JP2790763B2 - Power window drive controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch for stopping or reversing the driving of a motor when a door glass is moved up and down by a driving force of a motor. The present invention relates to a power window drive control device that controls driving of a motor so as to perform an avoidance process.

[0002]

2. Description of the Related Art In a power window device, a motor is applied to raise and lower a door glass. By operating a switch provided in a vehicle interior (for example, a door trim), the motor is driven to be fully closed. Or the door glass is moved until it is fully opened. Here, if a foreign object is caught between the door glass and the window frame, the movement is prevented, so that the rotation speed of the motor decreases. It has been considered to stop driving the motor when the motor rotation speed is equal to or lower than a predetermined value. In this case, in order to distinguish between the fully-closed state and the foreign matter trapping, a fully-closed detection sensor for detecting that the door glass is near the fully-closed state is provided, or the fully-closed state is detected by detecting the number of pulses with a pulse encoder. It has recognized. In addition, at the time of pinching foreign matter, the motor is reversed for a predetermined time,
At the time of full closing, it is conceivable that the driving of the motor is slightly continued to retighten the door glass.

[0003]

However, the rotational speed of the motor can also be caused by a decrease in the power supply voltage. That is, when one or more other door glasses start operating during the closing operation of one door glass, the inrush current at the time of starting the motor is 15 to 20 A (10 ms) per motor. The power supply voltage supplied to the power supply drops sharply. Also, when the other motor is locked (lock current 15A to 20A, 0.4 to 0.8S), the power supply voltage supplied to the motor drops sharply. Due to the sudden decrease in the power supply voltage, the rotation speed of the motor of the door glass during the closing operation is reduced, and it may be erroneously detected that the door glass is jammed.

[0004] In view of the above fact, the present invention ensures that when the opening / closing operation of another door glass is started or locked while the door glass is being closed, the door that is being closed reliably even if the power supply voltage drops. It is an object of the present invention to provide a power window drive control device capable of detecting entrapment in glass.

[0005]

According to the first aspect of the present invention, there is provided an entrapment avoiding process for stopping or reversing the driving of a motor when a foreign object is entrapped during a lifting operation of a door glass by a driving force of a motor. A power window drive control device that controls the drive of the motor to perform, a voltage detection unit that detects a power supply voltage that drives the motor, a rotation speed detection unit that detects the rotation speed of the motor,
First determining means for determining whether or not the amount of decrease in the power supply voltage detected by the voltage detecting means when the rotational speed of the motor detected by the rotational speed detecting means decreases by a predetermined amount is equal to or less than a predetermined value; An instructing unit that instructs execution of the entrapment avoiding process when the first identifying unit determines that the value is equal to or smaller than a predetermined value;
have.

According to a second aspect of the present invention, when a foreign object is caught during the ascending and descending operation of the door glass by the driving force of the motor, the motor is driven so as to stop or reverse the driving of the motor. A power window drive control device for controlling the motor, a voltage detection means for detecting a power supply voltage for driving the motor, a rotation speed detection means for detecting the rotation speed of the motor, the motor of the motor with respect to the decrease amount of the power supply voltage A second determining means for determining whether or not the correlation between the absolute amount of the decrease in the rotational speed or the inclination of the change in the rotational speed is equal to or greater than a predetermined value; and Instruction means for instructing execution of the pinch avoidance processing.

[0007]

According to the first aspect of the present invention, the causes of the decrease in the number of rotations of the motor include a case where the power supply voltage decreases and a case where a foreign object is caught during the closing operation of the door glass. It is not possible to judge that the jamming is caused only by the decrease in the motor speed.

Therefore, the first determining means determines whether or not the amount of decrease in the power supply voltage detected by the voltage detecting means when the motor speed decreases by a predetermined amount is equal to or less than a predetermined value.

The decrease in the motor rotation speed due to the foreign matter being caught occurs immediately after the foreign matter is caught, so that the amount of decrease in the power supply voltage is extremely small.

On the other hand, a decrease in the motor speed due to a decrease in the power supply voltage does not cause a decrease in the motor speed unless the power supply voltage decreases.

Therefore, when the amount of decrease in the power supply voltage when the motor rotation speed decreases by a predetermined amount is small, it can be determined that the object is jamming. At this time, an instruction to execute the jamming avoiding process is issued by the instruction means. For example, it is possible to prevent the pinching avoidance processing from being performed by mistake when the number of rotations of the motor decreases due to a decrease in the power supply voltage.

According to the second aspect of the present invention, there is a case where the power supply voltage is reduced and the pinching is performed almost simultaneously.
In such a case, the second determining means determines whether or not the correlation between the absolute amount of the decrease in the rotation speed of the motor or the inclination of the change in the rotation speed with respect to the decrease amount of the power supply voltage is equal to or greater than a predetermined value.
That is, based on a decrease in the motor rotation speed caused by a decrease in the power supply voltage, if the pinching occurs at the same time, the absolute amount or the inclination increases.

For this reason, the motor rotation speed is detected, and if the absolute amount of the reduction in the motor rotation speed or the gradient of the change in the rotation speed is equal to or greater than the absolute amount or the gradient of the reduction in the rotation speed caused by the power supply voltage drop, pinching occurs. You can judge that it is.

[0014]

As shown in FIG. 2, the window regulator section 16 is of a so-called wire type in this embodiment, and a rotating plate 22 mounted on a drive shaft of a motor 22.
A is wound around the wire. The end of this wire is connected to a holding channel 24 supporting the lower end of the door glass 20.
The holding channel 24 is attached to the main guide 26 so as to be vertically movable. Thus, when the motor 22 rotates in the forward and reverse directions, this rotational driving force is transmitted via the wire, and the door glass 20 is rotated.
Move up and down along the glass guide 18.
The configuration of the window regulator section 16 is not limited to such a wire type, but may be an X-arm type or a so-called motor self-propelled type in which the motor itself moves along a rack.

When the door glass 20 is raised by the motor 22, the peripheral end of the door glass 20 is made of a rubber weather strip (not shown) in the frame 12A of the door 12.
And the opening of the door frame 12A is closed. When the door glass 20 is moved downward by the rotation of the motor 22, the opening of the frame 12A of the door 12 is opened.

The motor 22 is operated by an auto / manual switch 34. As the auto / manual switch 34, for example, a switch which can be operated in two steps in both directions can be applied.
Motor 22 is driven (manual operation), and the door glass 2 is operated even when the switch is released by operating the two-stage operation.
The motor 22 is driven until 0 reaches a predetermined position (automatic operation). Further, the motor 22 includes a rotating plate 22A.
(Shown in FIG. 2) can be rotated in either forward or reverse direction to raise or lower the door glass 20.

FIG. 1 shows a power window control unit 50 for controlling the driving of the motor 22 by operating an auto / manual switch 34. The power window control unit 50 is connected to a positive terminal of the battery 60 via a voltage detection circuit 51. The negative terminal of the battery 60 is grounded.

The power window control unit 50 has an automatic /
Signal line 52 from each switch of manual switch 34
Is connected, and this auto / manual switch 3
A drive current for forward rotation and reverse rotation is sent to the motor 22 in accordance with the operation state of No. 4.

The power window control unit 50 includes first and second relay coils 110 and 11 for opening and closing the door glass.
2 are connected to each other, and by operating the auto / manual switch 34, one of the relay coils 110 and 112 is excited.

The first relay coil 110 is for closing the door glass, and corresponds to the first relay switch 108. Common terminal 108A of first relay switch 108
Is connected to one end of the motor 22. The first contact 108B is connected to the positive terminal of the battery 60, and the second contact 108C is grounded.

When the first relay coil 110 is not energized, the first relay switch 108 is connected to the second contact 10
8C.

On the other hand, the second relay coil 112 is for opening the door glass, and corresponds to the second relay switch 109. Common terminal 10 of second relay switch 109
9A is connected to the other end of the motor 22. The first contact 109B is connected to the positive terminal of the battery 60, and the second contact 109C is grounded.

Here, when the second relay coil 112 is not energized, the second relay switch 109 is connected to the second contact 10
It has switched to 9C.

Therefore, when the first relay coil 110 is excited, a current flows from one end of the motor 22 to the other end, and the motor 22 rotates forward to move the door glass in the closing direction. Also, when the second relay coil 112 is excited, a current flows from the other end to one end of the motor 22 and the motor 2
2 can be reversed to move the door glass in the opening direction.

A pulse encoder 62 is attached to the motor 22, and a signal line 64 of the pulse encoder 62 is connected to the power window control circuit 50. Therefore, the power window control circuit 50 can obtain the number of revolutions of the motor 22 based on the pulse signal supplied from the pulse encoder 62. Also, this pulse encoder 6
By counting the signals from 2, the position of the door glass 20 can be confirmed to some extent.

Here, if foreign matter is caught during the closing operation of the door glass 20, a load is applied to the rise of the door glass,
The rotation speed of the motor 22 decreases. The power window control circuit 50 of the present embodiment detects the decrease in the number of revolutions of the motor 22, determines that the foreign matter is caught, stops the driving of the motor 22, and performs a clogging avoiding process of slightly lowering the door glass. It is supposed to do.
This can prevent damage to foreign matter and damage to the door glass itself.

Although the rotation speed of the motor 22 decreases even when the motor is fully closed, a pulse signal from the pulse encoder 62 can be used to recognize that the motor is near the fully closed position. For example, a retightening process is performed.

As described above, in this embodiment, when the rotational speed of the motor 22 decreases (except for the fully closed state and the fully open state), the entrapment avoiding process is performed. This may also occur when an inrush current occurs immediately after the opening / closing operation of the other door glass 20 is started, or when a lock current occurs when another motor is locked (FIG. 4A).
reference). In order to prevent erroneous determination of the decrease in the rotation speed of the motor 22 due to the occurrence of the rush current or the lock current as foreign matter being caught, the power window control circuit 50 determines whether the amount of voltage decrease detected by the voltage detection circuit 51 is equal to or less than a predetermined value. , The cause of the decrease in the rotation speed of the motor 22 is determined.

That is, a decrease in the rotation speed of the motor 22 due to the rush current or the lock current can occur only after the power supply voltage has decreased due to the rush current or the lock current (see FIG. 4A).

On the other hand, the motor 22
The decrease in the number of rotations is that the power supply voltage is normal at the start of pinching, and the rotation speed of the motor 22 decreases due to the load while the pinch is gradually sandwiched. As a result, the power supply voltage decreases. The amount of decrease is extremely small (FIG. 4
(B)). As described above, the generation timing and the voltage reduction amount of the two power supply voltages and the motor rotation speed are clearly different.

For this reason, as described above, if the voltage drop amount is used as a reference, the factors (inrush current or lock current,
Pinching) can be determined.

Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG.

In step 200, it is determined whether or not an instruction to close the door glass 20 has been given by operating the auto / manual switch 34. If the determination is affirmative, the process proceeds to step 202 to drive the motor 22 ( Forward rotation). That is, by exciting the first relay coil 110, the first relay switch 108 is switched to the first contact 108B. Thereby, the motor 22
Is driven, and the door glass 20 starts to rise.

In the next step 204, the pulse signal from the pulse encoder 62 is fetched, and it is determined from the number of pulses whether or not the shutter is almost fully closed.
In step 08, the flag F is set (1), and the process proceeds to step 212. In the case of a negative determination, the flag F is set in step 210.
Is reset (0), and the routine proceeds to step 212. That is, it is possible to determine whether or not the door glass 20 is at a position close to the fully closed state in the state of the flag F.

In the next step 212, it is determined whether or not the number of revolutions of the motor 22 has decreased (entrapment detection level). If the determination is negative, the process returns to step 204.

If an affirmative determination is made in step 212, it is determined in step 214 whether the flag F is set (1). If an affirmative determination is made, the door glass 20 hits the door frame 12A and the motor 22 It is determined that the rotation speed of the motor 22 has decreased, and the process proceeds to step 216 to perform the retightening process.
Stop driving.

On the other hand, if a negative determination is made in step 214, it is determined in step 220 whether the amount of decrease in the power supply voltage is equal to or less than a predetermined value.

That is, the door glass 20 is fully closed (fully opened).
Factors that cause the rotation speed of the motor 22 to decrease besides those other than the pinching of foreign matter, include a rush current generated at the start of elevating another door glass or a lock current generated when another motor is locked. This may be due to a decrease in the power supply voltage.

The reduction in the power supply voltage due to the rush current or the lock current of another motor occurs before the rotation speed of the motor 22 decreases, and the reduction amount is large. On the other hand, the decrease in the power supply voltage due to the foreign object
Does not occur unless the number of rotations decreases, and the decrease is extremely small. Therefore, by determining whether or not the amount of decrease in the power supply voltage is equal to or less than the predetermined value in step 220, it is possible to recognize the cause of the decrease in the rotation speed of the motor 22.

That is, when a negative determination is made in step 220, it is determined that the rotation speed of the motor 22 is decreased due to the rush current or lock current of another motor, and the process returns to step 204 to raise the door glass 20. continue. If an affirmative determination is made in step 220, it is determined that the rotation speed of the motor 22 is reduced due to the foreign object being caught,
The process proceeds to step 222 to perform a pinch avoidance process.
The entrapment avoiding process is, for example, a process in which the motor 22 is temporarily stopped and slightly reversed to stop the motor after a gap is formed between the foreign matter and the door glass.

As described above, in detecting foreign matter being caught by a decrease in the number of revolutions of the motor 22, it is caused by a rush current generated at the start of the elevating operation of another door glass or a lock current generated at the time of a locked state. It is possible to reliably distinguish a decrease in the number of rotations of the motor 22 and eliminate a problem such as erroneous detection of entrapment.

In the present embodiment, the pinch or the inrush current (or the lock current) is determined based on the amount of decrease in the power supply voltage when the rotational speed of the motor 22 decreases. The above determination can be made by determining the correlation between the absolute amount of the number decrease or the slope. That is, in the case of pinching, the rotation speed of the motor 22 decreases according to the load of the motor 22 and the power supply voltage decreases, so that the reduction amount of the rotation speed of the motor 22 is larger than the voltage reduction amount (or , The amount of change is large).

On the other hand, since the power supply voltage drops sharply due to the rush current, the motor 2
2. The amount of decrease in the number of rotations is small (or the amount of change is small).

In this manner, by determining the correlation between the absolute amount or inclination of the rotation speed of the motor 22 and the amount of reduction in the power supply voltage, it is possible to determine whether the current is pinching or inrush current. Further, in this case, it is possible to reliably determine the case where an inrush current occurs simultaneously with the pinching. That is, when the rotation speed of the motor 22 decreases due to the inrush current or the lock current (the motor 22
If the rotation speed decreases (FIG. 4B), the inclination or the absolute amount increases beyond the characteristic of FIG.
By determining whether or not the value is equal to or higher than the reference based on the state shown in FIG. 4A, it is possible to reliably determine even if inrush current (or lock current) and pinching occur simultaneously.

[0045]

As described above, in the power window drive control device according to the present invention, the opening / closing operation of another door glass is started during the closing operation of the door glass, and the closing operation is surely performed even if the power supply voltage drops. Has an excellent effect that it is possible to detect entrapment by the door glass.

[Brief description of the drawings]

FIG. 1 is a drive circuit diagram of a power window according to an embodiment.

FIG. 2 is a perspective view showing an internal structure of a driver's seat side door.

FIG. 3 is a control flowchart showing an entrapment detection control routine.

FIG. 4 (A) is a voltage characteristic diagram caused by the occurrence of an inrush current,
FIG. 6B is a voltage characteristic diagram resulting from pinching.

[Explanation of symbols]

Reference Signs List 10 power window drive control device 22 motor 50 power window control device (first determination means,
Indication means) 51 voltage detection circuit (voltage detection means) 62 pulse encoder (rotation speed detection means)

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) E05F 15/10 B60J 1/17

Claims (2)

(57) [Claims] 1. A power window drive control for controlling the drive of a motor so as to perform a trapping avoidance process of stopping or reversing the drive of a motor when a foreign object is trapped during a lifting operation of a door glass by a driving force of the motor. An apparatus, comprising: voltage detection means for detecting a power supply voltage for driving the motor; rotation number detection means for detecting a rotation number of the motor; and a predetermined amount of rotation number of the motor detected by the rotation number detection means. First determining means for determining whether or not the amount of decrease in the power supply voltage detected by the voltage detecting means at the time of reduction is equal to or less than a predetermined value; and when the first determining means determines that the amount is equal to or less than a predetermined value,
A power window drive control device, comprising: an instruction unit that instructs execution of the entrapment avoidance process. 2. A power window drive control for controlling the driving of the motor so as to perform a trapping avoiding process of stopping or reversing the driving of the motor when a foreign object is trapped during the raising / lowering operation of the door glass by the driving force of the motor. An apparatus, comprising: voltage detection means for detecting a power supply voltage for driving the motor; rotation speed detection means for detecting a rotation speed of the motor; and an absolute amount of reduction in the rotation speed of the motor with respect to a reduction amount of the power supply voltage. Second determining means for determining whether or not the correlation of the inclination of the rotation speed change is equal to or greater than a predetermined value; and executing the entrapment avoidance processing when the second determining means determines that the correlation is equal to or greater than a predetermined value. A power window drive control device, comprising: an instruction means for instructing.