JP2002315393A - Stepping motor controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stepping motor controller which is effective for achieving high speed drive of a stepping motor. SOLUTION: When power supply voltage is not lower than a specified level, allowing a low torque high speed drive mode and stepping motors 8, 11 and 14 to be driven are driven independently, the stepping motors 8, 11 and 14 are driven in the low torque high speed drive mode from the starting time. Since the stepping motors 8, 11 and 14 are not started in a high torque low speed drive mode but are driven at a high speed from the start, high-speed drive of the stepping motors 8, 11 and 14 is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stepping motor control device used for, for example, drive control of a stepping motor actuator for driving an air conditioning door of a vehicle air conditioning system.

[0002]

2. Description of the Related Art In a stepping motor control apparatus, a drive mode of a stepping motor is set to, for example, a high torque low speed drive mode or a low torque The mode can be switched to the high-speed driving mode. In the high torque low speed driving mode, the stepping motor is driven at the first driving frequency, and in the low torque high speed driving mode, the stepping motor is driven at the second driving frequency higher than the first driving frequency. Therefore, in the high-torque low-speed drive mode, while the torque increases, the drive speed of the stepping motor decreases.

[0003]

When such a stepping motor control device is applied to an air conditioning system for a vehicle and drive control of each stepping motor actuator for driving an intake door, a mode door, and an air mix door, a stepping motor control device is required. When the driving speed decreases,
For example, the switching of the intake door from the introduction of outside air to the circulation of inside air is delayed, and the unpleasant odor outside the vehicle is more likely to enter the cabin, causing problems such as increasing discomfort to the occupant, and the driving noise of the stepping motor is also increased. Therefore, it is desired to drive the stepping motor as fast as possible.

[0004] The present invention has been made based on the above-described viewpoint, and an object of the present invention is to provide a stepping motor control device that is effective for driving a stepping motor at high speed.

[0005]

According to the present invention, there is provided a high torque low speed driving mode in which a plurality of stepping motors are driven and a driving mode of a stepping motor to be controlled is driven at a first driving frequency based on a power supply voltage. The first
A stepping motor control device that switches to a low-torque high-speed drive mode driven at a second drive frequency higher than the drive frequency, wherein the power supply voltage is equal to or higher than a predetermined voltage value allowing the low-torque high-speed drive mode, and The above object is achieved by a stepping motor control device having first driving means for driving the stepping motor to be driven in the low-torque high-speed driving mode from the start when the stepping motor to be driven is driven alone. I do.

According to such a configuration, when the power supply voltage is equal to or higher than the predetermined voltage value that allows the low-torque high-speed driving mode and the stepping motor to be driven is driven alone, the stepping motor to be driven is driven. Is driven in the low-torque high-speed drive mode from the start, the stepping motor is driven at a high speed from the start without being started in the high-torque low-speed drive mode, and the stepping motor can be driven at a high speed. .

Further, in the present invention, a high torque low speed driving mode in which a plurality of stepping motors are driven and a driving mode of the stepping motor to be driven is driven at a first driving frequency based on a power supply voltage, or In the stepping motor control device for switching to a first low-torque high-speed driving mode driven at a second driving frequency higher than a driving frequency, the power supply voltage is equal to or higher than a predetermined voltage value allowing the first low-torque high-speed driving mode. And, when the stepping motor to be driven is a predetermined stepping motor, a predetermined condition is given,
The above object is achieved by a stepping motor control device having driving means for driving the predetermined stepping motor in a second low torque high speed driving mode driven at a third driving frequency higher than the second driving frequency.

According to such a configuration, the power supply voltage becomes the first
When the predetermined voltage value is equal to or higher than a predetermined voltage value that allows the low-torque high-speed driving mode and a predetermined stepping motor is to be driven, and when a predetermined condition is given, the stepping motor operates at a second driving frequency. Since the stepping motor is driven at a higher third driving frequency, the stepping motor is driven at a higher speed, so that the stepping motor can be driven at a higher speed.

[0009]

FIG. 1 is a block diagram showing an example of an embodiment of the present invention, in which the present invention is applied to a vehicle air conditioning system.

In FIG. 1, reference numeral 1 denotes a control unit for inputting power supply voltage information, sensor information, set temperature information, and operation information, and an intake drive circuit 2, a mode drive circuit 3, an air mix drive circuit 4, and a compressor drive circuit. 5 and the blower drive circuit 6 are controlled. In this example, the power supply voltage information is an ignition voltage provided via an ignition switch. As the sensor information, the outside air temperature, the indoor temperature, the amount of solar radiation, and the like are given, and the set temperature information is given according to an external operation. As the operation information, an ON / OFF operation of an air conditioner switch, a switching operation of outside air introduction / inside air circulation, a switching operation of a blowing mode, and the like are given according to an external operation. Intake drive circuit 2 includes control unit 1
, The stepping motor 8 of the intake actuator 7 is driven to control the intake door 9 that switches between outside air introduction and inside air circulation. The mode driving circuit 3 controls the mode actuator 10 under the control of the control unit 1.
Drive stepping motor 11 and set the blowing mode to D
The mode door 12 that switches to EF, B / L, VENT, or the like is controlled. The air mix drive circuit 4 drives the stepping motor 14 of the air mix actuator 13 under the control of the control unit 1 to control the air mix door 15 that adjusts the mixing ratio of cool air and warm air. Compressor drive circuit 5 and blower drive circuit 6
Controls the compressor 16 and the blower 17 under the control of the control unit 1, respectively.

The control unit 1 calculates and calculates a total signal representing the amount of heat load for controlling the vehicle interior to the set temperature using sensor information such as the outside air temperature, the indoor temperature and the amount of solar radiation, and the set temperature information. An intake control for controlling the intake door 9, a mode control for controlling the mode door 12, and an air mix control for controlling the air mix door 15 are performed such that the interior of the vehicle reaches the set temperature based on the integrated signal. And a function of performing well-known air-conditioning control for controlling the blower 17. Further, in the actuator drive processing in each of the intake control, the mode control, and the air mix control, the control unit 1 sets the drive modes of the stepping motors 8, 11, and 14 of the actuators 7, 10, 13 based on the power supply voltage. It has a function of switching between a high-torque low-speed driving mode in which the driving is performed at one driving frequency and a low-torque high-speed driving mode in which the driving is performed at a second driving frequency higher than the first driving frequency. Furthermore,
When the power supply voltage is equal to or higher than a predetermined voltage value permitting the low-torque high-speed drive mode and the actuator 7 or 10 or 13 to be driven is driven alone, the control unit 1 starts the operation of the actuator from a start-up time. When the actuator 7 or 10 or 13 to be driven is not driven independently in the high-torque driving mode, the actuator is started in the high-torque low-speed driving mode and switched to the low-torque high-speed driving mode after a predetermined time to drive. It has the function to do.

FIG. 2 is a main flowchart of the control unit 1 shown in FIG. 1, and FIG. 3 is a flowchart showing an actuator driving process in FIG.

When power is applied by turning on the ignition switch, the control unit 1 starts the control shown in FIG. 2, and first determines in step 20 whether the air conditioner switch is on or off based on operation information given by an external operation. I do. If the air-conditioner switch is off, the process returns to step 20 via the air-conditioning stop process of step 21, and if the air-conditioner switch is on, the air conditioning control is started. In the air-conditioning control, sensor information and set temperature information are input in step 22, and a total signal is calculated using the sensor information and set temperature information in the next step 23, and then the cabin is adjusted based on the calculated total signal. Intake control in step 24, mode control in step 25, air mix control in step 26, and step 2
7 is performed, and the control unit 1 returns to step 20. In the intake control, the mode control, and the air mix control, the intake door 9, the mode door 12, and the air mix door 15 are controlled by the actuator driving process of FIG. When an inside operation / outside air switching operation and a blowing mode switching operation are requested by an external operation, in the intake control in step 24 and the mode control in step 25, the external operation is recognized based on the operation information, and the external operation is recognized. The intake door 9 and the mode door 12 are controlled to respond to the request.

In the actuator driving process of FIG. 3, the control unit 1 first inputs power supply voltage information in step 31 to recognize the power supply voltage Vm, and then enters the drive frequency determination in step 31. In driving frequency judgment,
Based on the power supply voltage Vm, the stepping motor of the actuator to be driven is stopped, or is driven in a high-torque low-speed drive mode in which the drive is performed at a first drive frequency, or is higher than the first drive frequency. It is determined whether to drive in the low torque high speed drive mode driven at the second drive frequency. The actuators to be driven are the intake actuator 7 in the intake control in step 24 in FIG. 2, the mode actuator 10 in the mode control in step 25, and the air mix actuator 13 in the air mix control in step 26 in FIG. In this example, the first
Has a driving frequency of 166 pps, and the second driving frequency is 250 pps. In this example, the power supply voltage Vm
When the power supply voltage Vm is equal to or higher than 9.5 V, the mode is changed from the stop to the high-torque low-speed drive mode.
When the voltage becomes equal to or higher than V, a high torque low speed drive mode is changed to a low torque high speed drive mode, and when the voltage becomes 12 V or less, a hysteresis is set to change from a low torque high speed drive mode to a high torque low speed drive mode. Is prevented. In these hysteresis, in this example, when power is applied, the stop and the low-torque high-speed drive mode are prioritized. That is, when power is applied, the power supply voltage Vm is 9 V and 9.5.
If it is between V and V, it is determined to be stopped, and 12V and 12.5V
If so, it is determined that the mode is the low torque high speed drive mode.
In step 31, the control unit 1 determines that the operation is stopped, and performs the stop process in step 32 in FIG.
Return to the main flow.

The control unit 1 executes step 31
In step S34, it is determined that the mode is the high torque low speed drive mode, and the process proceeds to step S34 through the setting of the high torque low speed drive mode in step S33. Step 3
In the driving process of the actuator to be driven in No. 4, the driving direction of the actuator is recognized from the current position and the target position of the actuator to be driven, the number of applied pulses from the current position to the target position is calculated, and the current position is set to the target position. After updating the position, the stepping motor of the actuator to be driven is driven according to the set drive mode, the recognized drive direction, and the calculated number of applied pulses. When step 34 is entered from step 33, the actuator to be driven is driven in the high torque low speed drive mode.

The control unit 1 executes step 31
In step 31 to step 35 by recognizing that the power supply voltage Vm is equal to or higher than a predetermined voltage value allowing the low-torque high-speed drive mode, that is, 12 V or more in this example. To determine whether the actuator to be driven is driven alone. If there is no actuator being driven other than the actuator to be driven, and the actuator to be driven is driven alone, the steps from step 35 to step 36
After setting the low-torque high-speed drive mode, the process proceeds to step 34 for driving the actuator to be driven. As a result, the actuator to be driven is driven in the low-torque high-speed drive mode from the beginning without being started in the high-torque low-speed drive mode. for that reason,
The operation speed of the actuator is increased, for example, the switching of the intake door 9 from the outside air introduction to the inside air circulation is performed at a high speed, and the switching from the outside air introduction to the inside air circulation such that a more unpleasant odor enters the vehicle interior becomes slow. In addition, the mode door 12 can be switched to the DEF mode at a high speed, and the fogging or defrosting of the window can be started quickly.
In addition, since the power supply voltage Vm is equal to or higher than a predetermined voltage value that allows the low-torque high-speed driving mode and the actuator to be driven is driven alone, high-speed driving can be performed without causing step-out. The driving noise of the stepping motor can also be reduced.

On the other hand, if it is determined in step 35 that there is an actuator being driven other than the actuator to be driven and the actuator to be driven is not driven alone, step 37 is entered from step 35, and the actuator to be driven is set to step 33. Is started in the high-torque low-speed drive mode, and is switched to the low-torque high-speed drive mode in step 36 after a lapse of a predetermined time and, in this example, one second in this example.

FIGS. 4 and 5 are flowcharts showing another example of the actuator driving process in FIG. 2. Terminals A, B, and C in FIG. 5 are connected to terminals having the same reference numerals in FIG. 4 and 5 are applied to FIG. 2 instead of the actuator drive processing of FIG. In the actuator driving process of this example, when the actuator to be driven is driven alone, in addition to being driven in the low-torque high-speed drive mode from the start, even when the actuator to be driven is not driven alone, When it is estimated that the power supply voltage Vm does not fall below the predetermined voltage value due to the simultaneous driving of the plurality of actuators, the actuator to be driven is driven in the low-torque high-speed driving mode from the start. Further, in this example, when the power supply voltage Vm is estimated to be equal to or lower than a predetermined voltage value by a plurality of simultaneous driving operations including the driving target actuator, the driving target actuator is the intake actuator 7, and the intake actuator 7 Are preferentially driven independently in the low-torque high-speed drive mode.

In the actuator driving process of FIGS. 4 and 5, the control unit 1 first recognizes the power supply voltage Vm in step 40 of FIG.
At 1, the drive frequency is determined. The drive frequency determination is as described in FIG. In step 41, it is determined that the operation is stopped.
Return to the main flow. If it is determined in step 41 that the mode is the high-torque low-speed drive mode, the process proceeds to step 45 after setting the high-torque low-speed drive mode in step 43 and determining the priority drive flag F in step 44. After performing, the process returns to the main flow of FIG. As will be described later, the priority drive flag F indicates that the actuator to be driven is the intake actuator 7 when the power supply voltage Vm is estimated to be equal to or lower than a predetermined voltage value by a plurality of simultaneous drives including the actuator to be driven. Is a determination flag used to independently drive the intake actuator 7 preferentially in the low-torque high-speed drive mode. In the drive processing of the actuator to be driven in step 45, as described in FIG. 3, the stepping motor of the actuator to be driven is driven according to the set drive mode, the recognized drive direction, and the calculated number of applied pulses. . When step 45 is entered after step 43, the actuator to be driven is driven in the high torque low speed drive mode.

The control unit 1 executes step 41
In step 41 to step 46, it is determined that the power supply voltage Vm is equal to or higher than a predetermined voltage value allowing the low torque high speed drive mode, that is, 12 V or more in this example. To determine whether the actuator to be driven is driven alone. If there is no actuator being driven other than the actuator to be driven, and the actuator to be driven is driven alone, the process proceeds from step 46 to step 47.
After setting the low-torque high-speed drive mode, the process proceeds to step 45 through the determination of the priority drive flag F, and the process proceeds to step 45 for driving the actuator to be driven. As a result, as described in the actuator driving process of FIG. 3, the actuator to be driven is driven in the low-torque high-speed driving mode from the start.

On the other hand, if it is determined in step 46 that there is an actuator being driven other than the actuator to be driven and the actuator to be driven is not driven alone, the process proceeds from step 46 to step 48 where the actuator to be driven is driven. Next, it is estimated whether or not the power supply voltage Vm drops to a predetermined voltage value that allows the low-torque high-speed drive mode, that is, 12 V or less in this example. This estimation is made based on whether or not {Vm-α} <12. Vm is the power supply voltage as described above, and α is the voltage drop of one actuator. In this example, the voltage drop α is set based on the average value of the voltage drop of each of the actuators 7, 10, and 13. {Vm-α} is 1
If it does not become smaller than 2V, the control unit 1
Presumes that the power supply voltage Vm will not fall below the predetermined voltage value of 12 V even if the actuators to be driven are driven simultaneously to drive a plurality of actuators. After the determination of the priority drive flag F, the process proceeds to step 45, and returns to the main flow of FIG. 2 through the drive processing of the actuator to be driven. As a result, the actuator to be driven is driven in the low-torque high-speed drive mode from the start.

In step 48, {Vm-α} is 12
If V is smaller than V, the control unit 1 proceeds to step 49 from step 48 and determines whether the actuator to be driven is the intake actuator 7 or not. If it is not the intake actuator 7, the setting of the high torque low speed drive mode in step 43 and the step 4
After entering the step 45 after the determination of the priority drive flag F of step 4, the actuator to be driven is driven in the high-torque low-speed drive mode, and the process returns to the main flow of FIG. On the other hand, if the actuator to be driven is the intake actuator 7, the control unit 1 enters step 50 from step 49, sets the priority drive flag F to “1”, and then sets the low torque high speed drive mode in step 47. Then, step 44 is entered after the setting of. Since the priority drive flag F is set to "1", the control unit 1 enters step 51 from step 44, stops the driving actuator, and then proceeds to step 52.
, The drive process of the intake actuator 7 is performed, and the drive end of the intake actuator 7 is determined in step 53. In the stopping process of the actuator being driven in step 51, re-driving information for re-driving the actuator to the target position is temporarily stored. Step 52
In the driving process of the intake actuator 7, the driving direction of the intake actuator 7 is recognized from the current position and the target position of the intake actuator 7, the number of applied pulses from the current position to the target position is calculated, and the current position is set to the target position. After the update, the stepping motor 8 of the intake actuator 7 is driven in the low-torque high-speed drive mode from the start of operation in accordance with the recognized driving direction and the calculated number of applied pulses. When the driving of the intake actuator 7 is completed, the process proceeds from step 53 to step 54, and based on the re-driving information temporarily stored in step 51, the driving process of the stopped driven actuator is restarted. The drive flag F is reset to “0” and the process returns to the main flow in FIG.

In the actuator driving process shown in FIGS. 4 and 5, the voltage drop α is determined by each of the actuators 7, 10, and 13.
Is set based on the average value of the voltage drop, and is used in common for each of the actuators 7, 10, and 13. However, the present invention is not limited to this. The voltage drop of intake actuator 7 is α ₁ , mode actuator 1
The voltage drop of 0 is α ₂ , and the air mix actuator 1
3 is set for each actuator as α _{3. In} step 48 of FIG. 4, when the actuator to be driven is the intake actuator 7, α _{1 is set.}
And α ₂ when the mode actuator 10 is used, and α ₂ when the air mix actuator 13 is used.
₃ may be used.

FIGS. 6 and 7 are flowcharts showing still another example of the actuator driving process in FIG. 2. Terminals D, E, F, G and H in FIG. 7 are connected to the terminals having the same reference numerals in FIG. . 6 and 7 are applied to FIG. 2 instead of the actuator drive processing of FIG. In this example, as shown by a broken line in FIG. 1, an outside air pollution degree detecting means 60 is provided to detect outside air pollution due to exhaust gas, smoke, unusual smell, etc. outside the vehicle, and to indicate the degree of contamination of the outside air. The degree is given to the control unit 1 from the outside air pollution degree detecting means 60. As the outside air pollution degree detecting means 60, a known gas sensor can be used. In such an actuator drive process of this example, when a request to switch the intake door 9 from outside air introduction to inside air circulation is given,
Alternatively, when the outside air pollution degree detecting means 60 detects the pollution degree which is equal to or more than a predetermined value, the second low frequency driving at a third driving frequency higher than the second driving frequency in the first low torque high speed driving mode. In the torque high-speed drive mode, the intake actuator 7 is driven. The first low torque drive mode is the low torque high speed drive mode described above.

In the actuator driving process shown in FIGS. 6 and 7, the control unit 1
After recognizing the power supply voltage Vm in step 1, the drive frequency is determined in the next step 62. FIG. 3 shows the driving frequency determination.
As described in the above. That is, based on the power supply voltage Vm, the stepping motor of the actuator to be driven is stopped, or the stepping motor is driven in the high-torque low-speed driving mode in which the driving is performed at the first driving frequency. It is determined whether to drive in the first low-torque high-speed driving mode in which driving is performed at a second driving frequency that is also higher.
In this example, as described in FIG.
66 pps and the second drive frequency is 250 pps. If it is determined in step 62 that the operation is stopped, the process returns to the main flow in FIG. 2 through the stop process in step 63. If it is determined in step 62 that the high-torque low-speed drive mode is set, the process proceeds to step 65 through the setting of the high-torque low-speed drive mode in step 64, and the drive processing of the actuator to be driven is performed. Return. In the drive processing of the actuator to be driven in step 65, as described in FIG. 3, the stepping motor of the actuator to be driven is driven according to the set drive mode, the recognized drive direction, and the calculated number of applied pulses. . When step 65 is entered after step 64, the actuator to be driven is driven in the high torque low speed drive mode.

The control unit 1 executes step 62
Is determined to be the first low-torque high-speed drive mode, that is, the power supply voltage Vm is a predetermined voltage value allowing the first low-torque high-speed drive mode, that is, 12 V in this example.
By recognizing the above, the process proceeds from step 62 to step 66, and it is determined whether or not the actuator to be driven is the intake actuator 7. If the intake actuator 7 is not the drive target, the process proceeds from step 66 to step 67, in which the first low-torque high-speed drive mode is set. After the drive process of the drive target actuator in step 65 is performed, the main flow in FIG. Return. As a result, the actuator to be driven is driven in the first low-torque high-speed drive mode.

On the other hand, if the actuator to be driven is the intake actuator 7 in step 66,
The control unit 1 enters step 68 from step 66, and determines whether or not a switching operation from introduction of outside air to circulation of inside air has been performed based on the operation information. By performing the switching operation, a request for switching from outside air introduction to inside air circulation is recognized, and the process proceeds from step 68 to step 69, in which the third driving frequency higher than the second driving frequency in the first low-torque high-speed driving mode. After setting the second low-torque high-speed drive mode for driving at the drive frequency and performing the drive processing of the actuator to be driven in step 65, the process returns to the main flow in FIG. In this example, the third drive frequency is 333 pps
It is. Thereby, the intake actuator 7
High-speed driving is performed at a third driving frequency higher than the second driving frequency, and switching from outside air introduction to internal air circulation is performed at high speed. Therefore, it is possible to significantly reduce adverse effects caused by a delay in switching from the introduction of outside air to the circulation of inside air, such as a case in which more unpleasant odor enters the vehicle interior.
If the switching operation from the outside air introduction to the inside air circulation is not performed, the control unit 1 enters the step 70 from the step 68 and inputs the pollution degree from the outside air pollution degree detecting means 60, and in the next step 71, detects the outside of the vehicle It is determined whether or not the degree of air pollution is equal to or more than a predetermined value. If the detected degree of contamination is equal to or less than the predetermined value, the process proceeds to step 65 to set the first low-torque high-speed drive mode, and then enters the drive processing of the actuator to be driven in step 65, and then returns to the main flow in FIG. If the detected degree of contamination is equal to or higher than the predetermined value,
After entering the step 72 from the step 71 and requesting the switching from the outside air introduction to the inside air circulation, the second low-torque high-speed drive mode is set in a step 69, and the drive processing of the actuator to be driven in the step 65 is performed. It returns to the main flow of FIG. Accordingly, intake actuator 7 is driven at a high speed at the third drive frequency higher than the second drive frequency, and the switching from the introduction of outside air to the circulation of inside air is performed at a high speed. Therefore, it is possible to significantly reduce adverse effects caused by a delay in switching from the introduction of outside air to the circulation of inside air, such as a case in which more unpleasant odor enters the vehicle interior.

In the actuator drive processing shown in FIGS. 6 and 7, it is determined in step 66 whether the actuator to be driven is the intake actuator 7. In addition to this, as shown in FIG. Alternatively, it can be determined whether the intake actuator 7 is driven independently. That is,
When the actuator to be driven is the intake actuator 7 and the intake actuator 7 is driven independently, the intake actuator 7 may be configured to be driven at the third drive frequency. According to this, since the intake actuator 7 is driven alone, the risk of step-out can be further reduced.

FIGS. 8 and 9 are flowcharts showing still another example of the actuator driving process in FIG. 2. The terminals I, J, K, and L in FIG. 9 are connected to the terminals having the same reference numerals in FIG. 8 and 9 are applied to FIG. 2 instead of the actuator drive processing of FIG. In the actuator processing of the present example, when the switching operation to the DEF mode is performed,
The mode actuator 10 is driven in a second low-torque high-speed driving mode in which the driving is performed at a third driving frequency higher than the second driving frequency in the first low-torque high-speed driving mode. The first and second low-torque high-speed drive modes are as described in the actuator drive processing of FIGS. 6 and 7.

In the actuator driving process shown in FIGS. 8 and 9, the control unit 1
After recognizing the power supply voltage Vm at 0, the drive frequency is determined at the next step 81. FIG. 6 shows the driving frequency determination.
As described in the above. If it is determined in step 81 that the operation is stopped, the process returns to the main flow in FIG. 2 through the stop process in step 82. If it is determined in step 81 that the mode is the high torque low speed drive mode, the process proceeds to step 84 through the setting of the high torque low speed drive mode in step 83, and the drive processing of the actuator to be driven is performed. Return. In the drive processing of the actuator to be driven in step 84, as described above, the stepping motor of the actuator to be driven is driven according to the set drive mode, the recognized drive direction, and the calculated number of applied pulses. When step 84 is entered via step 83, the actuator to be driven is driven in the high torque low speed drive mode.

On the other hand, the control unit 1 determines in step 81 that the current mode is the first low-torque high-speed driving mode, that is, if the power supply voltage Vm is equal to the predetermined voltage value allowing the first low-torque high-speed driving mode, In the example, by recognizing that the voltage is 12 V or more, step 81
Step 85 is entered to determine whether or not the actuator to be driven is the mode actuator 10. If the mode actuator 10 is not the drive target, the process goes from step 85 to step 86 to set the first low-torque high-speed drive mode. After the drive processing of the drive target actuator in step 84 is performed, the main flow in FIG. Return. As a result, the actuator to be driven is driven in the first low-torque high-speed drive mode.

If it is determined in step 85 that the actuator to be driven is the mode actuator 10, the control unit 1 enters step 87 from step 85, and determines whether or not a switching operation to the DEF mode has been performed based on the operation information. I do. By performing the switching operation to the DEF mode, the process proceeds from step 87 to step 88, where the second low torque driving at the third driving frequency higher than the second driving frequency of the first low torque high speed driving mode is performed. After setting the high-speed drive mode and performing the drive processing of the actuator to be driven in step 84, the process returns to the main flow of FIG. Thereby, the mode actuator 10
Is driven at a high speed at a third driving frequency higher than the second driving frequency, and switching to the DEF mode is performed at a high speed. Therefore, fogging or defrosting of the window can be started quickly. If there is no switching operation to the DEF mode in step 87, the control unit 1 proceeds from step 87 to the first
After the setting of the low-torque high-speed driving mode described above, the driving process of the actuator to be driven is started in step 84, and thereafter, the process returns to the main flow of FIG.

In the actuator driving process shown in FIGS. 8 and 9, it is determined whether or not the actuator to be driven is the mode actuator 10 in step 85. In addition to this, as shown in FIG. It is also possible to make a judgment as to whether or not the mode actuator 10 is driven independently. That is, the actuator to be driven is the mode actuator 10,
Further, when the mode actuator 10 is driven independently, the mode actuator 10 may be driven at the third drive frequency. According to this, since the mode actuator 10 is driven independently, the possibility of step-out can be further reduced.

In the above example, the case where the present invention is applied to a vehicle air-conditioning system has been described. However, the present invention is not limited to this, and it is needless to say that the present invention can be applied to drive control of a plurality of stepping motors.

[0035]

As described above, according to the present invention, when the power supply voltage is equal to or higher than the predetermined voltage value allowing the low-torque high-speed driving mode and the stepping motor to be driven is driven alone, Since the stepping motor to be driven is driven in the low-torque high-speed drive mode from the start, the stepping motor is driven at a high speed from the start without being started in the high-torque low-speed drive mode. High-speed driving can be achieved, and driving noise during startup can be reduced. Therefore, for example, when applied to an air conditioning system for a vehicle, the switching from the outside air introduction to the inside air circulation of the intake door is performed at a high speed, and the switching from the outside air introduction to the inside air circulation such that a more unpleasant odor enters the vehicle interior is slow. Therefore, the mode door can be switched to the DEF mode at a high speed, so that cloudy or defrosting of the window can be started quickly.

According to the present invention, in addition to the above configuration, even when the stepping motor to be driven is not driven alone, the power supply voltage is increased to the predetermined voltage value by a plurality of simultaneous drives including the stepping motor to be driven. When it is estimated that the stepping motor does not become less than the above, the driving target stepping motor is driven in the low-torque high-speed driving mode from the start, so that even when a plurality of stepping motors are driven simultaneously, the driving target stepping motor is started. High-speed driving can be performed from the beginning, and opportunities for high-speed driving can be expanded.

Further, according to the present invention, in addition to the above configuration, when it is estimated that the power supply voltage becomes equal to or lower than a predetermined voltage value by a plurality of simultaneous drivings including the stepping motor to be driven, the stepping motor to be driven is Is a predetermined stepping motor, so that the predetermined stepping motor is driven independently in the low-torque high-speed drive mode from the start, so that the power supply voltage becomes equal to or lower than the predetermined voltage value by a plurality of simultaneous driving. Even in such a case, the predetermined stepping motor can be driven at a high speed from the start. Therefore, for example, when the predetermined stepping motor is used as the stepping motor of the intake actuator when applied to an air conditioning system for a vehicle, the switching from the outside air introduction to the inside air circulation of the intake door is performed at a high speed, and more unpleasant odors are generated in the vehicle interior. It is possible to reduce adverse effects caused by delay in switching from outside air introduction to inside air circulation, such as when air enters.

Further, according to the present invention, when the power supply voltage is equal to or higher than a predetermined voltage value allowing the first low-torque high-speed driving mode and a predetermined stepping motor is to be driven, a predetermined condition is satisfied. Is given, the predetermined stepping motor is set to the third driving frequency higher than the second driving frequency.
, The predetermined stepping motor can be driven at a higher speed, and the stepping motor can be driven at a higher speed. Therefore, for example, when the present invention is applied to a vehicle air-conditioning system, a predetermined stepping motor is used as a stepping motor of an intake actuator, and a predetermined condition is a case where a switch from outside air introduction to inside air circulation is required. Can be switched to internal air circulation at a higher speed, and the adverse effects caused by a delay in switching from external air introduction to internal air circulation, such as the introduction of more unpleasant odors into the vehicle interior, can be further reduced. Further, by setting the predetermined stepping motor as the stepping motor of the mode actuator and setting the predetermined condition to a case where the switching operation to the DEF mode is performed, the switching to the DEF mode can be performed at a higher speed. Clouding or defrosting can be initiated more quickly.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of an embodiment of the present invention.

FIG. 2 is a main flowchart of the control unit of FIG. 1;

FIG. 3 is a flowchart showing an actuator driving process in FIG. 2;

FIG. 4 is a flowchart illustrating another example of the actuator driving process in FIG. 2;

FIG. 5 is a flowchart showing another example of the actuator driving process in FIG. 2, and the terminals A, B, and C in FIG.
Are connected to the terminals having the same reference numerals in FIG.

FIG. 6 is a flowchart showing still another example of the actuator driving process in FIG. 2;

FIG. 7 is a flowchart showing still another example of the actuator driving process in FIG. 2;
E, F, G, and H are connected to the terminals having the same reference numerals in FIG.

FIG. 8 is a flowchart showing still another example of the actuator driving process in FIG. 2;

FIG. 9 is a flowchart showing still another example of the actuator driving process in FIG. 2;
J, K, and L are connected to the terminals having the same reference numerals in FIG.

[Explanation of symbols]

 Reference Signs List 1 control unit 7 intake actuator 8, 11, 14 stepping motor 9 intake door 10 mode actuator 12 mode door 13 air mix actuator 15 air mix door 60 outside air pollution degree detecting means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H02P 8/40 H02P 8/00 306 F term (Reference) 3L011 CH00 CL00 CP00 5H580 AA08 BB05 DD01 FA24 FB05 FC00 GG08

Claims (10)

[Claims] 1. A high-torque low-speed driving mode in which a driving mode of a stepping motor to be controlled is driven at a first driving frequency based on a power supply voltage, the driving mode being higher than the first driving frequency. A stepping motor control device that switches to a low-torque high-speed driving mode driven at a second driving frequency, wherein the power supply voltage is equal to or higher than a predetermined voltage value allowing the low-torque high-speed driving mode, and the stepping motor to be driven is A stepping motor control device having first driving means for driving the stepping motor to be driven in the low-torque high-speed driving mode from the time of startup when the single driving is performed. 2. When the power supply voltage is equal to or higher than a predetermined voltage value that allows the low-torque high-speed driving mode and the stepping motor to be driven does not operate alone, the stepping motor to be driven is set to the 2. The stepping motor control device according to claim 1, further comprising a second drive unit that starts up in a high torque low speed drive mode and switches to the low torque high speed drive mode after a predetermined time to drive. 3. The stepping motor to be driven when the power supply voltage is equal to or higher than a predetermined voltage value permitting the low-torque high-speed driving mode and the stepping motor to be driven is not driven alone. A second driving unit that drives the stepping motor to be driven in the low-torque high-speed driving mode from the time of startup, when it is estimated that the power supply voltage does not become lower than the predetermined voltage value due to simultaneous driving of The stepping motor control device according to claim 1, further comprising: 4. The method according to claim 2, wherein the second driving unit is configured to determine that the stepping motor to be driven is a predetermined stepping motor when the power supply voltage is estimated to be equal to or lower than the predetermined voltage value. 4. The stepping motor control device according to claim 3, wherein the stepping motor is independently driven preferentially in the low-torque high-speed driving mode from the start. 5. An actuator drive provided in an intake actuator for driving an intake door, a mode actuator for driving a mode door, and an air mix actuator for driving an air mix door in the vehicle air conditioning system, wherein the plurality of stepping motors are respectively provided. 4. The stepping motor according to claim 1, wherein:
The stepping motor control device according to any one of the above. 6. An actuator drive provided in an intake actuator for driving an intake door, a mode actuator for driving a mode door, and an air mix actuator for driving an air mix door, respectively, in the vehicle air conditioning system. The stepping motor control device according to claim 4, wherein the predetermined stepping motor is a stepping motor that drives an intake actuator. 7. A high-torque low-speed driving mode in which a plurality of stepping motors are driven based on a power supply voltage and a driving mode of the stepping motor to be driven is driven at a first driving frequency, or higher than the first driving frequency. In a stepping motor control device that switches to a first low-torque high-speed driving mode driven at a second driving frequency, the power supply voltage is equal to or higher than a predetermined voltage value that allows the first low-torque high-speed driving mode, and When a predetermined condition is given when the stepping motor to be driven is a predetermined stepping motor, a second low-torque high-speed driving mode for driving at a third driving frequency higher than the second driving frequency is provided. A stepping motor control device having driving means for driving the predetermined stepping motor. 8. A plurality of stepping motors, each of which is provided in an intake actuator for driving an intake door, a mode actuator for driving a mode door, and an air mix actuator for driving an air mix door in a vehicle air conditioning system. Wherein the predetermined stepping motor is a stepping motor for driving the intake actuator, and wherein the drive unit is configured to switch the intake air to the internal air circulation as the predetermined condition. The stepping motor control device according to claim 7, wherein the actuator is driven in the second low-torque high-speed driving mode. 9. A detecting means for detecting the degree of contamination of air outside the vehicle, wherein the switching from the introduction of the outside air to the circulation of the inside air is performed when a switching operation from the introduction of the outside air to the circulation of the inside air is performed, or 9. The stepping motor control device according to claim 8, wherein a request is made when the means detects a contamination degree equal to or more than a predetermined value. 10. An actuator drive provided on an intake actuator for driving an intake door, a mode actuator for driving a mode door, and an air mix actuator for driving an air mix door, wherein the plurality of stepping motors are respectively provided. Wherein the predetermined stepping motor is a stepping motor for driving the mode actuator, and the driving means controls the mode actuator when a switching operation to a DEF mode is performed as the predetermined condition. The stepping motor control device according to claim 7, wherein the stepping motor control device is driven in the second low torque high speed driving mode.