JP2004116051A - Power window control - Google Patents

Abstract

An object of the present invention is to provide a power window control device that avoids excessive load from the start of operation.
The motor includes a motor that drives a window glass through a window regulator, and an encoder that converts a rotation angle of the motor into a pulse signal. Controlled.
By controlling the motor to rotate at a low current for a predetermined moving distance from the start of the raising operation of the window glass, the load can be reduced even when foreign matter is caught immediately after the start of the raising operation.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power window control device.
[0002]
[Prior art]
In the control of the opening and closing of a window provided in a vehicle, an encoder for converting the rotation angle of a motor for driving the window glass into a pulse signal is provided, and the opening and closing state of the window is detected by counting the pulse signals from the encoder. ing. Also, when closing the window, the size of the pulse interval at the time of driving is determined in order to detect that a foreign object is caught between the window glass and the window frame. When entrapment is detected, the driving direction of the window glass is reversed in order to limit the weight on the foreign matter. As an allowable value of the weight for the foreign matter in the vehicle, for example, the detection weight is 100 N or less.
[0003]
[Problems to be solved by the invention]
In the vehicle power window control method which has been studied so far, the above-mentioned allowable value is almost cleared, but the weight cannot be reduced and removed in the early stage of closing the window.
That is, as described above, the detection of the entrapment is performed based on the pulse interval when the window glass is driven. For example, it is necessary to compare the pulse interval with a pulse interval before a predetermined time to check the extension of the pulse interval. Therefore, when the entrapment is detected, the entrapment cannot be detected in the initial stage when there is no reference value to be compared. As a result, the detection of the entrapment is delayed, and a high weight is applied to the foreign matter.
[0004]
Further, in the early stage of closing the window, even if the reference value is substituted by a predetermined value, for example, the behavior of the window glass is unstable, so that the pulse interval largely fluctuates and the possibility of erroneous detection is high. In order to prevent this, the pulse interval of the predetermined value is set to be large. However, if this is done, the detection of entrapment is delayed, and the possibility of giving high weight is increased. Conventionally, since torque control of the motor at the start of operation is not performed, the pinching at the start of operation gives an excessive load to the foreign matter, in combination with the high starting torque characteristic of the DC motor.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a power window control device that avoids excessive load from the start of operation in order to solve the above problems.
[0006]
[Means for Solving the Problems]
Therefore, according to the present invention, in the power window in which the opening / closing body is driven by the motor based on the operation of the operation switch, the section of a predetermined distance from the drive start position in the closing direction of the opening / closing body is separated from the motor by another section. Was also configured to be driven at a low speed.
[0007]
【The invention's effect】
According to the present invention, by controlling the current of the motor so as to be at a constant distance and at a low speed immediately after driving the opening / closing body, it is possible to suppress the weight of foreign matter caught immediately after the start of the closing operation of the opening / closing body to a predetermined value or less.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described.
FIG. 1 shows an overall configuration of a power window control device according to an embodiment.
The power window control device drives the window glass by the motor 2 via a window regulator (not shown). The current circuit from the power supply 15 to the motor 2 is configured to be able to switch the current direction to the motor 2 via two relay switches 14 and open the current circuit. Further, a current control transistor (hereinafter abbreviated as current control Tr) 11 is arranged in series on the current circuit.
[0009]
The relay switch 14 has a solenoid 21 for ascending operation and a solenoid 22 for descending operation. (Hereinafter, abbreviated as Tr Tr) 13.
[0010]
The ascending operation Tr12 and the descending operation Tr13 are connected to the microcomputer 1 and are turned on and off by signals from the microcomputer 1.
An operation switch 6 for operating the power window and a position detector 5 for detecting a fully open position (lower end position) and a fully closed position (upper end position), which are terminal positions of the window glass, and generating a signal are connected to the microcomputer 1. ing.
Further, an encoder 4 attached to the motor 2 is connected to the microcomputer 1 and sends a rotation angle signal of the motor 2.
[0011]
The microcomputer 1 generates various internal operation signals for ascending operation, descending operation or their stop in response to signals from the operation switch 6 and the position detector 5. For example, in the case of ascending operation signal, a signal is sent to the ascending operation Tr12. In the case of the descending operation signal, a signal is sent to the descending operation Tr13, and the ascending operation Tr12 or the descending operation Tr13 is turned on while the ascending operation signal or the descending operation signal continues.
[0012]
The microcomputer 1 receives a pulse signal from the encoder 4 for detecting the rotation angle of the motor 2, counts the pulse absolute count value N ^* , and counts up when the window glass rises, when it counts up, and when it falls. Counts down.
The pulse absolute count value N ^* is set to be zero at the lower end position of the window glass. The microcomputer 1 detects the position of the window glass based on the pulse absolute count value N ^* , and controls the current of the motor 2 via the current control Tr11 according to the operation direction, the state of the auto mode or the manual mode, and the position of the window glass. It has become.
Therefore, the microcomputer 1 sends a PWM (pulse width modulation) control signal to the current control Tr 11 during the ascending operation and the descending operation to control the duty of the motor 2.
[0013]
When the microcomputer 1 receives the upper end position signal or the lower end position signal from the position detector 5 while raising or lowering the window glass, the microcomputer 1 determines that the window is fully closed or fully open, and raises the rising operation Tr12 or lowering operation Tr13. , The relay switch 14 is set to the neutral off state, at the same time, the output of the PWM signal to the current control Tr 11 is stopped, and the driving of the motor 2 is stopped.
[0014]
Further, the microcomputer 1 compares the pulse interval from the encoder 4 during the raising operation of the window glass with a predetermined reference value, and when the pulse interval exceeds the predetermined reference value, determines that the foreign matter is trapped. The lowering operation is performed, and finally the operation of the window glass is stopped.
[0015]
The operation switch 6 is, for example, a seesaw switch that is turned to one side with a fingertip when a descending operation is requested, and is turned to the other side when a rising operation is requested. When the operated position of the operation switch 6 is the "down" position or the "up" position at a shallow angle, the microcomputer 1 sends a down operation signal or an up operation to the angular position only while the operator is pushing the finger. A signal is generated. This state is called a manual mode. In the manual mode, when the operator releases the finger, the operation switch 6 returns to the neutral position by a spring force, and the operation signal in the microcomputer 1 stops.
[0016]
On the other hand, if the operation switch 6 is once operated to the "auto mode down" or "auto mode up" position at a large angle, even if the finger is released and the operation switch 6 returns to the neutral position by spring force, the microcomputer 1 The flag of the descending operation or the rising operation corresponding to the operation is set. This state is called an auto mode.
[0017]
In the automatic mode, the microcomputer 1 operates until the window glass moves and the position detector 5 issues a lower end position signal or an upper end position signal to the microcomputer 1 or the pulse absolute count value N ^* becomes a corresponding value. Holds the operation flag. When receiving the lower end position signal or the upper end position signal (or detecting the corresponding pulse absolute count value N ^* ), the microcomputer 1 resets the flag of the operation and stops the operation.
Further, when the operation switch 6 is operated to the manual position of the operation in the opposite direction to the operation direction during the operation in the auto mode, the microcomputer 1 detects the operation, and the down operation or the up operation which is an internal signal of the operation in the auto mode. Reset the operation flag and stop the operation.
[0018]
The ascending operation Tr12 is turned on by a signal from the microcomputer 1, the solenoid 21 of the relay switch 14 connected to the ascending operation Tr12 is turned on, and the electric circuit to the motor 2 is turned on.
The descending operation Tr13 is turned on by a signal from the microcomputer 1, the solenoid 22 of the relay switch 14 connected to the descending operation Tr13 is turned on, and the electric circuit to the motor 2 is turned on.
[0019]
2 to 7 are flowcharts showing the flow of current control and pinch prevention at the time of opening and closing the window glass in the above configuration.
These operations operate according to signals from the encoder 4, the position detector 5, and the operation switch 6 as a program of the microcomputer 1.
[0020]
In step 101, the microcomputer 1 detects whether the operation direction of the operation switch 6 is an ascending operation, that is, a closing operation, or a descending operation, that is, an opening operation. The process proceeds to step 102 in the case of a rising operation, and proceeds to step 201 in the case of a descending operation.
In step 102, it is determined whether or not the ascending operation is in the auto mode. In the case of the auto mode, the process proceeds to step 103, and in the case of not the auto mode, that is, in the case of the manual mode, the process proceeds to step 151.
[0021]
In step 103, since the operation is in the ascending operation auto mode in this case, a flag for continuing the ascending operation is set.
In step 104, the absolute pulse count N ^* ₀ of the encoder before the start of the ascent operation at the current position of the window glass is stored.
In step 105, the duty ratio of the current control Tr11 is set to a small value, for example, 50%, so that the motor 2 has a low rotational speed at the beginning of the ascending operation.
[0022]
In step 106, the ascending operation Tr12 is turned on, the solenoid 21 of the relay switch 14 is energized, and the power supply circuit of the motor 2 is set to a circuit in the direction of the ascending operation.
After step 106, the process proceeds to step 107.
In step 107, the PWM signal having the duty ratio set in step 105 is output to the current control Tr11 to control the motor 2 at a low current.
FIG. 8 shows a voltage pulse signal that the microcomputer 1 outputs to the current control Tr11 for PWM control. Assuming that Ns is the pulse count corresponding to the initial movement of the ascending operation, for example, the window glass movement amount of 10 mm, the pulse absolute count value N ^* is output with the duty ratio set to 50% during the period of N ^* <Ns + N ^* ₀ .
[0023]
In Step 108, the position detector 5 detects that the pulse absolute count value N ^* is _{equal to} or greater than _NUL corresponding to the fully closed position, or the window glass has reached the upper end position, and sends an upper end position signal to the microcomputer 1. Determine if you are calling. If any of the conditions is satisfied, the process proceeds to step 117. If none of the conditions is satisfied, the process proceeds to step 109.
[0024]
In step 109, the pulse signal from the encoder 4 accompanying the rotation of the motor 2 is received, and the pulse integration calculation of the pulse absolute count value N ^* corresponding to the position of the upper end of the window glass is performed.
In step 110, the time interval Tpl at which the pulse addition is performed in step 109 is measured.
In step 111, the measurement result of the pulse interval in step 110 is determined, and it is determined whether Tpl is shorter than a predetermined interval Tmax. If the condition is satisfied, the process proceeds to step 112; otherwise, the process proceeds to step 120.
[0025]
In step 112, it is determined that the movement of the window glass by the predetermined distance is completed at the beginning of the ascent operation. If N ^* ≧ Ns + N ^* ₀ , that is, if the pulse absolute count value N ^* has been accumulated over the number of steps Ns corresponding to a predetermined distance, for example, 10 mm, the process proceeds to step 113. If not reached, the process proceeds to step 114.
In step 113, after the window glass has completed the low-current operation at a distance of 10 mm in the initial stage of the ascent operation, the duty ratio of the current control Tr11 is set to 100% when the window glass enters the region of N ^* ≧ Ns + N ^* ₀ as shown in FIG. Set to.
After step 113, the process proceeds to step 114.
[0026]
In step 114, it is determined whether or not the current position of the upper end of the window glass is in an area corresponding to N1 ≦ N ^* <N2 in the pulse absolute count value N ^* .
Where N1 is the pulse absolute count minus only pulse count corresponding pulse absolute count N _UL corresponding to the fully closed position of the window glass, for example window glass moving distance 20 mm, N2 is likewise for example wind from N _UL It is a pulse absolute count value obtained by subtracting a pulse count corresponding to a glass movement distance of 7 mm.
[0027]
In this area determination, in the auto mode, the ascending operation is performed at a low speed so as not to pinch a finger or the like between the upper end of the window glass and the window frame. This is to prevent weighting.
If this determination condition is met, the process proceeds to step 115. If there is no upper end of the window glass in this area, the process proceeds to step 116.
In step 115, the duty ratio of the current control Tr11 is set to, for example, 50% of the low current setting. After step 115, the process proceeds to step 116.
[0028]
In step 116, it is checked whether the ascending operation FLAG = 0, that is, whether or not the operation switch 6 has stopped the auto mode ascending operation.
If the ascending operation FLAG = 0, the process proceeds to step 117; otherwise, the process returns to step 107.
In step 117, the output of the signal to the rising operation Tr12 and the output of the PWM signal to the current control Tr11 are stopped. As a result, the solenoid 21 of the relay switch 14 is turned off, and the relay switch 14 opens the current circuit of the motor 2. That is, the motor 2 stops.
[0029]
In step 120, the signal to the rising operation Tr12 and the output of the PWM signal to the current control Tr11 are stopped. This means that in step 111, the reason why the pulse interval is longer than the predetermined time is determined to be foreign matter trapping, and first, the rising of the window glass is stopped.
In step 121, the flag for continuing the rising operation is reset.
In step 122, a flag is set to continue the descending operation.
[0030]
In step 123, N ^* -Nd, which is smaller than the pulse absolute count value N ^* being the current position by a predetermined amount, for example, by the number of steps Nd corresponding to 150 mm, is set as the target value N ^* _t of the pulse absolute count value. When N ^* -Nd is negative, the absolute pulse count value 0 corresponding to the fully open state is set as the target N ^* _t .
[0031]
In step 124, the duty ratio of the current control Tr11 is set to 100%.
In step 125, the descending operation Tr13 is turned on, and the power supply circuit of the motor 2 is switched to the descending operation side.
After step 125, the process proceeds to step 126.
In step 126, a PWM signal having a duty ratio of 100% is output to the current control Tr11.
In step 127, the pulse signals from the encoder 4 are counted, and the current pulse absolute count value N ^* is obtained.
[0032]
In step 128, when the current pulse absolute count value N ^* is equal to or less than _NLL corresponding to full open, or when the lower end position signal is obtained from the position detector 5, the process proceeds to step 130. If not, the process proceeds to step 129.
In step 129, the current pulse absolute count ^{N *} to determine whether the following target ^N _{* t,} if the target ^N _{* t} not less returns to step 126 after step 129. If it is equal to or less than the target N ^* _t , the process proceeds to step 130.
[0033]
In step 130, the flag for continuing the descending operation is reset.
In step 131, the signal to the descending operation Tr13 is stopped, and at the same time, the output of the PWM signal to the current control Tr11 is stopped. As a result, the relay switch 14 opens the current circuit to the motor 2, and the motor 2 stops.
[0034]
As described above, a series of flows of the ascending operation in the auto mode has been described. The speed control of the motor 2 will be described with reference to FIG.
The ascending operation of the window glass according to the present embodiment is shown with the horizontal axis as the position of the upper end of the window glass and the vertical axis as a percentage of the driving speed of the window glass as a result of current control.
During a predetermined distance of 10 mm from the ascending operation start position, the motor 2 is controlled at a 50% duty ratio, so that the speed is suppressed to 40%, and after that, the duty ratio becomes 100% and the speed becomes 100%.
In the case of the auto mode, since the motor 2 is controlled at a duty ratio of 50% in a section 20 mm below the upper end to 7 mm below the upper end, the speed is suppressed to 40%.
[0035]
FIG. 5 shows steps 151 to 161 in the case of the ascending operation in the manual mode.
In step 151, since the operation is the manual mode raising operation in this case, the raising operation signal is generated inside the microcomputer 1 only during the operation of the operation switch 6.
In step 152, the absolute pulse count value N ^* ₀ of the encoder before the start of the ascent operation at the current position of the window glass is stored.
In step 153, the duty ratio of the current control Tr11 is set to a small value such as, for example, 50% in order to reduce the speed of the motor 2 at the beginning of the ascending operation.
[0036]
In step 154, the ascending operation Tr12 is turned on, the solenoid 21 of the relay switch 14 is turned on, and the power supply circuit of the motor 2 is set to a circuit in the direction of the ascending operation.
After step 154, the process proceeds to step 155.
In step 155, a PWM signal having the duty ratio set in step 153 is output to the current control Tr11 to control the motor 2 at a low current.
The pulse absolute count value N ^* is controlled in a section of N ^* <Ns + N ^* _{0 at} a duty ratio of 50% as in the case of the auto mode raising operation.
[0037]
In step 156, the position detector 5 detects that the pulse absolute count value N ^* is _{equal to} or greater than _NUL corresponding to the fully closed position, or the window glass has reached the upper end position, and sends an upper end position signal to the microcomputer 1. Determine if you are calling. If any of the conditions is satisfied, the process proceeds to step 161. If none of the conditions is satisfied, the process proceeds to step 157.
[0038]
In step 157, the pulse signal from the encoder 4 accompanying the rotation of the motor 2 is received, and the pulse integration calculation of the pulse absolute count value N ^* corresponding to the position of the upper end of the window glass is performed.
In step 158, it is determined that the movement of the window glass by the predetermined distance is completed at the beginning of the raising operation. If N ^* ≧ Ns + N ^* ₀ , that is, if the pulse absolute count value N ^* has been accumulated over the number of steps Ns corresponding to a predetermined distance, for example, 10 mm, the process proceeds to step 159. If not reached, the process proceeds to step 160.
[0039]
In step 159, after the window glass has completed the low-current operation for a distance of 10 mm at the beginning of the raising operation, and enters the region of N ^* ≧ Ns + N ^* ₀ as in the case of the auto-mode raising operation, the duty ratio of the current control Tr11 is changed. Is set to 100%.
After step 159, the process proceeds to step 160.
[0040]
In step 160, it is checked whether or not the ascending operation signal is generated in the microcomputer 1, and it is determined whether or not the operation switch 6 is continuously pressed.
If the operation switch 6 is kept pressed, the process returns to step 155. If the operation switch 6 has not been pressed, the process proceeds to step 161.
[0041]
In step 161, the output of the signal to the rising operation Tr12 and the output of the PWM signal to the current control Tr11 are stopped. As a result, the solenoid 21 of the relay switch 14 is turned off, and the relay switch 14 opens the current circuit of the motor 2. That is, the motor 2 stops.
[0042]
FIG. 6 shows the part of the auto mode lowering operation of the flowchart from step 201 to step 209.
Steps 201, 202, and 204 to 209 in FIG. 6 have different operation directions, but correspond to steps 102, 103, 106 to 109, 116, and 117 in FIGS.
The difference between the lowering operation in the auto mode and the raising operation in the same mode is that in the lowering operation, only the PWM control corresponding to the 100% duty ratio of the high current is performed. The current control is not performed in the region of the pulse absolute count value N ^* in a certain distance after the start of the operation and immediately before the window glass is completely closed, as in the case of the rising operation, and no entrapment detection is performed.
[0043]
FIG. 7 shows a step 221 to step 228 of the manual mode descending operation of the flowchart.
Steps 221, 223 to 228 in FIG. 7 correspond to steps 151, 154 to 157, 160, and 161 in FIG.
The difference between the descending operation in the manual mode and the ascending operation in the same mode is that in the descending operation, only the PWM control corresponding to the 100% duty ratio of the high current is performed. The point is that the current control is not performed in the area of the pulse absolute count value N ^* at a certain distance after the start of the operation as in the case of the rising operation.
[0044]
Step 105, 107, 113, 115, 124, 126, step 153, 155, 159, step 203, 205, step 222, and 224 constitute a current control means. I do.
[0045]
This embodiment is configured as described above, and controls the motor so that the first predetermined distance window glass at the time of the ascent operation is at a low rotation speed until the movement operation is completed. Also in the case of (1), the force applied to the foreign matter can be reduced, and it is easy to avoid when the foreign matter is likely to be caught or escape from the caught.
[0046]
In particular, immediately after the start of the ascent operation, the rotation of the motor is not uniform due to the play of the power window regulator and the large friction between the window glass and the weather strip. difficult.
On the other hand, according to the present embodiment, for example, when the window glass is raised in either the automatic mode or the manual mode, a foreign object is trapped immediately after the raising operation, the rotation speed of the motor 2 is reduced, and the reverse rotation operation starts. Even if the time is short, the force applied to the foreign matter can be reduced despite the high starting torque characteristics of the DC motor.
[0047]
In addition, when the position of the window glass in the ascending operation in the auto mode is near the upper portion of the window frame, a low-current motor control is used, so that the load can be reduced even when a foreign object such as a finger is pinched.
In addition, when the motor reaches the upper end of the window frame, motor control with high current is performed up to the upper end of the fully closed position, so it overcomes the resistance of the wind sash glass seal and the friction of the wind glass to the completely closed position. It operates and can secure the tightness of the window.
[0048]
Further, in the auto mode ascending operation, a pulse time interval from the encoder is measured, and if longer than a predetermined pulse time interval, it is determined that a foreign object is caught. Therefore, even when the foreign matter is pinched, the load on the foreign matter does not continue.
[0049]
In the configuration of the power window control device of the present embodiment, an example of a current switching circuit using a relay switch has been described. However, the present invention is not limited to this. As a bridge circuit using four transistors, a PWM A configuration for inputting a signal may be used.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a power window control device according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a flow of power window control.
FIG. 3 is a flowchart showing a flow of power window control.
FIG. 4 is a flowchart showing a flow of power window control.
FIG. 5 is a flowchart showing a flow of power window control.
FIG. 6 is a flowchart showing a flow of power window control.
FIG. 7 is a flowchart showing a flow of power window control.
FIG. 8 is a diagram illustrating control of a motor current.
FIG. 9 is a diagram illustrating driving of a window glass according to the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 microcomputer 2 motor 4 encoder 5 position detector 6 operation switch 11 current control transistor 12 ascending operation transistor 13 ascending operation transistor 14 relay switch 15 power supply 21 ascending operation solenoid 22 ascending operation solenoid

Claims (5)

In a power window in which an opening / closing body is driven by a motor based on an operation of an operation switch,
A power window control device, wherein the motor is driven at a lower speed in a section at a predetermined distance from a drive start position in the closing direction of the opening / closing body than in other sections. In a power window in which an opening / closing body is driven by a motor based on an operation of an operation switch,
A power section configured to drive the motor at a lower speed than other sections in a section at a predetermined distance from a drive start position in the closing direction of the opening / closing body and a section at a predetermined distance immediately before the fully closed position. Wind control device. A manual mode in which the motor is driven only while the operation switch is operated, and an auto mode in which the open / close body can be continuously driven from the current position to the end position once the operation switch is operated,
3. The power window control device according to claim 2, wherein the low-speed driving of the motor is performed in an automatic mode and not performed in a manual mode. 4. The power window control device according to claim 1, wherein the motor is driven by a current control unit that performs PWM control, and the current is controlled to a low speed by the low current control. 5. 5. The motor according to claim 1, wherein the motor is provided with an encoder that converts a rotation angle of the motor into a pulse signal, and counts the pulse signal to detect a position of the opening / closing body. A control device for a power window according to claim 1.

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