and the target speed to zero or
At the time of target ignition that gives the ignition timing necessary to suppress
Output the initial voltage Vθ. The proportional / integral calculator 13 shown in FIG.
The output voltage VN and the target speed limit voltage VNr are input.
The operational amplifier OP1 and the output of the operational amplifier OP1 are input.
Operational amplifier OP2, integrating capacitor C6, and resistor R
Consists of 10 to R18 and diodes D4 and D5
Have been. The operational amplifier OP1 has a positive-phase input terminal connected to a resistor R.
10 is connected to the output terminal of the first integrating circuit 10 via
The opposite-phase input terminal of the operational amplifier OP1 is connected via a resistor R11.
Connection between the resistors R8 and R9 of the target speed limit setting circuit 12
Connected to a point. The output terminal of the operational amplifier OP1 is
The other end of the resistor R12 is connected to one end of the resistor R12 and the primary terminal.
Integrating capacitor between the common line CL connected to 1b
C6 is connected. The other end of the resistor R12 is connected to the output terminal
The positive terminal of the operational amplifier OP2 directly connected to the negative-phase input terminal
Output terminal of the operational amplifier OP2
Is connected to the positive-phase input terminal of the operational amplifier OP1 through the resistor R13.
It is connected. Opposite phase input to the output terminal of operational amplifier OP1
A feedback resistor R14 is connected between the input terminal and the input terminal. The operational amplifier OP1 and the resistors R10, R11 and R
And 14 constitute a proportional operation unit.
The proportional control signal obtained at the output terminal of P1 is the resistor R12 and
The time is integrated by an integrating circuit consisting of an integrating capacitor C5.
You. The integrated voltage is increased by the arithmetic operation that constitutes the voltage follower.
The signal is fed back to the input side of the operational amplifier OP1 through the amplifier OP2.
The target ignition timing voltage is applied to the output terminal of the operational amplifier OP1.
Vθ is obtained. Upper limit and lower limit of target ignition timing voltage Vθ
, The DC constant voltage Vcc is divided by the resistors R15 and R16.
A voltage dividing circuit for obtaining a divided voltage VH by applying a voltage, and a DC constant voltage Vcc.
Is divided by resistors R17 and R18 to obtain a divided voltage VL.
And a resistor R12 connected to the output terminal of the operational amplifier OP1.
One end of the capacitor C6 connected through the
Through a diode D4 with the anode facing the capacitor C6 side.
It is connected to the connection point between the resistors R15 and R16. Capacitor
One end of C6 also has a cathode facing the capacitor.
Connected to the junction of resistors R17 and R18 through the diode D5
Have been. Thus, the output terminal of the operational amplifier OP1 is
The upper limit of the obtained target ignition timing voltage Vθ is the divided voltage VH
And the lower limit is limited to the divided voltage VL. Target ignition timing voltage Vθ and second integration circuit
The integrated voltage Vc obtained from the comparator 11 is
It is input to the positive phase input terminal and the negative phase input terminal. Comparator 1
4 compares the integrated voltage Vc with the target ignition timing voltage Vθ (see FIG.
4E), and the integrated voltage Vc becomes the target ignition timing voltage Vθ.
The potential Vs of the output terminal in the first state
State (low level state in this example), and the integrated voltage Vc is
The potential of its output terminal when it is lower than the target ignition timing voltage Vθ
Let Vs be the second state (high level state in this example)
(See FIG. 4F). The ignition control switch 15 for controlling the rotational speed shown in the figure.
Are connected to the ground line GL and the common line CL, respectively.
NPN transistor TR to which a transistor and an emitter are connected
2 and a diode having an anode connected to the output terminal of the comparator 14.
Iodine D6, anode of diode D6 and power supply circuit
A resistor R19 connected between the output terminal of
Between the cathode of the transistor D6 and the base of the transistor TR2.
And the cathode of the diode D6.
Connected to the cathode, the anode of the transistor TR2
A diode D7 connected to the emitter.
And a resistor R19, a diode D6 and a resistor R20.
To supply a base current to the transistor TR2.
A flow supply circuit is configured. The transistor TR2 is
The output of the comparator 14 is in the first state (low level state).
When the output of the comparator 14 is in the second state.
State (high-level state) when conducting
Then, on / off control is performed according to the output of the comparator 14. In the illustrated ignition device, the rotational speed of the internal combustion engine is
When the target speed limit is reached, the primary current control
Angle position approximately equal to the angle position θi1 at which the switch 3 is shut off.
So that the integral voltage Vc exceeds the target ignition timing voltage Vθ
Is set to the set value of the target speed limit voltage VNr.
You. When the rotation speed detection voltage VN is equal to the target limit rotation speed,
When the voltage is lower than the several voltage VNr (at this time, the operational amplifier OP1
Output terminal potential becomes negative) and the target ignition timing voltage Vθ
Has reached the lower limit value VL, and the rotational speed of the internal combustion engine
When the number of turns is less than the number of turns, the primary current control switch 3 is shut off.
Position beyond the angular position θi1 (for example,
At the angular position θi ′ in 4E, the integrated voltage Vc ′ becomes the target point.
The lower limit value VL is set so that the ignition timing voltage Vθ 'is exceeded.
Selected. Therefore, the rotational speed of the internal combustion engine is limited to the target limit.
When the speed is lower than the rotation speed, the primary current control switch
Rotation speed at a position ahead of the position θi1 where 3 is in the cutoff state
Since the limiting ignition control switch 15 is turned off,
The primary current control switch 3 interrupts the primary current of the fire coil 2.
Is interrupted at the angular position θi1 where the
Seki is ignited. The rotation speed of the internal combustion engine exceeds the target speed limit.
The engine speed is higher when the engine speed is higher.
The deviation between the detection voltage VN and the target speed limit voltage VNr is large.
The target ignition timing voltage Vθ increases, and the integral voltage
The position .theta.i where Vc exceeds the target ignition timing voltage V.theta.
As shown in E, the primary current control switch 3 is turned off.
The position θi is later than the angular position θi1 in the state. Therefore, the rotational speed of the internal combustion engine is limited to the target limit.
When the rotation speed is exceeded, the primary current control
At position θi which is later than position θi1 at which
The ignition control switch 15 for limiting the number of revolutions
The primary current of the ignition coil 2 is cut off. Therefore, ignition
The timing is delayed to the angle position θi which is later than the original ignition timing.
Corner. The amount of retard of the ignition timing (θi-θi1) is
The deviation between the output voltage VN and the target speed limit voltage VNr (VN−
VNr), the target ignition timing voltage V
Since θ is limited to the upper limit value VH, the maximum ignition timing
The retard position is determined when the target ignition timing voltage Vθ is at the upper limit value VH.
The ignition timing is limited to θi2. The other pole is connected to the primary coil of the ignition coil.
Later than the position induced by the voltage V12 of the second half cycle of the
When the maximum retard position θi2 is set at the
Is used for ignition when the ignition timing reaches the maximum retard position θi2.
Since no high voltage is generated, the engine is misfired. FIG. 5 shows the rotation of the internal combustion engine in the above example.
Ignition advance characteristics showing change of ignition timing θi with respect to number N
In the region where the rotation speed N is less than the target limit rotation speed Ns,
The fire timing θi is kept at a substantially constant angular position θi1. rotation
In the region where the number N exceeds the target speed limit Ns, the ignition timing
When θi is within the range from θi1 to the maximum retard position θi2,
It changes according to the number N. The engine speed N exceeds the target speed limit Ns.
The engine speed N and the target speed limit
The amount of retardation according to the magnitude of the deviation (N-Ns) from the number Ns
The ignition timing of the engine is delayed, which causes the engine output to decrease
Acts to reduce the number of revolutions. The rotation speed drops
The retard amount also decreases as it approaches the target speed limit Ns.
When the engine speed reaches the target speed limit Ns or
Settles at a speed close to. Therefore, the output
Internal combustion engines with different sizes or operating conditions of the engines
Speed response with good responsiveness even if
Operation or the governing operation of the engine can be performed automatically.
Wear. In the above example, the target limit rotation speed voltage VNr is
The generated target speed limit setting circuit 12 is connected to a fixed resistor R8
And a voltage divider composed of a series circuit of R9.
One of the resistors R8 and R9 constituting the pressure
Potential of using a variable resistor or moving the voltage dividing point
The set value of the target speed limit voltage VNr is
If you can change it by manual operation,
The target speed limit of the internal combustion engine can be made variable. In the above example, the primary terminal 1 of the ignition circuit 1
a, 1b by simply connecting the rotation speed limiting circuit unit 7
It is possible to constitute an ignition device for an internal combustion engine having a limiting function.
Not only can the output with the ignition circuit 1 differ
Good rotation using the same speed limit circuit 7 for the fuel engine
Number limiting characteristics can be obtained. In the above example, the ignition control
The control switch 15 is provided in parallel with the primary coil 2a.
The ignition control switch for controlling the rotational speed.
The transistor TR2 constitutes the primary current control switch 3.
Connected in parallel with the primary coil 2a together with the transistor TR1
The rotation speed limiting circuit 7 is integrated with the ignition circuit 1.
By omitting the transistor TR2,
The function of the transistor TR2 is shared by the transistor TR1.
You can also make it fall. That is, the ignition control switch for controlling the rotational speed
15 transistor TR2 is removed and one end is
The other end of the resistor R20 connected to the cathode of the
Transistor constituting switch for primary current control of path 1
Connected to the base of TR1 and the transistor TR
Between the thyristor Th1 anode and the base of the thyristor Th1
Diode facing the base of transistor TR1
The transistor TR1 and the diode D
6 and D7 and resistors R19 and R20 for speed control
The fire control switch 15 is configured. With this configuration, the rotational speed of the internal combustion engine
Is less than the target rotational speed Ns and the angular position θi1
The output Vs' of the comparator 14 is at a low level
, The transistor TR1 is connected to the primary coil 2
The base current is applied through the resistor R1 by the voltage across the terminal a.
Thyristor Th1 conducts at angular position θi1
Then, the state is cut off and the ignition operation is performed. Internal combustion
The engine speed has exceeded the target speed limit Ns.
(For example, the angle shown in FIG. 4F)
At the position θi), the output Vs of the comparator 14 is in a low level state.
In this case, the transistor TR1 is turned on at the angular position θi.
The ignition operation is performed in the cutoff state. As above
If the transistor TR2 is omitted, the rotation speed limiting circuit
It is necessary to configure the part 7 integrally with the ignition circuit 1
An internal combustion engine ignition system with a
Can be achieved. In the above ignition device for an internal combustion engine,
The set value of the target speed limit can be adjusted manually.
The fuel supply amount such as throttle bubble can be adjusted
Use a mechanical or electric governor to operate the joint device
Speed control function with better responsiveness and controllability than
It is possible to construct a low-cost internal combustion engine ignition device
it can. As described above, according to the present invention, the internal combustion engine
Engine ignition when the engine speed exceeds the target speed limit
I'll limit the rise in rotation speed by retarding the timing
The internal combustion engine ignition device,
Depending on the magnitude of the deviation from the target speed limit, the ignition timing
Automatically when the retard amount is within the set maximum retard amount
Controlled so that the same ignition device can be
Used in an internal combustion engine or the operating conditions of the engine are different
Even in this case, it is possible to accurately obtain the rotation speed limiting characteristics.
Wear.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a basic circuit configuration of an internal combustion engine ignition device according to the present invention. FIG. 2 is a circuit diagram showing a specific example of an ignition circuit unit used in the ignition device according to the present invention. FIG. 3 is a circuit diagram showing a specific example of a rotation speed limiting circuit used in the ignition device according to the present invention. FIG. 4 is a waveform chart showing an example of a voltage waveform of each part of the circuits of FIGS. 2 and 3; FIG. 5 is a diagram showing an example of ignition characteristics obtained by the ignition device according to the present invention. [Description of Signs] 1 ... ignition circuit, 2 ... ignition coil, 2a ... primary coil, 2
b ... secondary coil, 3 ... switch for primary current control, 4 ... cutoff control circuit, 5 ... primary current control circuit, 6 ... ignition plug,
7: rotation speed limiting circuit, 8: stabilized power supply circuit, 9: monostable multivibrator, 9A: timer IC, 11: first integration circuit, 12: second integration circuit, 13: target limiting rotation speed setting circuit , 14 ... proportional / integral calculator, 15 ... comparator,
16: ignition control switch for controlling the number of revolutions, OP1: operational amplifier, OP2: operational amplifier, C3: second integrating capacitor, C5: first integrating capacitor.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-153263 (JP, A) JP-A-59-229056 (JP, A) JP-A 5-66272 (JP, U) JP-A 59-29072 126179 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02P 3/08 F02P 11/02

Claims (1)

(57) [Claim 1] It has a primary coil and a secondary coil, and at least the primary coil is provided in a magnet generator driven by the internal combustion engine to synchronize with the rotation of the internal combustion engine. An AC voltage, in which the voltage of the first half cycle of one polarity, the voltage of the second half cycle of the other polarity, and the voltage of the third half cycle of one polarity sequentially appear, is changed to 1 V per rotation of the internal combustion engine. An ignition coil that induces a primary coil only once; a primary current control switch that conducts when a voltage of the second half cycle is induced in the primary coil of the ignition coil and causes a primary current to flow through the primary coil; An ignition control circuit for shutting off the primary current control switch when the current reaches a set value, wherein the voltage of the first half cycle is induced in the primary coil. A monostable multivibrator for generating a rectangular wave signal having a fixed time width only once per revolution of the internal combustion engine when triggered by a first integration capacitor while the rectangular wave signal is being generated. Charging the battery with a constant, discharging the first integration capacitor with a constant time constant during a period in which the rectangular wave signal is extinguished, and generating a triangular waveform rotation speed detection voltage across the first integration capacitor. (1) charging the second integration capacitor while the rectangular wave signal is being generated, and instantaneously discharging the second integration capacitor when the rectangular wave signal disappears to generate an integrated voltage. A second integration circuit, which performs a proportional and integral calculation on a deviation between the rotation speed detection voltage and a set voltage for providing a target limit rotation speed of the internal combustion engine to obtain a target ignition timing voltage with a lower limit and an upper limit limited. Proportional, integral An arithmetic unit for comparing the integrated voltage with the target ignition timing voltage, and when the integrated voltage exceeds the target ignition timing voltage, the output is in the first state and the integrated voltage is equal to or less than the target ignition timing voltage And a comparator whose output is in a second state, which is provided in parallel with the primary coil, conducts when the output of the comparator is in the second state and short-circuits the primary coil, A rotational speed control ignition control switch that is turned on and off in accordance with the output of the comparator so that the output of the comparator is turned off when the output of the internal combustion engine is in the first state; Is less than the target speed limit, the integrated voltage exceeds the target ignition timing voltage at a position advanced from a position at which the cutoff control circuit turns off the primary current control switch, and the rotation speed of the internal combustion engine is reduced. The number is the eye When the rotation speed becomes equal to or higher than the limit rotation speed, the target ignition timing is set so that the integrated voltage exceeds the target ignition timing voltage at a position delayed from a position where the cutoff control circuit turns off the primary current control switch. An ignition device for an internal combustion engine, wherein a lower limit value and an upper limit value of a voltage are set.