JP2007085283A - Abnormality diagnosis device for vehicle drive system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform an abnormality diagnosis which suits driver's sensitivity while securing the responsiveness of abnormality detection, in the abnormality diagnosis of a vehicle drive system. <P>SOLUTION: The actual drive torque Tt of a driving wheel is calculated based on information about the behavior of a torque converter 31 such as a capacity coefficient of the torque converter 31, the target drive torque Tr of a driving wheel is calculated based on an accelerator operation amount, and the actual drive torque Tt is compared with the target drive torque Tr to determine the presence/absence of an abnormality of the vehicle drive system. Therefore, the responsiveness of abnormality detection is improved in the case that there is any abnormality on an engine 11 side, compared with an abnormality diagnosis based on vehicle behavior information, the abnormality can be detected before the behavior of the vehicle is brought into in an abnormal state, and the abnormality diagnosis suits the driver's sensitivity compared with the abnormality diagnosis based on engine behavior information. Even while a brake is operated, the presence/absence of the abnormality is accurately determined. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention controls the throttle opening of an internal combustion engine based on an accelerator operation amount, and diagnoses whether there is an abnormality in a vehicle drive system that transmits the output of the internal combustion engine to drive wheels via an automatic transmission having a torque converter. The present invention relates to an abnormality diagnosis device for a vehicle drive system.

  In recent years, some internal combustion engines mounted on vehicles employ an electronic throttle control device. This electronic throttle control device includes a throttle actuator such as a motor that adjusts the throttle valve opening (throttle opening), calculates a target throttle opening based on an accelerator operation amount, and detects an actual value detected by a throttle opening sensor. By controlling the throttle actuator so that the throttle opening matches the target throttle opening, the output of the internal combustion engine is controlled according to the accelerator operation amount of the driver.

  In a system equipped with this electronic throttle control device, as described in Patent Document 1 (US Pat. No. 5,987,372), the target torque is calculated based on the accelerator operation amount, and the actual torque is calculated based on the wheel speed. There is one in which the torque is calculated and the presence / absence of an abnormality is determined based on whether or not the deviation between the target torque and the actual torque is larger than a determination value.

Further, as described in Patent Document 2 (Japanese Patent Application Laid-Open No. 6-241105), the maximum load corresponding to the accelerator operation amount is calculated, and the rotational speed and intake air amount (or intake pipe pressure) of the internal combustion engine are calculated. In some cases, the actual load is calculated based on the above and a failure is determined when the actual load reaches or exceeds the maximum load.
US Pat. No. 5,987,372 JP-A-6-241105

  By the way, in the abnormality diagnosis of the above-mentioned patent document 1, since the actual torque based on the wheel speed, that is, information reflecting the behavior of the vehicle that the driver actually feels is used, the abnormality diagnosis that matches the driver's sensitivity is performed. On the other hand, even if an abnormality occurs in the behavior of the internal combustion engine, the abnormality is not transmitted until the effect is transmitted to the drive wheels via the automatic transmission or the like and appears in the behavior of the vehicle. There is a drawback that it cannot be detected and the response of abnormality detection is poor. In addition, when the driver senses the occurrence of an abnormality and activates the brake or when an abnormality occurs during the operation of the brake, abnormal vehicle behavior (abnormal acceleration, etc.) is suppressed by the braking force of the brake. Therefore, there is a drawback that it is difficult to detect an abnormality.

  Further, in the abnormality diagnosis of Patent Document 2, since the actual load calculated based on the rotational speed of the internal combustion engine, the intake air amount, and the like, that is, information reflecting the behavior of the internal combustion engine is used, there is an abnormality in the behavior of the internal combustion engine. If it occurs, there is an advantage that the abnormality can be detected with good response, but on the other hand, the output of the internal combustion engine is transmitted to the driving wheels of the vehicle via an automatic transmission or the like, so that the behavior of the internal combustion engine is actually There is a drawback that a deviation occurs between the behavior of the vehicle experienced by the driver and the sensitivity of the driver may not be met.

  The present invention has been made in consideration of these circumstances, and therefore the object of the present invention is to perform abnormality diagnosis that matches the sensitivity of the driver while ensuring responsiveness of abnormality detection, An object of the present invention is to provide an abnormality diagnosis device for a vehicle drive system that can accurately diagnose an abnormality even while a brake is operating.

  In order to achieve the above object, the invention according to claim 1 controls the throttle opening of the internal combustion engine based on the accelerator operation amount, and the output of the internal combustion engine is driven through an automatic transmission having a torque converter. Is applied to the vehicle drive system, and the target drive torque calculation means calculates the target drive torque of the drive wheel based on the accelerator operation amount, and the actual drive torque detection means provides information on the behavior of the torque converter (hereinafter referred to as “torque converter”). The actual driving torque of the driving wheel is detected based on the behavior information), and the target driving torque calculated by the target driving torque calculating means is compared with the actual driving torque detected by the actual driving torque detecting means by the abnormality diagnosing means. The vehicle drive system is diagnosed for the presence or absence of an abnormality.

  If you look at the power transmission path from the internal combustion engine side to the drive wheels of the vehicle, the torque converter is located closer to the internal combustion engine than the drive wheels, so the actual drive torque detected based on the torque converter behavior information If the abnormality diagnosis is performed, the response of the abnormality detection when an abnormality occurs on the internal combustion engine side can be improved compared to the abnormality diagnosis based on the vehicle behavior information (vehicle speed, etc.). An abnormality can be detected before an abnormal state is reached.

  On the other hand, if the transmission path of vehicle behavior such as braking force from the drive wheel side to the internal combustion engine is viewed, the torque converter is located closer to the drive wheel than the internal combustion engine, and therefore based on the torque converter behavior information. If abnormality diagnosis is performed, it is possible to perform abnormality diagnosis that matches the sensitivity of the driver who feels the behavior of the vehicle, compared to abnormality diagnosis based on behavior information (intake air amount or the like) of the internal combustion engine. In addition, since the torque converter is less affected by the brake braking force than the drive wheels of the vehicle, the abnormality diagnosis based on the torque converter behavior information can accurately determine the presence or absence of the abnormality even during the braking operation.

  A general automatic transmission includes a lockup clutch that directly connects the input shaft side and the output shaft side of the torque converter, but when the lockup clutch is engaged, Since the torque converter does not operate as a fluid coupling because the output shaft side is directly connected, the actual drive torque cannot be detected based on the torque converter behavior information.

  Considering this point, it is preferable to detect the actual drive torque based on the torque converter behavior information when the lockup clutch is released as in the second aspect. In this way, when the lockup clutch is released and the torque converter operates as a fluid coupling, the actual drive torque can be detected with high accuracy based on the torque converter behavior information.

  Further, when the rotational speed of the output shaft of the torque converter is 0 or close to 0, the torque converter is hardly operated as a fluid coupling, so that the actual drive torque cannot be detected based on the torque converter behavior information. Therefore, as in claim 3, it is preferable to detect the actual drive torque based on the torque converter behavior information when the rotational speed of the output shaft of the torque converter is greater than or equal to a predetermined value. In this way, when the rotational speed of the output shaft of the torque converter is equal to or higher than a predetermined value and the torque converter is operating as a fluid coupling, the actual drive torque can be accurately detected based on the torque converter behavior information. .

  Further, the capacity coefficient of the torque converter may be used as the torque converter behavior information as in claim 4, or the rotational speed and output of the input shaft of the torque converter as the torque converter behavior information as in claim 5. A ratio with the rotational speed of the shaft may be used. If the capacity coefficient of the torque converter and the rotation speed ratio between the input shaft and the output shaft are used, the actual drive torque can be detected with high accuracy.

  Further, the present invention is not limited to a system equipped with an automatic transmission provided with a speed change mechanism that adjusts the speed ratio stepwise, and a continuously variable speed change mechanism that continuously adjusts the speed ratio as in claim 6. You may apply to the system which mounts the automatic transmission provided with.

  Further, according to the present invention, as in claim 7, there is provided another actual driving torque detection means for detecting the actual driving torque of the driving wheel based on information other than the torque converter behavior information, and the detection is performed based on the torque converter behavior information. The abnormality diagnosis may be executed using at least one of the actual driving torque and the actual driving torque detected based on information other than the torque converter behavior information.

  Specifically, as another aspect of the present invention, as another actual driving torque detecting means, there is provided means for detecting the actual driving torque of the driving wheel based on information on the behavior of the vehicle (hereinafter referred to as “vehicle behavior information”). When the lockup clutch of the torque converter is engaged, an abnormality diagnosis is performed using the actual drive torque detected based on the vehicle behavior information, and when the lockup clutch is released, based on the torque converter behavior information. The abnormality diagnosis may be executed using at least one of the actual driving torque detected in this way and the actual driving torque detected based on the vehicle behavior information. In this way, in the driving region where the lockup clutch of the torque converter is engaged and the abnormality diagnosis based on the torque converter behavior information cannot be performed, the abnormality diagnosis based on the vehicle behavior information is executed to check whether there is an abnormality. It can be determined with high accuracy.

  Further, as another aspect of the present invention, as another actual drive torque detecting means, there is provided means for detecting the actual drive torque of the drive wheel based on information on the behavior of the internal combustion engine (hereinafter referred to as “internal combustion engine behavior information”), When the rotational speed of the output shaft of the torque converter is lower than a predetermined value, an abnormality diagnosis is executed using the actual driving torque detected based on the internal combustion engine behavior information, and the rotational speed of the output shaft of the torque converter is greater than or equal to a predetermined value. Sometimes, abnormality diagnosis may be executed using at least one of the actual driving torque detected based on the torque converter behavior information and the actual driving torque detected based on the internal combustion engine behavior information. In this way, in the operating region where the abnormality diagnosis based on the torque converter behavior information cannot be performed when the rotational speed of the output shaft of the torque converter is 0 or near zero, the abnormality diagnosis based on the internal combustion engine behavior information is executed. The presence or absence of abnormality can be accurately determined.

  Further, as in claim 10, when the brake is operating, the abnormality diagnosis is executed by using the actual driving torque detected based on the torque converter behavior information preferentially, and when the brake is not operating, the torque is The abnormality diagnosis may be executed using at least one of the actual driving torque detected based on the converter behavior information and the actual driving torque detected based on the vehicle behavior information. In this way, in the driving region where the brake is operating and the diagnosis accuracy of the abnormality diagnosis based on the vehicle behavior information is reduced, the abnormality diagnosis based on the torque converter behavior information is preferentially executed to check whether there is an abnormality. Can be determined with high accuracy.

  Further, as in claim 11, the first abnormality diagnosis using the actual driving torque detected based on the internal combustion engine behavior information and the second abnormality using the actual driving torque detected based on the torque converter behavior information The diagnosis and the third abnormality diagnosis using the actual driving torque detected based on the vehicle behavior information are executed, and there is an abnormality in any one of the first to third abnormality diagnosis. When it is determined, it may be finally determined that there is an abnormality. In this way, for example, it is possible to share the operation region by the first to third abnormality diagnosis and to execute the first to third abnormality diagnosis in the operation region suitable for each, Abnormality diagnosis can be performed in a wider operating range than when only abnormality diagnosis is performed.

  Further, as in claim 12, when the first to third abnormality diagnosis is executed and it is determined that there is an abnormality in any one of the first to third abnormality diagnosis, The other abnormality diagnosis is performed by changing the abnormality determination condition of the abnormality diagnosis so that the abnormality can be easily detected. As a result, it is determined that there is an abnormality in two or more of the first to third abnormality diagnosis. It may be finally determined that there is an abnormality.

  Specifically, as described in claim 13, when it is determined that there is an abnormality in the first abnormality diagnosis, the abnormality determination condition of the second and third abnormality diagnosis is changed to a direction in which the abnormality is easily detected. 2 and the third abnormality diagnosis, and as a result, when it is determined that there is an abnormality in two or more of the first to third abnormality diagnosis, it is finally determined that there is an abnormality, or When it is determined that there is an abnormality in the third abnormality diagnosis, it is preferable to finally determine that there is an abnormality.

  Further, as described in claim 14, when it is determined that there is an abnormality in the second abnormality diagnosis, the abnormality determination condition of the third abnormality diagnosis is changed to a direction in which the abnormality is easily detected, and the third abnormality diagnosis is performed. As a result, when it is determined that there is an abnormality in two or more of the first to third abnormality diagnosis, it is finally determined that there is an abnormality, or there is an abnormality in the third abnormality diagnosis. When it is determined, it may be finally determined that there is an abnormality.

  That is, when it is determined that there is an abnormality in the abnormality diagnosis with excellent responsiveness (the first abnormality diagnosis or the second abnormality diagnosis), the abnormality diagnosis (the second abnormality matching the sensitivity of the driver who senses the behavior of the vehicle) The abnormality determination condition of the abnormality diagnosis or the third abnormality diagnosis) is changed to a direction in which an abnormality is easily detected, and it is determined that there is an abnormality in two or more of the first to third abnormality diagnosis. When it is determined that there is an abnormality in the third abnormality diagnosis, it is finally determined that there is an abnormality. In this way, it is possible to perform abnormality diagnosis that matches the sensitivity of the driver who feels the behavior of the vehicle while improving the response of abnormality detection compared with the case where only the second abnormality diagnosis is executed.

  Hereinafter, the best mode for carrying out the present invention will be described using three Examples 1 to 3.

A first embodiment of the present invention will be described with reference to FIGS.
First, a schematic configuration of the entire 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 that detects the intake air amount is provided downstream of the air cleaner 13. 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 the 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.

  The cylinder block of the engine 11 includes a coolant temperature sensor 26 that detects the coolant temperature, and a crank angle sensor 28 that outputs a crank angle signal (pulse signal) every time the crankshaft 27 of the engine 11 rotates a predetermined crank angle. It is attached. Based on the crank angle signal of the crank angle sensor 28, the crank angle and the engine speed are detected.

  In the automatic transmission 30, the input shaft 32 of the torque converter 31 is connected to the crankshaft 27 of the engine 11, and the transmission gear mechanism 34 is connected to the output shaft 33 of the torque converter 31. Inside the torque converter 31, a pump impeller 35 and a turbine runner 36 constituting a fluid coupling are provided to face each other, and a stator 37 that rectifies the flow of oil is provided between the pump impeller 35 and the turbine runner 36. It has been. The pump impeller 35 is connected to the input shaft 32 of the torque converter 31, and the turbine runner 36 is connected to the output shaft 33 of the torque converter 31.

  The torque converter 31 is provided with a lock-up clutch 38 for directly connecting the input shaft 32 side and the output shaft 33 side. The output torque of the engine 11 is transmitted to the transmission gear mechanism 34 via the torque converter 31, is shifted by a plurality of gears of the transmission gear mechanism 34, and is transmitted to the drive shaft of the wheel.

  The accelerator sensor 39 detects an accelerator operation amount (accelerator pedal depression amount), the brake switch 40 detects a brake operation, and the vehicle speed sensor 41 detects a vehicle speed.

  Outputs of these various sensors are input to an engine control circuit (hereinafter referred to as “ECU”) 29. The ECU 29 is mainly composed of a microcomputer, and executes various engine control programs stored in a built-in ROM (storage medium) to thereby determine the fuel injection amount of the fuel injection valve 21 according to the engine operating state. The ignition timing of the spark plug 22 is controlled.

  At that time, the ECU 29 calculates the target throttle opening based on the accelerator operation amount detected by the accelerator sensor 39 and adjusts the throttle valve so that the actual throttle opening detected by the throttle opening sensor 17 coincides with the target throttle opening. By controlling the 16 motors 15, the output of the engine 11 is controlled according to the accelerator operation amount of the driver. The output of the engine 11 is transmitted to the drive wheels of the vehicle via a torque converter 31 (automatic transmission 30) and the like.

As shown in FIG. 2, the vehicle drive system abnormality diagnosis includes an abnormality diagnosis based on vehicle behavior information and an abnormality diagnosis based on engine behavior information.
In the abnormality diagnosis based on the vehicle behavior information, the actual driving torque Ts of the driving wheel calculated based on information on the behavior of the vehicle such as the vehicle speed and acceleration is compared with the target driving torque Tr of the driving wheel based on the accelerator operation amount. To determine whether there is an abnormality. In the abnormality diagnosis based on the vehicle behavior information, information reflecting the behavior of the vehicle that is actually felt by the driver is used, so that an abnormality diagnosis that matches the sensitivity of the driver can be performed. However, in the abnormality diagnosis based on the vehicle behavior information, even if an abnormality occurs in the behavior of the engine 11, the influence must be transmitted to the drive wheels via the automatic transmission 30 or the like and appear in the behavior of the vehicle. Since abnormality cannot be detected, there is a drawback that the response of abnormality detection is poor. In addition, when the driver senses the occurrence of an abnormality and activates the brake, or when an abnormality occurs during braking, abnormal vehicle behavior (abnormal acceleration, etc.) is suppressed by the braking force of the brake. Therefore, there is a drawback that it is difficult to detect abnormality.

  On the other hand, in the abnormality diagnosis based on the engine behavior information, the actual driving torque Te of the drive wheel calculated based on the information on the behavior of the engine 11 such as the engine control parameters (intake air amount, intake pipe pressure, etc.) and the engine speed, etc. Based on the accelerator operation amount, the target driving torque Tr of the driving wheel is compared to determine whether there is an abnormality. In the abnormality diagnosis based on the engine behavior information, information reflecting the behavior of the engine 11 is used. Therefore, when an abnormality occurs in the behavior of the engine 11, the abnormality can be detected with good response. However, since the output of the engine 11 is transmitted to the driving wheels of the vehicle via the automatic transmission 30 or the like, there is a difference between the behavior of the engine 11 and the behavior of the vehicle that is actually felt by the driver. There is. For this reason, the abnormality diagnosis based on the engine behavior information has a drawback that it may not match the sensitivity of the driver who feels the behavior of the vehicle.

  Therefore, the ECU 29 executes abnormality diagnosis based on torque converter behavior information by executing an abnormality diagnosis program based on torque converter behavior information shown in FIG. 3 described later. In the abnormality diagnosis based on the torque converter behavior information, the ratio between the rotational speed of the input shaft 32 and the rotational speed of the output shaft 33 of the torque converter 31 and the capacity coefficient of the torque converter 31 (the rotational speed of the input shaft 32 and the output shaft 33). The actual driving torque Tt of the driving wheel is calculated based on the information on the behavior of the torque converter 31 such as a function of the ratio), and the target driving torque Tr of the driving wheel is calculated based on the accelerator operation amount. The target drive torque Tr is compared to determine whether the vehicle drive system is abnormal.

  Looking at the power transmission path from the engine 11 side to the drive wheels of the vehicle, the torque converter 31 is located closer to the engine 11 than the drive wheels, so the actual drive torque detected based on the torque converter behavior information If abnormality diagnosis is performed using Tt, the response of abnormality detection when abnormality occurs on the engine 11 side can be improved as compared with abnormality diagnosis based on vehicle behavior information. It becomes possible to detect an abnormality before it becomes.

  On the other hand, if the transmission path of the vehicle behavior such as the brake braking force from the drive wheel side to the engine 11 is viewed, the torque converter 31 is disposed closer to the drive wheel than the engine 11, so the torque converter behavior information is included in the torque converter behavior information. By performing the abnormality diagnosis based on the abnormality diagnosis, it is possible to perform the abnormality diagnosis that matches the sensitivity of the driver who feels the behavior of the vehicle as compared with the abnormality diagnosis based on the engine behavior information. Moreover, since the torque converter 31 is less affected by the brake braking force than the drive wheels of the vehicle, the abnormality diagnosis based on the torque converter behavior information can accurately determine the presence or absence of the abnormality even during the braking operation.

  The processing contents of the abnormality diagnosis program based on the torque converter behavior information of FIG. 3 executed by the ECU 29 will be described below. The abnormality diagnosis program based on the torque converter behavior information shown in FIG. 3 is executed at a predetermined cycle (for example, 16 ms cycle) while the ECU 29 is turned on, and serves as an abnormality diagnosis means in the claims.

When this program is started, first, at step 101, the target drive torque Tr is calculated based on the accelerator operation amount detected by the accelerator sensor 39.
Thereafter, in steps 102 and 103, it is determined whether or not an abnormality diagnosis execution condition based on the torque converter behavior information is satisfied. Here, the execution conditions of the abnormality diagnosis based on the torque converter behavior information include, for example, the following conditions (1) and (2).
(1) The lockup clutch 38 is released (step 102).
(2) The rotational speed of the output shaft 33 of the torque converter 31 is not less than a predetermined value (for example, a rotational speed slightly higher than 0) (step 103).

  When the lockup clutch 38 is engaged, the input shaft 32 side and the output shaft 33 side of the torque converter 31 are in a directly connected state, and the torque converter 31 is not operating as a fluid coupling. The actual drive torque Tt cannot be detected. Therefore, the above condition (1) is set as an abnormality diagnosis execution condition based on the torque converter behavior information.

  Further, when the rotational speed of the output shaft 33 of the torque converter 31 is 0 or close to 0, the torque converter 31 is hardly operated as a fluid coupling, so that the actual drive torque can be detected based on the torque converter behavior information. Can not. Therefore, the condition (2) is set as an abnormality diagnosis execution condition based on the torque converter behavior information.

  If both conditions (1) and (2) are satisfied, the condition for executing abnormality diagnosis based on the torque converter behavior information is satisfied, but neither of the conditions (1) or (2) is satisfied. If there is a condition, an abnormality diagnosis execution condition based on the torque converter behavior information is not satisfied.

  If it is determined in steps 102 and 103 that the abnormality diagnosis execution condition based on the torque converter behavior information is not satisfied, the process proceeds to step 112, and a count value of an abnormality counter described later is reset to 0. The count value of a normal counter, which will be described later, is reset to 0, and this program ends.

  On the other hand, when it is determined in steps 102 and 103 that the abnormality diagnosis execution condition based on the torque converter behavior information is satisfied (that is, it is determined that the lockup clutch 38 is released, and the torque converter If it is determined that the rotation speed of the output shaft 33 of 31 is greater than or equal to a predetermined value), the process proceeds to step 104 and the ratio or torque between the rotation speed of the input shaft 32 of the torque converter 31 and the rotation speed of the output shaft 33 Based on the information about the behavior of the torque converter 31 such as the capacity coefficient of the converter 31, the actual driving torque Tt of the driving wheel is calculated. The capacity coefficient of the torque converter 31 may be calculated by a function or a map using the rotation speed ratio between the input shaft 32 and the output shaft 33 as a parameter. The processing in step 104 serves as actual driving torque detection means in the claims.

  Thereafter, the routine proceeds to step 105, where it is determined whether or not the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Tt based on the torque converter behavior information is greater than or equal to a predetermined value. As a result, if it is determined that the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Tt based on the torque converter behavior information is greater than or equal to a predetermined value, the process proceeds to step 106. The count value of the abnormal counter is counted up and the count value of the normal counter is reset to zero.

  Thereafter, the process proceeds to step 107, where it is determined whether or not the count value of the abnormality counter is equal to or greater than the abnormality determination value. When it is determined that the count value of the abnormality counter is equal to or greater than the abnormality determination value, the process proceeds to step 108. It is determined that there is an abnormality in the vehicle drive system and a warning lamp (not shown) provided on the instrument panel of the driver's seat is turned on, or a warning display section (not shown) of the instrument panel of the driver's seat The warning information is displayed to warn the driver, and the abnormality information (abnormality code or the like) is stored in a rewritable nonvolatile memory such as a backup RAM (not shown) of the ECU 29, and the program is terminated.

  On the other hand, when it is determined in step 105 that the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Tt based on the torque converter behavior information is smaller than a predetermined value. In step 109, the count value of the normal counter is incremented, and the count value of the abnormal counter is reset to zero. Thereafter, the process proceeds to step 110, where it is determined whether or not the count value of the normal counter is equal to or greater than the normal determination value. When it is determined that the count value of the normal counter is equal to or greater than the normal determination value, the process proceeds to step 111. Then, it is determined that there is no abnormality (normal) in the vehicle drive system, and this program ends.

  In the first embodiment described above, the actual drive torque Tt calculated based on the torque converter behavior information and the target drive torque Tr calculated based on the accelerator operation amount are compared to determine whether there is an abnormality in the vehicle drive system. Therefore, compared with the abnormality diagnosis based on the vehicle behavior information, the responsiveness of abnormality detection when an abnormality occurs on the engine 11 side can be improved, and before the vehicle behavior becomes an abnormal state An abnormality can be detected, and an abnormality diagnosis that matches the sensitivity of the driver can be performed rather than an abnormality diagnosis based on engine behavior information. Furthermore, it is possible to accurately determine whether there is an abnormality even while the brake is operating.

  In the first embodiment, when the lock-up clutch 38 is engaged or when the rotational speed of the output shaft 33 of the torque converter 31 is 0 or near 0, the torque converter 31 hardly operates as a fluid coupling. In consideration of the fact that the actual drive torque cannot be detected based on the torque converter behavior information, the lockup clutch 38 is released, and the rotational speed of the output shaft 33 of the torque converter 31 is equal to or higher than a predetermined value. Sometimes, the actual drive torque is detected based on the torque converter behavior information. Therefore, when the torque converter 31 is operating as a fluid coupling, the actual drive torque is accurately detected based on the torque converter behavior information. be able to.

Next, Embodiment 2 of the present invention will be described with reference to FIGS.
In the second embodiment, each abnormality diagnosis program shown in FIGS. 4 to 6 is executed, so that an abnormality diagnosis based on the engine behavior information (first abnormality diagnosis) and an abnormality diagnosis based on the torque converter behavior information are performed. (Second abnormality diagnosis) and abnormality diagnosis (third abnormality diagnosis) based on the vehicle behavior information are executed. At that time, if it is determined that there is an abnormality in the first abnormality diagnosis, the abnormality determination value of the second and third abnormality diagnosis is changed to a direction in which the abnormality is easily detected, and the second and third abnormality diagnosis is performed. When the second abnormality diagnosis determines that there is an abnormality, the third abnormality diagnosis is performed by changing the abnormality determination value of the third abnormality diagnosis so that the abnormality is easily detected. As a result, when it is determined that there is an abnormality in the abnormality diagnosis with excellent responsiveness (the first abnormality diagnosis or the second abnormality diagnosis), the abnormality diagnosis (the first abnormality matching the sensitivity of the driver who senses the behavior of the vehicle) The abnormality determination value of (2 abnormality diagnosis and third abnormality diagnosis) is changed in a direction in which the abnormality is easily detected, and the abnormality diagnosis is performed. As a result, when it is determined that there is an abnormality in two or more of the first to third abnormality diagnoses, it is finally determined that there is an abnormality.
Hereinafter, the processing contents of the abnormality diagnosis programs of FIGS. 4 to 6 executed by the ECU 29 will be described.

[Main abnormality diagnosis]
The main abnormality diagnosis program shown in FIG. 4 is executed at a predetermined cycle (for example, 16 ms cycle) while the ECU 29 is turned on, and serves as an abnormality diagnosis means in the scope of claims. When this program is started, first, in step 201, an abnormality diagnosis program based on engine behavior information (first abnormality diagnosis) is executed by executing an abnormality diagnosis program based on engine behavior information in FIG. Execute. In the first abnormality diagnosis, the target drive torque Tr calculated based on the accelerator operation amount is compared with the actual drive torque Te calculated based on the engine behavior information to determine whether the vehicle drive system is abnormal.

  Thereafter, the process proceeds to step 202, where it is determined whether or not it is determined in the first abnormality diagnosis that there is an abnormality in the vehicle drive system. As a result, if it is determined in the first abnormality diagnosis that there is no abnormality (normal) in the vehicle drive system, the process proceeds to step 203, and the abnormality determination value used in the second abnormality diagnosis is set to the normal value A0. On the other hand, if it is determined in the first abnormality diagnosis that there is an abnormality in the vehicle drive system, the process proceeds to step 204, and the abnormality determination value used in the second abnormality diagnosis is set to a value A1 smaller than the normal value A0. It is easy to determine that the vehicle drive system is abnormal in the second abnormality diagnosis.

  Thereafter, the process proceeds to step 205, where the abnormality diagnosis program (second abnormality diagnosis) based on the torque converter behavior information is executed by executing the abnormality diagnosis program based on the torque converter behavior information of FIG. In this second abnormality diagnosis, the target drive torque Tr calculated based on the accelerator operation amount and the actual drive torque Tt calculated based on the torque converter behavior information are compared to determine whether there is an abnormality in the vehicle drive system. .

  Thereafter, the process proceeds to step 206, in which it is determined whether or not the vehicle drive system is determined to be abnormal in the first abnormality diagnosis or the second abnormality diagnosis. As a result, when it is determined that there is no abnormality (normal) in the vehicle drive system in both the first abnormality diagnosis and the second abnormality diagnosis, the process proceeds to step 207 and the abnormality determination value used in the third abnormality diagnosis is set. Set to normal value B0. On the other hand, if it is determined in the first abnormality diagnosis or the second abnormality diagnosis that there is an abnormality in the vehicle drive system, the process proceeds to step 208, and the abnormality determination value used in the third abnormality diagnosis is determined from the normal value B0. Is set to a small value B1, and it is easy to determine that the vehicle drive system is abnormal in the third abnormality diagnosis.

  Thereafter, the process proceeds to step 209, and an abnormality diagnosis program based on the vehicle behavior information (third abnormality diagnosis) is executed by executing an abnormality diagnosis program based on the vehicle behavior information of FIG. In the third abnormality diagnosis, the target drive torque Tr calculated based on the accelerator operation amount is compared with the actual drive torque Ts calculated based on the vehicle behavior information to determine whether the vehicle drive system is abnormal.

  Thereafter, the process proceeds to step 210, and it is determined whether or not there is an abnormality in two or more abnormality diagnosis among the first to third abnormality diagnosis. As a result, if it is determined that there is an abnormality in two or more of the first to third abnormality diagnoses, the process proceeds to step 211, where it is finally determined that there is an abnormality in the vehicle drive system, and the driver's seat A warning lamp (not shown) provided on the instrument panel is turned on, or a warning display (not shown) on the instrument panel of the driver's seat is displayed to warn the driver. Abnormal information (abnormal code or the like) is stored in a rewritable nonvolatile memory such as a backup RAM (not shown) of the ECU 29, and the program is terminated.

  On the other hand, if it is determined in step 210 that all the first to third abnormality diagnoses are normal (normal), or only one abnormality diagnosis among the first to third abnormality diagnoses is abnormal. If it is determined that there is, the routine proceeds to step 212, where it is finally determined that there is no abnormality (normal) in the vehicle drive system, and this program is terminated.

[Abnormality diagnosis based on engine behavior information (first abnormality diagnosis)]
The abnormality diagnosis program based on the engine behavior information shown in FIG. 5 is a subroutine executed in step 201 of the main abnormality diagnosis program in FIG. When this program is started, first, at step 301, the target drive torque Tr is calculated based on the accelerator operation amount.

  Thereafter, the routine proceeds to step 302, where the actual drive torque Te is calculated based on information related to the behavior of the engine 11, such as engine control parameters (intake air amount, intake pipe pressure, etc.) and engine speed. The processing in step 302 serves as another actual driving torque detection means in the claims.

  Thereafter, the process proceeds to step 303, in which it is determined whether or not the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Te based on the engine behavior information is greater than or equal to a predetermined value. As a result, if it is determined that the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Te based on the engine behavior information is greater than or equal to a predetermined value, the process proceeds to step 304. The count value of the abnormal counter is counted up and the count value of the normal counter is reset to zero. Thereafter, the process proceeds to step 305, where it is determined whether or not the count value of the abnormality counter is greater than or equal to the abnormality determination value. When it is determined that the count value of the abnormality counter is greater than or equal to the abnormality determination value, the process proceeds to step 306. Then, it is temporarily determined that there is an abnormality in the vehicle drive system.

  On the other hand, when it is determined in step 303 that the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Te based on the engine behavior information is smaller than a predetermined value. In step 307, the count value of the normal counter is counted up and the count value of the abnormal counter is reset to zero. Thereafter, the process proceeds to step 308, where it is determined whether or not the count value of the normal counter is equal to or greater than the normal determination value. When it is determined that the count value of the normal counter is equal to or greater than the normal determination value, the process proceeds to step 309. Then, it is temporarily determined that there is no abnormality (normal) in the vehicle drive system.

[Abnormality diagnosis based on torque converter behavior information (second abnormality diagnosis)]
In this embodiment, the abnormality diagnosis program based on the torque converter behavior information of FIG. 3 described in the first embodiment is executed as a subroutine in step 205 of the main abnormality diagnosis program of FIG.

  In this case, if it is determined in step 105 that the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Tt based on the torque converter behavior information is greater than or equal to a predetermined value, The count value of the abnormality counter is counted up, and when it is determined that the count value of the abnormality counter is equal to or greater than the abnormality determination value, it is temporarily determined that there is an abnormality in the vehicle drive system (steps 106 to 108). At this time, if the abnormality determination value used in the second abnormality diagnosis is set to a value A1 smaller than the normal value A0 in step 204 of the main abnormality diagnosis program in FIG. The time from when the absolute value of the difference from the drive torque Tt becomes equal to or greater than a predetermined value until it is determined that there is an abnormality is shortened.

  On the other hand, when it is determined in step 105 that the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Tt based on the torque converter behavior information is smaller than a predetermined value. In this case, the count value of the normal counter is counted up, and when it is determined that the count value of the normal counter is equal to or greater than the normal determination value, it is temporarily determined that there is no abnormality (normal) in the vehicle drive system (step 109). ~ 111).

[Abnormality diagnosis based on vehicle behavior information (third abnormality diagnosis)]
The abnormality diagnosis program based on the vehicle behavior information shown in FIG. 6 is a subroutine executed in step 209 of the main abnormality diagnosis program shown in FIG. When this program is started, first, at step 401, the target drive torque Tr is calculated based on the accelerator operation amount.

Thereafter, in steps 402 and 403, it is determined whether or not an abnormality diagnosis execution condition based on the vehicle behavior information is satisfied. Here, the execution conditions of the abnormality diagnosis based on the vehicle behavior information include, for example, the following conditions (1) and (2).
(1) The brake is not operating (step 402)
(2) The rotational speed of the output shaft 33 of the torque converter 31 is not less than a predetermined value (for example, a rotational speed slightly higher than 0) (step 403).

  During braking, abnormal vehicle behavior (abnormal acceleration, etc.) is suppressed by the brake braking force, making it difficult to detect the actual drive torque Tt based on vehicle behavior information. Therefore, the condition (1) is set as an abnormality diagnosis execution condition based on the vehicle behavior information.

  Further, when the rotational speed of the output shaft 33 of the torque converter 31 is 0 or in the vicinity of 0, since the vehicle is hardly moving, the actual drive torque cannot be detected based on the vehicle behavior information. Therefore, the condition (2) is set as an abnormality diagnosis execution condition based on the vehicle behavior information.

  If both the above conditions (1) and (2) are satisfied, the condition for executing abnormality diagnosis based on the vehicle behavior information is satisfied, but the condition that neither of the above conditions (1) or (2) is satisfied If there is, the condition for executing abnormality diagnosis based on the vehicle behavior information is not satisfied.

  When it is determined in steps 402 and 403 that the abnormality diagnosis execution condition based on the vehicle behavior information is not satisfied, the process proceeds to step 412 to reset the count value of the abnormality counter to 0 and The count value is reset to 0 and this program is terminated.

  On the other hand, if it is determined in steps 402 and 403 that the condition for executing the abnormality diagnosis based on the vehicle behavior information is satisfied (that is, it is determined that the brake is not operating and the output shaft of the torque converter 31). If it is determined that the rotational speed of 33 is greater than or equal to a predetermined value), the process proceeds to step 404, where the actual driving torque Ts is calculated based on information on the behavior of the vehicle such as the vehicle speed and acceleration. The processing in step 404 serves as another actual driving torque detecting means in the claims.

  Thereafter, the process proceeds to step 405, in which it is determined whether or not the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Ts based on the vehicle behavior information is greater than or equal to a predetermined value. As a result, if it is determined that the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Ts based on the vehicle behavior information is greater than or equal to a predetermined value, the process proceeds to step 406. The count value of the abnormal counter is counted up and the count value of the normal counter is reset to zero. Thereafter, the process proceeds to step 407, where it is determined whether or not the count value of the abnormality counter is greater than or equal to the abnormality determination value. When it is determined that the count value of the abnormality counter is greater than or equal to the abnormality determination value, the process proceeds to step 408. Then, it is temporarily determined that there is an abnormality in the vehicle drive system. At this time, if the abnormality determination value used in the third abnormality diagnosis is set to a value B1 smaller than the normal value B0 in step 208 of the main abnormality diagnosis program in FIG. The time from when the absolute value of the difference from the drive torque Ts becomes equal to or greater than the predetermined value until it is determined that there is an abnormality is shortened.

  On the other hand, when it is determined in step 405 that the absolute value of the difference between the target drive torque Tr based on the accelerator operation amount and the actual drive torque Ts based on the vehicle behavior information is smaller than a predetermined value. In step 409, the count value of the normal counter is counted up and the count value of the abnormal counter is reset to zero. Thereafter, the process proceeds to step 410, where it is determined whether or not the count value of the normal counter is equal to or greater than the normal determination value. When it is determined that the count value of the normal counter is equal to or greater than the normal determination value, the process proceeds to step 411. Then, it is temporarily determined that there is no abnormality (normal) in the vehicle drive system.

  In the second embodiment described above, when it is determined that there is an abnormality in the abnormality diagnosis with excellent responsiveness (the first abnormality diagnosis or the second abnormality diagnosis), the abnormality diagnosis that matches the driver's sensitivity (first The abnormality determination value of 2 abnormality diagnosis and 3rd abnormality diagnosis) is changed in a direction in which it is easy to detect the abnormality, and the abnormality diagnosis is performed, and two or more of these first to third abnormality diagnosis are performed. Since it is finally determined that there is an abnormality when it is determined that there is an abnormality, driving to experience the behavior of the vehicle while improving the responsiveness of abnormality detection compared to the case where only the second abnormality diagnosis is executed An abnormality diagnosis suitable for the sensitivity of the person can be performed.

  In the second embodiment, when it is determined that there is an abnormality in two or more of the first to third abnormality diagnoses, it is finally determined that there is an abnormality. When it is determined that there is an abnormality in the abnormality diagnosis, it may be finally determined that there is an abnormality.

  In Example 3 of the present invention, an abnormality diagnosis based on engine behavior information (first abnormality diagnosis), an abnormality diagnosis based on torque converter behavior information (second abnormality diagnosis), and an abnormality based on vehicle behavior information When the diagnosis (third abnormality diagnosis) is executed, for example, in the operation region where the rotational speed of the output shaft 33 of the torque converter 31 is lower than a predetermined value, the first abnormality diagnosis based on the engine behavior information is executed. Then, in the operation region where the rotational speed of the output shaft 33 of the torque converter 31 is equal to or higher than a predetermined value and the lockup clutch 38 is released, the second abnormality diagnosis based on the torque converter behavior information is executed, and the torque converter 31 In the driving region where the rotation speed of the output shaft 33 is equal to or higher than a predetermined value and the lock-up clutch 38 is engaged, vehicle behavior information Run the third abnormality diagnosis based, as a result, it determines that eventually abnormality when it is determined there is an abnormality in any one of the abnormality diagnosis of the first to third abnormality diagnosis. If it does in this way, an operation area can be shared by the 1st-3rd abnormality diagnosis, the 1st-3rd abnormality diagnosis can be performed in an operation area suitable for each, and only the 2nd abnormality diagnosis It is possible to perform abnormality diagnosis in a wider operating range than when executing.

  In the third embodiment, an abnormality diagnosis based on the vehicle behavior information is executed when the lockup clutch 38 is engaged, and an abnormality based on the torque converter behavior information is performed when the lockup clutch 38 is released. The diagnosis is executed, but when the lockup clutch 38 is released, the actual driving torque detected based on the torque converter behavior information and the actual driving torque detected based on the vehicle behavior information are used together or switched. An abnormality diagnosis may be executed.

  In the third embodiment, when the rotational speed of the output shaft 33 of the torque converter 31 is lower than a predetermined value, an abnormality diagnosis based on the engine behavior information is executed, and the rotational speed of the output shaft 33 of the torque converter 31 is predetermined. When the rotational speed of the output shaft 33 of the torque converter 31 is greater than or equal to a predetermined value, the actual drive detected based on the torque converter behavior information is executed. The abnormality diagnosis may be executed by using or switching the torque and the actual driving torque detected based on the engine behavior information.

  In addition, when the brake is operating, abnormality diagnosis is executed by using the actual driving torque detected based on the torque converter behavior information with priority, and when the brake is not operating, it is detected based on the torque converter behavior information. The abnormality diagnosis may be executed by using or switching the actual driving torque and the actual driving torque detected based on the vehicle behavior information.

  In each of the first to third embodiments, whether or not there is an abnormality is determined based on whether or not the absolute value of the difference between the target drive torque and the actual drive torque is equal to or greater than a predetermined value. The presence or absence of abnormality may be determined based on whether or not the driving torque is exceeded.

  In Examples 2 and 3, the first to third abnormality diagnoses are executed in combination. Alternatively, the first and second abnormality diagnoses are executed in combination, or The second and third abnormality diagnoses may be executed in combination.

The transmission mechanism of the automatic transmission 30 is not limited to a gear-type transmission mechanism, and may be a belt-type continuously variable transmission mechanism or a toroidal-type continuously variable transmission mechanism.
In addition, the present invention can be implemented with various modifications without departing from the gist, such as being applicable to a vehicle equipped with a torque converter without a lock-up clutch.

It is a schematic block diagram of the whole system in Example 1 of this invention. It is a figure for demonstrating the characteristic of each abnormality diagnosis. It is a flowchart which shows the flow of a process of the abnormality diagnosis program based on torque converter behavior information. It is a flowchart which shows the flow of a process of the main abnormality diagnosis program of Example 2. It is a flowchart which shows the flow of a process of the abnormality diagnosis program based on engine behavior information. It is a flowchart which shows the flow of a process of the abnormality diagnosis program based on vehicle behavior information.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Engine (internal combustion engine), 12 ... Intake pipe, 16 ... Throttle valve, 17 ... Throttle opening sensor, 21 ... Fuel injection valve, 22 ... Spark plug, 23 ... Exhaust pipe, 29 ... ECU (target drive torque calculation means) , Actual drive torque detection means, abnormality diagnosis means, other actual drive torque detection means), 30 ... automatic transmission, 31 ... torque converter, 32 ... input shaft, 33 ... output shaft, 38 ... lock-up clutch, 39 ... accelerator Sensor, 40 ... Brake switch, 41 ... Vehicle speed sensor

Claims (14)

Applied to a vehicle drive system that controls the throttle opening of an internal combustion engine based on an accelerator operation amount and transmits the output of the internal combustion engine to drive wheels via an automatic transmission having a torque converter;
Target drive torque calculating means for calculating a target drive torque of the drive wheel based on the accelerator operation amount;
Actual driving torque detection means for detecting actual driving torque of the driving wheel based on information on the behavior of the torque converter (hereinafter referred to as “torque converter behavior information”);
An abnormality diagnosing unit that compares the target driving torque calculated by the target driving torque calculating unit with the actual driving torque detected by the actual driving torque detecting unit and diagnoses whether there is an abnormality in the vehicle driving system. An abnormality diagnosis device for a vehicle drive system characterized by the above.   The actual drive torque detecting means detects the actual drive torque based on the torque converter behavior information when a lockup clutch that directly connects the input shaft side and the output shaft side of the torque converter is released. The abnormality diagnosis apparatus for a vehicle drive system according to claim 1.   3. The actual drive torque detection unit detects the actual drive torque based on the torque converter behavior information when the rotation speed of the output shaft of the torque converter is equal to or higher than a predetermined value. 4. An abnormality diagnosis device for a vehicle drive system.   The vehicle drive system abnormality diagnosis apparatus according to any one of claims 1 to 3, wherein the actual drive torque detection means uses a capacity coefficient of the torque converter as the torque converter behavior information.   The said actual drive torque detection means uses the ratio of the rotational speed of the input shaft of this torque converter, and the rotational speed of an output shaft as said torque converter behavior information, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Abnormality diagnosis device for vehicle drive system.   6. The abnormality diagnosis device for a vehicle drive system according to claim 1, wherein the automatic transmission includes a continuously variable transmission mechanism that continuously adjusts a gear ratio. Other actual drive torque detecting means for detecting the actual drive torque of the drive wheel based on information other than the torque converter behavior information,
The abnormality diagnosis means performs abnormality diagnosis using at least one of an actual drive torque detected based on the torque converter behavior information and an actual drive torque detected based on information other than the torque converter behavior information. An abnormality diagnosis apparatus for a vehicle drive system according to any one of claims 1 to 6. The other actual driving torque detecting means includes means for detecting the actual driving torque of the driving wheel based on information on the behavior of the vehicle (hereinafter referred to as “vehicle behavior information”),
The abnormality diagnosis means diagnoses an abnormality using an actual driving torque detected based on the vehicle behavior information when a lock-up clutch that directly connects the input shaft side and the output shaft side of the torque converter is engaged. When the lockup clutch is released, at least one of the actual drive torque detected based on the torque converter behavior information and the actual drive torque detected based on the vehicle behavior information is used. The abnormality diagnosis device for a vehicle drive system according to claim 7, wherein abnormality diagnosis is performed. The other actual drive torque detecting means includes means for detecting the actual drive torque of the drive wheel based on information on the behavior of the internal combustion engine (hereinafter referred to as “internal combustion engine behavior information”),
When the rotational speed of the output shaft of the torque converter is lower than a predetermined value, the abnormality diagnosis means performs abnormality diagnosis using the actual driving torque detected based on the internal combustion engine behavior information, and outputs the torque converter When the rotational speed of the shaft is equal to or greater than the predetermined value, abnormality diagnosis is performed using at least one of the actual driving torque detected based on the torque converter behavior information and the actual driving torque detected based on the internal combustion engine behavior information. The abnormality diagnosis device for a vehicle drive system according to claim 7 or 8, wherein The other actual driving torque detecting means includes means for detecting the actual driving torque of the driving wheel based on information on the behavior of the vehicle (hereinafter referred to as “vehicle behavior information”),
The abnormality diagnosis means preferentially uses the actual drive torque detected based on the torque converter behavior information when the brake is operating, and performs the abnormality diagnosis when the brake is not operating. The abnormality diagnosis is performed using at least one of the actual driving torque detected based on the behavior information and the actual driving torque detected based on the vehicle behavior information. An abnormality diagnosis device for a vehicle drive system according to claim 1. As the other actual driving torque detecting means, means for detecting the actual driving torque of the driving wheel based on information on the behavior of the vehicle (hereinafter referred to as “vehicle behavior information”), and information on the behavior of the internal combustion engine (hereinafter referred to as “internal combustion engine”). Means for detecting the actual driving torque of the driving wheel based on "engine behavior information"),
The abnormality diagnosis means includes a first abnormality diagnosis using the actual driving torque detected based on the internal combustion engine behavior information and a second abnormality diagnosis using the actual driving torque detected based on the torque converter behavior information. And a third abnormality diagnosis using the actual driving torque detected based on the vehicle behavior information, and determining that there is an abnormality in any one of the first to third abnormality diagnosis 11. The abnormality diagnosis apparatus for a vehicle drive system according to claim 7, wherein it is finally determined that there is an abnormality when it is performed. As the other actual driving torque detecting means, means for detecting the actual driving torque of the driving wheel based on information on the behavior of the vehicle (hereinafter referred to as “vehicle behavior information”), and information on the behavior of the internal combustion engine (hereinafter referred to as “internal combustion engine”). Means for detecting the actual driving torque of the driving wheel based on "engine behavior information"),
The abnormality diagnosis means includes a first abnormality diagnosis using the actual driving torque detected based on the internal combustion engine behavior information and a second abnormality diagnosis using the actual driving torque detected based on the torque converter behavior information. And a third abnormality diagnosis using the actual driving torque detected based on the vehicle behavior information, and determining that there is an abnormality in any one of the first to third abnormality diagnosis The other abnormality diagnosis is performed by changing the abnormality determination condition of the other abnormality diagnosis in a direction in which the abnormality is easily detected. As a result, two or more of the first to third abnormality diagnosis are performed. The abnormality diagnosis device for a vehicle drive system according to any one of claims 7 to 10, wherein it is finally determined that there is an abnormality when it is determined in the abnormality diagnosis that there is an abnormality.   The abnormality diagnosis unit changes the abnormality determination condition of the second and third abnormality diagnosis to a direction in which abnormality is easily detected when it is determined that there is an abnormality in the first abnormality diagnosis. As a result, when it is determined that there is an abnormality in two or more of the first to third abnormality diagnosis, it is finally determined that there is an abnormality, or the first 13. The abnormality diagnosis device for a vehicle drive system according to claim 12, wherein when the abnormality diagnosis of No. 3 determines that there is an abnormality, it is finally determined that there is an abnormality.   The abnormality diagnosis means performs the third abnormality diagnosis by changing the abnormality determination condition of the third abnormality diagnosis in a direction in which the abnormality is easily detected when it is determined that there is an abnormality in the second abnormality diagnosis. As a result, when it is determined that there is an abnormality in two or more of the first to third abnormality diagnosis, it is finally determined that there is an abnormality, or an abnormality is detected in the third abnormality diagnosis. 14. The abnormality diagnosis device for a vehicle drive system according to claim 12 or 13, wherein it is finally determined that there is an abnormality when it is determined that there is an abnormality.

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