JPH06299944A - Deterioration detecting device for element - Google Patents

Abstract

PURPOSE:To detect a deterioration due to reduction in insulating resistance for a discharge ignition condenser in an early time. CONSTITUTION:A discharge ignition condenser 11 and a charge amount detecting condenser 22 are charged/discharged at the same time, and then, a detecting circuit 27 compares a voltage of the charge amount detecting condenser 22 after the discharge with the reference voltage. When an insulating resistance of the discharge ignition condenser 11 is reduced, a charge amount is lowered previously by an internal discharge, so that the discharge of the discharge amount detecting condenser 22 is cut off when the charge amount of the discharge ignition condenser 11 is discharged, and then, the voltage becomes the reference voltage or more because the charge is left, and consequently, an ECU 5 determines deterioration. When the insulating resistance of the discharge ignition condenser 11 is lowered even by a little, reduction in the insulating resistance can be detected in an early time, as a charge is left in the discharge detecting condenser 22 after the discharge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting deterioration of an element, which is used for a capacitor which charges and discharges with the accumulation and discharge of electric charges when a voltage is applied, a PZT element which performs expansion and contraction, and the like. The present invention relates to a deterioration detecting device that detects deterioration due to deterioration.

[0002]

2. Description of the Related Art As a conventional deterioration detecting device of this type,
The thing which detects deterioration of the capacitor for discharge ignition with which the capacity discharge type ignition device of an internal combustion engine was equipped can be mentioned. This discharge ignition capacitor is charged by the direct current from the battery during the operation of the ignition device, and plays a role of energizing the ignition coil with the discharge and igniting. Defects frequently occur and the catalyst may be damaged by the discharge of raw gas. Therefore, the deterioration detecting device compares the charging voltage of the capacitor with a preset reference voltage, and when the charging voltage falls below the reference voltage by the time of discharging, considers that the insulation resistance of the capacitor has decreased. Deterioration is judged and measures such as stopping fuel injection are taken to prevent catalyst damage.

[0003]

By the way, when the fuel injection is stopped as described above, the vehicle suddenly becomes unable to run on the road. Therefore, it is desired to notify the driver in advance by a warning light or the like in advance. Has been done. However, since the charging voltage of the capacitor does not fall below the reference voltage unless the insulation resistance is considerably reduced, it is not possible to make an early determination of deterioration, and thus it is not possible to satisfy the above demand.

Therefore, the present invention provides a device for detecting deterioration of an element, such as a capacitor for discharge ignition, which can detect deterioration due to a decrease in insulation resistance at an early stage, and an ignition device for an internal combustion engine equipped with the device. The challenge is to provide.

[0005]

According to a first aspect of the present invention, there is provided a device for detecting deterioration of an element, which is connected to a detected element which performs charge accumulation and discharge operations by applying a voltage, and which accompanies charge accumulation of the detected element. The voltage of the charge amount detection capacitor, which is charged and discharged as the charge is discharged, is compared with the voltage of the charge amount detection capacitor after discharge and a preset reference voltage. When the above is the case, it is provided with a deterioration judging means for judging deterioration of the detected element and a reset circuit for grounding the charge amount detecting capacitor after deterioration judgment.

According to a second aspect of the present invention, there is provided a device for detecting deterioration of an element, which comprises a charging circuit for boosting a current supplied from a DC power source to charge a discharge ignition capacitor, and an ignition accompanying discharge of the discharge ignition capacitor. A discharge circuit for energizing a coil, a charge amount detection capacitor connected to the discharge ignition capacitor and charged and discharged together with the discharge ignition capacitor, a voltage of the charge amount detection capacitor after discharge, and a preset reference voltage When the voltage of the charge amount detecting capacitor is equal to or higher than a reference voltage, the deterioration determining means for determining the deterioration of the discharge ignition capacitor and the reset circuit for grounding the charge amount detecting capacitor after the deterioration determination are compared. And is equipped with.

[0007]

According to the invention of claim 1, the charge amount detecting capacitor is charged and discharged in accordance with the charge accumulation and discharge operations of the detected element, and the voltage after the discharge is compared with the reference voltage by the deterioration determining means. . Here, when the amount of charge equal to that of the detected element is accumulated in the charge amount detecting capacitor during charging and the insulation resistance of the detected element does not decrease, the amount of charge is increased as the detected element discharges charge. The detection capacitor is completely discharged.

However, when the insulation resistance of the element to be detected is lowered, the charge amount of the element to be detected is reduced in advance by the internal discharge. The discharge of the amount detection capacitor is interrupted, and the charge remains in the charge amount detection capacitor even after the discharge. Therefore, at this time, the deterioration determination unit determines that the voltage of the charge amount detection capacitor is equal to or higher than the reference voltage, and then the deterioration determination is performed. Then, the reset amount circuit grounds the charge amount detection capacitor to discharge the remaining charge. It As described above, even if the insulation resistance of the detection target element is reduced even slightly, the electric charge remains in the charge amount detection capacitor after discharging, so that the reduction of the insulation resistance can be detected early.

According to the second aspect of the present invention, each time the ignition device is ignited, the current supplied from the DC power source is boosted by the charging circuit to charge the discharge ignition capacitor, and the discharge ignition capacitor is discharged. The ignition coil is energized to ignite the spark plug. The charge ignition capacitor is charged and discharged together with the discharge ignition capacitor, and the voltage after the discharge is compared with the reference voltage by the deterioration determining means. Here, the same charge amount as the discharge ignition capacitor is accumulated in the charge amount detection capacitor during charging, and if the insulation resistance of the discharge ignition capacitor does not decrease, the charge is discharged along with the discharge ignition capacitor. As a result, the charge detecting capacitor is completely discharged.

However, when the insulation resistance of the discharge ignition capacitor is lowered, the charge amount of the discharge ignition capacitor is lowered in advance by the internal discharge.
When the charge amount of the discharge ignition capacitor is discharged, the discharge of the charge amount detecting capacitor is interrupted, and the charge remains in the charge amount detecting capacitor even after the discharge. Therefore,
At this time, the deterioration determination unit determines that the voltage of the charge amount detection capacitor is equal to or higher than the reference voltage, and makes a deterioration determination.
After that, the charge detecting capacitor is grounded by the reset circuit, and the remaining charges are discharged. As described above, if the insulation resistance of the discharge ignition capacitor is reduced even slightly, the charge remains in the charge amount detection capacitor after discharge, so the insulation resistance is reduced early, that is, ignition failure does not occur frequently. It can be detected when the vehicle can be continuously driven.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in an ignition device for an internal combustion engine equipped with a deterioration detecting device for detecting deterioration of a discharge ignition capacitor will be described below.

FIG. 1 is an electric circuit diagram showing an internal combustion engine ignition device according to an embodiment of the present invention, and FIG. 2 is an electric circuit diagram showing a deterioration detection device for an internal combustion engine ignition device according to an embodiment of the present invention. Is.

First, the overall structure of the ignition device will be described with reference to FIG. 1. The minus side of the on-vehicle battery 1 is grounded, and the plus side of the on-vehicle battery 1 is connected through the ignition switch 2 to one end of the primary coil 3a of the boosting coil 3. It is connected to the.
The other end of the primary coil 3a is connected to the collector of the first power transistor 4, the emitter of the first power transistor 4 is grounded, and the base is an electronic control unit (hereinafter,
(Referred to simply as “ECU”) 5. This first
The power transistor 4 of the ignition signal IG from the ECU 5
It is turned on at the rising edge of t to energize the primary coil 3a of the boosting coil 3. Secondary coil 3b of boosting coil 3
Is grounded and the other end is connected to one end of the primary coil 7a of the ignition coil 7 through the first diode 6 in the forward direction.

One end of the primary coil 7a of the ignition coil 7 is connected to the other end through the second diode 8 in the reverse direction.
The other end of the next coil 7a is connected to the anode of the SCR 9. The cathode of SCR9 is grounded, and the gate is ECU
Connected to 5. The SCR 9 is turned on at the rising edge of the ignition signal IGt from the ECU 5 to energize the primary coil 7a of the ignition coil 7. One end of the secondary coil 7b of the ignition coil 7 is grounded, and the other end is connected to a spark plug 10 of an internal combustion engine (not shown). Further, one end of a discharge ignition capacitor 11 is connected between the cathode of the first diode 6 and the cathode of the second diode 8.

Next, the structure of the deterioration detecting device 21 according to the gist of the present invention will be described with reference to FIGS. One end of the charge amount detecting capacitor 22 of the deterioration detecting device 21 is connected to the other end of the discharge ignition capacitor 11, and the other end of the charge amount detecting capacitor 22 is grounded. One end of the charge amount detecting capacitor 22 is grounded via the third diode 23 in the reverse direction, and the collector of the second power transistor 25 of the reset pulse generating circuit 24 is connected. The emitter of the second power transistor 25 is grounded, the base is connected to the monostable circuit 26, and the monostable circuit 26 outputs the ignition signal IG from the ECU 5.
The reset signal Vrs is output in synchronization with the fall of t,
The second power transistor 25 is turned on for several hundred μsec.

The deterioration detecting device 21 is provided with a detecting circuit 27, the voltage V1 of the discharge ignition capacitor 11 is applied to the non-inverting input terminal of the first comparator 28 of the detecting circuit 27, and the reference voltage is applied to the inverting input terminal. Voltage Vref1 is applied,
The output voltage IGf of the first comparator 28 is the ECU
Input to 5. Further, the voltage V2 of the charge amount detecting capacitor 22 is applied to the non-inverting input terminal of the second comparator 29 of the detection circuit 27, and the reference voltage Vref2 is applied to the inverting input terminal of the second comparator 29. The output voltage Vcp is input to one input terminal of the AND circuit 30. The ignition signal IGt from the ECU 5 is applied to the other input terminal of the AND circuit 30, and the output terminal of the AND circuit 30 is connected to the input S of the flip-flop 31. The ignition signal IG is input to the input R of the flip-flop 31.
t is inverted and input by the inverter 32, and the output Q of the flip-flop 31 is input to the ECU 5.

Next, the operation of the internal combustion engine ignition device configured as described above, particularly the operation of the deterioration detecting device 21, will be described.

FIG. 3 is a time chart showing each signal of the internal combustion engine ignition device according to one embodiment of the present invention, and FIG. 4 is the electric charge when the capacitor of the internal combustion engine ignition device according to one embodiment of the present invention is discharged. It is a schematic electric circuit diagram for demonstrating the imbalance of quantity.

The ignition device of the present embodiment operates in the same manner as a general capacity discharge type ignition device. First, its outline will be described. E
The first power transistor 4 is turned on at the rise of the ignition signal IGt output from the CU 5, and when the current exceeds a predetermined value, the first power transistor 4 is turned off. As shown in FIG. The boosted current from the battery 1 charges the discharge ignition capacitor 11 and the charge amount detection capacitor 22. Both charged capacitors 1
1 and 22 are SC when the ignition signal IGt of the next cycle rises.
When R9 is turned on, discharge is started, the current flows into the primary coil 7a of the ignition coil 7, the ignition plug 10 is ignited, and this operation is repeated thereafter.

Next, the discharge ignition capacitor 11 described above.
Also, the operation of the deterioration detecting device 21 performed when the charge amount detecting capacitor 22 is charged will be described. First, the transition of the charge amount of both capacitors 11 and 22 will be described based on FIG. 4. In the figure, the switch SW1 assumes the first power transistor 4, and the switch SW2 assumes the SCR9. In addition, the switch SW3 is both capacitors 1
It is provided to intentionally break the balance of the charge amounts of 1 and 22, and it is assumed that all the switches SW1 to SW3 are opened in the initial state. The resistors R1 and R2 connected in series to the switch SW2 and the switch SW3 are for consuming the currents I2 and I3 when the capacitors 11 and 22 are discharged.

When the switch SW1 is closed,
The discharge ignition capacitor 11 is charged to the voltage V1 and the charge amount detecting capacitor 22 is charged to the voltage V2 by the current I1 from the battery 1. Here, the charge amount Q1 stored in the discharge ignition capacitor 11 and the charge amount Q2 stored in the charge amount detecting capacitor 22 are as follows: Q1 = C1.V1 ... (1) Q2 = C2.V2. ... (2), and Q1 = Q2 ... (3). C1 is the electrostatic capacitance of the discharge ignition capacitor 11, C2 is the electrostatic capacitance of the charge amount detecting capacitor 22, and in this embodiment, the electrostatic capacitance C2 of the charge amount detecting capacitor 22 is the discharge ignition capacitor 11 The voltage V2 at the time of charging is remarkably smaller than the voltage V1 because it is set to be extremely large as compared with the electrostatic capacity C1.

If it is assumed that the insulation resistance of the discharge ignition capacitor 11 is not lowered, it is assumed that the voltage V of the capacitors 11 and 22 is V after the switch SW1 is closed.
1, 1 and V2 do not decrease, and the charge amounts Q1 and Q2 are held at the initial equal values. Therefore, then switch SW2
When the capacitors 11 and 22 are discharged due to the current I2 flowing through the resistor R1 when the capacitors are closed, the charge amounts Q1 and Q
2 decreases to 0 at the same time, and the voltages V1 and V2 decrease accordingly to 0 (point a in FIG. 3).

Further, if it is an abnormal time when the insulation resistance of the discharge ignition capacitor 11 is lowered, the charge amount stored in the discharge ignition capacitor 11 is internally discharged, so that the charge amount Q1 is Charge amount detecting capacitor 22
Of the electric charge Q2, and the voltage V1 gradually decreases as shown by the broken line in FIG. This phenomenon corresponds to the case where the switch SW3 is closed for a short time in FIG. 4, and while the switch SW3 remains closed, the current I3 flows through the resistor R2 and the discharge ignition capacitor 11 is discharged. The voltage V1 is reduced as the charge amount Q1 is reduced. Therefore, when the switch SW2 is subsequently closed, the discharge is interrupted when the charge amount Q1 of the discharge ignition capacitor 11 decreases to 0, and the voltage V1 of the discharge ignition capacitor 11 becomes 0.
In addition, the capacitor 22 for detecting the charge amount has a residual charge amount Q2.
To a predetermined voltage V2 (immediately after point a in FIG. 3). That is, the voltage V2 of the charge amount detecting capacitor 22 at this time has a value proportional to the degree of decrease in the insulation resistance of the discharge ignition capacitor 11.

Although the energy charged in the discharge ignition capacitor 11 is reduced by providing the charge amount detecting capacitor 22, the capacitance C2 of the charge amount detecting capacitor 22 is the discharge ignition capacitor as described above. Since it is much larger than the capacitance C1 of 11, the amount of energy reduction is very small and there is no possibility of impairing the actual ignition function.

As described above, the discharge ignition capacitor 11
The voltage V2 of the discharged charge amount detecting capacitor 22 changes depending on whether or not the insulation resistance of the capacitor has decreased. Therefore, in a normal state in which the insulation resistance of the discharge ignition capacitor 11 is not lowered, the voltage V2 of the charge amount detecting capacitor 22 becomes lower than the reference voltage Vref2 at the point a in FIG. 3 and the output voltage of the second comparator 29. Vcp is “L”
Then, the output of the AND circuit 30 is input and the input S of the flip-flop 31 is held at "L". At this time, since the inverted ignition signal IGt is inputted and the input R of the flip-flop 31 is lowered to "L", "L"
The output Q held at is input to the ECU 5.

Further, in this normal state, the voltage V1 of the charged discharge ignition capacitor 11 does not fall below the reference voltage Vref1 until the time of discharge, so that the output voltage IGf of the first comparator 28 becomes equal to the ignition signal IGt at the point a. The output voltage IGf is lowered to "L" in synchronization with the rise.
Is input to the ECU 5.

On the other hand, when the insulation resistance of the discharge ignition capacitor 11 is lowered and an abnormality occurs, the voltage V2 of the charge amount detecting capacitor 22 does not fall below the reference voltage Vref2 even after the time point a in FIG. And the second comparator 29
Output voltage Vcp is held at "H", and the input S of the flip-flop 31 is raised to "H". Therefore, the “Q” output Q of the flip-flop 31 is input to the ECU 5. In this case, although the insulation resistance of the discharge ignition capacitor 11 is lowered, the ignition failure is not so frequent and the catalyst is not damaged. After that, when the ignition signal IGt falls to "L", the reset signal Vrs of the reset pulse generating circuit 24 rises to energize the second power transistor 25. As a result, the charge amount detecting capacitor 22 is grounded, and the voltage V2 drops to 0 along with the remaining charge amount Q2 and returns to the initial state before the start of charging. At this time, the third diode 23 prevents the charge amount detecting capacitor 22 from becoming a negative voltage.

When the insulation resistance of the discharge ignition capacitor 11 further decreases, the voltage V before the discharge is started.
1 is lower than the reference voltage Vref1, and the first comparator 28
Output voltage IGf is lowered to "L" before the ignition signal IGt at the point a rises, and the output voltage IGf is input to the ECU 5. In such a case, the insulation resistance of the discharge ignition capacitor 11 is lowered, frequent ignition failures occur, and the catalyst may be damaged.

Next, the processing of the ECU 5 for inputting the output Q and the output voltage IGf from the deterioration detecting device 21 as described above will be described.

FIG. 5 is a flow chart showing a deterioration determining routine executed by the ECU of the internal combustion engine ignition apparatus according to one embodiment of the present invention.

The routine shown in the figure is executed every predetermined time. Now, to explain a normal time when the insulation resistance of the discharge ignition capacitor 11 is not reduced, the ECU 5 executes step S1.
Then, it is determined whether or not the ignition signal IGt has just risen. If it is not immediately after the ignition signal IGt rises, the process proceeds to step S2.
Next, at step S2, it is determined whether or not the ignition signal IGt is just before the rise. If it is not immediately before the rise, this routine is once ended. When it is determined in step S1 that the ignition signal IGt has just risen, it is determined in step S3 whether the output Q of the flip-flop 31 is "H", and the output Q is "L". The routine ends after S2. When it is determined in step S2 that the ignition signal IGt is about to rise, the first comparator 28 is activated in step S4.
Output voltage IGf is determined to be "L", and output voltage I
Since Gf is "H", the routine ends.

When the insulation resistance of the discharge ignition capacitor 11 decreases from the normal state, the ECU 5 sets the output Q of the flip-flop 31 to "H" in step S3. The warning light (not shown) provided in the above is turned on, and then the routine ends through step S2. At this stage, ignition failure still does not occur frequently, so it is possible to continue driving the vehicle, and the driver promptly moves the vehicle to a repair shop etc. by turning on the warning light and takes appropriate measures such as replacement and repair of the ignition device. Can be implemented.

On the other hand, if the insulation resistance of the discharge ignition capacitor 11 is further reduced without taking appropriate measures in this way, the ECU 5 determines in step S4 the first comparator 11
Output voltage IGf becomes "L", the process proceeds to step S6, and the operation of the fuel injection device of the internal combustion engine (not shown) is stopped. Therefore, damage to the catalyst due to frequent occurrence of poor ignition can be prevented.

The voltage V2 of the charge detecting capacitor 22 can be used as a standard for the electrostatic capacitance C2 in addition to the standard for the insulation resistance of the discharge ignition capacitor 11 as described above. That is, as can be seen from the above equations (1) to (3), since there is a correlation between the electrostatic capacitance C1 of the discharge ignition capacitor 11 and the voltage V2 of the charge amount detecting capacitor 22, the charge amount is When the detection capacitor 22 is charged and the voltage V2 reaches its peak (point b in FIG. 3),
The electrostatic capacitance C2 of the discharge ignition capacitor 11 can be estimated from the voltage V2.

As described above, in this embodiment, the charge amount detecting capacitor 22 functions as the charge amount detecting capacitor, and the detecting circuit 27 and the step S as the deterioration determining means.
1, the ECU 5 when executing the processing of step S3, step S5, the reset pulse generating circuit 24 as the reset circuit, the battery 1, the ignition switch 2, the boosting coil 3 and the first power transistor 4 as the charging circuit, The first diode 6, the ignition coil 7, the second diode 8 and the SCR 9 each function as a discharge circuit.

As described above, the internal combustion engine ignition device according to the present embodiment is connected in series with the discharge ignition capacitor 11, and the charge amount detection capacitor 22 is charged and discharged together with the discharge ignition capacitor 11, and the charge amount after discharge. The voltage V2 of the detecting capacitor 22 is compared with a preset reference voltage Vref2. When the voltage V2 of the charge amount detecting capacitor 22 is equal to or higher than the reference voltage Vref2, the output Q of the flip-flop 31 is set to "H". The detection ignition circuit 27 that starts up and the discharge ignition capacitor 11 when the output Q of "H" is input
The ECU 5 includes the ECU 5 that makes the deterioration determination and turns on the warning lamp, and the reset pulse generation circuit 24 that grounds the charge amount detecting capacitor 11 after the deterioration determination.

Therefore, when the insulation resistance of the discharge ignition capacitor 11 is reduced, the charge amount is reduced in advance by the internal discharge. Therefore, when the charge amount of the discharge ignition capacitor 11 is discharged, the charge amount detection capacitor 22 is discharged. Is interrupted, and the electric charge remains in the charge amount detecting capacitor 22 even after the discharge, and the deterioration of the discharge ignition capacitor 11 is judged. Then, even if the insulation resistance of the discharge ignition capacitor 11 decreases in this way, electric charge remains in the charge amount detection capacitor 22 after discharge, so that the insulation resistance decreases early, that is, ignition failure still frequently occurs. It can be detected at a stage where the driving of the vehicle can be continued without doing so.

By the way, the above embodiment is embodied as the deterioration detecting device 21 for detecting the deterioration of the discharge ignition capacitor 11 provided in the ignition device for an internal combustion engine. The element to be detected for deterioration is not limited to the above, as long as the element that accumulates and discharges charges by applying a voltage and the amount of charges is reduced by internal discharge when the insulation resistance decreases, The type is not limited. Therefore, for example, the deterioration detecting device may be embodied as a PZT element that expands and contracts by applying a voltage.

[0039]

As described above, according to the device for detecting deterioration of an element of the first aspect of the invention, when the insulation resistance of the element to be detected decreases, the amount of charge is reduced in advance by internal discharge. When the charge amount is released, the discharge of the charge amount detecting capacitor is interrupted, and the charge remains in the charge amount detecting capacitor even after the discharge, and the deterioration of the detected element is determined. Then, even if the insulation resistance of the detection target element is decreased in this way, the electric charge remains in the charge amount detecting capacitor after discharging, so that the decrease in the insulation resistance can be detected at an early stage.

Further, according to the ignition device for an internal combustion engine of the second aspect of the present invention, when the insulation resistance of the discharge ignition capacitor decreases, the charge amount is reduced in advance by the internal discharge. Therefore, the charge amount of the discharge ignition capacitor is reduced. The discharge of the charge amount detecting capacitor is interrupted at the time of the discharge, and the charge remains in the charge amount detecting capacitor even after the discharge, and the deterioration of the discharge ignition capacitor is judged. Then, even if the insulation resistance of the discharge ignition capacitor is decreased in this way, the electric charge remains in the charge amount detection capacitor after discharge, so that the insulation resistance is reduced early, that is, ignition failure does not occur frequently. It can be detected when the vehicle can be continuously driven.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an internal combustion engine ignition device according to an embodiment of the present invention.

FIG. 2 is an electric circuit diagram showing a deterioration detecting device for an internal combustion engine ignition device according to an embodiment of the present invention.

FIG. 3 is a time chart showing signals of the internal combustion engine ignition device according to the embodiment of the present invention.

FIG. 4 is a schematic electric circuit diagram for explaining the imbalance of the charge amount during discharge of the capacitor of the internal combustion engine ignition device according to the embodiment of the present invention.

FIG. 5 is a flowchart showing a deterioration determination routine executed by the ECU of the internal combustion engine ignition apparatus according to the embodiment of the present invention.

[Explanation of symbols]

 1 Battery 2 Ignition Switch 3 Booster Coil 4 First Power Transistor 5 ECU 6 First Diode 7 Ignition Coil 8 Second Diode 9 SCR 11 Discharge Ignition Capacitor 22 Charge Detection Capacitor 24 Reset Pulse Generation Circuit 27 Detection circuit

Claims (2)

[Claims] 1. A detection element that is connected to a detection element that accumulates and discharges electric charge by applying a voltage and is charged by the detection element.
The discharged charge amount detecting capacitor is compared with the discharged charge amount detecting capacitor voltage and a preset reference voltage, and when the charge amount detecting capacitor voltage is equal to or higher than the reference voltage, the detection target is detected. An element deterioration detecting apparatus comprising: a deterioration judging means for judging deterioration of an element; and a reset circuit for grounding a charge amount detecting capacitor after the deterioration judgment. 2. A charging circuit for boosting a current supplied from a DC power source to charge a discharge ignition capacitor, a discharge circuit for energizing an ignition coil with discharge of the discharge ignition capacitor, and the discharge ignition capacitor. The voltage of the charge amount detection capacitor, which is connected to the capacitor and charges and discharges together with the discharge ignition capacitor, is compared with the voltage of the charge amount detection capacitor after discharge and the preset reference voltage. Is greater than or equal to a reference voltage, the internal combustion engine is provided with a deterioration determining means for determining that the discharge ignition capacitor is deteriorated, and a reset circuit for grounding the charge amount detecting capacitor after the deterioration determination. Ignition device.