JP2015104282A - Motor control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To explicitly change the operating mode of communication means after powering on by a simple configuration.SOLUTION: A LIN transceiver 52 that is communication means performs communication between an A/C ECU 82 and a control circuit 32 controlling the rotational speed of a blower motor 16 on the basis of a command transmitted from the A/C ECU 82. A bipolar transistor 70 outputs a pulse signal for changing the operating mode of the LIN transceiver 52 to an NSLP terminal 522 of the LIN transceiver 52 when each of the control circuit 32 and the LIN transceiver 52 is powered on, and then the LIN transceiver 52 changes the operating mode and outputs a signal indicating the operating mode after the change to the control circuit 32.

Description

  The present invention relates to a motor control device.

  In a vehicle-mounted device such as a vehicle air conditioner, the control circuit of the device is based on a command from a host ECU (Electronic Control Unit) such as an air conditioner ECU (hereinafter referred to as “A / C ECU”). To control the operation. For example, when a command to further increase the ventilation of the air conditioner is input from the A / C ECU to the control circuit of the vehicle air conditioner, the control circuit controls the blowing of the air conditioner based on the command input from the A / C ECU. Control to increase the rotation speed of the blower motor.

  In many cases, communication between a control circuit of an in-vehicle device such as an air conditioner for a vehicle and an ECU that is higher than the control circuit such as an A / C ECU has a protocol as LIN (Local Interconnect Network) ) Is used. A control circuit of an in-vehicle device such as a vehicle air conditioner has an LIN transceiver that is an integrated circuit that converts information transmitted from a host ECU according to the LIN protocol into a format that can be interpreted by the control circuit of the in-vehicle device. Is provided. The LIN transceiver has a function of transmitting information such as the rotational speed of the blower motor from the control circuit of the in-vehicle device to the host ECU according to the LIN protocol.

  The LIN transceiver has a plurality of operation modes such as a normal mode, a standby mode, and a sleep mode related to communication between the host ECU and the control circuit of the device. Further, as an example, the LIN transceiver outputs a low level signal from the INH terminal when the LIN transceiver shifts to a sleep mode that is a sleep state. However, the LIN transceiver outputs a high level signal from the INH terminal in modes other than the sleep mode.

  In order for the LIN transceiver to operate in the desired mode of operation, it is necessary to know what mode of operation the LIN transceiver is currently in. Therefore, after the power is turned on, for example, the operation mode of the LIN transceiver is once shifted to the sleep mode where the operation mode can be clearly grasped by the low level signal output from the INH terminal, and then the desired operation mode is entered. It is preferable to migrate.

  Patent Document 1 discloses an invention of an electronic device that receives a signal according to a LIN protocol from a host ECU by a control IC, and the control IC converts the received signal into an input voltage level of a microcomputer to control a motor. Has been.

JP 2006-158152 A

  However, the electronic device described in Patent Document 1 has a problem that it does not consider the change of the operation mode after the control IC corresponding to the LIN transceiver is turned on.

  The present invention has been made in view of the above, and an object of the present invention is to provide a motor control device that can explicitly change the operation mode of a communication means such as a LIN transceiver after power is turned on with a simple configuration. To do.

  In order to solve the above-mentioned problem, the motor control device according to claim 1 includes: a control unit that controls the rotation speed of the motor based on a command transmitted by the host control unit; and the host control unit and the control unit. Provided with a plurality of operation modes related to communication between the higher-level control means and the control means, and an input section to which a signal for changing the operation mode is input, and input to the input section A communication unit that changes the operation mode in accordance with the received signal and outputs a signal indicating the predetermined operation mode to the control unit when the changed operation mode is a predetermined operation mode; An input means for inputting a predetermined signal for changing the predetermined operation mode of the communication means to the input section of the communication means when the power of each of the control means and the communication means is turned on; The has.

  The motor control device includes an input unit that inputs a predetermined signal for changing the operation mode of the communication unit to the input unit of the communication unit when the control unit and the communication unit are turned on.

  When a predetermined signal is input to the input unit, the communication unit changes to a predetermined operation mode and outputs a signal indicating the changed operation mode, so that the power is turned on with a simple configuration. The operation mode of the communication means such as a later LIN transceiver can be explicitly changed.

  The motor control device according to claim 2 is the motor control device according to claim 1, wherein the input means includes an emitter as a power source for the control means and the communication means, and a resistance indicating a predetermined resistance value for the power source. A transistor having a base connected via an element and a collector connected to the input section of the communication means; the transistor is configured to have the predetermined power when the power of each of the control means and the communication means is turned on. Is input from the collector to the input unit of the communication means.

  According to this motor control device, the operation mode of the communication means such as the LIN transceiver after the power is turned on can be changed by an input means having a simple configuration including a transistor and a resistance element.

  A motor control device according to a third aspect is the motor control device according to the first or second aspect, wherein the communication unit sets an operation mode when the predetermined signal is input to the input unit from the input unit. Change to hibernation.

  According to this motor control device, after the power is turned on, the operation mode of the communication means can be changed to a sleep mode that is a sleep state.

It is a figure which shows the outline of the motor control apparatus which concerns on embodiment of this invention. It is the schematic which shows each voltage change of the gate line of reverse connection prevention FET and the emitter line of a bipolar transistor from immediately after power-on of the motor control apparatus which concerns on embodiment of this invention. It is the schematic which showed an example of the change of the voltage of the emitter voltage of the motor control apparatus which concerns on embodiment of this invention, the gate line voltage, the voltage of the collector of a bipolar transistor, and the INH terminal of a LIN transceiver. It is the schematic which shows an example of the state transition after the power-on of the LIN transceiver in the motor control apparatus which concerns on embodiment of this invention.

  FIG. 1 is a diagram showing an outline of a motor control device 10 according to the present embodiment. 1 includes a drive circuit 42 that generates a voltage to be applied to the coil of the blower motor 16, a control circuit 32 that controls the drive circuit 42 based on a command from the A / C ECU 82, and a LIN transceiver. 52. When the blower motor 16 is a DC brushless motor, the drive circuit 42 is a circuit that generates a voltage to be applied to a coil of a stator (not shown) of the blower motor 16 by so-called PWM (Pulse Width Modulation) control.

  In many cases, the drive circuit 42 is configured by an inverter circuit using an FET (Field Effect Transistor). The drive circuit 42 is supplied with power from the battery 80 via the switch 20 and the power connector 66, and a noise removing coil 44 is provided between the drive circuit 42 and the power connector 66.

  The control circuit 32 is a microcomputer that performs control to switch the FET constituting the drive circuit 42 based on a command from the A / C ECU 82 and to cause the drive circuit 42 to generate a voltage to be applied to the stator coil of the blower motor 16. It is. The LIN transceiver 52 is provided between the control circuit 32 and the A / C ECU 82, and serves as communication means for establishing communication between the control circuit 32 and the A / C ECU 82 with a predetermined protocol, for example, the LIN protocol. It is a functioning integrated circuit. The control circuit 32 and the LIN transceiver 52 are supplied with power from the battery 80 via the switch 20, the power connector 66 and the diode 96.

  The LIN transceiver 52 includes an RXD terminal 521 that outputs information received from the A / C ECU 82 to the control circuit 32, and an NSLP terminal 522 that receives a predetermined signal and places the LIN transceiver 52 in the sleep mode. The LIN transceiver 52 includes an NWAKE terminal 523 that receives a predetermined signal and places the LIN transceiver 52 in a standby mode that is in a standby state, and a TXD terminal 524 that outputs a low-level signal when the standby mode is entered. The LIN transceiver 52 includes a GND terminal 525 that is a ground terminal, and a LIN terminal 526 that communicates with the A / C ECU 82 using the LIN protocol. Furthermore, the LIN transceiver 52 includes a BAT terminal 527 to which power is supplied from the battery 80, and an INH terminal 528 that outputs a low level signal when the sleep mode is entered.

  In this embodiment, the predetermined signal for setting the LIN transceiver 52 to the sleep mode is a high-level signal that is input immediately after the power of the LIN transceiver 52 is turned on, and a low-level signal that is input next. It consists of and. That is, in this embodiment, when a high-level pulse signal is input to the NSLP terminal 522 immediately after the power of the LIN transceiver 52 is turned on, the operation mode of the LIN transceiver 52 changes to the sleep mode. .

  The LIN terminal 526 of the LIN transceiver 52 is connected to the A / C ECU 82 via the LIN connector 64. Between the LIN terminal 526 and the LI connector 64, a bidirectional Zener diode 60 and a capacitor 62 for circuit protection are connected. Are connected to each other. The other ends of the bidirectional Zener diode 60 and the capacitor 62 are grounded through the GND connector 68 together with the GND terminal 525 of the LIN transceiver 52. The drive circuit 42 and the control circuit 32 are also grounded via the GND connector 68.

  Between each of the GND terminals 525 of the drive circuit 42, the control circuit 32, and the LIN transceiver 52 and the GND connector 68, a reverse connection prevention FET 46, which is an FET for protecting the circuit when the battery 80 is reversely connected, is provided. It has been. The reverse connection prevention FET 46 is an N-type MOSFET (Metal Oxide Semiconductor Field Effect Transistor) as an example, and functions as a kind of constant current diode.

  The motor control apparatus 10 according to the present embodiment is provided with a PNP-type bipolar transistor 70. The emitter (E) of the bipolar transistor 70 is connected to a battery 80 which is a power source for the control circuit 32 and the LIN transceiver 52 via a power connector 66. The base (B) of the bipolar transistor 70 is connected to the battery 80 through the resistor 74 together with the gate of the reverse connection prevention FET 46. The collector (C) of the bipolar transistor 70 is grounded via the resistor 72 and is connected to the NSLP terminal 522 of the LIN transceiver 52.

  FIG. 2 is a schematic diagram showing voltage changes in the gate line 78 of the reverse connection prevention FET 46 and the emitter line 76 of the bipolar transistor 70 immediately after the motor control device 10 according to the present embodiment is turned on. When the power of the motor control device 10 is turned on by the switch 20 and the control circuit 32 and the LIN transceiver 52 are turned on, a voltage of about 12 V is applied to the gate line 78 and the emitter line 76 from the battery 80, respectively. However, in FIG. 2, the emitter line voltage 90 that is the voltage of the emitter line 76 reaches 12 V earlier than the gate line voltage 92 that is the voltage of the gate line 78.

  A diode 96 for preventing a backflow is provided between the emitter of the bipolar transistor 70 and the power connector 66. However, since an element such as a resistor is not provided, immediately after the power source of the motor control device 10 is turned on. The voltage rises quickly. However, a resistor 74 is provided between the gate of the reverse connection prevention FET 46 and the power supply connector 66, and a ceramic capacitor 84 is provided between the gate and the same source of the reverse connection prevention FET 46 for protecting the gate of the reverse connection prevention FET 46. ing. Due to the influence of the resistor 74 and the like, the voltage rise of the gate line 78 immediately after the power supply of the motor control device 10 is turned on is delayed compared to the emitter line 76. As a result, a potential difference 94 of about 9 V at maximum is generated between the emitter line voltage 90 and the gate line voltage 92. The resistor 74 has a predetermined resistance value such as 100 kΩ, for example. The predetermined resistance value is determined through simulation and trial manufacture using a computer according to the circuit of the motor control device 10.

  FIG. 3 shows an example of changes in the emitter line voltage 90 and the gate line voltage 92, the collector voltage 104 of the bipolar transistor 70, and the voltage at the INH terminal 528 of the LIN transceiver 52 in the motor control apparatus 10 according to the present embodiment. FIG.

  In the lower part of FIG. 3, the operation mode 102 of the LIN transceiver 52 is described. The operation mode 102 of the LIN transceiver 52 is, for example, the Power ON mode when the motor control device 10 is turned on. However, immediately after the pulsed collector voltage 104 is input from the collector of the bipolar transistor 70 to the NSLP terminal 522 of the LIN transceiver 52, the operation mode of the LIN transceiver 52 becomes a normal mode which is a normal operation state. Furthermore, after the application of the pulsed collector voltage 104 is completed, the operation mode of the LIN transceiver 52 is the sleep mode.

  In FIG. 3, when the power source of the motor control device 10 is turned on, the emitter line voltage 90 rises earlier than the gate line voltage 92 and a potential difference is generated between the two. As a result, a potential difference is generated between the emitter and the base in the bipolar transistor 70, the bipolar transistor 70 is turned on by the potential difference, and the collector voltage 104, which is the collector voltage of the bipolar transistor 70, rises. However, as shown in FIG. 2, the delay of the rise of the gate line voltage 92 with respect to the emitter line voltage 90 is, for example, 50 msec or less. Therefore, the potential difference between the emitter and the base of the bipolar transistor 70 is a short time, for example, 50 msec or less. Eliminate. As a result, the bipolar transistor 70 is turned on only in a short time, and the collector voltage 104 is output as a high level pulse signal.

  In FIG. 1, since the collector of the bipolar transistor 70 is connected to the NSLP terminal 522 of the LIN transceiver 52, the high level collector voltage 104 is input to the NSLP terminal 522. The LIN transceiver 52 recognizes the high-level collector voltage 104 as a signal for setting the operation mode to the normal mode. As a result, the LIN transceiver 52 changes its own operation mode to the normal mode, and outputs a high level signal 98 indicating that the INH terminal 528 has shifted to the normal mode to the control circuit 32.

  However, the high-level collector voltage 104 is in a pulse form, and the voltage immediately drops. This voltage drop causes the NSLP terminal 522 to be the same as the low-level collector voltage 104 being input. The LIN transceiver 52 recognizes such a change in the voltage of the collector voltage 104 as a signal for setting the operation mode to the sleep mode. As a result, the LIN transceiver 52 changes its own operation mode to the sleep mode and outputs a low level signal 100 indicating that the INH terminal 528 has shifted to the sleep mode to the control circuit 32.

  The control circuit 32 receives the low-level signal 100 from the LIN transceiver 52 to recognize that the LIN transceiver 52 is in the sleep mode, and thereafter sets the LIN transceiver 52 to a desired operation mode from the sleep mode. Control such as changing.

  FIG. 4 is a schematic diagram illustrating an example of a state transition after the LIN transceiver 52 is turned on in the motor control device 10 according to the present embodiment. When the switch 20 is turned on and the voltage of the battery 80 is applied, the operation mode of the LIN transceiver 52 is set to the PowerON mode in step 400. When a high level signal is applied to the NSLP terminal 522 in the power ON mode, the LIN transceiver 52 changes the operation mode to the normal mode and outputs a high level signal from the INH terminal 528 in step 402.

  When a low level signal is applied to the NSLP terminal 522 in the normal mode, the LIN transceiver 52 changes the operation mode to the sleep mode and outputs a low level signal from the INH terminal 528 in step 404. When the LIN signal is received from the A / C ECU 82 or the like in the sleep mode, in step 406, the LIN transceiver 52 changes the operation mode to the standby mode.

  When a high level signal is applied to the NSLP terminal 522 in the standby mode, the LIN transceiver 52 changes the operation mode to the normal mode and outputs a high level signal from the INH terminal 528 in step 408.

  Further, when the low level signal is applied to the NSLP terminal 522 in the normal mode, the LIN transceiver 52 changes the operation mode to the sleep mode and the low level signal from the INH terminal 528 as shown in step 404. Is output.

  As described above, in the present embodiment, the bipolar transistor 70 has the emitter connected to the power supply of the control circuit 32 and the LIN transceiver 52, the base connected to the power supply through the resistor, and the collector connected to the NSLP terminal 522 of the LIN transceiver 52. It has. After the power supply of the motor control device 10 is turned on, the bipolar transistor 70 outputs a pulsed collector voltage 104 to the NSLP terminal 522 of the LIN transceiver 52. When the pulsed collector voltage 104 is input to the NSLP terminal 522, the LIN transceiver 52 changes the operation mode to the sleep mode and outputs a signal indicating that the operation mode is the sleep mode from the INH terminal 528.

  As described above, according to the present embodiment, the operation mode of the LIN transceiver after the power is turned on can be explicitly changed to the sleep mode with a simple configuration.

  In this embodiment, when a predetermined signal is input, the LIN transceiver 52 changes to the sleep mode and outputs a signal indicating that the mode has been changed to the sleep mode. However, as long as the change of the operation mode is clearly indicated by the output of a predetermined signal or the like, the operation mode may be changed to a mode other than the sleep mode after the power is turned on. For example, if a communication means such as the LIN transceiver 52 outputs a predetermined signal when the standby mode is changed, a signal for changing the communication means to the standby mode is input to the communication means after the power is turned on. To do.

DESCRIPTION OF SYMBOLS 10 ... Motor control device, 16 ... Blower motor, 20 ... Switch, 32 ... Control circuit, 42 ... Drive circuit, 44 ... Coil, 52 ... LIN transceiver, 60 ... Bidirectional Zener diode 62 ... Capacitor 64 ... LIN connector 66 ... Power supply connector 68 ... GND connector 70 ... Bipolar transistor 72, 74 ... Resistor 76 ..Emitter line, 78 ... Gate line, 80 ... Battery, 82 ... A / C ECU, 84 ... Ceramic capacitor, 90 ... Emitter line voltage, 92 ... Gate line voltage, 94 ... potential difference, 96 ... diode, 98 ... high level signal, 100 ... low level signal, 102 ... operation mode, 104 ... co 521 ... RXD terminal, 522 ... NSLP terminal, 523 ... NWAKE terminal, 524 ... TXD terminal, 525 ... GND terminal, 526 ... LIN terminal, 527 ... BAT Terminal, 528 ... INH terminal

Claims (3)

Control means for controlling the rotational speed of the motor based on the command transmitted by the host control means;
Provided between the upper control means and the control means, a plurality of operation modes relating to communication between the upper control means and the control means, and an input for inputting a signal for changing the operation mode And changing the operation mode according to a signal input to the input unit, and when the changed operation mode is a predetermined operation mode, a signal indicating the predetermined operation mode is Communication means for outputting to the control means;
An input means for inputting a predetermined signal for changing the predetermined operation mode of the communication means to the input section of the communication means when the power of each of the control means and the communication means is turned on; ,
A motor control device.   The input means is a transistor in which an emitter is connected to the power supply of the control means and the communication means, a base is connected to the power supply through a resistance element having a predetermined resistance value, and a collector is connected to the input section of the communication means. 2. The transistor according to claim 1, wherein the transistor inputs the predetermined signal from the collector to the input unit of the communication unit when the power of each of the control unit and the communication unit is turned on. Motor control device.   The motor control device according to claim 1, wherein the communication unit changes an operation mode to a dormant state when the predetermined signal is input to the input unit from the input unit.

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