JP2017115683A - Throttle diagnosis device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throttle diagnosis device capable of preventing in advance an erroneous diagnosis caused by freezing in the case of abnormal state diagnosis of a throttle driving device against its biasing member.SOLUTION: A throttle diagnosis device 50 performs an abnormal state diagnosis for a biasing member 30 on the basis of time required for a throttle valve 20 to change from its operating position to a diagnosing position by a biasing member after ignition-off state. This throttle diagnosis device 50 stores an opening or closing operation of the throttle valve 20 performed by a driving part 65 after an ignition-on state and judges whether or not the abnormal state diagnosis is carried out on the basis of the stored times of the opening or closing operations after an ignition-off state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a throttle abnormality diagnosis device that performs abnormality diagnosis on an electronically controlled throttle drive device, and in particular, performs abnormality diagnosis on an urging member that urges a throttle valve in one of opening and closing directions. The present invention relates to a throttle diagnosis device.

  2. Description of the Related Art A throttle diagnosis device that performs an abnormality diagnosis of an urging member on an electronically controlled throttle drive device after ignition is turned off is known (for example, see Patent Document 1). The urging member is a member for positioning the throttle valve. For example, the urging member returns the throttle valve to a predetermined opening degree when the ignition is off. In the abnormality diagnosis, first, after the throttle valve is opened to a predetermined opening by the drive unit, power supply to the drive unit is stopped. Then, the throttle valve is returned to the determination position by the urging force of the urging member, and at this time, the time required for a certain degree of opening change is measured, and whether the urging member is functioning normally based on the measurement result Determine whether or not.

JP-A-11-229943

  If the temperature around the throttle valve changes after the vehicle travels, condensation occurs on the throttle valve. At that time, if the throttle is 0 ° C. or less, the condensed water generated on the surface of the throttle valve is frozen. For example, an electronically controlled throttle drive device employs a type that eliminates the hot water passage for cost reduction. In a throttle drive device that does not have a hot water path, the throttle valve is cooled after traveling at an extremely low temperature. In this state, the combustion gas existing downstream of the throttle after the engine is stopped is cooled by the throttle valve, and the combustion gas Freezing occurs due to condensation of water inside. Even when the vehicle is stopped in a garage or the like having a relatively high ambient temperature, the outside air is cooled by the throttle valve due to intrusion into the throttle valve, and moisture in the outside air is condensed and frozen. Furthermore, even in a throttle drive device having a hot water passage, when the vehicle is stopped in a garage or the like where the ambient temperature is relatively high before the water temperature rises at an extremely low temperature, the outside air is throttled by the intrusion of outside air into the throttle section. There is a case where a phenomenon occurs in which water in the outside air is condensed and the moisture in the outside air is condensed and frozen. When condensed water freezes, the drive resistance of the throttle valve is increased. If the drive resistance of the throttle valve due to freezing increases, the time required for the throttle valve by the urging member to return to the determination position becomes longer, and there is a risk of erroneous diagnosis as an abnormality at the time of abnormality diagnosis.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a throttle diagnosis device capable of preventing erroneous diagnosis due to freezing in abnormality diagnosis for an urging member of a throttle drive device.

  In order to solve the above-described problems, the present invention provides a throttle drive device having a throttle valve, a drive unit that opens and closes the throttle valve, and a biasing member that biases the throttle valve to a predetermined reference opening. A throttle diagnosis device that is applied and performs an abnormality diagnosis of the biasing member based on a time until the throttle valve changes from an operating position to a determination position by the biasing member after the ignition is turned off. Later, the abnormality diagnosis is performed based on the number of times of opening / closing operation stored in the operation number storage unit after the ignition is turned off, and an operation number storage unit that stores the opening / closing operation of the throttle valve by the drive unit. And a determination unit that switches between implementation and non-execution.

  After the ignition is turned on, the opening / closing operation of the throttle valve by the drive unit is repeated, so that even if the throttle valve is frozen, the freezing of the throttle valve is weakened, and the operating resistance of the throttle valve that causes a misdiagnosis can be reduced. it can. Therefore, in the present invention, the operation number storage unit stores the opening / closing operation of the throttle valve, which becomes a factor that weakens the operation resistance due to freezing after the ignition is turned on. Then, after the ignition is turned off, the determination unit determines whether the operation resistance is weakened due to the above-described freezing based on the number of opening / closing operations stored in the operation number storage unit, and determines whether or not the abnormality diagnosis is performed. . For example, if the number of opening / closing operations of the throttle valve is equal to or greater than a predetermined number, it is determined that the operation resistance due to freezing of the throttle valve is weak and there is no fear of abnormality diagnosis. On the other hand, if the number of opening / closing operations of the throttle valve is less than the predetermined number, it is determined that there is a possibility of abnormality diagnosis. As a result, it is possible to prevent erroneous diagnosis due to freezing of the throttle valve.

The figure which shows the structure of the intake system 100 which concerns on this embodiment. The figure explaining the process implemented according to ON and OFF of IG switch 66. FIG. The flowchart explaining abnormality diagnosis. The flowchart explaining the memory | storage of the frequency | count of opening / closing operation | movement. The figure explaining the throttle opening which becomes a memory | storage object. The flowchart which shows determination of the diagnostic conditions implemented by ECU50. The figure explaining the relationship between environmental temperature DE and threshold value TW. The figure explaining the determination of the implementation condition which concerns on 2nd Embodiment.

  Embodiments according to the present invention will be described with reference to the drawings. In the following, as an example, a throttle drive device incorporated in the middle of an intake passage of an engine having a plurality of cylinders (internal combustion engine), and a throttle diagnosis device (electronic control unit: ECU) that performs abnormality diagnosis on the throttle drive device ) Will be described using an intake system. In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings, and the description of the same reference numerals is used.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration of an intake system 100 according to the present embodiment. The intake system 100 mainly includes the throttle drive device 10, the ECU 50, and various sensors as described above.

  First, the configuration of the throttle drive device 10 will be described. The throttle drive device 10 mainly includes a throttle body 11, a throttle valve 20, a return spring 30, a reduction gear 40, and a drive motor 45. In this embodiment, the return spring 30 functions as a biasing member.

  The throttle body 11 is integrally formed with a cylindrical intake duct (cylindrical portion) 16 incorporated in the middle of the intake pipe of the engine. Inside the intake duct 16, there is formed a throttle bore 17 having a circular cross section that is an intake passage that communicates with the combustion chamber of each cylinder of the engine and through which intake air that has passed through the air cleaner flows.

  Further, the throttle body 11 is integrally formed with a gear case 13 and a motor case 12 which are housing portions for housing members. The throttle body 11 is formed in a predetermined shape from metal or synthetic resin.

  A throttle valve 20 is rotatably attached to the intake duct 16 of the throttle body 11. The throttle valve 20 includes a valve body 21 that regulates the flow rate of intake air that has passed through the air cleaner, and a shaft portion 22 that is fixed to the valve body 21.

  The valve body 21 has a disk shape having an outer diameter slightly smaller than the inner diameter of the throttle bore 17, and a shaft portion 22 is fixed at the center with both end portions protruding. Both end portions of the valve body 21 are supported by bearings 23 and 23 press-fitted into the intake duct 16 so as to be rotatable in the axial direction.

  A return spring 30 and a reduction gear 40 are mainly accommodated in the gear case 13 of the throttle body 11. Further, the end portion of the shaft portion 22 protrudes from the gear case 13.

  The return spring 30 applies a biasing force that biases the valve body 21 to a predetermined intermediate opening (reference opening). The return spring 30 is engaged with the shaft portion 22 of the valve body 21 via an opener member 31 accommodated in the gear case 13. In FIG. 1, the opener member 31 is a flange member coupled to the end portion of the shaft portion 22 protruding from the gear case 13, and can rotate together with the shaft portion 22. The opener member 31 is engaged with one end of the return spring 30 in a state where the cylindrical portion is inserted inside the return spring 30. In a steady state where no driving force is generated by the drive motor 45, the throttle valve 20 is held at an intermediate opening in the throttle bore 17 by the urging force of the return spring 30.

  The intermediate opening that is the reference opening is, for example, the position of the valve body 21 when the valve body 21 shields the throttle bore 17 as shown in FIG. In addition to this, the reference opening may be a fully closed position or a fully opened position of the valve body 21.

  The reduction gear 40 includes a plurality of gears having different gear ratios, and transmits the rotational force of the drive motor 45 to the throttle valve 20. The reduction gear 40 is interposed between the output gear 41 integrated with the opener member 31, the pinion gear 42 attached to the output shaft of the drive motor 45, and the pinion gear 42 and the output gear 41. And an intermediate gear 43 that decelerates the rotation speed [rpm] and transmits it to the output gear 41.

  A drive motor 45 that functions as a drive unit is accommodated in the motor case 12 of the throttle body 11. When the drive motor 45 rotates the pinion gear 42, the output gear 41 is rotated via the intermediate gear 43, and the position of the throttle valve 20 is operated between the fully open position and the fully closed position. The drive motor 45 is electrically connected to a battery 70 mounted on the vehicle via a motor drive circuit 55 that is electronically controlled by the ECU 50.

  Next, the ECU 50 and the sensor group connected to the ECU 50 will be described. The ECU 50 variably controls the throttle opening in accordance with the engine operating status (for example, the amount of depression of the accelerator pedal, the accelerator opening). The ECU 50 is a microcomputer having a known structure including functions of a CPU, a memory (ROM and RAM), an input circuit (input unit), an output circuit (output unit), a power supply circuit, a timer circuit, and the like.

  The ECU 50 is connected to a motor drive circuit 55 that controls energization to the drive motor 45. The motor drive circuit 55 variably controls the power supplied to the internal conductor (armature coil) of the drive motor 45 with respect to a control signal (for example, the duty ratio of the PWM signal) given from the ECU 50.

  A sensor group that detects the state of the vehicle and the throttle opening of the throttle valve 20 is connected to the ECU 50. In FIG. 1, an air flow meter 61, a crank angle sensor 62, an accelerator opening sensor 63, a throttle opening sensor 64, a temperature sensor 65, and an IG switch (ignition switch) 66 are connected as a sensor group.

  The ECU 50 determines the operating state of the engine based on outputs from the air flow meter 61, the crank angle sensor 62, and the accelerator opening sensor, for example. Further, the ECU 50 calculates a target throttle opening based on an accelerator opening signal that is an output signal of the accelerator opening sensor 63, and a deviation between the actual throttle opening detected by the throttle opening sensor 64 and the target throttle opening. The power supplied to the drive motor 45 is feedback-controlled so as to eliminate this.

  The throttle opening sensor 64 detects the rotation angle of the shaft portion 22 and outputs it to the ECU 50. The throttle opening sensor 64 is configured by, for example, a magnetic sensor that detects a magnetic flux density that changes according to the rotation of the shaft portion 22. In FIG. 1, the throttle opening sensor 64 is installed in the cylindrical boss of the opener member 31 (output gear 41) in the gear case 13, and outputs a change in the magnetic field accompanying the rotation of the shaft portion 22 to the ECU 50. . The ECU 50 acquires the throttle opening corresponding to the rotation angle of the throttle valve 20 based on the output from the throttle opening sensor 64.

  The temperature sensor 65 outputs a value corresponding to the environmental temperature DE of the engine to the ECU 50. The environmental temperature DE acquired by the temperature sensor 65 is the outside air temperature, the temperature around the engine, the temperature of the engine body air, the water temperature of the engine, and the like.

  The IG switch 66 switches the power supply from the battery 70 to the vehicle. The IG switch 66 is connected to a main relay 67 that connects the battery 70 and a load circuit including the ECU 50. For example, when the driver turns on the IG switch 66 (ignition on), the main relay 67 is turned on, and energization from the battery 70 to the ECU 50 is performed. On the other hand, when the driver turns off the IG switch 66 (ignition off), the main relay 67 is turned off after a predetermined period of time, and the power supply from the battery 70 to the ECU 50 is cut off.

  The ECU 50 performs an abnormality diagnosis for diagnosing the return spring 30 after the IG switch 66 is turned off. FIG. 2 is a diagram for explaining processing performed in response to the ON operation and OFF operation of the IG switch 66.

  In the abnormality diagnosis, the drive motor 45 operates the return spring 30 to a predetermined target opening (operation position), and then the drive motor 45 is de-energized. Therefore, the throttle valve 20 operates from the target opening to the intermediate opening by the urging force of the return spring 30. At this time, the ECU 50 acquires the time (acquisition time AT) required for the throttle valve 20 to operate from the target opening to the determination opening S / L (determination position). If the urging force of the return spring 30 is normal, the acquisition time AT is shorter than a predetermined determination time. On the other hand, if the urging force of the return spring 30 is abnormal, the acquisition time AT is longer than the determination time. Therefore, the ECU 50 compares the acquisition time AT with the determination time and diagnoses the urging force of the return spring 30.

  In FIG. 2, the determination opening is set as a value between the target opening and the intermediate opening. In addition to this, the determination opening may be set to an intermediate opening.

  In the abnormality diagnosis shown in FIG. 2 described above, the return spring 30 may be erroneously determined to be abnormal due to the freezing of the throttle valve 20. For example, when the engine changes from a high temperature to a low temperature due to IG off, condensation occurs in the throttle valve 20, but when the condensed water is frozen by outside air, the operating resistance of the throttle valve 20 is increased. Since the operating resistance of the throttle valve 20 is increased, the urging force of the return spring 30 increases the acquisition time AT required for the throttle valve 20 to operate to the determination opening degree S / L. May be misdiagnosed as abnormal. Further, at the time of abnormality diagnosis, since the drive motor 45 can change the throttle valve 20 to the target opening degree by the torque due to power supply, it is difficult to determine a wrong diagnosis.

  Therefore, in this embodiment, the ECU 50 predicts the possibility of erroneous determination due to freezing of the throttle valve 20, and avoids performing abnormality diagnosis when there is a high possibility of erroneous determination. Thereby, it is possible to prevent erroneous determination of the return spring 30 that has been frozen.

  Next, an abnormality diagnosis method performed by the intake system 100 will be described. FIG. 3 is a flowchart for explaining processing associated with abnormality diagnosis. The process shown in FIG. 3 is a process performed by the ECU 50 after the operation of the IG switch 66 (IG off).

  In step S11, it is determined whether or not the IG switch 66 has been turned off after being turned on. When the IG switch 66 is ON (step S11: NO), the routine proceeds to step S12, and the drive motor 45 is normally controlled so that the throttle opening of the throttle valve 20 becomes an opening corresponding to the opening of the accelerator pedal or the like. Control is executed.

  On the other hand, when the IG switch 66 is kept ON (step S11: YES), in step S13, it is determined whether or not a diagnosis condition for performing an abnormality diagnosis is satisfied. The diagnosis condition is a condition for the ECU 50 to determine whether or not to perform abnormality diagnosis. Details of step S13 will be described later.

  If the diagnosis condition is not satisfied (step S13: NO), the process is terminated without performing abnormality diagnosis. On the other hand, when the diagnosis condition is satisfied (step S13: YES), the process proceeds to step S14, and abnormality diagnosis is performed on the return spring 30. In the abnormality diagnosis, as shown in FIG. 2, after the throttle valve 20 is operated to the target opening, the time required for the throttle valve 20 to return to the determination opening S / L by the urging force of the return spring 30 is determined. .

  If the return spring 30 is diagnosed as normal (step S15: NO), the process is terminated. On the other hand, when the return spring 30 is diagnosed as abnormal (step S15: YES), the abnormality is stored in step S16. Then, the process ends. The abnormality determination stored in step S16 may be notified next when the IG switch 66 is turned on.

  Next, prior to describing the determination of the diagnostic condition in step S13 of FIG. 2, a method of acquiring the number of opening / closing operations used in the determination of the diagnostic condition will be described. FIG. 4 is a flowchart for explaining storage of the number of times of opening / closing the throttle valve 20. The process shown in FIG. 4 is a process executed by the ECU 50 every time the driver operates the accelerator pedal in step S12 after the IG is turned on, for example. By the processing shown in FIG. 4, the ECU 50 functions as an operation count storage unit. FIG. 5 is a diagram for explaining the throttle opening that is to be stored.

  In step S21, the magnitude of change in the throttle opening is determined. For example, the ECU 50 determines a throttle operation in which a predetermined opening change occurs based on a time-series change in the output from the throttle opening sensor 64. For example, the ECU 50 determines that the throttle operation that causes a predetermined amount of opening change (throttle opening change SVA) from the intermediate opening is that the throttle opening is large. The throttle opening change SVA is a value that can sufficiently reduce the operating resistance accompanying freezing of the throttle valve 20 by reliably sliding the shaft portion 22 of the throttle valve 20 by a predetermined amount.

  When the change in the throttle opening is large (step S21: YES), in step S22, the number of operations WC is stored and the process is terminated. In this embodiment, the ECU 50 includes a history that stores the number of times of operation WC, and updates this history according to the determination result in step S21. Therefore, every time the accelerator pedal is operated in the period from IG ON to IG OFF, the ECU 50 performs the determination shown in FIG. 4 and stores the number of operations WC according to the determination result.

  Next, diagnosis condition determination using the operation count WC stored by the ECU 50 will be described. FIG. 6 is a flowchart showing determination of diagnostic conditions performed by the ECU 50, and is a process performed in step S13 of FIG. The ECU 50 functions as a determination unit by the processing shown in FIG.

  In step S31, it is determined whether the execution condition is satisfied. The implementation condition is a condition for performing an abnormality diagnosis, and is a condition for indirectly determining that the throttle valve 20 is not frozen. In the first embodiment, the ECU 50 acquires the environmental temperature DE based on the output from the temperature sensor 65, and determines whether the acquired environmental temperature DE is higher than the threshold value TD. The threshold value TD is a temperature at which condensation water is frozen, and for example, a value of 0 [° C.] or less can be used. Therefore, ECU50 implement | achieves a detection part by the process of step S31.

  If the execution condition is satisfied (step S31: YES), the process proceeds to step S34 to determine whether the condition is satisfied. That is, since the ECU 50 can determine that the throttle valve 20 is not frozen based on the environmental temperature DE, the ECU 50 permits abnormality diagnosis.

  On the other hand, if the execution condition is not satisfied (step S31: NO), the process proceeds to step S32, and a determination threshold value TW for determining the number of operations WC based on the environmental temperature DE is set. FIG. 7 is a diagram illustrating the relationship between the environmental temperature DE and the determination threshold value TW. In this embodiment, when the environmental temperature DE is equal to or lower than a threshold value TD (for example, 0 [° C.]), the determination threshold value TW is changed so that the operation frequency WC increases as the environmental temperature DE decreases.

  In FIG. 7, the determination threshold is monotonously increased when the environmental temperature DE becomes lower than the determination threshold TD. However, the present invention is not limited to this, and may be increased stepwise. .

  Returning to FIG. 6, in step S33, the stored operation count WC is determined. The ECU 50 determines whether or not the operation resistance due to freezing is reduced by comparing the number of operations WC stored in the history with the determination threshold value TW set in step S32.

  If the operation count WC is equal to or greater than the determination threshold value TW (step S33: YES), the process proceeds to step S34, and the condition is determined. That is, the ECU 50 determines that the operating resistance due to the freezing of the throttle valve 20 has been reduced before the IG is turned off, and permits abnormality diagnosis.

  If the number of operations WC is less than the determination threshold TW (step S33: NO), the process proceeds to step S35, where the condition is not satisfied. That is, it is determined that the operating resistance due to the freezing of the throttle valve 20 has not been reduced before the IG is turned off, and abnormality diagnosis is not permitted.

  Then, in step S14 in FIG. 3, the abnormality diagnosis is performed or not performed according to the determination results in steps S34 and S35 in FIG.

  As described above, in this embodiment, the ECU 50 (operation number storage unit) stores the opening / closing operation of the throttle valve 20 that causes the operation resistance of the throttle valve 20 to be weakened by freezing after the IG is turned on. Then, after the IG is turned off, the ECU 50 (determination unit) determines whether or not the throttle valve 20 is frozen based on the stored number of opening / closing operations, and switches whether or not the abnormality diagnosis is performed. As a result, it is possible to prevent erroneous diagnosis of the throttle valve 20 due to freezing.

  The ECU 50 (operation frequency storage unit) stores an opening / closing operation in which the amount of change in the throttle opening is equal to or greater than a predetermined amount. The opening / closing operation in which the amount of change in the throttle opening is greater than or equal to the predetermined amount has a high degree of weakening the operating resistance due to freezing, and whether or not to perform abnormality diagnosis by using the number of such opening / closing operations for determination The determination can be made appropriately, and as a result, the determination accuracy of establishment of the diagnosis condition can be increased.

  A detection unit (S31) that detects the environmental temperature of the engine, and the ECU 50 (determination unit) performs abnormality diagnosis based on the stored number of opening / closing operations when the environmental temperature is equal to or lower than a predetermined temperature. To determine whether or not to implement. Since the abnormality diagnosis is for diagnosing an abnormality of the return spring 30, it is desirable to carry out the abnormality diagnosis as much as possible. Here, if the temperature of the engine is high, the possibility that the throttle valve 20 is frozen is low. Therefore, if the environmental temperature DE of the engine is equal to or higher than the predetermined temperature, it is possible to increase the chance of performing the abnormality diagnosis by performing the abnormality diagnosis.

  -ECU50 (determination part) changes the frequency | count of the opening / closing operation referred as a case where abnormality diagnosis is not implemented based on the detected environmental temperature DE of the engine. By changing the number of opening / closing operations referred to by the ECU 50 in accordance with the environmental temperature DE, priority is given to not performing abnormality diagnosis at the environmental temperature DE at which misdiagnosis is likely to occur, and environmental temperature DE at which erroneous diagnosis is less likely to occur. Then, it is possible to prioritize the execution of abnormality diagnosis. As a result, the ECU 50 can appropriately balance the execution of the abnormality diagnosis and the prevention of erroneous diagnosis.

(Second Embodiment)
The execution condition in step S31 of FIG. 6 may use the length of the period during which the engine is stopped. FIG. 8 is a diagram for explaining determination of execution conditions according to the second embodiment.

  If the period during which the engine is stopped (for example, soak time) is long, the environmental temperature DE decreases, and the possibility that the condensed water generated in the throttle valve 20 will freeze increases. On the other hand, if the period in which the engine is stopped is short, the amount of decrease in the environmental temperature DE is low, and the condensed water generated in the throttle valve 20 is difficult to freeze. Therefore, in step S31 of FIG. 6, in addition to the condition that the environmental temperature DE becomes a predetermined temperature (for example, 0 ° C.), the period during which the engine is stopped is added to the determination condition to determine whether the execution condition is satisfied. For example, the ECU 50 receives an output from a known soak timer and determines a period during which the engine is stopped.

  -With the above configuration, the number of times that the abnormality diagnosis is performed is increased by adding the time during which the engine is stopped when the IG is turned on to the determination condition as to whether or not to perform the abnormality diagnosis. Can be increased.

(Other embodiments)
The use of the change amount of the throttle opening as the opening / closing operation condition stored in the ECU 50 is merely an example. For example, the ECU 50 may monitor the throttle opening at a predetermined cycle and determine a change in the throttle opening based on the maximum value of the throttle opening.

  The use of the return spring 30 as an urging member is merely an example, and any member may be used as long as it is a member that applies an urging force to the throttle valve 20.

  20 ... throttle valve, 30 ... return spring, 45 ... drive motor, 50 ... ECU.

Claims (5)

A throttle drive device (10) having a throttle valve (20), a drive unit (45) for opening and closing the throttle valve, and a biasing member (30) for biasing the throttle valve to a predetermined reference opening And a throttle diagnosis device (50) for performing an abnormality diagnosis of the urging member based on a time until the throttle valve changes from an operating position to a determination position by the urging member after the ignition is turned off. And
An operation number storage unit (S25) for storing the number of times of opening and closing the throttle valve by the drive unit after the ignition is turned on;
After the ignition is turned off, a throttle having a determination unit (S33, S34, S35) for determining whether or not to perform the abnormality diagnosis based on the number of opening / closing operations stored in the operation number storage unit Diagnostic device.   2. The throttle diagnosis device according to claim 1, wherein the operation number storage unit stores the number of times of the opening / closing operation in which a change amount of a throttle opening in the throttle valve is equal to or greater than a predetermined amount. A detector (S31) for detecting the environmental temperature of the internal combustion engine;
The said determination part determines whether the said abnormality diagnosis is implemented based on the frequency | count of the said opening / closing operation | movement memorize | stored in the said operation frequency memory | storage part, when the said environmental temperature is below predetermined temperature. The throttle diagnosis device according to claim 1 or 2.   The throttle diagnosis device according to claim 3, wherein a determination value of the number of times for determining whether or not to perform the abnormality diagnosis is changed based on the detected environmental temperature.   Whether or not the determination unit performs the abnormality diagnosis based on the number of opening / closing operations stored in the operation number storage unit when the stop period of the internal combustion engine after the ignition is turned on is a predetermined time or more. The throttle diagnosis device according to any one of claims 1 to 4, wherein

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