JP3553280B2 - Power window switch device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an in-vehicle power window switch device, and in particular, to a device having a function of preventing a hand or the like from being pinched by a vehicle window.
[0002]
[Prior art]
The anti-jamming function provided in the conventional on-vehicle power window switch device detects a current value flowing through a motor for moving the vehicle window up and down, and detects a current value at a current time and a predetermined time before the current time. , And when this current difference is higher than a preset pinch detection threshold value, it is determined that the hand or the like is pinched (hereinafter referred to as pinch state), The motor was stopped or rotated in the reverse direction to prevent pain in the hands and the like.
[0003]
[Problems to be solved by the invention]
However, when the power window device is driven while the vehicle is traveling on a rough road, the value of the current flowing through the motor fluctuates greatly up and down. Therefore, the current difference may accidentally exceed the detection threshold value, and in the above-described determination method, the motor may be erroneously determined to be in the pinched state, and the motor may be stopped or rotated in the reverse direction. In order to prevent such erroneous detection, the detection threshold value may be set to a higher value. However, since the detection load for judging the entrapment state is increased, the user feels pain when actually pinching the hand.
The present invention has been made to solve the above-described problem, and there is a possibility that a state where the vehicle is traveling on a pavement road or the like (hereinafter, referred to as a normal state) and an erroneous detection when traveling on a rough road or the like. A power window that detects erroneous conditions and raises the detection threshold when driving on rough roads to prevent erroneous detection of entrapment, and reduces the detection load in normal conditions to prevent pain when a hand is pinched. It is an object to provide a switch device.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an operation switch for instructing vertical driving of a vehicle window, a motor for vertically driving a vehicle window, and an operation command given to the motor based on instruction information from the operation switch. And a controller for taking in the current value and controlling the motor operation, the controller determines a current difference between the motor current value at the current time and the motor current value at a predetermined time before the current time by a predetermined period. and calculating means for determining, in I Ri the obtained current difference and the car window to the calculating means is compared with the threshold for pinching the finger or the like determines whether the resulting current difference exceeds the threshold value when entrapment determination means for determining the occurrence, determining means and conditions that may be erroneously detected in the normal state and the other from the change in the motor current value, determine When it is determined that the state that might be erroneously detected by the means and raising the threshold, when it is judged that entrapment occurs by determining means, and control means stops driving the motor, or reversing The determination means determines that the current state obtained by the calculation means does not exceed a certain value, and determines that the current state is in a normal state. If the number of zero-point intersections of the current difference calculated by the calculation means within a time period is equal to or less than a certain value, it is determined that the vehicle is in a rough road traveling state in which there is a possibility of erroneous detection .
[0005]
In this configuration, it is possible to determine the normal state and other states that may be erroneously detected, and in particular, it is possible to determine the rough road traveling state as the state that may be erroneously detected. Then, to increase the detection threshold to be determined rough road shape on purpose, it can be set lower than the detection threshold in the normal state before. As a result, it is possible to reduce the possibility of erroneously detecting the occurrence of the entrapment even though the entrapment has not occurred, and to reduce the detection load in the normal state, so that the pain at the time of the entrapment can be reduced. Also, since that allows the determination of rough road shape on purpose the normal state in the same configuration as ever, it is not necessary to change the system.
In addition, it is determined that the vehicle is traveling on a rough road when the current difference between the current value before the predetermined time and the current current exceeds a certain value, and the number of zero-point crossings of the current difference within the certain time after that. It is performed when it is less than a certain value. Therefore, in a state where the current value flowing through the motor largely fluctuates up and down, it is possible to more accurately discriminate between a normal state and a rough road traveling state, and erroneous detection of pinching is further reduced.
[0007]
Further, the present invention, the determining means, when the current difference obtained by the calculation means exceeds a predetermined value, further, erroneous detection when the current difference thereof exceeds another predetermined value greater than the previous SL constant value together determined to be overloaded of possible states, determined in the absence at any state of the rough road running condition and overload state is in a normal state, the control means, the overload by determining means When it is determined that the state is in the state , the threshold value may be increased. In this configuration, beyond the current difference between the current value and the current of the current value before Jo Tokoro time constant value, further, the overload state when the current difference thereof exceeds another predetermined value greater than the predetermined value Is determined. Therefore, a state that the value of the current flowing through the motor swings suddenly increased, it is possible to identify whether the normal state or the overload state, the sudden judgment of the entrapment detection when it is determined that an overload condition the threshold is raised for, the clamping seen inclusive erroneous detection becomes even less.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a power window switch device according to the present embodiment, and FIG. 2 is a block diagram of a control system of the power window switch device. The power window device 1 includes a controller 6 including a power window switch 3 for instructing up / down of the vehicle window 2, a motor 4 driven by the up / down instruction, and a driving device 5 for moving the vehicle window 2 up and down by the driving force of the motor 4. Consists of
[0009]
When the user operates the knob 3a of the power window switch 3 to give an up / down instruction of the vehicle window 2, this up / down instruction information is converted into an electric signal by the knob switch 3b and transmitted to the CPU 8 via the input unit 7 of the controller 6. Is entered. The CPU 8 drives the motor 4 via the output unit 9 based on the input knob information. Further, the CPU 8 takes in the motor current value, and determines whether or not a foreign object is being caught in the vehicle window 2 based on the motor current value. The CPU 8 calculates a current difference, a determination unit that determines whether the jamming has occurred based on the calculation unit, a determination unit that determines whether the vehicle is traveling on a rough road, and a control that controls the driving of the motor 4. Means. The method of determining whether or not the vehicle is in the pinching state and the method of determining whether or not the vehicle is running on a rough road will be described in detail below.
[0010]
FIGS. 3 (a) and 3 (b) show the voltage of the motor 4 when the power window switch device 1 is operated in a normal state and a rough road state of a vehicle equipped with the power window switch device 1 according to the present embodiment. FIG. 4 is a diagram showing a change in a current flowing through a motor 4. As shown in FIG. 2A, the voltage value and the current value in the normal state show constant values when the vehicle window 2 is operating smoothly, and when the hand or the like is pinched, the voltage decreases, The current rises. Further, as shown in FIG. 3B, in a rough road condition, the voltage and the current always fluctuate up and down.
[0011]
Next, a method of determining a normal state and a rough road state by the CPU 8 of the power window switch device 1 according to the present embodiment will be described with reference to FIG. FIGS. 4A, 4B, 4C, and 4D show how the difference between the current values changes during a certain time (5 ms). FIG. 6A is a diagram showing a change in the current difference when the fluctuation of the current difference is small in the normal state, and FIG. 6B is a diagram showing a change in the current difference when the fluctuation of the current difference is large in the normal state. FIG. 3C is a diagram showing a change in the current difference in a rough road condition, and FIG. 4D is a diagram showing a case where the air conditioner and the like are simultaneously operated, resulting in an overload and sudden vibration. FIG. 6 is a diagram showing a state of a change in a current difference of FIG. The power window switch device 1 according to the present embodiment includes a normal state ((a) and (b) of FIG. 1) and a state where erroneous detection such as running on a rough road or overload (hereinafter referred to as an abnormal state). (C) and (d)), and when it is determined that the state is abnormal, the detection threshold is raised to prevent erroneous detection.
[0012]
Here, a method for determining the four states shown in FIG. 4 will be described in detail.
(1) In the normal state of FIG. 4A, the state in which the fluctuation of the current difference is small and the other state are determined based on whether or not the current difference exceeds a certain value a.
(2) In the normal state of FIG. 4 (b), the state where the fluctuation of the current difference is large, and in the determination of the rough road state in FIG. 4 (c), it is determined whether or not the number of crossing zero points within a certain time is a certain value or more. Is determined by
(3) The determination of the overload state in FIG. 4D is made by determining whether or not the value suddenly exceeds the predetermined value b.
By performing the determination of each state by the above three methods, it is possible to determine a normal state and an abnormal state such as running on a rough road or overload driving before performing the pinch detection. By raising the entrapment detection threshold when it is determined that the entrapment has occurred, it is less likely that an entrapment will be erroneously detected in an abnormal state. Further, since the pinch detection threshold value in the normal state can be set lower than before, the detection load in the normal state can be reduced, and the pain at the time of pinch can be reduced.
[0013]
FIG. 5 is a diagram showing a change in the current value and the timing of the determination of the normal state and the abnormal state of the power window switch device 1 corresponding thereto. In the same figure, there is a possibility of erroneous detection at the point indicated by the arrow. However, in order to determine an abnormal state and raise the entrapment detection threshold, in the abnormal state, an erroneous detection that entrapment has occurred even though entrapment has not occurred. Such things are reduced.
[0014]
The operation of determining whether the power window switch device 1 according to the present embodiment is in the normal or abnormal state and the operation of determining the pinched state will be described with reference to the flowchart in FIG. The power window switch device 1 measures the value of the current flowing through the motor 4 for moving the vehicle window 2 up and down, takes the difference between the current value and the current value a predetermined time ago, and sets the current difference ΔI to a constant value a. Compare (S1). This makes it possible to discriminate between the above-described normal state in FIG. 4A and other states. If the current difference ΔI is larger than the fixed value a (YES in S1), it is determined that the state is as shown in FIGS. 4B, 4C, and 4D, and whether or not the number crossing the 0 point is being measured. It is checked (S2). If measurement has not been performed (NO in S2), measurement is started (S3), the number of zero point intersections for a certain time is measured (S4), and measurement is continued until a certain time has elapsed (S4). S5). If the number of zero-point intersections is being measured (YES in S2), the number of zero-point intersections for a certain time is measured (S4), and the measurement is continued until a certain time elapses (S5). On the other hand, if the current difference ΔI is smaller than the fixed value a (NO in S1), it is determined that the current state is the normal state in FIG. 4A, and it is checked whether the number of zero-point intersections is being measured (S12). If the measurement is in progress (YES in S12), the number of zero point intersections in a certain time is measured (S4), and the measurement is continued until a certain time elapses (S5). If the zero point intersection number is not being measured (NO in S12), it is checked whether or not a certain time has elapsed (S5).
[0015]
When the fixed time has elapsed (YES in S5), the measurement of the number of 0-point intersections is terminated (S6), and the number of 0-point intersections is compared with a fixed value (S7). This makes it possible to discriminate between the normal state shown in FIG. 4B and the states shown in FIGS. 4C and 4D. When the number of 0-point intersections is larger than a certain value (YES in S7), it is determined to be the normal state in FIG. 4B, and the pinch detection threshold It is not changed (S8). On the other hand, when the number of zero-point intersections is smaller than the predetermined value (NO in S7), it is determined that the road is in the bad road state in FIG. 4C, and the pinch detection threshold It is raised (S13). Next, the current difference ΔI is compared with a constant value b (S9), and it is determined whether or not an overload state shown in FIG. If it is smaller than the constant value b (NO in S9), it is determined that the vehicle is not in the overload state, and the current difference ΔI is compared with the pinch detection threshold It (S10). On the other hand, if the current difference ΔI is larger than the fixed value b (YES in S9), it is determined that an overload condition has occurred, the pinch detection threshold It is increased (S14), and the current difference ΔI is pinched. It is compared with It (S10). In S10, if the current difference ΔI is greater than the pinch detection threshold It (YES in S10), it is determined that the pinch state is established (S11). On the other hand, if the current difference ΔI is smaller than the pinch detection threshold It (NO in S10), it is determined that the pinch state is not established (S15). Note that even when the predetermined time has not elapsed in S5 (NO in S5), the current difference ΔI is compared with the constant value b (S9).
[0016]
As described above, before the pinch detection is performed, the normal state and an abnormal state such as running on a rough road or an overload state are determined. When the abnormal state is determined, the pinch detection threshold is increased. In the state, the occurrence of erroneous detection that pinching has occurred is reduced. Further, since the pinch detection threshold value in the normal state can be set lower than before, the detection load in the normal state can be reduced, and the pain at the time of pinch can be reduced.
[0017]
【The invention's effect】
According to the present invention as described above, and rough road conditions that might current information by Riayama detection, to determine a normal state, it is sandwiched between determining the rough road running condition so as to raise the detection threshold Therefore, the pinch detection threshold in the normal state is set low, the detection load can be reduced, and the pain felt when a finger is pinched can be reduced. Also, since that allows the determination of the normal state and the rough road traveling shaped on purpose in the same configuration as ever, it is not necessary to change the system. Moreover, when the current difference between the current value of the motor current value and the current value before the predetermined time exceeds a certain value, and the number of zero-point crossings of the current difference within the certain time is equal to or less than a certain value. It is determined that the vehicle is on a rough road. With this, it is possible to determine whether the current value flowing through the motor fluctuates greatly up and down, and determine whether the current state is a normal state or a rough road state. This reduces the possibility of erroneous detection of occurrence of entrapment in a rough road condition.
[0019]
Further, according to the present invention, the motor current value current difference between the current value before the current value and Jo Tokoro time at the current time point exceeds a certain value, further, the current difference is another greater than the predetermined value thereof If it exceeds a certain value, it is determined that an overload state is present. With this, it is possible to determine whether the current value flowing through the motor suddenly largely fluctuates, and determine whether the motor is in a normal state or an overload state. This reduces the possibility of erroneous detection of occurrence of entrapment in the overload state.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a power window switch device according to an embodiment of the present invention.
FIG. 2 is a block diagram of a control system of the power window switch device according to the embodiment of the present invention.
3A is a diagram illustrating changes in motor voltage and current in a normal state, and FIG. 3B is a diagram illustrating changes in motor voltage and current in a rough road state.
4 (a) and 4 (b) are diagrams showing a change in a current difference flowing through a motor in a normal state, FIG. 4 (c) is a diagram showing a change in a current difference when traveling on a rough road, and FIG. 4 (d). FIG. 5 is a diagram showing a change in a current difference during overload operation.
FIG. 5 is a diagram showing a change in a current difference between a normal state and an abnormal state.
FIG. 6 is a flowchart for explaining an operation of judging a pinching state and a method of judging a normal state and an abnormal state in the power window switch device according to the embodiment of the present invention.
[Explanation of symbols]
1 Power window switch device 2 Car window 3 Power window switch (operation switch)
4 motor 8 CPU (controller; calculation means, judgment means, judgment means, control means)

Claims (2)

An operation switch for instructing vertical driving of the vehicle window, a motor for vertically driving the vehicle window, and an operation command given to the motor based on instruction information from the operation switch, and a current value of the motor is taken in to control the motor operation. A power window switch device having a controller
The controller is
Calculating means for calculating a current difference between the motor current value at the current time and the motor current value at a predetermined time before the current time at a predetermined cycle ;
Comparing the threshold value for determining whether or not entrapment of fingers or the like occurs in the I Ri the obtained current difference and the car window to the calculating means, when the current difference exceeds the threshold value, the entrapment occurs Determining means for determining that
Judgment means for judging a normal state from the change in the motor current value and other states that may be erroneously detected ,
When it is determined by the determination means that there is a possibility of erroneous detection , the threshold value is increased, and when the determination means determines that the jamming has occurred, the driving of the motor is stopped, or the motor rotates in reverse. and control means for,
The determining means includes:
If the current difference obtained by the calculation means does not exceed a certain value, it is determined that the normal state,
If the current difference obtained by the calculating means exceeds a certain value, there is a possibility that the current difference calculated by the calculating means within the certain time thereafter is erroneously detected if the number of zero-point intersections is less than a certain value. A power window switch device, which determines that the vehicle is traveling on a rough road in a certain state . It said determining means, if the current difference obtained by the calculation means exceeds a predetermined value, further, might be erroneously detected when the current difference thereof exceeds another predetermined value greater than the previous SL constant value state while determining that the overload condition, determining that the absence in any state of the rough road running condition and the overload condition is in a normal state,
2. The power window switch device according to claim 1 , wherein the control unit increases the threshold value when the determination unit determines that the vehicle is in an overload state . 3.

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