JPH076034Y2 - Vehicle moving equipment control circuit - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit used in a vehicle moving equipment device such as a seat belt device and a power window device.

[0002]

2. Description of the Related Art A seat belt device is known as a vehicle moving equipment device of this type.

In the seat belt device, as shown in FIG. 9, an anchor plate 20 is connected to a tip end portion of the webbing 14 pulled out from the winding device 18 via a connecting plate 19. The anchor plate 20 can be moved in the vehicle front-rear direction by being guided by a guide rail 22 mounted on the vehicle body,
This movement is controlled by the control circuit.

According to the control circuit, when the door switch detects the opening of the door, the motor 44 rotates in the forward direction to move the anchor plate 2
0 moves to the front of the vehicle, and the wearing of the webbing on the occupant 12 is released. When the door switch detects that the door is closed, the motor 44 reversely rotates, the anchor plate 20 moves rearward of the vehicle, and the occupant 12 is fitted with the webbing.

[0005]

When the occupant 12 moves his / her upper body while the anchor plate 20 is moving, the upper part of the webbing 14 interferes with the neck and the head of the occupant 12, causing the occupant 12 to feel uncomfortable. May be given. In addition, the motor 44
May be locked and burned.

In view of the above circumstances, the present invention has a simple structure and prevents the moving equipment from being adversely affected when the moving equipment interferes with an obstacle such as an occupant during the movement of the moving equipment. In order to prevent the motor from burning out, the motor can be stopped in response to the interference, and the motor can be automatically driven and returned, and further, the motor can be stopped and driven well. It is an object of the present invention to obtain a vehicle moving equipment device control circuit capable of performing the above-mentioned operation and properly stopping the motor.

[0007]

In a vehicle moving equipment device control circuit according to the present invention, there is provided a motor current detecting resistor used in a vehicle moving equipment device and connected in series to a motor for moving a moving equipment item. , A comparator that inputs the voltage across the terminals of this motor current detection resistor and outputs a motor overcurrent signal by comparing it with a reference voltage, and a temperature detection circuit that outputs a temperature detection signal when the ambient temperature is above a certain temperature. And a temporary stop means for turning off the motor for a certain period of time when a motor overcurrent signal is input and a temperature detection signal is input after a certain period of time has passed since the motor was started.

[0008]

According to the above construction, when the moving equipment interferes with an interfering object such as an occupant during this movement and the motor is mechanically restrained, the voltage across the terminals of the motor current detecting resistor has a constant value. As described above, the motor overcurrent signal is output from the comparator.

On the other hand, when the ambient temperature is above a certain temperature, the temperature detection circuit outputs a temperature detection signal.

When a motor overcurrent signal and a temperature detection signal are input after a lapse of a certain time after starting the motor, the motor temporary stop means cuts the power supply to the motor for a certain time.

Therefore, even if the motor overcurrent signal is input, the motor temporary stop means does not operate unless the temperature detection signal is input.

As a result, the moving resistance of the moving equipment increases at a low temperature, so that the moving equipment interferes with the interfering object and is restrained even though the moving equipment does not interfere with the interfering object. It is possible to prevent the wrong judgment that the motor is stopped, and to stop the motor properly.

By cutting off the power supply to the motor by the motor temporary stopping means, even if the moving equipment interferes with an interfering object such as an occupant during the movement, the occupant may feel discomfort and the interfering object is adversely affected. And the motor is prevented from being burnt out.

Further, since the temporary stop means is operated for a fixed time by the input of the overcurrent signal regardless of the overcurrent itself to turn off the motor, the motor is turned off and the motor is returned to the on state instantaneously, and the motor is turned on. Deterioration of the motor due to the time-consuming turn-off is satisfactorily prevented, and the motor is automatically turned back on. Furthermore, the temporary stop means does not operate until a certain time has elapsed after the motor was started. Does not turn off, the malfunction of the starting current generated at the time of starting the motor is prevented, and the motor is stopped and the drive is restored well.

In particular, since interference between moving equipment and an interfering object is often expected, it is extremely effective to prevent the adverse effect on the occupant due to the interference and prevent the motor from burning.

The above-described operational effects can be achieved with a simple structure.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a vehicle moving equipment control circuit according to the present invention will be described with reference to FIGS.

FIG. 2 shows a seat belt device which constitutes a vehicle moving equipment device. In this seat belt device, the webbing 14 is automatically attached to the occupant 12 seated on the seat 10. One end of the webbing 14 is wound by a predetermined urging force on a winding device 18 mounted on a floor 16 in a substantially central portion of the vehicle. The winding device 18 has a built-in inertia lock mechanism capable of instantaneously stopping the withdrawal of the webbing 14 in the event of a vehicle emergency.

The other end of the webbing 14 is locked to the anchor plate 20 via a connecting plate 19. The anchor plate 20 is guided along the guide rail 22 in the vehicle front-rear direction. The guide rail 22 is a guide rail main body 24.
The central portion of the vehicle is horizontally arranged on the roof side member 26 forming a part of the side wall of the vehicle body, and the front end is attached along the front pillar 28 and is inclined. The vehicle rear end of the guide rail main body 24 is bent substantially at a right angle, faces the vehicle downward direction, and is fixed to the center pillar 30.

As shown in FIG. 3, the guide rail main body 24
Has a substantially U-shape having a groove 32 that opens downward in the vehicle. The bottom of the groove 32 is expanded in diameter to accommodate the head 34 formed at the tip of the anchor plate 20. The head portion 34 serves to reliably transmit the tension generated in the webbing 14 to the roof side member 26 in the event of a vehicle emergency.

A tape accommodating groove 36 having a partially enlarged width is formed in the middle of the groove 32 in the height direction. The tape accommodating groove 36 has a flexible tape 38 extending in the longitudinal direction of the guide rail 22. Guide to slide.

The flexible tape 38, as shown in FIG.
The flexible tape 38 is a thick and long material, and has a plurality of openings 40 formed in the longitudinal direction. Opening 40
The anchor plate 20 penetrates one of them, and the anchor plate 20 can move together with the flexible tape 38. A part of the flexible tape 38 meshes with a sprocket wheel 42 attached to the lower portion of the center pillar 30,
The sprocket wheel 42 receives the driving force of the motor 44 and rotates to move the flexible tape 38 in the longitudinal direction. The sprocket wheel 42 is used for the center pillar 30.
It is housed in a housing 46 that is attached to the bottom of the tape to ensure secure engagement with the flexible tape 38. A tape guide rail 47 is provided between the sprocket housing 46 and the guide rail body 24. Also,
A tape guide rail 47 is wound around the sprocket housing 46 on the side opposite to the guide rail body 24.

In the guide rail main body 24, strips 48 are in contact with each other near the entrance of the groove 32, as shown in FIG. These strips 48 are configured such that a projection 50 provided in a part thereof is housed in a groove 52 formed in a side portion of the guide rail main body 24. The leading ends of the strips 48 project from the lower end of the guide rail main body 24 and abut each other to close the entrance of the groove 32, but when the anchor plate 20 passes, they are separated to secure the passage of the anchor plate 20.

Guide rail body 24 and strip 48
The upper part of is covered by a cover 54. A mounting plate 56 is fixed to the side surface of the cover 54, and the mounting plate 56 is screwed to the roof side member 26 with a bolt 58.

As shown in FIG. 2, the guide rail main body 24
A release detection switch 62 is provided at the front end of the vehicle, and the release detection switch 62 detects the front end of movement of the anchor plate 20. A mounting detection switch 60 is arranged at the other end of the guide rail body 24, and the mounting detection switch 60 detects the end of the movement of the anchor plate 20. A seating detection switch (seat switch) 64 is arranged on the seat cushion of the seat 10, and the seating detection switch 64 detects the seating of the occupant 12 on the seat 10. Although not shown in FIG. 2, a door switch (see FIG. 1) for detecting opening / closing of the door is provided on the vehicle body.

Next, a seatbelt device control circuit for controlling the release of the seatbelt device will be described with reference to FIG.

The common terminal of the door switch 66 is grounded, and the closing side terminal 66A is connected to the input terminal P ₁ of the microcomputer 68 via the mounting position detecting switch 60 and the sheet switch 64. When the occupant sits on the seat, the door is closed, and the seat switch 64 is closed, the input terminal P ₁ becomes low level (hereinafter referred to as “L”). When the anchor plate 20 moves to the rear of the vehicle and the webbing attachment is completed, the attachment position detection switch 60 is opened, and the input terminal P ₁ becomes high level (hereinafter referred to as “H”).

The open side terminal 66B of the door switch 66
Is connected to the input terminal P ₂ of the microcomputer 68 via the release position detection switch 62. When the door is opened, the input terminal P ₂ becomes L. Anchor plate 20
Is moved to the front side of the vehicle and the webbing attachment is released, the release position detection switch 62 is opened and the input terminal P is released.
₂ becomes H.

Output terminal P _{3 of the} microcomputer 68
A motor forward rotation signal is output from the drive circuit to excite the relay coil 74 of the relay 72 via the drive circuit 70, whereby the C contact 78 can be operated. A motor reverse signal is output from the output terminal P ₄ of the microcomputer 68, and the relay coil 7 of the relay 72 is passed through the drive circuit 70.
By energizing 6, the C contact 80 becomes operable. The motor 44 is connected to the common terminals of the C contact 78 and the C contact 80. Normally open terminal 78A of C contact 78 and normally open terminal 80 of C contact 80
A is connected to the + B volt terminal of a power supply circuit (not shown). The normally closed terminal 78B of the C contact 78 and the normally closed terminal 80B of the C contact 80 are connected to the resistor 8
It is grounded through 2. Exciting the relay coil 74, the common terminal of the C contact 78 and the normally open terminal 78
The motor 44 rotates in the normal direction when A is brought into conduction, and the motor 44 rotates in reverse when the relay coil 76 is excited to bring the common terminal of the C contact 80 and the normally open terminal 80A into conduction.

The current flowing through the motor 44, that is, the current flowing through the resistor 82 is proportional to the voltage across the resistor 82. The voltage between the terminals of the resistor 82 is supplied to the comparator 90,
The supplied voltage is compared with the reference voltage determined by the resistance values R ₂ and R ₃ and supplied to the input terminal P ₈ of the microcomputer 68. When the rate of change of the current flowing through the motor 44 exceeds a certain value, the input terminal P ₈ becomes H.

On the other hand, the temperature detecting circuit 92 is connected to the input terminal P ₉ of the microcomputer 68. The temperature detection circuit 92 is composed of a comparator, and detects a resistance change of the thermistor Rx whose resistance value decreases as the ambient temperature rises as a voltage change, and compares it with a reference voltage when the temperature is a certain value or more. Outputs H to the input terminal P ₉ of the microcomputer 68.

A speaker 97, an indicator lamp 98, and an indicator lamp 99 are connected to the microcomputer 68 via a drive circuit 96. Depending on the necessary condition settings such as when the movement of the anchor plate 20 is restrained, the speaker 97 continuously or interrupts the electronic sound to emit the sound, and the indicator lights 98 and 99 blink or light to warn the occupant. Emit.

Next, the operation of the above embodiment will be outlined. Figure 5
As shown in FIG. 6, when the passenger gets off the vehicle, when the door is opened, the open side terminal 66B of the door switch 66 is grounded, and the input terminal P ₂ of the microcomputer 68 becomes L (a in FIG. 6). The microcomputer 68 reads the fall of the potential of the input terminal P ₂ and outputs the output terminal P ₃ at H level.
Then, the relay coil 74 is excited to rotate the motor 44 in the normal direction (B in FIG. 6). As a result, a large starting current flows through the motor 44 (C in FIG. 5), and a pulse is input to the input terminal P ₈ (D in FIG. 6).

If the ambient temperature is above a certain value, H is output to the input terminal P ₉ of the microcomputer 68 (shown by the solid line in FIG. 6).

Until the motor 44 is turned on and the predetermined time t ₁ elapses, the input terminal P ₈ becomes H, and even if the input terminal P ₉ becomes H, this is ignored.

After the lapse of the time t ₁ , the upper body moves when the occupant tries to get off the vehicle, and the webbing 14 interferes with the neck or head of the occupant 12 to restrain the movement of the anchor plate 20. It becomes smaller, the current flowing through the resistor 82 increases (e in FIG. 5), and the input terminal P ₈
Becomes H (F in FIG. 6). Microcomputer 68
The input terminal P ₈ is H and the input terminal P ₉ is H, the output terminal P _{3 is set} to L and the motor 4
4 is turned off for a fixed time t ₂ (FIG. 6G). The output terminal P _{3 is set} to H again to turn on the motor 44, and the above processing is repeated.

Therefore, even if the upper body of the occupant moves and the webbing interferes with the neck or the head of the occupant during the movement of the tip portion of the ebbing, the rotation of the motor 44 is instantaneously stopped and the movement of the webbing is stopped. As a result, the occupant will not feel uncomfortable and the motor will not be burnt out.

If the ambient temperature does not exceed a certain value, L is output to the input terminal P ₉ of the microcomputer 68 (shown by the chain line in FIG. 6). If L is output, Even if the input terminal P ₈ becomes H, the motor 44
Does not turn off.

Therefore, even if the current flowing through the resistor 82 increases due to the increase in the slip resistance of the anchor plate 20 at a low temperature, it is erroneously determined that the anchor plate 20 is mechanically restrained. Absent.

When the anchor plate 20 moves to the position of the release position detecting switch 62, the release position detecting switch 6
2 is opened and the input terminal P ₂ becomes H (H in FIG. 6). The microcomputer 68 reads that the input terminal P ₂ has become H, sets the output terminal P ₃ to L, and turns off the motor 44 (FIG. 6). The same applies when the occupant gets on the vehicle.

Next, the operation of the above embodiment will be described with reference to FIGS.
Based on the above, detailed description will be given according to the control flowchart.

First, the RA of the microcomputer 68
The work area of M and the output (“L” is output to the output terminals P _{3 to} P ₇ ) are initialized (step 10).
0).

It waits until the input terminal P ₁ or the input terminal P ₂ becomes L (steps 101 and 104).

When it is read that the input terminal P ₂ has become L, the output terminal P _{3 is set} to H, the motor 44 is normally rotated, and the output terminal P _{6 is set} to H to turn on the indicator lamp 98 (step 102). This output is self-held until L is output. The same applies to other outputs.

When it is read that the input terminal P ₁ has become L, the output terminals P ₄ and P ₇ are set to H, the motor 44 is rotated in the reverse direction, and the indicator lamp 99 is turned on (step 10).
6).

When the processing of step 102 or step 106 is completed, the value of t ₀ is set to t ₁ (step 108),
The soft timer subroutine shown in FIG. 8 is processed (step 110).

That is, as shown in FIG. 8, the value of t ₀ is decremented (step 200), and this is repeated until the value of t ₀ becomes 0 (step 20).
2).

In this way, it can be ignored that the input terminal P ₈ becomes H and the input terminal P ₉ becomes H due to the start-up current flowing through the motor 44.

Next, it is read whether the input terminal P ₈ is H, that is, whether the movement of the anchor plate 20 is restricted. Also, the input terminal P ₉ is H
Is read, that is, whether the ambient temperature is above a certain temperature. When the input terminal P ₈ is H and the input terminal P ₉ is H (step 112), the speaker 97 emits a warning sound,
When the input terminal P ₁ is L, the indicator lamp 98 blinks, and when the input terminal P ₂ is L, the indicator lamp 99 blinks (step 114).

Next, the output terminals P ₃ and P ₄ are set to L
Then, the motor 44 is turned off. Note that either the output terminal P ₃ or the output terminal P ₄ is already L.

Next, the value of t ₀ is set to t ₂ (step 11
8) Then, the subroutine is processed, and the process waits until a predetermined time t _{2 has} elapsed (step 120).

Next, the speaker 97 turns off the sound emission, and when the input terminal P ₁ is at L, the indicator lamp 98 is turned on (step 122).

Next, when the motor 44 is operated again,
H of P ₈ and H of the input terminal P ₉ shown in FIG.
_{During step 1} , to prevent reading, step 101
Return to.

When the input terminal P ₈ is L in step 112, when the input terminal P ₁ is L, the output terminal P _{3 is set} to H and the motor 44 is normally rotated (steps 124 and 126).
When the input terminal P ₂ is L, the output terminal P _{4 is set} to H and the motor 44 is rotated in the reverse direction (steps 128 and 130).

Then, the process returns to step 112. The outputs of the output terminals P _{3 to} P ₇ are self-held and the output terminal P ₃
To P ₇ is there is no output change with the further output terminal P ₃ to P ₇ when the H in H. The same applies to the case of L. If both the input terminal P ₁ and the input terminal P ₂ are H, the process returns to the first step 100 and the motor 44,
The indicator lights 98 and 99 are turned off, and the above processing is repeated.

When the input terminal P ₉ is L, the motor 44 is not turned off even when the input terminal P ₈ is H. That is, the processing of steps 114 to 120 in FIG. 7 is not performed.

Although the control circuit of the seat belt device has been described in the above embodiment, the vehicle moving equipment device is not limited to the seat belt device, and the motor may be locked when the motor is mechanically locked. The control circuit for stopping the vehicle for a certain period of time can be applied to other vehicle moving equipment devices, such as a vehicle power window device.

[0058]

In the vehicle moving equipment control circuit according to the present invention, when the motor overcurrent signal and the temperature detection signal are input after the motor has been started for a certain time, the motor is temporarily stopped. The means cuts off the power supply to the motor for a certain period of time.

Therefore, even if the motor overcurrent signal is input, the motor temporary stop means does not operate unless the temperature detection signal is input.

As a result, due to the increased movement resistance of the moving equipment at low temperature, the moving equipment interferes with the interfering object and is restrained even though the moving equipment does not interfere with the interfering object. It is possible to prevent the wrong judgment that the motor is stopped, and to stop the motor properly.

By cutting off the energization of the motor by the motor temporary stopping means, even if the moving equipment interferes with an interfering object such as an occupant during the movement, the occupant may feel discomfort or the like. And the motor is prevented from being burnt out.

In addition, the temporary stop means operates for a fixed time by the input of the overcurrent signal regardless of the overcurrent itself, and the motor is turned off. Therefore, the motor is turned off and the motor is returned to the on state instantaneously, and the motor is turned on. Deterioration of the motor due to the time-consuming turn-off is satisfactorily prevented, and the motor is automatically turned back on. Furthermore, the temporary stop means does not operate until a certain time has elapsed after the motor was started. Does not turn off, the malfunction of the starting current generated at the time of starting the motor is prevented, and the motor is stopped and the drive is restored well.

In particular, since interference between moving equipment and an interfering object is expected to occur in many cases, it is extremely effective to prevent the occupant from being adversely affected by the interference and to prevent the motor from burning.

The above-described operational effects can be achieved with a simple structure.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a seat belt device control circuit according to an embodiment of the present invention.

FIG. 2 is a side view showing a state in which an occupant wears a seat belt device.

FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG. 2 in a state where the anchor plate is moved to the position of line 3-3.

FIG. 4 is an exploded perspective view showing a relationship between a sprocket and a flexible tape that drives an anchor plate housed in a guide rail.

FIG. 5 is a diagram showing the current flowing in a motor as a function of time.

6 is an output waveform diagram of the microcomputer corresponding to FIG.

FIG. 7 is a control flowchart.

FIG. 8 is a control flowchart.

FIG. 9 is a side view corresponding to FIG. 2 showing a problem of the conventional example.

[Explanation of symbols]

 14 Webbing (moving equipment) 44 Motor 68 Microcomputer (motor temporary stop means) 82 Resistor (motor current detection detector) 90 Comparator 92 Temperature detection circuit Rx Thermistor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hibino Issei 1 Noda, Oguchi-cho, Oguchi-machi, Niwa-gun, Aichi Prefecture Toda Rika Electric Works Co., Ltd. No. 1 Tokai Rika Denki Seisakusho Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A motor current detecting resistor, which is used in a vehicle moving equipment device and is connected in series to a motor for moving a moving equipment, and a terminal voltage of the motor current detecting resistor is input to a reference voltage. Comparator that outputs a motor overcurrent signal, a temperature detection circuit that outputs a temperature detection signal when the ambient temperature is higher than a certain temperature, and a motor overcurrent signal And a temporary stop means for turning off the motor for a certain period of time when a temperature detection signal is input, and a moving equipment device control circuit for a vehicle.