JP2006194160A - Abnormality diagnosis device for suction system sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To previously prevent erroneous diagnosis of abnormality diagnosis of an air flow meter and a suction pipe pressure sensor by influence of deposit of a throttle valve. <P>SOLUTION: The abnormality diagnosis device determines whether or not both an air flow meter 14 and a suction pipe pressure sensor 19 are normal by the fact whether or not an amount of suction air obtained from output of the air flow meter 14 and an amount of suction air obtained from output of the suction pipe pressure sensor 19 is within a normal range near 1 when air flow meter abnormality diagnosis for comparing the detected amount of suction air of the air flow meter 14 with throttle base amount of suction amount obtained from output of a throttle opening sensor 17 and suction pipe pressure sensor abnormality diagnosis for comparing the detected suction pipe pressure of the suction pipe pressure sensor 19 with a throttle base suction pipe pressure obtained from output of the throttle opening sensor 17 are performed. When it is determined that both are normal, the air flow meter abnormality diagnosis and the suction pipe pressure sensor abnormality diagnosis are forbidden. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an abnormality diagnosis device for an intake system sensor for diagnosing the presence or absence of an abnormality in an intake system sensor (intake air amount sensor, intake pipe pressure sensor) of an internal combustion engine.

As an abnormality diagnosis of a conventional intake system sensor, for example, as described in Patent Document 1 (US Pat. No. 5,384,707), the output of the throttle opening sensor (throttle opening), the rotational speed of the internal combustion engine, The intake air amount sensor (hereinafter referred to as “throttle base intake air amount”) is compared with the intake air amount detected by the intake air amount sensor (air flow meter) to diagnose the abnormality of the intake air amount sensor. There is something that was made.
US Pat. No. 5,384,707 (page 5, FIG. 2, etc.)

  By the way, dust in the intake air may adhere to the throttle valve arranged in the intake pipe of the internal combustion engine. If this deposit (deposit) increases, the throttle valve will pass through the throttle valve even at the same opening degree. Since the amount of air to be reduced decreases, the difference between the intake air amount detected by the intake air amount sensor and the throttle base intake air amount increases.

  Therefore, as in the above-mentioned Patent Document 1, in the system that compares the throttle base intake air amount with the intake air amount detected by the intake air amount sensor and diagnoses the abnormality of the intake air amount sensor, the deposit amount of the throttle valve increases. In this case, the difference between the intake air amount detected by the intake air amount sensor with respect to the throttle base intake air amount becomes large, and a normal intake air amount sensor may be erroneously diagnosed as abnormal.

  The present invention has been made in consideration of such circumstances. Accordingly, the object of the present invention is to provide a normal intake system sensor (intake air amount sensor, intake pipe pressure sensor) under the influence of a throttle valve deposit or the like. An object of the present invention is to provide an abnormality diagnosis device for an intake system sensor that can prevent an abnormality from being erroneously diagnosed.

  To achieve the above object, an invention according to claim 1 is directed to an intake air amount sensor for detecting an intake air amount of an internal combustion engine, an intake pipe pressure sensor for detecting an intake pipe pressure, and a throttle for detecting a throttle opening. Applicable to a system having an opening sensor, the intake air amount sensor obtained by comparing the intake air amount information obtained from the output of the intake air amount sensor with the intake air amount information obtained from the output of the throttle opening sensor Intake air pressure sensor abnormality diagnosis and / or intake air pressure information obtained from the output of the intake pipe pressure sensor is compared with intake air quantity information obtained from the output of the throttle opening sensor, and the intake pipe pressure sensor Intake pipe pressure sensor abnormality diagnosis (hereinafter, these abnormality diagnoses are collectively referred to as “intake system sensor abnormality diagnosis”) by an intake system sensor abnormality diagnosis means When the intake air sensor information obtained from the output of the intake air quantity sensor and the intake air quantity information obtained from the output of the intake pipe pressure sensor satisfy a predetermined condition Intake system sensor abnormality diagnosis is executed.

  If both the intake air amount sensor and the intake pipe pressure sensor are normal, the intake air amount information obtained from the output of the intake air amount sensor and the intake pipe pressure sensor output, regardless of the throttle valve deposit, etc. Since the air amount information is almost the same, depending on whether the comparison result between the intake air amount information obtained from the output of the intake air amount sensor and the intake air amount information obtained from the output of the intake pipe pressure sensor satisfies a predetermined condition. It is possible to determine whether or not both the intake air amount sensor and the intake pipe pressure sensor are normal.

  Therefore, as in the present invention, when the comparison result between the intake air amount information obtained from the output of the intake air amount sensor and the intake air amount information obtained from the output of the intake pipe pressure sensor satisfies a predetermined condition, the intake system sensor If the abnormality diagnosis is executed, the intake system sensor abnormality diagnosis using the throttle opening sensor output is executed only when at least one of the intake air amount sensor and the intake pipe pressure sensor is determined to be abnormal. In this case, that is, when it is determined that both the intake air amount sensor and the intake pipe pressure sensor are normal, the intake system sensor abnormality diagnosis using the throttle opening sensor output can be prohibited. As a result, although both the intake air amount sensor and the intake pipe pressure sensor are normal, the intake air amount sensor and the intake pipe pressure sensor are erroneously diagnosed due to the influence of the throttle valve deposit, etc. Can be prevented, and the reliability of the intake system sensor abnormality diagnosis can be improved.

  In this case, as in claim 2, when the ratio between the intake air amount information obtained from the output of the intake air amount sensor and the intake air amount information obtained from the output of the intake pipe pressure sensor is outside a predetermined range, the intake system sensor It is recommended to perform abnormality diagnosis. The intake air amount depends on whether the ratio of the intake air amount information obtained from the output of the intake air amount sensor and the intake air amount information obtained from the output of the intake pipe pressure sensor is within a predetermined range (for example, 1 or the vicinity thereof). The intake air amount information obtained from the sensor output and the intake air pressure information obtained from the output of the intake pipe pressure sensor are determined with high accuracy, and both the intake air amount sensor and the intake pipe pressure sensor are determined. It is possible to accurately determine whether or not both are normal. Therefore, the intake system sensor abnormality diagnosis is executed when the ratio of the intake air amount information obtained from the output of the intake air amount sensor and the intake air amount information obtained from the output of the intake pipe pressure sensor is outside a predetermined range. For example, when both the intake air amount sensor and the intake pipe pressure sensor are normal, the intake system sensor abnormality diagnosis using the throttle opening sensor output can be reliably prohibited.

  Also, when the intake air amount is small, the output difference between normal and abnormal intake air amount sensor and intake pipe pressure sensor becomes smaller and the influence of the sensor output tolerance (individual difference etc.) increases. The diagnosis accuracy of the intake system sensor abnormality diagnosis is lowered.

  Therefore, as in claim 3, when the intake air amount information obtained from the output of the intake air amount sensor and / or the intake air amount information obtained from the output of the intake pipe pressure sensor is below a predetermined value, the intake system sensor abnormality diagnosis May be prohibited. In this way, when the intake air amount information obtained from the output of the intake air amount sensor or the intake pipe pressure sensor is less than a predetermined value, that is, the intake air amount decreases and the diagnosis accuracy of the intake system sensor abnormality diagnosis decreases. In doing so, the intake system sensor abnormality diagnosis can be prohibited to prevent erroneous diagnosis of whether there is an abnormality in the intake air amount sensor or the intake pipe pressure sensor.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, a schematic configuration of the entire engine control system will be described with reference to FIG. An air cleaner 13 is provided at the most upstream portion of the intake pipe 12 of the engine 11 that is an internal combustion engine, and an air flow meter 14 (intake air amount sensor) for detecting the intake air amount is provided downstream of the air cleaner 13. Yes. A throttle valve 16 whose opening is adjusted by a motor 15 and a throttle opening sensor 17 for detecting the opening (throttle opening) of the throttle valve 16 are provided on the downstream side of the air flow meter 14.

  Further, a surge tank 18 is provided on the downstream side of the throttle valve 16, and an intake pipe pressure sensor 19 for detecting the intake pipe pressure is provided in the surge tank 18. The surge tank 18 is provided with an intake manifold 20 for introducing air into each cylinder of the engine 11, and a fuel injection valve 21 for injecting fuel is attached in the vicinity of the intake port of the intake manifold 20 of each cylinder. Yes. An ignition plug 22 is attached to the cylinder head of the engine 11 for each cylinder, and the air-fuel mixture in the cylinder is ignited by spark discharge of each ignition plug 22.

  On the other hand, the exhaust pipe 23 of the engine 11 is provided with an exhaust gas sensor 24 (air-fuel ratio sensor, oxygen sensor, etc.) for detecting the air-fuel ratio or rich / lean of the exhaust gas. A catalyst 25 such as a three-way catalyst for purifying gas is provided.

  A cooling water temperature sensor 26 that detects the cooling water temperature and a crank angle sensor 27 that outputs a pulse signal each time the crankshaft of the engine 11 rotates a predetermined crank angle are attached to the cylinder block of the engine 11. Based on the output signal of the crank angle sensor 27, the crank angle and the engine speed are detected.

  Outputs of these various sensors are input to an engine control circuit (hereinafter referred to as “ECU”) 28. The ECU 28 is mainly composed of a microcomputer, and executes various engine control programs stored in a built-in ROM (storage medium), so that the fuel injection amount of the fuel injection valve 21 can be changed according to the engine operating state. The ignition timing of the spark plug 22 is controlled.

  Further, the ECU 28 executes an intake system sensor abnormality diagnosis program of FIG. 2 to be described later, thereby executing an air flow meter abnormality diagnosis and an intake pipe pressure sensor abnormality diagnosis.

  In the air flow meter abnormality diagnosis, the intake air amount Maf [g / s: mass flow rate per second] calculated based on the output of the air flow meter 14, the output (throttle opening) of the throttle opening sensor 17 and the engine speed Depending on whether or not the ratio (Maf / Tbf) to the throttle base intake air amount Tbf [g / s] calculated based on the above is within a normal range near 1 [C3 <(Maf / Tbf) <C4] The presence or absence of an abnormality in the meter 14 is diagnosed. Here, C3 <1, C4> 1 are set.

  On the other hand, in the intake pipe pressure sensor abnormality diagnosis, the throttle base calculated based on the intake pipe pressure Map obtained from the output of the intake pipe pressure sensor 19, the output (throttle opening) of the throttle opening sensor 17 and the engine speed. The presence or absence of abnormality of the intake pipe pressure sensor 19 is diagnosed based on whether or not the ratio (Map / Tbp) to the intake pipe pressure Tbp is within a normal range near 1 [C5 <(Map / Tbp) <C6]. Here, C5 <1, C6> 1 are set.

  However, when the deposit amount of the throttle valve 16 increases and the deviation of the detected intake air amount Maf of the air flow meter 14 with respect to the throttle base intake air amount Tbf increases, The air flow meter 14 may be erroneously diagnosed as abnormal. Similarly, when the difference in the detected intake pipe pressure Map of the intake pipe pressure sensor 19 with respect to the throttle base intake pipe pressure Tbp increases due to the increase in the deposit amount of the throttle valve 16, the intake pipe pressure sensor abnormality diagnosis is executed. Then, there is a possibility that the normal intake pipe pressure sensor 19 is erroneously diagnosed as abnormal.

  As a countermeasure, the ECU 28 calculates the intake air amount MafLoad [g / rev: mass flow rate per rotation] calculated based on the output of the air flow meter 14 and the engine rotation speed, the output of the intake pipe pressure sensor 19 and the engine rotation. Depending on whether the ratio (MafLoad / MapLoad) to the intake air amount MapLoad [g / rev] calculated based on the velocity is within a normal range near 1 [C1 <(MafLoad / MapLoad) <C2] It is determined whether both the meter 14 and the intake pipe pressure sensor 19 are normal. Here, C1 <1 and C2> 1 are set. As a result of the above determination, the air flow meter abnormality diagnosis and the intake pipe pressure sensor abnormality diagnosis are executed only when at least one of the air flow meter 14 and the intake pipe pressure sensor 19 is determined to be abnormal. In other cases, that is, the air flow meter 14 and the intake pipe pressure sensor 19 are determined to be normal, the air flow meter abnormality diagnosis and the intake pipe pressure sensor abnormality diagnosis are prohibited.

  As a result, although both the air flow meter 14 and the intake pipe pressure sensor 19 are normal, the air flow meter 14 and the intake pipe pressure sensor 19 are erroneously diagnosed as being abnormal due to the deposit of the throttle valve 16 or the like. To prevent this from happening.

The processing contents of the intake system sensor abnormality diagnosis program of FIG. 2 executed by the ECU 28 will be described below.
The intake system sensor abnormality diagnosis program shown in FIG. 2 is executed at a predetermined cycle while the ECU 28 is powered on, and serves as an intake system sensor abnormality diagnosis means in the claims. When this routine is started, first, at step 101, both the intake air amount MafLoad obtained from the output of the air flow meter 14 and the intake air amount MapLoad obtained from the output of the intake pipe pressure sensor 19 are both equal to or less than the predetermined value Q. Whether or not it is a low intake air amount region is determined depending on whether or not there is.

  Here, the predetermined value Q reduces the output accuracy between when the air flow meter 14 and the intake pipe pressure sensor 19 are normal and abnormal, and decreases the diagnostic accuracy of the air flow meter abnormality diagnosis and the intake pipe pressure sensor abnormality diagnosis. The intake air volume is set.

  The low intake air amount depends on whether at least one of the intake air amount MafLoad obtained from the output of the air flow meter 14 and the intake air amount MapLoad obtained from the output of the intake pipe pressure sensor 19 is equal to or less than a predetermined value Q. You may make it determine whether it is an area | region.

  If it is determined in this step 101 that the region is a low intake air amount region, it is determined that the diagnostic accuracy of the air flow meter abnormality diagnosis or the intake pipe pressure sensor abnormality diagnosis is lowered, and the processing after step 102 is not performed. Then, this program is terminated and the air flow meter abnormality diagnosis and the intake pipe pressure sensor abnormality diagnosis are prohibited.

  On the other hand, if it is determined in step 101 that the region is not in the low intake air amount region, the process proceeds to step 102 where the intake air amount MafLoad obtained from the output of the air flow meter 14 and the output of the intake pipe pressure sensor 19 are obtained. Both the air flow meter 14 and the intake pipe pressure sensor 19 are normal depending on whether the ratio (MafLoad / MapLoad) to the intake air amount MapLoad is within the normal range near [1] [C1 <(MafLoad / MapLoad) <C2]. It is determined whether or not. Here, the lower limit value C1 of the normal range is set to a value slightly smaller than 1, and the upper limit value C2 of the normal range is set to a value slightly larger than 1.

  If it is determined in step 102 that both the air flow meter 14 and the intake pipe pressure sensor 19 are normal, the program is terminated without performing the processing in and after step 103, and the air flow meter abnormality diagnosis and The intake pipe pressure sensor abnormality diagnosis is prohibited. As a result, although both the air flow meter 14 and the intake pipe pressure sensor 19 are normal, the air flow meter 14 and the intake pipe pressure sensor 19 are erroneously diagnosed as being abnormal due to the deposit of the throttle valve 16 or the like. To prevent this from happening.

  On the other hand, if it is determined in step 102 that at least one of the air flow meter 14 and the intake pipe pressure sensor 19 is abnormal, an air flow meter abnormality diagnosis (steps 103 to 106) and an intake pipe pressure sensor abnormality diagnosis (step) 107 to 110) are executed as follows.

  In the air flow meter abnormality diagnosis, first, in step 103, the throttle base intake air amount Tbf corresponding to the current throttle opening and engine speed is calculated with reference to the map of the throttle base intake air amount Tbf shown in FIG. To do. The map of the throttle base intake air amount Tbf in FIG. 3 is created in advance using the relationship between the throttle opening, the engine speed, and the intake air amount obtained based on experimental data, design data, and the like. Is remembered.

  After this, the routine proceeds to step 104 where the ratio (Maf / Tbf) between the intake air amount Maf obtained from the output of the air flow meter 14 and the throttle base intake air amount Tbf is within a normal range near 1 [C3 <(Maf / Tbf). It is determined whether or not <C4]. Here, the lower limit value C3 of the normal range is set to a value slightly smaller than 1, and the upper limit value C4 of the normal range is set to a value slightly larger than 1.

  If it is determined in step 104 that the ratio between the intake air amount Maf obtained from the output of the air flow meter 14 and the throttle base intake air amount Tbf is within the normal range, the process proceeds to step 105 where the air flow meter 14 It is determined that there is no abnormality (normal).

  On the other hand, if it is determined in step 104 that the ratio between the intake air amount Maf obtained from the output of the air flow meter 14 and the throttle base intake air amount Tbf is outside the normal range, the process proceeds to step 106. The air flow meter 14 is determined to be abnormal.

  On the other hand, in the intake pipe pressure sensor abnormality diagnosis, first, in step 107, the throttle base intake pipe corresponding to the current throttle opening and engine speed is referred to by referring to the map of the throttle base intake pipe pressure Tbp shown in FIG. The pressure Tbp is calculated. The map of the throttle base intake pipe pressure Tbp in FIG. 4 is created in advance using the relationship between the throttle opening, the engine speed, and the intake pipe pressure obtained based on experimental data, design data, and the like. Is remembered.

  After this, the routine proceeds to step 108, where the ratio (Map / Tbp) between the intake pipe pressure Map obtained from the output of the intake pipe pressure sensor 19 and the throttle base intake pipe pressure Tbp is within a normal range around 1 [C5 <(Map / It is determined whether or not Tbp) <C6]. Here, the lower limit value C5 of the normal range is set to a value slightly smaller than 1, and the upper limit value C6 of the normal range is set to a value slightly larger than 1.

  If it is determined in step 108 that the ratio of the intake pipe pressure Map obtained from the output of the intake pipe pressure sensor 19 and the throttle base intake pipe pressure Tbp is within the normal range, the routine proceeds to step 109, where the intake pipe It is determined that the pressure sensor 19 is not abnormal (normal).

  On the other hand, if it is determined in step 108 that the ratio between the intake pipe pressure Map obtained from the output of the intake pipe pressure sensor 19 and the throttle base intake pipe pressure Tbp is outside the normal range, step 110 is performed. Then, it is determined that the intake pipe pressure sensor 19 is abnormal.

  If it is determined in step 106 that there is an abnormality in the air flow meter 14, or if it is determined in step 110 that there is an abnormality in the intake pipe pressure sensor 19, it is provided on the instrument panel in the driver's seat. A warning lamp (not shown) is turned on, or a warning is displayed on a warning display (not shown) on the instrument panel of the driver's seat to warn the driver, and abnormality information (abnormal code, etc.) is displayed. The data is stored in a rewritable nonvolatile memory such as a backup RAM (not shown) of the ECU 28.

  In the present embodiment described above, the air flow depends on whether the ratio of the intake air amount MafLoad obtained from the output of the air flow meter 14 and the intake air amount MapLoad obtained from the output of the intake pipe pressure sensor 19 is within the normal range. It is determined whether both the meter 14 and the intake pipe pressure sensor 19 are normal, and when it is determined that both the air flow meter 14 and the intake pipe pressure sensor 19 are normal, the output of the throttle opening sensor 17 The air flow meter abnormality diagnosis and the intake pipe pressure sensor abnormality diagnosis using the are prohibited. Thus, although both the air flow meter 14 and the intake pipe pressure sensor 19 are normal, the air flow meter 14 and the intake pipe pressure sensor 19 are erroneously diagnosed as being abnormal due to the influence of the deposit of the throttle valve 16 or the like. This can be prevented and the abnormality diagnosis accuracy of the air flow meter 14 and the intake pipe pressure sensor 19 can be improved.

  Further, when the intake air amount is small, the output difference between the normal time and the abnormal time of the air flow meter 14 and the intake pipe pressure sensor 19 becomes small, and the influence of the sensor output tolerance (individual difference or the like) becomes large. The diagnostic accuracy of the air flow meter abnormality diagnosis and the intake pipe pressure sensor abnormality diagnosis is lowered, and the possibility of erroneous diagnosis of whether the air flow meter 14 and the intake pipe pressure sensor 19 are abnormal is increased.

  In consideration of this point, in this embodiment, the intake air amount MafLoad obtained from the output of the air flow meter 14 and the intake air amount MapLoad obtained from the output of the intake pipe pressure sensor 19 are determined depending on whether or not the predetermined value Q or less. The air flow meter abnormality diagnosis and the intake pipe pressure sensor abnormality diagnosis are prohibited when it is determined whether or not it is in the low intake air amount region. When the amount decreases and the diagnostic accuracy of the air flow meter abnormality diagnosis and the intake pipe pressure sensor abnormality diagnosis decreases, the air flow meter abnormality diagnosis and the intake pipe pressure sensor abnormality diagnosis are prohibited, and the air flow meter 14 and the intake pipe pressure sensor 19 are prohibited. It is possible to prevent erroneous diagnosis of the presence or absence of abnormalities.

  In the above embodiment, depending on whether or not the ratio of the intake air amount obtained from the output of the air flow meter 14 and the intake air amount obtained from the output of the intake pipe pressure sensor 19 is within the normal range, Although it is determined whether or not the intake pipe pressure sensor 19 is both normal, the difference between the intake air amount obtained from the output of the air flow meter 14 and the intake air quantity obtained from the output of the intake pipe pressure sensor 19 is in a normal range. It may be determined whether or not both the air flow meter 14 and the intake pipe pressure sensor 19 are normal depending on whether or not they are within the range.

  In the above embodiment, the present invention is applied to a system that performs both an air flow meter abnormality diagnosis using the throttle opening sensor output and an intake pipe pressure sensor abnormality diagnosis using the throttle opening sensor output. The present invention may be applied to a system that performs only one of an air flow meter abnormality diagnosis using a degree sensor output and an intake pipe pressure sensor abnormality diagnosis using a throttle opening sensor output.

  In the present invention, it is needless to say that the air flow meter abnormality diagnosis method using the throttle opening sensor output and the intake pipe pressure sensor abnormality diagnosis method using the throttle opening sensor output may be appropriately changed. Yes.

It is a schematic block diagram of the whole engine control system in one Example of this invention. It is a flowchart which shows the flow of a process of an intake system sensor abnormality diagnosis program. It is a figure which shows notionally an example of the map of throttle base intake air amount Tbf. It is a figure which shows notionally an example of the map of throttle base intake pipe pressure Tbp.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Engine (internal combustion engine), 12 ... Intake pipe, 14 ... Air flow meter (intake air amount sensor), 16 ... Throttle valve, 17 ... Throttle opening sensor, 19 ... Intake pipe pressure sensor, 21 ... Fuel injection valve, 22 ... Spark plug, 23 ... Exhaust pipe, 28 ... ECU (Intake system sensor abnormality diagnosis means)

Claims (3)

Applied to a system including an intake air amount sensor for detecting an intake air amount of an internal combustion engine, an intake pipe pressure sensor for detecting an intake pipe pressure, and a throttle opening sensor for detecting a throttle opening;
An intake air amount sensor for diagnosing whether there is an abnormality in the intake air amount sensor by comparing intake air amount information obtained from the output of the intake air amount sensor and intake air amount information obtained from the output of the throttle opening sensor Diagnose whether there is an abnormality in the intake pipe pressure sensor by comparing the intake air amount information obtained from the abnormality diagnosis and / or the output of the intake pipe pressure sensor and the intake air amount information obtained from the output of the throttle opening sensor. An abnormality diagnosis device for an intake system sensor comprising an intake system sensor abnormality diagnosis means for performing an intake pipe pressure sensor abnormality diagnosis (hereinafter, these abnormality diagnoses are collectively referred to as “intake system sensor abnormality diagnosis”),
The intake system sensor abnormality diagnosing means is configured so that a comparison result between the intake air amount information obtained from the output of the intake air amount sensor and the intake air amount information obtained from the output of the intake pipe pressure sensor satisfies a predetermined condition. An abnormality diagnosis apparatus for an intake system sensor that performs the intake system sensor abnormality diagnosis.   The intake system sensor abnormality diagnosing means is configured to detect the intake air when a ratio between intake air amount information obtained from the output of the intake air amount sensor and intake air amount information obtained from the output of the intake pipe pressure sensor is outside a predetermined range. An abnormality diagnosis apparatus for an intake system sensor according to claim 1, wherein an abnormality diagnosis for the system sensor is executed.   The intake system sensor abnormality diagnosing means is configured such that the intake air amount information obtained from the output of the intake air amount sensor and / or the intake air amount information obtained from the output of the intake pipe pressure sensor is equal to or less than a predetermined value. The abnormality diagnosis apparatus for an intake system sensor according to claim 1 or 2, wherein sensor abnormality diagnosis is prohibited.

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