JP2004076265A - Power window control device - Google Patents

Abstract

Provided is a vehicle power window control device capable of detecting a foreign object being caught in an initial stage of opening and closing a window provided in a vehicle.
A rotation angle of a motor when driving a window is converted into a pulse signal by an encoder. The window position is detected by counting the pulse signals in the window position detection unit 30. The standard value storage unit 60 stores a standard pulse width value when the motor is driven at each window position. When the window rises, the pinch detection unit 50 causes the standard value detection unit 60 to read the standard pulse width value based on the detected window position, and causes the correction unit 70 to correct the pulse width based on the temperature and the battery voltage. The corrected pulse width standard value is input to the entrapment detection unit, where it is compared with the current pulse width. If the current pulse width is large, it is determined that there is jamming, the result of the determination is output to the motor control unit 40, and motor control such that the window is lowered is performed.
[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 opening and closing control of the window provided in the vehicle, an encoder that converts the rotation angle of the motor that drives the window glass into a pulse signal is provided, and the opening and closing state of the window is detected by counting the pulse signal from the encoder. I have. Further, when closing the window, the size of the pulse width 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]
Although the vehicle power window control method that has been studied so far generally clears the above-mentioned allowable value, the fact is that the weight is still high at the initial stage of closing the window.
That is, as described above, the detection of entrapment is performed based on the pulse width at the time of driving the window glass. Therefore, for example, the pulse width is compared with a predetermined number of previous pulse widths to check the extension of the pulse width. Accordingly, when the entrapment is detected, the entrapment cannot be detected in the early stage of the drive in which 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.
In this initial stage, even if, for example, the reference value is substituted by a predetermined value, the behavior of the window glass is unstable, so that the pulse width greatly varies and the possibility of erroneous detection is high. In order to prevent this, the predetermined value is set to a large value. However, in this case, the detection of the entrapment is delayed, and the possibility of giving high weight is increased.
[0004]
FIG. 5 is a diagram showing the relationship between the position of the window glass and its behavior.
The horizontal axis indicates the position of the window glass, and the vertical axis indicates the frequency difference between the pulse frequency a predetermined number of times earlier and the current pulse frequency.
When closing the window by raising the window glass from the lower end, the motor reverses the direction of rotation from the previous lowering to the upward direction at the beginning, so the power transmission mechanism and the deflection of the wire are absorbed, causing idling. Then, the rotation speed of the motor rapidly increases in the region A. When entering the area B, the window glass is pushed up, and the speed is reduced at once by the weight. Therefore, the pulse width output from the encoder fluctuates greatly, and the behavior of the window glass is unstable.
[0005]
From the half-open state to the vicinity of the upper end, the pulse width is almost constant, the frequency difference is not largely changed, and the window glass is driven stably. At the upper end, the window glass slides due to friction with the sealing material, the rotation speed of the motor gradually decreases, and the pulse width increases. When the frequency difference from the pulse frequency a predetermined number of times before reaches the detection determination value, the window is determined to be fully closed, and the motor drive is stopped.
[0006]
When the window glass is driven from the half-open state to the closing direction, the behavior of the window glass differs depending on the rotation direction of the motor before stopping. That is, when the motor is stopped after being raised, the motor can be driven stably in the same manner as in the half-open state shown in FIG. 5, but when stopped after the motor has been lowered, the rotation direction of the motor is reversed. And the deflection of the wire must be absorbed, the pulse width fluctuates largely like the initial A and B regions, and the behavior of the window glass is unstable.
[0007]
Therefore, in the initial stage of closing the window, the fluctuation of the pulse width is large. Therefore, as shown in FIG. 6, the entrapment detection performed by the difference between the pulse width of the predetermined number (N−X) and the pulse width of the current (NOW) is not performed. However, the control for reversing the window glass becomes extremely unstable, including many false detections.
In addition, there has been proposed a device that performs PWM control on a motor using a transistor (FET) so as to limit the weight of a foreign substance. However, there has been a problem that the device becomes expensive.
SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described conventional problems, and has as its object to provide a power window control device that is inexpensive and that can detect entrapment of foreign matter even at the initial stage of opening and closing the window.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 has an encoder that converts a rotation angle of a motor that drives the opening / closing body into a pulse signal, detects the position of the opening / closing body by counting the pulse signal, and is based on a pulse width at the time of driving. In a power window control device capable of controlling the motor to detect the entrapment of foreign matter in the opening / closing body and reversing the opening / closing direction of the opening / closing body during driving, a pulse width standard value at the initial stage of driving in each opening / closing body By comparing a pulse width when driving the open / close body with a pulse width standard value corresponding to the position of the open / close body and read out from the standard value storage means. And a pinch detecting means for detecting pinching of the body.
When driving the opening / closing body, the entrapment of a foreign object is detected by comparing the pulse width corresponding to the rotation angle of the motor with the stored pulse width standard value at the same opening / closing body position. The entrapment can be detected from the first driving pulse.
[0009]
The invention according to claim 2 is provided with current detecting means for detecting a driving current of the motor, and a standard driving current value of the motor at an initial stage of driving at each of the opening / closing member positions is stored in the standard value storage means. The entrapment detection unit compares the drive current of the motor with a drive current standard value corresponding to the position of the opening / closing member and read from the standard value storage unit, and determines that the drive current is a predetermined value from the drive current standard value. Only when it is large, the entrapment is detected.
It is determined whether the drive current of the motor is larger than the standard value of the drive current at the same opening / closing body position by a predetermined value, and the result of the determination is used as a condition for pinch detection. The effect that can be prevented is obtained.
[0010]
According to a third aspect of the present invention, the standard value storage means includes a voltage detection means for detecting a power supply voltage for driving the motor, a temperature detection means for detecting an environmental temperature, and the detected power supply voltage and the environmental temperature. And a correcting means for correcting the standard pulse width and the standard driving current read from the CPU.
Since the pulse width standard value and the drive current standard value used for comparing the pulse width and the drive current are corrected according to the power supply voltage for driving the motor and the environmental temperature, the comparison can be performed under the same conditions. Entrapment detection can be performed with higher accuracy.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the invention will be described with reference to examples.
FIG. 1 is a diagram illustrating the configuration of the embodiment.
The motor 10 drives a window glass (open / close body) not shown to open and close the window. The rotation angle of the motor 10 is converted into a pulse signal by the encoder 20.
The window position detecting unit 30 includes a counter, and receives a pulse signal from the encoder 20 and counts with the counter to detect a window glass position. In the counter, the count value is set to zero at the lower end position where the window glass is completely lowered, and when the window glass rises, the pulse signal is counted up, and when the window glass is lowered, the pulse signal is counted down. Thereby, the absolute position of the window glass is detected.
[0012]
The window position detection unit 30 stores the number of pulse signals when the window glass is driven from fully open to fully closed. When the count value of the counter matches the stored number of pulse signals, it is determined that the window is fully closed. Then, the result of the determination is output to the motor control unit 40, and the motor drive is stopped.
The window glass position detected by the window position detection unit 30 is output to the pinch detection unit 50.
A standard value storage unit 60 is connected to the entrapment detection unit 50, and the standard value storage unit 60 stores a pulse width standard value at the beginning of driving at each window glass position. Regarding the pulse width standard value, the window glass is used for ascending and descending, and each is prepared for each driving condition depending on whether the previous driving is descending or ascending.
These pulse width standard values are obtained by experiments with the battery voltage for driving the motor 10 and the environmental temperature set to predetermined values.
[0013]
The pinch detection unit 50 outputs the input window glass position to the standard value storage unit 60, and the standard value storage unit 60 outputs the pulse width standard at the same position corresponding to the driving state of the window glass according to the window glass position. The value is extracted and output to the correction unit 70. A temperature sensor 80 for detecting the environmental temperature and a voltage sensor 81 for detecting a battery voltage for driving the motor 10 are connected to the correction unit 70. The correction unit 70 corrects the standard pulse width based on the detected values. The corrected pulse width standard value is output to the pinch detection unit 50.
[0014]
The entrapment detection unit 50 receives a pulse signal in real time from the encoder 20 and compares the pulse width with the corrected pulse width standard value. If the pulse width is larger than the pulse width standard value, it is determined that foreign matter is trapped, and the result of the determination is output to the motor control unit 40, whereby the driving direction of the motor 10 is reversed. This drives the window glass in the opposite direction.
The motor control unit 40 outputs a signal from an up / down switch for user operation (not shown) in addition to the result of the determination from the window position detection unit 30 and the pinch detection unit 50. The motor control is performed by determining the rotation direction of the motor.
[0015]
FIG. 2 is a flowchart showing the flow of the pinch detection in the above configuration.
First, in step 100, the pinch detection unit 50 inputs the window glass position detected from the window position detection unit 30, and determines whether the window glass position has changed. If it is detected that the window glass is being driven, the process proceeds to step 110.
In step 110, the pinch detection unit 50 determines whether the window glass is moving upward or downward based on a change in the position of the window glass. Further, the driving state of the window glass is determined based on the stored driving direction of the previous window glass, and the result of the determination and the input window glass position are output to the standard value storage unit 60. The pulse width standard value at the same position corresponding to the driving situation is extracted. Then, the extracted pulse width standard value is read into the correction unit 70.
[0016]
In step 120, the detected value of the battery voltage for driving the motor is read by the correction unit 70.
In step 130, the correction unit 70 determines whether or not the battery voltage matches a predetermined voltage value as a condition for obtaining a pulse width standard value. If they match, there is no need to perform correction, and the process proceeds directly to step 150. If the voltage does not match the predetermined voltage value, the process proceeds to step 140, and the pulse width standard value is corrected according to the detected battery voltage (voltage value).
[0017]
In step 150, the detected value of the environmental temperature is read from the temperature sensor 80 into the correction unit 70.
In step 160, it is determined whether or not the detected temperature value matches a predetermined temperature as a condition for obtaining a pulse width standard value. If they match, the process proceeds to step 175 because there is no need to correct the pulse width standard value by temperature. If the temperature does not match the predetermined temperature, in step 170, the pulse width standard value is corrected based on the detected temperature value.
As described above, the pulse width standard value is corrected by the voltage and the temperature, so that the pulse width standard value can be compared with the pulse width under the same condition.
[0018]
In step 175, the entrapment detection unit 50 reads the current pulse signal from the encoder 20.
In step 180, the pulse width of the input pulse signal is compared with a pulse width standard value. If the pulse width is equal to or smaller than the pulse width standard value, it is determined that there is no entrapment, and the process returns to step 100.
If the pulse width is larger than the pulse width standard value, a large load is applied to the motor 10, and it is determined that the motor 10 is pinched. In step 190, a control signal is output to the motor control unit 40 to reverse the driving direction of the motor 10. And return to step 100.
By reversing the driving direction of the motor 10, the moving direction of the window glass is reversed.
[0019]
This embodiment is configured as described above, and stores the pulse width standard value at each window glass position in the standard value storage unit 60, and when opening and closing the window, the pulse width at the same position according to the window glass position. Standard values are extracted. The pulse width standard value is corrected based on the battery voltage for driving the motor 10 and the temperature, and the pulse width at the time of the current drive is compared to determine the entrapment. From the first pulse, the pinch can be detected, and the window glass can be inverted before a large weight is applied to the foreign matter.
[0020]
As described above, the conventional method can be implemented simply by providing a temperature sensor or the like, and the other methods can be implemented by modifying the software. Therefore, the effect that the configuration can be less expensive than the method of performing the PWM control or the like can be obtained. .
[0021]
Next, a second embodiment will be described.
In the present embodiment, measures are taken to prevent a malfunction in the first embodiment.
In the configuration shown in FIG. 1, a current sensor 82 for detecting the drive current of the motor 10 is provided, and the detected value is output to the pinch detection unit 50 '. In addition, the standard value storage unit 60 'stores the drive current standard value at each window glass position. The drive current standard value is obtained by an experiment with the battery voltage for driving the motor 10 and the environmental temperature set to predetermined values, similarly to the pulse width standard value.
[0022]
FIG. 3 is a flowchart illustrating a flow of the pinch detection in the present embodiment. From step 100 to step 180, the pulse width standard value read corresponding to the window glass position is corrected based on the battery voltage and the temperature, as in the first embodiment. In step 180, in the first embodiment, entrapment detection is performed by comparing the pulse width at the time of driving with the corrected pulse width standard value. However, in this embodiment, if entrapment is detected, It is held as temporary detection.
[0023]
Then, in step 200, the pinch detection unit 50 'outputs the window current position to the standard value storage unit 60', thereby extracting the drive current standard value.
In step 210, the driving current standard value is corrected using the battery voltage and the temperature at the time of correcting the pulse width standard value.
In step 220, the pinch detection unit 50 'reads the current drive current detection value from the current sensor 82.
[0024]
In step 230, the drive current is compared with a drive current standard value to determine whether or not the drive current is larger than a predetermined value. If it is not larger than the predetermined value, it is determined that the entrapment detected in Step 180 is an erroneous detection, and the process returns to Step 100 as it is.
If the drive current is larger than the predetermined value, it is determined that the entrapment has been detected, and the entrapment detection unit 50 'outputs an inversion control signal to the motor control unit 40.
In step 240, the motor control unit 40 reverses the driving direction of the motor 10, and returns to step 100.
Thereby, the window glass is inverted.
[0025]
FIG. 4 is a diagram illustrating a relationship between a window glass position and a drive current.
When the window is driven from the fully opened lower end, the motor 10 reverses the driving direction from the previous descent to the ascending direction, so that idling occurs to absorb the bending of the mechanism and the wire. Therefore, the drive current once decreases and then increases. Driving in the half-open state can be driven with substantially steady current. At the upper end, the drive current increases due to friction or the like.
[0026]
When the window glass is driven from a state where the window is half-opened, the current may once drop and then rise as in the lower end shown in FIG. As described above, since the drive current is small in the initial stage of the drive, the determination made based on, for example, the detection threshold provided according to the steady-state current may have an erroneous detection in the initial stage.
However, in this embodiment, since the drive current standard value to be compared with the drive current corresponds to the position of the window glass, erroneous detection can be prevented even at the beginning of driving.
[0027]
The present embodiment is configured as described above. When the entrapment is detected by the pulse width, the driving current is checked and the entrapment is detected only when an abnormal current occurs. This can prevent erroneous detection caused by the extension of irrespective of the driving condition.
Although the above embodiment describes only the unstable state at the beginning of driving, after the stable driving state, the pulse width at the time of driving is compared with the pulse width of a predetermined number of times before as before. Thus, the entrapment may be detected. Then, the timing of transition from the control at the initial stage of driving of the present embodiment to the stable state is appropriately determined by experiments or the like.
[0028]
【The invention's effect】
According to the first aspect of the present invention, when the opening / closing member is initially driven, the entrapment of a foreign object is detected by comparing the pulse width corresponding to the rotation angle of the motor with the stored pulse width standard value at the same opening / closing member position. Thus, the entrapment can be detected from the first pulse for driving the opening / closing body, the opening / closing body can be quickly reversed, and an effect of not applying a high weight to the foreign matter can be obtained.
[0029]
According to the second aspect of the present invention, it is determined whether or not the drive current of the motor is larger than a standard value of the drive current at the same opening / closing member position by a predetermined value. As a result, the effect of preventing erroneous detection can be obtained.
[0030]
According to the third aspect of the present invention, the standard pulse width and the standard driving current used for comparing the pulse width and the driving current are corrected by the power supply voltage for driving the motor and the environmental temperature. In the following, the comparison can be performed, and an effect that the pinch detection can be performed with higher accuracy can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an embodiment.
FIG. 2 is a flowchart illustrating a flow of pinch detection.
FIG. 3 is a flowchart illustrating a flow of pinch detection.
FIG. 4 is a diagram showing a relationship between a window glass position and a drive current.
FIG. 5 is a diagram showing the relationship between the position of a window glass and its behavior.
FIG. 6 is a diagram for explaining pinch detection by a pulse width;
[Explanation of symbols]
Reference Signs List 10 Motor 20 Encoder 30 Window position detection unit 40 Motor control units 50 and 50 'Pinch detection unit (Pinch detection means)
60, 60 'standard value storage unit (standard value storage means)
70 Correction unit (correction means)
80 temperature sensor (temperature detecting means)
81 Voltage sensor (voltage detection means)
82 Current sensor

Claims (3)

It has an encoder that converts the rotation angle of the motor that drives the open / close body into a pulse signal, detects the position of the open / close body by counting the pulse signal, and detects foreign matter in the open / close body based on the pulse width during driving. In a power window control device capable of motor control for detecting entrapment and reversing the opening / closing direction of the opening / closing body during driving,
Standard value storage means for storing a pulse width standard value at the time of initial drive at each opening and closing body position,
A pulse width for driving the open / close body, and a pulse width standard value corresponding to a position of the open / close body and compared with a pulse width standard value read from the standard value storage means, to detect entrapment of the open / close body; A control device for a power window, comprising: A current detecting means for detecting a driving current of the motor is provided, and a standard value of a driving current of the motor at an initial stage of driving at each of the opening / closing member positions is stored in the standard value storage means.
The entrapment detection unit compares the drive current of the motor with a drive current standard value corresponding to the position of the opening / closing member and read from the standard value storage unit, and determines that the drive current is a predetermined value from the drive current standard value. 2. The power window control device according to claim 1, wherein the entrapment is detected only when it is large. Voltage detection means for detecting a power supply voltage for driving the motor, temperature detection means for detecting an environmental temperature,
3. The apparatus according to claim 1, further comprising a correction unit configured to correct the pulse width standard value and the drive current standard value read from the standard value storage unit based on the detected power supply voltage and environmental temperature. Power window control device.

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