KR20080044378A - Sunroof control method and control unit - Google Patents

Abstract

A sunroof control method is provided to secure coping time, and to prevent injury when a human body is caught in a sunroof. A sunroof control method comprises the steps of: closing a sunroof(40) in first speed from an opened position to a predetermined position at the time of sunroof closing; closing a sunroof in second speed slower than the first speed from the predetermined position to a closed position; judging if a human body or an object is caught in the sunroof; and driving a BLDC motor(30) backward and opening the sunroof when it is judged that a human body or an object is caught in the sunroof.

Description

SUNROOF CONTROL METHOD AND CONTROL UNIT}

1 is a view showing an embodiment of the control device of the present invention.

2 is a diagram illustrating a control algorithm when the sunroof is closed in the control method of the present invention.

3A is a diagram illustrating a current applied to a BLDC motor when a human body or an object is not caught in the control method shown in FIG. 2.

FIG. 3B is a diagram illustrating a current applied to a BLDC motor when a human body or an object is caught in the control method shown in FIG. 2.

4 is a diagram illustrating a control algorithm when the sunroof is frozen when the sunroof is opened in the control method of the present invention.

FIG. 5 is a diagram illustrating a current applied to a BLDC motor in the control method shown in FIG. 4.

6 is a view showing a current applied to the BLDC motor in the prior art, Figure 6a is a case where the human body or the object is not caught in the sunroof closed, Figure 6b is a case where the human body is caught in the sunroof closed It is about.

* Description of the main parts of the drawings *

10: power supply unit 11: EMI filter

20: motor drive circuit 21: inverter

22: current sensor 30: BLDC motor

31: Hall sensor 40: Sunroof

50: control unit 51: comparison operation unit

52: PWM control unit

The present invention relates to a sunroof control method and a control device for use in a vehicle, and more particularly, to secure a time to respond when the human body or objects are caught when the sunroof is closed, to prevent injury, and also to sunroof If the system does not work well due to freezing, etc., it is about a sunroof control method and control device that can automatically solve this problem.

FIG. 6 is a diagram illustrating a current applied to a sunroof driving motor motor in the related art, and FIG. 6A illustrates a case where a human body or an object is not caught when the sunroof is closed. In section (a), the current applied to the drive motor is constant so that the sunroof operates at a constant constant speed, and when the opening and closing is completely completed, the current value is increased for sealing as in section (b).

When the human body or the object is caught during the sunroof closing, the current applied to the motor is rapidly increased due to the increase of the motor load as shown in the section (b) of FIG. 6A. In this case, in the sunroof control system, the current is supplied in the same manner as in section (c), but the motor is rotated in the reverse direction to prevent damage to the human body or damage to the sunroof.

However, in the prior art, as shown in the section (a) of FIG. 6a or the section (a) of FIG. 6b, the sunroof is closed at a relatively high speed, so that if there is a human body or an object in the section, it can be recovered. There is a problem that the corresponding response time is not sufficiently secured.

In addition, even if the sunroof is caught without being avoided, the movement speed of the sunroof increases and the amount of impulse delivered to the human body increases, resulting in a large degree of injury. In particular, the reflex nerve and the body's resistance strength are increased. This is more of an issue for children who are somewhat older or for the elderly.

On the other hand, the sunroof itself also causes a burden on the sunroof itself due to the pinch of the human body or objects, causing problems in the lifespan or reliability of the sunroof.

In addition, when the sunroof is often frozen in winter, when the sunroof is operated excessively for the operation of the sunroof, the sunroof system is unreasonable. Therefore, in order to operate the sunroof, there is a problem in that an inconvenience of waiting for the frozen portion to melt after a certain time has elapsed after the start of the vehicle occurs.

In order to solve this problem, an attempt was made to control the sunroof closing speed by controlling the DC motor, which is a sunroof driving motor. However, in order to control the DC motor speed, the voltage itself must be lowered. However, this is a situation in which the driving force of the motor decreases and the rotation of the motor is not constant due to the reduction of the motor torque, thereby lowering the reliability of the product.

The present invention is to solve the above-mentioned problems, the sunroof to ensure that even when the human body or the object is caught when the sunroof is closed, the sunroof to ensure that even if the human body is stuck to prevent significant injury It is an object to provide a control method and a control device.

In addition, an object of the present invention is to provide a sunroof control method that enables the sunroof to operate even when the sunroof is frozen in a cold weather without burdening the sunroof without the burden on the sunroof.

Still another object of the present invention is to provide a device capable of maintaining a constant motor speed and drive torque even when the above-mentioned sunroof control is performed.

The control method of the present invention comprises the steps of: (a) closing the sunroof at a first speed from an open position to a predetermined position during sunroof closing; (b) closing the sunroof at a second speed slower than the first speed from the predetermined position to the closed position.

In the control method of the present invention, the step (b) includes (c) determining whether the human body or the object is caught in the sunroof, and (d) driving the BLDC motor in the reverse direction when it is determined that the human body or the object is caught. And controlling to open the sunroof.

The control method of the present invention further includes (e) determining whether the sunroof is frozen when the sunroof is opened, and (f) if the sunroof is determined to be frozen, driving the BLDC motor in reverse direction for a predetermined time and then driving it forward again. And (g) repeating steps (e) and (f) until the sunroof icing is released.

In the control method of the present invention, the determination of the step (c) determines that the human body or the object is caught when the change value Δi of the current value at each instant from the current sensor is larger than the set change value Δi ₀ . It is characterized by consisting of.

In the control method of the present invention, the determination of the step (e) determines that the human body or the object is caught when the change value Δi of the current value at each instant from the current sensor is larger than the set change value Δi ₀ . It is characterized by consisting of.

In addition, the control method of the present invention is characterized in that (h) the step of closing the sunroof to the vehicle opening to the vehicle opening portion when the sunroof reaches the closed position is performed after the step (b).

On the other hand, the control device of the present invention is a BLDC motor for driving the sunroof, a motor speed detection unit for detecting and transmitting the rotational speed of the BLDC motor, a signal transmitted from the motor speed detection unit is input, the input signal A control unit having a PWM control unit for controlling a required output signal according to the present invention, an inverter for applying a current according to the signal output from the control unit to drive the BLDC motor forward or reverse, and a current applied to the BLDC motor. And a motor drive circuit having a current sensor for sensing and transmitting the current to the control unit, wherein the control unit closes the sunroof at a first speed from an open position to a predetermined position when the sunroof is closed, And a control logic for closing the sunroof at a second speed slower than one speed.

The control device of the present invention is characterized in that the control unit includes a comparison operation unit which calculates a change value of the current value at each instant input from the current sensor and compares the change value with a predetermined set change value.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the sunroof controller of the present invention includes a power supply unit 10, a motor driving circuit 20 connected to the power supply unit, and a BLDC driven by receiving current from the motor driving circuit 20. Motor 30, a sunroof 40 driven by the BLDC motor, and a control unit 50 for controlling the drive of the BLDC motor.

The power supply unit 10 is supplied with power from a vehicle or the like as a DC power supply unit, and an EMI (Electromagnetic Interference) filter is attached between the power supply unit 10 and the motor driving circuit 20 to remove noise from the power supply unit 10. The motor drive circuit 20 functions to prevent damage to internal components.

The motor drive circuit 20 includes an inverter 21 and a current sensor 22. Inverter 21 is a three-phase inverter of a conventional configuration, the current sensor 22 is provided for each phase one by one to detect the current value applied to the BLDC motor 30 from the inverter 21 to continuously control unit 50 To send. As the current sensor 22, a sensor of a known configuration such as an encoder or resolver may be used.

The BLDC (BrushLess Direct Current) motor 30 is provided with a hall sensor 31 to transmit the detected pulse to the control unit 50 to provide information on the rotation speed of the BLDC motor 30.

The sunroof 40 is a member for opening and closing the roof opening of the vehicle in the sunroof device of a known configuration, and is formed of a transparent resin material or the like.

The control unit 50 is composed of a microcomputer and includes a comparison operation unit 51 and a PWM (Pulse Width Modulation) control unit 52.

The comparison operation unit 51 calculates a current variation value Δi = i _2- i ₁ corresponding to the current of each time from the current values i ₁ , i ₂ ,... At each time input from the current sensor 22. operation, and to operate to compare it to the control unit setting a predetermined fluctuation (△ i ₀₎ of the pre-50, it is determined whether the human or object yeotneun it into the sunroof.

The setting variation value Δi ₀ may be set differently as needed for the case of judging the human body or the object and the case of determining the sunroof ice.

The PWM controller 52 controls the pulse width through the on / off duty control using the switching element to control the current value applied to the BLDC motor 30.

According to the detection result, the control unit 50 transmits the pulse width control signal through the PWM control unit 52 to the inverter 21 of the drive circuit 20 to control the driving of the BLDC motor 30.

Hereinafter, a sunroof closing control method using the sunroof system of the present invention will be described with reference to FIGS. 2 to 3.

First, the steps may be executed (S10) to the operator operating the sunroof closing switch (S _c) as shown in Figure 2 drives the sunroof.

Next, a step (S11) of controlling to drive the sunroof at a predetermined first predetermined speed is performed. In the control unit 50, as shown in section (a) of FIG. 3A, the PWM control signal input to the control unit 50 in advance is transmitted to the motor drive circuit 20 by the PWM control unit 52 to provide a BLDC motor. The current applied to 30 is made constant to keep the first speed constant.

During the execution of the first speed control step S11, the current values i ₁ , i ₂ ,... At each instant applied to the BLDC motor 30 are input to the comparison operation unit 51 of the control unit 50. Then, the current variation value? I = i ₂ -i ₁ is calculated and compared with the set variation value? I ₀ to determine whether the human body or the object is caught (S12).

If the current variation value Δi is greater than the set variation value Δi ₀ in the step S12 of determining whether the human body or the object is caught (see section (c) of FIG. 3B), the human body or object is caught in the sunroof and the BLDC motor Since the load on 30 is increased, the step S20 of driving the BLDC motor 30 in the reverse direction as shown in section (d) of FIG. 3B is performed to return the sunroof to the original open position. .

On the other hand, when it is determined in the step S12 whether the human body or the object is caught, it is determined that the current variation value Δi is not greater than the set variation value Δi ₀ , the first speed control S11 is continued.

In the sunroof predetermined position arrival determination step (S13), the first number in which the sum (∑ N) of the number of pulses input from the hall sensor 31 to the control unit 50 in advance during the first speed control step S11 is set in advance; If the speed control end pulse number N _h is greater than, it is determined that the sunroof has reached a predetermined position and the first speed control step S11 is finished.

When the first speed control step S11 is completed, as shown in the section (b) of FIG. 3A, the BLDC motor 30 is applied with a current lower than the current applied at the first speed, thereby lowering the speed below the first speed. A second speed control step (S14) of driving the sunroof at a second speed is performed.

The second speed control step (S14) is a safety section, so the closing of the sunroof proceeds slowly so that a reaction time can be secured when a human body or an object is caught, thereby easily recovering the human body or an object.

In addition, even when the human body or the object is caught, the sunroof proceeds at a low speed, so that the amount of impact applied is small, thereby reducing the injuries or damage to the human body.

On the other hand, also in the control for achieving the second speed control, the PWM control using the BLDC motor can precisely control the speed control to be changed without hindering the motor driving torque as compared with the case of using a general DC motor. It has an advantageous effect in that it is.

In the second speed control step S14, as in the step S12 of determining whether the human body or the object is caught in the first speed control S11, the current fluctuation value? I and the set fluctuation value? I ₀ are compared and determined. Or determining whether the object is stuck (S15).

If the current fluctuation value? I is not greater than the set fluctuation value? I ₀ in the step S15 of determining whether the human body or the object is caught, the sunroof closing position reaching decision step is performed while continuously performing the low speed constant speed step S16. ).

On the other hand, if the current fluctuation value (△ i) is greater than the set variation value (△ i ₀ ) in the human body or object jammed determination step (S16), since the human body or things are caught, as in the first speed control step BLDC motor (30) ) Is reversely driven (S20) to return the sunroof to the initial open position (S20).

In the sunroof closing position reaching determination step (S16), when the current change value Δi is larger than the set change value Δi ₀ , it is determined that the sunroof has reached the closed position. As described above, the closed control step S17 of the BLDC motor 30 is executed to apply a larger current than during driving so that the sunroof can be sealed to the vehicle opening.

Meanwhile, in another embodiment of the present invention, when the sunroof is opened, a freezing release mode for releasing the sunroof may be added, which will be described with reference to FIGS. 4 and 5.

First, the sunroof opening switch S _O is operated to drive the sunroof.

During the operation of the sunroof, the step S31 of calculating the current fluctuation value? I applied to the BLDC motor 30 and comparing it with a predetermined set change value? I ₀ is performed to determine whether the sunroof is frozen. do.

In the sunroof determination step S31, if it is determined that the applied current fluctuation value? I is not greater than the set fluctuation value? I ₀ , the sunroof is opened by performing the BLDC motor 30 opening control step S32. Let's do it.

On the other hand, when the current fluctuation value? I applied in the sunroof ice determination step S30 is larger than the set fluctuation value? I ₀ , it indicates that the sunroof is frozen, so that the BLDC motor 30 is driven in a reverse direction for a predetermined time. After that, the step (S33) of driving forward again is performed.

At this time, the reverse driving time of the BLDC motor 30 is determined by the number of pulses input to the control unit 50 in the hall sensor 31. That is, when the number of pulses input from the hall sensor 31 to the control unit 50 reaches a predetermined predetermined number of pulses, the reverse driving ends and the BLDC motor 30 is forward driven again.

Then, the sunroof freezing determination step (S31) is performed again until it is determined that the sunroof ice is released, that is, when it is determined that the current variation value Δi is not greater than the set variation value Δi ₀ . The step S33 of forward driving the BLDC motor 30 after the predetermined time reverse driving is repeatedly performed.

As described above, by repeating the operation of changing the driving direction in the forward and reverse directions of the BLDC motor 30 for a short time, the vibration is ultimately applied to the sunroof so that the sunroof of the sunroof is released.

In addition, such forward and forward repetitive control can be achieved by PWM control of the BLDC motor 30, and has a more advantageous effect in terms of controllability and reliability than in the case of using a general DC motor.

The present invention has the effect of preventing the injury of the human body or damage to the sunroof by immediately recovering even when a human body or an object is caught when the sunroof is closed.

In addition, even when the human body or the object is stuck, the sunroof proceeds at a low speed, so the amount of impact applied is small, thereby alleviating the injury or damage of the human body, and also works when the human body or the object is caught.

In addition, the sunroof itself can immediately respond to human body or object jamming due to the low driving speed of the sunroof, thereby reducing the burden of impact on the sunroof and having an advantageous effect on lifetime and reliability.

On the other hand, the present invention has the effect that even when the sunroof is frozen in cold weather, the sunroof can be easily operated without waiting for the sunroof to thaw or without any special work for the freezing of the sunroof without burdening the sunroof. Have

Moreover, even when the above-described control is performed, it is possible to maintain a constant motor rotation speed and driving torque, thereby ensuring a reliable sunroof control.

Claims (8)

A method of controlling a sunroof for opening and closing a vehicle opening, (a) closing the sunroof at a first speed from an open position to a predetermined position when the sunroof is closed; (b) closing the sunroof at a second speed slower than a first speed from the predetermined position to the closed position. The method of claim 1, wherein step (b) (c) determining whether a human body or an object is caught in the sunroof; (d) controlling the sunroof to open the sunroof by reversely driving the BLDC motor when it is determined that the human body or the object is caught. The method of claim 1 or 2, further comprising (e) determining whether the sunroof is frozen when the sunroof is opened; (f) if it is determined that the sunroof is frozen, driving the BLDC motor in a reverse direction for a predetermined time and then driving it forward again; (g) repeating steps (e) and (f) until the sunroof ice is released. The method of claim 2, The determination of step (c) comprises determining that the human body or the object is caught when the change value? I of the current value at each instant from the current sensor is larger than the set change value? I ₀ . Loop control method. The method of claim 3, wherein The determination of the step (e) comprises determining that the human body or the object is caught when the change value? I of the current value at each instant from the current sensor is larger than the set change value? I ₀ . Loop control method. The method according to claim 1 or 2, and (h) sealing the sunroof to the vehicle opening when the sunroof reaches the closed position, after step (b). BLDC motor for driving sunroof, A motor speed detector for detecting and transmitting a rotation speed of the BLDC motor; A control unit having a PWM control unit for inputting a signal transmitted from the motor speed detecting unit and controlling a required output signal according to the input signal; And a motor driving circuit having an inverter applying a current according to the signal output from the control unit to drive the BLDC motor forward or reverse, and a current sensor for sensing the current applied to the BLDC motor and transmitting the current to the control unit. The control unit includes a control mode for closing the sunroof at a first speed from the open position to a predetermined position when the sunroof is closed, and closing the sunroof at a second speed slower than the first speed from the predetermined position to the closed position. Sunroof control device characterized in that. The method of claim 7, wherein And the control unit includes a comparison operation unit which calculates a change value of the current value at each instant input from the current sensor and compares the change value with a predetermined set change value.

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