JPH06253565A - Controller - Google Patents

Abstract

PURPOSE:To provide a controller for detecting failure of motor position detecting means including partial chiping of a terminal plate. CONSTITUTION:Voltages corresponding to the operating positions of a motor are delivered from a plurality of terminals #1-#4. Combination of the voltages is used as a 4 bit positional signal. In the failure diagnosis routine, the motor is driven forcibly (Step 103), and duration of high level voltage from the terminals #1-#4 is measured by a first timer (Hi) during the driving process whereas duration of low level voltage is measured by a second timer (Li) (Step 105) Ti=Hi/Li is then operated (Step 110) and a decision is made that the motor is normal if the Ti comes within a predetermined range(between alphai and betai) otherwise the motor is abnormal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to failure diagnosis of a control device for controlling a motor based on a position detection signal.

[0002]

2. Description of the Related Art In a vehicle air conditioner, one motor is driven under the control of a microcomputer, and a plurality of mode doors are rotated through a power transmission system, whereby a blowout mode is determined. More specifically, the microcomputer calculates the target blowing mode, and when the target blowing mode is different from the current blowing mode, drives the motor to rotate the mode door. The operating position of the motor is detected by the position detecting means. When the motor reaches the position where the target blowing mode is executed, the position detecting means sends a position detection signal representing the operating position of the motor corresponding to the target blowing mode to the microcomputer. The microcomputer stops driving the motor in response to the position detection signal. The position detection means is connected to the contactor which is interlocked with the motor and grounded, a plurality of terminal plates arranged along the moving direction of the contactor, and one or two terminal plates respectively connected to each other and a voltage. And a plurality of terminals provided with. In the position detecting means having the above structure, the combination of the voltage levels (that is, high and low) of the plurality of terminals differs depending on the blowing mode, and the combination of the voltage levels is output as the position detection signal. Hereinafter, this position detection signal is referred to as a position code signal.
In order to perform the blowout mode control, the operating position of the motor must be detected accurately. Therefore, it is necessary to carry out a failure diagnosis of the position detecting means. Conventionally, this failure diagnosis has been performed as follows. That is, the motor is forcibly driven from one end of the drive range to the other end in order to execute all the blowing modes, and in this process, the position code signals corresponding to the blowing mode are sequentially output as expected. Monitor whether or not. Then, when the expected position code signal is not output within the predetermined time, it is determined that there is a failure.

[0003]

In the above fault diagnosis, the position code signal may be output normally in order even if a part of the terminal plate of the position detecting means is deleted. It was difficult to detect the failure. Since the deletion of the terminal plate or the like causes hunting of the motor under normal control, its detection has been desired. Japanese Patent Laid-Open No. 162162/1990 discloses a technique for determining an actuator failure when a difference between an actual position of an actuator detected by a position sensor and a target position exceeds a predetermined amount and continues for a predetermined time. Although disclosed, this technique had the same drawbacks as the prior art described above.

[0004]

As shown in FIG. 1, a control device of the present invention includes a motor 1, a position detecting means 2 representing an operating position of the motor 1, and a position detecting signal from the position detecting means 2. And a control means 3 for controlling the motor 1 based on the above. The position detecting means 2 is connected to the contactor which is interlocked with the motor 1 and grounded, a plurality of terminal plates arranged along the moving direction of the contactor, and one or a plurality of terminal plates, respectively. And a plurality of terminals to which a voltage is applied, and a combination of the voltages of the plurality of terminals corresponding to the contact state between the plurality of terminal plates and the contactor is sent to the control means 3 as the position detection signal. To be Further, the control device of the present invention comprises: a forced drive means 4 for operating the motor 1 within a predetermined range; and a first timing means 5 for measuring the time during which the voltage at the terminal is at a high level during the operation. ,
It has a second time measuring means 6 for measuring the time when the voltage of the terminal is at a low level, and a failure diagnosing means 7 for making a failure diagnosis based on the measurement time of the first time measuring means 5 and the second time measuring means 6. It is characterized by

[0005]

[Operation] During the operation of the motor, the time when the voltage level of the terminal connected to each terminal plate is high level and the time when the voltage is low level are measured, and the terminal plate is deleted based on the measured time. Perform fault diagnosis for faults including.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. First, the vehicle air conditioner of the present embodiment has a blowout mode in which air is blown out from a vent (hereinafter referred to as VENT), a bi-level mode in which both vents and feet are blown out (hereinafter referred to as BI / L), and a little from the defrost to the foot. Mode that blows out a lot (hereinafter D
/ FOOT1 or D / F1), a mode that blows more from the defrost and less from the foot (hereinafter D / F
It is possible to execute a total of five blowing modes, namely, OOT2 or D / F2) and a mode of blowing from defrost (hereinafter referred to as DEF). This blowout mode is set by controlling a plurality of blowout mode doors.

The control device for controlling the blowout mode door is shown in FIG.
As shown in FIG. 3, the mode actuator 10 and the control unit 20 are provided. The control unit 20 is composed of a drive circuit 21 and a microcomputer 22, and the mode actuator 10 is one motor 11 for rotating a plurality of mode doors via a power transmission mechanism.
And a position detecting means 12 which is interlocked with the motor 11. The motor 11 is connected to the drive circuit 2 via the terminals G and H.
It is connected to 1. When this motor 11 is driven from one end to the other end of a predetermined drive range, the plurality of mode doors are rotationally controlled, and the blowout modes are VENT, BI / L,
D / F1, D / F2, and DEF are executed in this order.

The position detecting means 12 interlocks with the motor 11 and moves in the left-right direction of FIG. 2 (the direction orthogonal to the longitudinal direction of itself), and the elongated contact 13 extends in the moving direction of the contact 13 and A long ground plate 14 arranged over the moving range of the contact 13, a pair of short terminal plates 16a, 16b, 16c arranged on a straight line extending in the moving direction of the contact 13, and another straight line parallel to this straight line. It comprises three short terminal plates 17a, 17b, 17c arranged above. The three terminal plates 16a, 16b, 16c are arranged in the moving range of the contact 13 and are separated from each other. The same applies to the other three terminal plates 17a, 17b, 17c. The position detecting means 12 has four terminals # 1, # 2, # 3 and # 4 for outputting a position code signal. Terminal # 1 is on the terminal plate 17a, terminal # 1
2 is connected to the terminal plates 16b and 17c, terminal # 3 is connected to the terminal plates 16a and 17b, and terminal # 4 is connected to the terminal plate 16c. Terminal #
A constant voltage is applied to 1, # 2, # 3, and # 4 via resistors (not shown). Therefore, terminals # 1 to # 4
The voltage of each becomes high level when the connected terminal plate is not in contact with the contact 13, and when the connected terminal plate is in contact with the contact 13, the terminal plate and the contact It is grounded via 13 and the ground plate 14, and becomes a low level. The voltages at the four terminals # 1, # 2, # 3, and # 4 are input to the microcomputer 22 as 4-bit position code signals. 4 bits are the above terminals # 1 to # 4
The microcomputer 22 is compatible with each terminal #
The values 1 to # 4 are recognized as a value 0 when the level is low and a value 1 when the level is high. For example, as shown in FIG. 2, in the case of VENT, the contact 13 has terminal plates 16a, 17
Since it is in contact with a, the terminals # 1 and # 3 have a low level and the terminals # 2 and # 4 have a high level. As a result, the position code signal corresponding to the voltage level of the terminals # 1 to # 4 becomes "0101". The position code signals corresponding to the above-mentioned five blowing modes are different from each other. Further, in this embodiment, another different position code signal is output between the two adjacent blowing modes. FIG. 3 shows all position code signals from VENT to DEF.

The operation of the above configuration will be described. First, the normal control will be described. Based on the position code signal from the position detecting means 12, the microcomputer 22
Calculate the current blowout mode. When the target blowout mode is different from the current blowout mode, the motor 11 is driven so as to be in the target blowout mode. When the contactor 13 reaches the position corresponding to the target blowing mode by driving the motor 11, the position code signals corresponding to the target blowing mode are output from the terminals # 1 to # 4. The microcomputer 22 stops the driving of the motor 11 when receiving the position code signal. Thereby, the target blowing mode can be executed.

Further, the above-mentioned routine for failure diagnosis executed by the microcomputer 22 will be described with reference to FIG. This failure diagnosis routine is started when the ignition key switch (not shown) is turned on or the power switch (not shown) of the air conditioner is turned on. First timer (first time measuring means) H ₁ used in this routine
H ₄ (Hi) measures the time when the terminals # 1 to # 4 are at high level, respectively. The second timer (second timer means) L ₁ ~L ₄ measures the time terminals # 1 to # 4 is at a low level. In step 101, the motor 11 is driven to forcibly initialize it to the VENT position. In the next step 102, another timer T is started. Step 10
At 3, the motor 11 is rotated from the VENT position to the DEF position. In step 104, the voltages of terminals # 1 to # 4 are read. Further, in this step 104, each time the position code signal changes, the position code signal is written in the memory. In step 105, the total time when the voltage of each of the terminals # 1 to # 4 is high is measured by the first timers H1 to H4, and the total time when the voltage of the terminals # 1 to # 4 is low is measured by the second timer. It measures in L1-L4. In step 106, it is determined whether or not all the position code signals read from the VENT position to the DEF position match the position code signals for each mode shown in FIG. When a negative determination is made in step 106, it is determined in step 107 whether the timer T has elapsed for 10 seconds or more. If a negative determination is made here, the process returns to step 103. This loop (step 10) is executed until either step 106 or 107 is affirmatively determined.
3, 104, 105, 106, 107) are repeated. The meaning of "10 seconds" in step 107 will be described.
When the motor 11 is driven from the VENT position toward the DEF position at a predetermined speed, it reaches the DEF position in a time shorter than 10 seconds, for example, 5 seconds. Therefore, if the position code signal from the VENT position to the DEF position cannot be detected even after 10 seconds have elapsed from the start of driving the motor 11, it should be judged that some abnormality has occurred in the position detecting means. Therefore, a negative determination is made in step 106 and step 10
If the result of step 7 is affirmative, the process exits the loop, selects a failure code corresponding to an undetected mode position in step 108, and proceeds to step 115. In step 115, the selected failure code is displayed.

If the determination in step 106 is affirmative, it is not immediately determined to be normal, and the failure diagnosis according to the present invention is performed. More specifically, in step 109, the counter i is incremented by 1 (the initial value of i is 0). Step 110
The ratio Ti between the measurement time of the timer Li designated by the counter i and the measurement time of the timer Hi is calculated by. Step 111
Then, it is determined whether or not this Ti is within a predetermined allowable range (lower limit αi, upper limit βi). If Ti is smaller than the lower limit αi, this indicates that the contact time between the terminal plate and the contactor is unacceptably short, for example, an edge deletion of the terminal plate. Also, Ti is 0
The extreme case indicates an open failure. On the other hand, Ti
Is larger than the upper limit (βi), it indicates that the contact time between the terminal plate and the contact is unacceptably long, and if Ti is too large, it indicates a short-circuit failure. If an affirmative decision is made in step 111, it is decided in step 113 whether or not the counter i is equal to the number of terminals 4, which is four. When a negative determination is made in step 113, the process returns to step 109. This loop (steps 109, 110, 111, 113) is repeated until a negative determination is made in step 111 or an affirmative determination is made in step 113. When a negative determination is made in step 111, a contact failure display code is selected in step 112, and the process proceeds to step 115. If a positive determination is made in step 113, that is, all terminals # 1 to #
When the failure diagnosis of _{No. 4} is executed and it is determined that all of (T1 to T4) are within the above-mentioned allowable range, the normal display code is selected in the next step 114 and the process proceeds to step 115. In step 115, a code is displayed according to the selected code, and this routine ends.

[0012]

As described above, according to the present invention, it is of course possible to detect a contact failure between the contact of the position detecting means and the terminal plate, and it is also possible to detect a partial deletion of the terminal plate as a failure.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of the present invention.

FIG. 2 is a schematic diagram showing a mode door control device of an air conditioner according to an embodiment of the present invention.

FIG. 3 is a diagram showing a position code signal in a blowing mode.

FIG. 4 is a flowchart showing a failure diagnosis routine executed by a microcomputer.

[Explanation of symbols]

 1 Motor 2 Position Detection Means 3 Control Means 4 Forced Driving Means 5 First Timing Means 6 Second Timing Means 7 Failure Diagnosis 11 Motor 12 Position Detecting Means 13 Contactors 14 Grounding Plates 16a-16c, 17a-17c Terminal Plates 22 Micro Computer Hi First timer (first time measuring means) Li Second timer (second time measuring means)

Claims (1)

[Claims] 1. A motor comprising: a motor; a position detecting means for indicating an operating position of the motor; and a control means for controlling the motor based on a position detection signal from the position detecting means, wherein the position detecting means comprises the motor. And a grounded contactor, a plurality of terminal plates arranged along the moving direction of the contactor, and a plurality of terminals respectively connected to one or more terminal plates and to which a voltage is applied. In the control device in which the combination of the voltages of the plurality of terminals corresponding to the contact state between the plurality of terminal plates and the contactor is sent to the control means as the position detection signal, the motor is further provided within a predetermined range. Driving means for activating, a first timing means for measuring a time during which the voltage of the terminal is at a high level during the operation, and the terminal A second timer means for measuring the time the voltage is at a low level, the first, control device characterized by having a failure diagnosis means for performing a fault diagnosis based on the measurement time of the second timer means.