JPH0596372U - Power window safety equipment - Google Patents

Abstract

(57) [Summary] [Purpose] The safety control operation release area provided to prevent false detection of entrapment of foreign matter near the fully closed position of the power window is substantially expanded due to changes over time, etc. It is prevented that the control operation is not executed. [Structure] Drive source 2 for opening and closing a vehicle window
And a pulse generator 3 for generating a pulse signal according to the operation of the drive source, and a counter for counting the pulse signal. The open / close position of the window is detected based on the count value of the counter, and the window is Means 12 for resetting the reference value of the counter when the drive source further operates in the closing direction in the state of detecting the fully closed state, and the safety control operation release area is always in the window of the reset reference value. It should be set within a predetermined range from the fully closed position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is applied to vehicles such as automobiles, and relates to a power window that opens and closes a window by a drive source such as a motor. Particularly, safety control is performed by detecting a state in which a hand or head is sandwiched between a window glass and a sash. The present invention relates to a safety device that operates.

[0002]

[Prior Art]

 Generally, in a power window, a window glass (window glass) is opened / closed by a motor or the like, which may cause an accident such that an occupant's hand or head is caught between the window glass and the sash (window frame). Therefore, a safety device has been conventionally used to prevent such accidents by detecting such a state that a foreign object is caught and stopping the opening / closing operation of the window or opening the window at that time. Proposed. For example, it detects the operating speed of the windshield and the motor that drives it, and detects the decrease in operating speed when the windshield entraps a foreign object to detect the entrapment of the foreign matter. By performing a safety control to force the operation, foreign matter is released from the pinch between the windshield and the sash.

[0003]

[Problems to be solved by the device]

 By the way, with such a method of detecting foreign matter trapped, when the wind glass comes into contact with the weather strip or the like provided on the sash in a state where the window is almost completely closed, the load on the drive source increases and the operating speed decreases. Therefore, there is a possibility that this decrease in operating speed may be erroneously detected as a foreign substance being caught. If such an erroneous detection occurs, safety control will be performed in a state close to the fully closed state of the window, and the window will not be completely closed. Therefore, the open / closed position of the window is always detected, and even when foreign matter is detected when the window is close to fully closed, the safety control operation is canceled to prevent malfunction, that is, false detection. It has already been proposed by the inventor.

However, if the weather strip is deformed or its elastic force is reduced due to deformation over time, the amount of movement of the wind glass is increased by that amount, and the fully closed position thereof is changed. In the safety device provided with the measures against malfunction as described above, the release area of the safety control operation is substantially expanded. For this reason, even in the area where the safety control operation is released, an accident such as a fingertip having a small thickness is likely to be caught, and there is a problem that the safety control operation is not performed at this time. An object of the present invention is to provide a safety device for a power window capable of correctly executing a safety control operation near the fully closed state of the window.

[0005]

[Means for Solving the Problems]

 The present invention is a drive source that opens and closes a window of a vehicle, a pulse generation unit that generates a pulse signal according to the operation of the drive source, and an opening and closing position of the window based on a count value of a counter that counts the pulse signal. And a means for resetting the reference value of the counter when the drive source further operates in the closing direction while detecting that the window is in the fully closed state. For example, the counter is set so that the count value becomes 0 when the window is fully closed, and when the count value becomes smaller than this, the count value is reset to 0 in that state.

[0006]

【Example】

 Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of the main part of the present invention. In the figure, 1 is a microcomputer for performing safety control, to which a pulse signal from a pulse signal generating means 3 attached to a motor 2 as a drive source of a power window is input. The motor 2 can open and close the window by vertically moving a window glass 5 by an opening / closing mechanism 4 including a gear train. When the motor 2 rotates normally, it closes and when it rotates reversely, it opens. Further, the opening / closing operation of the window is selected by the function switch 6, and the selection signal is input. On the other hand, a control signal is output from the microcomputer 1 to control the motor drive circuit 7 that controls the rotation direction of the motor 2.

As shown in FIG. 2, the pulse signal generating means 3 includes a circular magnet 8 fixed to a rotation shaft 2 a of a motor 2 and a circular magnet 8 surrounding the magnet 8 at different angular positions of 90 degrees. It is composed of a pair of Hall elements 3a, 3b arranged in the above, and the Hall elements 3a, 3b detect the magnetic pole of the magnet 8 to generate a current, thereby generating a pulse signal having a frequency corresponding to the rotation speed of the motor 2. Is output.

The microcomputer 1 is provided with a system for detecting a safety control area from the opened / closed state of the window and a system for detecting foreign matter entrapment. The means 11 for detecting the opening / closing direction of the window provided in the system for detecting the safety control area binarizes the pulse signals respectively output from the Hall elements 3a and 3b, and converts this into a 2-bit signal, By detecting the periodicity in which the 2-bit signal value changes, the rotation direction of the motor 2 is detected, and the opening / closing direction of the window associated therewith is detected. The open / close position detecting means 12 of the window is composed of, for example, an up / down counter, and when the wind glass is moved up most and the count value in the fully closed state of the window is initialized to 0, and the motor 2 is normally rotated. By counting the pulse signal in the negative direction and counting the pulse signal in the positive direction when the motor reverses, the open / close position of the window is detected by the count value.

The safety control area discrimination means 13 discriminates the area from the fully opened state of the window to the state immediately before the fully closed state based on the output of the window opening / closing position detection means 12, and the safety control is performed only in this area. To Here, of all the opening and closing processes of the window, about 90% of the open side area is the safety control area, and the remaining about 10% area is the safety control release area. In this release area, a system for detecting foreign matter trapping is detected. The signal from is invalidated. A part of the output of the safety control area determining means 13 is input to one input terminal of the AND gate 14, and the other part is input to the operation commanding means 15.

On the other hand, the foreign matter trapping detection system is provided with an absolute speed detection means, a relative speed detection means, and the like. The absolute speed detecting means 16 detects the interval time of the pulse signal to compare whether the rotation speed of the motor 2 for opening and closing the window, that is, whether the opening and closing operation speed is higher than a preset reference speed. .. Then, the first entrapment detection means 17 detects that the foreign matter is entrapped when the absolute speed becomes lower than the reference speed. Here, when the motor rotation speed is 20 ms / revolution or less, it is detected that the motor is in the pinching state.

Further, the relative speed detecting means 18 detects an interval time of continuous pulse signals, and detects a change in the opening / closing speed of the motor, that is, a relative speed from the relative ratio of each interval time. Then, the second entrapment detection means 19 detects that the foreign matter is entrapped when the relative speed falls below a certain value. Here, when the relative speed is reduced by 10% or more, the trapped state is detected.

The outputs of the first and second pinch detection means 17 and 19 are input to the input ends of the OR gate 20, and the output of the OR gate is input to the other input end of the AND gate. Further, the output of the AND gate 14 is input to the safety control operation commanding means 21, and the safety control operation commanding means 21 controls the operation commanding means 15 to perform the safety control operation when the entrapment detection signal is input. Let Here, control is performed so that the window glass is moved in the direction of opening by 12 cm from the open / closed position at that time. Needless to say, a signal from a function switch can be input to the operation command means 15 to rotate the motor forward or backward. The output of the operation command means 15 controls the rotation of the motor 2 via the motor drive circuit 7 including a relay switch.

According to the safety device having such a configuration, when the motor 2 starts to rotate, pulse signals are input to the microcomputer 1 from the Hall elements 3a and 3b of the pulse generating means 3, respectively. Then, the absolute speed detecting means 16 detects the signal interval of this pulse signal, and when the absolute speed detecting means 16 becomes larger than the reference speed of 20 ms, the first entrapment detecting means 17 outputs a foreign matter entrapment signal. Further, the relative speed detecting means 18 detects a change in the signal interval of the pulse signal, and when the relative speed is lower than the reference value, the second entrapment detecting means 19 outputs an entrapment signal of foreign matter.

On the other hand, the opening / closing direction detecting means 11 detects the rotation direction of the motor, that is, the opening / closing direction of the window using the pulse signal of each hall element, and the window opening / closing position detecting means 12 detects the motor from this opening / closing direction. It is determined whether or not it is forward rotation, and when it is forward rotation, the count value of the counter is incremented by -1, and when it is reverse rotation, the count value is incremented by +1. Next, the safety control area determination means 13 determines from the value of the counter whether the window opening / closing position is within the safety control area, and when it is within the safety control area, outputs a signal to the AND gate 14.

Then, each entrapment detection signal based on the absolute speed and the relative speed is input to the AND gate 14 through the OR gate 20, and the safety control operation commanding means through the AND gate 14 according to the signal from the safety control area determining means 13. 21 is input. The safety control operation command means 21 operates the operation command means 15 based on the input signal to execute the safety control operation. At the time of this safety control operation, the operation command means 15 reverses the energization polarity to the motor 2 via the motor drive circuit 7, and the motor is reversed to operate the window glass in a direction to open it by a predetermined amount (12 cm). Stop on top. As a result, the pinch is released and safety is ensured.

Here, as shown in FIG. 3A, in the initial stage, the weather strip 32 provided on the sash 31 maintains the shape shown in FIG. Is the position A in the figure. For this reason, the safety control operation release area is set on the basis of this position A, and the lower limit is the position B. In this release area, erroneous detection of entrapment can be avoided by the resistance when the windshield 5 contacts the weather strip 32. However, as shown in FIG. 3 (b), when the weather strip is deformed due to a change with time or the like, the fully closed position of the window glass 5 becomes a position slightly deviated to the sash side as shown by the position C in the figure. As it is, the safety control release area is in the range of B to C, which is substantially expanded. For this reason, if the safety control release area is set only based on the count value of the counter provided in the safety control area determination means 13 without taking this into consideration, the safety control release area may be set in the safety control release area as shown in FIG. There is a risk that an accident will be caught and the safety control operation at that time will not be executed.

Therefore, in the present invention, when the count value of the counter becomes 0 or less and the fully closed position of the window is deviated, the counter value is reset to 0 again. This operation is shown in the flowchart of FIG. That is, the window opening / closing position detecting means 12 detects the rotation direction of the motor (step S1) and then determines whether or not the motor is in the normal rotation (step S2). Since it is an opening operation, the count value is incremented by 1 (step S3). Further, in the case of normal rotation, it is judged whether or not the count value is 1 or more (step S4), and when it is 1 or more, that is, when the window is not in the fully closed state, the count value is decremented by 1 (step S5). When the count value is less than 1, immediately when it is 0 or less than 0, the window is at the fully closed position or when the fully closed position is deviated to the sash side due to deterioration of the weather strip described above, the count value is reset to 0 again. Reset (step S6) and reset the open / close position of the window to the fully closed position. After that, the safety control area is determined.

As a result, as shown in FIG. 3B, the fully closed position of the windshield 5 is corrected to the C position in response to the deterioration of the weather strip 32, and the safety control release area set based on the count value is set. Is always set from the fully closed position of the window to the D position of a predetermined size, and the release area is set to the range of D to C. In this example, the safety control release area is moved to the sash side as the weather strip deteriorates. Therefore, even when a fingertip or the like having a small thickness is sandwiched, this can always be detected, and the correct safety control operation can be executed.

[0019]

[Effect of the device]

 As described above, the present invention resets the reference value of the counter indicating the open / closed position of the window when the drive source further operates in the closing direction even when it is detected that the window is fully closed. By resetting as the fully closed position, the area where the safety control operation is released can be set again following the change in the fully closed position of the window, and detection of trapping and safety control operation near the fully closed position of the window can be performed. There is an effect that can be done correctly.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a main part of a power window safety device according to the present invention.

FIG. 2 is a schematic configuration diagram of pulse signal generation means.

FIG. 3 is a cross-sectional view of an upper portion of the window showing a safety control operation release area.

FIG. 4 is a flowchart showing an operation of a window opening / closing position detecting means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microcomputer 2 Motor 3 Pulse generating means 5 Window glass 11 Opening / closing direction detecting means 12 Opening / closing position detecting means 13 Safety control area determining means 16 Absolute speed detecting means 18 Relative speed detecting means 21 Safety control operation commanding means

Claims (2)

[Scope of utility model registration request] 1. A drive source for opening and closing a window of a vehicle, pulse generating means for generating a pulse signal according to the operation of the drive source, and a count value of a counter for counting the pulse signal based on the count value of the window. And a means for resetting the reference value of the counter when the drive source further operates in the closing direction in a state in which it is detected that the window is in the fully closed state. Safety equipment for power windows. 2. The counter is set so that the count value becomes 0 in the fully closed state of the window, and when the count value becomes smaller than this, the count value is reset to 0 in that state. Power window safety device.