JP2000116179A - Air-conditioning controller with brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the load of a microcomputer in a control computing part by fitting a soft start processing part in an air-conditioning control part, and sending out a duty ratio which increases gradually at regular intervals from an initial value, that is, a duty ratio for which a driving pulse becomes minimum starting electric power to a control computing part as target revolutions. SOLUTION: The air-conditioning controlling part 10 of an air-conditioning controller is provided with the first soft start processing part 11, an indicated value reading means 23 for reading an FAN instruction signal, an initial value setting means 24, and a soft start value computing means 25. A pulse signal of a duty ratio which increases gradually at regular intervals from a preset initial value (e.g. 5.8%), based on the FAN instruction signal is sent out as target revolutions. The control computing part consisting of a microcomputer is provided with an input part 13 inputting the target revolutions, and another computing part 14 which computes, based on detected signals from respective magnetic sensors and outputs PWM signals to a driving circuit part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-conditioning control device using a brushless motor, and more particularly to an air-conditioning control device using a brushless motor that is performed by a control operation unit as a microcomputer without performing a soft start on the air-conditioning control unit.

[0002]

2. Description of the Related Art A motor for rotating a blower fan in an automobile air conditioner is a brushless motor in which a permanent magnet is used as a rotor, an armature winding is used as a stator, and a rectifying mechanism is replaced with a magnetic pole sensor and a switching element. It is becoming possible.

FIG. 15 is a schematic configuration diagram of a conventional automobile air conditioner. As shown in FIG. 15, the brushless motor 1 includes a fan unit provided near an air intake door 4 provided between an inside air introduction duct 2 for taking in inside air of an automobile and an outside air duct 3 for taking in outside air.
A motor main unit 5, a driving circuit unit 6 for supplying electric power having different phases to the motor main unit 5, a FAN instruction signal from an air conditioning control circuit 8, which will be described later, and a motor main unit 5.
And a microcomputer 7 that generates a control signal of a predetermined duty ratio to the drive circuit unit 6 based on a detection signal from a magnetic pole sensor (not shown) provided in the microcomputer. An evaporator E is provided near the motor body 5.

The aforementioned air conditioning control circuit 8 (also referred to as an AC amplifier) transmits detection signals from a water temperature sensor, a temperature sensor, an outside air sensor and the like (not shown) and an instruction signal from an operation panel 9 mounted on an instrument panel of the vehicle. The motor control circuit section 7 inputs a FAN instruction signal as shown in FIG. 16 for obtaining a target rotation speed of the motor from this instruction signal and detection signals from various sensors, and for obtaining the target rotation speed after a predetermined time. To send to.

[0005] In response to the input of the FAN instruction signal, the microcomputer 7 sends a control signal (output P) to the drive circuit section 6.
A soft start process in which the duty ratio of the WM signal is also gradually increased from 0, or a soft start process is performed (this time is referred to as a soft start time), and a control signal of a duty ratio that becomes a target rotation speed is transmitted.

The microcomputer 7 calculates the rotation speed of the rotor based on the detection signals from the respective magnetic sensors, and calculates an advance angle for obtaining an advance amount for advancing a delay angle with respect to the rotor according to the rotation speed. In addition, timing control for switching the current of the switching element in accordance with the advance amount is performed.

[0007]

However, in recent years, it has been attempted to provide microcomputers with various functions. For example, an advance angle control for calculating a rotation speed of a rotor based on a detection signal from each magnetic sensor and obtaining an advance amount for advancing a delay angle with respect to the rotor in accordance with the rotation speed. Timing control for switching the current of the switching element in response thereto, and soft start processing for gradually amplifying the output value and approaching the target value with the input of the FAN instruction signal (target value) are performed.

That is, there is a problem in that the microcomputer has various functions, so that the program of the microcomputer becomes complicated.

The soft start process is a program for gradually increasing the FAN instruction signal, which is a target value, and it is not an exaggeration to call it a FAN instruction signal.

However, conventionally, since the soft start is provided on the microcomputer side, there are problems that the program on the microcomputer side becomes complicated and an overload occurs.

The present invention has been made to solve the above problems, and has as its object to reduce the load on the microcomputer by providing a soft start process on the air conditioning control unit side.

[0012]

SUMMARY OF THE INVENTION The present invention is directed to a motor body in which a permanent magnet is a rotor, an armature winding is a stator, and a rectifying mechanism is replaced by a magnetic pole sensor and a switching element. The control signal for determining the duty ratio of the drive pulse to each phase coil is obtained from the detection signal from the controller and the control calculation unit for rotating the rotor. In an air conditioning control device using a brushless motor having an air conditioning control unit that sends out a target rotation speed determined based on the type, a first soft start processing unit is provided in the air conditioning control unit, and the first soft start processing unit is Before sending the target rotation speed to the control operation unit, the target rotation speed is input, and the input of the target rotation speed causes the drive pulse to become the minimum starting power of the rotor. To delivery the control arithmetic unit the duty ratio is increased gradually to a predetermined time interval from the initial value is a duty ratio as a target speed.

[0013]

As described above, according to the present invention, air conditioning control is not provided in a control operation unit for calculating a control signal for causing a motor main body of a brushless motor to reach a target rotation speed without providing a soft start process. The unit inputs the target rotation speed before the control calculation unit, and the duty which is gradually increased at regular intervals from an initial value which is a predetermined duty ratio for obtaining the minimum starting power of the rotor with this input. By performing the soft start process of sending the ratio as the target rotation speed to the control operation unit, the program on the microcomputer side is not complicated and the microcomputer side is not overloaded.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An air-conditioning control unit 11 of a brushless motor according to the present embodiment,
A soft start processing section for gradually increasing the FAN instruction signal after maintaining a predetermined initial value for a predetermined time is provided, and the soft start processing section has various functions described below. These functions will be described separately from the first, second,...

<First Embodiment> FIG. 1 is a schematic configuration diagram of an air conditioning control unit of a brushless motor according to a first embodiment. FIG.
The air-conditioning control unit 11 of the brushless motor includes a first soft start processing unit 11 that sequentially increases the FAN instruction signal from a predetermined initial value in response to the input of the FAN instruction signal.

The microcomputer 12 has an input unit 13 for inputting a FAN instruction signal from the soft start processing unit 11,
Advance angle control that calculates the rotation speed of the rotor based on the detection signal from each magnetic sensor and calculates the advance amount to advance the delay angle with respect to the rotor according to the rotation speed, according to the advance amount Another processing unit 14 including timing control for switching the current of the switching element is provided.

As shown in FIG. 2, the motor main body is provided with a magnet 16 (hereinafter referred to as a sensor magnet 16) for detecting rotation around one end of a shaft 15, and six magnets are provided around the sensor magnet 16. Salient poles 18a, 18
The stator 18 having b,... The above-mentioned sensor magnet 16 has a pair of N and N poles, and a pair of S and S poles, and is provided around one end of the shaft 15.

Also, the six salient poles 18a, 1
The coils 19a, 19b,... Are wound around 8b,. That is, a six-phase drive system is constituted by the six coils.

As shown in FIG. 2, the rotor 20 outside the stator 18 has main magnets 2 at 90-degree intervals.
1a, 21b,... The rotor 20 is rotatably connected to the other end (not shown) of the shaft 15 integrally with the shaft 15.

Further, on the stator 18, Hall elements 22a, 22b and 22c for detecting the direction of the magnetic field of the magnetic poles (S pole, N pole) of the sensor magnet 16 are uniformly arranged at 120 intervals.

On the other hand, the drive circuit section 6 generates drive signals for each phase obtained by level-converting the AND of the PWM signal with the duty ratio di of the PWM signal output from the microcomputer 12, and uses these drive signals to drive the power element. Drive to rotate the rotor.

The first soft start processing section 11
Is an instruction value reading means 23 for reading a FAN instruction signal;
When a FAN instruction value is read, a preset initial value (for example, a duty ratio of 5.8%) is read,
An initial value setting means 24 for setting the initial value do to the soft start value calculating means 25 is provided.

The soft start value calculation means 25 sends to the microcomputer 12 a FAN instruction signal (target rotation speed) having a duty ratio di gradually increased from the set initial value do at regular intervals.

That is, according to the first embodiment, when the FAN instruction signal is input, the duty ratio (5.8%) at which the motor immediately starts to have the minimum starting voltage as shown in FIG. ) To start the soft start operation.

For this reason, when the output PWM signal is sent to the drive circuit section 6, there is no period during which the motor does not rotate, so that power is not wasted in the soft start.

<Second Embodiment> The first soft start processing section 11 monitors the duty ratio (hereinafter referred to as output duty) of the output PWM signal, and this value is set to a preset lock determination value (rotor Reaches a value that is much lower than the target rotation speed), the rotation speed of the rotor is determined, and the rotation speed of the rotor becomes equal to or lower than the rotation speed that is significantly lower than the target rotation speed (lock determination rotation speed). If so, the motor is determined to be in the locked state and the rotation is stopped.

This will be specifically described with reference to FIG. FIG.
The horizontal axis represents time, the vertical axis represents the output duty ratio for lock determination, and the rotational speed Mi is plotted on a coordinate system in which the rotational speed Mi is plotted. The lock determination value is a value slightly higher than the value (5.8%) of the time “zero” of the soft start pattern.

As shown in FIG. 4, since the control is performed by the FAN instruction signal of the soft start pattern which gradually rises gradually from zero with a duty ratio di of 5.8%, the lock is performed even after the predetermined time ta has elapsed. Judgment value dp
It is as follows. At this time, in the initial stage of rotation, the rotor cannot be immediately followed, so the rotation speed of the rotor is still lower than the lock determination rotation speed Mp.

However, the first motor control unit 10 determines whether the duty ratio of the output PWM signal is equal to or less than the lock determination value dp and the rotation speed Mi is equal to or less than the lock determination rotation speed. For this reason, until the predetermined time ta, the locked state is determined and the rotation is stopped. That is, the rotation of the rotor is stopped even if there is no abnormality on the motor side.

Such a problem is solved in the second embodiment. FIG. 5 is a schematic configuration diagram of the second embodiment. In the second embodiment, only the main part is shown. That is,
A second soft start processing unit 30 shown in FIG. 5 is provided in place of the first soft start processing unit 11.

The second soft start processing unit 30 includes an instruction value reading unit 23 and an initial value setting unit 24 similar to those of the first embodiment, and further includes a soft start value calculating unit 31 and a first timer 32. , A memory 33, an initial value maintaining means 34, and a second timer 35.

The soft start value calculating means 31 sets the initial value do from the initial value setting means 24 therein, and outputs the initial value do to the microcomputer 12 until an initial value reading stop command is input from the initial value maintaining means 34. Send out.

Further, the soft start value calculating means 31
After the initial value reading stop command is input from the initial value maintaining means 34, the duty ratio di of the memory 33 corresponding to the measurement time of the first timer 32 is sent to the control value calculating means 26.

The initial value maintaining means 34 includes the initial value setting means 2
When 4 sets the initial value do in the soft start value calculation means 31, the first timer 32 is stopped and the second timer 35 is started. Then, an initial value read command is sent to the soft start value calculating means 31 at a constant interval (for example, 100 msec), and when the second timer 35 measures 1 second (for example, a time until reaching 50 rpm). Then, an initial value reading stop command is sent to the soft start value calculating means 31 and the first timer 32 is started.

That is, in the second embodiment, FIG.
As shown in (4), after the FAN instruction signal is input, the rotation speed is controlled for one second with the initial value do of the duty ratio of 5.8% to stabilize the rotation, and then the FAN instruction of the duty ratio based on the soft start pattern Pi is performed. The signal is sent to the microcomputer side. For this reason, for example, even if the rotation speed is less than the lock determination value at time t1 at the time of the low rotation instruction, the actual rotation speed has already exceeded the lock determination rotation speed, so that the locked state is not determined. Become.

<Embodiment 3> The aforementioned air conditioning controller 10
Determines the duty ratio using the voltage of the battery (hereinafter referred to as IGN voltage) that is sent out when the ignition is turned on. That is, the duty ratio changes due to the change in the IGN voltage. For example, when the IGN voltage decreases, the value of the duty ratio is changed from 5.8 to 10% in order to maintain the target rotation speed.

That is, as shown in FIG. 7, since the soft start pattern Pi becomes the rising pattern Pia due to the IGN fluctuation, the motor is determined to be in the locked state at the time t2 before reaching the time t2.

Embodiment 3 solves such a problem. FIG. 8 is a schematic configuration diagram of the third embodiment. The third embodiment includes a third soft start processing unit 40. The third soft start processing unit 40 includes a lock determination unit 4
1, a memory 42, a lock determination value changing unit 43, and a memory 44.

The lock judging means 41 reads the rotation speed and the output PWM signal from the microcomputer 12, and the duty ratio of this signal is equal to or less than the lock judgment value dp of the memory 44 and the rotation speed Mi is the lock judgment rotation speed of the memory 44. When the speed is equal to or lower than Mp, the motor body is determined to be in the locked state and the rotation is stopped.

The lock judgment value changing means 43 reads the IGN voltage Vi and changes the lock judgment value dp of the memory 42 to a lock judgment value dp corresponding to the IGN voltage Vi.

In the memory 44 described above, for example, the IGN voltage Vi is 12 V (a voltage that guarantees the minimum starting voltage of the present device).
In the case of, the pattern is stored in such a pattern that the lock determination value is 6.2 and 11% at 16V.

That is, in the third embodiment, as shown in FIG. 9, when the lock determination value is dp1, the IGN voltage V
When i decreases, the lock determination value is changed to dp1 (dp2> dp
Changed to 1).

For this reason, when the soft start pattern Pi rises to Pia with the fall of the IGN voltage, the lock state is not greater than the lock determination value dp1 at time t1, and the locked state is not determined. Further, when the soft start pattern Pi is used after one second as shown in the second embodiment, as shown in FIG. 9, even if the IGN voltage rises to become Pi, the lock determination value dp2 is obtained at time tp. Since the rotation reaches the rotation speed after the rotation is stabilized, the rotation speed Mi becomes equal to or higher than the lock determination rotation speed, and as a result, the lock determination is not performed.

<Fourth Embodiment> In general, when the temperature of a motor is low, the number of revolutions tends to decrease. At the time of initial rotation, the target number of revolutions is not easily reached, so that wind may not be sent from the FAN. Conversely, when the temperature is high, the number of revolutions tends to increase, and the number of revolutions suddenly increases at the initial rotation, and a beat sound may be generated.

For this reason, when the temperature decreases, as shown in FIG.
When the duty ratio di of the M signal is equal to or less than the lock determination value dp,
If the rotation speed is equal to or lower than the lock determination rotation speed Mp, it is determined that the vehicle is locked.

Embodiment 4 solves such a problem. FIG. 11 is a schematic configuration diagram of the fourth embodiment. In the fourth embodiment, only the main part will be described. The fourth soft start processing unit 50 according to the fourth embodiment inputs the temperature of the motor main body side detected by a temperature sensor (not shown), and the lock determination rotation speed Mp corresponding to this temperature.
Is detected from the memory 52, and the lock determination rotational speed Mp of the memory 42 is changed to the detected lock determination rotational speed Mp.

That is, in the fourth embodiment, as shown in FIG. 12, even if the temperature decreases and the rotation speed Mi becomes the rotation speed Mia, the lock determination rotation speed changing means 51 responds in advance to the lowered temperature. Lock determination rotation speed Mp to be stored in memory 5
2, the lock determination rotation speed Mp of the memory 42 is changed to the detected lock determination rotation speed Mp.

For this reason, for example, when the soft start control is performed with the soft start pattern Pi, the time t
Even if the soft start pattern Pi is equal to or less than the lock determination value dp at p, since the lock determination rotation speed Mp1 of the memory 42 is set to the low rotation speed Mp2, it is determined that the rotation speed Mia exceeds the lock determination rotation frequency Mp2. As a result, the locked state is not determined.

<Fifth Embodiment> In the fourth embodiment, the number of lock determinations is changed according to the temperature. However, the initial value do of the soft start pattern Pi may be changed according to the temperature. .

FIG. 13 is a schematic configuration diagram of the fifth embodiment. In the fifth embodiment, in addition to the above configuration, the initial value changing means 6
1, the initial value changing means 61 reads the detected temperature ki on the motor body side, extracts an initial value do corresponding to the temperature ki from the memory 62, and reads the initial value do of the memory 24.
Is changed to the extracted initial value do.

That is, in the fifth embodiment, the initial value changing means 61 sets the initial value do corresponding to the detected temperature in the memory 24, and sets the initial value do corresponding to this temperature to the initial value setting means 24. Set in the soft start value calculation means 31. Then, the soft start value calculation means 31 rotates the motor at a value based on the soft start pattern Pi using the initial value do corresponding to the temperature.

For this reason, as shown in FIG. 14, even if the rotational speed Mi fluctuates depending on the temperature, the soft start pattern Pi is obtained.
The overall level fluctuates.

Therefore, for example, as shown in FIG. 14, when the initial value do is set to doa, when the temperature decreases and the number of rotations becomes Mia, the soft start pattern becomes Pia, and at time ta, The lock state is determined to be the lock state when the lock determination value dp or less and the rotation speed Mia is equal to or less than the lock determination rotation speed Mp, but the initial value do is set to dob (doa).
> Doa), the soft start pattern becomes Pib, and reaches the lock determination value dp at time tb (ta> tb). That is, the lock determination value dp is reached later than the initial value dia. For this reason, since the rotation speed of the motor is stabilized, when the lock determination value dp is reached, the lock determination rotation speed Mp is exceeded, and the lock state is not determined.

The initial value do is doc (doa> do).
If a> doc), the soft start pattern becomes Pic, and reaches the lock determination value dp at time tc (tc>ta> tb). That is, the initial value dib
The lock determination value dp is reached even later than in the case of.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air-conditioning control unit of a brushless motor according to a first embodiment.

FIG. 2 is a configuration diagram of a main body of the brushless motor.

FIG. 3 is an explanatory diagram illustrating a soft start according to the first embodiment;

FIG. 4 is an explanatory diagram for explaining a problem of the first embodiment;

FIG. 5 is a schematic configuration diagram of a second soft start processing unit of the air conditioning control unit according to the second embodiment.

FIG. 6 is an explanatory diagram illustrating an effect of maintaining an initial value according to the second embodiment.

FIG. 7 is an explanatory diagram for explaining a problem of a soft start due to an IGN voltage fluctuation.

FIG. 8 is a schematic configuration diagram of a third soft start processing unit of the air conditioning control unit according to the third embodiment.

FIG. 9 is an explanatory diagram illustrating an effect of a change in a lock determination value due to an ING voltage change according to the third embodiment.

FIG. 10 is an explanatory diagram illustrating a problem of a soft start due to a temperature drop.

FIG. 11 is a schematic configuration diagram of a fourth soft start processing unit of the air conditioning control unit according to the fourth embodiment.

FIG. 12 is an explanatory diagram illustrating an effect obtained by changing a lock determination rotation speed due to a temperature change.

FIG. 13 is a schematic configuration diagram of a fifth soft start processing unit of the air conditioning control unit according to the fifth embodiment.

FIG. 14 is an explanatory diagram illustrating an effect obtained by changing an initial value according to the fifth embodiment.

FIG. 15 is a schematic configuration diagram of a conventional air conditioning control device.

FIG. 16 is an explanatory diagram illustrating a FAN instruction signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Air-conditioning control part 23 Instruction value reading means 24 Initial value setting means 25 Soft start value calculating means 30 Second soft start processing part 31 Soft start value calculating means 34 Initial value maintaining means 43 Lock judgment value changing means

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tsuyoshi Sekine 5-24-15 Minamidai, Nakano-ku, Tokyo Calsonic Corporation F-term (reference) 3H021 AA01 BA02 BA20 CA10 DA07 EA12 3L061 BE02 BF06 5H560 AA01 BB04 BB12 DA02 DA19 DB20 DC05 GG04 HA01 JJ19 SS02 XA04 XA12

Claims (7)

[Claims] 1. A motor body in which a permanent magnet is a rotor, an armature winding is a stator, and a rectifying mechanism is replaced by a magnetic pole sensor and a switching element. A control signal for determining a duty ratio of a drive pulse to the phase coil is obtained, and a control operation unit (12) for rotating the rotor is controlled based on detection signals from various sensors and the type of air blown. An air-conditioning control device using a brushless motor having an air-conditioning control unit (8) for transmitting the target rotation speed determined in step (1), wherein the target rotation speed is transmitted to the control calculation unit (12) before the target rotation speed is transmitted. With the input of the target number of revolutions, the drive pulse is gradually increased at regular intervals from an initial value that is a predetermined duty ratio for becoming the minimum starting power of the rotor. Air conditioning control apparatus using a brushless motor, characterized in that it comprises a first soft start processing unit that the duty ratio is sent to the control arithmetic unit (12) as the target rotational speed (11) to the air conditioning control unit has. 2. The first soft start processing section (1)
1) The first is when the duty ratio of the control signal is in a rotation stopped state.
When the rotation speed of the rotor is equal to or less than the lock determination value and the rotation speed of the rotor is equal to or lower than a first lock determination rotation speed that is lower than a reference rotation speed, the lock determination unit (4)
2. An air conditioning control device using a brushless motor according to claim 1, wherein the air conditioner control device includes: 3. A first initial value, which is a reference duty ratio for the drive pulse to become the minimum starting power of the rotor, in accordance with the input of the target rotation speed, is set as a target rotation speed for a predetermined time. A second soft start processing unit (30) for transmitting, as the value of the target rotation speed, a duty ratio gradually increased from the first initial value at regular time intervals from the first initial value to the air conditioning control unit after the transmission and the transmission. An air-conditioning control device using the brushless motor according to claim 1. 4. The second soft start processing section (3)
0) is characterized in that the predetermined time for maintaining the first initial value is a time obtained by adding a time when the rotation speed of the rotor reaches a first lock determination rotation speed and the fixed time. An air conditioning control device using the brushless motor according to claim 3. 5. The power supply voltage is detected by previously associating a different second lock determination value with each voltage value in a power supply voltage fluctuation range, and the second power supply voltage corresponding to the power supply voltage is detected.
The air-conditioning control device using a brushless motor according to claim 1, wherein the air-conditioning control unit includes a third soft start processing unit (40) that changes the first lock determination value to the lock determination value. . 6. The temperature is detected by associating an arbitrary second lock determination rotation speed with each temperature value in a temperature fluctuation range of the motor body, and a second temperature corresponding to the detected temperature is detected. The air-conditioning using a brushless motor according to claim 1, wherein the air-conditioning control unit includes a fourth soft start processing unit (50) that changes the first lock determination rotation speed to the lock determination rotation speed. Control device. 7. A method for detecting a temperature by previously associating a second initial value of a different value with each temperature value in a temperature fluctuation range, and setting the second initial value corresponding to the detected temperature to the second initial value. The air conditioning control device using a brushless motor according to claim 1, wherein a fifth soft start processing unit for changing a first initial value is provided in the air conditioning control unit.