JP2010239753A - Motor control device, state detection method, and apparatus control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively detect abnormal conditions more in detail at the side of an air-conditioning ECU (control device). <P>SOLUTION: A control means performs control so that one of first and second voltages is applied to a command signal line 32 when a normal state is detected by the protection circuit 55, and the other of the first and second voltages is applied to the command signal lines 32 when the abnormal conditions are detected by the protection circuit 55. Thus, the abnormal conditions can inexpensively be detected more in detail at the side of the control device. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a motor control device, a state detection method, and a device control device.

  Conventionally, an automobile control device capable of detecting an abnormality is known (see, for example, Patent Document 1). The automobile control device described in Patent Document 1 includes a signal line for transmitting the calculation result to the host ECU and a communication line for transmitting normal / abnormal information INF indicating normal / abnormal of the CPU or IPM to the ECU. Two lines are provided.

  Conventionally, there has been known a motor control device that determines whether or not an abnormal overheating has occurred in a motor without providing a special signal line between the motor controller and a control means higher than the motor controller ( For example, see Patent Document 2).

Japanese Patent Laid-Open No. 2005-27441 JP 2004-248438 A

  However, the technique described in Patent Document 1 requires two lines (a signal line and a communication line), which is costly, and has two lines compared to the case where one line is attached. There is a problem that it takes time to attach the wire.

  In the technique described in Patent Document 2, it is possible to determine whether or not the motor is abnormally overheated on the host device side, but it is desirable to detect the abnormal state in more detail on the host device side. There is a request.

  The present invention has been made in view of the above circumstances, and a motor control device and a state detection method capable of detecting an abnormal state in more detail on the control device (higher level device) side without cost. And an apparatus control device.

  In order to achieve the above object, a motor control device according to claim 1 is applied to a voltage source for applying a first voltage and a second voltage to a command signal line, and to the command signal line. A detecting means for detecting an abnormal state by detecting the detected voltage and a switching means provided between the command signal line and a portion having a reference potential, and a voltage is applied to the command signal line from the voltage source. A control device comprising control means for controlling on / off of the switching means in accordance with a duty ratio corresponding to a target rotational speed of the motor based on the voltage value detected by the detection means, Driving means for driving the motor based on a drive command signal generated according to the voltage state of the command signal line in a state where the motor is on / off controlled, the motor and the drive Detecting means for detecting whether the stage is in a normal state or whether at least one of the motor and the driving means is in an abnormal state; and when the normal state is detected by the detecting means, the first voltage and the second voltage Is applied to the command signal line, and when the abnormal state is detected by the detection means, the other of the first voltage and the second voltage is applied to the command signal line. And control means.

  According to the first aspect of the present invention, when the control unit detects a normal state, one of the first voltage and the second voltage is applied to the command signal line, and an abnormal state is detected. In addition, control is performed so that the other of the first voltage and the second voltage is applied to the command signal line. And a detection means detects an abnormal state by detecting the voltage applied to the command signal line.

  Therefore, according to the first aspect of the present invention, the abnormal state can be detected in more detail on the control device side without cost.

  In order to achieve the above object, a motor control device according to a second aspect of the invention includes a voltage source for applying the first voltage and the second voltage to the command signal line, and the command signal line. Detection means for detecting an abnormal state by detecting an applied voltage, and first switching means provided between the command signal line and a portion having a first reference potential, the command signal line Control for turning on and off the first switching means according to a duty ratio corresponding to a target rotational speed of the motor based on the voltage value detected by the detection means in a state where a voltage is applied from the voltage source to And a drive for driving the motor based on a drive command signal generated according to a voltage state of the command signal line in a state where the first switching unit is ON / OFF controlled. The motor and the driving means are in a normal state, or at least one of the motor and the driving means is in a first abnormal state in which the operation is temporarily restricted, or the motor and the driving means Detection means for detecting whether at least one of the means is in a second abnormal state in which the operation is stopped; and second switching means provided between the command signal line and a portion having a second reference potential When a normal state is detected by the detection means, one of the first voltage and the second voltage is applied to the command signal line and the second switching means is turned off, and the detection When the first abnormal state is detected by the means, the other of the first voltage and the second voltage is applied to the command signal line, and the second switching means is turned off. Controls as the second abnormal state by said detecting means when it is detected, is configured to include a control means for turning on the second switching means.

  According to the invention described in claim 2, when the control means detects the normal state by the detection means, one of the first voltage and the second voltage is applied to the command signal line, and the second When the switching means is turned off and the first abnormal state is detected by the detection means, the other of the first voltage and the second voltage is applied to the command signal line and the second switching means is turned off. And when the second abnormal state is detected by the detecting means, the second switching means is controlled to be turned on. And a detection means detects an abnormal condition by detecting the voltage applied to the command signal line.

  Therefore, according to the second aspect of the present invention, the abnormal state can be detected in more detail on the control device side without cost.

  According to a third aspect of the present invention, there is provided the motor control device according to the first aspect, wherein the drive command signal is detected when a normal state is detected by the detection device. And the first threshold value for obtaining the duty ratio in the normal state, the drive of the motor is controlled based on the control signal obtained and the abnormal state is detected by the detecting means In this case, the drive of the motor is controlled based on a control signal obtained by comparing the drive command signal with a second threshold value for obtaining a duty ratio in the abnormal state. is there. Thus, by changing the threshold value for obtaining the duty ratio between the normal state and the abnormal state, the drive of the motor can be controlled more accurately.

  According to a fourth aspect of the present invention, there is provided the motor control device according to the second aspect, wherein the drive command signal is detected when a normal state is detected by the detection device. And the first threshold value for determining the duty ratio in the normal state, the drive of the motor is controlled based on the control signal obtained by comparing the first threshold value and the first abnormal state by the detecting means. When detected, the drive of the motor is controlled based on a control signal obtained by comparing the drive command signal with a second threshold value for obtaining a duty ratio in the case of the first abnormal state. It is what you do. In this way, the drive of the motor can be controlled more accurately by changing the threshold value for obtaining the duty ratio between the normal state and the first abnormal state.

  A motor control device according to a fifth aspect of the invention is the motor control device according to the first or second aspect, wherein the reference potential is 0V.

  According to a sixth aspect of the present invention, there is provided the motor control device according to the third or fourth aspect, wherein the first reference potential and the second reference potential are set to 0V. It is. Thereby, in the case of the second abnormal state, the supply of electric power to the motor is interrupted.

  In order to achieve the above object, the state detection method according to claim 7 is applied to the command signal line by a voltage source for applying the first voltage and the second voltage to the command signal line. A detecting means for detecting a state by detecting the detected voltage and a switching means provided between the command signal line and a portion having a reference potential, and a voltage is applied to the command signal line from the voltage source. The switching means of the control device includes a control means for controlling on / off of the switching means according to a duty ratio according to a target rotational speed of the motor based on the voltage value detected by the detection means. Drive means for driving the motor based on a drive command signal generated according to the voltage state of the command signal line in a state where the on / off control is performed, and the motor is normal When at least one of the driving means and the motor is in an abnormal state, and when a normal state is detected, one of the first voltage and the second voltage is applied to the command signal line. When an abnormal state is detected, control is performed so that the other of the first voltage and the second voltage is applied to the command signal line.

  According to the seventh aspect of the present invention, when the normal state is detected, one of the first voltage and the second voltage is applied to the command signal line, and the first state is detected when the abnormal state is detected. The other of the second voltage and the second voltage is controlled to be applied to the command signal line. Then, the abnormal state is detected by detecting the voltage applied to the command signal line.

  Therefore, according to the seventh aspect of the invention, it is possible to detect the abnormal state in more detail on the control device side without incurring costs.

  In order to achieve the above object, the state detection method according to the present invention is applied to the command signal line by a voltage source for applying the first voltage and the second voltage to the command signal line. Detection means for detecting a state by detecting the generated voltage and first switching means provided between the command signal line and a portion having a first reference potential, and the command signal line includes the first switching means. Control means for on / off controlling the first switching means in accordance with a duty ratio corresponding to a target rotational speed of the motor based on a voltage value detected by the detection means in a state where a voltage is applied from a voltage source. Drive means for driving the motor based on a drive command signal generated in accordance with a voltage state of the command signal line in a state where the first switching means of the control device provided is ON / OFF controlled In addition, the motor is in a normal state, at least one of the driving means and the motor is temporarily restricted to be in a first abnormal state capable of self-recovery, or at least one of the driving means and the motor is in operation. When the normal state is detected, one of the first voltage and the second voltage is applied to the command signal line, and the command signal When the second switching means provided between the line and the portion having the second reference potential is turned off and the first abnormal state is detected, the first voltage and the second voltage The other switching voltage is applied to the command signal line and the second switching means is controlled to be turned off, and when the second abnormal state is detected, the second switching means is Turn on To control such.

  According to the invention described in claim 8, when a normal state is detected, one of the first voltage and the second voltage is applied to the command signal line and the second switching means is turned off. When the first abnormal state is detected, control is performed so that the other of the first voltage and the second voltage is applied to the command signal line and the second switching means is turned off. When an abnormal state is detected, control is performed to turn on the second switching means. Then, the abnormal state is detected by detecting the voltage applied to the command signal line.

  Therefore, according to the eighth aspect of the present invention, it is possible to detect the abnormal state in more detail on the control device side without cost.

  In order to achieve the above object, an apparatus control device according to a ninth aspect of the present invention transmits a drive command signal from a first control device to a second control device via a command signal line, and the second control In the device control device that controls the drive of the control target device based on the drive command signal transmitted from the device, the second control device detects whether the second control device is in a normal state or an abnormal state. One of the first voltage and the second voltage of the voltage source for applying the first voltage and the second voltage when a normal state is detected by the abnormal state detection unit and the state detection unit Is applied to the command signal line, and control is performed so that the other of the first voltage and the second voltage is applied to the command signal line when the abnormal state is detected by the state detection means. Means for providing the first control. Device is a device control apparatus characterized by comprising a detecting means for detecting an abnormal state by detecting a voltage applied to the command signal lines.

  According to the ninth aspect of the present invention, when the control unit detects a normal state, one of the first voltage and the second voltage is applied to the command signal line, and an abnormal state is detected. In addition, control is performed so that the other of the first voltage and the second voltage is applied to the command signal line. And the detection means of a 1st control apparatus detects an abnormal condition by detecting the voltage applied to the command signal line.

  Therefore, according to the ninth aspect of the invention, it is possible to detect the abnormal state in more detail on the first control device side without incurring costs.

It is a block diagram which shows the outline of a structure of the air conditioner which concerns on the 1st Embodiment of this invention. It is a lineblock diagram of a blower motor device concerning a 1st embodiment of the present invention. It is a circuit diagram showing the outline of the composition of the important section of the motor control device concerning a 1st embodiment of the present invention. It is a figure which shows the relationship between the ECU output of the normal state (normal time) and the electric potential of a command signal line in the 1st Embodiment of this invention. It is a figure which shows the relationship between the ECU output of the abnormal state in the 1st Embodiment of this invention, and the electric potential of a command signal line. It is a flowchart of the state detection process which the microcomputer concerning the 1st Embodiment of this invention performs. It is a circuit diagram which shows the outline of a structure of the principal part of the motor control apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart of the state detection process which the microcomputer which concerns on the 2nd Embodiment of this invention performs. It is a figure which shows the electric potential of the command signal line of the 2nd abnormal state in the 2nd Embodiment of this invention. ECU output and command in each state of normal state (normal time), first abnormal state (first abnormal time), and second abnormal state (second abnormal time) in the second embodiment of the present invention It is a figure which shows the relationship with the electric potential of a signal line.

  Hereinafter, embodiments of a motor control device of the present invention will be described in detail with reference to the drawings. In each embodiment, an example in which the present invention is applied to an air conditioner ECU and a blower motor device of an air conditioner (air conditioner) mounted on a vehicle will be described.

[First Embodiment]
First, the first embodiment will be described. As shown in FIG. 1, the air conditioner 10 of the present embodiment includes an air conditioner ECU (Electronic Control Unit) 12 and a blower motor device 14. The air conditioner ECU 12 and the blower motor device 14 operate by supplying power from a power source 16 having a predetermined value, for example, 5V. The air conditioner ECU 12 and the blower motor device 14 are examples of the motor control device and the device control device of the present invention. The air conditioner ECU 12 is an example of the control device and the first control device of the present invention, and further, the blower motor device. 14 is an example of the second control device of the present invention.

  As shown in the figure, the air conditioner ECU 12 and the blower motor device 14 are connected by a command signal line 32.

  The air conditioner ECU 12 (upper air conditioner control device) sends a drive command signal (motor drive command signal) S1 for operating commands to the blower motor device 14 based on an operation signal from an operation switch (not shown). 32. In the present embodiment, the blower motor device 14 is configured to perform a normal operation based on the drive command signal S1. In the present embodiment, the drive command signal S1 has a pulse having a duty ratio corresponding to the target rotation speed. For example, if the target rotation speed increases, the duty ratio also increases correspondingly. In the present embodiment, the target rotational speed changes according to the states of the motor 18 and the motor controller 20, for example. That is, the target rotation speed is a speed based on the state of the motor 18 and the motor controller 20.

  The blower motor device 14 includes a motor 18 having a fan (not shown) attached to an output shaft, and a motor controller 20 that outputs a drive signal S3 to the motor 18. The motor 18 is an example of a control target device of the present invention.

  Upon receiving the drive command signal S1 from the air conditioner ECU 12, the motor controller 20 outputs a drive signal S3 to the motor 18 to drive the motor 18 to rotate. That is, the motor controller 20 controls the rotational drive of the motor 18.

  The motor 18 of the present embodiment is a brushless motor, and is controlled to rotate at a motor rotation speed corresponding to the duty ratio by receiving a rectangular wave voltage signal having a predetermined duty ratio from the motor controller 20. In the present embodiment, the motor 18 is a brushless motor provided with a hall sensor (not shown), but the present invention is not limited to this and may be another type of electric motor. . For example, the motor 18 may be a brushed motor having a commutator.

  The motor 18 of the present embodiment includes a stator (not shown) having a three-phase winding (not shown) and a rotor (not shown) having a rotor magnet. The stator is provided with a hall sensor (not shown). As shown in FIG. 2, a sensor output corresponding to the rotation of the rotor is output to the drive circuit 22 of the motor controller 20 by the hall sensor. ing. Thereby, conventionally known feedback control is performed by the motor controller 20.

  As shown in FIG. 2, the motor controller 20 of the present embodiment generates a control signal (PWM signal) S2 having a duty ratio based on an input signal from the outside (drive command signal S1 in the present embodiment). A rotation control circuit 24 for outputting, and a drive circuit 22 for supplying a rectangular wave voltage signal (drive signal S3) having a different phase to each phase winding of the motor 18 based on the control signal S2 and the sensor output from the Hall sensor. ing.

  The rotation control circuit 24 of the present embodiment is configured by one or a plurality of custom ICs (Integrated Circuits), and causes the motor to reach the motor rotation speed that is a target value set by the drive command signal S1. A control signal S2 is sent out.

  Further, the drive circuit 22 of the present embodiment has a known configuration, and a predetermined number, for example, six resistors (not shown) and a predetermined number, for example, six power elements (not shown). Are wired on the substrate. The drive circuit 22 turns on / off these power elements by a control signal S2 from the rotation control circuit 24, and connects the power source 16 to the windings at a predetermined timing to generate a rotating magnetic field. That is, the drive circuit 22 controls the rotational drive of the motor 18 based on the control signal S2. At this time, feedback control is performed based on the sensor output from the Hall sensor so that the motor 18 performs appropriate rotational driving. The motor controller 20 is an example of the driving means of the present invention.

  Here, with reference to FIG. 3, the interface part of air-conditioner ECU12 and the blower motor apparatus 14 is demonstrated in detail. The air conditioner ECU 12 includes an output unit 26 and a detection unit 27.

  The output unit 26 is a circuit including an npn type transistor 28. The emitter terminal of the transistor 28 is grounded, and the collector terminal is connected to one end of the command signal line 32 via a resistor (for example, a resistor having a resistance value of 100Ω) 30. That is, the transistor 28 is provided between the command signal line 32 and a portion (ground) having a reference potential (0 V). The other end of the command signal line 32 is connected to the motor controller 20 of the blower motor device 14. Thereby, as shown in FIG. 3, air-conditioner ECU12 and the motor controller 20 are electrically connected.

  Further, the base terminal of the transistor 28 drives the motor 18 based on the operation signal from the operation switch in the air conditioner ECU 12 and the state of the motor 18 and the motor controller 20 detected by the detection unit 27 described in detail below. A command signal generation circuit (not shown) for generating a command signal (ECU output) is connected. Thereby, a command signal (ECU output) for driving the motor 18 generated based on the operation signal from the operation switch in the air conditioner ECU 12 is input to the base terminal of the transistor 28. Therefore, when a low level signal is input to the base terminal of the transistor 28, the collector terminal and the emitter terminal of the transistor 28 are turned off (non-conducting), and a high level signal is applied to the base terminal of the transistor 28. When it is input, the collector terminal and the emitter terminal of the transistor 28 are turned on (conductive). That is, the command signal generation circuit performs on / off control of the transistor 28 according to the duty ratio according to the target rotation speed of the motor 18 based on the state detected by the detection unit 27. The command signal generation circuit is an example of the control means of the present invention, and the transistor 28 is an example of the switching means and the first switching means of the present invention.

  The detection unit 27 includes a CR filter 27a, an A / D conversion unit (not shown), and a microcomputer (not shown). The input terminal 27a_i of the CR filter 27a is connected to one end of the command signal line 32 and the part 31 of the resistor 30, and thereby the voltage applied to the command signal line 32 can be detected. The CR filter 27a smoothes the voltage input to the input terminal 27a_i, and outputs the smoothed analog voltage from the output terminal 27a_o of the CR filter 27a to the A / D converter. The A / D converter digitizes the input analog voltage and outputs a digital value voltage to the microcomputer. The microcomputer determines whether the state of the motor 18 and the motor controller 20 is normal or whether at least one of the motor 18 and the motor controller 20 is abnormal based on the input digital value voltage. The state of the controller 20 is detected. Then, the microcomputer outputs the determination result to the command signal generation circuit. As a result, the command signal generation circuit performs on / off control of the transistor 28 according to the duty ratio corresponding to the target rotation speed of the motor 18 based on the state detected by the detection unit 27. For example, the command signal generation circuit performs on / off control of the transistor 28 so that the motor 18 performs driving suitable for each state in the normal state and in the abnormal state.

  On the other hand, the motor controller 20 includes a filter circuit 38 that is an integrating circuit including a resistor (for example, a resistor having a resistance value of 30Ω) 34 and a capacitor (for example, a capacitor having a capacitance of 1000 pF) 36. The input terminal is connected to the other end of the command signal line 32. The output terminal of the filter circuit 38 is connected to the connection terminal 42 via a resistor 40 (for example, a resistor having a resistance value of 180Ω). The connection terminal 42 is connected to the other end of a pull-up resistor (for example, a resistor having a resistance value of 2 kΩ) 44 having one end connected to the output terminal of an operational amplifier (OP amplifier) 43. The connection terminal 42 is connected to the non-inverting input terminal of the comparator a. One end of a resistor 47 (for example, a resistor having a resistance value of 10 kΩ) 47 is connected to the connection terminal 45 between the pull-up resistor 44 and the operational amplifier 43. One end of a resistor (for example, a resistor having a resistance value of 10 kΩ) 49 is connected to the other end of the resistor 47. The other end of the resistor 49 is grounded.

  A part 51 between the resistor 47 and the resistor 49 is connected to the inverting input terminal of the comparator a. Thereby, when the switch 53 described in detail below is connected to the first power supply (5V) 57 described in detail below, for example, the voltage divided by the resistor 47 and the resistor 49, for example, 2 A voltage of .5V (the first threshold value for obtaining the duty ratio in the normal state, which is the potential of the part 51) is input to the inverting input terminal of the comparator a. For example, when the switch 53 is connected to a second power source (2.5V) 59, the details of which will be described below, a voltage divided by the resistors 47 and 49, for example, a voltage of 1.25V (part The second threshold value for obtaining the duty ratio in the case of an abnormal state) is input to the inverting input terminal of the comparator a. The output terminal of the comparator a is connected to the input terminal of the rotation control circuit 24.

  When the voltage input to the inverting input terminal and the S1 potential (the potential of the connection terminal 42) are compared from the output terminal of the comparator a, and the S1 potential is equal to or higher than the voltage input to the inverting input terminal. Outputs a high level signal, and outputs a low level signal when the S1 potential is less than the voltage input to the inverting input terminal.

  That is, the comparator a and the rotation control circuit 24 described above, based on the control signal S2 obtained by comparing the drive command signal S1 and the first threshold value for obtaining the duty ratio in the normal state, the motor 18. And the drive of the motor 18 is controlled based on the control signal S2 obtained by comparing the drive command signal S1 with the second threshold value for obtaining the duty ratio in the abnormal state.

  Further, the blower motor device 14 of the present embodiment includes a first power supply 57 for applying a first voltage (for example, 5 V) to the command signal line 32 via the resistor 40 and the filter circuit 38, and a second power supply 57. Is provided with a second power source 59 for applying the voltage (for example, 2.5 V) to the command signal line 32 via the resistor 40 and the filter circuit 38. The first power source 57 and the second power source 59 correspond to an example of the voltage source of the present invention.

  The switch 53 is connected to the input terminal of the operational amplifier 43 and the protection circuit 55. The switch 53 is connected to the first power supply 57 when a signal indicating an instruction to connect to the first power supply 57 is input from the protection circuit 55. Thereby, a first voltage (for example, 5 V) is applied to the command signal line 32. The switch 53 is connected to the second power supply 59 when a signal indicating an instruction to connect to the second power supply 59 is input from the protection circuit 55. Thereby, the second voltage (for example, 2.5 V) is applied to the command signal line 32.

  Although the protection circuit 55 does not show the connection state or the like, the protection circuit 55 includes a conventionally known technique, and the state of the motor 18 and the motor controller 20 is normal, or at least one of the motor 18 and the motor controller 20. It is detected whether the state of is abnormal. This technique is described in a plurality of documents, but is described in, for example, Japanese Patent Application Laid-Open No. 2005-51993. The protection circuit 55 of the present embodiment is an abnormal state, for example, when the temperature in the motor 18 or the motor controller 20 rises or when the power supply to the motor controller 20 is insufficient. If such a situation returns to a normal state (a state in which the temperature has been sufficiently lowered after cooling and a state in which the power supply is satisfied), an abnormal state in which the control returns to the normal drive command signal is detected. That is, the abnormal state for self-recovery is an abnormal state in which the operation is temporarily restricted. The abnormal state in which the operation is temporarily limited corresponds to an example of the first abnormal state of the present invention.

  When the protection circuit 55 detects that the motor 18 and the motor controller 20 are in the normal state, the protection circuit 55 outputs a signal indicating an instruction to connect to the first power supply 57 to the switch 53. Further, when the protection circuit 55 detects that at least one of the motor 18 and the motor controller 20 is in an abnormal state, the protection circuit 55 outputs a signal indicating an instruction to connect to the second power supply 59 to the switch 53. The protection circuit 55 corresponds to an example of the detection unit of the present invention and constitutes a part of the control unit of the present invention.

  By operating the protection circuit 55 in this way, the switch 53 detects that an abnormal state is detected by the protection circuit 55 when the normal state is detected by the protection circuit 55 and the first voltage is applied to the command signal line 32. In such a case, control is performed so that the second voltage is applied to the command signal line 32. The switch 53 constitutes a part of the control means of the present invention.

  Here, the ECU output and the S1 potential when the normal state is detected by the protection circuit 55 and the switch 53 is controlled to apply the first voltage to the command signal line 32 will be described with reference to FIG. When the signal (ECU output) 70 shown in FIG. 4A is input to the base terminal of the transistor 28, the potential S1 (the potential of the connection terminal 42) as shown in FIG. Although the pull-up resistor 44 is connected to the connection terminal 42, the potential of the portion corresponding to the ON of the ECU output does not become 0V (that is, does not drop completely to 0V), and the ECU output The reason why the potential of the portion corresponding to OFF does not become 5V (that is, does not rise to 5V completely) may be because the signal line includes a resistor. In FIG. 4B, the potential of the portion 51 input to the inverting input terminal of the comparator a is indicated by a wavy line.

  Next, ECU output and S1 potential when the protection circuit 55 detects an abnormal state and the switch 53 controls the second voltage to be applied to the command signal line 32 will be described with reference to FIG. When the signal (ECU output) 72 shown in FIG. 5A is input to the base terminal of the transistor 28, the potential S1 (the potential of the connection terminal 42) as shown in FIG. Although the pull-up resistor 44 is connected to the connection terminal 42, the potential of the portion corresponding to the ON of the ECU output does not become 0V (that is, does not drop completely to 0V), and the ECU output The reason why the potential of the portion corresponding to OFF does not become 2.5V (that is, does not rise up to 5V completely) can be considered because the signal line includes a resistor as described above. In FIG. 5B, the potential of the part 51 input to the inverting input terminal of the comparator a is indicated by a wavy line.

  Here, the operation of the microcomputer of the detection unit 27 will be described with reference to the flowchart shown in FIG. FIG. 6 shows a flowchart showing a state detection process executed by the microcomputer. This state detection process is executed at predetermined time intervals after power switches (not shown) of the air conditioner ECU 12 and the blower motor device 14 are turned on and supply of power from the power source 16 to the air conditioner ECU 12 and the blower motor device 14 is started. The

  First, in step 100, a predetermined 5V digital voltage value is compared with the voltage of the digital value output from the A / D converter described above. Specifically, it is determined whether or not the difference between the 5V digital voltage value and the voltage of the digital value output from the A / D conversion unit described above is within a predetermined value α.

  Here, “5V digital voltage value” will be described. “5V digital voltage value” means that a signal having a high level of approximately 5V as shown in FIG. 4B is input to the input terminal 27a_i of the CR filter 27a, and a smoothed analog voltage is output from the output terminal 27a_o. The voltage of the digital value when digitized by the A / D conversion unit is experimentally obtained in advance, and indicates the voltage of the digital value obtained experimentally.

  Further, the predetermined value α is, for example, the 5V digital voltage value and the digital value output from the A / D conversion unit when the switch 53 is controlled so that the first voltage is applied to the command signal line 32. It is a value indicating the allowable range of the difference from the voltage, and can be appropriately adjusted. When the difference between the predetermined 5V digital voltage value and the voltage of the digital value output from the A / D converter is within a predetermined value α, the motor 18 and the motor controller 20 are in the normal state. It can be detected that the state of the motor 18 and the motor controller 20 is normal.

  If it is determined in step 100 that the difference between the predetermined 5V digital voltage value and the voltage of the digital value output from the A / D converter is within the predetermined value α, the next step 102 Proceed to

  In step 102, it is detected that the motor 18 and the motor controller 20 are in the normal state, and a determination result indicating the normal state is output to the command signal generation circuit. Then, the state detection process ends.

  On the other hand, if it is determined in step 100 that the difference between the predetermined 5V digital voltage value and the voltage of the digital value output from the A / D converter is larger than the predetermined value α, the next step 104 is performed. Proceed to

  In step 104, a predetermined 2.5V digital voltage value is compared with the digital value voltage output from the A / D converter described above. Specifically, it is determined whether or not the difference between the 2.5V digital voltage value and the voltage of the digital value output from the A / D conversion unit described above is within a predetermined value β.

  Here, “2.5V digital voltage value” will be described. “2.5V digital voltage value” is an analog signal in which a high-level signal of approximately 2.5V as shown in FIG. 5B is input to the input terminal 27a_i of the CR filter 27a and smoothed from the output terminal 27a_o. The voltage of the digital value when the voltage is output and digitized by the A / D conversion unit is experimentally obtained in advance, and indicates the voltage of the digital value obtained experimentally.

  The predetermined value β is output from the A / D conversion unit when the 2.5 V digital voltage value and the switch 53 are controlled so that the second voltage is applied to the command signal line 32, for example. This is a value indicating the allowable range of the difference between the digital value and the voltage, and can be adjusted as appropriate. When the difference between the predetermined 2.5 V digital voltage value and the voltage of the digital value output from the A / D converter is within a predetermined value β, at least one of the motor 18 and the motor controller 20 When the state of the motor 18 and the motor controller 20 is determined to be an abnormal state capable of self-recovery by determining that the state of the motor is the above-described self-recoverable abnormal state (first abnormal state capable of self-recovery) Can be detected.

  If it is determined in step 104 that the difference between the predetermined 2.5 V digital voltage value and the voltage of the digital value output from the A / D converter is within the predetermined value β, Proceed to step 106.

  In step 106, it is detected that at least one of the motor 18 and the motor controller 20 is in an abnormal state capable of self-recovery, and a determination result indicating that the abnormal state is capable of self-recovery is output to the command signal generation circuit. . Then, the state detection process ends.

  If it is determined in step 104 that the difference between the predetermined 2.5 V digital voltage value and the voltage of the digital value output from the A / D converter is greater than the predetermined value β, The detection process ends.

  As described above, according to the air conditioner ECU 12 and the motor controller 20 of the air conditioner 10 of the present embodiment, when the switch 53 as the control means detects the normal state in the protection circuit 55, the first Control is performed so that the second voltage is applied to the command signal line 32 when a voltage is applied to the command signal line 32 and an abnormal state is detected by the protection circuit 55. And the detection part 27 as a detection means of air-conditioner ECU12 detects an abnormal state by detecting the voltage applied to the command signal line 32. FIG.

  Therefore, according to the air conditioner ECU 12 and the motor controller 20 of the air conditioner 10 of the present embodiment, the abnormal state can be detected in more detail on the air conditioner ECU 12 side without cost.

  Further, in the air conditioner ECU 12 and the motor controller 20 of the air conditioner 10 of the present embodiment, the threshold value for obtaining the duty ratio is changed between the normal state and the abnormal state, and the drive of the motor 18 can be controlled more accurately. it can.

  It should be noted that the present invention is not limited to such embodiments, and it will be apparent to those skilled in the art that other various embodiments are possible within the scope of the present invention.

  For example, when the protection circuit 55 detects that the motor 18 and the motor controller 20 are in the normal state, the protection circuit 55 outputs a signal indicating an instruction to connect to the second power supply 59 to the switch 53. When it is detected that at least one state of the motor controller 20 is an abnormal state, a signal indicating an instruction to connect to the first power supply 57 may be output to the switch 53. By operating the protection circuit 55 in this way, the switch 53 detects that an abnormal state is detected by the protection circuit 55 when the normal state is detected by the protection circuit 55 and the second voltage is applied to the command signal line 32. In such a case, control is performed so that the first voltage is applied to the command signal line 32.

  Further, when the protection circuit 55 detects that the motor 18 and the motor controller 20 are in the normal state, the protection circuit 55 outputs a signal indicating an instruction to connect to one of the first power supply and the second power supply 59 to the switch 53. When it is detected that at least one of the motor 18 and the motor controller 20 is in an abnormal state, a signal indicating an instruction to connect to the other of the first power source 57 and the second power source is output to the switch 53. You may make it do. By operating the protection circuit 55 in this way, when the normal state is detected by the protection circuit 55, one of the first voltage and the second voltage is applied to the command signal line 32 and the switch 53 is protected. Control is performed so that the other of the first voltage and the second voltage is applied to the command signal line 32 when an abnormal state is detected by the circuit 55.

  In the present embodiment, the case where the drive command signal S1 is a rectangular wave voltage signal has been described. However, the driving command signal S1 may be a rectangular wave current signal.

[Second Embodiment]
Next, a second embodiment will be described. The description of the same configuration and the same processing as in the first embodiment may be omitted. In this case, the same reference numerals may be given and description thereof may be omitted. Differences between the first embodiment and the second embodiment will be described. As illustrated in FIG. 7, the motor controller 20 according to the second embodiment includes a protection circuit 61, a resistor 63, and a transistor 64. Moreover, the microcomputer of the detection part 27 of this Embodiment performs the state detection process shown in FIG.

  In addition to the function of the protection circuit 55, the protection circuit 61 detects, for example, an abnormal state (so-called latch stop) that is fatal and does not self-recover. Examples of such an abnormal state include an abnormal state in which the motor 18 and the motor controller 20 are excessively damaged when the motor 18 is locked or when the FET of the drive circuit 22 is short-circuited (dead short state). In such an abnormal state, the energization must be cut (cut off) instantaneously to prevent burning. Therefore, in such an abnormal state (second abnormal state), there is no room for self-recovery, and until the abnormal state is canceled (for example, when the motor 18 is locked, the locked state is released). Therefore, it is desired to inform the air conditioner ECU 12 that the energization is not actively performed.

  In the present embodiment, when the protection circuit 61 detects that the state of at least one of the motor 18 and the motor controller 20 is a second abnormal state that is fatal and does not cause self-recovery, the protection circuit 61 causes the base of the transistor 64 to be high. A level signal is output so that the collector terminal and the emitter terminal of the transistor 64 are turned on (conductive). Here, the second abnormal state that is fatal and does not self-recover can be regarded as an abnormal state in which at least one of the motor 18 and the motor controller 20 is stopped.

  As shown in FIG. 7, the collector terminal of the transistor 64 is connected to a connection terminal 90 between the connection terminal 42 and the comparator a via a resistor (for example, a resistor having a resistance value of 100Ω) 63. The emitter terminal of the transistor 64 is grounded. Further, a protection circuit 61 is connected to the base terminal of the transistor 64. As described above, the collector terminal of the transistor 64 of this embodiment is connected to one end of the command signal line 32 via the resistor 63, the resistor 40, and the filter circuit 38. That is, the transistor 64 is provided between the command signal line 32 and a portion (ground) having a reference potential (0 V).

  In addition, a signal from the protection circuit 61 is input to the base terminal of the transistor 64. Therefore, when a low level signal is input to the base terminal of the transistor 64, the collector terminal and the emitter terminal of the transistor 64 are turned off (non-conducting), and the high level signal is applied to the base terminal of the transistor 64. When input, as described above, the collector terminal and the emitter terminal of the transistor 64 are turned on (conductive). The transistor 64 is an example of the second switching means of the present invention.

  When the protection circuit 61 of the present embodiment detects that the state of the motor 18 and the motor controller 20 is normal, the protection circuit 61 outputs a signal indicating an instruction to connect to the first power supply 57 to the switch 53 and the transistor 64. A low level signal is output to the base terminal of the. In addition, the protection circuit 61 is configured such that at least one of the motor 18 and the motor controller 20 is in the first abnormal state (the abnormal state in which at least one of the motor 18 and the motor controller 20 is temporarily restricted is capable of self-recovery. ), A signal indicating an instruction to connect to the second power supply 59 is output to the switch 53, and a low level signal is output to the base terminal of the transistor 64.

  Further, when the protection circuit 61 detects that at least one of the motor 18 and the motor controller 20 is in the second abnormal state (an abnormal state in which at least one of the motor 18 and the motor controller 20 is stopped). In this case, a high level signal is output to the base terminal of the transistor 64. As a result, as shown in FIG. 9, the S1 potential becomes low level. In addition, the protection circuit 61 of this Embodiment comprises a part of control means of this invention.

  Next, the operation of the microcomputer of the detection unit 27 of the present embodiment will be described with reference to the flowchart shown in FIG. FIG. 8 shows a flowchart showing a state detection process executed by the microcomputer of the present embodiment. This state detection process is executed at predetermined time intervals after power switches (not shown) of the air conditioner ECU 12 and the blower motor device 14 are turned on and supply of power from the power source 16 to the air conditioner ECU 12 and the blower motor device 14 is started. The

  First, in step 100, as in the first embodiment, a predetermined 5V digital voltage value is compared with the voltage of the digital value output from the A / D converter described above. Specifically, it is determined whether or not the difference between the 5V digital voltage value and the voltage of the digital value output from the A / D conversion unit described above is within a predetermined value α.

  If it is determined in step 100 that the difference between the predetermined 5V digital voltage value and the voltage of the digital value output from the A / D converter is within the predetermined value α, the next step 102 Proceed to

  In step 102, as in the first embodiment, it is detected that the motor 18 and the motor controller 20 are in the normal state, and a determination result indicating the normal state is output to the command signal generation circuit. Then, the state detection process ends.

  On the other hand, if it is determined in step 100 that the difference between the predetermined 5V digital voltage value and the voltage of the digital value output from the A / D converter is larger than the predetermined value α, the next step 104 is performed. Proceed to

  In step 104, as in the first embodiment, the predetermined 2.5V digital voltage value is compared with the voltage of the digital value output from the A / D converter described above. Specifically, it is determined whether or not the difference between the 2.5V digital voltage value and the voltage of the digital value output from the A / D conversion unit described above is within a predetermined value β.

  If it is determined in step 104 that the difference between the predetermined 2.5 V digital voltage value and the voltage of the digital value output from the A / D converter is within the predetermined value β, Proceed to step 106.

  In step 106, as in the first embodiment, it is detected that at least one of the motor 18 and the motor controller 20 is in a self-recoverable abnormal state and indicates that it is in a self-recoverable abnormal state. The determination result is output to the command signal generation circuit. Then, the state detection process ends.

  If it is determined in step 104 that the difference between the predetermined 2.5 V digital voltage value and the voltage of the digital value output from the A / D converter is greater than the predetermined value β, Proceed to step 200.

  In step 200, the predetermined 0V digital voltage value is compared with the voltage of the digital value output from the A / D converter described above. Specifically, it is determined whether or not the difference between the 0V digital voltage value and the voltage of the digital value output from the A / D conversion unit described above is within a predetermined value γ.

  Here, “0V digital voltage value” will be described. “0V digital voltage value” means that a signal 83 having a high level of approximately 0V as shown in FIG. 9 is input to the input terminal 27a_i of the CR filter 27a, and a smoothed analog voltage is output from the output terminal 27a_o. The voltage of the digital value when digitized by the / D conversion unit is experimentally obtained in advance, and indicates the voltage of the digital value obtained experimentally.

  Further, the predetermined value γ is, for example, the above-described 0V digital voltage value and the digital value voltage output from the A / D conversion unit when control is performed so that a high level signal is input to the base of the transistor 64. It is a value indicating the allowable range of the difference, and can be adjusted as appropriate. When the difference between the predetermined 0V digital voltage value and the voltage of the digital value output from the A / D converter is within a predetermined value γ, at least one state of the motor 18 and the motor controller 20 Can be detected that at least one of the motor 18 and the motor controller 20 is in the second abnormal state by determining that it is an abnormal state in which the above operation is stopped (second abnormal state). .

  If it is determined in step 200 that the difference between the predetermined 0V digital voltage value and the voltage of the digital value output from the A / D converter is within the predetermined value γ, the next step 202 is performed. Proceed to

  In step 202, it is detected that at least one of the motor 18 and the motor controller 20 is in the second abnormal state, and a determination result indicating the second abnormal state is output to the command signal generation circuit. Then, the state detection process ends.

  If it is determined in step 200 that the difference between the predetermined 0V digital voltage value and the voltage of the digital value output from the A / D converter is larger than the predetermined value γ, the state detection process Exit.

  The air conditioner ECU 12 and the motor controller 20 of the present embodiment have been described above. The relationship between the ECU output and the potential of the command signal line 32 in each of the normal state (normal time), the first abnormal state (first abnormal time), and the second abnormal state (second abnormal time) As shown in FIG.

  According to the air conditioner ECU 12 and the motor controller 20 of the present embodiment, when the switch 53 and the protection circuit 61 as the control means detect the normal state by the protection circuit 61 as the detection means, When one of the two voltages is applied to the command signal line 32 and the transistor 64 as the second switching means is turned off, and the first abnormal state is detected by the protection circuit 61, the first voltage and The other of the second voltages is applied to the command signal line 32 and the transistor 64 is controlled to be turned off. When the second abnormal state is detected by the protection circuit 61, the transistor 64 is turned on. The protection circuit 61 controls. The detection unit 27 detects an abnormal state by detecting the voltage applied to the command signal line 32.

  Therefore, according to the air conditioner ECU 12 and the motor controller 20 of the present embodiment, the abnormal state can be detected in more detail on the air conditioner ECU 12 (control device) side without cost.

  Further, in the air conditioner ECU 12 and the motor controller 20 of the air conditioner 10 of the present embodiment, the threshold value for obtaining the duty ratio is changed between the normal state and the first abnormal state, and the drive of the motor 18 is controlled more accurately. can do.

  Further, according to the air conditioner ECU 12 and the motor controller 20 of the present embodiment, in the second abnormal state, the supply of power to the motor 18 is interrupted.

  In the present embodiment, the case where the drive command signal S1 is a rectangular wave voltage signal has been described, but it may be a rectangular wave current signal.

  Similarly to the first embodiment, when the protection circuit 61 detects that the motor 18 and the motor controller 20 are in a normal state, the protection circuit 61 switches a signal indicating an instruction to connect to the second power supply 59. When a low level signal is output to the base terminal of the transistor 64 and at least one of the motor 18 and the motor controller 20 is detected as the first abnormal state, A signal indicating an instruction to connect to the power source 57 may be output to the switch 53 and a low level signal may be output to the base terminal of the transistor 64.

DESCRIPTION OF SYMBOLS 10 ... Air conditioner, 12 ... Air-conditioner ECU, 14 ... Blower motor apparatus, 16 ... Power supply, 18 ... Motor, 20 ... Motor controller, 22 ... Drive circuit, 24 ... Rotation control circuit, 26 ... Output part, 27 ... Detection part, 28 ... Transistor, 30 ... Resistor, 32 ... Command signal line, 34 ... Resistor, 36 ... Capacitor, 38 ... Filter circuit, 40 ... Resistor, 42 ... Connection terminal, 44 ... Pull-up resistor, 43 ... OP amplifier, 47 ... Resistor, 49 ... resistor 51 ... connecting terminal 53 ... switch 55 ... protection circuit 57 ... first power source 59 ... second power source

Claims (9)

A voltage source for applying the first voltage and the second voltage to the command signal line;
A detecting means for detecting an abnormal state by detecting a voltage applied to the command signal line; and a switching means provided between the command signal line and a portion having a reference potential. Control means for on / off controlling the switching means according to a duty ratio corresponding to a target rotational speed of the motor based on the voltage value detected by the detection means in a state where a voltage is applied from the voltage source. A control device;
Driving means for driving the motor based on a drive command signal generated according to a voltage state of the command signal line in a state in which the switching means is on-off controlled;
Detecting means for detecting whether the motor and the driving means are in a normal state, or whether at least one of the motor and the driving means is in an abnormal state;
When a normal state is detected by the detection means, one of the first voltage and the second voltage is applied to the command signal line, and when an abnormal state is detected by the detection means, the first voltage Control means for controlling the other of the voltage of 1 and the second voltage to be applied to the command signal line;
Including a motor control device. A voltage source for applying the first voltage and the second voltage to the command signal line;
Detecting means for detecting an abnormal state by detecting a voltage applied to the command signal line, and first switching means provided between the command signal line and a portion having a first reference potential. The first switching means according to a duty ratio corresponding to a target rotational speed of the motor based on a voltage value detected by the detection means in a state where a voltage is applied to the command signal line from the voltage source. A control device comprising control means for controlling on / off of the device;
Drive means for driving the motor based on a drive command signal generated according to a voltage state of the command signal line in a state where the first switching means is on-off controlled;
The motor and the drive means are in a normal state, or at least one of the motor and the drive means is in a first abnormal state in which operation is temporarily restricted, or at least one of the motor and the drive means. Detecting means for detecting whether one of the second abnormal states in which the operation is stopped;
A second switching means provided between the command signal line and a portion having a second reference potential;
When a normal state is detected by the detection means, one of the first voltage and the second voltage is applied to the command signal line and the second switching means is turned off, and the detection means When the first abnormal state is detected by the control, the other of the first voltage and the second voltage is applied to the command signal line and the second switching means is turned off. And a control means for controlling the second switching means to be turned on when the second abnormal state is detected by the detection means;
Including a motor control device.   When the normal state is detected by the detection unit, the drive unit outputs a control signal obtained by comparing the drive command signal with a first threshold value for obtaining a duty ratio in the normal state. Based on this, the driving of the motor is controlled, and when the abnormal state is detected by the detecting means, the drive command signal is compared with a second threshold value for obtaining a duty ratio in the abnormal state. The motor control device according to claim 1, wherein the driving of the motor is controlled based on a control signal obtained by the above.   When the normal state is detected by the detection unit, the drive unit outputs a control signal obtained by comparing the drive command signal with a first threshold value for obtaining a duty ratio in the normal state. A second control unit for controlling the driving of the motor based on the driving command signal and a duty ratio in the case of the first abnormal state when the detection unit detects the first abnormal state. The motor control device according to claim 2, wherein the driving of the motor is controlled based on a control signal obtained by comparing the threshold value of the motor.   The motor control device according to claim 1, wherein the reference potential is set to 0V.   The motor control device according to claim 3 or 4, wherein the first reference potential and the second reference potential are set to 0V. Detection means for detecting a state by detecting a voltage applied to the command signal line by a voltage source for applying the first voltage and the second voltage to the command signal line, and the command signal line and the reference potential A switching means provided between the provided part and a target rotational speed of the motor based on a voltage value detected by the detection means in a state where a voltage is applied to the command signal line from the voltage source A drive command signal generated according to the voltage state of the command signal line in a state where the switching unit of the control device including the control unit that controls on / off of the switching unit according to the duty ratio according to And a drive means for driving the motor and whether the motor is in a normal state or whether at least one of the drive means and the motor is in an abnormal state.
When a normal state is detected, one of the first voltage and the second voltage is applied to the command signal line, and when an abnormal state is detected, the first voltage and the second voltage are detected. A state detection method for controlling the other of the voltages to be applied to the command signal line. Detection means for detecting a state by detecting a voltage applied to the command signal line by a voltage source for applying the first voltage and the second voltage to the command signal line, the command signal line and the first signal line Based on a voltage value detected by the detection means in a state in which a first switching means is provided between the reference potential and a portion having a reference potential, and a voltage is applied to the command signal line from the voltage source. In the state where the first switching means of the control device including the control means for controlling the on / off of the first switching means according to the duty ratio according to the target rotational speed of the motor is ON / OFF controlled, the command signal Drive means for driving the motor based on a drive command signal generated according to the voltage state of the line, and whether the motor is in a normal state, at least of the drive means and the motor It is either the first abnormal state capable self-restoration operation is temporarily limited or at least one of the driving means and the motor detects whether second abnormal state operation is stopped,
When a normal state is detected, one of the first voltage and the second voltage is applied to the command signal line, and between the command signal line and a portion having a second reference potential When the second switching means provided in the switch is turned off and the first abnormal state is detected, the other of the first voltage and the second voltage is applied to the command signal line. A state detection method for controlling the second switching means to be turned off, and for controlling the second switching means to be turned on when the second abnormal state is detected. In a device control device that transmits a drive command signal from a first control device to a second control device via a command signal line, and that controls driving of a control target device based on the drive command signal transmitted by the second control device. ,
The second control device is configured to detect whether the second control device is in a normal state or an abnormal state, and when a normal state is detected by the state detection unit, the first voltage and When one of the first voltage and the second voltage of a voltage source for applying a second voltage is applied to the command signal line and an abnormal state is detected by the state detection means, the first voltage Control means for controlling the other of the voltage of 1 and the second voltage to be applied to the command signal line;
The device control apparatus according to claim 1, wherein the first control apparatus includes a detection unit that detects an abnormal state by detecting a voltage applied to the command signal line.

Images