JPH08218730A - Controller for power window and control method thereof - Google Patents

Abstract

PURPOSE: To eliminate malfunctions of a window control, by obtaining a decelerating speed on the basis of signals from a motor revolution-detecting circuit and stopping the motor when the figure is faster than a specified one. CONSTITUTION: An UP-switch 12 is pushed to output an instruction for raising a window and rotate a motor 16 and the revolution pulse signal of a revolution sensor attached to the rotary shaft is measured to calculate the revolutional speed from the pulse frequency. And on the basis of the result, the variation ratio of the revolutional speed is calculated. When it is the same with a specified threshold or larger than it, it is judged that a large deceleration has been done and the driving motor of window is suspended as the uppermost position at that time. When it is lower than the threshold, it is judged that it should be raised still more and the window is raised continuously. By repetition of the judging operation, the upper end position can be detected without much difference from the case of the actual threshold. And hence, the motor 16 is not loaded with an excessive force. The detection of the lower end position is done likewise with the detection of the upper end position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power window device, and more particularly to a control device and a control method for automatically opening and closing a window glass for a vehicle.

[0002]

2. Description of the Related Art Conventionally, a power window mechanism for raising and lowering a window glass of a vehicle by using a motor has been widely used instead of manually. The power window can be opened and closed with one touch, so there is little impact on driving,
It is convenient. In a control device that has been put into practical use as a power window device for this purpose, various measures are taken in case of a failure in the operation of the window.

For example, it is assumed that a person's hand or face is placed in a space area through which glass moves up and down, and the glass is sandwiched between a window and a window frame, and safety is maintained with respect to the sandwiched human body. There is trapping detection and control of the reversing / lowering operation. Alternatively, when the motor is fully opened or closed, driving the motor further causes the load to become excessive, resulting in a large current flow, wasting energy, and shortening the life of the motor. , It is necessary to always keep track of the fully closed position, and there is control to prevent the motor from being driven more than necessary.

Therefore, at the upper end where the window is closed or the lower end where the window is open, control is performed such as reversing the window driving motor while confirming the position using the means for detecting the position. For example, there is a method in which the opened lower end position is set as a reset position and the upper end position is pulse-counted and stored so that the window position is always grasped by counting the pulses. Alternatively, in Japanese Utility Model Publication No. 5-47255, on / off limit switches are provided at the upper and lower ends of the window, and the position signal is reset by the switch signal.

[0005]

However, in any of the conventional upper and lower end position detecting means, the window mechanism has a backlash of the reduction gear, the presence of a rubber damper for cushioning, and an elastic body for sealing the window frame ( Since it consists of mechanical elements such as weatherstrip rubber), there is a positional deviation and elastic deformation, which vary depending on environmental conditions and are not constant. There is a problem of including it.
If the window position is recognized as displaced, it may be judged as a pinch and malfunction may occur even if it is at the top position. There is a possibility of malfunction. Alternatively, there is a possibility that the ascending motion will stop even if it is not completely closed.

Therefore, an object of the present invention is to provide a power window device capable of recognizing the upper and lower end positions without being affected by the position variation in consideration of an error which varies depending on environmental conditions and the like.

[0007]

In order to solve the above-mentioned problems, the structure of the present invention comprises a mechanism for raising and lowering a window glass by a motor, and in a power window control device for raising and lowering the window glass by a switch instruction. When the deceleration of the window glass exceeds a predetermined value at the upper end position and the lower end position of the glass, the power window control device has upper and lower end position determining means for determining the upper end or the lower end. It is to control the motor. Further, the configuration of the related invention has a safety means for detecting the upper end position, having a closed region based on the upper end position, and performing control for canceling the window trapping prevention control within the range of the region. Is.

According to the method of the present invention, in the control method of the power window control device for raising and lowering the window glass by the motor by the switch instruction, when the deceleration of the window glass exceeds a predetermined value, the power window control device is at the upper end. It is characterized in that it is determined to be a position or a lower end position, a predetermined distance from the upper end position is defined as a closed region, and the motor is controlled by the upper end position and the lower end position.

[0009]

Since the decelerations generated at the upper end position and the lower end position of the window take a relatively large value almost uniformly, the rotation speed is based on the pulse signal from the sensor that detects the rotation of the motor that drives the window. Then, the rotational speed change rate (deceleration) is obtained, and the value is determined. If the deceleration exceeds a predetermined value, it is determined that the upper end of the window glass is at the upper end position or the lower end position of the window. Based on the result, a closed-off area (upper end side) and an open-off area (lower end side) are set, and window control such as stopping the motor is performed. The control for the sandwiching control is released by such a closed / open region and the open / closed region so that the window glass is completely closed or opened.

[0010]

EFFECTS OF THE INVENTION The upper and lower ends of a window can be accurately recognized without installing a limit switch, and malfunctions due to misalignment of window control can be eliminated, reducing the closed area and open / closed area. Be peeled off.

[0011]

EXAMPLES The present invention will be described below based on specific examples. FIG. 1 shows a configuration of a power window system 1 mounted on a vehicle. In this example, a power window control circuit 11 (hereinafter, also simply referred to as a control circuit) configured by a microcomputer or the like is provided, and this control is performed. Command signals are input to the circuit 11 from the up (UP) command switch 12 and the down (DOWN) command switch 13 installed in the vehicle compartment.

A switching command is supplied from the control circuit 11 to the first relay switch 14 and the second relay switch 15 via the buffer amplifiers, respectively. The first and second relay switches 14 and 15 constitute a power supply circuit of a motor 16 for driving a power window, and the first and second relay switches 14 and 15 are shown in FIG.
In the state shown in (1), the battery power source (+ B) is connected to the motor 16 via the first relay switch 14, the motor 16 is connected to the ground circuit via the second relay switch 15, and the motor 16 is in the forward direction. It is driven to rotate and moves in the direction that the window opens.

Further, in response to a command from the control circuit 11, the first,
When the second relay switches 14 and 15 are switched from the state shown in FIG. 1, the polarity of the power source + B to the motor 16 is reversed and connected, the motor 16 is rotated in the reverse direction, and the window is driven in the closing direction.

The motor 16 is provided with, for example, a rotation detecting circuit 17 formed by using a Hall element or the like, and a pulse signal is generated from the rotation detecting circuit 17 in accordance with the rotation of the motor 16. Then, this rotation detection pulse signal is input to the control circuit 11, counted, and detected as a signal of the opening / closing position of the window. Further, the rotation speed of the motor 16 is calculated based on the pulse speed.

(Detection Operation of Upper and Lower Ends) When the window glass comes to the lower end, a sudden load is applied to the motor 16 at a place where the window glass is completely opened and cannot be lowered further, and the rotation shaft of the motor is suddenly increased. Stop. At that time, the pulse signal from the rotation detection circuit 17 is also stopped, and the controller 11 detects that the rotation has stopped.

When the window glass comes to the upper end, the motor 16 is suddenly loaded and the rotation of the motor is suddenly stopped at a place where the window glass is completely closed and cannot be further raised. Also in that case, the rotation detection circuit 1
The pulse signal from 7 stops. Taking the case of reaching the upper end, it is shown that the rotation speed change rate (deceleration), which is a feature of the present invention, is remarkable at the true upper end position.

First, FIG. 5 shows a schematic cross section of an upper end portion of a power window in which a trapping prevention measure is taken in a conventional system in which the lower end position and the upper end position are recognized by a rotation pulse. If entrapment measures are installed, this is the function of automatically reversing the glass rise when entrapment occurs in the normal area of window opening and closing. A weather strip 19 made of rubber or sponge is provided on the upper end of the window glass 18 to prevent water from entering from the outside. The weather strip 19 is provided with a groove into which the window glass 18 fits, and the bottom (upper end) of the groove is the upper end position of the window glass.

Therefore, a closing region is provided at the upper end position of the glass, and the reversing function is released in this region so that the closing operation is completely performed.
Due to the weather strip 19 being an elastic body and the elevating mechanism of the window glass 18, etc., the upper end position of the weather strip 19 is usually not constant because it changes depending on the strength with which the glass 18 hits and the environmental temperature.

FIG. 5 (a) shows the case where the closed region provided near the upper end is recognized as being displaced to the upper side due to the positional displacement caused by such various causes, whereby the glass 18 is recognized. In the case where the tip end of the sheet hits the lower end of the weather strip 19 and a load is generated, since it is not recognized as the closed area, it is determined that the place to be completely closed is the pinch, and the closed area may not be closed forever. On the contrary, FIG. 5B shows the case where the closed region is recognized as being shifted downward, and in this case, the upper end of the glass 18 is not reached the lower end of the weather strip 19, but it is determined to be the closed region. Therefore, even if something is caught, it will be forcibly closed.

Since such an operation occurs due to the shift of the upper end position, it does not occur if the recognition of the upper end position is more accurate for the power window control device 11. Then, the inventors solved this problem as follows.

As a phenomenon occurring at the upper end position, when the glass 18 hits the upper end, the rotation of the motor 16 is naturally stopped and the rotation signal pulse from the rotation detection circuit 17 is stopped. In this case, it was found that by calculating the rotational speed change rate at this position, the upper end position can be accurately detected regardless of the upper end position deviation. In other words, since the upper end position constantly changes, it is essential to detect the upper end position by an event that occurs at the upper end position, and the rate of change of the ascending speed of the window glass calculated from this rotation signal pulse (rotation speed change Rate), that is, the deceleration is used as a criterion for detecting the upper end position (upper and lower end position determining means).

In order to realize the above-described detection of the upper end (and lower end) position by the power window control device 11 shown in FIG. 1, its processing program will be described with reference to the flowchart shown in FIG. Fig. 2 (a) shows the result when the window is lowered.
(b) is a flowchart when the window is raised. The ascending time and the descending time are the same as the processing, only the instruction of the key switch 12 or 13 and the rotation direction of the motor 16 are different, and therefore, the case of ascending will be described. In the actual processing program, which switch is to be pressed is not decided, so step 21 of FIG. 2 (a) and step 31 of FIG. 2 (b), which are key switch judgments, should be expressed in the same flowchart. So, step 21 and step 31 are always checked alternately,
It is shown in two parts here for the sake of explanation.

When the up (UP) switch 12 is pressed,
When the (UP) signal is generated, it is determined in step 31 that the UP signal is present, and in step 32, a command for raising the window is output, and the motor 16 is rotated. The rotation pulse signal of the rotation sensor provided on the rotation shaft of the motor 16 is confirmed (step 33), this pulse signal is measured, the pulse period is calculated in step 34, and the rotation speed V is calculated in step 35, Based on the result, the rotation speed change rate ΔV / V is calculated in step 36. Then, in step 37, the value of the rotational speed change rate ΔV / V is checked, and if it is equal to or greater than a predetermined threshold value, it is determined that a large deceleration has occurred, and the time point is set as the upper end position, and the window driving motor 16 is stopped. .

Then, in step 37, the rotational speed change rate ΔV
If the value of / V is less than the threshold value, it is determined that the position is still to be raised, and the window raising process is continued. This iterative loop is actually performed in msec units,
The detection of the upper end position is detected with almost no difference from the time when the actual threshold value is generated, and an excessive load is not continuously applied to the motor 16.

FIG. 3 shows the rotational speed change rate (deceleration) near the upper end in correspondence with the vicinity of the glass upper end position. The weather strip 19 provided at the upper end position of the window is an elastic body mainly made of synthetic resin, and the glass 18 rises from the lower side and fits in the provided groove to hit the bottom portion of the groove and weather. The strip 19 is pressed and deformed to cause an excessive load on the motor for driving the glass 18, and the drive is cut off by the control to stop the glass 18 from rising. When this compression occurs, the rotational speed change rate (deceleration), which is a feature of the present invention
Occurs, the control for stopping the driving is performed by detecting the rate of change of the rotation speed.

When the window glass 18 rises from the lower side, the speed is almost constant and the rotational speed change rate follows a line of almost zero. Of course, since there are small load fluctuations, small changes are shown, and a noise-like waveform (n) that normally occurs is shown. When the upper end a of the window glass 18 reaches the lower end b of the weather strip 19, part of the glass such as the side surface of the glass 18 is exposed to the weather strip 1.
As the load contacts with 9, the load increases momentarily and slows down (d).
When reaching the bottom of the groove provided in 9, that is, the upper end position c of the window glass, the window glass 18 is pressed and pressed to generate a large rotational speed change rate (P). In the upper end position detection, the threshold value T in step 37 is set so as to detect this large rotation speed change rate.

Since the setting of the threshold value T differs depending on the vehicle, such as the shape and material of the weather strip and the difference in the motor used, there are conditions suitable for each.
It cannot indicate a specific value. However, the large rotational speed change rate that occurs at this upper end is sufficiently larger than the noise-like rotational speed change rate value at other positions, and since it only occurs at the upper end position, detection is easy and accurate. Is good. Even if the upper end position changes due to a change over time due to long-term use of the weather strip, the rotational speed change rate is always high at the upper end position, and correction is not necessary.

The weather strip 19 has different characteristics such as elastic force depending on the type of vehicle and the shape of the window.
The degree of this deformation also depends on the driving force of the type of the motor 16 that drives the window glass 18. Therefore, the upper end position of the window glass varies depending on the vehicle type. Further, even in the same car, the weather strip is made of synthetic resin and its elastic force changes depending on the difference in environmental temperature, so the deformation amount changes even if the pressure received from the glass is constant. Not only that, after long-term use, the elastic force also changes due to aging, and permanent deformation also occurs, so the upper end position constantly changes.

This rotation speed change rate can be detected by the power window control device 11 using the rotation signal pulse of the motor 16, which has been conventionally used for position detection. Therefore, the upper end position can be easily detected. The position can be detected accurately. The detection of the lower end position is the same as that of the upper end position detection, and the effects are the same.

With respect to the moving stroke of the window glass 18, it is necessary to match the actual stroke with the stroke recognized by the control device 11. Therefore, normally, when the control device 11 is operated immediately after being attached for the first time, initialization is performed. That is, when the control device 11 is initialized, the window glass 18 is opened to the lower end, the position is recognized as the lower end position, the window glass 18 is then closed to the upper end, and the position is recognized as the upper end position. Figure 4 (a) and (b)
The recognition stroke of the microcomputer shown on the left side and the recognition range at the time of initialization shown in the center are shown. And each figure (a)
, (B) shows the range recognized by the initialization in the center part.

Since the recognized upper and lower end positions change due to a physical factor, a deviation between the recognized position of the control device 11 and the actual situation occurs in the related art, and a phenomenon such as that the control device 11 is not completely closed during control occurs. There was a possibility to do. In the example of FIG. 4 (b) by the recognition of the rotation pulse of the conventional configuration, the reset position is recognized as displaced due to various factors, as shown on the right side. Therefore, in this conventional method, since the position counter is reset every time the window glass 18 reaches the lower end, even if an actual deviation occurs, it is always taken in and the stroke is not changed. Remains and does not recognize the correct top position.

On the other hand, in the method of the present invention as shown in FIG. 4 (a), it is detected that the signals at the upper and lower end positions are always generated in the vicinity of the position recognized at the initialization.
The actual deviation itself is recognized by the control device 11, and the control device 11 always grasps the actual position. Therefore, the phenomenon that the glass 18 is not completely closed does not occur under control.

Further, if the closed region is set by detecting the upper end position and the lower end position of the present invention, the deviation of the boundary as shown in FIG. 5 is suppressed as much as possible, and the power window control device having the entrapment control operates normally. Is guaranteed.

[Brief description of drawings]

FIG. 1 is a schematic block configuration diagram of a power window system to which the present invention is applied.

2 is an operation flowchart of the power window control device of FIG. 1 during a descending operation and an ascending operation.

FIG. 3 is an explanatory diagram of generation of a rotation speed change rate when a window glass is raised.

FIG. 4 is an explanatory diagram of recognition of an upper end and a lower end of a control device.

FIG. 5 is an explanatory diagram of a displacement occurring at an upper end position.

[Explanation of symbols]

 1 Power Window System 11 Power Window Control Circuit 12 Up (UP) Command Switch 13 Down (DOWN) Command Switch 14 First Relay Switch 15 Second Relay Switch 16 Motor 17 Rotation Detection Circuit 18 Window Glass 19 Weatherstrip

Claims (3)

[Claims] 1. A power window control device comprising a mechanism for raising and lowering a window glass by a motor, and raising and lowering the window glass by a switch instruction, wherein a deceleration of the window glass is predetermined at an upper end position and a lower end position of the window glass. A power window control device comprising upper and lower end position determination means for determining that the power window control device is at an upper end or a lower end when the value is exceeded, and controlling the motor according to the determination. 2. A safety means for detecting the upper end position, having a closed region based on the upper end position, and having control for canceling the window pinch prevention control within the region. The power window control device according to claim 1. 3. A control method of a power window control device for raising and lowering a window glass with a motor according to a switch instruction, when the deceleration of the window glass exceeds a predetermined value,
A power window control method characterized in that the power window control device determines that the position is an upper end position or a lower end position, a predetermined distance from the upper end position is a closed region, and the motor is controlled by the upper end position and the lower end position. .