JP3553276B2 - 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 or a rotation speed of the motor for moving the vehicle window up and down, and detects a current value or the rotation speed at the current time. A difference from one current value or a rotation speed at a predetermined time before the current time point is obtained, and when the current difference or the rotation speed difference is higher than a pinch detection threshold, a state in which a hand or the like is pinched (hereinafter, referred to as a pinch). (Referred to as a pinched state), and the motor is stopped or rotated in the reverse direction to prevent pain in the hand or 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 current value flowing to the motor or the rotation speed of the motor greatly fluctuates up and down. For this reason, the current difference or the rotation speed difference may accidentally exceed the detection threshold value, and in the above-described determination method, the motor may be erroneously determined to be in a 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.
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and does not increase the threshold value for detecting the occurrence of pinching of a hand or the like in a vehicle window. It is an object of the present invention to provide a power window switch device that does not erroneously detect the power supply and that can reduce the pinch detection load so as to reduce pain when pinched.
[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. in a power window switch and control means for controlling the motor operation captures the current value or the speed value, the control means than the motor current or the motor speed and the present time at the present time the motor current at a past time Calculating means for calculating the difference between the value or the motor speed for each of a plurality of different past times; and a value calculated by the calculating means and a threshold value for determining whether or not a finger or the like is pinched in the vehicle window. comparing means for comparing the bets, when the calculated value of each relative to the time of the plurality of different past exceeds all threshold by comparison means, and pinching occurs It is composed of a cross-sectional determining means, when it is determined that the pinching occurs, is obtained by the driving of the motor so as to be or reversed stopped.
[0005]
In this configuration, the motor current value or the motor rotation speed at a plurality of different past times is compared with the current motor current value or the motor rotation speed, and the plurality of current differences or the rotation speed differences are all equal. If the threshold value is exceeded, it is determined that pinching of a finger or the like has occurred, and driving of the vehicle window is stopped. Therefore, when the current value flowing through the motor or the rotation speed of the motor always swings largely up and down, such as when traveling on a rough road, a plurality of current differences or speed differences may occur unless actual pinching actually occurs. All of them do not exceed the threshold value, thereby reducing erroneous detection when traveling on a rough road. In addition, it is possible to correctly determine whether or not pinching has occurred without setting a high threshold value, and it is possible to reduce the pinching detection load. Further, since it is possible to determine whether the vehicle is traveling on a rough road and the state of being pinched with the same configuration as before, there is no need to change the system.
[0006]
Further, in the present invention, a threshold value for determining whether or not the entrapment has occurred may be variable. In this configuration, since the threshold value can be changed according to the use situation, it is possible to appropriately balance prevention of erroneous detection of entrapment when traveling on a rough road and reduction of the load at the time of detection of entrapment.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below 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
[0008]
When the user operates the knob 3a of the power window switch 3 and gives 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 is input to the CPU ( (Control means) 8. The CPU 8 drives the motor 4 via the output unit 9 based on the input knob information. Further, the CPU 8 captures the motor current value or the motor speed value, determines whether or not a foreign object is being caught in the vehicle window 2 based on the motor current value or the motor speed value. Or reverse it. A CPU for calculating a current difference or a speed difference, which will be described later, for determining whether or not a pinching state has occurred; a comparing unit for determining whether a pinching has occurred based on the calculating unit; The determining means is constituted. The processing method will be described in detail below.
[0009]
FIGS. 3A and 3B show a state in which a vehicle equipped with the power window switch device 1 according to the present embodiment is traveling on a paved road or the like (hereinafter, referred to as a normal state), and traveling on a rough road. FIG. 3 is a diagram showing changes in the voltage of the motor 4, the current flowing in the motor 4, and the rotation speed of the motor 4 when the power window switch device 1 is operated in a state where the power window switch device 1 is operating (hereinafter referred to as a rough road state). As shown in FIG. 3A, the values of the voltage, current, and rotation speed 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 is constant. Decreases, the current increases, and the rotation speed decreases. In a rough road condition, the current, the voltage, and the rotation speed always fluctuate up and down.
[0010]
FIGS. 4A and 4B show changes in motor voltage and current when the power window switch device 1 is used in a normal state and a rough road state, and FIGS. 5A and 5B show a change in the normal state. FIG. 4 is a diagram illustrating changes in motor voltage and rotation speed when the power window switch device 1 is used in a rough road condition. As described above, the conventional pinch state detection method compares the current value or the rotation speed with a predetermined time (for example, 100 ms) and the current current value or the rotation speed, and obtains the current difference or the speed obtained by the comparison. If the difference (calculated value) is equal to or greater than a preset threshold value, it is determined that the object is in a pinching state. Therefore, even if the current difference or the speed difference becomes larger than the threshold value by accident when the vehicle is running on a rough road or the like, the jamming state may be erroneously determined and an instruction to stop the motor 4 may be issued. Was.
[0011]
The detection method using the power window switch device 1 of the present invention compares a current value before a plurality of predetermined times with a current current value, and a plurality of current differences obtained by the comparison are continuously greater than or equal to a threshold value. If so, it is determined that the object is in a pinched state. As can be seen from FIGS. 5A and 5B, when the current waveforms in the rough road state and the normal state are compared, there is always a swing in the rough road state. Therefore, the difference between the current value and the current values before 50 ms (t ₁ ), 100 ms (t ₂ ), and 150 ms (t ₃ ) is obtained, and these current differences ΔI ₁ , ΔI ₂ , ΔI ₃ and a predetermined value are calculated. comparing the threshold value _{I t,} all current difference ΔI _1, ΔI _2, ΔI ₃ is if exceeds the threshold value _{I t,} it is determined that the pinching state. In rough road condition of FIG. 4 (b), although the current difference [Delta] I ₂ is beyond the threshold value _{I t,} current difference [Delta] I _1, since [Delta] I ₃ does not exceed the threshold value _{I t,} and pinching state Is not determined, and erroneous detection can be prevented. In addition, since detection is performed in this manner, even if the threshold value is set relatively low, erroneous detection is less likely to occur, so that the load of pinch detection is reduced, and pain may be felt when fingers are pinched. It has a softening effect. The threshold value may be appropriately changed according to the device and the use situation.
[0012]
As shown in FIGS. 5A and 5B, the differences ΔV ₁ , ΔV ₂ , and ΔV ₃ between the current speed of the motor (pulse cycle and the like) and the speed before a predetermined time are compared with threshold values. Thus, it may be possible to determine whether or not the vehicle is in a pinched state. In this case, similarly to the case of detecting the pinched state based on the current value, erroneous detection in a rough road state can be prevented. In the above-described conventional method, for example, since the entrapment determination is performed by checking only ΔI ₂ (or ΔV ₂ ) 100 ms before, an erroneous detection is performed.
[0013]
Next, the operation of the CPU 8 of the power window switch device 1 for judging the pinching state will be described with reference to the flowchart of FIG. The CPU 8 stores the data of the current value every fixed time (50 ms in FIG. 4). When a change occurs in the current value, the current difference ΔI ₁ between the current value and the current value 50 ms before is compared with a fixed value (threshold value I _t ), and this current difference ΔI ₁ is determined by the threshold value I _t during larger (YES at S1), a current difference [Delta] I ₂ between the present current value and 100ms previous current value is compared with a threshold _{I t.} A current difference [Delta] I ₃ of the current difference [Delta] I ₂ is the time greater than the threshold value _{I t} and (YES at S2), further the current of the current value and 150ms previous current value is compared with a threshold _{I t,} the during current difference [Delta] I ₃ is greater than the threshold I _t (in S3 YES), it is determined that entrapment state (S4), issues an instruction to stop or reverse rotation driving of the motor 4. S1, S2, step S3 any one of the steps of its current difference [Delta] I _1, [Delta] I _2, if [Delta] I ₃ is smaller than the threshold value _{I t} (S1, S2, NO in S3), judgment that entrapment state (S5) This can prevent erroneous detection in traveling on a rough road. Note that the determination of the entrapment state may be made based on the difference between the rotation speeds of the motors (ΔV ₁ , ΔV ₂ , ΔV ₃ in FIG. 6). In this case, the same operation and effect as the determination based on the current value can be obtained. it can.
[0014]
【The invention's effect】
As described above, according to the present invention, the difference between the current value or the rotation speed of the motor at a plurality of different past times and the current current value or the rotation speed is calculated, and the plurality of current differences or the speed differences are calculated. If all of them are equal to or greater than the entrapment detection threshold value, it is determined that an entrapment state has occurred, and the driving of the motor is stopped or reversely rotated. Therefore, when the current value or the speed constantly fluctuates up and down, such as when driving on a rough road, it is possible to reduce the possibility of erroneous pinch detection, and to perform the correct detection without setting the pinch detection threshold high. Since the load can be reduced, the load for detection of pinching can be reduced, and the pain felt when a finger is pinched can be reduced. Further, it is possible to determine whether the vehicle is running on a rough road or the like and the state of being pinched with the same configuration as before, so that there is no need to change the system.
[0015]
Further, according to the present invention, by making the entrapment detection threshold variable, it is possible to more accurately determine the entrapment state by changing the threshold in accordance with the use situation and the like. The load at the time of detection can be reduced as much as possible.
[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 and a rotation speed in a normal state, and FIG. 3B is a diagram illustrating changes in motor voltage and current and a rotation speed in a rough road state. .
FIG. 4A is a diagram illustrating changes in motor voltage and current in a normal state, and FIG. 4B is a diagram illustrating changes in motor voltage and current in a rough road state.
FIG. 5A is a diagram illustrating changes in motor voltage and rotation speed in a normal state, and FIG. 5B is a diagram illustrating changes in motor voltage and rotation speed in a rough road state.
FIG. 6 is a flowchart of a determination operation of a pinching 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 (control means; calculation means, comparison means, judgment 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 or a speed value of the motor being taken in. A power window switch device comprising a control means for controlling the operation,
The control means,
Calculating means for calculating a difference between the motor current value or the motor speed at the current time and the motor current value or the motor speed at a time earlier than the current time, for a plurality of different past times ,
Comparing means for comparing a value calculated by the calculating means with a threshold value for determining whether or not a finger or the like has been pinched in the vehicle window;
When all the calculated values for the plurality of different past times exceed the threshold value by the comparing unit, the comparing unit is configured to determine that the entrapment has occurred. A power window switch device which is stopped or reversed. The power window switch device according to claim 1, wherein a threshold value for determining whether or not the entrapment has occurred is variable.

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