JP2003269237A - Failure judging device for throttle valve angle sensing system of internal-combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a failure judging device for a throttle valve angle sensing system which judges any failure accurately while a misjudgement during the operation with part of cylinders resting is avoided. <P>SOLUTION: The failure judging device 1 is to judge any failure in the throttle angle sensing system 7 of the internal-combustion engine 3 for working in changing-over between the full cylinder operation in which all cylinders are put in operation and the partial cylinder resting operation in which part of the cylinders is/are put resting and for sensing the opening/closing condition of the throttle valve 6 installed on a suction pipe 5. The device is also equipped with: an intra-pipe pressure sensing means 9 for the suction pipe to sense the pressure in the downstream of the throttle valve 6; a failure judging means 2 to judge any failure in the low-opening side characteristics of the throttle valve angle sensing system 7 on the basis of the sensed intra-pipe pressure PBA, an operating condition judging means 2 to judge whether the engine 3 is in the partial cylinder resting operation or not; and a judgement prohibiting means 2 to prohibit failure judgement when the result from judgement is as the partial cylinder resting operation. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
All-cylinder operation and at least one of the cylinders
Switch to partial cylinder deactivated operation to suspend operation of the
In a rotating internal combustion engine, the throttle valve opening detection system
An abnormality in the throttle valve opening detection system of the internal combustion engine
It relates to a normal determination device. 2. Description of the Related Art A conventional cylinder deactivated type internal combustion engine of this type
And disclosed in, for example, JP-A-2001-227369.
What was done is known. In this internal combustion engine, some
Between the intake valve and intake cam of the cylinder, and between the exhaust valve and exhaust
Connection between the intake and exhaust valves
, The all-cylinder operation is performed.
By releasing the connection, the intake and exhaust valves are closed.
In this state, the partial cylinder deactivation operation is performed. all
Switching between cylinder operation and partial cylinder deactivation operation is performed by the internal combustion engine.
This is performed in accordance with the operating state, and is performed in a predetermined
When the shift conditions are satisfied, the partial cylinder
And thereby ensure good fuel economy. [0003] Also, there is a difference in the conventional throttle valve opening detection system.
For example, Japanese Patent Application Laid-Open No. 8-17760
The one disclosed in Japanese Patent Publication No. 2 is known. This abnormal judgment
The setting device applies to normal internal combustion engines that are not cylinder
It is determined whether the throttle valve is fully closed or not.
This is to determine the abnormality of the idle switch to be detected.
You. Specifically, it is a parameter indicating the load of the internal combustion engine.
For example, if the intake pipe internal pressure is detected and the intake pipe internal pressure is high
And the idle switch is fully closed
The internal combustion engine has a high load
It is assumed that the throttle valve is largely open.
Although it can be set, it is actually an idle switch
Does not indicate the operating state of such a throttle valve
It is determined that the idle switch has failed. [0004] However, the conventional technique described above
Of abnormality judgment by abnormality judgment device of idle switch
Method detects the throttle valve opening of a cylinder-inactive type internal combustion engine
When applied to a throttle valve opening sensor that performs
There is such a problem. That is, as described above, partial cylinder deactivation
One of the operating conditions for operation is deceleration,
During the deactivated cylinder operation, the intake valves of some cylinders are closed.
It is kept in a state. For this reason, partial cylinder deactivation operation during deceleration
When the operation is performed, the
The air suction force of the piston in the cylinder is absorbed by the cylinder.
As it does not act on the trachea, the negative pressure in the intake pipe increases
It becomes a stake. Also, when decelerating, usually the accelerator
The pedal is not depressed and the throttle valve is almost
Closed. In other words, the partial cylinder deactivation operation is performed during deceleration.
When running, the throttle valve is almost fully closed
Condition and the fact that the negative pressure in the intake
A relatively high pressure condition may occur at the same time. [0006] Then, when in such a state,
The low opening side characteristic is determined by the abnormality determination device of the rottle valve opening sensor.
The throttle valve is almost fully closed.
There is a throttle valve opening sensor.
Indicates that the valve is open and the intake pipe pressure is high.
It is determined that the throttle valve opening sensor is out of order
It meets the conditions. As a result, the throttle
The valve is in the low opening state and the throttle valve opening sensor is normal
Error that the unit is malfunctioning
There is a problem that an incorrect judgment is made. [0007] The present invention is to solve such a problem.
The error during partial cylinder deactivated operation
Accurate judgment while avoiding the judgment
To provide an abnormality determination device for a throttle valve opening detection system capable of
It is intended to be. [0008] In order to achieve this object,
In addition, the present invention provides a plurality of cylinders (in the embodiment (hereinafter, referred to as
Operate all cylinders # 1 to # 4)
All-cylinder operation and at least some of the cylinders
Partial cylinder deactivated operation in which the operation of the cylinders (# 2 to # 4) is deactivated
The operation is switched to
Throttle valve for detecting the opened / closed state of the throttle valve 6
Judgment of abnormality of opening detection system (throttle valve opening sensor 7)
Determination device for throttle valve opening detection system of rotating internal combustion engine
1 and downstream of the throttle valve 6 of the intake pipe 5
Intake pipe pressure detection to detect pressure (intake pipe absolute pressure PBA)
Delivery means (absolute pressure sensor 9 in intake pipe) and detected intake air
Based on the pipe pressure PBA, the throttle valve opening detection system (s
Judgment of abnormality of low opening side characteristic of rottle valve opening sensor 7)
Abnormality determination means (ECU 2, step 6 in FIG. 2 and
Step 8), when the internal combustion engine 3 is in the partial cylinder deactivated operation
Operating state determining means (ECU2, FIG. 2
Step 4), and the internal combustion engine 3
Is abnormal when it is determined that
A determination prohibition unit (ECU) that prohibits the determination by the determination unit
2. Step 4) of FIG. 2
I do. The throttle valve opening detection system of the internal combustion engine
According to the abnormality determination device, the suction pipe internal pressure detecting means detects the suction pressure.
Detects pressure in the trachea and, based on the detected value,
Low opening side characteristics of the throttle valve opening detection system
Is determined. In addition, the operating state determination means
When it is determined that the fuel engine is in partial cylinder deactivated operation
Is a throttle valve opening detection system
Prohibition of abnormal judgment. As described above, partial cylinder deactivation
During operation, when the throttle valve is in the low opening state,
In some cases, such as when the negative pressure in the intake pipe is difficult to rise,
Since the pipe pressure behaves differently than during all-cylinder operation,
When it is determined that the partial cylinder deactivated operation is in
By prohibiting the abnormality judgment of the torque valve opening detection system,
Incorrect judgment due to different behavior of the intake pipe pressure
Can be prevented and the throttle valve opening is detected as a whole.
Accurate abnormality determination of the system can be performed. The present invention will be described below with reference to the drawings.
A preferred embodiment will be described in detail. FIG. 1 shows the present invention.
Of Abnormality of Throttle Valve Opening Sensor of Internal Combustion Engine Applying FFT
Of the fixed device (hereinafter simply referred to as “abnormality determination device”) 1
1 shows the configuration. As shown in FIG.
The device 1 is provided with an ECU 2, which is an internal combustion engine.
According to the operating state of the engine (hereinafter referred to as “engine”) 3
Then, control processing as described later is executed. The engine 3 is mounted on a vehicle (not shown).
For example, with a 4-cycle DOHC gasoline engine
Yes, with four cylinders # 1 to # 4 (a plurality of cylinders)
You. The engine 3 is of a cylinder deactivated type.
Cylinder deactivation mechanism for deactivating some of cylinders # 2 to # 4
4 are provided. The cylinder deactivating mechanism 4 is provided for an intake valve and an exhaust valve.
Hydraulic pump through a pneumatic valve oil passage (none shown)
(Not shown), these oil passages
A pressure control valve (not shown) is provided for each. this
These hydraulic control valves are configured as a normally closed type,
It is electrically connected to the ECU 2 and the drive from the ECU 2
Each oil path is opened when turned on by a motion signal
I do. With the above configuration, during the partial cylinder deactivated operation, the oil
Both pressure control valves are turned ON and the oil passages are opened respectively.
As a result, the hydraulic pressure from the hydraulic pump is
Supplied to As a result, the cylinder deactivating mechanism 4 sets the cylinder #
In steps 2 to 4, the intake valve and intake cam (not shown)
And the connection between the exhaust valve and the exhaust cam (not shown)
Release and close the intake and exhaust valves.
Therefore, the operation mode of the engine 3 is controlled to the partial cylinder deactivated operation.
Is controlled. On the other hand, during all-cylinder operation, the hydraulic control valve is
Both are turned off and the oil passages are closed respectively.
Accordingly, the supply of the hydraulic pressure from the hydraulic pump is stopped. to this
As a result, the cylinder deactivation mechanism 4 operates between the intake valve and the intake cam,
And the exhaust valve and exhaust cam are connected, and the intake valve and exhaust
By operating the air valve, the engine 3 is operated.
The mode is controlled to all-cylinder operation. The intake pipe 5 of the engine 3 has a throttle valve
6 which is connected to the throttle valve 6
Actuator (not shown) is electrically connected to the ECU 2.
It is connected to the. In response to a drive signal from ECU 2,
The opening of the throttle valve 6 is controlled by controlling the actuator.
Degree (hereinafter referred to as “throttle valve opening”) TH changes
You. Throttle valve opening TH is a throttle valve opening sensor
7, and the detection signal is output to the ECU 2.
It is. Further, compared to the throttle valve 6 of the intake pipe 5,
On the downstream side, an intake air temperature sensor 8 and an absolute pressure sensor in the intake pipe are provided.
A sensor 9 (intake pipe internal pressure detecting means) is provided. This sucking
The temperature sensor 8 is composed of a thermistor,
5 detects the intake air temperature TA, and sends the detection signal to the ECU 2.
Output. The intake pipe absolute pressure sensor 9 detects the semiconductor pressure.
And an absolute pressure P in the intake pipe 5.
BA is detected, and a detection signal is output to the ECU 2. The intake pipe 5 is provided with an intake manifold.
Connected to the four cylinders # 1 to # 4 via the
And each branch portion of the intake manifold 5a.
In FIG. 5b, an intake port (not shown) of each cylinder is faced.
Are provided with injectors 10, respectively. these
Is driven by a drive signal from the ECU 2.
Fuel is injected into each branch portion 5b
I do. Also, during the partial cylinder deactivated operation, cylinders # 2 to # 4
Is stopped from each injector 10. The main body of the engine 3 contains engine water.
Temperature sensor 11, crank angle sensor 12, and engine oil
A temperature sensor 13 is attached. Engine water temperature sensor
The sensor 11 is composed of a thermistor or the like, and has an engine
Cooling water circulating in cylinder block 3 (not shown)
The engine water temperature TW, which is the temperature of the
To ECU2. On the other hand, the crank angle sensor 12
As the crankshaft (not shown) of engine 3 rotates
CRK, which is a pulse signal, at every predetermined crank angle
A signal is output to ECU2. The ECU 2 transmits the CRK signal
The engine speed NE is determined on the basis of the number. Also,
The gin oil temperature sensor 13 detects the engine oil temperature TOIL
Then, the detection signal is sent to the ECU 2. The ECU 2 has a vehicle speed sensor 14 and
And an atmospheric pressure sensor 15 are connected.
14 detects the vehicle speed VP. The atmospheric pressure sensor 15
Is composed of a semiconductor pressure sensor and the like, and has an atmospheric pressure P
A is detected. These detection signals are sent to the ECU 2
You. Further, the ECU 2 includes gears of a transmission (not shown).
The gear corresponding to the gear is determined from the gear sensor 16 for detecting the gear.
An output signal representing the shift position number NGR is output. Further, the ECU 2 includes a throttle valve opening degree.
When it is determined that the sensor 7 is abnormal, the driver
A warning lamp 17 for notifying the user is connected. On the other hand, in this embodiment, the ECU 2
Abnormality determination means, operation state determination means, and determination inhibition means
It constitutes. The ECU 2 is an I / O interface
Base, CPU, RAM, ROM, etc.
It consists of a computer. Various sensors described above
The detection signals from the I / O interface
After A / D conversion and molding are performed in the
You. The CPU generates an engine based on these input signals.
3 is determined, and a drive signal based on the determination is generated.
By outputting to the cylinder deactivation mechanism 4, the operation mode is changed.
Switching between full cylinder operation and partial cylinder operation
Then, as described below, the throttle valve opening sensor
7 is performed. FIG. 2 shows the throttle valve opening sensor 7.
Float of abnormality judgment processing for judging abnormality of low opening side characteristics
Chart. In this case, the target of abnormality judgment
Not only the throttle valve opening sensor 7 itself but also the throttle
Signal transmission for transmitting a detection signal of the throttle valve opening TH to the ECU 2
Up to the system. This processing and the processing described later
The processing is repeatedly executed at a predetermined cycle. As shown in FIG. 1, in this processing, first,
Step 1 (displayed as “S1” in the drawing. The same applies hereinafter)
And in step 2, the determination completion flag F_DONERL is
Whether it is “1” and whether the absolute pressure sensor 9 in the intake pipe is
It is determined whether the operation confirmation flag F_KOKB is “1”.
Each is determined. This determination completion flag F_DONERL
When the abnormality determination processing by this processing ends,
It is set to "1". In addition, the operation confirmation flag
F_KOKB is absorbed by another routine not described.
Abnormality of the tracheal absolute pressure sensor 9 is detected, and
Set to "1" when set. If the decision result in the step 1 is YES, or
When the determination result of step 2 is NO, the throttle valve is opened.
It is determined that the abnormality determination of the
Proceed to step 16 and step 17. In step 16
Is a down count type normality determination wait timer TOKRL
For a predetermined time #TMFSRL (for example, 2.0 sec).
Cut. In step 17, similarly to step 16,
The abnormality determination waiting timer TFSRL is set to the same predetermined time # as described above.
This is set to TMSRL and the process ends. On the other hand, if the decision result in the step 1 is NO,
If the determination result of step 2 is YES,
A state in which it is possible to execute an abnormality determination of the rottle valve opening sensor 7
The engine speed N
E is a predetermined lower limit rotational speed #NTHCKLL (for example, 13
00 rpm) and a predetermined upper limit rotational speed #NTH
Whether it is smaller than CKLH (for example, 5500 rpm)
Or the vehicle speed VP is equal to a predetermined lower limit vehicle speed #VTHCKLL (example
Is greater than 24 km / h), and
Gin water temperature TW is equal to a predetermined lower limit water temperature #TWPBTHCK.
(For example, 70 ° C.). this
When the determination result is NO, that is, when the above three conditions
If any of the conditions are not satisfied, the engine 3
Is not in an operating state suitable for abnormality determination, and
6 and step 17 are executed, and the present process ends. When the determination result of step 3 is YES
Is determined by a partial cylinder deactivation operation execution condition determination process described later.
F_DECC, a partial cylinder deactivated operation flag set
It is determined whether or not S is "1" (step 4).
When the result of this determination is YES, that is, when the engine
When the operation mode 3 is the partial cylinder deactivated operation,
Steps 16 and 17 are executed to execute this processing.
finish. In this way, it is determined that the partial cylinder
When separated, execution of abnormality determination by this process is prohibited
Is done. If the decision result in the step 4 is NO, an answer is affirmative.
That is, when the operation mode of the engine 3 is the all-cylinder operation
By searching the #PBTHCKHN table
Table value #PBTHCKHN according to the atmospheric pressure PA.
And determine it as a determination value PBTTHCKH for the intake pipe internal pressure.
(Step 5). Figure 3 shows an example of the table
And the table value #PBTHCKHN is the atmospheric pressure PA
Is the second predetermined pressure PA2 (for example, 760 mmH
g), the second predetermined value # PBTHCKH2 (for example,
620 mmHg) and the atmospheric pressure PA is equivalent to high altitude.
At the first predetermined pressure PA1 (for example, 459 mmHg)
Is the first location smaller than the second predetermined value # PBTHCKH2.
Set to constant value # PBTTHCKH1 (for example, 368 mmHg)
And between them, it is determined by interpolation calculation. Next, the absolute pressure PBA in the intake pipe is determined by the step
Whether it is greater than the judgment value PBTHCKH set in 5
Is determined (step 6). If the result of this determination is NO
That is, the absolute pressure PBA in the intake pipe is low and the engine
When the load of No. 3 is not high, the steps 16 and
Step 17 is executed, and this processing ends. When the determination result of step 6 is YES,
That is, the absolute pressure PBA in the intake pipe is high,
When the load is high, #THFRHAN tape for AT vehicles
#THFRHMN table for vehicle or MT car
The table value according to the engine speed NE.
Find #THFRHAN or #THFRHMN,
Judgment value THF for judging abnormality of the throttle valve opening sensor 7
Set as RH (step 7). FIG. 4 shows the table.
Table value #THFRHA.
N or #THFRHMN indicates that the engine speed NE is large.
The higher the setting, the larger the setting. this
Means that as the engine speed NE increases,
The amount of air is required, and the throttle valve opening T
This is because H is controlled to be large. Specifically
Is the table value #THFRHMN for an MT vehicle
Indicates that the predetermined engine speed NE is equal to the first to fifth predetermined times.
Inversion numbers NE1 to NE5 (for example, 1000, 20
00, 3000, 4000, 6000 rpm)
First to fifth predetermined values (for example, 2.01,
6.99, 10.41, 12.27, 14.61 °)
Is set. Also, table value #THF for AT vehicles
RHAN is set to table value #THFRHMN for MT vehicles.
On the other hand, it is set to a value obtained by adding a predetermined angle. this
Is the driving torque of the automatic transmission in the case of an AT car.
The throttle valve opening TH is higher than that of the MT model by the transmission loss.
Is also controlled to a large value. Next, the throttle valve opening TH is determined by the step
7 is smaller than the judgment value THFRH set in step 7.
Separate (step 8). If the determination is NO, PBA
> PBATHCKH and TH ≧ THFRH hold
When the throttle valve opening TH is large,
When the intake pipe absolute pressure PBA is high, the throttle valve
Assuming that the opening degree sensor 7 is normal, proceed to step 9;
As in step 17, the abnormality determination wait timer TF
The SRL is set to a predetermined time #TMFSRL. Next, the process proceeds to step 10 and waits for a normality judgment.
It is determined whether or not the timer TOKRL is “0”. This
When the result of the determination is NO, this process is terminated. On the other hand, if the decision result in the step 10 is YES,
Time, that is, PBA> PBTHCKH and TH ≧ T
When the state of HFRH has continued for a predetermined time #THFRH
Determines that the throttle valve opening sensor 20 is normal
In order to indicate this, the normal flag F_OKRL is set.
It is set to "1" (step 11). Thus, positive
After determining that it is normal, wait for a predetermined time to elapse before making a determination.
By making the determination, the determination can be made appropriately.
Next, the routine proceeds to step 18, where the determination completion flag F_DO
NE07RL is set to "1", and this process ends. On the other hand, if the decision result in the step 8 is YES,
That is, PBA> PBTHCKH and TH <THF
When RH is established, the intake pipe internal pressure absolute pressure PBA becomes high.
In spite of the high load of the engine 3,
The detection value of the throttle valve opening sensor 7 indicates a low opening.
As a result, the characteristics of the throttle valve opening sensor 7 on the low opening side are improved.
It is determined that it is abnormal. Next, proceed to step 12,
The normal judgment wait timer TOKRL is set to a predetermined time #TMFSRL.
Set to. Then, the process proceeds to a step S 13, and waits for an abnormality judgment.
It is determined whether or not the timer TFSRL is "0". This
When the result of the determination is NO, the present process is terminated. On the other hand, if the decision result in the step 13 is YES,
Time, that is, PBA> PBTHCKH and TH <T
When the state of HFRH has continued for a predetermined time #TMFSRL
Set the normality flag F_OKRL to “0” (
Step 14) Set the abnormality flag F_FSDRL to “1”.
(Step 15) and the Step 18
To set the determination completion flag F_DONERL to “1”.
After this, the process is terminated. Abnormality flag F_FSD
By setting RL to “1”, the throttle
It is operated that the characteristic of the low opening degree of the valve opening sensor 7 is abnormal.
Warning lamp 17 is turned on by the ECU 2 to inform the
Is lit. After step 18 has been executed,
Is different because the determination result of step 1 is YES.
The normal judgment is one time between the start and the stop of the engine 3.
Only be executed. FIG. 5 shows the determination of the execution condition of the partial cylinder deactivation operation.
It is a flowchart which shows a process. This process is
Execution condition of the partial cylinder deactivation operation according to the operation state of
Is to be determined. First,
In Steps 19 to 22, the intake air temperature TA increases
A second predetermined temperature #TADCSL (for example, −20 ° C.), #
Within a predetermined range specified by TADCSH (for example, 90 ° C.)
The engine water temperature TW is higher than the first and second
Predetermined water temperature #TWDSL (for example, -20 ° C), #TWD
Within the specified range specified by CSH (for example, 120 ° C)
Whether the atmospheric pressure PA is equal to the first and second predetermined pressures #P
ADCSL (for example, 600 mmHg), #PADSH
(For example, 770 mmHg)
Or not, and the throttle valve fully closed flag F_THID
It is determined whether or not LE is “1”. this
The throttle valve fully closed flag F_THIDLE is
Is set to "1" when the valve 6 is fully closed.
is there. If any of these answers is NO, skip
That is, the intake air temperature TA, the engine water temperature TW and the atmospheric pressure PA
Any of them are outside their respective predetermined ranges or
Or when the throttle valve 6 is not fully closed,
Set the partial cylinder deactivated operation flag F_DECCS to its previous value.
F_DECCS1 (step 23)
In addition, if the conditions for executing the partial cylinder deactivation operation are not satisfied,
Then, the partial cylinder deactivated operation flag F_DECCS is set to “0”.
(Step 24) and terminate this program.
You. Each of the answers in steps 19 to 22 is
If YES, the AT flag F_AT is "1"
It is determined whether or not this is the case (step 25). The answer is no,
If the vehicle is an MT vehicle, the following steps 26 and 27
, The shift position number detected by the gear position sensor 16
The value of the signal NGR is a predetermined value #NGRDCS (e.g.
Or not) and the half clutch flag F_N
It is determined whether GRHCL is “0” or not.
You. Any of the answers in steps 25 and 27
Is NO, that is, the current gear is
Or when the clutch is half-clutched,
Assuming that the execution condition of the minute cylinder
Step 23 and subsequent steps are executed to terminate this program.
You. On the other hand, if any of these answers is YES,
Step 28 described below is executed. On the other hand, if the answer to step 25 is YES,
When the vehicle is an AT vehicle, the next step 29 and
At 30, a neutral flag F_ATNP and
It is determined whether the reverse flag F_ATPR is “1”.
Each is determined. This neutral flag F_ATNP
Shift lever is in neutral or parking
The reverse flag F_ATPR is
When the left lever is in reverse,
It is set to "1". Either of the answers of steps 29 and 30
Is YES, the execution condition of the partial cylinder deactivation operation is
If not, execute step 23 and subsequent steps
And terminate the program. On the other hand, none of these answers
No, the shift lever is in the forward position
At times, the process proceeds to step 28. This step 28 and step 31,
At 32, the engine oil temperature TOIL is the first and second
Predetermined temperature #TODCSL (for example, 20 ° C.), #TODC
Within a predetermined range defined by SH (for example, 110 ° C.)
Whether or not the vehicle speed VP is the first and second predetermined vehicle speeds #VP
DCSL (for example, 20 km / h), #VPDCSH (example
For example, 120 km / h)
No, and whether the engine speed NE is equal to the first and second
Predetermined rotation speed #NDCSL (for example, 1000 rpm), #
Prescribed specified by NDSH (for example, 4000 rpm)
It is determined whether or not it is within the range. If any of these answers is NO, skip
That is, the engine oil temperature TOIL, the vehicle speed VP, and the engine speed
Any of the number of turns NE is out of the predetermined range.
The execution condition of the partial cylinder deactivation operation is satisfied
If not, execute step 23 and subsequent steps
Exit the gram. On the other hand, none of these answers is YE
When S, the condition for executing the partial cylinder deactivation operation is satisfied.
As in step 23,
The cylinder deactivated operation flag F_DECCS is set to its previous value F_D.
Certified as ECCS1 (Step 33)
Set the partial cylinder deactivated operation flag F_DECCS to “1”.
(Step 34), and the program ends. As described above, the abnormality determination apparatus according to the present embodiment
According to No. 1, it was detected by the absolute pressure sensor 9 in the intake pipe.
Based on the intake pipe absolute pressure PBA, the throttle valve opening
An abnormality in the low opening degree characteristic of the sensor 7 is determined. In addition, engine
When it is determined that the engine 3 is in the partial cylinder deactivated operation
Is the throttle valve opening based on the intake pipe absolute pressure PBA.
The abnormality determination of the sensor 7 is prohibited. That is, the throttle valve
When the opening degree sensor 7 is normal, the absolute pressure P in the intake pipe
When the BA is relatively high and the throttle valve 6 is almost fully closed
Partial cylinder breaks where certain conditions can occur simultaneously
Abnormality determination is prohibited during the stop operation. Accordingly
During the partial cylinder deactivation operation, the throttle valve opening
Sensor 7 is operating normally,
Mistaken determination is avoided,
To accurately determine whether the throttle valve opening sensor 7 is abnormal.
be able to. In the embodiment, the throttle valve
Targeting the throttle valve opening sensor 7 as the opening detection system
Abnormality judgment is performed, but instead of this, for example,
Idle for detecting that the rottle valve 6 is fully closed
A switch or the like may be a target of the abnormality determination. As described above, the slot of the internal combustion engine of the present invention is
The abnormality determination device of the throttle valve opening detection system uses partial cylinder deactivated operation.
Correct anomaly judgment while avoiding erroneous judgment during turning
This has the effect that it can be performed reliably.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a throttle valve opening sensor abnormality determination device according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating an example of an abnormality determination process of a throttle valve opening sensor. FIG. 3 shows an intake pipe internal pressure determination value PBT according to an atmospheric pressure PA.
It is an example of a table for setting HCKH. FIG. 4 is an example of a table for setting a throttle valve opening abnormality determination value THFRH according to an engine speed NE. FIG. 5 is a flowchart illustrating an example of an execution condition determination process of a partial cylinder deactivation operation. [Description of Signs] 1 Abnormality judging device 2 ECU (abnormality judging means, operating state judging means, judgment prohibiting means) 3 Engine (internal combustion engine) # 1 to # 4 Four cylinders (plural cylinders) # 2 to # 4 Cylinder 5 part Intake pipe 6 Throttle valve 7 Throttle valve opening sensor (Throttle valve opening detection system) 9 Intake pipe internal pressure absolute pressure sensor (Intake pipe internal pressure detecting means) TH Throttle valve opening PBA Intake pipe absolute pressure

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02D 13/06 F02D 13/06 D 41/22 310 41/22 310Z (72) Inventor Futoshi Nishioka Wako Saitama 1-4-1, Chuo, Ichichuo, Japan Honda Technical Research Institute, Inc. (72) Inventor Atsushi Matsubara 1-4-1, Chuo, Wako, Saitama, Japan F-term in Honda R & D Co., Ltd. 3G065 AA00 CA38 DA04 EA05 GA01 GA09 GA10 GA11 GA26 GA27 GA31 GA41 3G084 AA03 BA05 CA06 DA27 DA29 EA04 EB08 EB12 EB22 FA01 FA02 FA05 FA06 FA10 FA11 FA20 FA33 FA38 3G092 AA01 AA14 AB02 CA08 DC03 EC10 FB04 FB06 GA13 GB08 HA04Z HA05Z03 Z03 JB07 JB09 KA16 LA01 PA07Z PA09Z PA10Z PA11Z PE01Z PE03Z PE08Z PF01Z PF07Z

Claims (1)

Claims: 1. An operation that switches between an all-cylinder operation in which all of a plurality of cylinders are operated and a partial-cylinder deactivation operation in which operation of at least a part of the plurality of cylinders is stopped. An abnormality determination device for a throttle valve opening detection system of an internal combustion engine that determines an abnormality of a throttle valve opening detection system that detects an open / close state of a throttle valve provided in an intake pipe; An intake pipe internal pressure detecting means for detecting a pressure downstream of the throttle valve; and an abnormality determination for determining an abnormality in the low opening side characteristic of the throttle valve opening detection system based on the detected intake pipe internal pressure. Means, operating state determining means for determining whether or not the internal combustion engine is in the partial cylinder deactivated operation, and determining that the internal combustion engine is in the partial cylinder deactivated operation by the operating state determining means. When it is, the abnormality determination means that it and a determination inhibiting means for inhibiting the determination by the throttle valve opening detecting system abnormality determination apparatus for an internal combustion engine characterized by.