JP5633968B2 - Seat belt retracting system - Google Patents

Description

  The present invention relates to a seat belt winding system for winding a seat belt provided on a driver seat side and a passenger seat side of a vehicle.

  A conventional seat belt winding system includes a spool for winding a seat belt, a seat belt retractor having a motor for rotating the spool, a driver for driving the motor, and an ECU for controlling the driver. Is known (see, for example, Patent Document 1).

JP 2004-123042 A

  In the above prior art, the motor and the driver are provided in the seat belt retractor on the driver's seat side and the passenger seat side, and each driver is controlled by one ECU. At this time, if the ECU is mounted at a position away from the driver, a harness for connecting the ECU and the driver becomes long, so noise is likely to be generated between the ECU and the driver, and noise countermeasures are required. Cost increases.

  An object of the present invention is to provide a seat belt retracting system that can reduce noise generated when a motor is driven without particularly taking measures against noise that causes an increase in cost.

In order to achieve the above object, a seat belt winding system of the present invention includes a first spool that winds up a first seat belt provided on the driver's seat side, and a first motor that rotates the first spool. A first seat belt retractor; first motor driving means for driving the first motor; a second spool for winding up a second seat belt provided on a seat side other than the driver's seat; and a second spool for rotating the second spool. A second seat belt retractor having two motors, a second motor driving means for driving the second motor, and a common control means for controlling the first motor driving means and the second motor driving means in common. When, and a switching means for ON / OFF driving of the first motor by the second motor drive means, said common control means, said first seat belt retry click And it is characterized in that provided in the.

In the seat belt retracting system of the present invention, one common control means for controlling the first motor driving means of the first seat belt retractor and the second motor driving means of the second seat belt retractor in common is provided in the driver's seat. By providing the first seat belt retractor on the side, the length of the harness connecting the common control means and the first motor driving means can be minimized. Thereby, when driving the 1st motor by the side of a driver's seat, the noise which arises between a common control means and the 1st motor drive means can be reduced. In the present invention, switching means for turning ON / OFF the driving of the first motor by the second motor driving means is provided. In general, seats other than the driver's seat (for example, the passenger seat) may be vacant, but since the driver gets on the driver's seat, the frequency of use of the seat belt on the driver's seat side Overwhelmingly higher than the frequency of use. That is, in this case, even if the first motor drive means on the driver's seat side should break down, the first motor is switched from OFF to ON by switching the first motor by the second motor drive means. Since it is driven by the driving means, it is possible to preferentially continue using the first motor of the first seat belt retractor that is frequently used.

  Preferably, the first motor driving means is a motor drive circuit board having a driver for driving the first motor, and the second motor driving means is a motor having a driver for driving the second motor. It is a drive circuit board.

Preferably, the first motor driving means and the second motor driving means are:
Along with the common control means, the first seat belt retractor is provided. Thereby, since both the common control means and the first motor driving means are arranged in the first seat belt retractor, the length of the harness connecting them can be minimized.

  According to the present invention, noise generated between the common control means and the first motor driving means when the first motor on the driver's seat side is driven can be reduced without taking any noise countermeasures that increase costs. be able to.

It is a schematic structure figure showing one embodiment of a seatbelt winding system of the present invention. It is a figure which shows typically the seatbelt apparatus by the side of a driver's seat. It is a figure which shows typically the structure of a seatbelt retractor. It is a circuit block diagram of the motor drive system of a seatbelt winding system. It is a timing diagram of a clock for motor drive. It is another circuit block diagram of the motor drive system of a seatbelt winding system. FIG. 10 is still another circuit configuration diagram of a motor drive system of the seat belt retracting system.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing an embodiment of a seat belt winding system of the present invention. In FIG. 1, the seat belt retracting system 1 of the present embodiment includes a seat belt retractor 11 on the driver's seat side, a seat belt retractor 21 on the passenger seat side, and one seat belt retractor 11 provided on the driver seat side. An electronic control unit (ECU; corresponding to common control means) 2 is provided.

  The seat belt retractor 11 includes at least a spool 13 that winds up the seat belt 12 on the driver's seat side, and a motor 14 that rotates the spool 13. The driving force of the motor 14 that rotates the spool 13 is transmitted to the spool 13 via the power transmission mechanism. A motor drive circuit board 16 (corresponding to first motor driving means) having a driver 31 (see FIG. 4) for driving the motor 14 is provided in the electronic control unit 2. The seat belt retractor 21 includes a spool 23 that winds up the seat belt 22 on the passenger seat side, and a motor 24 that rotates the spool 23. A motor drive circuit board 26 (corresponding to the second motor driving means) having a driver 41 (see FIG. 4) for driving the motor 24 is also provided in the electronic control unit 2 as described above. The motor drive circuit boards 16 and 26 may be provided outside the electronic control unit 2.

  FIG. 2 is a diagram schematically showing a seat belt device on the driver's seat side. In FIG. 2, the seat belt device 100 includes a seat belt 12 in which a belt anchor 12a at a front end is fixed to a floor of a vehicle body or a seat 6, the seat belt retractor 11 that winds up the seat belt 12, and the seat. A guide anchor 7 that guides the seat belt 12 pulled out from the belt retractor 11 toward the occupant's shoulder, a tongue 8 that is slidably supported by the seat belt 12 guided from the guide anchor 7, and a vehicle body The buckle 9 is fixed to the floor or the seat 6 and into which the tongue 8 is detachably inserted. The configuration of the seat belt device on the passenger seat side is the same as that of the seat belt device 100 on the driver seat side.

  As shown in FIG. 3A, the spool 13 of the seat belt retractor 11 is rotatably supported by a frame 17 having a U-shaped cross section having a back plate for attaching the seat belt retractor 11 to the vehicle body. The ECU 2 and the motor 14 are arranged below the frame 17. The motor 14 and the motor drive circuit board 16 provided in the ECU 2 are connected by a harness 19. The ECU 2 and the motor 14 may be disposed on the upper portion of the frame 17 or on the back plate.

  As shown in FIG. 3B, the spool 23 of the seat belt retractor 21 is rotatably supported by a frame 27 having a U-shaped cross section. The motor 24 is disposed below the frame 27. The motor 24 and the motor drive circuit board 26 provided in the ECU 2 are connected by a harness 29. The motor drive circuit board 16 and the motor drive circuit board 26 are connected in the ECU 2 by a harness (not shown).

  FIG. 4 is a circuit configuration diagram of a motor drive system of the seat belt retracting system 1. 4, the seat belt retracting system 1 includes the motor drive circuit board 16 provided in the seat belt retractor 11 on the driver's seat side and the motor drive circuit board 26 provided on the seat belt retractor 21 on the passenger seat side. And a CPU 2A provided in the ECU 2 for controlling the electric circuits of the motor drive circuit boards 16 and 26.

  The motor drive circuit board 16 has a driver 31 that drives the motor 14. The driver 31 includes a motor power supply 32 and FETs 33a to 33d. The gates of the FETs 33a to 33d are connected to the CPU 2A. The drains of the FETs 33a and 33c are connected to the motor power source 32, and the sources of the FETs 33a and 33c are connected to the drains of the FETs 33b and 33d. The source of the FET 33a is also connected to the + terminal of the motor 14, and the source of the FET 33c is also connected to the-terminal of the motor 14. The sources of the FETs 33b and 33d are grounded. The + terminal and − terminal of the motor 14 may be reversed.

  The motor drive circuit board 26 includes a driver 41 that drives the motor 24 and three-terminal switches 44 a and 44 b that switch ON / OFF of the driving operation of the motor 14 by the driver 41.

  The driver 41 includes a motor power supply 42 and FETs 43a to 43d. The gates of the FETs 43a to 43d are connected to the CPU 2A. The drains of the FETs 43a and 43c are connected to the motor power supply 42, and the sources of the FETs 43a and 43c are connected to the drains of the FETs 43b and 43d. The source of the FET 43a is connected to the + terminal of the motor 24 via the switch 44a, and the source of the FET 43c is connected to the-terminal of the motor 24 via the switch 44b. The sources of the FETs 43b and 43d are grounded. Further, the switches 44 a and 44 b are connected to the + terminal and the − terminal of the motor 14 via the communication harness 45.

  The switch 44a is switched between a normal position (shown) where the FETs 43a, 43b and the motor 24 are connected, and a failure position where the FETs 43a, 43b and the motor 14 are connected. The switch 44b is switched between a normal position (illustrated) for connecting the FETs 43c and 43d and the motor 24 and a failure position for connecting the FETs 43c and 43d and the motor 14.

  The CPU 2A controls the drivers 31 and 41 in common. Specifically, the CPU 2A controls the FETs 33a to 33d to operate the motor 14 based on a buckle signal from a buckle sensor (not shown) on the driver's seat side and an emergency signal from a collision prediction sensor (not shown). At the same time, the FETs 43a to 43d are controlled to operate the motor 24 based on the buckle signal from the buckle sensor on the passenger seat side and the emergency signal from the collision prediction sensor.

  Further, the CPU 2A controls the switches 44a and 44b to switch from the normal position to the failure position when a failure of the driver 31 is detected. Thereby, when the driver 31 on the driver seat side breaks down, the driver seat side driver 41 drives the driver seat side motor 14. The failure of the driver 31 can be detected from the current value or voltage value flowing through the FETs 33a to 33d.

  Here, when controlling the drivers 31 and 41 by the CPU 2A, as shown in FIG. 5 (a), if the motor drive clock on the driver side and the motor drive clock on the passenger side have the same polarity, Since currents simultaneously flow through the drivers 31 and 41 instantaneously at the rising timing and falling timing of each clock, the required current of the CPU 2A increases.

  Therefore, as shown in FIG. 5B, the polarity is inverted between the motor drive clock on the driver side and the motor drive clock on the passenger side by shifting the state of FIG. 5A by one clock. Clock control is performed so that As a result, no current flows through the drivers 31 and 41 at the same time, so that the required current of the entire ECU 2 can be reduced. Further, as shown in FIG. 5 (c), the rising timing of the motor drive clock on the driver's seat side is shifted from the rising timing of the motor drive clock on the passenger seat side, and the rising timing of the motor drive clock on the driver seat side is shifted. The descending timing may be shifted from the falling timing of the motor drive clock on the passenger seat side. Thereby, the maximum current can be reduced.

  As described above, in the present embodiment, the ECU 2 that controls the drivers 31 and 41 in common is provided in the seat belt retractor 11 on the driver's seat side where the use frequency of the seat belt 12 (operating rate of the motor 14) is high. The length of the harness that connects the ECU 2 and the driver 31 is shortened, and in some cases, the harness that connects the two becomes unnecessary. Thereby, the noise which arises between ECU2 and the driver 31 can be reduced, without taking the noise countermeasure which causes cost increase in particular. As a result, the drive control of the motor 14 on the driver's seat side can be performed accurately.

  When the driver's side driver 31 breaks down, the driver's side motor 41 is controlled by the passenger's side driver 41, so that the use of the motor 14 can be continued.

  In the above description, the passenger seat is taken as an example of a seat other than the driver seat, and the driver 41 that drives the motor 24 of the seat belt retractor 21 on the passenger seat side and the motor 14 of the seat belt retractor 11 on the driver seat side are provided. The driver 31 to be driven is controlled by a common ECU, but is not limited thereto. That is, instead of the passenger seat, a driver that drives the motor of the seat belt retractor on the side of the rear seat (particularly the rear seat of the driver's seat), and a driver 31 that drives the motor 14 of the seat belt retractor 11 on the driver seat side, You may control by common ECU. In this case, the same effect is obtained.

  FIG. 6 is another circuit configuration diagram of the motor drive system of the seat belt retracting system 1. In the figure, the same elements as those shown in FIG.

  In FIG. 6, the source of the FET 43 a and the drain of the FET 43 b in the driver 41 are directly connected to the + terminal of the motor 24, and the source of the FET 43 c and the drain of the FET 43 d are directly connected to the − terminal of the motor 24.

  The driver 41 has two-terminal type switches 50a and 50b instead of the switches 44a and 44b. The + terminal of the motor 24 and the + terminal of the motor 14 are connected via the switch 50 a and the communication harness 45, and the − terminal of the motor 24 and the − terminal of the motor 14 are connected via the switch 50 b and the connection harness 45. Connected. The switches 50a and 50b are normally in an OFF state (shown). The switches 50a and 50b may be provided in the driver 31.

  The CPU 2A controls the switches 50a and 50b to be switched from OFF to ON when a failure of the driver 31 is detected. Thereby, when the driver 31 on the driver's seat side breaks down, the driver's seat side driver 41 controls the driver's seat side motor 14.

  FIG. 7 is still another circuit configuration diagram of the motor drive system of the seat belt retracting system 1. In the figure, the same elements as those shown in FIG.

  In FIG. 7, the driver 31 has three-terminal type switches 51a and 51b for switching ON / OFF of the driving operation of the motor 14 by the driver 41 in cooperation with the switches 44a and 44b. The source of the FET 33a and the drain of the FET 33b in the driver 31 are connected to the positive terminal of the motor 14 through the switch 51a, and the source of the FET 33c and the drain of the FET 33d are connected to the negative terminal of the motor 14 through the switch 51b. Yes. The switches 51a and 51b are connected to the switches 44a and 44b via the communication harness 45, respectively. The switch 51a is switched between a normal position (illustrated) for connecting the FETs 33a and 33b and the motor 14 and a failure position for connecting the switch 44a and the motor 14. The switch 51b is switched between a normal position (illustrated) for connecting the FETs 33c and 33d and the motor 14 and a failure position for connecting the switch 44b and the motor 14.

  The switch 44a is switched between a normal position (shown) where the FETs 43a, 43b and the motor 24 are connected, and a failure position where the FETs 43a, 43b and the switch 51a are connected. The switch 44b is switched between a normal position (shown) where the FETs 43c and 43d and the motor 24 are connected and a failure position where the FETs 43c and 43d and the switch 51b are connected.

  When the failure of the driver 31 is detected, the CPU 2A controls the switches 51a and 51b to switch from the normal position to the failure position, and controls the switches 44a and 44b to switch from the normal position to the failure position. . Thereby, when the driver 31 on the driver's seat side breaks down, the driver's seat side driver 41 controls the driver's seat side motor 14.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, when the driver 31 on the driver's seat side breaks down, a switch is provided so that the driver's seat side driver 41 controls the driver's seat side motor 14. However, there is no such switch. May be. In this case, the circuit configuration of the seat belt retracting system 1 can be simplified.

1 Seat belt retracting system 2 ECU (common control means)
11 Seat belt retractor (first seat belt retractor)
12 Seat belt (first seat belt)
13 Spool (first spool)
14 Motor (first motor)
21 Seat belt retractor (second seat belt retractor)
22 Seat belt (second seat belt)
23 Spool (second spool)
24 motor (second motor)
31 Driver 32 Driver 44a Switch (switching means)
44b switch (switching means)
45 Harness for communication (switching means)
50a switch (switching means)
50b switch (switching means)
51a switch (switching means)
51b switch (switching means)

Claims (3)

A first seat belt retractor having a first spool that winds up the first seat belt provided on the driver's seat side and a first motor that rotates the first spool;
First motor driving means for driving the first motor;
A second seat belt retractor having a second spool that winds up a second seat belt provided on a seat side other than the driver's seat, and a second motor that rotates the second spool;
Second motor driving means for driving the second motor;
One common control means for commonly controlling the first motor driving means and the second motor driving means ;
Switching means for turning on / off the driving of the first motor by the second motor driving means ,
The seat belt retracting system, wherein the common control means is provided in the first seat belt retractor. In claim 1 Symbol mounting seat belt winding system,
The first motor driving means includes
A motor drive circuit board comprising a driver for driving the first motor;
The second motor driving means includes
A seat belt winding system comprising a motor drive circuit board including a driver for driving the second motor. In the seat belt winding system according to claim 1 or 2 ,
The first motor driving means and the second motor driving means are:
A seat belt retracting system, wherein the seat belt retractor is provided in the first seat belt retractor together with the common control means.

Images