JP2000236685A - Fault-diagnosing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect failures in the operation of a motor actuator by operating the motor actuator for detecting the failures in a fault-diagnosing device of a device with the motor actuator. SOLUTION: In a fault diagnosis mode, when the fault diagnosis of a motor actuator is started, the motor actuator is operated toward a forward-rotation side, and a limiter signal is used to determine whether or not the reference position of the forward-rotation side has been reached. When it is determined that the reference position of the forward-rotation side has been reached, it is determined whether or not the value of potentiometer is within a preset range. After the diagnosis at the forward-rotation side is completed, then diagnosis of a reverse-rotation side is made. The motor actuator is operated to the reverse-rotation side, and the limiter signal is used to determine whether or not the reference position of the backward-rotation side has been reached. When it is determined that the reference position of the forward-rotation side has been reached, it is determined whether or not the value of potentiometer is within a preset range, thus accurately diagnosing faults.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure diagnosis device for diagnosing whether there is an abnormality in a motor actuator or a sensor, and more particularly to a failure diagnosis device suitable for use in a vehicle air conditioner.

[0002]

2. Description of the Related Art In various devices, 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, disconnection or short circuit is caused by an input voltage of the potentiometer signal. The abnormality is detected, and if there is an abnormality, the abnormality is notified by a display or the like.

Further, in a motor actuator which controls a stop position by detecting a potentiometer signal, usually, two control points (for example, an air conditioner of a vehicle air conditioner) are controlled before a target stop position is controlled. In the case of mixed door control, an initial recognition operation for measuring the potentiometer voltages at the maximum heating position and the maximum cooling position) is performed, and the potentiometer voltage at the target control position is calculated from the potentiometer voltages. . Therefore, if this initial recognition operation is not performed correctly, the air mix door or the like cannot be controlled to the target position.

[0004]

However, as in the above-described conventional failure diagnosis mode, the failure of the motor section of the motor actuator is not achieved only by diagnosing the disconnection and short circuit of the potentiometer signal at the time of failure diagnosis of the motor actuator. Or a locked state where the shaft of the motor actuator cannot be rotated may not be detected.

When a failure is detected at the time of failure diagnosis, it is generally not possible to determine whether or not there is a failure before the diagnosis is performed. Therefore, when an abnormality is detected, it cannot be determined whether the abnormality is detected at the time of the current diagnosis or has already occurred before that.

[0006] The object of the present invention is to focus on such problems, and at least in failure diagnosis of a device equipped with a motor actuator, not only disconnection and short-circuit of a potentiometer but also failure of a motor unit and a locked state of a shaft of the motor actuator. To detect the presence or absence of the

Another object of the present invention is to make it possible to know in detail the timing of occurrence of a detected abnormality in a failure diagnosis.

[0008]

In order to solve the above-mentioned problems, a failure diagnosis apparatus according to the present invention is a failure diagnosis apparatus for a device having at least a motor actuator, which detects an abnormality by actually operating the motor actuator. It consists of what was made as above.

In this failure diagnosis apparatus, for example,
The motor actuator detects the potentiometer signal and controls the stop position. By actually operating the motor actuator, disconnection of the potentiometer, short circuit, and abnormality of the motor unit are detected. Preferably, the motor actuator is actually operated over the entire operating range.

It is preferable to store whether or not there is an abnormality before the start of the failure diagnosis, and to display at the time of the failure diagnosis together with the result of the diagnosis before the failure diagnosis. For example, whether or not there is an abnormality at the time of initial recognition of the motor actuator is stored, and at the time of failure diagnosis, whether or not there is an abnormality at the time of initial recognition is displayed together with the diagnosis result at that time.

The device to be subjected to the failure diagnosis may include various sensors together with the motor actuator. It is preferable to be able to detect abnormality of these sensors at the same time.

Such a failure diagnosis device is particularly suitable for use in failure diagnosis of a vehicle air conditioner.

In the failure diagnosis apparatus according to the present invention as described above, since the motor actuator is actually operated and an abnormality is detected, not only a disconnection or short circuit of the potentiometer but also an abnormality in the actual operation of the motor actuator. Is detected. Therefore, in addition to disconnection and short circuit of the potentiometer,
An abnormality in the motor unit and presence / absence of a locked state of the axis of the motor actuator are detected.

Further, by storing whether or not there is an abnormality before the start of the failure diagnosis and displaying the result together with the diagnosis result at the time of the failure diagnosis, it is possible to know at the same time whether or not there is an abnormality before the failure diagnosis. , The history of abnormalities and the like can be determined more accurately and accurately.

In particular, in the case of a motor actuator that controls a stop position by detecting a potentiometer signal, whether or not there is an abnormality at the time of initial recognition is stored, and the result is displayed together with a failure diagnosis result to thereby display an initial value. It can be determined at the same time whether or not the recognition operation has been performed correctly and whether or not there has been an abnormality before the failure diagnosis.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the failure diagnosis apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 shows control of a failure diagnosis device according to an embodiment of the present invention, and particularly shows a control example of a failure diagnosis device for a device including at least a motor actuator, which is suitable for a vehicle air conditioner or the like. . However, the device to be subjected to the failure diagnosis may include various sensors together with the motor actuator.

The flowchart shown in FIG. 1 will be described. In the failure diagnosis mode according to the present invention, when the 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 motor actuator has reached the forward rotation reference position is determined by a limiter signal. A determination is made (step S2).

If it is determined that the reference position has reached the normal rotation side, it is determined whether or not the potentiometer signal (voltage) is within a predetermined range (normal or not) (step S).
3) If not, a normal rotation side abnormality is set (step S5). If so, the process proceeds to the execution of the reverse rotation operation of the motor actuator described later.

A predetermined time t1 from the start of the forward rotation operation
Is determined (step S4). If not, the process returns to step S2. If the forward rotation side reference position cannot be detected even after the predetermined time t1 has elapsed, the motor unit It is considered that there is an abnormality of the motor actuator or the locked state of the axis of the motor actuator, and a normal rotation side abnormality is set (step S5).

When the normal rotation side diagnosis is completed, the reverse rotation side diagnosis is similarly performed. The motor actuator is operated to the reverse rotation side (step S6), and it is determined from the limiter signal whether the motor actuator has reached the reference position on the reverse rotation side (step S7).

If it is determined that the reference position has reached the reverse rotation side, it is determined whether or not the potentiometer signal (voltage) is within a predetermined range (normal or not) (step S).
8) If not, set a reverse rotation side abnormality (step S10). If yes, step S
Move to 11.

A predetermined time t2 from the start of the reverse rotation side operation
Is determined (step S9). If not, the process returns to step S7. If the reverse rotation reference position cannot be detected even after the predetermined time t2 has elapsed,
It is considered that there is an abnormality in the motor unit or a locked state of the axis of the motor actuator, and a reverse rotation side abnormality is set (step S10).

When the diagnosis on the reverse rotation side is completed, the initial recognition operation of the motor actuator, that is, the initial recognition operation of measuring the potential of two reference points is performed.
First, it is determined whether or not an abnormality has been stored at the time of initial recognition of the normal rotation side (step S11). If an abnormality has been stored, the abnormality is set (step S1).
2). If no abnormality is stored, similarly, it is determined whether or not it is stored that there is an abnormality during the reverse rotation operation at the time of initial recognition (step S13). If an abnormality is stored, the abnormality is set (step S13). 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 the control flow ends.

As described above, in the failure diagnosis by the above-described control, the motor actuator is actually rotated forward and backward, and in addition to the abnormalities such as the disconnection of the potentiometer and the short circuit, the abnormality of the motor unit and the locked state of the shaft of the motor actuator. Is determined.

Further, it is stored whether or not there is an abnormality at the time of performing the initial recognition operation of the motor actuator before the start of the above-mentioned diagnosis, and the stored information on the abnormality is displayed together with the current failure diagnosis result. The abnormality information before the failure diagnosis and the current failure diagnosis result can be known simultaneously and separately, and more detailed and accurate information can be known as a comprehensive diagnosis result.

Although only the failure diagnosis of the motor actuator is shown in the flowchart of FIG. 1, the failure diagnosis of various sensors may be added at the same time.

The failure diagnosis apparatus according to the present invention is particularly suitable for application to an air conditioner for a vehicle. However, the invention is not limited to this. Applicable to any device.

[0028]

As described above, according to the failure diagnosis apparatus of the present invention, not only the disconnection and short circuit of the potentiometer of the motor actuator but also the failure of the motor section and the presence or absence of the locked state of the axis of the motor actuator can be diagnosed. More accurate failure diagnosis can be performed.

Further, since it is possible to display whether or not there is an abnormality at the time of performing the initial recognition operation of the motor actuator, it is possible to determine whether or not there is an abnormality before the diagnosis in addition to the abnormality detected by the current failure diagnosis. become able to.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating an example of control of a failure diagnosis device according to an embodiment of the present invention.

Continued on the front page F term (reference) 5H223 AA20 BB08 DD01 EE02 5H550 AA09 BB09 DD01 EE01 LL31 LL36 LL54 MM09 5H570 AA10 BB10 DD01 EE01 LL11 LL16 LL31 MM07

Claims (6)

[Claims] 1. A failure diagnosis device for a device including at least a motor actuator, wherein the abnormality is detected by actually operating the motor actuator. 2. A motor actuator according to claim 1, wherein the motor actuator detects a potentiometer signal to control a stop position, and by actually operating the motor actuator, disconnection of the potentiometer, short-circuit, and abnormality of the motor unit are detected. 1 failure diagnosis device. 3. The method according to claim 1, wherein whether or not there is an abnormality before the start of the failure diagnosis is stored, and at the time of the failure diagnosis, whether or not there is an abnormality before the execution of the failure diagnosis is displayed together with the diagnosis result at that time. Fault diagnosis device. 4. The method according to claim 2, wherein whether or not there is an abnormality at the time of initial recognition of the motor actuator is stored, and at the time of failure diagnosis, whether or not there is an abnormality at the time of initial recognition is displayed together with the diagnosis result at that time. 3. Failure diagnosis device. 5. The failure diagnosis device according to claim 1, wherein the failure diagnosis target includes a sensor. 6. A vehicle air conditioner having the failure diagnosis device according to claim 1.