JP3759290B2 - Power window drive circuit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power window driving circuit for driving a motor that opens and closes a power window.
[0002]
[Prior art]
FIG. 5 shows a conventional drive circuit that opens and closes a power window. A first opening / closing switch Sd and a main switch Sm provided in a driver's seat and operated by a driver, and a driver provided in a seat other than the driver's seat. And a second opening / closing switch Sa operated by an occupant other than the above. When the main switch Sm is switched to the first position P ₁ , a power source 1 composed of an in-vehicle 12-volt battery and a 0-volt ground 2 are connected to operate the first opening / closing switch Sd or the second opening / closing switch Sa. by enabling opening and closing of the power window, also connect switch the main switch Sm to the second position P ₂ to the power supply 1 and the ground 2 is interrupted, even by operating the first open-close switch Sd for the second opening Even if the switch Sa is operated, the power window cannot be opened or closed.
[0003]
The drive circuit includes the second opening / closing switch Sa, the opening relay Ro and the closing relay Rs, and a power window between the first line L ₁ connected to the power source 1 and the second line L ₂ connected to the ground 2. The motor 3 that is driven to open and close is connected to the main switch Sm. The second opening / closing switch Sa includes a contact 4 biased to a neutral position by a spring (not shown), and this contact 4 can be connected to the open terminal 5o or the closed terminal 5s.
[0004]
When the second opening / closing switch Sa is operated to the open position to connect the contact 4 to the open terminal 5o, the coil 6o of the open relay Ro is excited, and the contact 7o is separated from the OFF terminal 8o and connected to the ON terminal 9o. . As a result, the power source 1 → the first line L ₁ → the ON terminal 9o and the contact 7o of the opening relay Ro → the third line L ₃ → the motor 3 → the third line L ₃ → the contact 7s and the OFF terminal 8s of the closing relay Rs. A circuit of → second line L ₂ → main switch Sm → ground 2 is constructed, and the motor 3 is driven in the opening direction to open the power window. When the second opening / closing switch Sa is operated to the closed position to connect the contact 4 to the closed terminal 5s, the coil 6s of the closing relay Rs is excited, and the contact 7s is separated from the OFF terminal 8s and connected to the ON terminal 9s. The As a result, the power source 1 → the first line L ₁ → the ON terminal 9s and the contact 7s of the closing relay Rs → the third line L ₃ → the motor 3 → the third line L ₃ → the contact 7o and the OFF terminal 8o of the opening relay Ro The second line L ₂ → the main switch Sm → the ground 2 circuit is configured, and the motor 3 is driven in the closing direction to close the power window.
[0005]
On the other hand, the driver Connecting contacts 10 by operating the first opening and closing switch Sd is turned ON terminal 11o, is energized from the electronic circuit E through the fourth line L ₄ to the coil 6o of the opening relay Ro, opening relay Ro is turned on and the motor 3 is driven in the opening direction to open the power window. Further, when the driver connects the contacts 10 by operating the first opening and closing switch Sd is turned OFF terminal 11s, are energized coil 6s of the closing relay Rs via a fourth line L ₄ from the electronic circuit E, the closing relay Rs Is turned on, the motor 3 is driven in the closing direction, and the power window is closed.
[0006]
[Problems to be solved by the invention]
By the way, when the second opening / closing switch Sa of the drive circuit of the power window is wetted due to water immersion or condensation, the insulation resistance between the contact 4 and the open terminal 5o and the insulation resistance between the contact 4 and the closed terminal 5s are reduced. In some cases, both the coils 6o and 6s of the opening relay Ro and the closing relay Rs are both excited and both the contacts 7o and 7s are connected to the ON terminals 9o and 9s. As a result, since the potential of the third line L ₃ on both sides of the motor 3 is 12V both the motor 3 even if operated in the closing direction by operating the second opening and closing switch Sa in the opening direction becomes unrotatable The power window cannot be opened or closed. Moreover, if the insulation resistance between one of the open terminal 5o or the closed terminal 5s and the contact 4 decreases, a malfunction that the power window opens and closes without permission occurs. Such a problem may also occur when the first opening / closing switch Sd and the electronic circuit E get wet due to water immersion or condensation.
[0007]
The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent a power window from malfunctioning and enable a reliable opening / closing operation even when the drive circuit of the power window gets wet due to water immersion or condensation. To do.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is a power window drive circuit for driving a motor for opening and closing a power window, and is opened by operating a first opening / closing switch. A relay, a closing relay that is turned on by the operation of the first opening / closing switch, and the motor connected to the power source via the opened opening relay to drive the motor in the window opening direction by the operation of the first opening / closing switch. A second circuit for connecting the motor to a power source via a closed relay to drive the motor in the window closing direction by operating the first opening / closing switch, and a second opening / closing switch In order to drive the motor in the window opening direction by the operation, the third circuit for connecting the motor to the power source via the closed closing relay and the operation of the second opening / closing switch are used. A fourth circuit for connecting the motor to a power source via an open relay that is turned off to drive the motor in the dough closing direction, a first position for closing the first to fourth circuits, and a second position for opening In a power window drive circuit having a main switch for selecting the motor, the motor is operated as a power source without passing through the opening relay and the closing relay in order to drive the motor in the window opening direction by operating the second opening / closing switch. A fifth circuit to be connected, and a sixth circuit for connecting the motor to the power source without going through the opening relay and the closing relay so as to drive the motor in the window closing direction by operating the second opening / closing switch. The main switch is provided with a third position for opening the first to fourth circuits and closing the fifth circuit and the sixth circuit.
[0009]
According to the above configuration, when the first opening / closing switch is operated with the main switch switched to the first position, the first circuit or the second circuit is configured via the opened opening relay or closing relay. The power window can be opened and closed by driving the motor in the window opening direction or the window closing direction. If the second open / close switch is operated while the main switch is switched to the first position, the third circuit or the fourth circuit is configured via the open or closed relay that has been turned off. The power window can be opened and closed by driving in the direction or the window closing direction. When the main switch is switched to the second position, the first to fourth circuits are opened, so that the power window cannot be opened or closed even if the first opening / closing switch or the second opening / closing switch is operated.
[0010]
When the drive circuit gets wet due to water immersion or condensation, the main switch is switched to the third position, and when the second opening / closing switch is operated in this state, the fifth circuit or the sixth circuit not via the opening relay or the closing relay is Thus, the power window can be reliably opened and closed regardless of malfunction of the opening relay or the closing relay due to leakage current.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0012]
1 to 4 show an embodiment of the present invention, FIG. 1 is a diagram showing a drive circuit for a power window, FIG. 2 is a diagram for explaining the operation when the first opening / closing switch is operated, and FIG. FIG. 4 is a diagram for explaining the action when the switch is operated, and FIG. 1 to 4, the same components as those in the conventional drive circuit of FIG. 5 are denoted by the same reference numerals.
[0013]
As is apparent from a comparison of FIGS. 1 and 5, the drive circuit of this embodiment shown in FIG. 1 is different from the conventional drive circuit shown in FIG. 5 in the structure of the second opening / closing switch Sa and the structure of the main switch Sm. Is different. That is, the second opening / closing switch Sa has two contacts 12o, 12s that operate in conjunction with each other, and one contact 12o is when the second opening / closing switch Sa is operated to the neutral position and the closed position. Is connected to the terminal 13o and connected to the terminal 14o when operated to the open position. The other contact 12s is connected to the terminal 13s when the second opening / closing switch Sa is operated to the neutral position and the open position, and is connected to the terminal 14s when the second opening / closing switch Sa is operated to the closed position. As will be described later, the diodes 15 and 16 are for preventing a circuit from being short-circuited when the first opening / closing switch Sd is operated to open / close the power window.
[0014]
The main switch Sm can be switched between the first position P ₁ , the second position P ₂ and the third position P ₃ , and when the contact 17 is connected to the first position P ₁ , the first opening / closing switch Sd is operated. Even if the second opening / closing switch Sa is operated, the power window can be opened / closed. When the contact 17 is connected to the second position P2, the _second opening / closing switch can be operated even if the first opening / closing switch Sd is operated. Even if the switch Sa is operated, the power window cannot be opened and closed. When the contact 17 is connected to the third position P ₃ , even if the drive circuit gets wet due to water immersion or condensation and current leaks, The power window can be opened and closed by operating the switch Sa.
[0015]
Next, the operation of the embodiment of the present invention having the above-described configuration will be described.
[0016]
First, the operation when the power window is opened / closed by the first opening / closing switch Sd operated by the driver will be described with reference to FIG.
[0017]
As shown in FIG. 2 (A), in a state where the driver has operated the contacts 17 of the main switch Sm in the first position P _1, the operating the first opening and closing switch Sd connects the contact 10 to the open terminal 11o, The electronic circuit E excites the coil 6o of the opening relay Ro, and the contact 7o is separated from the OFF terminal 8o and connected to the ON terminal 9o. As a result, a first circuit C ₁ indicated by a thick solid line is configured, and the motor 3 is driven in the window opening direction to open the power window. At this time, the diode 15 prevents a short circuit between the high voltage side and the low voltage side of the motor 3. Further, as shown in FIG. 2B, when the first opening / closing switch Sd is operated to connect the contact 10 to the closed terminal 11s, the electronic circuit E excites the coil 6s of the closing relay Rs and turns the contact 7s OFF. It is separated from the terminal 8s and connected to the ON terminal 9s. As a result, a second circuit C ₂ indicated by a thick solid line is formed, the motor 3 is driven in the window closing direction, and the power window is closed. At this time, a short circuit between the high voltage side and the low voltage side of the motor 3 is prevented by the diode 16.
[0018]
Next, the operation when the power window is opened / closed by the second opening / closing switch Sa operated by an occupant other than the driver will be described with reference to FIG.
[0019]
As shown in FIG. 3 (A), in a state of operating the contacts 17 of the main switch Sm in the first position P _1, release the contact 12o from terminal 13o occupant other than the driver operates the second opening and closing switch Sa When connected to the terminal 14o Te is configured third circuit C ₃ indicated by a thick solid line, the motor 3 is the power window is opened by being driven by a window opening direction. Also as shown in FIG. 3 (B), when connected to the terminal 14s apart contacts 12s from terminal 13s by operating the second opening and closing switch Sa, it is constituted fourth circuit C ₄ indicated by a thick solid line, the motor 3 Is driven in the window closing direction to close the power window.
[0020]
When the drive circuit gets wet due to water immersion or dew condensation, a leakage current flows through the first opening / closing switch Sd and the electronic circuit E, so that both the opening relay Ro and the closing relay Rs may be turned on. Then, both the third lines L ₃ on both sides of the motor 3 become high potential, and the motor 3 becomes unable to rotate, and the power window cannot be opened or closed. Further, if one of the opening relay Ro and the closing relay Rs is turned on due to the flooding or condensation, there is a possibility that the power window can be opened / closed without operating the first opening / closing switch Sd and the second opening / closing switch Sa. is there.
[0021]
Therefore, when such a situation occurs, the driver switches the main switch Sm to the third position P ₃ as shown in FIG. 4 so that the malfunction of the power window is prevented and the second opening / closing switch Sa is prevented. The power window can be opened and closed by operation.
[0022]
That is, as shown in FIG. 4 (A), while switching the main switch Sm to the third position P _3, when connecting the contacts 12o terminal 14o by operating the second opening and closing switch Sa to the open position, opens A fifth circuit C ₅ (see a thick solid line) that does not pass through the relays Ro and the closing relays Rs is configured, and the motor 3 is driven in the window opening direction to open the power window. Further, as shown in FIG. 4 (B), while switching the main switch Sm to the third position P _3, when the second opening and closing switch Sa is operated in the closed position to connect the contacts 12s to the terminals 14s, open A sixth circuit C ₆ (see a thick solid line) that does not pass through the relays Ro and the closing relays Rs is configured, and the motor 3 is driven in the window closing direction to close the power window.
[0023]
Since the fifth circuit C ₅ and the sixth circuit C ₆ do not pass through the opening relay Ro or the closing relay Rs, even if the opening relay Ro or the closing relay Rs malfunctions due to water immersion or dew condensation, The power window can be reliably opened and closed without being affected.
[0024]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0025]
For example, in the embodiment, the main switch Sm is switched to the third position P ₃ by the operation of the driver. However, a sensor for detecting water immersion or condensation in the drive circuit is provided, and this sensor detects the water immersion or condensation. Sometimes, the main switch Sm may be automatically switched to the third position P ₃ .
[0026]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the drive circuit gets wet due to water immersion or dew condensation, the main switch is switched to the third position, and the second opening / closing switch is operated in this state. Since the fifth circuit or the sixth circuit without the relay or the closing relay is configured, the power window can be reliably opened and closed regardless of the malfunction of the opening relay or the closing relay due to the leakage current.
[Brief description of the drawings]
FIG. 1 is a diagram showing a drive circuit of a power window. FIG. 2 is an explanatory diagram of an action when operating a first opening / closing switch. FIG. 3 is an explanatory diagram of an action when operating a second opening / closing switch. FIG. 5 is a diagram showing a conventional power window driving circuit.
DESCRIPTION OF SYMBOLS 1 Power supply 3 Motor C ₁ 1st circuit C ₂ 2nd circuit C ₃ 3rd circuit C ₄ 4th circuit C ₅ 5th circuit C ₆ 6th circuit P ₁ 1st position P ₂ 2nd position P ₃ 3rd position Ro Opening relay Rs Closing relay Sd First opening / closing switch Sa Second opening / closing switch Sm Main switch

Claims (1)

A power window drive circuit for driving a motor (3) for opening and closing a power window,
An opening relay (Ro) which is turned on by operating the first opening / closing switch (Sd);
A closing relay (Rs) that is turned on by operating the first opening / closing switch (Sd);
In order to drive the motor (3) in the window opening direction by the operation of the first opening / closing switch (Sd), the motor (3) is connected to the power source (1) via the opened opening relay (Ro). Circuit (C ₁ );
In order to drive the motor (3) in the window closing direction by the operation of the first opening / closing switch (Sd), the motor (3) is connected to the power source (1) via the turned-on closing relay (Rs). A circuit (C ₂ );
In order to drive the motor (3) in the window opening direction by operating the second opening / closing switch (Sa), the motor (3) is connected to the power source (1) via the closed closing relay (Rs). Circuit (C ₃ );
In order to drive the motor (3) in the window closing direction by the operation of the second opening / closing switch (Sa), the motor (3) is connected to the power source (1) via the opened opening relay (Ro). Circuit (C ₄ );
A main switch (Sm) for selecting a first position (P ₁ ) for closing the first to fourth circuits (C _{1 to} C ₄ ) and a second position (P ₂ ) for opening;
In a power window drive circuit comprising:
In order to drive the motor (3) in the window opening direction by the operation of the second opening / closing switch (Sa), the motor (3) is supplied with the power (1) without passing through the opening relay (Ro) and the closing relay (Rs). And a fifth circuit (C ₅ ) connected to
In order to drive the motor (3) in the window closing direction by operating the second opening / closing switch (Sa), the motor (3) is powered by the power supply (1) without the opening relay (Ro) and the closing relay (Rs). A sixth circuit (C ₆ ) connected to
With
A third position (opening the _{first to} fourth circuits (C _{1 to} C ₄ ) and closing the fifth circuit (C ₅ ) and the sixth circuit (C ₆ ) to the main switch (Sm) ( A drive circuit for a power window, characterized in that P ₃ ) is provided.

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