JPH06255369A - Automatic opening/closing device for door for vehicle - Google Patents

Abstract

PURPOSE:To provide an automatic opening and closing device for a vehicle door which can surely open and close the door in the manual operation, without carrying out the special manual/automatic selection operation. CONSTITUTION:An automatic opening/closing device for a back door is equipped with an opening/closing mechanism 8 which opens and closes the back door by supplying and discharging oil to a hydraulic cylinder 14 and a selector valve 24 which is installed in an oil feeding passage for the hydraulic cylinder 14 and opening/closing-drives the opening/closing mechanism 8 by selecting the oil supply/discharge direction, and the hydraulic pressure detecting sensors 26a and 26b for detecting the oil pressure in the hydraulic cylinder 1 are installed in the oil feeding tubes 10a and 10b. The manual opening/closing operation for the back door generates the variation of the hydraulic pressure in the hydraulic cylinder 14, which is detected by the hydraulic pressure detecting sensors 26a and 26b, and the back door is automatically opened and closed by allowing an ECU to switch a selector valve 24 to the opening drive or closing drive, according to the result of the above-described detection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle door automatic opening / closing apparatus for automatically opening and closing a vehicle door.

[0002]

2. Description of the Related Art Conventionally, an automatic door opening / closing apparatus for a vehicle, which uses a working fluid to open and close the door, has been known as an apparatus which allows the door to be opened and closed manually.
It is disclosed in Japanese Patent Application Laid-Open No. 3260, Japanese Patent Application Laid-Open No. 2-164995, and the like.

Among them, the vehicle door opening / closing device disclosed in Japanese Utility Model Publication No. 60-3260 is a door opening / closing mechanism using a double-acting cylinder that can be moved by fluid pressure in any of reciprocating directions. Open / close drive switching valve that supplies / discharges fluid to / from each cylinder's working chamber to expand / contract the piston rod, and working fluid supply route from the open / close drive switching valve to each working chamber A manual / automatic switching valve that shuts off the valve and connects the working chambers to each other is provided, and a manual opening / closing operation in the automatic opening / closing device is enabled by selectively switching these valves. In other words, in this vehicle door opening / closing device, the door is opened and closed by supplying / discharging working fluid to / from each working chamber of the cylinder through the opening / closing drive switching valve and the position at the time of automatic opening / closing of the hand / auto switching valve. The door is opened and closed, and during manual operation, the working fluid supply path is blocked by the hand / automatic switching valve to connect the working chambers so that the door can be opened and closed manually without being disturbed by the working fluid. .

On the other hand, the door opening / closing device disclosed in Japanese Patent Laid-Open No. 2-164995 is provided with a single-acting cylinder capable of supplying fluid pressure to only one side of the piston. In addition to the device that automatically opens and closes the pivoted door, a switch that detects the fully closed state of the door is provided, and this switch detects that the door has been slightly opened from the fully closed state by manual operation, The door is supposed to open automatically.

[0005]

[Problems to be Solved by the Invention]
The vehicle door opening / closing device disclosed in Japanese Patent No. 3260 has a problem in that when a manual opening / closing operation is performed, a dedicated changeover switch must be operated to switch the hand / automatic changeover valve.

On the other hand, in the door opening / closing device disclosed in Japanese Unexamined Patent Publication No. 2-164995, when a door that is not in the fully closed state is opened manually, the switch provided at the opening does not operate, and the manual operation cannot be detected. There was a problem that the automatic door opening control could not be activated. Also, in the case of this device, since a single-acting cylinder is used for the opening / closing mechanism, it is possible to lift it without resistance other than the dead weight of the door even if the opening control does not operate. Since the working fluid for operating the piston rod is not supplied to, the piston rod retracts due to the weight of the door when the hand is released from the door, and the door falls to the original position. Therefore, when the door that is not in the fully closed state is manually opened, there is a problem that the door must be supported by hand or fixed by a stopper.

In order to solve the above problems, the present invention provides
An object of the present invention is to provide an automatic door opening / closing device for a vehicle, which can surely open and close a door during a manual operation without performing a special manual / automatic switching operation.

[0008]

SUMMARY OF THE INVENTION The present invention, which has been made to achieve the above object, comprises a cylinder for expanding and contracting a piston rod by a working fluid supplied from the outside, as shown in FIG. An opening / closing mechanism for opening / closing the vehicle door by expanding / contracting the piston rod, an opening / closing drive means for supplying / discharging a working fluid to / from the cylinder to drive the opening / closing mechanism, and the opening / closing according to the opening / closing request of the door inputted from the outside. An automatic opening / closing device for a back door of a vehicle, comprising an opening / closing control means for opening / closing / driving / stopping the opening / closing mechanism by switching the supply / discharge direction of the working fluid by the driving means. Fluid pressure detection means for detecting the fluid pressure of the working fluid in the cylinder and the fluid pressure when the opening / closing control means stops the opening / closing mechanism. From the change in the fluid pressure detected by the output means, the manual opening / closing operation detecting means for detecting the manual opening / closing operation and the operating direction of the door, and the manual opening / closing operation of the door by the manual opening / closing operation detecting means are performed. When detected, a second opening / closing control means for switching the supply / discharge direction of the working fluid by the opening / closing drive means according to the operation direction to open / close the opening / closing mechanism is provided. Automatic door opening and closing device for vehicles.

[0009]

In the automatic door opening / closing apparatus of the present invention having the above-described structure, when the door opening / closing request is input from the outside, the opening / closing control means causes the opening / closing drive means to transfer the working fluid to the cylinder. The opening / closing mechanism is opened, closed, or stopped by switching the supply / discharge direction.

By the way, when the door is manually moved in the opening direction or the closing direction while the opening / closing control means is stopping the opening / closing mechanism, the fluid pressure in the cylinder constituting the opening / closing mechanism depends on the operating direction. Change. Therefore, in the vehicle door automatic opening / closing device of the present invention, the fluid pressure is detected by the fluid pressure detection means, and the manual opening / closing operation detection means is used.
When the opening / closing mechanism is stopped, the manual opening / closing operation of the door and its operating direction are detected from the change in the detected fluid pressure.

When the manual opening / closing operation detecting means detects the manual opening / closing operation of the door from the change in the fluid pressure, the second opening / closing control means follows the detected opening / closing operation direction of the door and operates the operating fluid by the opening / closing driving means. The opening / closing mechanism is driven to open or close by switching the supply / discharge direction of.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an explanatory view showing the entire back door opening / closing device in the one-box type automobile 2 to which the present invention is applied.

As shown in FIG. 2, the opening / closing device for the back door 4 in the one-box type automobile 2 of this embodiment is as follows.
An opening / closing mechanism 8 for opening and closing the back door 4 pivotally mounted at the upper end by a hinge 6 provided at the upper end of a rear opening (hereinafter, simply referred to as an opening) of the one-box type automobile 2.
And a power unit 12 that supplies oil for expanding and contracting the opening / closing mechanism 8 via an oil supply tube 10.
And an operating switch (hereinafter referred to as a driver switch) S1 of an opening / closing mechanism 8 having three contacts of open / neutral / close provided near the driver's seat, and a well-known microcomputer including a CPU, a ROM, a RAM, and the like. An electronic control unit (hereinafter, simply referred to as ECU) 13 that controls the power unit 12 based on inputs of the driver switch S1 and limit switches LS1 and LS2 that detect an open / closed state of a back door 4 described later. There is.

The opening / closing mechanism 8 has two working chambers, and can supply and discharge oil to and from the working chambers to move the hydraulic cylinder 14 in either direction, and a piston that expands and contracts in the axial direction of the hydraulic cylinder 14. The rod 16 and the V-shaped link member 18 are provided. One end of the V-shaped link member 18 has a piston rod 16 of the hydraulic cylinder 14.
Side end portion, and the tip end portion of the piston rod 16 is pivotally attached between the bending point of the link member 18 and the end portion pivotally attached to the hydraulic cylinder 14 and the opposite end portion. It is configured by

The opening / closing mechanism 8 is provided with a hydraulic cylinder 14
Of the V-shaped link member 18 is pivotally attached to the back door 4. The end of the V-shaped link member 18 is pivotally attached to the opening side edge of the one-box type automobile 2. As a result, it is attached to the one-box type automobile 2.

A rotating body (not shown) having a branch arm protruding from the hinge 6 is attached to the hinge 6.
A limit switch LS1 (not shown) is located at a position where the branch arm moves when the back door 4 is fully opened, and a limit switch (not shown) is located at a position where the branch arm moves when the back door 4 is fully closed. Each LS2 is provided.

In the opening / closing mechanism 8 thus constructed, when oil is supplied from the power unit 12 to the hydraulic cylinder 14 so that the piston rod 16 extends,
As the piston rod 16 extends and the V-shaped angle of the link member 18 increases, the back door 4 is opened. When the back door 4 is fully opened, a branch arm (not shown) provided on the hinge portion 6 abuts against a limit switch LS1 (not shown), and the limit switch LS1
Is turned on.

On the contrary, when oil is supplied from the power unit 12 to the hydraulic cylinder 14 so that the piston rod 16 retracts, the piston rod 16 contracts and the V-shaped angle of the link member 18 decreases, so that the back door is closed. 4 is closed. When the back door 4 is fully closed, a branch arm (not shown) provided on the hinge portion 6 contacts a limit switch LS2 (not shown), and the limit switch LS2 is turned on.

Next, the detailed configuration and operation of the power unit 12, which is the main part of the present invention, will be described. As shown in FIG. 3, the power unit 12 includes a hydraulic pump 20 that supplies oil to the hydraulic cylinder 14 of the opening / closing mechanism 8, an electric motor 22 that drives the hydraulic pump 20, and a hydraulic pump 2.
The tandem center valve is provided in the oil supply path from 0 to the hydraulic cylinder 14, and can selectively switch the oil supply to the hydraulic cylinder 14 between open drive, closed drive, and neutral. 4-port 3-position valve (hereinafter, simply referred to as switching valve) 24 and hydraulic cylinder 1
The oil supply tubes 10a and 10b connecting between the working chambers D and E of No. 4 and the switching valve 10 and the hydraulic pressures inside the working chambers D and E of the hydraulic cylinder 14 provided in the oil supply tubes 10a and 10b are detected. Oil pressure detection sensors 26a and 26b as fluid pressure detection means, and an oil removal valve 28 provided in the oil supply path and used when an abnormal pressure occurs.
It is composed of a and 28b and an oil reservoir tank 30.

The power unit 12 configured as described above
When the switching valve 24 is in the A position, that is, in a position where oil is supplied so that the hydraulic cylinder 14 is driven to open, when the electric motor 22 that drives the hydraulic pump 20 is energized by the control of the ECU 13, the switching valve 24 Through the oil supply tube 10a through the position A of the hydraulic cylinder 14
Oil is supplied to the D chamber. The supplied oil extends the piston rod 16, and the back door 4 opens with the hinge 6 as the center of rotation. At this time, the oil filled in the E chamber of the hydraulic cylinder 14 is returned to the reservoir tank 30 through the oil supply tube 10b through the position A of the switching valve 24 as the piston rod 16 advances.

Further, when the switching valve 24 is in the C position, that is, in the position for supplying the oil so that the hydraulic cylinder 14 is driven to be closed, when the electric motor 22 for driving the hydraulic pump 20 is energized by the control of the ECU 13, Oil is supplied to the E chamber of the hydraulic cylinder 14 through the C position of the switching valve 24 and the oil supply tube 10b. This supplied oil causes the piston rod 16 to retract, and the back door 4 closes with the hinge 6 as the center of rotation. At this time, the oil filled in the D chamber of the cylinder 4 is returned to the reservoir tank 30 of the power unit 12 through the C position of the switching valve 24 through the oil supply tube 10a as the piston rod 16 retracts.

On the other hand, when the switching valve 24 is in the B position, that is, in the position where the oil supply is stopped, the oil supply tubes 10a and 10b for supplying oil to the hydraulic cylinder 14 are interrupted at the B position of the switching valve 24. Since the oil is not supplied to the hydraulic cylinder 14 and the oil is not returned from the hydraulic cylinder 14 to the reservoir tank 30, the piston rod 16 is maintained as it is.
The back door 4 is also kept as it is.

Further, when a manual operation for opening the back door 4 is performed when the switching valve 24 is in the B position as described above, the back door 4 performs the opening operation with the hinge 6 as the center of rotation. I will try. Along with this, the link member 1
The V-shaped angle of 8 becomes large, and a force is applied in a direction to extend the piston rod 16, and the piston rod 16 tries to move forward in the X direction. At this time, the oil that is about to flow out from the E chamber of the hydraulic cylinder 14 to the oil supply tube 10b has the switching valve 24 in the B position, so that the reservoir tank 3
It cannot flow to the 0 side. Therefore, as the piston rod 16 advances, the pressure in the E chamber of the hydraulic cylinder 14 and the oil supply tube 10b increases. The increase in pressure inside the oil supply tube 10b is caused by the oil pressure detection sensor 26b.
Detected by.

Similarly, when the switching valve 24 is in the B position,
When a manual operation for closing the back door 4 is applied, the back door 4 attempts to perform the closing operation with the hinge 6 as the center of rotation. Along with this, the V-shaped angle of the link member 18 becomes smaller, a force is applied in a direction to retract the piston rod 16, and the piston rod 16 tries to retract in the Y direction. At this time, the oil that is about to flow from the D chamber of the hydraulic cylinder 14 to the oil supply tube 10a cannot flow to the reservoir tank 30 side because the switching valve 24 is at the B position. Therefore, as the piston rod 16 moves backward, the pressure in the D chamber of the hydraulic cylinder 14 and the oil supply tube 10a increases. The increase in pressure inside the oil supply tube 10a is detected by the oil pressure detection sensor 26a.

In the opening / closing device for the back door 4 configured as described above, the ECU 13 includes the driver switch S1, limit switches LS1 and LS2 (not shown) for detecting the fully open and fully closed states of the back door 4, and the hydraulic pressure detection. Signals from the sensors 26a and 26b are input, and the switching valve 24 of the power unit 12 is input from the ECU 13.
And the drive signal of the electric motor 22 that drives the hydraulic pump 20 of the power unit 12.

Next, the back door 4 performed in the ECU 13
The opening / closing control process of will be described with reference to the flowcharts shown in FIGS. In the initial state, the switching valve 24 is in the B position and the electric motor 22 that drives the hydraulic pump 20 is in the OFF state.

First, at step 110, the driver switch S1 in the driver's seat tries to close the back door 4 by "closing".
It is determined whether or not the mode is set. If the "closed" mode is not set, step 120
Proceed to. In step 120, it is determined whether or not the driver switch S1 on the driver's seat is set to the "open" mode in which the back door 4 is opened. If the "open" mode is set, the routine proceeds to step 130, where the opening control of the back door 4 is executed.

In step 130, it is determined whether or not the limit switch LS1 (not shown) provided on the hinge 6 and for detecting the fully opened state of the back door 4 is in the ON state. If the limit switch LS1 is not in the ON state, it is determined that the back door 4 is not fully opened,
Go to step 140.

In step 140, the power unit 12
The switching valve 24 is switched from the B position to the A position. In the next step 150, the hydraulic pump 20 of the power unit 12 is
The electric motor 22 for driving the motor is energized to start the supply of oil and the routine proceeds to step 160. At this time, the oil supplied from the hydraulic pump 20 is sent to the D chamber of the hydraulic cylinder 14 through the oil supply tube 10a via the switching valve A position, so that the piston rod 16 advances in the X direction to open the back door 4. To operate.

In step 160, it is determined whether or not the driver switch S1 on the driver's seat is set to the "open" mode in which the back door 4 is opened. If the mode is set to the "open" mode, it is determined that there is no request to cancel the opening control during the opening control of the back door 4, and the process proceeds to step 170.

In step 170, it is determined whether or not the limit switch LS1 (not shown) provided on the hinge 6 and for detecting the fully opened state of the back door 4 is in the ON state. If the limit switch LS1 is ON,
It is determined that the back door 4 is fully opened, and the process proceeds to step 180 to end the opening control.

In step 180, the power unit 12
The switching valve 24 is switched from the A position to the B position. Thereafter, in step 190, the power supply to the electric motor 22 that drives the hydraulic pump 20 of the power unit 12 is cut off, and the back door 4
To complete the opening control. At this time, since the switching valve 24 is switched to the B position, the supply of oil to the D chamber of the hydraulic cylinder 14 is stopped, so that the opening operation of the back door 4 is stopped and the back door 4 is held in the fully opened state. .

In step 130, a limit switch L (not shown) for detecting the fully opened state of the back door 4 is detected.
If S1 is in the ON state, it is determined that the back door 4 has already been fully opened, and the process is ended without performing the opening control. Therefore, the back door 4 is held in the fully opened state.

If the driver switch S1 in the driver's seat is set to the "closed" or "stopped" mode in the previous step 160, a request to cancel the opening control during the opening control of the back door 4 is issued. When it is determined that the back door 4 is opened, the control is moved to step 180 and the opening control of the back door 4 is stopped. Therefore, the back door 4 is stopped and held on the spot.

If the limit switch LS1 (not shown) for detecting the fully opened state of the back door 4 is not in the ON state in the previous step 170, it is judged that the back door 4 is not yet fully opened, and the control is returned to step 160. ,
The opening control is continuously executed. That is, the opening operation of the back door 4 is continued.

If the driver switch S1 in the driver's seat is set to the "closed" mode in which the back door 4 is to be closed in the previous step 110, step 200
Then, the process proceeds to step S4 to execute the closing control of the back door 4. In step 200, it is determined whether or not the limit switch LS2 (not shown) provided on the hinge 6 and for detecting the fully closed state of the back door 4 is in the ON state. If it is not in the ON state, it is determined that the back door 4 is not fully closed, and the process proceeds to step 210.

In step 210, the switching valve 24 of the power unit 12 is switched from the B position to the C position. In the next step 220, the electric motor 22 that drives the hydraulic pump 20 of the power unit 12 is energized to start the supply of oil, and the routine proceeds to step 230. At this time, the oil supplied from the hydraulic pump 20 is fed into the E chamber of the hydraulic cylinder 14 through the oil supply tube 10b via the switching valve C position, so that the piston rod 16 retracts in the Y direction,
The back door 4 is closed.

At step 230, it is determined whether or not the driver switch S1 on the driver's seat is set to the "close" mode in which the back door 4 is closed. If the "closed" mode is set, it is determined that there is no request to cancel the closing control during the closing control of the back door 4, and the process proceeds to step 240.

In step 240, it is determined whether or not the limit switch LS2 (not shown) provided on the hinge 6 and for detecting the fully closed state of the back door 4 is in the ON state. If the limit switch LS2 is in the ON state,
It is determined that the back door 4 is fully closed, and the process proceeds to step 250 to end the closing control.

In step 250, the switching valve 24 of the power unit 12 is switched from the C position to the B position. After that, in step 260, the power supply to the electric motor 22 for driving the hydraulic pump 20 of the power unit 12 is cut off to stop the oil supply, and the closing control of the back door 4 is completed. At this time, since the switching valve 24 is switched to the B position, the supply of oil to the E chamber of the hydraulic cylinder 14 is stopped, so that the closing operation of the back door 4 is stopped and the back door 4 is held in the fully closed state. It

In step 200, the limit switch L (not shown) for detecting the fully closed state of the back door 4 is detected.
If S2 is in the ON state, it is determined that the back door 4 is already fully closed, and the process is ended without performing the closing control. Therefore, the back door 4 is held in the fully closed state.

If the driver switch S1 on the driver's seat is set to the "open" or "stop" mode in step 230, the closing control is attempted to be stopped during the closing control of the back door 4. When it is judged that there is a request, the control is moved to step 250 and the closing control of the back door 4 is stopped. Therefore, the back door 4 is stopped and held on the spot.

If the limit switch LS2 (not shown) for detecting the fully closed state of the back door 4 is not in the ON state at the previous step 240, it is judged that the back door 4 is not yet fully closed, and the process returns to step 230. Then, the closing control is continuously executed. That is, the closing operation of the back door 4 is continued.

Next, at step 120, if the driver switch S1 on the driver's seat is in the "neutral" mode,
Proceeding to step 265, the manual opening / closing control process shown in FIG. 5 is executed. As shown in FIG. 5, in step 270, it is determined whether the pressure detected by the pressure detection sensor 10b has risen. If the detected pressure is increased, it is determined that there is an external operation to close the back door 4, the process proceeds to step 360, and the closing control of the back door 4 is executed.

Steps 360 through 420 are steps 2
The same control as the closing control from 00 to 260 is performed. However, in step 390 corresponding to step 230, if the driver switch S1 is set to the "neutral" mode, the closing control is continuously executed, and otherwise "open".
Alternatively, if the "closed" mode is set, the control for stopping the closing control is performed.

If it is determined in step 270 that the pressure detected by the pressure sensor 10b has not risen,
In step 280, it is determined whether the pressure detected by the pressure detection sensor 10a has increased. If the detected pressure is increased, it is determined that an operation to open the back door 4 has been performed from the outside, and the process proceeds to step 290, where the opening control of the back door 4 is executed.

Steps 290 to 350 are steps 1
The same control as the opening control of 30 to 190 is performed. However, in step 320 corresponding to step 160, if the driver switch S1 is set to the "neutral" mode, the closing control is continuously executed, and otherwise "open".
Alternatively, if the "closed" mode is set, the control for stopping the closing control is performed.

If it is determined in step 280 that the pressure detected by the pressure detection sensor 10a has not risen,
The series of control is stopped, and the back door 4 is held as it is. In the above description of the specific operation according to the flowcharts shown in FIGS. 4 and 5, the initial state of the back door 4 is the fully closed or fully opened state, but the back door 4 is neither fully closed nor fully opened. With respect to the operation from the state where the back door 4 is stopped halfway, the series of operations is the same.

As described above, in the opening / closing device for the back door 4 of the one-box type vehicle 2 of this embodiment, the manual opening / closing operation of the back door 4 is performed by the hydraulic pressure in the hydraulic cylinder 14 constituting the opening / closing mechanism 8. The rise is detected by oil pressure detection sensors 26a and 26b provided on the oil supply tubes 10a and 10b. And EC
U13 determines the direction of operation from the detection results of the hydraulic pressure detection sensors 26a and 26b, and accordingly the switching valve 24
By switching the oil supply / drain direction, the opening / closing mechanism 8 is driven to open or close to open / close the back door 4.

Therefore, when manually opening and closing the back door 4, it is not necessary to operate a special changeover switch as in the conventional device, and the back door 4 can be easily opened and closed by pushing the back door 4 in the opening direction or the closing direction. Can be opened and closed manually. Further, since the pressure change of the working fluid in the hydraulic cylinder 14 due to the manual operation always occurs regardless of the opening degree of the back door 4, the manual operation is always accurately detected regardless of the opening degree of the back door 4. The door 4 can be opened and closed.

Although one embodiment of the present invention has been described above, the structure of the present invention is not limited to that described here, and the same effects as those of the above embodiment can be obtained in the following structure. You can For example, in the above embodiment, the electric motor 22 is used as the drive source of the hydraulic pump 20 of the power unit 12, but it may be used as the drive source via the clutch mechanism using the engine of the vehicle as the power source.

Further, the oil pressure detection sensors are provided on both the opening operation side and the closing operation side to utilize the increase in the detected pressure respectively.
The decrease in the detected pressure may be used, or the increase or decrease in the detected pressure may be used by providing the oil pressure detection sensor on only one side.

[0053]

As described in detail above, in the vehicle door automatic opening / closing apparatus of the present invention, the manual opening / closing operation of the door is detected from the pressure change of the working fluid in the cylinder, and the detected result is determined according to the detection result. The door is automatically driven in the opening direction or the closing direction.

Therefore, unlike the conventional device, there is no need to operate a special changeover switch to open and close the door manually, and the door can be opened and closed easily by simply pushing the door in the opening or closing direction. You can Also, since the pressure change of the working fluid in the cylinder due to the manual operation always occurs regardless of the opening of the door, it is possible to always detect the manual operation accurately regardless of the opening of the door to open and close the door. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is an explanatory diagram showing the entire opening / closing device for the back door 4 in the one-box type automobile 2 of the embodiment.

FIG. 3 is an explanatory diagram illustrating a configuration of a power unit 12 according to an embodiment.

FIG. 4 is a flowchart showing an opening / closing control process of the back door 4 performed in the ECU 13 of the embodiment.

FIG. 5 is a flowchart showing a manual opening / closing control process of the back door 4 performed in the ECU 13 of the embodiment.

[Explanation of symbols]

2 ... One-box type car 4 ... Back door
8 ... Opening / closing mechanism 10 ... Oil supply tube 12 ... Power unit
13 ... ECU 14 ... Hydraulic cylinder 16 ... Piston rod
20 ... Hydraulic pump 22 ... Electric motor 24 ... Switching valve
26 ... Oil pressure detection sensor

Claims (1)

[Claims] 1. A cylinder for expanding and contracting a piston rod by a working fluid supplied from the outside, an opening / closing mechanism for opening and closing a vehicle door by expanding and contracting the piston rod of the cylinder, and supplying and discharging the working fluid to and from the cylinder. In accordance with an opening / closing drive means for driving the opening / closing mechanism and an opening / closing request for the door input from the outside, the supply / discharge direction of the working fluid by the opening / closing drive means is switched to open / close / stop the opening / closing mechanism. An automatic back door opening / closing device for a vehicle, comprising: an opening / closing control means; a fluid pressure detecting means for detecting a fluid pressure of a working fluid in a cylinder supplied and discharged by the opening / closing drive means; When the opening / closing mechanism is stopped, a manual opening / closing operation and operation of the door are performed based on the change in the fluid pressure detected by the fluid pressure detecting means. Direction for detecting a direction, and when the manual opening / closing operation detecting means detects a manual opening / closing operation of the door, the supply / discharge direction of the working fluid by the opening / closing drive means is detected according to the operation direction. A second opening / closing control means for switching the opening / closing mechanism to open or close the opening / closing mechanism, and an automatic opening / closing device for a vehicle door.