JP3478166B2 - Igniter control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
The igniter always energizes the primary winding of the ignition coil
Has a protection function to stop operation and protect the igniter
The present invention relates to an igniter control device. [0002] 2. Description of the Related Art Conventionally, one of ignition devices for an internal combustion engine is used.
Power to energize and de-energize the primary winding of the ignition coil
By switching through the transistor, the ignition coil
A high voltage for ignition is generated in the secondary winding of the
An igniter that discharges sparks from the connected spark plug
Have been. An igniter is a power transistor.
To switch the primary winding between energized and deenergized
Therefore, for example, a generator (al
Abnormal voltage generated by the
The battery may be damaged by applying high-voltage noise to the power supply line.
If the re-voltage is higher than normal (for example,
When the battery voltage rises to around 30V)
-An overcurrent flows through the transistor and the power transistor
And its peripheral elements are deteriorated or destroyed, and the igniter
It may not operate normally. [0004] For this reason, conventionally, the igniter has been controlled by a drive.
The igniter control device controls the battery voltage
If the voltage is exceeded, the drive signal output to the igniter (in other words,
(If the primary winding is energized)
Have been. The following is an example of a conventional igniter control device.
explain. FIG. 4 shows a configuration of a conventional igniter control device.
It is an electric circuit diagram showing an example. Igniter control shown in FIG.
The device is a cylinder group that groups each cylinder of the engine.
(A plurality of igniters 10 are provided for each
Output circuit 20) and an ignition circuit (not shown)
Switch is turned on and the ignition switch is turned on.
Power line L receiving power supply from the positive electrode side of the battery
After the voltage of B (battery voltage) + B rises,
During a fixed period (several tens of msec.), Each of the output circuits 20
Operation of stopping the output of the drive signal to the corresponding igniter 10
Power-on output stop circuit 30 for stopping power
Stop operation of each output circuit 20 when voltage + B is abnormal.
And a voltage abnormality output stop circuit 40 for
I have. Here, each cylinder group is provided with
Igniters 10 and corresponding outputs
The circuits 20 have the same configuration. Therefore, the following theory
In Ming, igniter 1
0 and one circuit configuration of the output circuit 20 will be described.
You. As shown in FIG. 4, the igniter 10 has one end.
Is connected to the positive side of the battery via the ignition switch.
The other end of the primary winding of the connected ignition coil and the battery
Provided between the body side ground line where the negative electrode side is grounded
The conduction path to the primary winding of the ignition coil
Switch between energizing and de-energizing the primary winding
The collector is the primary winding of the ignition coil
Connected, and the emitter is grounded via a small resistor R11.
NPN-type power transistor T1 grounded to the line
1 and the collector is the collector of the power transistor T11
And the emitter is connected to the base of the power transistor T11.
Drive transistor T12 of NPN type
And [0008] These two transistors T11, T12
Constitutes a so-called power Darlington transistor
And the control terminal of the drive transistor T12.
Each source receives a high-level drive signal.
A base current flows through the transistors T11 and T12,
The transistors T11 and T12 are turned on, and the ignition coil
Current will flow through the primary winding of the motor. The igniter 10 includes a drive transistor.
The collector is connected to the base of the star T12,
Emitter of power transistor T11 via anti-R12
, And the emitter is grounded to the ground line.
A PN-type protection transistor T13 is provided. Soshi
The protection transistor T13 has a power transistor
The current flowing through the primary winding of the ignition coil through the
When the voltage across the minute resistor R11 becomes excessive,
The forward voltage between the base and the emitter of the transistor T13 (approximately
0.7V)
And the driving transistor T12,
-Transistor T11 is forcibly turned off and the power
The transistor T11 is protected from overcurrent. Also, the base of the driving transistor T12
Drives the output circuit 20 via the resistors R13 and R14.
Connected to the signal output terminal Sa and via the resistor R13
And connected to the drive signal pull-in terminal Sb of the output circuit 20.
And a connection point between the resistors R14 and R13.
Is a Zener whose anode is grounded to the ground line.
The cathode of the anode ZD1 is connected. In addition, this
The Zener diode ZD1 is connected to an output
The voltage level of the drive signal input to the
-By limiting the breakdown voltage of the diode ZD1 to the breakdown voltage or less.
The driving signal input to the igniter 10 is
When a high voltage is reached, the drive signal
Excessive base for transistors T11 and T12 in
Prevents current from flowing and deteriorating or destroying them
It is for doing. On the other hand, the output circuit 20
Data from the engine control device 50 composed of
Ignition control signal IG received at input terminal Sin
Turns on / off the 10 power transistors T11
The ignition control signal IG is set to High level.
When a bell (for example, DC 5 V) is used, a drive signal output terminal
To connect the power line LB from the battery to Sa
From the drive signal output terminal Sa to the igniter
The drive signal is set to High level (battery voltage + B)
Drive signal (battery voltage + B) and igniter 10 side circuit
Current for driving power transistor T11 determined by constant
(Specifically, the base current of the driving transistor T12)
Current outflow circuit 22 and the ignition control signal IG are low.
When the signal is at a bell (ground potential), the drive signal pull-in terminal S
By connecting b to the ground line,
Flow out from the drive signal output terminal Sa to the igniter 10
The igniter 10
Current outflow stop circuit 24 for quickly turning off the star T11
It is composed of The current outflow circuit 22 includes a battery
Is connected to the power supply line LB from the
Is a PNP-type output transistor connected to the drive signal output terminal Sa.
Transistor T21 and base of output transistor T21
A resistor R21 provided between the power supply line LB and the
Is connected to the output transistor T21 via a resistor R22.
Connected to base, emitter connected to ground line
NPN control transistor T22
The ignition control signal IG from the control device 50 is connected to the ground line.
And applied to the base of control transistor T22
And resistors R23 and R24 for voltage division.
Between the emitter and the collector of the output transistor T21,
Using the output terminal Sa as the anode, a noise absorbing die
The ode D23 is connected. On the other hand, the current outflow stop circuit 24
For operation of the control device 50 and the igniter control device
From a constant voltage power supply (power supply IC) 60 for supplying a constant voltage of
Operates in response to output voltage Vcc (DC constant voltage; for example, 5 V)
Power supply line from the constant voltage power supply 60.
Connected to the connection LC. The current outflow stop circuit 24
Is connected to the drive signal lead-in terminal Sb, and the emitter is
NPN-type current sinking transistor grounded to land line
And the base of the current pull-in transistor T23.
A resistor R25 provided between the emitters and the collector are resistors
To the base of the current pull-in transistor T23 via R26
Power line connected from constant voltage power supply 60
PNP type control transistor T24 connected to LC
And between the base and the emitter of the control transistor T24.
And the anode is connected through a resistor R28.
And connected to the base of the control transistor T24.
Is connected to the input terminal Sin of the ignition control signal IG.
And a diode D21. In the output circuit 20 configured as described above,
Ignition control signal IG output from engine control device 50
Is high level (for example, 5V), the current outflow circuit
The control transistor T22 on the 22 side is turned on, and accordingly,
When the output transistor T21 turns on, the drive signal output terminal
Sa becomes approximately the battery voltage + B, and the drive signal output terminal
A drive signal (current) is output from Sa to the igniter 10.
The power transistor T11 on the igniter 10 side is turned off.
And the primary winding of the ignition coil is energized.
In this state, the diode of the current outflow stop circuit 24
Since no current flows through the node D21, the current outflow stop circuit 2
4 control transistor T24 and current draw transistor
T23 is turned off, and the drive signal lead-in terminal Sb is
It is kept open. On the other hand, the output from the engine control unit 50 is
The ignition control signal IG changes from high level to low level (gray level).
When the voltage falls to the ground potential), the current outflow stop circuit 24
A forward current flows through the diode D21, and the resistors R27 and R2
Current also flows through 8. As a result, a current flows through the resistor R27.
Of the control transistor T24 caused by the
The control transistor T24 is turned on due to the decrease in the potential.
As a result, the current pull-in transistor T23 is turned on.
You. As a result, the drive signal lead-in terminal Sb is connected to the ground line.
Power transistor on the igniter 10 side
T11 is quickly turned off. In this state,
Control transistor T22 and output of current outflow circuit 22
The transistor T21 is also turned off, and the drive signal output terminal
The output of the drive signal (battery voltage + B) from the child Sa is also blocked.
Refused. The current outflow stop circuit 24 is provided with an engine control system.
The ignition control signal IG output from the control device 50 is at the high level.
When the signal falls to the low level (ground potential)
Then, the power transistor T11 is quickly turned off,
Immediately cut off the current flowing through the primary winding of the fire coil,
Steep rise of ignition high voltage generated on the secondary winding side
This current outflow stop circuit 24 is
Even if it is not provided, the operation of the current outflow circuit 22
Therefore, the power transistor T11 on the igniter 10 side
It can be turned off. Next, the power-on output stop circuit 30
The ignition switch is turned on, and the constant voltage power supply 60 is turned on.
After the operation, the constant voltage power supply 60 is operated for a predetermined period of time.
In response to the reset signal (Low level) output from the
During the reset signal input period.
Turn on the transistors T23 and T24 of the path 24
Therefore, the output of the drive signal to the igniter 10 is stopped.
It is. The reset signal is output from the constant voltage power supply 60.
Starts generating DC constant voltage Vcc in response to battery voltage + B
After that, the voltage Vcc becomes stable and the engine control
The power is turned on for a predetermined time until the device 50 starts normal operation.
To operate the input / output stop circuit 30;
The constant voltage power supply 60 is turned on after the power is turned on (ignition switch).
Reset signal) until the specified time elapses.
Signal output terminal at low level, and then
To stop reset signal output
Have been to be. The power-on output stop circuit 30
Is connected to the power supply line LC from the constant voltage power supply 60.
Connected to the power supply line L via the resistor R31.
C and a constant voltage power supply via a resistor R32.
A PNP input connected to the reset signal output terminal 60
The force transistor T31 and the base are connected via a resistor R33.
Connected to the collector of the input transistor T31
To ground via a resistor R34.
The emitter is connected to the ground line and the collector is
Connects to the cathode of the diode D22 in the outflow stop circuit 24.
And a continuous NPN output transistor T32.
Have been. In the current outflow stop circuit 24, the
The anode of the diode D22 is connected to the diode D21 and the resistor R2.
8 is connected to the connection point. Therefore, the power supply output stop circuit 30
And a reset signal (Low level) from the constant voltage power supply 60
Is output, the input transistor T31 and the output
When both the force transistors T32 are turned on, the current
The cathode of the diode D22 in the output stop circuit 24 is output.
Ground to ground line via force transistor T32
On the contrary, the reset signal is not output from the constant voltage power supply 60.
The input transistor T31 and the output transistor
Both the transistors T32 are turned off, and the current outflow stop circuit 2
The cathode of the diode D22 in 4 is opened. Therefore, the reset signal (Lo
w level) is being output while the current in the output circuit 20 is
In the outflow stop circuit 24, the operation of the current outflow circuit 22 (in other words,
The current control regardless of the ignition control signal IG state).
Transistor T23 turns on and drives the igniter 10.
Output signal will be forcibly stopped.
You. Next, a voltage abnormality output stop circuit 40
Is connected to the cathode via a current limiting resistor R41.
Connected to the power supply line LB from the battery
The input transistor T31 of the output stop circuit 30
A Zener diode ZD0 connected to the
Connected to the power supply line LC from the constant voltage power supply 60.
The anode is connected to the input
Diode D4 connected to the collector of transistor T31
And 1. For this reason, the output stop circuit 40 for abnormal voltage
The battery voltage + B is the Zener diode ZD
If the voltage exceeds a predetermined voltage determined by the breakdown voltage of 0, the battery
The power supply output stop circuit 3
0 to the base of the output transistor T32,
A current flows through the diode ZD0 and the output transistor
T32 will be turned on. That is, the output stop circuit 40 for abnormal voltage is
Output for forcibly operating the current outflow stop circuit 24
The transistor T32 is connected to the power-on output stop circuit 30.
The battery power that is shared and supplied via the power supply line LB
+ B is determined by the breakdown voltage of Zener diode ZD0
When the voltage exceeds a predetermined voltage, the output transistor T32 is turned on.
By doing so, the current pull-in
Forcibly turn on transistor T23 and igniter 10
The output of the drive signal is stopped. In the output stop circuit 40 for abnormal voltage,
Therefore, the diode D41 is connected to the output transistor T32.
The upper limit of the source side potential is set to the DC constant voltage Vc of the power line LC.
Limited to voltage obtained by adding forward voltage drop of diode to c
Power supply line LB of the power supply line.
Output transistor via the Zener diode ZD0
The overflow of the current flowing into the base side of T32
It flows to the power supply line LC side and is provided on the power supply line LC.
The capacitor C61 for voltage stabilization is charged. Also,
The voltage power supply 60 is connected to a power supply line LB from the battery and a direct current.
A power supply provided between the power supply line LC and the constant voltage Vcc.
Power transistor (emitter is connected to power line LB,
Transistor with PNP transistor connected to power line LC
By controlling the base current of the power supply line L
The voltage of C is controlled to a constant voltage (DC constant voltage Vcc).
It is. As described in detail above, the conventional igniter system
The control device uses a Zener diode ZD0 to
When the battery voltage + B is abnormal (high voltage), the output circuit 20
Stops output of drive signal to igniter 10 forcibly
The output stop circuit 40 at the time of abnormal voltage was provided.
And the conventional igniter control device
By mounting the circuit elements that make up each of the above circuits,
Had been formed. [0028] However, in recent years,
Request to ECU (Electronic Control Unit) for engine control
Due to increased specifications and restrictions on board size,
The igniter control device is expected to be downsized.
You. In order to reduce the size of the above-mentioned igniter control device,
Can be integrated into an IC as a single semiconductor integrated circuit.
However, the conventional igniter control device
Force stop circuit 40 is composed of Zener diode ZD0
The igniter control device described above
Function cannot be provided in one IC.
As for the zener diode ZD0, as a separate part, E
It had to be separately mounted on the CU substrate. That is, the Zener diode ZD0 is
Battery voltage + B is twice or more than normal (for example, 12V)
When the above set voltage (for example, 27V) is exceeded, conduction occurs.
From the power supply line LB on the battery side,
Because the current must flow into the
Must be increased.
A diode is implemented as a chip component to be incorporated into an IC.
Not revealed. Therefore, the igniter system shown in FIG.
To make the control device IC, at least Zener diode
Only ZD0 needs to be connected externally,
There is a limit to miniaturization of the data controller. The Zener diode ZD0 is connected to a semiconductor
In order to incorporate the Zener diode ZD0 into the integrated circuit,
Diode with small breakdown voltage that can be integrated into an IC
Are connected by cascade connection.
It is also possible to get the desired breakdown voltage in the body
However, in this case, the breakdown voltage of the entire cascade circuit
Fluctuations are caused by variations in the characteristics of individual Zener diodes.
, The variation in breakdown voltage is large.
Normal operation as output stop circuit when voltage is abnormal
You will not be able to do it. Therefore, Zener Dio
A large number of Zener diodes that can be integrated into ICs
The igniter control system
You can't even convert your body into an IC. The present invention has been made in view of these problems.
When the battery voltage is abnormal, drive the igniter
An igniter control device having a function of stopping signal output
All the electronic components that make up the device
It is intended to be able to be incorporated in an integrated circuit. [0032] In order to achieve the above object,
In the igniter control device according to the first aspect,
Output of drive signal from output circuit when battery voltage is abnormal
Output stop circuit forcibly stops the first voltage divider circuit
By dividing the output voltage from the constant voltage power supply
In addition to generating the normal judgment voltage, the battery is
By dividing the output voltage from the
Is generated by the comparator circuit.
The output from each voltage divider circuit is compared, and the voltage to be determined is determined to be abnormal.
Output of drive signal from output circuit when higher than voltage
To stop. That is, the igniter control device of the present invention
The output stop circuit can be replaced with a Zener diode
Instead of using two voltage dividers and comparison circuits.
Igniter control device
All the electronic components that make up each circuit in a semiconductor integrated circuit
So that they can be integrated into one semiconductor
It is built into an integrated circuit. For this reason, according to the present invention, the conventional IC
Convert the difficult igniter control device into an IC
Control device (and engine control in which it is incorporated)
) Can be reduced in size. Also book
In the invention, the output voltage from the constant voltage power supply is divided to determine
By generating a constant voltage, the battery
Voltage value that is always stable without being affected by
And compares it with the determined voltage corresponding to the battery voltage.
Output when the voltage to be determined is higher than the
Since the output of the drive signal from the power circuit is stopped,
Battery when the power stop circuit stops the output of the drive signal
Voltage abnormality determination can always be performed stably. Yo
Thus, according to the present invention, for example, the igniter operates normally.
Drive signal to the igniter within the range of battery voltage
Signal output, adversely affecting igniter operation
Only under conditions, output of the drive signal to the igniter is stopped.
You can also do. [0035]The output circuit isOn the positive side of the battery
Power supply line connected and control terminal of power transistor
Drive switch provided in the drive current output path between
The ignition element according to the ignition control signal from the engine control unit.
Power transistor by turning it on and off.
Configuration so that drive current flows out to the control terminalWas doneElectric
In addition to the flow outflow circuit, a
Drive line and the control terminal of the power transistor.
Switching element for current drawing provided in dynamic current drawing path
The current that turns on and off the element in the opposite phase to the current outflow circuit
Outflow stop circuitHave.The power transistor
The control terminal means that the power transistor is a bipolar transistor.
If it is a transistor, it is the base of the transistor.
The power transistor is an electric field effect
If it is a transistor, it is the gate of that transistor.
You. AndOutput stop circuit (For details,
Circuit), the voltage to be determined is abnormalIf higher than voltage
The switching element for driving the current outflow circuit
Turn off or draw current in current outage stop circuit
By forcibly turning on the switching element,
Stop the output of the drive signal from the power circuitYou. [0037]Therefore, according to the present invention, the output circuit
Compared to the case where only the current outflow circuit is
When the output of the ignition control signal from the
Turn on the power transistor on the nighter more quickly.
The current rise in the secondary winding of the ignition coil suddenly.
It becomes possible to make it steep. In addition,Output stop circuit (details
In other words, the comparison circuit)The voltage to be determined is higher than the abnormality determination voltage.
If high, the switching element for driving the current
At the same time as forcibly turning off the current
So that the pull-in switching element is forcibly turned onStructure
SuccessYou may. [0038] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
They will be explained together. FIG. 1 shows an igniter control device according to the present embodiment.
FIG. 3 is an electric circuit diagram illustrating the configuration of FIG. The igniter shown in FIG.
The control device is built in one semiconductor integrated circuit,
The circuit block is illustrated in FIG.
Each cylinder of the engine was grouped like the conventional device
It is provided corresponding to the igniter 10 for each cylinder group.
Output circuit 20 (two in the figure)
Output stop circuit 30 and output stop circuit 40 for abnormal voltage.
It is composed of The difference from the conventional apparatus of FIG.
Overall configuration of output stop circuit 40 at abnormal pressure and output circuit 20
Of the current outflow circuit 22 in FIG.
The configuration is exactly the same as the above-described conventional device.
Therefore, in the following description, the output stop circuit 40 for abnormal voltage
Configuration and current outflow circuit 22 are different from the conventional device.
Only the details are described in detail, and other configurations (for details,
, The current outflow stop circuit 24 in the output circuit 20,
Power-off output stop circuit 30, engine consisting of microcomputer
Connection between control device 50 and igniter control device, constant current
Voltage circuit (power supply IC) 60 and its peripheral circuits and each power supply line.
The connection state with the LB and LC) is shown in FIG.
The same reference numerals as in the conventional apparatus of FIG.
I do. As shown in FIG. 1, the output of this embodiment at the time of abnormal voltage
The power stop circuit 40 has one end connected to the power line LB on the battery side.
Battery voltage via an external resistor R41 connected to
+ B is configured to be loaded, and the loaded
The battery voltage + B is divided by a voltage dividing resistor as a second voltage dividing circuit.
By dividing the resistance via R42 and R43,
A voltage to be determined corresponding to the battery voltage + B is generated. The resistors R42 and R43 are externally connected.
Between the terminal to which the resistor R41 is connected and the ground line
The resistor R42 connected in series with the power supply line LB.
And the voltage at the connection point between the ground line side resistor R43 and
It is generated as the voltage to be determined Vb. Therefore, in this embodiment,
Indicates that the voltage to be determined Vb is the resistance of each of these resistors R42 and R43.
And the divided voltage value determined by the resistance value of the external resistor R41
Is a voltage obtained by dividing the battery voltage + B (Vb = + B × R
43 / (R41 + R42 + R43)) and its partial pressure
The value is adjusted by adjusting the resistance of the external resistor R41.
Can be set freely. The power supply line LC on the side of the constant voltage power supply 60
Is connected to one end of a resistor R44.
Is grounded to the ground line via a resistor R45.
Have been. These resistors R44 and R45 are connected to a power supply line.
Divides the DC constant voltage Vcc between the LC and ground lines
Thus, the resistance value of each of these resistors R44 and R45 is
Fixed abnormality determination voltage Vth (Vth = Vcc × R
45 / (R44 + R45)
Thus, it functions as the above-mentioned first voltage dividing circuit. In addition, this abnormality
The determination voltage Vth is equal to the normal battery voltage + B (for example, 1
Abnormal voltage higher than 2 V) (for example, about 24 V to 27 V)
Degrees). And each of these
The determined voltage Vb and the abnormality determining voltage divided by the voltage dividing circuit
The voltage Vth is applied to a comparison circuit (a so-called comparator) CMP.
Input to each other, and the magnitude ratio of each voltage in the comparison circuit CMP.
A comparison is made. Here, the comparison circuit CMP operates on the battery side.
It operates by receiving power supply from the power supply line LB.
The non-inverting input terminal (+) has an abnormality determination voltage Vth
And the inverting input terminal (−) receives the determined voltage Vb, respectively.
Then, the magnitude of each of these voltages is determined. For this reason,
When the voltage Vb is higher than the abnormality determination voltage Vth,
An unillustrated audio device provided at an output stage in the comparison circuit CMP.
The open collector output transistor turns on,
If the determined voltage Vb is equal to or lower than the abnormality determination voltage Vth
Thus, the output transistor is turned off. And this
The output terminal of the comparison circuit CMP is an output stop circuit at power-on.
30 as well as the collector of the output transistor T32
Diode D22 in current outflow stop circuit 24 of circuit 20
And the connection point is connected to a resistor R
The power supply line LC is connected via 46. For this reason, the output of the present embodiment is stopped when the voltage is abnormal.
According to the circuit 40, as shown in FIG.
Is equal to or lower than the abnormality determination voltage Vth,
The output becomes open and the current outflow stop circuit 24
To the cathode of the diode D22 through a resistor R46.
To apply the DC constant voltage Vcc,
Operation is stopped, but the battery voltage + B
Exceeds a predetermined voltage (for example, 25 V) specified by the voltage Vth.
When the determined voltage Vb exceeds the abnormality determination voltage Vth,
The comparison circuit CMP detects a diode in the current outflow stop circuit 24.
Grounding the cathode of the gate D22 to the ground line,
Strengthen the transistors T24 and T23 in the outflow stop circuit 24.
And turn on the output of the drive signal to the igniter 10.
(The output suspension period during abnormal voltage shown in FIG. 2
reference). The non-inverting input terminal of the comparison circuit CMP
The input line of the determined voltage Vb to (−) has a cathode
Is the diode D41 connected to the power line LC.
The diode D41 is connected by this diode D41.
As the battery voltage + B rises excessively, the comparison circuit CMP
Input voltage to the inverted input terminal (-) becomes abnormally high
Is prevented. On the other hand, in the current outflow circuit 22 of this embodiment,
In addition to the same circuit configuration as the conventional device shown in FIG.
The input terminal is a diode from the output terminal of the comparator CMP.
Invar connected to the signal path to the cathode of D22
To the output terminal of the inverter INV and the inverter INV.
And the collector is connected to the control transistor T22.
Connected to base, emitter connected to ground line
NPN transistor T26 is provided.
You. Therefore, in the current outflow circuit 22, a voltage difference
Constant output stop circuit 40 determines abnormality of battery voltage + B
Or the operation of the power-off output stop circuit 30
Therefore, when the current outflow stop circuit 24 starts operating
(Specifically, the transistors T24 and T23 are turned on.
The transistor T26 is turned on.
The ignition control signal IG from the engine control device 50
However, the control transistor T22 is forcibly turned off.
Drive signal from the current outflow circuit 22 to the igniter 10
Will also be stopped. Therefore, in the igniter control device of this embodiment,
As in the conventional device shown in FIG.
When the battery voltage + B is abnormal, the current outflow circuit 22 and the current flow
The output stop circuit operates together with the power supply line on the battery side.
From the LB, the current outflow circuit 22 and the current outflow stop circuit 24
To prevent current from flowing to the ground line side
Wear. Therefore, when the igniter control device is integrated into an IC,
The ability to reduce power consumption and suppress heat generation in ICs
become. Further, the current outflow circuit 22 of the present embodiment
Flows current from the power supply line LB to the igniter 10.
The output transistor has a two-stage configuration. That is,
First-stage output transistor (PNP type transistor same as conventional device)
Transistor) The collector of T21 is a resistor R29 and a resistor.
Connected to the drive signal output terminal Sa via R30.
The connection point of these resistors R29 and R30 is the second stage.
N2 type transistor T2 which is an output transistor of
5 bases are connected. And this output transformer
The collector of the transistor T25 is connected to the power line L on the battery side.
B, and the emitter is connected to the drive signal output terminal Sa.
Has been continued. Therefore, in the current outflow circuit 22, the control
When the transistor T22 is turned on, each output transistor
The stars T21 and T25 are turned on, and the power supply line LB
The igniter 10 has a second-stage output transistor T
The current will flow out through 26. As described above, the ignition of the present embodiment
According to the data control device, the output stop circuit 40 for abnormal voltage
With a Zener diode like a conventional device,
And the abnormal voltage Vb using the comparison circuit CMP
Abnormality of battery voltage + B by comparison with constant voltage Vth
Is determined, the output circuit 20 sends the signal to the igniter 10.
The drive signal output is forcibly stopped.
As a result, the ignition
Iter control unit without using Zener diode
The igniter control device can be easily integrated into an IC.
Can be. Therefore, according to the present embodiment, the igniter system
The control device is downsized and assembled in the ECU for engine control.
The size of the ECU can be reduced. The embodiment of the present invention has been described above.
However, the present invention is not limited to the above examples,
Various embodiments can be adopted. For example, in the above embodiment,
Is the same as the conventional device shown in FIG.
A similar power-on output stop circuit 30 is provided.
However, according to the igniter control device of the present embodiment,
It is necessary to provide the output stop circuit 30 at power-on
However, as shown in FIG.
May be deleted. That is, the power-on output stop circuit 30
According to the reset signal from the voltage power supply 60, the ignition
Output circuit 2 for a predetermined time after the switch is turned on.
By forcibly stopping the output of the drive signal from 0
As a result, the DC constant voltage generated by the constant voltage power supply 60 becomes stable.
Between the time when the engine control device 50 operates normally.
Prevents accidental output of drive signal to igniter 10
Is what you do. On the other hand, in this embodiment, when the voltage is abnormal,
The output stop circuit 40 is connected to the
The abnormality determination voltage Vth generated at the constant flow voltage Vcc and the
And the voltage to be determined Vb corresponding to the battery voltage + B is compared.
When the determined voltage Vb is higher than the abnormality determination voltage Vt,
The output of the drive signal from the output circuit 20 is stopped
As shown in FIG. 2, when the voltage is abnormal,
The output stop circuit 40 turns on the ignition switch.
And the battery voltage + B on the power supply line LB rises
Immediately after the constant voltage power supply 60 starts operating,
Until the voltage Vcc reaches the predetermined voltage Vc1 (see FIG.
During the period T, the abnormality determination voltage Vth becomes equal to the determined voltage Vb.
Igniter 10 during the period ΔT.
The output of the drive signal to is forcibly stopped. Therefore, the igniter control device of the above embodiment
In this case, the output stop circuit 40 for abnormal voltage
It also functions as the stop circuit 30, and when power is turned on.
Even if the output stop circuit 30 is deleted, the ignition switch
Igniter 10 for a predetermined period ΔT after the switch is turned on.
Output of the drive signal to the
Become like The output suspension period ΔT is a constant voltage power supply.
Rise characteristics of DC constant voltage Vcc output from the power supply 60
This rise characteristic depends on the constant voltage power supply 6
0 (power supply IC) and power supply line LC
Of capacitor C61 for voltage stabilization provided in
Is determined by the rise characteristics
Is only the abnormal voltage output stop circuit 40 of the above embodiment,
After turning on the power, until the engine control device 50 operates normally
Of the drive signal from the output circuit 20 to the igniter 10 during
It is also conceivable that the output cannot be stopped. Therefore, in such a case, the dotted line in FIG.
, A voltage dividing resistor for generating the abnormality determination voltage Vth
Of the R44 and R45, the resistor R45 on the ground line side
A capacitor C41 is provided in parallel.
4, Rise of abnormality determination voltage Vth generated by R45
The barring characteristics are adjusted by the capacitance of the capacitor C41.
What should I do?

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electric circuit diagram showing a configuration of an igniter control device according to an embodiment. FIG. 2 is a time chart showing the operation of the output stop circuit when the voltage is abnormal. FIG. 3 is an electric circuit diagram illustrating another configuration example of the igniter control device. FIG. 4 is an electric circuit diagram showing a configuration of a conventional igniter control device. DESCRIPTION OF SYMBOLS 10 ... igniter, 20 ... output circuit, 22 ... current outflow circuit, 24 ... current outflow stop circuit, 30 ... power-off output stop circuit, 40 ... voltage abnormal output stop circuit, 50 ... engine control device (Microcomputer), 60 ... constant voltage power supply (power supply I
C), CMP: comparison circuit, R42, R43, R44, R
45... Resistors (first voltage dividing circuit, second voltage dividing circuit), LB, L
C: Power supply line.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02P 3/04 F02P 3/055 F02P 11/00 F02P 15/00

Claims (1)

(57) [Claim 1] A drive signal is supplied to a power transistor of an igniter for switching between energization and non-energization from a battery to a primary winding of an ignition coil according to an ignition control signal from an engine control device. An output circuit for outputting and turning on the power transistor; and an output stop circuit for forcibly stopping the output of the drive signal from the output circuit when the output voltage from the battery exceeds a preset abnormality determination voltage. An igniter control device comprising: a power supply line connected to a positive electrode side of the battery;
The driving switching element provided to the drive current output path between the control terminal of the word transistor, a current outflow circuit for turning on and off in accordance with the ignition control signal from the engine control device, the anode side and the same potential of the battery Ground line and the
A current drawing switching element provided in a drive current drawing path between the power transistor control terminal and a control terminal of the power transistor according to an ignition control signal output from the engine control device.
A current outflow stop circuit that turns on and off in an opposite phase to the current outflow circuit , wherein the output stop circuit separates an output voltage from a constant voltage power supply that receives power supply from the battery and generates a constant voltage. A first voltage dividing circuit that generates the abnormality determination voltage by applying a voltage; a second voltage dividing circuit that divides an output voltage from the battery to generate a voltage to be determined corresponding to the output voltage; Comparing the output from the circuit, and when the determined voltage is higher than the abnormality determination voltage, the current outflow circuit
Forcibly turn off the drive switching element of
There is, by forcibly turning on the current drawing switching element before Symbol current drain stop circuit, a comparison circuit for stopping the output of the drive signal from the output circuit, by forming from said output circuit An igniter control device wherein the output stop circuit is incorporated in one semiconductor integrated circuit.