JPH0738969Y2 - Actuator stop control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a device for controlling a stop position of an actuator. INDUSTRIAL APPLICABILITY The device of the present invention can be used, for example, when controlling the position of the intake door of a vehicle air conditioner.

[Prior Art] FIG. 3 shows an example of a conventional intake door stop control device for a vehicle air conditioner. M is an actuator (motor), which is controlled by the drive circuit 1 so as to rotate in a fixed direction. The output shaft of the actuator M is connected to the intake door via a known link mechanism (not shown). Then, by rotating the actuator M in a certain direction, the intake door can be swung within a predetermined range.

A movable contact plate (movable member) 2 is connected to the output shaft of the actuator M. By rotating the actuator M, the movable contact plate 2 interlocks in a fixed direction (arrow direction) about the shaft 3. Be rotated. The movable contact plate 2 is grounded via a sliding contact (not shown) or the like. The movable contact plate 2 slides on the fixed contact 4 arranged on the lower surface side of the movable contact plate 2, and the notch 2a (or non-conduction part) formed on the movable contact plate 2 according to the rotational position of the fixed contact 4 is formed. It is configured to match one.

In this case, three fixed contacts 4 are provided at intervals corresponding to the stop position of the intake door. Each fixed contact 4a,
4b and 4c are three stop positions of the intake door, that is, "FRESH position", "1 / 3FRESH position", and "REC (inside air circulation)".
It corresponds to each position. Fixed contacts 4a, 4b, 4c
Are connected to the input ports A, B and C of the control means 5, respectively, and are also connected to the positive electrode via a resistor.

Then, the movable contact plate 2 having the cutout portion 2a and each fixed contact
A position detector that detects the rotational position of the movable contact plate 2, in other words, the position of the actuator and the intake door, is configured by 4a, 4b, and 4c. Therefore, the fixed contact 4a corresponds to the FRESH position detection unit, the fixed contact 4b corresponds to the 1/3 FRESH position detection unit, and the fixed contact 4c corresponds to the REC (inside air circulation) position detection unit.

According to these detection units, when the movable contact plate 2 is in contact with the corresponding fixed contact 4, the detection signal becomes L, that is, "0", and when the cutout 2a reaches the fixed contact 4, the detection signal becomes H. That is, it becomes "1". FIG. 4 shows the relationship between the position of the intake door and the signal of each port. When the signal a of port A is "1", the door is in the FRESH position. Further, when the signal b of the port B is "1", the door is at the 1/3 FRESH position. When the signal c of port C is "1", the door is REC
In position. In this case, the signal "1" is the position detection signal.

The control means 5 supplies a drive signal to the drive circuit 1, and the stop position designating means 6 sends a target stop position designating signal.
Receives S ₁ supply. Here, the stop position designating means 6 performs calculation based on various information, determines the stop position of the intake door as a result, and supplies the target stop position designating signal S ₁ corresponding thereto to the control means 5. F for FRESH position
The RESH position designation signal, the 1 / 3FRESH position designation signal for the 1 / 3FRESH position, and the REC position designation signal for the REC position are supplied.

Then, the control means 5 supplies a drive signal to the drive circuit 1 in response to these signals, and, for example, when the signal from the stop position designating means 6 is the FRESH position designating signal, the port A
The drive signal is continuously supplied until the input signal a of "1" becomes "1", and when a = 1, the supply of the drive signal is stopped. In the case of the 1/3 FRESH position designation signal, continue supplying the drive signal until the input signal b of port B becomes "1", and b = 1
When it becomes, the supply of the drive signal is stopped. Further, in the case of the REC position designation signal, the supply of the drive signal is continued until the input signal c of the port C becomes “1”, and the supply of the drive signal is stopped when c = 1.

With the above configuration, the intake door is stopped at the target position.

[Problems to be Solved by the Invention] In the above conventional device, when the normal signal is not input to each port, that is, when the position detection function does not work normally, the motor M is continuously energized. Therefore, there is a problem that the motor M continues to rotate forever and the intake door cannot be stopped.

The present invention has been made in view of such a situation, and can reliably stop the motor even when the position detection function becomes defective, and utilizes the remaining position detection capability that is not defective to perform air conditioning. Moreover, it is an object of the present invention to provide an actuator stop control device that can forcefully stop a door at a more effective and safe position, thereby preventing a user from feeling uncomfortable.

[Means for Solving the Problem] An actuator stop control device of the present invention is a movable member that moves along a fixed path in conjunction with the operation of the actuator, and a target of the actuator along the moving path of the movable member. A position detecting section which is arranged corresponding to the stop position and which outputs a position detection signal when the movable member or a predetermined part thereof reaches the position; stop position specifying means for specifying a target stop position of the actuator; Control means for driving the actuator in response to the output of the position designating means, and for stopping the actuator when a position detection signal is input from the position detecting section corresponding to the target stop position designated by the stop position designating means; The movable member moves one or more cycles along the path by the operation of the actuator, and the stop position designating means in the meantime. When a position detection signal corresponding to the designated stop position is not input to the control means, a failure determination means for making a failure determination, and when the failure determination means makes a failure determination, each position for the control means The presence or absence of the position detection signal from the detector is checked, and if the position detection signal is not input from any of the position detectors, a signal for immediately stopping the actuator is supplied to the control means, and any position detector is detected. When a position detection signal is input from the controller, an alternative target stop position designation signal that replaces the signal from the stop position designation means is supplied to the control means in order to stop at the stop position with the highest priority. And means.

[Operation] In the above device, for example, when the position detecting unit is all broken and a normal position detecting signal is not input to the control unit, the control unit immediately stops driving the actuator. In addition, the priorities of the stop positions at the time of failure are set in advance in case the position detection unit fails, and normal position detection signals cannot be obtained from only one position detection unit and normal from other position detection units. If such a position detection signal is obtained, in order to stop the actuator at a position with a higher priority among the normal ones, an alternative signal is given from the failure time processing means to the control means, and the control means is based on that signal. Drive and stop the actuator.

[Embodiment] An embodiment in which the present invention is applied to a stop control device for an intake door will be described below with reference to the drawings.

FIG. 1 shows its schematic configuration. In this device, the structure of the mechanical portion is the same as that of the conventional example except that the structure of the control unit 10 is slightly different from that of the conventional example shown in FIG. Therefore, the same parts as those of the conventional example are denoted by the same reference numerals and the description thereof is omitted, and only the configuration inside the control unit 10 will be described below.

In the control unit 10 of the present apparatus, the stop position designating means 6, the control means 11, the failure judging means 12, the failure processing means
13 are provided. Although these are actually composed entirely of the microcomputer 14, they function functionally as follows.

The stop position designating means 6 has the same function as the conventional one, and as a result of calculation based on various information, a FRESH position designating signal, 1
Either the / 3FRESH position designation signal or the REC position designation signal
Supply to the control means 11.

Further, the failure determination means 12 drives the actuator M for a predetermined time or more, and during that time, the fixed contact 4a, 4b or 4c corresponding to the stop position designated by the stop position designating means 6 from the fixed contact 4a, 4b or 4c to the control means 11 to the position detection signal "1. When "" is not entered, the failure judgment is made. The predetermined time in this case is a time corresponding to one rotation of the movable contact plate 2 or more, and is set to 5 seconds here.

Therefore, for example, the position detection signal "1" is sent from the fixed contact 4a for detecting the FRESH position to the control unit even though the actuator M is being driven for 5 seconds while the stop position designating unit 6 is designating the FRESH position. When not input to 11, the failure determination means 12 determines that the detection circuit of the fixed contact 4a system has a failure. This is also the case for the other contacts 4b and 4c.

Further, the failure processing means 13, when the failure determination means 12 makes a failure determination, each fixed contact 4a, 4b to the control means 11,
The presence or absence of input of position detection signal 1 from 4c (position detection unit) is checked, and position detection signal 1 is detected from any of the fixed contacts 4a, 4b, 4c.
If is not input, a signal for immediately stopping the actuator M is supplied to the control means 11, and the position detection signal 1 is output from any of the fixed contacts 4a, 4b, 4c.
Is input, a substitute target stop position designating signal that replaces the signal from the stop position designating unit 6 is supplied to the control unit in order to stop at a position having a higher priority among the input positions.
Supply to 11.

The control means 11 normally operates the stop position designating means 6
When a position detection signal is input from a fixed contact corresponding to the target stop position designated by the stop position designating means 6, a drive signal is issued in response to the signal from The supply is stopped and the actuator M is stopped. Further, at the time of failure, that is, when the failure determination means 12 makes a failure determination and an alternative target position designation signal is input from the failure processing means 13, an actuator drive signal is supplied until the target position is reached, In response to the position detection signal from the fixed contact, the supply of the drive signal is stopped and the actuator M is stopped.

Actually, since each of the above means is composed of a macro computer, the stop control is performed according to the flowchart of FIG.

This program is built as one of several subroutines in the main routine of the air conditioning control, and this program periodically operates when the ignition switch is turned on.

When you start for the first time, each fixed contact (position detector) 4
The current position of the intake door is input based on the signals from a, 4b, and 4c (step 101), and then the target stop position is determined (step 102). Then, it is next determined whether or not the target stop position and the failure position are equal (step 10
3). Since the failure position data is not stored for the first time,
It is automatically determined as NO and the process proceeds to step 104.

In step 104, it is determined whether or not the current position and the target position are equal, and when both are equal (YES), there is no need to move the intake door, and the routine ends. If they are not equal (NO), the flag 1 and the timer are reset (step 105), and the actuator drive signal is output to drive the actuator M (step 10).
6).

When the actuator M is driven, the intake door moves and the movable contact plate 2 rotates. Then, when a position detection signal is input from the fixed contacts 4a to 4c corresponding to the target stop position, the supply of the actuator drive signal is stopped and the intake door is stopped (step 10).
7, 111). While the position detection signal is not input from the fixed contacts 4a to 4c corresponding to the target stop position, the actuator M is continuously driven and continued until the movable contact plate 2 makes one round (steps 107, 108, 109, 110). . Whether or not one round has been completed is determined based on the timing of the timer (step 110). When the position detection signal is normally obtained from the fixed contacts 4a to 4c, the routine goes through step 111 to end.

On the other hand, when there is no position detection signal input from the fixed contacts 4a to 4c corresponding to the target stop position during one round of the movable contact plate 2 (when YES is determined in step 110), it is determined to be a failure, and a failure occurs. Go to processing. It should be noted that, as described above, while the movable contact plate 2 makes one round, the input states of the signals from the fixed contacts 4a to 4c are checked, and those for which the position detection signal is normally input are stored. Then, the following processing at the time of failure is performed.

In the case of failure, first, the position where the position detection signal is normally input is checked. At this time, priorities are set in advance. From the highest priority, the FRESH position (hereinafter, a
Position), 1 / 3FRESH position (hereinafter referred to as b position),
It is determined in the order of the REC position (hereinafter referred to as the c position). Therefore, first, it is determined whether or not a normal signal is input from the fixed contact 4a at the a position (step 112). Y
In the case of ES, control is performed to stop at position a (step 11
3).

In the stop control in this case, the position a is used as an alternative target stop position instead of the first target stop position, the actuator M is driven thereby, and when the position detection signal is input from the fixed contact 4a at the position a, the actuator M Stop,
The procedure is as follows.

If it is determined in step 112 that a normal signal is not input from the position a (NO), the step is
At 114, it is determined whether or not a normal signal is input from the fixed contact 4b at the b position in the next priority. If YES, control is performed to stop at position b (step 115).

Further, if it is found that the normal signal is not input from the fixed contact 4b at the b position (NO at step 114), the normal signal is output from the fixed contact 4c at the final c position at step 116. It is determined whether or not it is input. c
When it is confirmed that a normal signal is input from the fixed contact 4c at the position (YES), control is performed to stop at the position c (step 117).

When no normal signal is input from the fixed contact 4c at the c position, that is, when normal position detection signals cannot be obtained from all the fixed contacts 4a to 4c, the actuator M is immediately stopped.
Is controlled to stop (step 118). And
Finally, the result of the failure, that is, which position of the fixed contact has failed is stored (step 119), and the process ends. The memory of the fault position is erased when the ignition switch is turned off.

In the processing of the next time and thereafter, after starting, the current position of the intake door is input (step 101), the target position of the intake door is determined (step 102), and then the failure position and the target position are compared (step 103). At this time, for example, when the position detection signal of the a position is not obtained in the previous process, the a position is stored as the failure position, and the target position determined this time is the a position, the determination in step 103 is not made. If YES, jump and proceed to step 112 in case of failure.

As described above, when the position detection signal cannot be obtained from the fixed contact (position detection unit) corresponding to the target position, the intake door is stopped at the position where the position detection signal is obtained according to a predetermined priority order. Further, if no position detection signal is obtained from any fixed contact (position detection unit), the intake door is immediately and forcibly stopped.

Therefore, the intake door can be surely stopped even if the position detection capability is completely lost. Further, when a part of the door is broken, the door can be stopped at a more effective and safe position in terms of air conditioning by making maximum use of the remaining position detection ability. Therefore, even if a failure occurs, the user does not have to feel much discomfort.

In the above embodiment, the case where the present invention is applied to the stop control device for the intake door has been described, but of course the present invention can be applied to stop control devices for other actuators.

Further, in the above-described embodiment, the structure in which the movable contact plate and the fixed contact are combined is shown as the position detecting portion, but other than the above, as long as it detects only the rotational position or the operating position of the movable member, Of course, it is also possible to use a structure. For example, a magnet may be attached to the movable member, and a sensor for converting a magnetic field change into an electric signal may be provided on the detection unit side to detect the rotational position of the movable member.

[Advantages of the Invention] As described above, according to the actuator stop control device of the present invention, the actuator can be reliably stopped even when a normal signal cannot be obtained from the position detection unit. Also, the remaining position detection capability can be used to stop the actuator at the position with the least adverse effect. Therefore, when used to control the position of the air conditioning control door, the user's discomfort can be minimized.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flow chart for explaining the operation of the embodiment, and FIG.
FIG. 4 is a block diagram of a conventional device, and FIG. 4 is a diagram showing the relationship between the position of the intake door and the signal input from the position detection unit. M ... Actuator, 1 ... Driving circuit, 2 ... Movable contact plate, 4,4a, 4b, 4c ... Fixed contact (position detector), 6 ...
Stop position designation means, 11 ... control means, 12 ... failure determination means, 13 ... failure time processing means.

Claims (1)

[Scope of utility model registration request] 1. A control device for selectively stopping an actuator at a plurality of target stop positions, the movable member moving along a fixed path in conjunction with the operation of the actuator, and a moving member along the moving path of the movable member. Each is arranged corresponding to the target stop position of the actuator, the position detection unit that issues a position detection signal when the movable member or its predetermined part reaches that position, and the stop position designation that specifies the target stop position of the actuator Means, and driving the actuator in response to the output of the stop position designating means, and stopping the actuator when a position detection signal is input from the position detection unit corresponding to the target stop position designated by the stop position designating means. A stop control device for an actuator having a control means and the following means (a) and (a): Stop control device of the actuator, characterized. (A) When the movable member moves by one or more cycles by the operation of the actuator, and during that time, no position detection signal is input to the control unit from the position detection unit corresponding to the stop position designated by the stop position designation unit, Failure determination means for making a failure determination. (B) When the failure determination means makes a failure determination, it is checked whether or not a position detection signal is input from each position detection part to the control means, and no position detection signal is input from any position detection part. Supplies a signal for immediately stopping the actuator to the control means, and when a position detection signal is input from any of the position detection units, the stop position designating means is caused to stop at the stop position with the highest priority among them. Fault detection means for supplying an alternative target stop position signal to the control means instead of the output signal from the control means.