JP3688496B2 - Fault diagnosis device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a failure diagnosis device for diagnosing whether or not a motor actuator or sensor is abnormal, and more particularly to a failure diagnosis device suitable for use in a vehicle air conditioner.
[0002]
[Prior art]
In various apparatuses, for example, a vehicle air conditioner, a motor actuator and a sensor are used in each part. In a failure diagnosis mode for diagnosing a failure of a motor actuator or a sensor in such a device, conventionally, in the case of a motor actuator that detects a potentiometer signal and controls a stop position, a disconnection or a short circuit is caused by an input voltage of the potentiometer signal. If an abnormality is detected, the abnormality is notified by display or the like.
[0003]
Further, in a motor actuator that detects a potentiometer signal and controls the stop position, normally, before controlling to the target stop position, two reference points (for example, an air mix door of a vehicle air conditioner). In the case of control, an initial recognition operation for measuring the potentio voltage at the maximum heating position and the maximum cooling position is performed, and the potentio voltage at the target control position is calculated from the potentio voltages. Therefore, if this initial recognition operation is not performed correctly, the air mix door or the like cannot be controlled at the target position.
[0004]
[Problems to be solved by the invention]
However, as in the conventional failure diagnosis mode as described above, the failure of the motor actuator motor part or the shaft of the motor actuator cannot be rotated only by performing a diagnosis of the disconnection or short circuit of the potentiometer signal at the time of failure diagnosis of the motor actuator. The presence or absence of a state may not be detected.
[0005]
Further, when a failure is detected at the time of failure diagnosis, it is not usually possible to determine whether or not a failure has occurred before performing the diagnosis. Accordingly, when an abnormality is detected, it cannot be determined whether the abnormality has been detected at the time of the current diagnosis or has already occurred before that time.
[0006]
The object of the present invention is to pay attention to such problems, and in failure diagnosis of a device equipped with at least a motor actuator, not only the disconnection or short circuit of the potentiometer but also the failure of the motor part and the presence or absence of the locked state of the shaft of the motor actuator. It is to be able to detect.
[0007]
Another object of the present invention is to make it possible to know in more detail the occurrence timing of the detected abnormality in the failure diagnosis.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a failure diagnosis apparatus according to the present invention is a failure diagnosis apparatus for a device having a motor actuator capable of at least forward and reverse rotation. It is determined by the limiter signal whether or not each reference position on the rotation side and the reverse side has been reached, and if it is determined that the reference position on each of the forward and reverse sides has been reached, the potentiometer signal of the motor actuator If the motor actuator does not reach the reference position even after a predetermined time has passed, or if it is determined that the motor has reached the reference position, the potentiometer When the signal does not fall within a predetermined range, an abnormality display process is performed .
[0009]
In this fault diagnosis device, for example, the motor actuator detects a potentiometer signal and controls the stop position. By actually operating the motor actuator, the disconnection of the potentiometer, the short circuit, and the abnormality of the motor unit are detected. The The motor actuator is preferably actually operated over the entire operating range.
[0010]
Further, it is preferable to store whether or not there is an abnormality before starting the failure diagnosis, and display whether or not there is an abnormality before performing the failure diagnosis together with the diagnosis result at the time of performing the failure diagnosis. For example, whether or not there was an abnormality at the time of initial recognition of the motor actuator is stored, and whether or not there was an abnormality at the time of initial recognition is displayed together with the diagnosis result at the time of failure diagnosis.
[0011]
The device to be subjected to the failure diagnosis may include various sensors together with the motor actuator. It is preferable that abnormality of these sensors can be detected at the same time.
[0012]
Such a failure diagnosis device is particularly suitable for use in failure diagnosis of a vehicle air conditioner.
[0013]
In the failure diagnosis apparatus according to the present invention as described above, since the motor actuator is actually operated in the above processing sequence and an abnormality is detected, not only the disconnection or short circuit of the potentiometer but also the actual motor actuator is detected. An operational abnormality is detected. Therefore, in addition to the disconnection or short circuit of the potentiometer, the abnormality of the motor unit and the presence / absence of the locked state of the shaft of the motor actuator are detected.
[0014]
In addition, by storing whether or not there was an abnormality before the start of failure diagnosis and displaying it together with the diagnosis result at the time of failure diagnosis, it is possible to know the presence or absence of the abnormality before the failure diagnosis at the same time. You will be able to judge more accurately and accurately about your career.
[0015]
In particular, in the case of a motor actuator that detects the potentiometer signal and controls the stop position, the initial recognition operation is performed by storing whether or not there was an abnormality at the time of initial recognition and displaying the result together with the failure diagnosis result. It can also be judged at the same time whether or not it has been performed correctly and whether or not there has been an abnormality before the failure diagnosis.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a failure diagnosis apparatus according to the present invention will be described with reference to the drawings.
FIG. 1 shows control of a failure diagnosis apparatus according to an embodiment of the present invention, and particularly shows a control example of a failure diagnosis apparatus for an apparatus having at least a motor actuator, which is particularly suitable for a vehicle air conditioner or the like. . However, the device that is the target of the failure diagnosis may include various sensors together with the motor actuator.
[0017]
The flowchart shown in FIG. 1 will be described. In the failure diagnosis mode according to the present invention, when failure diagnosis of the motor actuator is started, first, the motor actuator is operated to the forward rotation side (step S1), and whether or not the reference position on the forward rotation side has been reached is determined by a limiter signal. Determine (step S2).
[0018]
When it is determined that the forward rotation side reference position has been reached, it is determined whether or not the potentio signal (voltage) is within a predetermined range (normal or not) (step S3). The forward rotation side abnormality is set (step S5). If it is, the motor actuator is moved to a later-described reverse rotation operation.
[0019]
Further, it is determined whether or not a predetermined time t1 has elapsed from the start of the forward rotation side operation (step S4). If not, the process returns to step S2, and even if the predetermined time t1 has elapsed, the normal rotation side If the reference position arrival cannot be detected, it is considered that there is an abnormality in the motor unit or the shaft of the motor actuator is locked, and an abnormality in the forward rotation side is set (step S5).
[0020]
When the forward rotation diagnosis is completed, the reverse rotation diagnosis is performed in the same manner. The motor actuator is operated in the reverse direction (step S6), and it is determined by the limiter signal whether or not the reference position on the reverse side has been reached (step S7).
[0021]
If it is determined that the reverse reference position has been reached, it is determined whether or not the potentio signal (voltage) is within a predetermined range (normal or not) (step S8). The reverse side abnormality is set (step S10). If yes, the process proceeds to step S11.
[0022]
Further, it is determined whether or not a predetermined time t2 has elapsed since the start of the reverse rotation side operation (step S9). If not, the process returns to step S7, and the reverse rotation reference position is reached even if the predetermined time t2 has elapsed. Is not detected, it is considered that there is an abnormality in the motor unit or the shaft of the motor actuator is locked, and an abnormality in the reverse rotation is set (step S10).
[0023]
When the diagnosis on the reverse side is completed, the initial recognition operation of the motor actuator, that is, the initial recognition operation for measuring the two potentiometer voltages as a reference, was performed. It is determined whether it is stored (step S11), and if an abnormality is stored, the abnormality is set (step S12). If no abnormality is stored, it is similarly determined whether or not it has been stored that there was an abnormality during the reverse operation at the time of initial recognition (step S13), and if an abnormality is stored, the abnormality is set ( Step S14). If no abnormality is stored, the process proceeds to step S15. In step S15, all the abnormalities diagnosed so far, that is, all the abnormalities set in steps S5, S10, S12, and S14 are displayed, and this control flow ends.
[0024]
As described above, in the failure diagnosis by the above control, the motor actuator is actually rotated forward and backward, and in addition to the abnormalities such as the disconnection of the potentio and the short circuit, there is an abnormality in the motor unit and the presence or absence of the locked state of the motor actuator shaft. Determined.
[0025]
In addition, whether or not there was an abnormality during the initial recognition operation of the motor actuator before the start of the diagnosis is stored, and information about the stored abnormality is displayed together with the current failure diagnosis result. The abnormal information and the current failure diagnosis result can be known and distinguished at the same time, and more detailed and accurate information can be known as a comprehensive diagnosis result.
[0026]
In the flowchart of FIG. 1, only the failure diagnosis of the motor actuator is shown as an object, but the failure diagnosis of various sensors may be added at the same time.
[0027]
Further, the failure diagnosis apparatus according to the present invention is particularly suitable when applied to a vehicle air conditioner. However, the present invention is not limited to this, and any apparatus can be used as long as it has a failure diagnosis and has at least a motor actuator. Applicable.
[0028]
【The invention's effect】
As described above, according to the failure diagnosis device of the present invention, it is possible to diagnose not only the disconnection or short circuit of the motor actuator potentiometer but also the failure of the motor unit and the motor actuator shaft lock state, and more accurate failure diagnosis. It can be performed.
[0029]
In addition, since it is possible to display whether or not there was an abnormality at the time of initial recognition operation of the motor actuator, in addition to the abnormality detected by the current failure diagnosis, it can be determined whether or not there was an abnormality before performing the diagnosis Become.
[Brief description of the drawings]
FIG. 1 is a flowchart showing an example of control of a failure diagnosis apparatus according to an embodiment of the present invention.

Claims (6)

Whether the motor actuator is actually operated sequentially in the forward rotation direction and the reverse rotation side and reaches the respective reference positions on the forward rotation side and the reverse rotation side in the failure diagnosis device of the apparatus having at least the forward and reverse motor actuator . Is determined by the limiter signal, and if it is determined that the respective reference positions on the forward rotation side and the reverse rotation side have been reached, it is determined whether or not the potentiometer signal of the motor actuator is within a predetermined range, If the motor actuator does not reach the reference position even after a predetermined time has elapsed, or if it is determined that the motor actuator has reached the reference position but the potentiometer signal is not within a predetermined range, an abnormality display process is performed. fault diagnosis apparatus being characterized in that to perform the.   2. The fault diagnosis apparatus according to claim 1, wherein the motor actuator detects a potentiometer signal and controls the stop position, and by actually operating the motor actuator, disconnection of the potentio, short circuit and abnormality of the motor unit are detected. .   The failure diagnosis apparatus according to claim 1 or 2, wherein whether or not an abnormality has occurred is stored before failure diagnosis is started, and whether or not an abnormality has occurred before failure diagnosis is displayed together with a diagnosis result at the time of failure diagnosis.   4. The failure diagnosis apparatus according to claim 2, wherein whether or not an abnormality has occurred during initial recognition of the motor actuator is stored, and whether or not an abnormality has occurred during initial recognition is displayed together with a diagnosis result at the time of failure diagnosis. .   The failure diagnosis apparatus according to claim 1, wherein the failure diagnosis target includes a sensor.   A vehicle air conditioner comprising the failure diagnosis device according to any one of claims 1 to 5.

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