JPH0762947A - Power window control device - Google Patents

Abstract

PURPOSE:To accurately detect the position of a window glass and control the ascent/descent position by resetting the count value of the output pulses of a pulse generator to the initial value each time the window glass is detected to reach a reference position certain times. CONSTITUTION:When a, power window action switch 16 is operated, a CPU 30 drives a motor 12 to lift or lower a window glass. When the window glass reaches a reference position, e.g. the fully closed position, during the ascent/ descent, the CPU 30 detects it. When the CPU 30 detects that the window glass reaches the fully closed position certain times, it updates the count value of the output pulses of a pulse generator 14 to the initial value. The error of the count value generated during operation is canceled each time the count value is updated to the initial value before a large error is generated in the count value by the chattering output of the pulse generator 14 when a motor 12 is stopped or by the integration of the pulse outputs in the opposite direction generated in excess when the reverse rotation of the motor 12 is started after it is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power window control device, and more particularly, to a window glass position based on the output of a pulse generator that generates a number of pulses proportional to the number of rotations of the motor in the forward and reverse directions. The present invention relates to a power window control device that controls the vertical position of a window glass while calculating

[0002]

2. Description of the Related Art As a power window control device, the number of rotations of a motor for driving up and down a window glass is detected, and a foreign substance is caught from the rate of change of the number of rotations due to a decrease in the number of rotations of the motor while the window glass is rising. However, there is known a power window control device having a trapping prevention function of controlling the motor so as to stop the movement of the window glass and lower it by a predetermined amount when foreign matter trapping is detected.

In a power window control device having such a pinching prevention function, magnets (magnetic poles) having different polarities are magnetized at predetermined intervals on an armature, which is a motor rotating shaft, to change magnetic field caused by rotation of the armature. A pulse generator that picks up a Hall IC is generally configured. Then, the number of pulses in the forward and reverse directions output from the pulse generator as the motor rotates when the window glass is moved up and down is counted by the pulse counter, and the count value of the pulse counter is stored in the memory in advance using a microcomputer. The position of the window glass is calculated by adding or subtracting the count value (pulse value) corresponding to the reference position.

In this type of power window control device,
As shown in FIG. 5, the length x of the groove portion of the weatherstrip rubber 50 and a predetermined dimension y of the lower portion (this dimension is
X + y (≦ 4 mm or less) must be added to the weather strip rubber 50 and the window glass 52 so that a finger or the like cannot be inserted between them.
There is one in which an entrapment prevention release area in which the foreign substance entrapment prevention operation of x + 4) mm is not performed is set. When the window glass 52 hits the inner bottom wall 50A of the weather strip rubber 50 (provided for soundproofing and waterproofing) while the window glass 52 is rising, the rate of change of the motor rotation speed changes similarly to when foreign matter is caught. Therefore, it is necessary to stop the window glass 52 by lowering it by a predetermined amount (for example, 10 cm) when it is determined that the foreign matter is caught, while there is almost no possibility of the foreign matter being caught in the area where the foreign matter is prevented from being caught. This is because there is no inconvenience even if the foreign matter trapping detection function is canceled (except for trapping).

[0005]

When the motor operation is started,
As shown in FIG. 7A, the output of the pulse generator is
The pulse width is wide, and the pulse width gradually decreases as the motor rotation speed increases. On the other hand, when the Hall element is in the middle position of the magnetic poles magnetized on the armature surface when the motor is stopped (hereinafter, "the armature is near the magnetic field threshold"), as shown in FIG. 7B. The chattering output (see arrow A in the figure) may occur. Further, even when the overload is stopped [the motor is locked when the upper end surface of the window glass 52 abuts on the inner bottom wall 50A of the weather strip rubber 50 (when the window glass is fully closed), the armature is exposed to the magnetic field. If it is near the threshold, an additional pulse in the reverse rotation direction may be generated when the load is released (when the motor reverse rotation is started) [arrow B in FIG. 7 (c)].
reference〕.

However, according to the pulse generator using the Hall element, the rotational position of the motor and thus the position of the object driven by the motor can be detected without depending on the rotational speed of the armature, that is, the pulse width ( Since it is possible to detect even at zero speed), there is a possibility that pulse counting error may occur due to the above-mentioned extra generation of chattering output and reverse rotation pulse. Due to this counting error, if it is judged that the window glass is not at the fully closed position in reality, but when the window glass 52 descends and then rises again, the jamming prevention release area is not reached but the jamming prevention area is not reached. As a result of not performing the foreign matter entrapment prevention operation by determining the prevention release area, the foreign matter is entrapped, or the foreign matter is actually caught at the position of the weatherstrip rubber 50, but the foreign matter entrapment is determined and the position of the weatherstrip rubber 50 is determined. Therefore, there is a fear that the motor may perform an unexpected operation of reversing after stopping.

In addition, as shown in FIG. 6, even when the inner bottom wall 50A of the weatherstrip rubber (see the hatched portion in the figure) is damaged, the stop position of the window glass when fully closed is indicated by reference numeral 52B in the figure. There was a case where it was displaced upward from the normal position indicated by (see reference numeral 52A in the figure). On the other hand, when the window glass rises due to a drop in the motor power supply voltage, hardening of the weatherstrip rubber 50 at low temperatures, pinching of small foreign objects, catching due to rattling of the regulator, etc. Therefore, when the window glass 52 descends and rises again after that, there is a possibility that foreign matter is caught in the pinch prevention release area even though it has not reached the pinch prevention release area. There was a risk that it would be high.

The present invention has been made in view of the above facts, and an object thereof is to provide a power window control device capable of accurately detecting the position of a window glass and controlling the elevation position. .

[0009]

According to a first aspect of the present invention, there is provided a power window control device including a motor for driving window glass up and down.
A pulse generator that generates a number of pulses that is proportional to the number of rotations of the motor in the forward / reverse direction, a detection unit that detects when the window glass reaches a reference position, and an output pulse of the pulse generator. A position detection unit that counts and detects the position of the window glass based on the count value and an initial value that is predetermined corresponding to the reference position, and a position detected by the position detection unit and an external command. Control means for controlling the motor accordingly, initial value resetting means for resetting the count value to the initial value each time the detecting means detects that the window glass reaches a certain number of reference positions, Have.

According to another aspect of the power window control device of the present invention, there is provided a motor for driving the window glass up and down, and a positive / negative motor for the motor.
A pulse generator that generates a number of pulses that is proportional to the number of revolutions in the reverse direction, a detection unit that detects when the window glass reaches a reference position, and an output pulse of the pulse generator that counts this count. Position detection means for detecting the position of the window glass based on a value and a predetermined initial value corresponding to the reference position, and the motor in accordance with the position detected by the position detection means and an external command. Every time the control means for controlling and the detection means detect that the window glass reaches the reference position, the count value when the window glass reaches the reference position this time and the count value when the window glass reaches the reference position last time And a reference count value updating means for updating the current count value to the previous count value when the difference exceeds the predetermined value.

[0011]

According to the power window control device of the first aspect, when the control means drives the motor in response to the external command, the window glass moves up and down. When the window glass reaches the reference position during the ascending / descending, the detecting means detects it. When the detecting means detects that the window glass has reached the reference position a certain number of times, the initial value resetting means updates the count value to the initial value. As a result, every time the window glass reaches the reference position, the count value, which is the reference for detecting the position of the window glass, is updated to the initial value. Even if the error occurs, the error of the count value generated during the movement is reset each time it is reset to the initial value, the window position is detected with high accuracy by the position detecting means, and this is detected. The motor is controlled by the control means based on the position. As a result, the vertical position control of the window glass is accurately performed.

The reference position may be, for example, a fully closed position or a fully open position of the window glass. However, when the window glass is opened, the position is not always fully opened.
Considering that the window glass is normally fully closed when the air conditioner is used, it is preferable to set the window glass fully closed position as the reference position.

The detecting means for detecting the fully closed position as a reference position may be a fully closed sensor,
Alternatively, it may be a means for detecting the fully closed position based on the detected pulse value and the rate of change of the motor rotation speed.

The power window control device using the fully closed position of the window glass as a reference position includes a power having a pinching prevention function in which a pinching prevention release area is set over a predetermined range from the fully closed position of the window glass. Although there is a window control device, when the present invention is applied to such a power window control device, the chattering output of the pulse generator at the time of stopping the motor and the reverse rotation direction pulse additionally generated at the time of starting the reverse rotation after the motor is stopped. While the error of the detected pulse value does not greatly occur due to the integration of the output, the initial pulse value is reset at the actual closed position of the window glass.
It is possible to reliably detect the pinch prevention release area.

Further, as other window glass position control, for example, control for surely raising and lowering the window glass at an arbitrary position, a window glass at the fully closed position without providing a fully closed sensor or the like is provided. Although a control for surely stopping is conceivable, even in such a case, according to the present invention, the elevation position control of the window glass can be surely performed.

According to the power window control device of the second aspect, when the control means drives the motor in response to the external command, the window glass moves up and down. When the window glass reaches the reference position during the ascending / descending, the detecting means detects it. When the detection means detects that the window glass has reached the reference position, the reference count value updating means detects the count value when the window glass reaches the reference position this time and the previous count when the window glass reaches the reference position. The difference from the count value of is calculated, and if the difference exceeds a predetermined value, the count value of this time is updated to the count value of the previous time. As a result, when the deviation of the count value when the window glass reaches the reference position exceeds the predetermined value, the count value is updated so that the deviation is within the predetermined value, and the error in detecting the position of the window glass Can be stopped within a predetermined value, and by presetting the allowable value of this deviation within a range that does not actually hinder, it is possible to accurately perform the position detection of the window glass and the elevation position control with sufficient accuracy.

Therefore, when the present invention is applied to a power window control device having a pinch prevention function in which the pinch prevention release area is set, the chattering output of the pulse generator when the motor is stopped or the reverse rotation after the motor is stopped. Not only the error in counting the pulse value due to the integration of the reverse rotation direction pulse output that was additionally generated at the start, but also when the motor power supply voltage suddenly dropped during use or a small foreign object was trapped (occurs in the dead zone). Even if the window glass stops at an intermediate position due to such reasons, the subsequent position detection and elevation control of the window glass can be performed with high accuracy.

[0018]

【Example】

[First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 5.

FIG. 1 schematically shows the structure of a power window control device 10 according to the first embodiment. In this power window control device 10, as shown in FIG. 5, a window glass 5 defined by an inner bottom wall 50A of a weatherstrip rubber 50 provided on a window frame (not shown).
An entrapment prevention release area in which the entrapment prevention operation is not performed is set within a range of x + y (≦ x + 4) mm from the fully closed position of 2.

The power window control device 10 includes a motor 12 for raising and lowering a window glass 52, and the motor 1.
The pulse generator 14 that generates a number of pulses proportional to the number of rotations in the forward / reverse rotation direction of 2, and the control described later based on the number of output pulses from this pulse generator 14 and the input from the power window operation switch 16 described later. It has a microcomputer (hereinafter abbreviated as “microcomputer”) 18 that controls the motor 12 via a motor driver 32 according to an algorithm or the like.

The pulse generator 14 is a motor 1
The magnets (magnetic poles) having different polarities are magnetized at predetermined intervals on the armature (not shown) that is the rotating shaft of the second motor, and the change in the magnetic field caused by the rotation of the armature is picked up by a hall element (hall IC) (not shown) to drive the motor. A well-known structure for generating a number of pulses proportional to the number of rotations in the forward and reverse directions of 12 is used. The pulse generator 14 generates two types of pulses that are 90 degrees out of phase, and the forward / reverse direction of the motor 12 can be determined depending on which of these pulses rises first.

The power window operation switch 16 can be pressed in two steps in the ascending direction and the descending direction. When the power window operating switch 16 is lightly pressed in the ascending direction, a manual raising command for raising the window glass 52 only while it is being pressed. Is output, and the window glass 52 keeps rising when it is strongly pressed in the ascending direction, and the manual descending command for descending the window glass 52 is output when it is lightly pressed in the descending direction. However, it is an external input means for outputting an automatic descending command in which the window glass 52 continues to descend when strongly pressed in the descending direction.

The microcomputer 18 includes an input port 20 and an RO
M (read only memory) 22, RAM (random access memory) 24, output port 26, and CPU connected to these via a system bus 28
(Central processing unit) 30 and the like are included.

In the ROM 22, control algorithms and the like corresponding to the flow charts described later are stored in advance. In the RAM 24, a first area in which a count value of a counter (not shown) described later is sequentially stored, the CPU 30
Are provided with various areas such as a second area as a work area for performing various processes.

Next, the operation of the first embodiment configured as described above will be described with reference to the flowchart of the main routine of FIG. 2 showing the main control algorithm of the CPU 30.

This main routine starts with
This is the case where the operator operates the power window operation switch 16 and issues an automatic raising command to the CPU 30.

First, in step 100, a motor forward drive command is output to the motor driver 32 via the output port 26 to drive the motor 12.

In the next step 102, the count value of a counter (not shown) is fetched, and in step 104 the count value is stored in the second area of the RAM 24. Here, the counter operates in the interrupt routine shown in the flowchart of FIG. 3 when the window glass rises, and when the output pulse from the pulse generator 14 is input through the input port 20, the rising edge of this pulse is detected. This interrupt processing is performed at a timing, and the counted up values are sequentially stored in the first area of the RAM 24. An initial value n ₀ corresponding to the window glass fully closed position as a reference position is preset in this counter. Therefore, in steps 102 and 104,
This means that the CPU 30 once fetches the count value at that time stored in the first area of the RAM 24 and stores the fetched count value in the second area of the RAM 24.

This counter is counted down by an interrupt routine when the window glass is descending.

At the next step 106, R at step 104
The difference between the stored the current count value n _i and the previous count value n _i-1 to the second area of _{AM24 (n i -n i-1} )
Is calculated to calculate the change rate R _n of the rotation speed of the motor. Since this main routine performs one cycle of processing at substantially constant time intervals based on the clock timing, the difference in count value is proportional to the rate of change in the number of rotations of the motor, and for convenience, R _n = (n _i −n _{i- 1} ) Can be treated as

In the next step 108, it is determined whether or not the rate of change R _n is less than or equal to a predetermined value, and if the determination in step 108 is negative, the process returns to step 102 and the above-described processing / determination is repeated. When the determination in step 108 is affirmative, the window glass 52 has come into contact with some foreign matter during the ascent, or the window glass has come up to the fully closed position and has come into contact with the inner bottom wall 50A of the weatherstrip rubber 50. Therefore, the process proceeds to step 110, and it is determined whether or not the position of the window glass 52 is in the above-mentioned entrapment prevention release area based on the present count value stored in the second area in the RAM 24 in step 104. judge.

If the determination in step 110 is affirmative, it can be determined that the window glass 52 is in the fully closed position, so the process proceeds to step 114 and the motor is immediately stopped. As a result, the window glass 52 is stopped at (the position determined to be) the fully closed position.

In the next step 116, the count value of the counter is reset to the initial value and then the control ends. In addition,
In order to detect this fully closed position more accurately, other detection means such as a fully closed sensor may be installed.

On the other hand, if the determination in step 110 is negative, it is considered that the window glass 52 has come into contact with some foreign matter, so the routine proceeds to step 112, and the trapping prevention processing is performed. This trapping prevention processing is specifically performed by controlling the motor 12 so that the window glass 52 is stopped at that position and then lowered by a predetermined amount and stopped. The control is terminated after the entrapment prevention process is completed.

As is apparent from the above description, in the first embodiment, the CPU 30 in the microcomputer 18 is the ROM 2
By operating according to the control algorithm stored in 2, it functions as a detection unit, a position detection unit, a control unit, and an initial value resetting unit.

Besides, the power window operation switch 1
6 is operated, the automatic descending command, the manual ascending command,
When the manual descending command is input, the CPU 30
Then, the motor is controlled according to the command, but the control method in these cases is publicly known, and therefore the description thereof is omitted here.

As described above, according to the first embodiment, the count value of the counter is reset (reset) to the initial value every time the window glass 52 is stopped at the fully closed position. The resetting of the initial value before the chattering output of the pulse generator 14 at the time of stop and the addition of the reverse rotation direction pulse output additionally generated at the time of starting the reverse rotation after the motor 12 is stopped do not cause a large error in the count value. Each time, the error of the count value generated during operation is canceled, and the window glass 52 based on the count value by the CPU 30 is canceled.
Position detection and the vertical position control of the window glass 52 are accurately performed. Therefore, it is possible to improve the reliability of the detection / release of the foreign matter entrapment and the window glass up / down control.

In the first embodiment, the window glass 52
The case where the count value of the counter is reset to the initial value each time the vehicle stops at the fully closed position is illustrated.
When 2 stops at the fully closed position, the Kauite value may be reset to the initial value once every several times.

Further, in the above embodiment, the rate of change R of the rotational speed is
After determining whether _n has become equal to or less than a predetermined value (step 108), it is determined whether or not it is the entrapment prevention release area (step 110). If it is not the entrapment prevention release area, entrapment prevention processing is performed, and entrapment is performed. If it is in the prevention release area, it is assumed that the window glass 52 is in the fully closed position.
Although the case of immediately stopping is illustrated, whether or not the rate of change R _{n of the} number of revolutions has become equal to or less than a predetermined value only in the case where it is not the post-entrapment prevention release region after the determination as to whether it is the entrapment prevention release region is performed first. May be determined.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIG.

Since the structure of the hardware portion of the second embodiment is the same as that of the first embodiment described above, the description thereof will be omitted and the second embodiment will be omitted.
The operation of the embodiment will be described with reference to the flowchart of the main routine of FIG. 4 showing the main control algorithm of the CPU 30.

This main routine starts
This is the case where the operator operates the power window operation switch 16 and issues an automatic raising command to the CPU 30.

After the start, step 200 to step 2
Up to 08, steps 100 to 1 of the first embodiment
The same processing determination as 08 is made.

If the determination in step 208 is affirmative, the process proceeds to step 210, and in step 204 the RAM 2
Based on the count value stored in the second area No. 4, it is determined whether or not the window glass is in the above-mentioned pinch prevention release area.

If the determination in step 210 is affirmative, the routine proceeds to step 214, where the motor 12 is immediately stopped, and in step 216, the difference (n) between the current count value n _i and the previous count value n _{i-1. i−} n _i−1 ) exceeds a second predetermined value. Here, this second predetermined value determines the maximum degree of deviation of the fully closed position of the window glass, and is preferably set optimally depending on the pulse resolution and the window frame structure.

If the determination in step 216 is affirmative, the deviation of the window glass fully closed position is unacceptable (the position detection error cannot be ignored), so the routine proceeds to step 218, where the current count value is set to the previous count value. Update. On the other hand, if the determination in step 216 is negative, the control ends as it is.

On the other hand, if the determination in step 210 is negative, the window glass 52 may be caught by some foreign matter.
It is determined that the contact has occurred, and the process proceeds to step 212, and the trapping prevention process is performed. This trapping prevention processing is specifically performed by controlling the motor 12 so that the window glass 52 is stopped at that position and then lowered by a predetermined amount and stopped. After the pinching prevention process is completed, the control is ended.

Besides this, the power window operation switch 1
6 is operated, the automatic descending command, the manual ascending command,
When the manual descending command is input, the CPU 30
Then, the motor is controlled according to the command, but the control method in these cases is publicly known, and therefore the description thereof is omitted here.

As described above, according to the second embodiment, each time the window glass 52 stops at the position (the position determined to be the fully closed position), the difference between the previous count value and the present count value is calculated. Is greater than the second predetermined value, the current count value is updated to the previous count value. For this reason, when the window glass 52 is stopped at a position away from the fully closed position due to some reason and stops, and the like, the deviation from the regular fully closed position can be ignored. Since the previous count value corresponding to the position is updated, the subsequent position detection of the window glass 52 is performed with the count value corresponding to the previous window glass fully closed position as a reference. As a result, not only the chattering output of the pulse generator 14 when the motor 12 is stopped and the error in counting the pulse value due to the addition of the reverse rotation direction pulse output that is additionally generated at the time of starting the reverse rotation after the motor is stopped, Prevents deterioration of position detection accuracy even when the power supply voltage of the motor 12 suddenly drops, or when the window glass 52 stops at an intermediate position due to pinching of small foreign matter (dust etc.) (occurs in the pinching prevention area) can do. Therefore, the accuracy of the position detection of the window glass 52 can be maintained in the initial state even when the position of the fully closed position suddenly changes, and the reliability of the detection / release of the foreign matter entrapment and the window glass raising / lowering control can be maintained. It is possible to improve the sex.

Also in the case of the second embodiment, after it is judged whether or not the rate of change R _{n of the} number of revolutions is equal to or less than a predetermined value (step 208), it is judged whether or not it is in the entrapment prevention release area ( Step 210) exemplifies a case in which the pinch prevention process is performed if it is not the pinch prevention release region, and the motor is immediately stopped when the pinch prevention release region is determined to be the fully closed position. It may be possible to determine whether or not the rate of change R _n of the rotational speed has become equal to or less than a predetermined value only when it is not in the entrapment prevention release region after the determination is performed first.

In the above first and second embodiments, the case where the trapping prevention processing and the update of the count value and the like are performed only in the case of the automatic ascending has been exemplified, but these are not performed even in the case of the manual ascending. It is possible.

[0052]

As described above, according to the present invention, there is an unprecedented excellent effect that the position detection and the elevation position control of the window glass can be accurately performed.

Further, when the present invention is applied to, for example, a power window controller having a pinch prevention function in which a pinch prevention release area is set, foreign matter trapping detection is performed even when the window glass fully closed position is slightly changed. -It is possible to improve the reliability of release and window glass elevation control.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a power window control device according to a first embodiment.

2 is a flowchart of a main routine showing a main control algorithm of the CPU of FIG.

FIG. 3 is a flowchart of an interrupt routine.

FIG. 4 is a flowchart of a main routine showing a main control algorithm of the CPU according to the second embodiment.

FIG. 5 is a diagram for explaining an entrapment prevention release area.

FIG. 6 is a diagram for explaining a problem to be solved by the present invention and is a diagram for explaining a state in which a window glass fully closed position is displaced.

FIG. 7 is a diagram for explaining a problem to be solved by the invention and is a diagram showing a change in output of a pulse generator.

[Explanation of symbols]

10 power window control device 12 motor 14 pulse generator 30 CPU (detection means, position detection means, control means, initial value resetting means) 52 window glass

Claims (2)

[Claims] 1. A motor for driving window glass up and down, a pulse generator for generating a number of pulses proportional to the number of rotations of the motor in the forward and reverse directions, and a pulse generator for driving the window glass when it reaches a reference position. Detection means for detecting, counting the output pulse of the pulse generator, position detection means for detecting the position of the window glass based on the count value and an initial value predetermined corresponding to the reference position, A control unit that controls the motor according to the position detected by the position detection unit and an external command; and the count value each time the detection unit detects that the window glass reaches a certain number of reference positions. An initial value resetting means for resetting the initial value, the power window control device. 2. A motor for driving window glass up and down, a pulse generator for generating a number of pulses proportional to the number of rotations of the motor in the forward and reverse directions, and a motor for driving the window glass when the window reaches a reference position. Detection means for detecting, counting the output pulse of the pulse generator, position detection means for detecting the position of the window glass based on the count value and an initial value predetermined corresponding to the reference position, The control means for controlling the motor in accordance with the position detected by the position detection means and an external command; and, every time the detection means detects that the window glass reaches the reference position, the window glass this time becomes the reference. Obtain the difference between the count value when the position reached the position and the count value when the window glass reached the reference position last time, and if the difference exceeds the predetermined value, change the current count value to the previous count value. To A reference count value updating means new to, power window control apparatus having a.