JP2017128936A - Tuck-down prevention device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tuck-down prevention device for a vehicle which is excellent in operability while preventing the tuck-down of foreign matters.SOLUTION: A tuck-down prevention device for a vehicle comprises; a motor; an electrode arranged at an upper edge of a window pane; a capacitance detection circuit for detecting the capacitance of the electrode; and a motor control part for controlling the motor on the basis of the capacitance which is detected by the capacitance detection circuit. The tuck-down prevention device also comprises: a determination part which detects an approach of foreign matters to the electrode on the basis of a comparison of the capacitance and a first threshold Cth1, and detects the contact of the foreign matters with the electrode on the basis of a comparison of the capacitance and a second threshold Cth2; and the motor control part which controls the motor so that a window pane is ascended at a normal speed Vo until the capacitance exceeds the first threshold on the basis of a detection signal outputted from the determination part, an ascending speed of the window pane is decreased lower than the normal speed in a range in which the capacitance exceeds the first threshold, and does not exceeds the second threshold, and the window pane is descended when the capacitance exceeds the second threshold.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle pinching prevention device that is provided in a power window device mounted on a vehicle and prevents foreign matter from being pinched between a window glass and a window frame.

  Some power window devices that can raise and lower the window glass by the driving force of the motor include an anti-pinch device that prevents the human body and other foreign objects from being caught between the upper edge of the window glass and the window frame.

  As one type of pinching prevention device, an electrode is provided on the upper edge of the window glass, and based on an increase in the capacitance of the electrode, the contact of a foreign object to the upper edge of the window glass or the approach of a foreign object is detected. There is something.

  In such an anti-pinch device, for example, when the electrostatic capacity of the electrode on the upper edge of the window glass increases while the window glass is raised, it detects that there is a foreign object near the upper edge of the window glass and raises the window glass. To stop. Further, when a foreign object comes into contact with the upper edge of the window glass, the motor is inverted for a predetermined time to operate to lower the window glass. Such an operation prevents foreign matter from being caught between the upper edge of the window glass and the window frame.

  Patent Document 1 discloses a pinching detection device that improves the pinching detection accuracy based on a change in electrostatic capacitance accompanying the rise of the window glass and a load change of a motor that raises the window glass. .

  In Patent Document 2, when a vehicle door panel is closed and closed, a sensor provided at an edge of the door panel detects a capacitance that changes in accordance with a proximity state with a foreign object by using two types of thresholds. An opening / closing device that controls to reduce or reverse the moving speed of the door panel according to the proximity state is disclosed.

  Patent Document 3 discloses an object detection device that can change the sensitivity of an electric field measurement unit by measuring the capacitance between any two of three or more electrodes.

JP 2009-256990 A JP 2009-256906 A JP 2011-240775 A

  In the pinching prevention device as described above, when a foreign object comes into contact with the upper edge of the window glass or the foreign object comes close to the upper edge during the upward movement of the window glass, the motor reverses and the window glass is lowered. Accordingly, when the window glass is closed and closed, it is necessary to operate the operation switch again to raise the window glass, which makes the closing operation complicated.

  In the detection devices disclosed in Patent Documents 1 to 3, when a foreign substance comes into contact with or is close to the upper edge of the window glass or the edge of the door panel and the electrostatic capacitance exceeds a predetermined threshold value, the motor performs a reverse operation. Accordingly, when performing the closing operation, it is necessary to remove the foreign matter and then operate the operation switch again to raise the window glass or move the door panel.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle pinching prevention device having excellent operability while preventing foreign objects from being pinched.

  A vehicle squeezing prevention device that solves the above problems includes a motor that drives a window glass of a vehicle to move up and down, an electrode provided on an upper edge of the window glass, and a capacitance detection circuit that detects a capacitance of the electrode. In a vehicle pinching prevention device including a motor control unit that controls the motor based on the capacitance detected by the capacitance detection circuit, the capacitance is compared with a first threshold value. And a determination unit that detects the proximity of the foreign matter to the electrode and detects the contact of the foreign matter to the electrode based on a comparison between the capacitance and a second threshold, and is output from the determination unit. Based on the detected signal, the window glass is raised at a normal speed until the capacitance exceeds the first threshold, and the capacitance exceeds the first threshold and exceeds the second threshold. The window glass ascending speed is not in the range Was lower than the normal speed, when the capacitance exceeds the second threshold value, characterized in that it comprises a motor control unit that controls the motor so as to lower the window glass.

  With this configuration, the window glass rises at a normal speed until the capacitance of the electrode exceeds the first threshold, and in the range where the capacitance exceeds the first threshold and does not exceed the second threshold, When the rising speed is reduced and the capacitance exceeds the second threshold, the window glass is lowered.

  Further, in the above-described vehicle squeezing prevention device, a window position counter for detecting the raising / lowering position of the window glass and a plurality of divisions in which the window glass raising / lowering range is divided in the vertical direction based on an output signal of the window position counter. When the area setting unit to be set as an area and the window glass are located in the lower divided area, the window glass is controlled based on the first threshold value and the second threshold value, and the window glass becomes the upper divided area. When located, it is preferable to include a main control unit that controls the window glass only based on the second threshold value.

  With this configuration, when the window glass is located in the lower divided area, the rising operation of the window glass is controlled based on the first threshold value and the second threshold value, and when the window glass is located in the upper divided area, The window glass is controlled only based on the threshold.

  Further, in the above-described vehicle pinching prevention device, when the window glass is positioned in the lower divided region, the motor control unit stops the window glass from rising when the capacitance exceeds the second threshold value. It is preferable to make it.

With this configuration, when the window glass is positioned in the lower divided region, the rising of the window glass is stopped only when the capacitance exceeds the second threshold value.
Moreover, in said vehicle pinching prevention device, it is preferable to set the boundary between the lower divided region and the upper divided region at the center of the window glass raising / lowering range.

With this configuration, the boundary between the lower divided region and the upper divided region is set at the center of the window glass raising / lowering range.
Moreover, in the above-described vehicle pinching prevention device, the determination unit sets the first threshold value in a plurality of stages, and the main control unit raises the window glass every time the capacitance exceeds each threshold value. It is preferable to switch the speed sequentially.

  With this configuration, the rising speed of the window glass is sequentially reduced every time the capacitance exceeds each of the first threshold values of a plurality of stages.

  According to the vehicle pinching prevention device of the present invention, it is possible to improve operability while preventing foreign objects from being pinched.

The schematic diagram which shows the pinching prevention apparatus for vehicles. Explanatory drawing which shows operation | movement of the pinching prevention apparatus for vehicles. The flowchart which shows operation | movement of the pinching prevention apparatus for vehicles. Explanatory drawing which shows operation | movement of the pinching prevention apparatus for vehicles. The flowchart which shows operation | movement of the pinching prevention apparatus for vehicles.

  Hereinafter, an embodiment of a power window device including a vehicle pinching prevention device will be described with reference to the drawings. In the vehicle power window device shown in FIG. 1, for example, the window glass 3 of the front door is raised and lowered within the window frame based on the driving force of the motor 2 controlled by the motor control unit 1. The motor control unit 1 includes a drive circuit that supplies a drive current to the motor 2.

An operation switch (not shown) of the power window device is connected to the motor control unit 1, and the operation of the motor 2 is controlled based on an operation signal output from the operation switch.
An electrode 4 is attached to the upper edge of the window glass 3, and one end of the electrode 4 is electrically connected to the capacitance detection circuit 5 via a connection line 6. The capacitance C of the electrode 4 increases when the window glass 3 rises and approaches or comes into contact with the window frame, or when a foreign object such as a human body approaches or comes into contact.

As shown in FIG. 2, the capacitance detection circuit 5 includes a first threshold value Cth1 and a second threshold value Cth2 in two stages in order to detect an increase in the capacitance C of the electrode 4.
The first threshold value Cth1 is a threshold value for detecting that a foreign object or window frame has approached the upper edge of the window glass 3. When the foreign object or window frame approaches within a preset distance, The electric capacity C is set to exceed the first threshold Cth1.

When the capacitance C exceeds the first threshold Cth1, the capacitance detection circuit 5 outputs the first detection signal dt1 to the motor control unit 1.
The second threshold value Cth2 is a threshold value for detecting that a foreign object has contacted the upper edge of the window glass 3, and when the foreign object contacts, the capacitance C of the electrode 4 exceeds the second threshold value Cth2. Is set.

When the capacitance C exceeds the second threshold Cth2, the capacitance detection circuit 5 outputs a second detection signal dt2 to the motor control unit 1.
A window position counter 7 is connected to the motor control unit 1. The window position counter 7 accumulates the rotation angle of the motor and outputs the accumulated value to the motor control unit 1. The motor control unit 1 recognizes the position of the window glass 3 within the lifting range based on the output signal of the window position counter 7.

The motor control unit 1 controls the operation of the motor 2 based on the first detection signal dt1 and the second detection signal dt2 output from the capacitance detection circuit 5.
As shown in FIG. 2, when the electrostatic capacity C of the electrode 4 exceeds the first threshold Cth1 and the first detection signal dt1 is input during the closing operation of the window glass 3, the motor control unit 1 displays the window glass. 3 is reduced.

  In addition, when a foreign object comes into contact with the upper edge of the window glass 3 and the second detection signal dt2 is input, the motor control unit 1 reverses the motor 2 to lower the window glass 3. After the window glass 3 is lowered, if the capacitance C falls below the second threshold value Cth2, the window glass 3 is again driven to rise at a low speed, and if the capacitance C falls below the first threshold value Cth1, The glass 3 is driven to rise at the normal speed Vo.

Next, the operation of the pinching prevention device configured as described above will be described.
[First control action]
As shown in FIG. 3, when the closing operation is started by operating the operation switch of the power window device, the motor control unit 1 drives the window glass 3 to rise at the normal speed Vo (step 1). Here, it is detected whether or not the electrostatic capacitance C of the electrode 4 exceeds the first threshold value Cth1 (step 2), and if not, the ascending drive at the normal speed Vo is continued.

  If the capacitance C of the electrode 4 exceeds the first threshold value Cth1 in step 2, whether or not the window glass 3 has risen to the vicinity of the window frame based on the output signal of the window position counter 7, that is, the window It is detected whether or not the electrostatic capacity C exceeds the first threshold value Cth1 due to the upper edge of the glass 3 being close to the window frame (step 3).

  If it is determined in step 3 that the window glass 3 has not risen to the vicinity of the window frame based on the output signal of the window position counter 7, the motor control unit 1 indicates that a human body or other foreign matter has approached the upper edge of the window glass 3. It determines with the electrostatic capacitance C increasing, and raises the raising speed V of the window glass 3 (step 4).

If the capacitance C of the electrode 4 exceeds the first threshold Cth1 and does not exceed the second threshold Cth2, the window glass 3 is raised at a low speed (steps 2 to 5).
In step 5, when a human body or other foreign object comes into contact with the upper edge of the window glass 3 and the capacitance C of the electrode 4 exceeds the second threshold Cth2, the motor control unit 1 sets the capacitance C to the second capacitance Cth2. The motor 2 is reversed until it falls below the threshold value Cth2, and the window glass 3 is lowered (steps 5 and 6). In steps 5 and 6, the window glass 3 may be controlled to be lowered only by a certain amount.

  When the electrostatic capacity C falls below the second threshold value Cth2 and is larger than the first threshold value Cth1 due to the lowering of the window glass 3, the process proceeds to step 4 to return to a state where the window glass 3 is raised at a low speed.

Furthermore, when the electrostatic capacitance C falls below the first threshold value Cth1 in step 2, the process proceeds to step 1 and the window glass 3 is driven to rise at the normal speed Vo.
If the window glass 3 has risen to the vicinity of the upper limit in step 3, the process proceeds to step 7 and the window glass 3 is raised to the upper limit at a low speed regardless of the capacitance C of the electrode 4. Here, the vicinity of the upper limit is a case where the window glass 3 is raised to a position where there is no possibility of foreign matter such as a human body being sandwiched between the upper edge of the window glass 3 and the window frame.
[Second control action]
In the pinching prevention device as described above, the following control can be set.
As shown in FIG. 4, different control is performed in the lower half first area A and the upper half second area B in the raising and lowering range of the window glass 3, and the first area A and the second area. B is recognized by the motor control unit 1 based on the output signal of the window position counter 7.

  In the first region A, when the capacitance C of the electrode 4 exceeds the first threshold Cth1, the motor control unit 1 raises the window glass 3 at a low speed, and when it exceeds the second threshold Cth2, Stop the ascending motion.

In the second region B, when the electrostatic capacitance C of the electrode 4 exceeds the second threshold value Cth2, the motor control unit 1 performs control so that the window glass 3 is lowered.
A specific control operation will be described with reference to FIG.
When the closing operation is started by operating the operation switch of the power window device, the motor control unit 1 determines whether the upper edge of the window glass 3 is located in the first region A based on the output signal of the window position counter 7. It is determined whether it is located in the second region B (step 11).

  When the upper edge of the window glass 3 is located in the first region A, the motor control unit 1 proceeds to step 12 and raises the window glass 3 at the normal speed Vo. And it is discriminate | determined whether the electrostatic capacitance C of the electrode 4 exceeds 1st threshold value Cth1 (step 13), and when not exceeded, the raise control at normal speed Vo is continued (steps 11-13). .

  When the electrostatic capacitance C of the electrode 4 exceeds the first threshold value Cth1 in step 13, that is, when any foreign matter comes close to the upper edge of the window glass 3, the process proceeds to step 14 to It is determined whether or not the capacitance C exceeds the second threshold Cth2.

  If the capacitance C of the electrode 4 exceeds the second threshold value Cth2 in step 14, the motor control unit 1 detects that a foreign object has contacted the upper edge of the window glass 3, and stops the operation of the motor 2. Then, the rising of the window glass 3 is stopped (step 15), and the control operation is terminated.

  When the electrostatic capacity C does not exceed the second threshold value Cth2 in step 14, since the foreign matter is not yet in contact, the motor control unit 1 raises the window glass 3 at a low speed and proceeds to step 13. When the capacitance C of the electrode 4 exceeds the first threshold value Cth1 and does not exceed the second threshold value Cth2, the state of increasing at a low speed is continued (steps 13, 14, and 16).

Moreover, if the electrostatic capacitance C of the electrode 4 returns to a state below the first threshold value Cth1, the window glass 3 is returned to a state where it is raised at the normal speed Vo (steps 11 to 13).
If the upper edge of the window glass 3 is located in the second region B in step 11, the motor control unit 1 moves to step 17 and raises the window glass 3 at the normal speed Vo. If the window glass 3 has not yet reached the vicinity of the upper limit, it is determined whether or not the capacitance C exceeds the second threshold value Cth2 (steps 18 and 19).

If the electrostatic capacity C exceeds the second threshold value Cth2 in step 19, the motor control unit 1 reverses the motor 2 and lowers the window glass 3 for a predetermined time, and then ends the control operation.
If the electrostatic capacity C does not exceed the second threshold value Cth2 in step 19, the process returns to step 17, and the motor control unit 1 raises the window glass 3 at the normal speed (steps 17 to 19).

Moreover, when the window glass 3 is rising to the upper limit vicinity in step 18, it transfers to step 21 and raises the window glass 3 to an upper limit at low speed.
In the pinching prevention device as described above, the following effects can be obtained.
(1) The window glass 3 is raised at a normal speed until the capacitance C of the electrode 4 provided on the upper edge of the window glass 3 exceeds the first threshold value Cth1, and the capacitance C is set to the first threshold value Cth1. In the range from to the second threshold Cth2, the window glass 3 is raised at a low speed, and when the capacitance C exceeds the second threshold Cth2, the raising of the window glass 3 can be stopped or lowered.
(2) When a foreign substance comes close to the upper edge of the window glass 3 and the capacitance C of the electrode 4 exceeds the first threshold value Cth1, the window glass 3 can be raised at a low speed.
(3) When a foreign substance comes into contact with the upper edge of the window glass 3 and the capacitance C of the electrode 4 exceeds the second threshold value Cth2, the window glass 3 can be stopped or lowered. Therefore, it is possible to prevent foreign matter from being caught between the window glass 3 and the window frame.
(4) When the first control operation is set, the state in which the window glass 3 is raised at a normal speed, the state in which the window glass 3 is raised at a low speed, and the state in which the window glass 3 is lowered are automatically switched according to the change in the capacitance C. be able to. Accordingly, when the contact or proximity of the foreign matter to the upper edge of the window glass 3 is released, the window glass 3 can be automatically returned to the state of being raised at the normal speed, so that the operability can be improved. .
(5) When the second control operation is set, when the capacitance C of the electrode 4 exceeds the first threshold value Cth1 in the first region A, the window glass 3 is raised at a low speed, and the second threshold value Cth2 When exceeding, the raising of the window glass 3 can be stopped. Then, an occupant of the vehicle intentionally brings a foreign object close to the upper edge of the window glass 3 to reduce the rising speed of the window glass 3, and further brings the foreign object into contact with the upper edge of the window glass 3. The ascent can be stopped. For this reason, since the passenger | crew can adjust the stop position of the window glass 3 finely, without operating an operation switch, operativity can be improved.
(6) When the second control operation is set, the window glass 3 can be lowered in the second region B when the capacitance C of the electrode 4 exceeds the second threshold value Cth2. Accordingly, it is possible to prevent foreign objects from being caught between the upper edge of the window glass 3 and the window frame.

In addition, you may change the said embodiment as follows.
-When the electrostatic capacity C of the electrode 4 exceeds the first threshold Cth1 during the lowering operation of the window glass 3, the lowering speed may be controlled to increase.
-You may make it set the 1st threshold value Cth1 as a threshold value of several steps, and changes the raise speed of the window glass 3 in steps with each threshold value.

  DESCRIPTION OF SYMBOLS 1 ... Motor control part (area | region setting part), 2 ... Motor, 3 ... Window glass, 4 ... Electrode, 5 ... Electrostatic capacity detection circuit (determination part), 7 ... Window position counter, Cth1 ... 1st threshold value, Cth2 ... second threshold, C ... capacitance, A ... lower divided area (first area), B ... upper divided area (second area), Vo ... normal speed.

Claims (5)

A motor for raising and lowering the window glass of the vehicle;
An electrode provided on an upper edge of the window glass;
A capacitance detection circuit for detecting a capacitance of the electrode;
In the vehicle pinching prevention device including a motor control unit that controls the motor based on the capacitance detected by the capacitance detection circuit,
Based on the comparison between the capacitance and the first threshold, the proximity of the foreign matter to the electrode is detected, and based on the comparison between the capacitance and the second threshold, the contact of the foreign matter to the electrode. A determination unit for detecting
Based on the detection signal output from the determination unit, the window glass is raised at a normal speed until the capacitance exceeds the first threshold, and the capacitance exceeds the first threshold and the capacitance In a range that does not exceed the second threshold value, the window glass ascending speed is reduced below the normal speed, and when the capacitance exceeds the second threshold value, the motor is controlled to lower the window glass. And a motor control unit for the vehicle. The vehicle pinching prevention device according to claim 1,
A window position counter for detecting the raising and lowering position of the window glass;
An area setting unit that sets the window glass ascending / descending range as a plurality of divided areas based on the output signal of the window position counter,
When the window glass is located in the lower divided area, the window glass is controlled based on the first threshold value and the second threshold value, and when the window glass is located in the upper divided area, the second threshold value. And a motor control unit that controls the window glass only based on the vehicle. The vehicle pinching prevention device according to claim 2,
The said motor control part stops the raise of the said window glass, if the said electrostatic capacitance exceeds a said 2nd threshold value when the said window glass is located in a downward division area, The pinching prevention apparatus for vehicles characterized by the above-mentioned. The vehicle pinching prevention device according to claim 2 or 3,
A vehicle pinching prevention device characterized in that a boundary between the lower divided region and the upper divided region is set at the center of the raising / lowering range of the window glass. The vehicle pinching prevention device according to any one of claims 1 to 4,
The first threshold value is set in the determination unit in a plurality of stages, and the motor control unit sequentially switches the rising speed of the window glass every time the capacitance exceeds each threshold value. Anti-pinch device.

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