JP2562611B2 - Ultrasonic motor actuator control method and control device for automobile air conditioner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor actuator for a vehicle air conditioner, and more particularly to a control method and control device for an ultrasonic motor.

(Prior Art) In recent years, ultrasonic motors have been put into practical use as applications of piezoelectric ceramics and the like that serve as ultrasonic vibration sources.

This ultrasonic motor is, for example, 90 ° in piezoelectric ceramics.
By applying alternating signals with different phases, a traveling wave due to the piezoelectric effect is generated in this piezoelectric ceramic, and the traveling member moves the moving member mounted on the piezoelectric ceramic to obtain a rotational force. is there.

Such an ultrasonic motor has a slower rotation speed and a larger torque than conventional motors, and thus does not require a speed reducer and is small in size. For example, a motor that opens and closes various doors in an air conditioner for automobiles. It is being used as an actuator.

In such an automobile air conditioner, a plurality of ultrasonic motors are often used. In this case, a plurality of ultrasonic motors are provided with one circuit for generating the above-mentioned AC signal necessary for driving the ultrasonic motors. The cost reduction and the simplification of the device can be achieved by sharing the same.

(Problems to be Solved by the Invention) However, in the above-mentioned configuration, after one ultrasonic motor actuator finishes opening and closing a predetermined door, the next ultrasonic motor actuator receives the above-mentioned information. The alternating AC signal for driving is switched and applied. Therefore, if one ultrasonic motor actuator goes into a locked state for some reason during its operation, the AC signal is continuously applied to the corresponding ultrasonic motor until the locked state is resolved. There is a problem that the controllability is poor because the actuator cannot be controlled.

Therefore, the present invention solves the above-mentioned problems of the conventional example, and in a control device for controlling a plurality of ultrasonic motor actuators, even if one ultrasonic motor actuator is locked, another ultrasonic motor actuator is locked. It is an object of the present invention to provide a control method and a control device with good controllability that enable actuator control.

(Means for Solving Problems) Accordingly, the gist of the first invention is to operate a plurality of ultrasonic motor actuators using an ultrasonic motor that obtains a rotational force by ultrasonic vibration. In an ultrasonic motor actuator control device for an automobile air conditioner, which sequentially controls from one drive signal generating means in a predetermined order, the presence or absence of lock of the plurality of ultrasonic motor actuators is detected, and the lock state is detected. If so, the drive signal is not input to the ultrasonic motor actuator in the lock state, and the drive signal is input to the remaining ultrasonic motor actuators not in the lock state according to the predetermined order. There is something I did.

The gist of the second invention relates to an apparatus for carrying out the above method, and as shown in FIG. 1, a plurality of ultrasonic waves using an ultrasonic motor 28 that obtains a rotational force by ultrasonic vibration. A motor actuator 27 and drive signal generation means 500 for generating a drive signal necessary for driving the ultrasonic motor.
And a switching control means 510 for sequentially inputting the output signal of the drive signal generating means to the plurality of ultrasonic motor actuators 27 in a predetermined order, the ultrasonic motor actuator for an air conditioner for an automobile. In the control device, a lock detecting means 520 for detecting the presence or absence of lock of the plurality of ultrasonic motor actuators 27, and the lock detecting means 520.
When the lock state is detected by the switch, the switching control means 510 causes the ultrasonic motor actuator 2 to be in the lock state.
Switching control change means for prohibiting the input of the output signal of the battle record drive signal generating means 500 to 7 and sequentially inputting the drive signals of the drive signal generating means 50 to the remaining ultrasonic motor actuators not in the locked state. And 530.

The gist of the third invention is to sequentially control the operation of a plurality of ultrasonic motor actuators using an ultrasonic motor that obtains a rotational force by ultrasonic vibration from one drive signal generating means in a predetermined order. In the ultrasonic motor actuator control device for an automobile air conditioner that detects the presence or absence of lock of the plurality of ultrasonic motor actuators, and if a lock state is detected, the lock is detected for a predetermined time after the lock is detected. The drive signal is not input to the ultrasonic motor actuators in the state, and the drive signals are input to the remaining ultrasonic motor actuators not in lock order according to the predetermined order. is there.

The gist of a fourth invention relates to an apparatus for carrying out the method according to the third invention, and as shown in FIG. 2, an ultrasonic motor 28 for obtaining a rotational force by ultrasonic vibration.
Using a plurality of ultrasonic motor actuator 27, drive signal generating means 500 for generating a drive signal necessary to drive the ultrasonic motor 28, the output signal of the drive signal generating means in a predetermined order In the ultrasonic motor actuator control device for an automobile air conditioner, which comprises a switching control means 510 for sequentially inputting to the plural ultrasonic motor actuators 27, the plural ultrasonic motor actuators 27
In the case where the lock state is detected by the lock detecting means 520 for detecting the presence or absence of the lock, and the lock detecting means,
The switching control means 510 prohibits input of the drive signal of the drive signal generation means 500 to the ultrasonic motor actuator 27 in the locked state, and the above-mentioned operation is performed for the remaining ultrasonic motor actuators not in the locked state. Switching control changing means 53 for sequentially inputting drive signals in a predetermined order
0, and a timer means 54 for operating the switching control changing means 530 only for a predetermined time after the lock state is detected.
0 is provided.

(Operation) Therefore, in any of the inventions, after the lock state is detected, the operation control of the ultrasonic motor actuator in the lock state is stopped and the next ultrasonic motor actuator is stopped. In the case where one drive signal generating means is shared by a plurality of ultrasonic motor actuators, even if a certain ultrasonic motor actuator is locked, another ultrasonic motor actuator can be controlled. Control does not interfere with the user.

Further, according to the third and fourth inventions, the operation control of the ultrasonic motor actuator in the locked state is stopped only for a predetermined time, and after the predetermined time has elapsed, the drive signal is applied again. Therefore, when the cause of the lock within the above-mentioned predetermined time is removed, the ultrasonic motor actuator can be restarted, so that the controllability is further improved, and therefore the above-mentioned problems can be achieved. .

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, an air conditioner for a vehicle includes an air conditioning duct 1
Has an inside air inlet 2 and an outside air inlet 3, and an inside / outside air switching door 4 is provided at a portion where the inside air inlet 2 and the outside air inlet 3 are bifurcated. The air to be introduced into the air conditioning duct 1 can be selected from inside air and outside air.

The blower 5 is for sucking air into the air conditioning duct 1 to blow the air to the downstream side, and an evaporator 6 and a heater core 7 are provided on the downstream side of the blower 5.

An air mix door 8 is provided in front of the heater core 7. By adjusting the opening of the air mix door 8, the air passing through the heater core 7 and the air mix door 7 are controlled.
The amount of air that bypasses is varied so that the temperature of the blown air is controlled.

Further, the wake side of the air conditioning duct 1 is divided into an upper air outlet 9, a lower air outlet 10, and a defrost air outlet 11 to open in the vehicle compartment, and mode doors 12a and 12b are provided at the divided portions. By operating the doors 12a and 12b, a desired blowout mode can be obtained.

On the other hand, 13 is a temperature detector that detects the temperature inside the vehicle, 14 is a solar radiation detector that detects the amount of solar radiation, and 15 is a temperature setter that sets the temperature inside the vehicle. These are multiplexers (MPX) that perform signal selection. ) 16 and is input to the A / D converter 17, converted into a digital signal, and input to the microcomputer 18.

The microcomputer 18 includes a central processing unit CPU (not shown), a read-only memory ROM, and a random access memory.
It is well known as it has RAM, input / output port I / O port, etc. This microcomputer 18 has the
In addition to the input signal from the A / D converter 17, the output signals from the first position detection sensor 19, the third position detection sensor 21, and the fourth position detection sensor 22 are input and used for air conditioning door control. To be done. The first position detection sensor 19 outputs a predetermined signal at each position when the inside / outside air switching door 4 is set to the position for closing the inside air inlet 2 or the position for closing the outside air inlet 3. In addition, the third position detection sensor 21
When the mode door 12a is set to the position for closing the upper outlet 9 or the position for closing the lower outlet 10, the fourth position detection sensor 22 causes the mode door 12b to close the lower outlet 10 or defrost the outlet 11. When they are set to the closing position, each outputs a predetermined signal similarly to the first position detecting sensor 19.

The detection of the set position of the air-mix door 8 is performed by a second position detection sensor 20 composed of a potentiometer that moves in conjunction with the air-mix door 8.
This output signal is input to the microcomputer 18 via the multiplexer 16 and the A / D converter 17 described above.

Further, the microcomputer 18 has an inside / outside air switch 23 for switching the setting of the inside / outside air switching door 4 and a mode switch 24 for setting the mode doors 12a and 12b.
Each output signal of is input.

Based on the above-mentioned various input signals, the microcomputer 18 sends the output signal of the drive signal generating circuit 25 to the switching circuit 26 by the ultrasonic motor actuators 27a to 27b.
A control signal for sequentially switching and outputting to 7d is output to perform opening / closing control of the inside / outside air switching door 4, the air mix door 8 and the mode doors 12a, 12b.

As shown in FIG. 4, the ultrasonic motor 28 used in the ultrasonic motor actuators 27a to 27d is made of copper alloy or the like on which the piezoelectric ceramics 28a to be the stator are alternately polarized in the thickness direction. The elastic body 28b is bonded to the elastic body 28b, and the rotor 28c made of aluminum alloy is brought into contact with the elastic body 28b by the spring 28d.
When AC signals of 90 ° different phases are applied to 8a, a signal wave is generated on the elastic body 28b due to resonance of the piezoelectric ceramics 28a, and the rotor 28c on the elastic body 28b is rotated to rotate the output shaft 28e. The rotational force is output to the outside via the.

The drive signal generation circuit 25 is for generating two AC signals having different 90 ° phases required for driving the ultrasonic motor 28, and the switching circuit 26 causes the drive signal generation circuit 25 to operate. This is provided because it is necessary to switch the connection or the like so that the data can be shared and used by the data 27a to 27d.

The lock detection circuit 29 detects the lock of the ultrasonic motor actuators 27a to 27d described above, and outputs a predetermined signal when the lock state is detected, and this output signal is input to the multiplexer 16 described above. Then, it is input to the microcomputer 18 via the A / D converter 17. A concrete example of the lock detecting circuit 29 is shown in FIG.

The lock detection circuit 29 shown in FIG. 5 is output to the outside of the ultrasonic motor 28 for feed back control of the frequency of the drive signal applied to the ultrasonic motor 28 according to the change of the resonance frequency of the ultrasonic motor 28. The feed back signal is used for lock detection. That is, the ultrasonic motor 28 is provided with a piezoelectric element 28f for feed back, in addition to the piezoelectric ceramics 28a serving as a stator.
A part of the voltage applied to the piezoelectric ceramics 28a is output to the outside of the motor through the feedback piezoelectric element 28f as a feedback signal.

The lock detection circuit 29 is composed of a smoothing circuit 30 and a comparator 31, and the signal output from the above-described feedback piezoelectric element 28f is input to the smoothing circuit 30.

The smoothing circuit 30 smoothes the input signal and outputs it to the comparator 31, and the comparator 31 compares the input smoothed signal with the reference voltage. When the ultrasonic motor 28 is in the lock state, the amplitude of the signal taken out from the feed back piezoelectric element 28f becomes small.Therefore, when this amplitude becomes smaller than the above-mentioned reference voltage, the comparator 31 outputs the predetermined signal. It has become. Then, the output signal of the lock detection circuit 29 is applied to the multiplexer 16 described above, is input to the microcomputer 18 via the A / D converter 17, and as will be described later, the lock detection circuit 29 of the lock detection circuit 29 in the microcomputer 18 is input. Lock determination is performed based on the output signal.

Next, a control operation example of the door control in the first and second inventions will be described with reference to the flow chart of FIG.

The microcomputer 18 starts execution from the start step 100, proceeds to step 102, and performs initial settings such as setting flags F _{1 to} F ₃ described later to 0 in the step 102. Then, the process proceeds to step 104, the output signals of various sensors are input, and the process proceeds to step 106. This step 1
At 06, the total signal T corresponding to the cooling load is obtained as T = aT _R + cTd + A based on the vehicle interior temperature T _R , the amount of solar radiation T _S, and the set temperature Td.

 However, a, b, c, A are constants.

After the total signal T is calculated in step 106, step 108
At, it is determined whether the failure display flag F ₁ is "1". This flag F ₁ indicates whether or not the inside / outside air switching door 4 is out of order, and is set to “1” when the inside / outside air switching door 4 is determined to be out of order.

If F ₁ = 1 is determined in this step 108 (YES), that is, if the inside / outside air switching door 4 is out of order, the next step is performed.
Bypass 110 and proceed to step 130, and if it is determined that F ₁ ≠ 1 (NO), proceed to the next step 110.

In step 110, it is determined whether or not there is a request for switching the inside / outside air switching door 4, that is, whether the inside / outside air switch 23 has been operated. If it is determined that it has been operated (ON), the step 110 is executed.
112, otherwise go to step 130.

In step 112, the control of the air mix door 8 is turned off, and the process proceeds to step 114, in which the mode door is turned on.
The control of 12a and 12b is turned off as in step 112 described above. In this way, the air mix door 8 and the mode door 12
The reason that both a and 12b are turned off is that in this door control, the priority order of control is provided such as the inside / outside air switching door 4 → mode doors 12a and 12b → air mix door 8.

After step 114, the routine proceeds to step 116, and the driving of the inside / outside air switching door 4 is started. That is, a control signal is input to the switching circuit 26 from the microcomputer 18, and the output of the drive signal generating circuit 25 is applied to the ultrasonic motor actuator 27a, whereby the inside / outside air switching door 4 is set to the inside / outside air switch 23. Accordingly, it is rotated to a predetermined position. This step 11
After 6 proceed to step 118.

In step 118, it is determined whether the inside / outside air switching door 4 has reached the target set position based on the output signal of the first position detection sensor 19. When it is determined that the target position has been reached, the routine proceeds to step 120, where the control of the inside / outside air switching door 4 is terminated (OFF) and the routine returns to step 104 described above.

On the other hand, if it is determined in step 118 that the target position has not been reached (NO), the process proceeds to step 122 and the same step 122 is performed.
At, the output signal of the lock detection circuit 29 described above is input and the operation proceeds to step 124. In step 124, it is determined whether or not a lock has occurred, and if it is determined that no lock has occurred (NO), the process returns to step 104 and the control is performed from the beginning. If it is determined that the lock state is set (YES), the process proceeds to step 126, the flag F ₁ is set to "1", and then the process proceeds to step 128. And step 128
Then, the control of the inside / outside air switching door 4 is terminated, and the process returns to step 100 described above and the control is performed from the beginning.

In this case, since F ₁ is set to "1" in step 126, the inside / outside air switching door 4 is not controlled, but the mode doors 12a, 12b or the air-mixed door 5 is controlled.

On the other hand, in step 130, it is judged whether or not the failure display flag F _{2 of} the mode doors 12a, 12b is set to "1", and if F ₂ = 1 (YES), that is, the mode doors 12a, 12b. Is in the fault state, the step 132 is bypassed to the step 150, and otherwise (NO) the step 132 is proceeded to.

In step 132, it is judged by the mode switch 24 whether or not the mode has been switched. If the mode has been switched (ON), it goes to step 134. If the mode has not been switched (OFF), it goes to step 150. Each goes.

At step 134, the control of the air mix door 8 is stopped, and the routine proceeds to step 136, where the mode doors 12a and 12b are started to be driven. Note that the specific contents of this driving are basically the same as those in the case of the above-mentioned step 116, and the description thereof will be omitted here.

Next, the process proceeds to step 138, and the opening / closing control of the mode doors 12a and 12b from step 138 to step 148 is basically the same as that of steps 118 to 128 described above, and thus detailed description thereof will be omitted.

Incidentally, F ₂ is a flag for displaying a failure of the mode doors 12a, 12b.

Next, at step 150, it is judged if the failure display flag F _{3 of the} air-mix door 8 is "1". If the result of the determination is that F ₃ = 1 (YES), then the air-mix door 8
The process returns to the above-mentioned step 104 without performing the control of.
If F ₃ ≠ 1 (NO), the process proceeds to step 152.

In step 152, the target position of the air-mix door 8 is calculated according to a pre-programmed calculation formula based on the total signal T calculated in step 106 described above, and the step is calculated.
Proceed to 154.

In step 154, it is determined whether or not the air-mix door 8 is at the target position. If it is determined that the air-mix door 8 is at the target position (YES), the process proceeds to step 156, the control of the air-mix door 8 is terminated (OFF), and the process proceeds to step 104. Return. If it is determined that the target position has not been reached yet (NO), the process proceeds to step 158.

At step 158, when the air-mix door 8 is rotated, it is determined whether the necessary rotation direction is the cool side or the hot side. Here, when it is determined that the air is on the cool side, the process proceeds to step 160, where the air-mix door 8 is rotated to the cool side so as to reach the above-described target position, and then the process proceeds to step 164.

On the other hand, if it is determined to be on the hot side, the process proceeds to step 162, at which the air-mix door 8 is rotated toward the target position on the hot side, and the process proceeds to step 164.

The control from step 164 to step 170 is basically the same as the above-mentioned steps 122 to 128, and detailed description will be omitted.

Next, a control operation example of door control in the third and fourth aspects of the invention will be described with reference to the flow chart of FIG.

In FIG. 7, the steps in which the same operation as that of the flow chart shown in FIG. 6 described above is performed are designated by the same reference numerals, and the description thereof will be omitted. Only the different points will be described below.

In step 107, it is determined whether or not a predetermined operation time of the timer has elapsed, and if it is determined that the predetermined operation time has elapsed (YES), the process goes to step 172 and the predetermined operation time has not yet elapsed. If (NO), proceed to step 108. Here, the timer is configured by software in the microcomputer 18, and if a lock is detected in any one of the inside / outside air switching door 4, the mode doors 12a, 12b, and the air mix door 8, the step 129, 149 or 171 is detected. It is started by.

Steps 172 to 176 are flagged when the timer finishes operating.
It is set to "0" F ₁ ~F _3. This is because the inside / outside air switching door 4, the mode doors 12a and 12b, and the air mix door 8 that have been excluded from the control target for a predetermined time because the lock is detected.
This is done again to control.

In this embodiment, when the lock state is detected, the operation of the ultrasonic motor actuator in the lock state is not controlled, but the failure such as disconnection or short circuit is not limited to the lock detection. Even if it is based on detection, the same effect can be obtained.

(Effects of the Invention) As described above, according to the first and second inventions, when the lock state is detected in any of the plurality of ultrasonic motor actuators, the ultrasonic wave in the lock state is subsequently detected. Since the operation of the motor actuator is not controlled, even if a lock occurs in one of the ultrasonic motor actuators, it will affect the control of other ultrasonic motor actuators in the normal state. In particular, the controllability is improved when one circuit that generates an AC signal required for driving the ultrasonic motor is shared by a plurality of ultrasonic motor actuators.

Further, according to the third and fourth aspects of the invention, the operation control of the ultrasonic motor actuator in which the lock state is detected is prevented from being performed for a predetermined time after the lock state is detected. When the cause of the lock is removed in the interior, for example, the ultrasonic motor may be temporarily locked due to dew condensation, or if the door is susceptible to a large wind pressure, such as an inside / outside air switching door, Therefore, if there is a temporary lock state, the ultrasonic motor actuator can return to normal operation after a lapse of a predetermined time, further improving controllability. The effect of being able to do is produced.

[Brief description of drawings]

FIG. 1 is a block diagram of an ultrasonic motor actuator control device for an automobile air conditioner according to a second invention, and FIG. 2 is an ultrasonic motor actuator control device for an automobile air conditioner according to a third invention. And FIG. 3 is a block diagram showing an embodiment of an ultrasonic motor actuator control device for an automobile air conditioner according to the present invention, and FIG. 4 is an ultrasonic motor actuator for an automobile air conditioner. FIG. 5 is a perspective view of a partial cutout of an ultrasonic motor used in an air conditioner control device, and FIG. 5 is a circuit diagram showing an embodiment of a lock detection circuit used in the ultrasonic motor actuator control device for an automobile air conditioner. FIG. 6 is a flow chart showing a control routine of ultrasonic motor actuator control based on the control method according to the first invention in the ultrasonic motor actuator control device for an automobile air conditioner. FIG. 7 is a flow chart showing a third ultrasonic motor activator Yu eta control of the control routine based on the control method according to the invention of the ultrasonic motor activator Yu eta controller for a motor-vehicle air-conditioning device;. 25 ... Drive signal generation circuit, 26 ... Switching circuit, 27a to 27d ...
... Ultrasonic motor actuator, 500 ... Drive signal generation means, 510 ... Switch control means, 520 ... Lock detection means,
530: Switching control changing means, 540: Timer means.

Claims (4)

(57) [Claims] 1. An ultrasonic motor actuator for an automobile air conditioner for sequentially controlling the operation of a plurality of ultrasonic motor actuators using an ultrasonic motor that obtains a rotational force by ultrasonic vibration in a predetermined order from one drive signal generating means. In the control device, the presence or absence of lock of the plurality of ultrasonic motor actuators is detected, and when the locked state is detected, the drive signal is not input to the ultrasonic motor actuators in the locked state and the locked state is set. A method of controlling an ultrasonic motor actuator of an automobile air conditioner, characterized in that a drive signal is input to the remaining ultrasonic motor actuators in the predetermined order. 2. A plurality of ultrasonic motor actuators using an ultrasonic motor for obtaining a rotational force by ultrasonic vibration, one drive signal generating means for generating a drive signal necessary for driving the ultrasonic motor, and this drive. An ultrasonic motor actuator control device for an automobile air conditioner, comprising: a switching control unit that sequentially inputs an output signal of a signal generation unit to the plurality of ultrasonic motor actuators in a predetermined order. Lock detecting means for detecting the presence or absence of lock, and when the lock detecting means detects the lock state, the switching control means inputs the drive signal of the drive signal generating means to the ultrasonic motor actuator in the lock state. For the remaining ultrasonic motor actuator that is not locked. And a switching control changing means for sequentially inputting the drive signal of the drive signal generating means, the ultrasonic motor actuator control device for an automobile air conditioner. 3. An ultrasonic motor actuator for an automobile air conditioner for sequentially controlling the operation of a plurality of ultrasonic motor actuators using an ultrasonic motor that obtains a rotational force by ultrasonic vibration in a predetermined order from one drive signal generating means. In the control device, the presence or absence of lock of the plurality of ultrasonic motor actuators is detected, and when a locked state is detected, a drive signal is sent to the ultrasonic motor actuators that are in the locked state for a predetermined time after the lock is detected. A method of controlling an ultrasonic motor actuator of an automobile air conditioner, characterized in that a drive signal is input to the remaining ultrasonic motor actuators that are not in a locked state in accordance with the predetermined order. 4. A plurality of ultrasonic motor actuators using an ultrasonic motor for obtaining a rotational force by ultrasonic vibration, one drive signal generating means for generating a drive signal necessary for driving the ultrasonic motor, and this drive. An ultrasonic motor actuator control device for an automobile air conditioner, comprising: a switching control unit that sequentially inputs an output signal of a signal generation unit to the plurality of ultrasonic motor actuators in a predetermined order. Lock detecting means for detecting the presence or absence of lock, and when the lock detecting means detects the lock state, the switching control means inputs the drive signal of the drive signal generating means to the ultrasonic motor actuator in the lock state. For the remaining ultrasonic motor actuator that is not locked. A switching control changing means for sequentially inputting drive signals according to the predetermined order, and a timer means for operating the switching control changing means only for a predetermined time after the lock state is detected. An ultrasonic motor actuator control device for automobile air conditioners.