JP2022167646A - Drive member control device - Google Patents

Abstract

To provide a drive member control device in which the accuracy of estimating a motor temperature can be increased.SOLUTION: A power window device 2 includes a control unit 8 that controls a motor M for driving a window glass 1, and estimates a motor temperature. The control unit 8 calculates an amount of generated heat according to motor temperatures estimated until the last time, and estimates a motor temperature according to the amount of generated heat.SELECTED DRAWING: Figure 1

Description

The present invention relates to a drive member control device.

Conventionally, there is a drive member control device such as a power window control device that protects the motor by regulating the amount of power supplied to the motor when the estimated motor temperature reaches or exceeds a regulation value (for example, Patent Document 1 reference).

Japanese Unexamined Patent Application Publication No. 2010-11610

However, the driving member control device as described above has a problem that the accuracy of the estimated motor temperature is low. Specifically, in the driving member control device as described above, the motor cannot be protected when the estimated motor temperature is lower than the actual motor temperature, so the estimated motor temperature becomes significantly higher than the actual motor temperature. I had a problem. This causes early limitation of the operation of the motor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a driving member control apparatus capable of increasing the accuracy of an estimated motor temperature.

A drive member control device (2) for solving the above problems is a drive member control device (2) that controls a motor (M) that drives a drive member (1) and that includes a control section (8) that estimates the motor temperature. ), wherein the control unit calculates a calorific value according to at least one of the motor temperature estimated by the previous time and an ambient temperature, and estimates the motor temperature according to the calorific value.

According to this configuration, the control unit calculates the amount of heat generated according to at least one of the previously estimated motor temperature and the ambient temperature. Compared to calculating the amount, the calorific value can be calculated with high accuracy. Therefore, the motor temperature can be estimated with high accuracy.

1 is a schematic circuit diagram of a power window device according to one embodiment; FIG. FIG. 5 is a flowchart for explaining temperature change amount calculation processing of the control unit in one embodiment; FIG. 4 is a characteristic diagram of rotation speed and current value with respect to torque in one embodiment. FIG. 4 is a characteristic diagram of the amount of heat generated with respect to the number of revolutions in one embodiment;

An embodiment of a power window control device will be described below with reference to FIGS. 1 to 4. FIG.
As shown in FIG. 1, a window glass 1 as a drive member provided on a vehicle door D is drivingly connected to a motor M in a power window device 2 as a drive member control device via a regulator (not shown) or the like. The motor M drives the window glass 1 to open and close.

The power window device 2 includes a rotation detection sensor 3 such as a Hall IC that detects the rotation speed of the motor M. As shown in FIG. The power window device 2 controls the duty ratio of the drive circuit 7 based on the signal from the rotation detection sensor 3, the signal from the operation switch 4, the signal from the temperature sensor 5, the voltage of the battery 6, and the like. A control unit 8 for supplying a drive voltage to the motor M is provided. Note that the temperature sensor 5 of the present embodiment is, for example, an outside air temperature sensor for detecting the outside air temperature displayed on the vehicle display. The controller 8 has a memory 9 . The memory 9 stores various information including various preset threshold values.

For example, when the operation switch 4 is operated, the control unit 8 supplies power to the motor M to drive the window glass 1 to open and close. Also, the control unit 8 estimates the motor temperature based on each piece of information.

Specifically, the control unit 8 determines the motor temperature based on the ambient temperature, the drive voltage supplied to the motor M, the number of rotations of the motor M corresponding to the signal from the rotation detection sensor 3, and the elapsed time. presume. Note that the control unit 8 acquires the ambient temperature from the temperature sensor 5 for other uses. Specifically, the controller 8 of the present embodiment acquires the ambient temperature from the temperature sensor 5, which is an outside air temperature sensor for detecting the outside air temperature.

The control unit 8 calculates the amount of heat generated according to the motor temperature estimated up to the last time, and estimates the motor temperature according to the amount of heat generated. Note that the control unit 8 of the present embodiment uses the motor temperature estimated immediately before as it is as the motor temperature estimated up to the last time, but is not limited to this. The value may be used as the previously estimated motor temperature.

Specifically, when the rotational speed of the motor M is smaller than a preset rotational speed threshold, the control unit 8 calculates the amount of heat generated so that the higher the motor temperature estimated up to the last time, the smaller the amount of heat generated. do. At this time, the controller 8 calculates the amount of heat generated based on the characteristics of the motor M as described below.

FIG. 3 is a characteristic diagram of rotation speed and current value with respect to torque in the motor M. In FIG. In FIG. 3, characteristic K1 is the number of rotations when the motor temperature is 70°C, characteristic K2 is the number of rotations when the motor temperature is 25°C, and characteristic K3 is the number of rotations when the motor temperature is -20°C. is the number of rotations of In FIG. 3, the characteristic C1 is the current value when the motor temperature is 70°C, the characteristic C2 is the current value when the motor temperature is 25°C, and the characteristic C3 is the motor temperature of -20°C. is the current value when As shown in FIG. 3, the motor M has a characteristic that when the number of revolutions is low, the current value decreases and the amount of heat generated decreases as the motor temperature increases. When the number of revolutions of the motor M is smaller than a preset number of revolutions threshold value, the control unit 8, based on each data including the characteristics described above, determines that the higher the previously estimated motor temperature, the smaller the amount of heat generated. Calculate the calorific value as follows.

Then, the control unit 8 adds the calculated heat generation amount to the motor temperature estimated immediately before to estimate the latest motor temperature. Note that the control unit 8 estimates the motor temperature to be the same as the ambient temperature acquired from the temperature sensor 5, for example, when the vehicle has been left for a long period of time.

Then, the control unit 8 limits the operation of the motor M based on the estimated motor temperature. The control unit 8 of the present embodiment restricts new operation when the estimated motor temperature exceeds a preset new operation prohibition threshold. Further, when the estimated motor temperature exceeds a preset operation prohibition threshold, the control unit 8 stops the operation even in the middle of the operation.

Next, specific operations and effects of the power window device 2 described above will be described with reference to FIG.
As shown in FIG. 2, the control unit 8 performs the temperature change amount calculation process of step S1 and subsequent steps in each extremely short control period.

In step S1, the control unit 8 determines whether or not the motor M is in operation. If it is determined that it is in operation, the process proceeds to step S2.

In step S2, the control unit 8 determines whether or not the rotation speed of the motor M corresponding to the signal from the rotation detection sensor 3 is smaller than a preset rotation speed threshold. If it is determined that it is not smaller, the process moves to step S5.

In step S4, the control unit 8 calculates the amount of heat generated based on the drive voltage supplied to the motor M, the rotation speed of the motor M corresponding to the signal from the rotation detection sensor 3, and the motor temperature estimated immediately before. do. At this time, the controller 8 calculates the amount of heat generated so that the higher the motor temperature estimated immediately before, the smaller the amount of heat generated.

In step S<b>5 , the controller 8 calculates the amount of heat generated based on the drive voltage supplied to the motor M and the number of rotations of the motor M corresponding to the signal from the rotation detection sensor 3 .
Further, in step S<b>3 , the control unit 8 calculates the heat release amount based on the motor temperature estimated immediately before and the ambient temperature acquired from the temperature sensor 5 . At this time, when the motor temperature estimated immediately before is higher than the ambient temperature, the controller 8 calculates the amount of heat dissipation so that the larger the difference, the larger the amount of heat dissipation.

After completing the above-described temperature change amount calculation process, the control unit 8 adds the calculated amount of heat generation to the motor temperature estimated immediately before, or subtracts the calculated amount of heat dissipation from the motor temperature estimated immediately before to obtain the latest temperature. Estimate the motor temperature.

Then, the control unit 8 limits the operation of the motor M based on the estimated motor temperature. Thereby, for example, the motor M is protected from heat damage.
Next, the effects of the above embodiment will be described below.

(1) Since the control unit 8 calculates the amount of heat generated according to the previously estimated motor temperature, for example, compared to the case where the amount of heat generated is calculated regardless of the previously estimated motor temperature, the amount of heat generated is reduced. It can be calculated with high precision. Therefore, the motor temperature can be estimated with high accuracy.

(2) When the rotation speed of the motor M is smaller than a preset rotation speed threshold, the control unit 8 calculates the heat generation amount so that the heat generation amount decreases as the motor temperature estimated up to the previous time increases. , the calorific value can be calculated with high accuracy.

That is, the motor M has a characteristic that when the number of revolutions of the motor M is small, the current value becomes smaller and the amount of heat generated becomes smaller as the motor temperature rises. Amount can be calculated. As a result, when the motor temperature is high, it is suppressed that the heat generation amount that is significantly larger than the actual heat generation amount is calculated, and it is suppressed that the estimated motor temperature is significantly higher than the actual motor temperature. can do.

It should be noted that when the number of revolutions of the motor M is high, the motor M does not have a simple characteristic in which the amount of heat generated decreases as the motor temperature rises, for example, because the faster the motor M rotates, the greater the heat radiation effect. Sometimes. Therefore, the control unit 8 calculates the amount of heat generated according to the previously estimated motor temperature only when the rotation speed of the motor M is smaller than a preset rotation speed threshold, thereby easily and accurately calculating the heat generation amount. A calorific value can be calculated.

Specifically, for example, as shown in FIG. 4, when the rotation speed of the motor M is smaller than a preset rotation speed threshold A and the motor temperature is high, the estimated heat generation characteristic X1 can be brought close to the characteristic Z1 of the actual expected calorific value.

That is, FIG. 4 is a characteristic diagram of the amount of heat generated with respect to the number of revolutions of the motor M. In FIG. In FIG. 4, the characteristic Z1 is the actual assumed amount of heat generated when the motor temperature is 70° C., the characteristic Z2 is the actual assumed amount of heat generated when the motor temperature is 25° C., and the characteristic Z3 is the actual assumed amount of heat generated when the motor temperature is -20°C. In FIG. 4, the characteristic X1 is estimated by the control unit 8 of the present embodiment when the number of revolutions of the motor M is smaller than the preset number of revolutions threshold value A and the motor temperature is 70°C. is the amount of heat generated. Further, in FIG. 4, the characteristic X2 is the amount of heat generated by the conventional control unit so that the motor M can be protected regardless of the motor temperature. That is, in order to protect the motor M regardless of the motor temperature, the conventional control unit estimates the amount of heat generated so as not to fall below the actual amount of heat generated when the motor temperature is -20°C.

As shown by the characteristic Z1 and the characteristic X1 in FIG. 4, the control unit 8 of the present embodiment operates when the rotational speed of the motor M is smaller than the preset rotational speed threshold value A and when the motor temperature is high. can bring the estimated calorific value closer to the actual calorific value. That is, the characteristic X1 estimated by the control unit 8 of the present embodiment has a value closer to the characteristic Z1 than the characteristic X2 estimated regardless of the motor temperature. In this way, it is possible to prevent the estimated motor temperature from becoming much higher than the actual motor temperature, and it is possible to prevent the operation of the motor M from being restricted early.

This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
In the above embodiment, the controller 8 calculates the amount of heat generated according to the previously estimated motor temperature, but calculates the amount of heat generated according to at least one of the previously estimated motor temperature and the ambient temperature. do it.

For example, the control unit 8 may calculate the amount of heat generated according to the ambient temperature regardless of the motor temperature estimated up to the last time. Specifically, when the rotation speed of the motor M is smaller than a preset rotation speed threshold, the control unit 8 may calculate the heat generation amount so that the higher the ambient temperature, the smaller the heat generation amount. good. Also, at this time, the control unit 8 preferably acquires the ambient temperature from the temperature sensor 5 for other purposes. Note that the temperature sensor 5 for other uses is not limited to the outside air temperature sensor, and may be a temperature sensor of a door ECU provided on the vehicle door D, for example.

Even in this way, the controller 8 can calculate the amount of heat generated with high accuracy. That is, when the number of revolutions of the motor M is low, the electrical resistance of the wiring increases and the current value decreases as the ambient temperature rises. It is possible to calculate the calorific value that takes into account the properties. As a result, when the ambient temperature is high, it is suppressed that the heat generation amount that is significantly larger than the actual heat generation amount is calculated, and it is suppressed that the estimated motor temperature is significantly higher than the actual motor temperature. can do. As a result, it is possible to prevent the operation of the motor M from being restricted early. It should be noted that when the number of rotations of the motor M is high, the motor M does not have such a simple characteristic that the amount of heat generated decreases as the ambient temperature rises, for example, for reasons such as the fact that the faster rotation increases the heat radiation effect. Sometimes. Therefore, the controller 8 calculates the amount of heat generated according to the ambient temperature only when the number of revolutions of the motor M is smaller than the preset threshold number of revolutions, thereby easily and accurately calculating the amount of heat generated. be able to.

In addition, since the control unit 8 acquires the ambient temperature from the temperature sensor 5 for other purposes, a dedicated ambient temperature sensor is unnecessary compared to a configuration using a dedicated ambient temperature sensor for detecting the ambient temperature. As a result, the number of parts can be reduced.

Further, for example, the control unit 8 may calculate the amount of heat generated according to the previously estimated motor temperature and ambient temperature. Specifically, when the rotation speed of the motor M is smaller than a preset rotation speed threshold value, the control unit 8 controls the ambient temperature so that the higher the motor temperature estimated up to the previous time, the smaller the amount of heat generated. The calorific value may be calculated such that the higher the value, the smaller the calorific value.

- In the above-described embodiment, the power window device 2 in which the driving member is the window glass 1 is embodied.

DESCRIPTION OF SYMBOLS 1... Window glass (driving member), 2... Power window apparatus (driving member control apparatus), 5... Temperature sensor, 8... Control part, A... Revolution speed threshold, M... Motor.

Claims (5)

A driving member control device (2) comprising a control unit (8) for controlling a motor (M) for driving a driving member (1) and estimating the motor temperature,
The driving member control device, wherein the control unit calculates a calorific value according to at least one of the motor temperature estimated up to the previous time and an ambient temperature, and estimates the motor temperature according to the calorific value. When the number of rotations of the motor is smaller than a preset number of rotations threshold value (A), the control unit controls the amount of heat generated so that the amount of heat generated decreases as the temperature of the previously estimated motor increases. 2. A drive member control device according to claim 1, wherein: 1 or 2, wherein, when the rotation speed of the motor is smaller than a preset rotation speed threshold, the control unit calculates the heat generation amount so that the heat generation amount decreases as the ambient temperature increases. 3. The driving member control device according to 2. 4. The driving member control device according to any one of claims 1 to 3, wherein the control unit acquires the ambient temperature from a temperature sensor (5) for other uses. The drive member control device according to any one of claims 1 to 4, wherein the control section limits the operation of the motor based on the estimated motor temperature.

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