JP7056341B2 - Motor controller and motor - Google Patents

Description

The present invention relates to a motor control device and a motor.

Conventionally, in a vehicle motor control device, the estimated temperature of the motor is calculated based on the drive information of the motor (applied voltage, rotation speed, etc.), and the energization of the motor is controlled based on the estimated temperature. A control device for preventing burnout is disclosed (see, for example, Patent Document 1). According to this control device, it is possible to prevent the motor from burning while reducing the size of the motor by omitting the burning protection element such as bimetal or PTC.

Japanese Unexamined Patent Publication No. 2007-53894

Since many electrical components are mounted on vehicles in recent years, it is desirable to stop energization from the vehicle battery to the motor and motor control device of the electrical components when the ignition is turned off, in consideration of the load on the vehicle battery. However, in the motor control device having the burnout prevention function as described above, when the energization from the vehicle battery is stopped due to the ignition off, the calculation process of the estimated temperature of the motor cannot be executed during the energization stop period. For this reason, there is a possibility that there will be a discrepancy between the estimated motor temperature calculated after the ignition is turned on (after resuming energization of the motor control device) and the actual motor temperature (actual temperature), resulting in burning. It becomes difficult to properly execute the preventive function.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor control device and a motor capable of suppressing a deviation between an actual temperature of a motor and an estimated temperature.

The motor control device that solves the above problems controls the motor mounted on the vehicle, and is a motor control device in which the energization from the vehicle battery is stopped when the ignition is turned off, and the drive information of the motor is used. A control IC that performs an estimated temperature calculation process that calculates the estimated temperature of the motor based on the above, and performs a burnout prevention control that stops the energization of the motor based on the estimated temperature calculated by the estimated temperature calculation process, and an ignition on. A charge / discharge circuit including a capacitor, which charges the electric power from the vehicle battery at the time of charging and discharges the charged electric power to the control IC at the time of ignition off, is provided , and the control IC is ignited off. The execution frequency of the estimated temperature calculation process is set so that the supply voltage to the control IC can be maintained at or above the voltage required for the operation of the control IC for a predetermined period from the time point .

According to the above aspect, when the power supply to the motor control device is stopped due to the ignition off, power is supplied from the charge / discharge circuit to the control IC. As a result, the estimated temperature of the motor can be calculated by the control IC even when the ignition is off, so that the deviation between the actual temperature of the motor and the estimated temperature can be suppressed, and as a result, the control IC can be appropriately controlled to prevent burning. It becomes possible to execute.
In the motor control device, the predetermined period differs depending on the temperature of the motor at the time of ignition off, and becomes longer as the temperature of the motor at the time of ignition off becomes higher.

In the motor control device, the control IC reduces the execution frequency of the estimated temperature calculation process according to the passage of time after the ignition is turned off.
According to the above aspect, when the temperature of the motor is higher than the ambient temperature, the amount of temperature decrease of the motor after the ignition is turned off is large immediately after the ignition is turned off, and gradually becomes gentle with the passage of time. For this reason, by allocating more power to the charge / discharge circuit to the estimated temperature calculation process for a while after the ignition is turned off, where the temperature change of the motor is large, the capacity of the capacitor in the charge / discharge circuit can be reduced to reduce the size and cost. It is possible to calculate the estimated temperature of the motor with high accuracy while trying to achieve the above.

In the motor control device, the control IC sets the execution frequency of the estimated temperature calculation process based on the estimated temperature of the motor at the time when the ignition is switched off.
According to the above aspect, it is possible to execute an appropriate estimated temperature calculation process according to the temperature of the motor at the time when the ignition is switched off, and as a result, it is possible to more preferably suppress the deviation between the actual temperature of the motor and the estimated temperature. ..

A motor that solves the above problems integrally includes the above motor control device.
According to the above aspect, it is possible to provide a motor integrated with a control device capable of suppressing a deviation between the actual temperature of the motor and the estimated temperature.

According to the motor control device and the motor of the present invention, it is possible to suppress the deviation between the actual temperature of the motor and the estimated temperature.

The schematic block diagram of the system including the motor control device in embodiment. (A) (b) Explanatory drawing for explaining the processing of the control IC.

Hereinafter, an embodiment of the motor control device and the motor will be described.
The motor 10 shown in FIG. 1 is a power window motor installed in the vehicle door D for automatically opening and closing the window glass WG of the vehicle door D. A motor control device 11 (power window ECU) for controlling the motor 10 is integrally provided with the motor 10.

The control IC 12 (microcomputer) included in the motor control device 11 is based on the operation of an open / close switch (not shown) provided on the vehicle door D, via a drive circuit 13 including a relay that receives power supplied from the vehicle battery BT. It controls the rotational drive of the motor 10. Then, the rotational drive of the motor 10 is transmitted to the window glass WG via a wind regulator (not shown), whereby the window glass WG is opened and closed in the vertical direction.

The control IC 12 acquires various necessary vehicle information from a body ECU (upper ECU) (not shown). Examples of the vehicle information acquired by the control IC 12 from the body ECU include an on / off signal of a well-known ignition switch IG provided in the vehicle.

The control IC 12 performs an estimated temperature calculation process for calculating an estimated temperature of the motor 10 based on motor drive information such as an applied voltage applied to the motor 10 and a rotation speed of the motor 10. This makes it possible to calculate the estimated temperature of the motor 10 by the arithmetic processing of the control IC 12 without using a special element for detecting the temperature of the motor 10. In the estimation temperature calculation process of the control IC 12, when the motor 10 is energized, a temperature counter is added based on the drive information (applied voltage, rotation speed, etc.) of the motor 10. On the other hand, when the motor 10 is not energized, the temperature counter is subtracted.

Further, the control IC 12 stops energization of the motor 10 when the estimated temperature of the motor 10 calculated by the above estimated temperature calculation process reaches a preset threshold value. This prevents the motor 10 from burning.

The motor control device 11 includes a charge / discharge circuit 14 connected in parallel to the control IC 12. The charge / discharge circuit 14 includes a capacitor 15 directly connected to each other and a resistance element 16.

When the ignition switch IG is on, the electric power of the vehicle battery BT is supplied to the motor 10, the control IC 12, and the charge / discharge circuit 14 (see the solid line arrow in FIG. 1).
On the other hand, when the ignition switch IG is off, the energization of the motor 10, the control IC 12, and the charge / discharge circuit 14 from the vehicle battery BT is stopped. At this time, the capacitor 15 of the charge / discharge circuit 14 discharges the electric power charged when the ignition switch IG is on to the control IC 12 (see the broken line arrow in FIG. 1).

As shown in FIG. 2A, the control IC 12 performs an estimated temperature calculation process by feeding power from the capacitor 15 after the energization is stopped by turning off the ignition switch IG. In FIG. 2A, the actual temperature of the motor 10 is shown by a broken line graph, and the estimated temperature (calculated value) of the motor 10 calculated by the estimated temperature calculation process is shown by a black dot.

The amount of decrease in the actual temperature of the motor 10 after the ignition is turned off is large immediately after the ignition is turned off, and gradually becomes gentle with the passage of time. Further, the voltage (supply voltage V) supplied from the charge / discharge circuit 14 to the control IC 12 decreases due to the power consumption associated with the execution of the estimated temperature calculation process of the control IC 12 (see FIG. 2B). Therefore, the control IC 12 sets the supply voltage V to be equal to or higher than the operating voltage Vx (voltage required for the operation of the control IC 12) of the control IC 12 in the period until the temperature change of the motor 10 becomes gentle (the period until the temperature approaches the atmosphere temperature). Set the execution frequency of the estimated temperature calculation process (the number of executions of the estimated temperature calculation process per unit time) so that it can be kept at.

The period from the time when the ignition switch IG is turned off until the temperature change of the motor 10 becomes gentle can be roughly grasped in advance by an experiment or the like. Further, the period differs depending on the temperature of the motor 10 when the ignition switch IG is switched off (the higher the temperature of the motor 10 when the ignition switch IG is switched off, the longer the period). .. Therefore, the control IC 12 sets the execution frequency of the estimated temperature calculation process (the number of executions of the estimated temperature calculation process per unit time) based on the estimated temperature of the motor 10 when the ignition switch IG is switched off. That is, the control IC 12 sets the execution frequency of the estimated temperature calculation process to be lower as the estimated temperature of the motor 10 at the time when the ignition switch IG is switched off is higher. This makes it possible to keep the supply voltage V equal to or higher than the operating voltage Vx of the control IC 12 until the temperature change of the motor 10 becomes gentle.

Further, as shown in FIG. 2A, in the executable section of the estimated temperature calculation process of the control IC 12, the first section A1 and the second section A2 having different execution frequencies of the estimated temperature calculation process are set. .. The first section A1 is a section starting from the time when the ignition switch IG is switched off, and the second section A2 is set after the first section A1. The execution frequency of the estimated temperature calculation process of the control IC 12 is set to be higher in the first section A1 than in the second section A2.

The operation of this embodiment will be described.
When the ignition switch IG is on, the control IC 12 operates by supplying power from the vehicle battery BT and executes an estimated temperature calculation process for calculating the estimated temperature of the motor 10. On the other hand, after the energization from the vehicle battery BT is stopped by turning off the ignition switch IG, the control IC 12 executes the estimated temperature calculation process by supplying power from the charge / discharge circuit 14 (capacitor 15). As a result, the dissociation between the actual temperature of the motor 10 and the estimated temperature can be kept small after the energization from the vehicle battery BT is stopped.

Further, in the present embodiment, the first section A1 having a high execution frequency of the estimated temperature calculation process is set immediately after the ignition switch IG is switched off, and the estimated temperature calculation process is executed after the first section A1. A second section A2 having a frequency lower than that of the first section A1 is set. The amount of temperature decrease of the motor 10 after the ignition is turned off is large immediately after the ignition is turned off, and gradually becomes gentle with the passage of time. Therefore, more power of the charge / discharge circuit 14 can be allocated to the estimated temperature calculation process in a certain period (first section A1) after the ignition is turned off when the temperature change of the motor 10 is large. As a result, it is possible to accurately calculate the estimated temperature of the motor 10 while reducing the capacity of the capacitor of the charge / discharge circuit 14 to reduce the size and cost.

The effect of this embodiment will be described.
(1) The control IC 12 performs an estimated temperature calculation process for calculating the estimated temperature of the motor 10 based on the drive information of the motor 10, and energizes the motor 10 based on the estimated temperature calculated by the estimated temperature calculation process. Performs burnout prevention control to stop. Then, the charge / discharge circuit 14 charges the electric power from the vehicle battery when the ignition switch IG is on, and discharges the charged electric power to the control IC 12 when the ignition switch IG is off. According to this aspect, power is supplied from the charge / discharge circuit 14 to the control IC 12 in a state where the energization from the vehicle battery BT is stopped due to the ignition off. As a result, the calculation process of the estimated temperature of the motor 10 by the control IC 12 can be executed even in the ignition off state, so that the deviation between the actual temperature of the motor 10 and the estimated temperature can be suppressed, and as a result, the burnout prevention control of the control IC 12 can be performed. It will be possible to execute it properly.

(2) The control IC 12 reduces the execution frequency of the estimated temperature calculation process according to the passage of time after the ignition is turned off. According to this aspect, when the temperature of the motor 10 is higher than the ambient temperature, the amount of temperature decrease of the motor 10 after the ignition is turned off is large immediately after the ignition is turned off, and gradually becomes gentle with the passage of time. Therefore, by allocating more power of the charge / discharge circuit 14 to the estimated temperature calculation process in a certain period (first section A1) after the ignition is turned off when the temperature change of the motor 10 is large, the capacitor of the charge / discharge circuit 14 can be used. It is possible to accurately calculate the estimated temperature of the motor 10 while reducing the capacity and cost.

(3) The control IC 12 sets the execution frequency of the estimated temperature calculation process based on the estimated temperature of the motor 10 when the ignition switch IG is switched off. According to this aspect, it is possible to keep the supply voltage V supplied from the charge / discharge circuit 14 to the control IC 12 to be equal to or higher than the operating voltage Vx of the control IC 12 in the period until the temperature change of the motor 10 becomes gentle. .. As a result, an appropriate estimated temperature calculation process according to the temperature of the motor 10 at the time when the ignition switch IG is switched off can be executed, and as a result, the deviation between the actual temperature of the motor 10 and the estimated temperature can be more preferably suppressed. can.

This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
-In the above embodiment, two sections (first and second sections A1 and A2) having different execution frequencies of the estimated temperature calculation process are set, but the section is not limited to this and the execution frequency of the estimated temperature calculation process is different. The number may be set to 3 or more, and the execution frequency may be set to decrease as the section in the latter stage decreases. Further, the control mode may be such that the execution interval of the estimated temperature calculation process is lengthened for each execution.

-In the above embodiment, the control mode is such that the execution frequency of the estimated temperature calculation process is reduced according to the passage of time, but the control mode is not limited to this, and the power supply from the charge / discharge circuit 14 ends after the ignition switch IG is turned off. The execution timing of the estimated temperature calculation process may be set to a fixed interval (execution frequency is constant) during the period until the calculation is performed.

-In the above embodiment, the motor control device 11 is integrally provided with the motor 10, but the motor control device 11 is provided, for example, on the open / close switch side or the door integrated ECU side for integrated control of electrical components related to the vehicle door D. May be good.

-Although not specifically mentioned in the above embodiment, the motor 10 may be either a brushed motor or a brushless motor.
-In the above embodiment, the motor control device 11 for controlling the power wind motor of the vehicle is applied, but other motors mounted on the vehicle (for example, a slide roof, a slide door, a wiper device, an electric seat, a fan of an air conditioner, etc. It may be applied to a motor control device that controls a drive motor such as a power steering device).

BT ... Vehicle battery, 10 ... Motor, 11 ... Motor control device, 12 ... Control IC, 14 ... Charge / discharge circuit, 15 ... Capacitor.

Claims (5)

It controls the motor mounted on the vehicle, and is a motor control device that stops the energization from the vehicle battery when the ignition is off.
An estimated temperature calculation process for calculating the estimated temperature of the motor based on the drive information of the motor is performed, and a burnout prevention control for stopping the energization of the motor is performed based on the estimated temperature calculated by the estimated temperature calculation process. Control IC and
It is equipped with a charge / discharge circuit including a capacitor that charges the electric power from the vehicle battery when the ignition is on and discharges the charged electric power to the control IC when the ignition is off .
The control IC is a motor control that sets the execution frequency of the estimated temperature calculation process so that the supply voltage to the control IC can be maintained at a voltage higher than the voltage required for the operation of the control IC for a predetermined period from the time when the ignition is turned off. Device. The motor control according to claim 1, wherein the predetermined period differs depending on the temperature of the motor at the time of ignition off, and becomes longer as the temperature of the motor at the time of ignition off becomes higher. Device. The motor control device according to claim 1 or 2 , wherein the control IC reduces the execution frequency of the estimated temperature calculation process according to the passage of time after the ignition is turned off. The motor control device according to any one of claims 1 to 3, wherein the control IC sets the execution frequency of the estimated temperature calculation process based on the estimated temperature of the motor at the time when the ignition is switched off. .. A motor integrally provided with the motor control device according to any one of claims 1 to 4 .

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