JP2000220443A - Control device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for an internal combustion engine that can judge the malfunction of an electric heating type catalyst(EHC) or a power supply system with higher certainty. SOLUTION: The actual service power WEHC to be supplied to EHC from voltage VEHC and current IEHC detected by a voltage sensor and a current sensor is calculated (S71). Also, reference power to be supplied to EHC from generated voltage VEHCBASE of a main alternator and a resistance REHC of EHC to be calculated in accordance with the engine speed NE, is calculated (S74). The integrated value WEHCS of actual service power WEHC and integrated value WEHCBSS of reference power WEHCBS are calculated (S72, S75). The abnormality can be judged based on these values (S76-S81).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an internal combustion engine in which an electric heating type catalyst is provided in an exhaust system. The present invention relates to a control device having a function.

[0002]

2. Description of the Related Art At the time of a cold start of an internal combustion engine, it takes time to activate a catalyst for purifying exhaust gas. Therefore, the activation of the catalyst is accelerated by using an electrically heatable catalyst that can be electrically heated. That is being done. As a method for detecting such an abnormality of the electrically heated catalyst, for example, Japanese Patent Application Laid-Open No.
JP-A-324617 discloses that when it is determined that the current flowing through the electrically heated catalyst is larger than a predetermined value, it is determined that the electrically heated catalyst or the power supply system of the electrically heated catalyst is abnormal.

[0003]

However, in the above-mentioned conventional method, when the value of the current flowing through the electrically heated catalyst is smaller than a predetermined value, it is determined that the current is normal. Therefore, the current is normally supplied to the electrically heated catalyst. Undetermined abnormalities could not be determined.

The present invention has been made in view of this point, and an object of the present invention is to provide a control device for an internal combustion engine that can more reliably determine an abnormality in an electrically heated catalyst or its power supply system. I do.

[0005]

In order to achieve the above object, the present invention provides a control apparatus for an internal combustion engine provided with power supply means for supplying electric power to an electrically heated catalyst provided in an exhaust system of the internal combustion engine. Supply power detection means for detecting actual supply power supplied at the time of heating the electrically heated catalyst, reference power calculation means for calculating reference power to be supplied by the power supply means, and an output of the supply power detection means Abnormality determining means for determining abnormality of the electrically heated catalyst or the power supply means based on the output of the reference power calculation means.

According to this configuration, the actual supply power actually supplied when the electric heating catalyst is heated is detected, and the reference power to be supplied by the power supply means is calculated. Based on the above, the abnormality of the electrically heated catalyst or the power supply means is determined, so that not only the abnormality where the actual supplied power is larger than normal, but also the abnormality which is smaller than normal can be reliably determined.

The abnormality determination means calculates the actual supply power integrated value and the reference power integrated value by integrating the actual supply power and the reference power, and compares the actual supply power integrated value and the reference power integrated value. It is desirable to perform the above-described abnormality determination.

The result of the judgment by the abnormality judging means is stored in a non-volatile memory, and based on a plurality of the results of the judgment stored in the non-volatile memory, it is determined whether or not a fail-safe operation such as turning on a warning lamp is performed. It is good to judge.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of an internal combustion engine (hereinafter, referred to as an “engine”) and a control device therefor according to an embodiment of the present invention. A throttle valve 3 is arranged in the intake pipe 2 of the engine 1. . A throttle valve opening (θTH) sensor 4 is connected to the throttle valve 3.
The throttle valve opening sensor 4 outputs an electric signal corresponding to the opening of the throttle valve 3 and supplies it to an electronic control unit (hereinafter referred to as “ECU”) 5.

A fuel injection valve 6 is provided for each cylinder between the engine 1 and the throttle valve 3 and slightly upstream of an intake valve (not shown) of the intake pipe 2, and each injection valve is connected to a fuel pump (not shown). The ECU 5 is electrically connected to the ECU 5 and controls a valve opening time of the fuel injection valve 6 based on a signal from the ECU 5.

On the other hand, an intake pipe absolute pressure (PBA) sensor 7 is provided immediately downstream of the throttle valve 3, and the absolute pressure signal converted into an electric signal by the absolute pressure sensor 7 is supplied to the ECU 5. . Further, an intake air temperature (TA) sensor 8 is attached downstream thereof, detects the intake air temperature TA, outputs a corresponding electric signal, and supplies the electric signal to the ECU 5. Engine water temperature (T
W) The sensor 9 includes a thermistor or the like, detects an engine coolant temperature (cooling coolant temperature) TW, outputs a corresponding temperature signal, and supplies the temperature signal to the ECU 5.

An engine speed (NE) sensor 10 is provided around a camshaft or a crankshaft (not shown) of the engine 1.
And a cylinder discrimination (CYL) sensor 11. The engine speed sensor 10 outputs a TDC signal pulse at a crank angle position before a predetermined crank angle with respect to the top dead center (TDC) at the start of the intake stroke of each cylinder of the engine 1 (every 180 ° crank angle in a four-cylinder engine). The cylinder discriminating sensor 11 outputs a cylinder discriminating signal pulse at a predetermined crank angle position of a specific cylinder. These signal pulses are supplied to the ECU 5.

An exhaust pipe 12 of the engine 1 is provided with an electric heating catalyst (hereinafter referred to as "EHC") 13 and an exhaust gas purifier 14 containing a three-way catalyst in order from the upstream side. HC, CO, NOx in exhaust gas
Purification of components such as. The exhaust gas purification device 14 is provided with an exhaust gas temperature sensor 15 as exhaust gas temperature detecting means for detecting the exhaust gas temperature TGAS. Exhaust gas temperature sensor 15
Is disposed at a position that directly contacts the exhaust gas. Note that the temperature detection element of the exhaust gas temperature sensor 15 may be arranged so as to be directly exposed inside the exhaust pipe 12.

An electric circuit system including the EHC 13 and the ECU 5 is configured as shown in FIG. E of the present embodiment
The HC 13 is configured to function as a heater by energizing the catalyst itself. One end of the EHC 13 is connected to the terminal a of the switch 25 via the current sensor 27, and the other end is grounded. A voltage sensor 28 for detecting a voltage VEHC (hereinafter, referred to as “EHC voltage”) at both ends of the EHC 13 is connected, and detection signals of the current sensor 27 and the voltage sensor 28 are supplied to the ECU 5. Switch 2
The terminal b of 5 is connected to the positive electrode of the battery 26 and the vehicle-mounted electric device 30 other than the EHC 13. In-vehicle electrical device 3
0 includes, for example, an air conditioner (air conditioner), an automatic transmission, a power steering device, a headlight, a window heater, and the like.

A main alternator (hereinafter referred to as "MACG") 21 and a sub-alternator (hereinafter referred to as "SACG") 23 driven by the engine 1 are connected to the ECU 5 via regulators 22 and 24, respectively. The generated voltage is controlled by the ECU 5. Specifically, the ECU 5 includes the MACG 21 and the SACG 23
The energizing duty of the field winding of the regulators 22 and 2
4 to control the generated voltage. MA
One output terminal of the CG 21 is connected to the terminal c of the switch 25, and the other output terminal is grounded. Also SA
One output terminal of the CG 23 is connected to the electric device 30 (terminal b side of the switch 25), and the other output terminal is grounded.

The switch 25 is connected to the ECU 5, and its operation is controlled by the ECU 5. Switch 2
5 is normally connected to the terminal b side, and is connected to the terminal a side only when the EHC 13 is energized during the cold start. The voltage generated by the MACG 21 is determined by the switch 25
When the switch 25 is connected to the terminal b, 14.5 V is applied.
And a low voltage.

The negative electrode of the battery 26 is grounded, and the positive electrode is connected to the ECU 5. The ECU 5 measures an output terminal voltage (hereinafter simply referred to as “output voltage”) VB of the battery 26. The SACG 23 operates when the power consumption of the electric device 30 is large. Especially when the switch 25 is connected to the terminal a, the MACG2
1 is not supplied to the electric device 30, the SAC
Activate G23 to make up for the shortage of power supply.

The ECU 5 shapes input signal waveforms from various sensors, corrects a voltage level to a predetermined level, and converts an analog signal value into a digital signal value. 5b, storage means 5c for storing various calculation programs executed by the CPU 5b, calculation results and the like, an output circuit 5d for outputting control signals for the fuel injection valve 6, regulators 22, 24, switch 25, etc. Consists of The storage unit 5c is also backed up by a battery voltage even when the ignition switch is turned off, and is a backup RAM (Random Memory) as a non-volatile memory in which stored contents are retained.
Access Memory). The CPU 5b controls the energization of the EHC 13, that is, the switching control of the switch 25, the MACG 21 and the S based on the detection signals of the various sensors described above.
It controls the energization duty of the field winding of the ACG 23 (power generation voltage control), and determines abnormality of the EHC 13 and its power supply system.

FIG. 3 is a flowchart of a process for controlling the energization of the EHC 13. This process is executed by the CPU 5b in synchronization with generation of a TDC signal pulse or at predetermined time intervals. In step S11, it is determined whether or not the engine 1 is being started. If the engine is being started, the engine speed NE is determined.
Is higher than a predetermined rotational speed NE0 (for example, 1000 rpm) (step S12). When NE> NE0, the end flag FEND indicating "1" that the energization of the EHC 13 should be ended is set to "1". It is determined whether it is "1" (step S13). End flag FEND
Is set by the processing of FIG. 5 described later. Step S
13, when FEND = 0, the exhaust gas temperature TGA
It is determined whether SRAW is higher than a predetermined temperature TGAS0 (for example, 400 ° C.) (step S14). Here, the exhaust gas temperature TGASRAW is a corrected exhaust gas temperature obtained by correcting the value TGAS detected by the exhaust temperature sensor 15 according to the intake air temperature TA and the engine coolant temperature TW. Since the detection accuracy of the exhaust gas temperature sensor 15 decreases in a temperature range lower than about 900 ° C., the corrected temperature TGASRAW is used instead of the sensor detection value TGAS itself.

If the answer to step S14 is negative (NO), that is, if TGASRAW≤TGAS0, the switch 25 is connected to the terminal a to supply power to the EHC 13 (step S16). On the other hand, if the answer to step S11 or S12 is negative (NO) or the answer to step S13 or S14 is affirmative (YES), the engine is not being started, the engine speed NE is low, the energization of the EHC 13 is terminated. Or exhaust gas temperature TGAS
When the RAW is high, the battery voltage VB becomes the predetermined high voltage V
H (for example, 18 V) is determined, and VB> V
If B0, the process proceeds to step S16, where VB ≦
If it is VB0, the switch 25 is connected to the terminal b so that power is not supplied to the EHC 13 (step S17).

FIG. 4 is a flowchart of a process for controlling the generated voltage of the MACG 21. This process is performed in synchronism with the generation of the TDC signal pulse or at predetermined time intervals.
Executed in In step S31, it is determined whether or not the EHC 13 is energized, that is, whether or not the switch 25 is connected to the terminal “a”. When the EHC 13 is energized, the EHC voltage VEHC becomes lower than a predetermined low voltage VL (for example, 10 V). It is determined whether or not the temperature is low (step S32). If VEHC> VL, the exhaust gas temperature TGASRAW is reduced to the predetermined temperature T.
It is determined whether it is higher than GAS0 (step S3).
3). If the answer to step S33 is negative (NO), the regulator 22 is controlled so that the generated voltage of the MACG 21 becomes 30 V, while the switch 25 is connected to the terminal b.
Side, when VEHC ≦ VL,
Or, when the exhaust gas temperature TGASRAW is high, MA
The regulator 22 is controlled so that the generated voltage of the CG 21 becomes 14.5 V (step S35).

The determination in step S32 takes into account the operation delay of the switch 25 (the delay from the output of the switching control signal to the actual switching), and determines that the switch 25 has reliably switched to the terminal a. It is provided in order to.

FIG. 5 is a flowchart of a process for determining whether the energization of the EHC 13 is completed. This process is executed by the CPU 5b in synchronization with the generation of the TDC signal pulse or at predetermined time intervals. In step S41, it is determined whether or not the EHC 13 is energized, that is, whether or not the switch 25 is connected to the terminal "a". If not, the process is immediately terminated. Power supply end flag FFSVBHC indicating that power supply should be terminated
Is determined as "1" (step S42).
This flag FFSVBHC is a flag that is set to “1” when it is determined in another process (not shown) that the power supply system and the circuit system of the EHC 13 are abnormal.
When VBHC is “1”, the end flag FE is immediately
ND is set to "1" (step S45).

When FFSVBHC = 0 in step S42, the exhaust gas temperature TGASRAW is reduced to the predetermined temperature TG.
It is determined whether or not it is higher than AS0 (step S43).
When GASRAW> TGAS0, the EHC voltage V
It is determined whether the EHC is lower than a predetermined determination voltage VM (for example, 16 V) (step S44). And step S
43 and S44 are both affirmative (YES), that is, when the exhaust gas temperature TGASRAW is high and V
EHC <VM, and the output voltage of the MAGC 21 is 1
When returning to the vicinity of 4.5 V, the end flag FEND
Is set to “1” (step S45), and TGASRAW
When ≦ TGAS0 or VEHC ≧ VM, the energization should not be terminated (switch 25 is connected to terminal b
And the end flag FE
ND is set to "0" (step S46).

Step S44 is provided for switching the switch 25 after confirming that the output voltage of the MAGC 21 has returned to a low voltage, that is, around 14.5V.

FIG. 6 is a flowchart of a main routine for judging an abnormality of the EHC 13 or a power supply means for supplying electric power to the EHC 13. This process is executed every predetermined time (for example, 100 msec) while the EHC 13 is energized.
b. First, in step S50, an abnormality determination subroutine shown in FIG. 7 is executed. Step S7 in FIG.
1, the EHC voltage VEHC detected by the voltage sensor 28 and the current sensor 27 is multiplied by the current IEHC flowing through the EHC 13, so that the EHC 13
(Hereinafter referred to as "actually supplied power") WEH
Calculate C. Next, the actual supply power WEHC calculated in step S71 is applied to the following equation (1), and the integrated value of the actual supply power (hereinafter referred to as “actual supply power integration value”) WEHCS
Is calculated (step S72). WEHCS (n) = WEHCS (n-1) + WEHC (1) Here, (n) and (n-1) are added to indicate the current value and the previous value, respectively. (N) indicating the current value is usually omitted.

In the following step S73, the VEHCBASE table shown in FIG. 8 is searched according to the detected engine speed NE, and the power generation voltage VEHCBAS of the MAGC 21 is retrieved.
Calculate E. Originally, the power generation voltage is controlled to be 30 V, but it is considered that the voltage drops when the engine speed NE is low. In FIG. 8, the engine speeds NE1, NE2, and NE3 are, for example, 10
00 rpm, 3000 rpm, and 8000 rpm.

Next, the generated voltage VEHCBASE calculated in step S73 and the resistance value REHC of the EHC 13 (for example, about 350 mΩ) are applied to the following equation (2).
The power to be supplied to the EHC 13 (hereinafter referred to as “reference power”) WEHCBS is calculated (step S74). WEHCBS = VEHCBASE × VEHCBASE / REHC (2)

In the following step S75, the integrated value of the reference power (hereinafter referred to as "the integrated value of the reference power") is calculated by the following equation (3).
WEHCBSS is calculated. WEHCBSS (n) = WEHCBSS (n-1) + WEHCBS (3) Next, in steps S76 and S77, the following equation (4) is used.
According to (5), according to the reference power integrated value WEHCBSS,
The upper limit value WEHCSLMH and the lower limit value WEHCSLML of the actual supply power integrated value are calculated. WEHCSLMH = WEHCBSS (n) × α (4) WEHCSLML = WEHCBSS (n) × β (5) Here, α and β are coefficients set to, for example, 1.2 and 0.8, respectively.

Next, the actual supply power integrated value WEHCS is calculated as the upper limit value WEHCSLMH calculated in steps S76 and S77.
Is greater than or equal to (step S78), and the lower limit value WE
It is determined whether or not WEHCSLML ≦ WEHCS ≦ WEHCLM (step S79).
If it is H, it is determined to be normal and the abnormality determination flag FEH
CNG is set to “0” (step S80). on the other hand,
WEHCS> WEHCSLMH or WEHCS <WE
If HCSLML, use EHC13 or MACG
It is determined that there is an abnormality in the power supply system including the switch 21 and the switch 25, and the abnormality determination flag FEHCNG is set to “1”.
Is set (step S81).

Returning to FIG. 6, in step S51, it is set in step S56 that "1" indicates that the abnormality determination has been completed.
It is determined whether or not the end flag FFSEHCDON indicated by is “1”. Initially, since FFSEHCDON = 0, a predetermined time TMF from the start of engine 1 start
It is determined whether or not the SEHC (for example, 4.5 seconds) has elapsed (step S52). If the SEHC (e.g., 4.5 seconds) has not elapsed, this process is immediately terminated. If the SEHC has elapsed, the abnormality determination flag FEHCNG set in step S50 is set. It is determined whether it is "1" (step S53). If FEHCNG = 0 and it is not determined that an abnormality has occurred, an abnormality determination flag FFSEHCNG indicating “1” indicating that the abnormality determination has been determined is set to “0” (step S55), and the end flag FFS
EHCDON is set to "1" (step S56),
Proceed to step S57.

If FEHCNG = 1 in step S53 and it is determined that an abnormality has occurred, an abnormality determination flag FFSEHCNG is set to "1" to determine the abnormality determination (step S54), and the process proceeds to step S56. . After executing step S56, the answer to step S51 is affirmative (YES), and the process immediately proceeds to step S57.

In step S57, a soak flag F indicating "1" indicates that a sufficiently long time has elapsed since the previous operation.
It is determined whether or not SOAKH is “1”. For example, the soak flag FSOAKH is set to “1” when the engine stop time is at least 10 minutes or more, the engine coolant temperature TW is lower than 45 ° C., and the absolute value of the temperature difference between the engine coolant temperature TW and the intake air temperature TA is smaller than 3 ° C. It is set, otherwise it is set to "0".

If FSOAKH = 0 at step S57, the process immediately proceeds to step S63, where FSOAKH = 1.
If the soak time is sufficiently long, "1" is provided in the backup RAM when it is determined to be normal, and "0" is provided in the case where it is determined to be abnormal, according to the value of the abnormality determination flag FFSEHCNG. The data is written into the first bit of a 16-bit ring buffer as shown in FIG. 9 (step S58). When information is written to the first bit, the information stored in the first bit to the fifteenth bit moves from the second bit to the sixteenth bit, and the ring buffer stores the information in the sixteenth bit. The information that has been deleted is configured to be deleted. Note that the contents of the ring buffer are “010101” in an initial state (a state in which abnormality determination is not performed at all), as shown in FIG.
0101010111 ”, that is, it is desirable that the number of times determined to be normal is slightly larger than the number of times determined to be abnormal.

Next, the number of "1" stored in the ring buffer is defined as the number of normality determination X1, the number of "0" is defined as the number of abnormality determination X0 (step S59), and the number of normality determination X
It is determined whether or not 1 is greater than the abnormality determination number X0 (step S60). As a result, when X11 ≦ X0,
The warning flag FEHCVBNG indicating that the abnormality determination frequency X0 has become equal to or greater than the normal determination frequency X1 is set to “1” (step S62), and when X1> X0,
The warning flag FEHCVBNG is set to "0" (step S61), and the process proceeds to step S63.

In step S63, a warning lamp lighting control process shown in FIG. 10 is executed. In step S91 of FIG. 10, it is determined whether the warning flag FEHCVBNG is "1". When FEHCVBNG = 0, the on-duty DU substantially proportional to the illuminance of the warning light (not shown) is determined.
CHGLMP is set to 0% (step S93), and FEH
When CVBNG = 1, according to the field current duty ACGF of the MACG 21 and the battery voltage VB, FIG.
The on-duty DUCHGLMP is calculated by searching the DUCHGLMP table shown in FIG. In FIG. 11, lines L1 and L2 correspond to battery voltage VB = 14V, respectively.
In the range of 12 <VB <14, an interpolation operation is performed to calculate the on-duty DUCHGLMP. The DUCHGLMP table is set so that the DUCHGLMP value increases as the field current duty ACGF increases and as the battery voltage VB increases.

In a succeeding step S94, it is determined whether or not the power generation amount of the MACG 21 is sufficient. This determination is based on the MACG
This is performed by a signal input from the control unit 21 to the ECU 5.
If the power generation amount is sufficient, the process immediately proceeds to step S96, and if not, the on-duty DUCHGLMP is set to 100% (step S95), and step S9 is performed.
Proceed to 6. In step S96, the on-duty DUC
The warning light is turned on by HGLMP. That is, DUCH
If GLMP = 0, the warning light is not turned on, and the illuminance of the warning light increases as the on-duty DUCHGLMP increases.

As described above, in this embodiment, ECH13
WEHCS of the power actually supplied to the
Based on the generated voltage VEHCBASE of G21 and the integrated value WEHCBSS of the reference power WEHCBS to be supplied to the EHC 13, which is calculated using the generation voltage VEHCBASE of the GHC and the resistance REHC of the EHC 13, it is determined whether the EHC 13 or the power supply system for supplying power to the EHC 13 is abnormal. Therefore, it is possible to reliably determine not only an abnormality in which the actual power supply is larger than normal, but also an abnormality in which the actual power is smaller than normal.

In the present embodiment, the MACG 21, the regulator 22, the switch 25, and the wiring for connecting them correspond to the power supply means, and the power sensor 27, the voltage sensor 2
8 and steps S71 and S72 in FIG. 7 correspond to the supplied power detecting means, steps S73 to S75 in FIG. 7 correspond to the generated power calculating means, and steps S77 to S81 in FIG. 7 correspond to the abnormality determining means.

The present invention is not limited to the embodiment described above, and various modifications are possible. For example, in the above-described embodiment, the abnormality determination is performed using the actual supply power integrated value WEHCS and the reference power integration value WEHCBSS. However, the abnormality determination is similarly performed using the actual supply power WEHC and the reference power WEHCBS. The determination may be made. However, using the integrated value has the advantage that even a slight abnormality can be detected accurately.

In the above-described embodiment, the reference power integrated value WEHCBSS is multiplied by the coefficients α and β, and the upper and lower limit values WEHCSLMH, WEH of the actual supplied power integrated value WEHCS are multiplied.
Although CLML is set, the actual supply power integrated value WEHC
S is multiplied by a predetermined coefficient to obtain a reference power integrated value WEHCBS.
Upper and lower limit values of S WEHCBSSLMH, WEHCBSSL
ML may be set, and an abnormality determination may be made based on whether or not the reference power integrated value WEHCBSS is within the range of the upper and lower limits. That is, the actual supply power integrated value WEHCS
And the reference power integrated value WEHCBSS to determine the abnormality, for example, the actual supply power integrated value W
The determination may be made based on whether or not the absolute value of the difference between EHCS and the reference power integrated value WEHCBSS is smaller than a predetermined reference value. The lighting of the warning light is performed by the abnormality determination flag FEHCNG.
Becomes "1" or the abnormality confirmation flag FFS
It may be executed when EHCNG becomes “1”.

[0042]

As described above in detail, according to the present invention, the actual supply power actually supplied when the electric heating catalyst is heated is detected, and the reference power to be supplied by the power supply means is calculated. The abnormality of the electrically heated catalyst or the power supply means is determined based on the actual supply power and the reference power, so that not only the abnormality of the actual supply power than normal, but also the abnormality of less than normal is ensured. Can be determined.

[Brief description of the drawings]

FIG. 1 is a diagram showing an internal combustion engine and a control device thereof according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an electrically heated catalyst, an alternator, and peripheral circuits thereof.

FIG. 3 is a flowchart of a process for controlling the energization of an electrically heated catalyst.

FIG. 4 is a flowchart of a process for controlling a generated voltage of an alternator.

FIG. 5 is a flowchart of a process for determining the termination of energization of the electrically heated catalyst.

FIG. 6 is a flowchart of a main routine for determining abnormality of an electrically heated catalyst or the like.

FIG. 7 is a flowchart of a subroutine for determining abnormality of an electrically heated catalyst or the like.

FIG. 8 is a diagram showing a table used in the processing of FIG. 7;

FIG. 9 is a diagram for explaining a ring buffer that stores an abnormality determination result.

FIG. 10 is a flowchart of a warning light lighting control process.

FIG. 11 is a diagram showing a table used in the processing of FIG. 10;

[Explanation of symbols]

Reference Signs List 1 internal combustion engine 5 electronic control unit (supply power detection means, generated power calculation means, abnormality determination means) 21 main alternator (power supply means) 22 regulator (power supply means) 25 switch (power supply means) 27 current sensor (supply power) Detection means) 28 Voltage sensor (supply power detection means)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G091 AA02 AA23 AA28 AB03 BA03 BA14 BA15 BA19 BA23 BA31 BA34 CA04 CB02 CB03 CB08 DA01 DA02 DB06 DB10 DB13 DC05 EA01 EA06 EA07 EA15 EA16 EA17 EA26 EA27 EA04 EA04

Claims (1)

[Claims] 1. A control device for an internal combustion engine provided with a power supply means for supplying electric power to an electrically heated catalyst provided in an exhaust system of the internal combustion engine, wherein an actual supply power supplied when the electrically heated catalyst is heated. Supply power detection means for detecting the reference power, reference power calculation means for calculating reference power to be supplied by the power supply means, and the electric power based on the output of the supply power detection means and the output of the reference power calculation means. A control unit for an internal combustion engine, comprising: an abnormality determination unit configured to determine abnormality of the heating catalyst or the power supply unit.