WO2008069067A1

WO2008069067A1 - Seat belt take-up control device, seat belt take-up device, seat belt device, seat belt take-up control method, and program

Info

Publication number: WO2008069067A1
Application number: PCT/JP2007/072919
Authority: WO
Inventors: Masato Takao; Koji Tanaka
Original assignee: Takata Corporation
Priority date: 2006-12-07
Filing date: 2007-11-28
Publication date: 2008-06-12
Also published as: JP2008143275A

Abstract

A control parameter set value table (201) is stored, at every changing levels indicating the levels of operation efficiency drops of a retractor, with the set values of control parameters for controlling a motor. A set value changing condition table (202) is stored, at every changing levels, with the set value changing conditions of the control parameters. A deterioration information acquiring unit (301) acquires the deterioration information of the retractor such as a winding operation number. A set value change discriminating unit (302) refers to the set value changing condition table (202), and reads out the changing level of the set value changing condition, in case the deterioration information satisfies that condition. A set value changing unit (303) makes such a set value of the read changing level effective for the control parameter as is stored by the control parameter set value table (201).

Description

Specification

Seat belt winding control device, seat belt winding device, seat belt device, seat belt winding control method, and program

Technical field

TECHNICAL FIELD [0001] The present invention relates to a seat belt winding control device that controls winding of a seat belt, a seat bell rod winding device, a sieve bell rod winding device, a sieve bell rod winding control method, and a program.

Background art

A seat (seat) of a vehicle such as an automobile is provided with a seat belt (seat belt) device for holding an occupant in the seat. This seat belt device includes a belt (webbing), a buckle, a tanda plate, a retractor, and the like.

Among these, the retractor is a device for winding a belt (seat belt winding device). In addition to a take-up mechanism using panel force, the retractor is equipped with a pretensioner that moves the piston by an explosive explosive in an emergency such as a vehicle collision and pulls the belt strongly to restrain the occupant to the seat. Furthermore, in recent years, there is a motor retractor that includes a motor and can wind the belt by the motor.

In the motor retractor, in order to reduce power consumption, power is supplied to the motor when the belt is wound, and when the winding is completed, the power supply to the motor is stopped and the motor is stopped. However, for example, even when the belt is being wound, if the belt is caught on the occupant's arm or the like, or if the occupant starts to pull out the belt during winding, the motor is stopped, and then The motor should be properly controlled.

[0005] Assuming such a case, it is possible to appropriately deal with both the seat belt hooking without using a special sensor and the occupant pulling out of the seat belt during winding. There is an invention of a motor retractor that can be used (for example, see Patent Document 1). Specifically, in the motor retractor disclosed in Patent Document 1, when an overload is detected during seat belt winding, the motor retractor stops winding and waits for a predetermined time. Performs winding operation. Patent Document 1: JP 2005-280497 A

Disclosure of the invention

Problems to be solved by the invention

[0006] By the way, the motor retractor may have lower operating efficiency due to aging of the motor and the mechanism part. In that case, the power transmission loss in the motor and the mechanism part increases, and the seat retractor is retracted. The motor current value may increase. In such a case, if the invention of the above-mentioned Patent Document 1 is used, the force S that is appropriately judged so that the winding is temporarily interrupted with respect to the hooking force, and the hooking force Even if it was a force load that was not detected, there was a risk that the winding would stop after it was judged to be a hooking force, a brittleness, etc.

[0007] In the motor retractor, the seat belt retracting speed is controlled by voltage. For this reason, when the power transmission loss in the motor or mechanism increases due to deterioration over time, the winding speed may become slow even at the same voltage value as before deterioration.

[0008] The present invention has been made in view of the above situation, and even when the efficiency of the seat belt retracting operation by the motor is reduced, the seat belt retracting operation can be appropriately executed. It is an object to provide a belt winding control device, a seat belt winding device, a seat belt device, a seat belt winding control method, and a program. Means for solving the problem

[0009] In order to achieve the above object, a seat belt retractor according to the first aspect of the present invention includes:

A motor control value storage unit for storing a motor control value for controlling a motor used for winding the seat belt;

A deterioration information acquisition unit for acquiring deterioration information of a seat belt retractor including the motor;

An operation efficiency determination unit that determines whether or not the operation efficiency of the seat belt retractor has been reduced based on the deterioration information acquired by the deterioration information acquisition unit;

When the operation efficiency determining unit determines that the operation efficiency of the seat belt retractor has decreased, the motor control value stored in the motor control value storage unit is used to determine the operation of the seat belt retractor. To be closer to the operation when the A motor control value changing unit to be changed,

Is provided.

[0010] For example, the motor control value stored in the motor control value storage unit is a voltage control value for controlling a voltage value of the motor that determines a winding speed of the seat belt. The motor control value change unit Is stored in the motor control value storage unit so as to increase the voltage value of the motor when the operation efficiency determination unit determines that the operation efficiency of the sieve bell reel winding device has decreased. Change the voltage control value.

For example, the motor control value stored in the motor control value storage unit is a hook that is a threshold value of a current value of the motor for detecting the hook of the seat belt during winding of the seat belt. Current threshold for force detection

The motor control value changing unit is configured to store the trap stored in the motor control value storage unit when the operation efficiency determination unit determines that the operation efficiency of the sieve reel winding device has decreased. Increase the threshold for detecting the applied force and shear.

[0012] For example, the motor control value stored in the motor control value storage unit is a current value for restraint that is a current value of the motor for determining the tension of the seat belt when restraining an occupant,

The motor control value changing unit is configured to store the restraint stored in the motor control value storage unit when the operation efficiency determination unit determines that the operation efficiency of the sieve bell kite winding device has decreased. Increase the current value.

[0013] For example, the deterioration information acquisition unit acquires the number of operations of the sheet belt take-up device as deterioration information,

The operation efficiency determination unit determines that the operation efficiency of the seat belt retractor has decreased when the number of operations acquired by the deterioration information acquisition unit exceeds a predetermined number.

[0014] For example, the deterioration information acquisition unit acquires a use time of the seat belt retractor as deterioration information,

The operation efficiency determination unit determines that the operation efficiency of the seat belt retractor has decreased when the usage time acquired by the deterioration information acquisition unit has exceeded a predetermined time. For example, the deterioration information acquisition unit acquires a value of the inrush current of the motor as deterioration information,

The operation efficiency determination unit determines whether or not the operation efficiency of the seat belt retractor has decreased based on the value of the inrush current acquired by the deterioration information acquisition unit.

For example, the deterioration information acquisition unit acquires the current value of the motor during winding of the seat belt as deterioration information,

The operation efficiency determination unit determines whether or not the operation efficiency of the seat belt retractor has decreased based on the current value acquired by the deterioration information acquisition unit.

[0017] For example, the seat belt winding control device includes a supply voltage value acquisition unit that acquires a supply voltage value supplied to the seat belt winding device;

A supply voltage value determination unit for determining whether or not the supply voltage value acquired by the supply voltage value acquisition unit is smaller than a predetermined voltage value;

The voltage control value stored in the motor control value storage unit is changed so as to increase the voltage value of the motor when the supply voltage value determination unit determines that the supply voltage value is smaller than a predetermined voltage value. And a voltage control value changing unit.

[0018] For example, an ambient temperature acquisition unit that acquires an ambient temperature of the seat belt retractor;

A temperature determining unit for determining whether or not the ambient temperature acquired by the ambient temperature acquiring unit is higher than a predetermined temperature;

Voltage control value change for changing the voltage control value stored in the motor control value storage unit so as to decrease the voltage value of the motor when the temperature determination unit determines that the ambient temperature is higher than a predetermined temperature. A section.

[0019] The seat belt retractor according to the second aspect of the present invention provides:

A motor,

A winding mechanism that winds up the seat belt using the rotation of the motor; a motor control value storage that stores a motor control value for controlling the motor; and deterioration information of the winding mechanism A deterioration information acquisition unit; Based on the deterioration information acquired by the deterioration information acquisition unit, an operation efficiency determination unit for determining whether or not the efficiency of the seat belt winding operation has decreased, and

When the operation efficiency determination unit determines that the efficiency of the seat belt winding operation has decreased, the motor control value stored in the motor control value storage unit is used as the efficiency of the seat belt winding operation. A motor control value changing unit that changes so that it approaches the operation when the

Prepare;

In addition, the seat belt device according to the third aspect of the present invention provides:

A fixing member for fixing one end of the seat belt;

A seat belt retractor comprising a seat belt retractor, connected to the other end of the seat belt, and retracting the seat belt;

An engagement member through which the seat belt is threaded and slidably supported;

A knock nose that is disposed on the side facing the fixing member across the sheet and engages with the engaging member;

A guide member disposed above the fixing member, through which the seat belt is passed, and for slidably supporting the seat belt;

With

The seat belt winding control device includes:

Motor control value storage means for storing a motor control value for controlling a motor used for winding the seat belt;

An operating efficiency determining means for determining whether or not the operating efficiency of the seat belt retractor is lowered based on the deterioration information acquired by the deterioration information acquiring means;

When the operation efficiency determining unit determines that the operation efficiency of the seat belt retractor has decreased, the motor control value stored in the motor control value storage unit is used as the operation of the seat belt retractor. The motor control value changing means section to be changed so that the operating efficiency is lowered! / ,! Is provided.

[0021] Further, a seat belt winding control method according to a fourth aspect of the present invention includes:

A deterioration information acquisition step for acquiring deterioration information of a seat belt retractor including a motor used for winding the seat belt;

A condition reading step of reading out the condition from a storage unit that stores the condition of deterioration information indicating that the operating efficiency of the seat belt retractor has decreased;

A condition determining step for determining whether the deterioration information acquired in the deterioration information acquiring step satisfies the condition read in the condition reading step;

When it is determined that the deterioration information satisfies the condition in the condition determining step, the initial value of the motor control value for controlling the motor is set, and the operation of the seat belt retractor is not reduced in operating efficiency. A motor control value change step for changing to a change value to approximate the operation of

Prepare;

[0022] A program according to a fifth aspect of the present invention is:

On the computer,

An operation efficiency determination step for determining whether or not the operation efficiency of the seat belt retractor has decreased based on the deterioration information acquired in the deterioration information acquisition step;

When it is determined in the operation efficiency determination step that the operation efficiency of the seat belt retractor has decreased, a motor control value for controlling the motor stored in the storage unit is obtained as the seat belt retractor. Motor control value changing step to change the operation of the motor so that the operation efficiency drops to V, na! /

Is executed.

The invention's effect

[0023] According to the present invention, the seat belt retracting operation can be appropriately executed even when the efficiency of the seat belt retracting operation by the motor is reduced.

Brief Description of Drawings FIG. 1 is a diagram schematically showing a configuration example of a seat belt device including a retractor according to a first embodiment of the present invention.

FIG. 2 is a diagram schematically showing a configuration example of a retractor according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration example of a controller and a connection state thereof in the first embodiment of the present invention.

FIG. 4 is a diagram showing an example of a data structure of a control parameter set value table in the first exemplary embodiment of the present invention.

FIG. 5 is a diagram showing an example of a data structure of a set value change condition table in the first embodiment of the present invention.

FIG. 6 is a block diagram showing a functional configuration example of an ECU having a control parameter adjustment unit in the first embodiment of the present invention.

FIG. 7 is a flowchart showing a control parameter adjustment process in the first embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration example of a controller and a connection state thereof in the second embodiment of the present invention.

FIG. 9 is a diagram showing an example of a data structure of a set value change condition table in the second embodiment of the present invention.

FIG. 10 is a diagram showing an example of a data structure of a set value change condition table in the third embodiment of the present invention.

FIG. 11 is a diagram showing an example of a data structure of a set value change condition table in the fourth embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration example of a controller and a connection state thereof in the fifth embodiment of the present invention.

FIG. 13 is a diagram showing a data structure example of a control parameter adjustment table in the fifth embodiment of the present invention.

FIG. 14 is a block diagram showing a configuration example of a controller and a connection state thereof in the sixth embodiment of the present invention.

FIG. 15 is a data structure of a control parameter adjustment table in the sixth embodiment of the present invention. It is a figure which shows a construction example.

Explanation of symbols

1 Retractor

2 Benole

3 Benoleto anchor

4 Guide anchor

5 Tangfu. Rate

6 / Cook / Les

7 Seat belt sensor

8 Power supply

9 Collision sensor

11 frames

12 Spunore

13 Suhu. Ring

14 Motor

15 Power transmission mechanism

16 controller

161 Motor driver

162 Current sensor

163 ECU

164 Data storage

201 Control parameter setting value table

202, 402, 501, 601 Setting value change condition table

301 Degradation information acquisition unit

302 Setting value change discriminator

303 Set value change section

401 timer

701 Power supply voltage sensor 702, 802 Control parameter adjustment table

801 Temperature sensor

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the following, the embodiment will be described by taking a retractor (seat belt retractor) equipped with a controller (seat belt retractor) for controlling the motor as an example.

[0027] [First embodiment]

FIG. 1 is a diagram schematically illustrating a configuration example of a seat belt device including a retractor according to the first embodiment of the present invention.

The seat belt device is provided in the seat of the vehicle. As shown in the drawing, the retractor 1, the benolet 2, the benolet anchor 3, the guide anchor 4, the tanda plate 5, the knock nore 6 And get rid of.

[0028] The retractor 1 is a device that winds up the belt 2, and is fixed inside the side surface of the vehicle body.

The retractor 1 according to the present embodiment is a motor retractor that includes a motor and can take up the belt 2 with the power of the motor.

The belt 2 is for restraining an occupant to the seat, and one end is attached to the retractor 1.

[0029] The belt anchor 3 is for fixing one end of the belt 2 to the floor (or seat) of the vehicle body, and is attached to the end of the belt 2 opposite to the end where the retractor 1 is attached. ing.

The guide anchor 4 is for folding the belt 2 in the vicinity of the occupant's shoulder. The belt 2 is passed through, and the belt 2 is slidably supported and fixed to the side surface of the vehicle.

[0030] The tanda plate 5 is engaged with the buckle 6 when the occupant wears the seat belt, and is slidably supported by the belt 2 folded back by the guide anchor 4.

The knock 6 is fixed to the seat (or the floor of the vehicle body), and the tongue plate 5 is engaged in a detachable manner in the vicinity of the waist of the occupant. In addition, the knock 6 detects whether the seat belt is attached or released by detecting engagement with the tanda plate 5. Sensor 7 is provided. The seat belt mounting sensor 7 outputs the detected signal to the retractor 1 via the cord.

When the occupant is seated, the occupant pulls out the belt 2 from the retractor 1 and inserts the tanda plate 5 into the buckle 6 to fix it. As a result, the seat belt is attached to the occupant, and the occupant is restrained to the seat by the seat belt.

The occupant removes the tanda plate 5 from the buckle 6 when leaving the seat. At this time, the retractor 1 detects that the seat belt has been released based on a signal from the seat belt attachment sensor 7, and drives the motor to wind up the belt 2 drawn from the retractor 1.

FIG. 2 is a diagram schematically showing a configuration example of the retractor 1 according to the present embodiment.

Retractor 1 is frame 11 and sufu as shown. It has a single pin 12, a spring rod, a motor 14, a power transmission mechanism 15 and a controller 16.

[0033] The frame 11 is a framework of the retractor 1 and is substantially U-shaped.

The spool 12 is for winding up the belt 2, and is wound around the belt 2 and is rotatably supported by the frame 11. The belt 2 is wound around the retractor 1 as the spool 12 rotates.

The spring portion 13 constantly biases the spool 12 in the winding direction by a spring force, is supported by the frame 11, and is connected to the spool 12 via the power transmission mechanism portion 15.

The motor 14 is an electric motor for rotating the spool 12 and is supported by the frame 11.

The power transmission mechanism 15 is for shifting the power of the motor 14 and transmitting it to the spool 12 and is supported by the frame 11. Specifically, the power transmission mechanism 15 includes a spool-side pulley fixed to the rotating shaft of the spool 12, a motor-side pulley fixed to the rotating shaft of the motor 14, a timing belt for connecting both pulleys, etc. The rotation of the motor 14 is transmitted to the spool 12.

The controller 16 is for controlling the drive of the motor 14 and is supported by the frame 11. The controller 16 is connected to a motor 14, a power supply for supplying driving power to the motor 14, a seat belt wearing sensor 7, a collision sensor, and the like via a cord. FIG. 3 is a block diagram illustrating a configuration example of the controller 16 and a connection state thereof.

The controller 16 includes a motor driver 161, a current sensor 162, an ECU (

Electronic Control Unit) 163 and a data storage unit 164.

[0037] The motor driver 161 is connected to the power supply 8, and a power supply voltage is applied from the power supply 8.

. The power source 8 is an in-vehicle battery or the like. The motor driver 161 drives the motor 14 by applying a voltage to the motor 14 under the control of the ECU 163.

The current sensor 162 is installed between the motor driver 161 and the motor 14 and detects the value of the current flowing through the motor 14. The current sensor 162 outputs the detected current value to the ECU 163.

[0039] ECU163 is a motor driver according to the control parameters for controlling motor 14.

161 is controlled, and the motor 14 is controlled via the motor driver 161. Specifically, the ECU 163 controls the rotation of the motor 14 by a PWM (Pulse Width Modulation) method. Therefore, ECU 163 generates a PWM signal having a predetermined duty ratio in accordance with the control parameter, and outputs the generated PWM signal and a control signal for instructing the rotation direction of motor 14 to motor driver 161. The motor driver 161 applies a drive voltage obtained by adjusting the power supply voltage with a PWM signal to the motor 14. As a result, the motor 14 rotates at a speed based on the duty ratio, and the belt 2 is wound around the spool 12.

[0040] Further, ECU 163 determines whether or not the operating efficiency of retractor 1 has decreased due to aging or the like, and adjusts (corrects) the control parameter when determining that the operating efficiency has decreased.

Yes

The ECU 163 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. Specifically, the control process of the motor driver 161 and the adjustment process of the control parameters by the ECU 163 are performed by temporarily storing various data using the CPU power RAM as a work area, and executing a control program stored in the ROM. This is done by executing. Note that these processes performed by the ECU 163 will be described later.

The data storage unit 164 stores various types of information, and includes a data rewritable memory such as an EEPROM (Electrically Erasable PROM) and a flash memory. Specifically, the data storage unit 164 stores a control parameter set value table 201 and a set value change condition table 202.

FIG. 4 is a diagram showing an example of the data structure of the control parameter set value table 201.

The control parameter setting value table 201 stores control parameter setting values used for controlling the motor driver 161. As shown in the figure, the control parameter setting value table 201 sets the change level, the setting value for each control parameter, and the valid flag. Are stored in association with each other.

The change level is information indicating a level for changing the set value of the control parameter. The EC U163 determines a decrease in the efficiency of the seat belt retracting operation by level, and changes the setting value of the control parameter according to the level. For example, the ECU 163 initially controls the motor 14 using the set value of the control parameter in the initial column. When the operating efficiency drops to some extent, the motor 14 is controlled using the set value of the control parameter in the first change column. When the operation efficiency further decreases, the ECU 163 uses the control parameter setting value in the second change column, and when the operation efficiency decreases further, the ECU 163 uses the control parameter setting value in the third change column.

[0045] The valid flag is 1-bit information indicating which change level control parameter setting value is currently valid. For example, a flag is set in the effective flag field of the control parameter to be used at present, and the value “1” is set. On the other hand, the value “0” is set in the valid flag field of the control parameter that should not be used at present. The ECU 163 reads the control parameter setting value with the valid flag value “1” from the control parameter setting value table 201 and controls the motor 14.

[0046] The control parameter winding duty ratio is the speed at which retractor 1 winds belt 2

This is a control parameter for controlling (belt winding speed).

The voltage applied to the motor; L4 is determined by the PWM signal generated based on the setting of the winding duty ratio. The higher the voltage applied to the motor 14, the higher the belt winding speed (belt retracting speed). For this reason, the belt winding speed is controlled by the winding duty ratio.

[0047] The current threshold value for detecting the catching force and tension is a control for stopping the winding operation by the retractor 1 when the belt 2 is caught by an occupant or the like while the belt 2 is being wound by the retractor 1. It is a control parameter.

If the belt 2 is caught by an occupant or the like while the belt 2 is being wound by the drive of the motor 14, the load applied to the motor 14 increases and the motor current increases. Therefore, the setting value of the threshold value for hooking force and detection of the current is larger than the value of the motor current when the winder 2 is wound up by the occupant and the like without the hooking force! Is set in advance. Retractor 1 assumes that belt 2 has been caught by an occupant, etc. when the value S of the motor current during winding of the belt, the catching force, or the current threshold value for detection of the belt exceeds the set value. Stop the winding operation.

The occupant restraining current value is a control parameter for controlling the tension of the seat belt (occupant restraining tension) for restraining the occupant in an emergency such as a vehicle collision.

In an emergency, retractor 1 pulls belt 2 firmly and restrains the passenger to the seat with a constant tension of the seat belt. The tension of the seat belt based on the torque of the motor 14 increases as the motor current increases. For this reason, the tension of the seat belt is controlled by the occupant restraint current value.

FIG. 5 is a diagram showing an example of the data structure of the set value change condition table 202.

As shown in the figure, the set value change condition table 202 includes a set value change condition for changing the set value in association with the change level of the set value of the control parameter, and a changed flag indicating whether or not it has been changed. And memorize.

Specifically, ECU 163 determines a decrease in the efficiency of the seat belt retracting operation based on the number of retracting operations of retractor 1. As the number of winding operations increases, the mechanical parts such as the motor 14, the power transmission mechanism 15 and the spool 12 deteriorate, and as a result, the operation efficiency decreases. The ECU 163 refers to this set value change condition table 202, and when the number of winding operations exceeds the number of operations indicated in the set value change condition, the ECU 163 considers that the operation efficiency has decreased, and Adjust the setting value.

[0051] For example, the ECU 163 changes (adjusts) the first set value when the number of winding operations of the retractor 1 reaches 30,000, and when the number reaches 60,000, Change the set value for the third time, and change the set value for the third time when it reaches 90,000 times.

[0052] The changed flag indicates whether the setting value of the control parameter has been changed for each change level. 1-bit information indicating whether or not. For example, the changed flag is set to “0” as an initial value. When the number of retracting operations of the retractor 1 satisfies the set value change condition, a changed flag of the change level that satisfies the set value change condition is set and set to the value “1”.

Returning to FIG. 3, the ECU 163 receives signals from the seat belt wearing sensor 7, the collision sensor 9, and the current sensor 162. Here, the collision sensor 9 is a sensor that detects a vehicle collision (or a predicted collision), and is provided in front of the vehicle. The collision sensor 9 is connected to the controller 16 via a cord, and outputs a collision detection signal to the ECU 163 when a collision is detected.

The ECU 163 receives the input signals from the seat belt wearing sensor 7, the collision sensor 9, and the current sensor 162 and the set values in the control parameter set value table 201 stored in the data storage unit 164. Based on this, the control process of the motor driver 161 is performed.

For example, when the ECU 163 detects the release of seat belt attachment based on a signal from the seat belt attachment sensor 7, the control parameter setting value table 201 determines the take-up duty ratio of the change level of the effective flag force “1”. Reads the set value and generates a PWM signal with the read duty ratio. ECU 163 outputs the generated PWM signal and a control signal for rotating motor 14 in the winding direction to motor driver 161. As a result, the motor 14 rotates and the belt 2 is wound at a winding speed corresponding to the set value of the winding duty ratio.

Further, when the winding of the belt 2 starts, the ECU 163 starts to change the bow I hooking force at the change level with the effective flag “1” from the control parameter setting value table 201, the current threshold for detecting the current! /, Read the set value. Then, the ECU 163 compares the motor current value detected by the current sensor 162 with the catching force and the current threshold value for detecting the tension while the belt 2 is being wound up. When the current detection threshold is exceeded, the motor driver 161 is instructed to stop driving, and the rotation of the motor 14 is stopped. As a result, if the belt 2 is caught by an occupant during the winding operation by the retractor 1, the winding operation is stopped.

Yes

[0057] Furthermore, when the ECU 163 receives a collision detection signal from the collision sensor 9, the ECU 163 Read the setting value of the current value for occupant restraint at the change level where the valid flag is “1” from the setting value table 201. The ECU 163 performs feedback control so that the motor current value detected by the current sensor 162 becomes the occupant restraining current value. Specifically, when the motor current value is smaller than the occupant restraining current value, the ECU 163 increases the duty ratio to increase the voltage applied to the motor 14, and the motor current value is larger than the occupant restraining current value. If so, reduce the voltage applied to the motor 14 by decreasing the duty ratio. As a result, at the time of a collision, the occupant is restrained by the seat belt by the seat belt with a constant tension corresponding to the set value of the occupant restraining current value.

Note that the ECU 163 reads the setting values of each control parameter from the control parameter setting value table 201 in a lump when, for example, the ignition key of the vehicle is turned ON! /, RAM setting It may be stored in the value register! /.

Next, control parameter adjustment processing executed by the ECU 163 will be described.

The retractor 1 winds up the belt 2 by transmitting the power of the motor 14 to the spool 12 via the power transmission mechanism 15. Therefore, by repeating the winding operation of the belt 2, the mechanical parts such as the motor 14, the power transmission mechanism 15 and the spool 12 gradually deteriorate, and the power transmission loss increases. That is, when the retractor 1 deteriorates over time, the internal power transmission loss increases, and the efficiency of the belt winding operation decreases.

[0060] Specifically, when the loss of power transmitted to the spool 12 in the motor 14 force also increases, the load applied to the motor 14 increases.

Therefore, after the operating efficiency is lowered, even when the same drive voltage as that before the operating efficiency is reduced is applied to the motor 14, the belt winding speed becomes smaller than before the operating efficiency is reduced.

[0061] Further, when the load applied to the motor 14 increases, the motor current increases. Therefore, in detecting the hook force during winding of the belt, the detection of the hook force, Even if it is a force that is not detected and a load, it may happen that a hooking force is detected after the operation efficiency.

[0062] Therefore, ECU 163 determines a decrease in operating efficiency based on the deterioration information indicating the deterioration state of retractor 1. If ECU 163 determines that the operating efficiency has decreased, control parameter is set so as to cancel the influence of the decrease in operating efficiency. Control parameter stored in the setting value table 201 Adjust (change) the setting value.

[0063] For example, the belt winding speed decreases as the operating efficiency decreases. Therefore, as shown in the example of the control parameter setting value table 201 in FIG. 4, the winding duty ratio is changed to a level at which the operating efficiency decreases. Increase gradually according to the conditions. As a result, even when the operation efficiency is deteriorated due to deterioration over time, the belt winding speed can be kept substantially constant and the change can be minimized.

[0064] Further, the motor current during winding increases due to an increase in load due to a decrease in operating efficiency. Therefore, if the hooking force and the current threshold for detecting the load are constant, even if a load that is not detected as a hook before the operating efficiency is lowered, it is determined that the hook is a hooked force or a resistor after the operating efficiency is lowered. It may be done.

Therefore, as shown in the example of the control parameter setting value table 201 in FIG. 4, the catching force and the current threshold value for detecting the drag are reduced so as to bring the judgment criterion of the catch detection closer to the initial reference. Increase gradually according to the change level. As a result, even if the operating efficiency decreases due to deterioration over time, it is possible to keep the reference of the load applied to the motor 14 by the hooking force and the force almost constant, and the change can be minimized. .

[0065] When the operating efficiency decreases and the load applied to the motor 14 increases, the initial occupant restraining current value decreases the tension of the belt 2 by the increased load.

Therefore, in order to bring the occupant restraint tension in an emergency closer to the initial tension, as shown in the example of the control parameter setting value table 201 of FIG. And gradually increase it. Note that 0 is Ial <Ia2 Ia3 Ia4.

In this way, by changing the control parameter, the retractor 1 can perform an operation close to a constant operation without almost reducing the operation efficiency.

FIG. 6 is a block diagram illustrating a functional configuration example of the ECU 163 having the control parameter adjustment unit.

The ECU 163 includes a deterioration information acquisition unit 301, a set value change determination unit 302, and a set value change unit 303, as illustrated.

Deterioration information acquisition unit 301 acquires the deterioration information of retractor 1. Specifically, deterioration information The information acquisition unit 301 acquires the number of winding operations of the retractor 1 as deterioration information. For example, the deterioration information acquisition unit 301 counts the number of times each time the ECU 163 outputs a control signal instructing the motor driver 161 to perform winding, and stores the number of operations in the RAM.

[0069] Note that the number of operations may be acquired by counting seat belt release cancellation based on a signal from the seat belt attachment sensor 7.

Further, the deterioration information acquisition unit 301 may store the acquired deterioration information in the data storage unit 164 and read and acquire it during the control parameter adjustment processing.

The set value change determining unit 302 is a control parameter stored in the control parameter 201 based on the deterioration information acquired by the deterioration information acquiring unit 301 and the set value change condition stored in the set value change condition table 202. It is determined whether or not to change the set value.

Specifically, when the deterioration information is input from the deterioration information acquisition unit 301, the set value change determination unit 302 refers to the set value change condition table 202, and the deterioration information is set to the changed flag “0”. It is determined whether or not a value change condition is satisfied. If the condition is satisfied, the set value change determining unit 302 determines that the set value is to be changed, assuming that the operating efficiency of the retractor 1 has decreased. In other words, the set value change determination unit 302 determines whether or not the operating efficiency of the retractor 1 has decreased.

[0071] When the set value change determining unit 302 determines that the set value of the control parameter is to be changed, the set value change determining unit 302 reads from the set value change condition table 202 V, the change level information that satisfies the set value change condition, and changes the set value. Output to part 303. Further, the set value change determination unit 302 sets the changed flag of the change level that satisfies the set value change condition to “1” in the set value change condition table 202.

[0072] When setting level change information is input from setting value change determination unit 302, setting value changing unit 303 sets the effective flag of the change level to "1" in control parameter setting value table 201, and sets other values. Set the change level valid flag to "0".

[0073] When the seat belt is retracted, the ECU 163 reads from the control parameter setting value table 201 the setting value of the control parameter at the change level where the valid flag is set to "1", and based on the setting value Control motor 14.

For this reason, after the operating efficiency of retractor 1 decreases, It is changed so that the operation close to the operation of retractor 1 when the efficiency is not lowered is executed. Therefore, even when the operating efficiency is lowered, the retractor 1 can operate with reduced operating efficiency! /, N! /, Sometimes close! /.

FIG. 7 is a flowchart showing a control parameter adjustment process according to the present embodiment.

This control parameter adjustment process is started, for example, when the winding of the belt 2 is completed. Note that this may be performed, for example, when the idle switch is turned on.

First, deterioration information acquisition section 301 acquires the number of winding operations of retractor 1 as deterioration information (step Sl).

Next, the set value change determination unit 302 determines whether or not all changed flags in the set value change condition table 202 are “1” (step S2).

If all the changed flags are “1” (step S 2; YES), the control parameter setting value cannot be changed any more, and the control parameter adjustment process is terminated. When all the changed flags are not “1” (step S2; NO), the set value change determination unit 302 reads the change level from the set value change condition table 202 within the change levels where the changed flag is “0”. Reads the setting value change condition with minimum (step S3).

Next, the set value change determination unit 302 determines whether or not the number of winding operations acquired in step S1 is equal to or greater than the number of operations of the set value change condition (step S4).

If the number of take-up operations is not greater than the set value change condition operation count (Step S4

; NO), it is assumed that the operating efficiency has not decreased, and this control parameter adjustment process is terminated.

[0078] When the winding operation count is equal to or greater than the set value change condition operation count (step S4; Y ES), the set value change determining unit 302 reads the setting read from the set value change condition table 202 in step S3. Read the change level corresponding to the value change condition (step S5).

Further, the set value change determination unit 302 sets the changed flag of the set value change condition table 202 corresponding to the read change level to “1” (step S6).

Subsequently, the set value changing unit 303 accesses the control parameter set value table 201, sets the valid flag corresponding to the change level read in step S5 to “1”, and sets other valid flags. Set to `` 0 '' (step S7) and finish this control parameter adjustment process To do.

With the above control parameter adjustment processing, it is possible to determine a decrease in the operating efficiency of the retractor 1 based on the number of winding operations that indicate the deterioration state of the retractor 1. The control parameter setting value can be adjusted at a level according to the degree of decrease in operating efficiency.

[0081] [Second Embodiment]

In the first embodiment, the number of retracting operations of the retractor 1 is used as deterioration information for determining a decrease in operating efficiency of the retractor 1. However, the deterioration information is not limited to this.

Therefore, a case where the usage time of the retractor 1 is used as the deterioration information of the retractor 1 will be described as a second embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration example of the controller 16 and a connection state thereof in the second embodiment of the present invention. In FIG. 8, the same components as those shown in FIG. 3 in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the present embodiment, as shown in the figure, in addition to the components in the first embodiment, a timer 401 is provided.

The timekeeping unit 401 records the date and time, and is a clock circuit or the like provided in the vehicle. The timekeeping unit 401 is connected to the controller 16 via a cord and outputs the current date / time information to the ECU 163. Make sure that the controller 16 has a timer such as a built-in timer.

The data storage unit 164 stores the use start date and time of the retractor 1. When acquiring deterioration information, the deterioration information acquisition unit 301 of the ECU 163 in the present embodiment reads the use start date and time from the data storage unit 164, for example, and reads the read use start date and time from the time measuring unit 401. The usage time is obtained by subtracting from the date and time information.

Further, the set value change condition table in the present embodiment is different from the set value change condition table 202 in the first embodiment in the set value change conditions.

FIG. 9 shows data in the set value change condition table 402 according to the second embodiment of the present invention. FIG.

[0086] When determining whether or not to change the set value of the control parameter, the set value change determining unit 302 refers to the set value change condition table 402, and for example, the usage time of the retractor 1 is 5 years or more. Sometimes, the first set value change (adjustment) is performed. When it is over 10 years, the second set value is changed. When it is over 15 years, the third set value is changed. Is determined to be

[0087] According to the second embodiment of the present invention, it is possible to determine a decrease in the operating efficiency of the retractor 1 based on the usage time indicating the deterioration state of the retractor 1. Then, the set value of the control parameter can be adjusted by the level according to the degree of decrease in operating efficiency.

[0088] [Third embodiment]

Further, the inrush current value of the motor 14 can also be used as deterioration information for determining a decrease in the operating efficiency of the retractor 1.

Therefore, the case where the value of the inrush current of the motor 14 is used as the deterioration information of the retractor 1 will be described as a third embodiment of the present invention.

[0089] Deterioration information acquisition section 301 of ECU 163 in the present embodiment extracts and acquires the value of inrush current from the current value input from current sensor 162 as deterioration information. It is also possible to store the values of the most recent inrush currents, obtain the average value (including the weighted average value), and use it as deterioration information.

In addition, the set value change condition table in the present embodiment is different from the set value change condition tables 202 and 402 in the first and second embodiments. FIG. 10 is a diagram showing an example of the data structure of the set value change condition table 501 in the third embodiment of the present invention.

[0091] The set value change determination unit 302 refers to this set value change condition table 501 when determining whether or not to change the set value of the control parameter. For example, when the inrush current is IM [A] or more, The first set value is changed (adjusted). When Ib2 [A] or higher, the second set value is changed. When Ib3 [A] or higher, the third set value is set. It is almost the same as that for changing the value. Note that 0 <Ibl <Ib2 <Ib3.

[0092] According to the third embodiment of the present invention, the collision of the motor 14 indicating the deterioration state of the retractor 1 is described. A decrease in the operating efficiency of the retractor 1 can be determined based on the value of the incoming current. Then, the force S is used to adjust the set value of the control parameter to the level according to the degree of decrease in operating efficiency.

[0093] [Fourth embodiment]

Further, the average of the current of the motor 14 during the belt winding operation can be used as the deterioration information for determining the reduction in the operating efficiency of the retractor 1.

Therefore, a case where the average value of the current of the motor 14 during the belt winding operation is used as the deterioration information of the retractor 1 will be described as a fourth embodiment of the present invention.

[0094] The deterioration information acquisition unit 301 of the ECU 163 in the present embodiment stores, for example, the current value input from the current sensor 162 at predetermined time intervals during the belt winding operation, and the belt winding operation is completed. Then, the average value of the stored current values is obtained and acquired as deterioration information.

Further, the set value change condition table in the present embodiment is different from the set value change condition tables 202, 402, 501 in the first to third embodiments in FIG. FIG. 20 is a diagram showing a data structure example of a set value change condition table 601 in the fourth embodiment.

[0096] When determining whether or not to change the set value of the control parameter, the set value change determining unit 302 refers to this set value change condition table 601, and, for example, the average current during the winding operation is Icl [A ] When the above is set, change (adjust) the first set value. When Ic2 [A] or higher, change the second set value. When Ic3 [A] or higher, It is determined that the third set value change is performed. Note that 0 and Ic l <Ic2 and Ic3.

[0097] According to the fourth embodiment of the present invention, the reduction in the operating efficiency of the retractor 1 is determined based on the average value of the current of the motor 14 during the belt winding operation indicating the deterioration state of the retractor 1. Power S can be. Then, the set value of the control parameter can be adjusted by the level according to the degree of decrease in operating efficiency.

The average value may be an average value weighted immediately after the start of the winding operation, in the middle or just before the end. [0098] [Fifth embodiment]

In the first to fourth embodiments, the reduction in operating efficiency is determined from the deterioration information of the retractor 1, and the control parameters are adjusted. However, the control parameter may be adjusted by judging the operation of the retractor 1 from information other than the information on deterioration.

Therefore, as a fifth embodiment of the present invention, a case where control parameters are adjusted based on voltage value information of a power supply will be described.

[0099] When the power supply voltage varies, the rotational speed of the motor 14 also varies. Therefore, ECU 163 in the present embodiment adjusts the winding duty ratio in response to changes in the power supply voltage.

FIG. 12 is a block diagram showing a configuration example of the controller 16 and its connection state in the fifth embodiment of the present invention. In FIG. 12, the same components as those shown in FIG. 3 in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in the figure, the controller 16 in the present embodiment includes a power supply voltage sensor 701 in addition to the components of the controller 16 in the first embodiment.

The power supply voltage sensor 701 is installed on the power supply side of the motor driver 161, and the motor driver 1

The value of the power supply voltage supplied to 61 is detected. The power supply voltage sensor 701 outputs the detected voltage value to the ECU 163.

[0101] In addition, the data storage unit 164 in the present embodiment includes a control parameter adjustment table 7

02 is in the warp.

FIG. 13 is a diagram showing a data structure example of the control parameter adjustment table 702 in the fifth embodiment of the present invention.

As shown in the figure, the control parameter adjustment table 702 stores a set value change condition and a control parameter change method in association with each other.

[0102] ECU 163 reads the set value change condition from control parameter adjustment table 702, and determines whether or not the power supply voltage value input from power supply voltage sensor 701 satisfies the set value change condition. When the power supply voltage value satisfies the set value change condition, the ECU 163 determines the control parameter change method associated with the satisfied set change condition. The motor 14 is controlled based on the control parameters read from the data adjustment table 702 and adjusted by the change method.

[0103] For example, when the power supply voltage value becomes equal to or lower than VI [V], the ECU 163 uses the duty ratio obtained by multiplying the winding duty ratio read from the control parameter setting value table 201 by α, and the motor 143 Control. In addition, when the power supply voltage value becomes V2 [V] or higher, the ECU 163 controls the motor 14 using a duty ratio that is a double of the winding duty ratio read from the control parameter setting value table 201. In addition

, 0 <V1 <V2, a> 1, and β> 1.

[0104] According to the fifth embodiment of the present invention, it is possible to adjust the control parameter setting directly according to the power supply voltage value.

It should be noted that the set value change condition may be further subdivided. From the power supply voltage value

Alternatively, a correction coefficient for changing the control parameter may be obtained by calculation using a mathematical formula.

[Sixth Embodiment]

Further, when the ambient temperature of the retractor 1 changes, the motor efficiency of the motor 14 also changes in proportion to the temperature.

Thus, as a sixth embodiment of the present invention, a case where the control parameter is adjusted based on the atmospheric temperature of the retractor 1 will be described.

[0106] When the motor efficiency varies, the rotational speed of the motor 14 also varies. Therefore, ECU 163 in the present embodiment adjusts the winding duty ratio in accordance with the change in the ambient temperature of retractor 1.

FIG. 14 is a block diagram showing a configuration example of the controller 16 and its connection state in the sixth embodiment of the present invention. In FIG. 14, the same components as those shown in FIG. 3 in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the present embodiment, as shown in the figure, in addition to the components in the first embodiment, a temperature sensor 801 is provided.

The temperature sensor 801 is provided in the vicinity of the retractor 1, for example. Detect ambient temperature. The temperature sensor 801 outputs the detected temperature information to the ECU 163.

In addition, data storage unit 164 in the present embodiment includes control parameter adjustment table 8002.

FIG. 15 is a diagram illustrating a data structure example of the control parameter adjustment table 802 according to the sixth embodiment of the present invention.

As shown in the figure, the control parameter adjustment table 802 stores a set value change condition and a control parameter change method in association with each other.

ECU 163 reads the set value change condition from control parameter adjustment table 802 and determines whether the temperature input from temperature sensor 801 satisfies the set value change condition. When the temperature satisfies the set value change condition, the ECU 163 reads the control parameter change method associated with the satisfied set value change condition from the control parameter adjustment table 802, and based on the control parameter adjusted by the change method. Control the motor 14.

[0110] For example, when the ambient temperature becomes T1 [° C] or lower, the ECU 163 uses a duty ratio obtained by multiplying the winding duty ratio read from the control parameter setting value table 201 by γ. Control motor 14. In addition, when the ambient temperature exceeds T2 [° C], the ECU 163 controls the motor 14 using a duty ratio obtained by multiplying the winding duty ratio read from the control parameter setting value table 201 by 1 / δ. To do. Note that Τ1 <Τ2, γ> 1, and δ> 1.

[0111] According to the sixth embodiment of the present invention, the force S for adjusting the control parameter setting directly according to the ambient temperature can be achieved.

It should be noted that the set value change condition may be further subdivided. Further, a correction coefficient or the like for changing the control parameter may be obtained from the atmospheric temperature by calculation using a mathematical formula.

[0112] Although the embodiments of the present invention have been described above, the present invention can be modified and applied in various forms and is not limited to the above-described embodiments. For example, in the first to fourth embodiments, the set value of the control parameter is The force S is changed from the initial value to 3 levels, and the number of changes is not limited to this. For example, it may be changed to 4 levels or more. Further, for example, a decrease in operating efficiency may be determined based on one set value change condition, and the set value may be changed only once.

[0113] In the first to fourth embodiments, the control parameter setting value table 201 stores the force S in which the change value of the control parameter is stored as it is, the correction coefficient for the initial value, and the like. The set value may be obtained by calculation when the control parameter is used.

[0114] Further, the deterioration information of the retractor 1 may be determined by combining the deterioration information of the first to fourth embodiments. For example, you can change the control parameters when one of the number of operations, usage time, inrush current, or average current during winding operation meets the set value change condition.

[0115] In the first embodiment, the present invention is not limited to the power vehicle in which the seat belt device is provided in the seat of the vehicle, but also in an airplane or the like provided with the seat belt device in the seat. You may apply.

In addition, each process in the flowcharts described in the above embodiments is not limited to the order, and can be performed with a force S to arbitrarily change the order without departing from the gist of the present invention.

In addition, values such as the set value changing condition and the control parameter in the above embodiment are examples, and can be arbitrarily changed without departing from the spirit of the present invention. For example, the value of the set value change condition may be a value that serves as a reference for determining a decrease in the efficiency of the seat belt retracting operation. The set value of the control parameter may be a value that is controlled so that the retractor performs a constant operation regardless of the change level according to the operation efficiency.

Furthermore, in the above embodiment, when the motor control or the like is performed with a force negative value in which the voltage value and the current value are positive values, the absolute value corresponds to the numerical value in the above embodiment. In addition, values such as a set value change condition and a control parameter may be set.

[0117] Further, the ECU 163 in the above embodiment can be realized not only by software but also by dedicated hardware.

The ECU 163 can also be realized by a normal computer system. [0118] For example, in the above embodiment, the description has been given on the assumption that the operation program is stored in advance in the memory or the like in the ECU 163 having the motor control unit and the control parameter adjustment unit. And a program for executing the above-mentioned processing operations, such as a flexible disk, a CD-ROM (Compact Disk Read-Only Memory), a DVD (Digital Versatile Disk), a MO (Magneto-Optical disk), etc. You can configure a device that performs the above processing operations by storing and distributing it in a readable recording medium and installing the program in a computer.

[0119] Further, the program may be stored in a disk device or the like of a predetermined server device on a communication network such as the Internet, and may be superposed on a carrier wave and downloaded to a computer. Furthermore, the above-described processing can also be achieved by starting and executing a program while transferring it via a communication network.

In addition, when the above-mentioned part is realized by an OS (Operating System) sharing or by cooperation between the OS and an application, only the part other than the OS is stored in the medium. It may be distributed or downloaded to a computer.

[0120] This application (to be claimed on the basis of Japanese Patent Application No. 2006-330901, filed December 7, 2006), the disclosure of which is incorporated herein in its entirety.

Industrial applicability

[0121] The present invention is used for a seat belt winding control device that controls the winding of a seat belt, a seat bell rod winding device, a sieve bell rod device, a sieve bell rod winding control method, and a program. be able to.

Claims

The scope of the claims

[1] A motor control value storage unit for storing a motor control value for controlling a motor used for winding the seat belt;

When the operation efficiency determining unit determines that the operation efficiency of the seat belt retractor has decreased, the motor control value stored in the motor control value storage unit is used to determine the operation of the seat belt retractor. A motor control value changing unit to be changed so as to be close to the operation when

A seat belt retractor comprising:

[2] The motor control value stored in the motor control value storage unit is a voltage control value for controlling a voltage value of the motor that determines a winding speed of the seat belt,

The motor control value changing unit is configured to increase the voltage value of the motor when the operation efficiency determination unit determines that the operation efficiency of the sieve reel winding device has decreased. Changing the voltage control value stored in the value storage unit;

The seat belt winding control device according to claim 1, wherein

[3] The motor control value stored in the motor control value storage unit is a hooking force that is a threshold value of a current value of the motor for detecting the hooking of the seat belt during the winding of the seat belt. Current detection threshold,

The motor control value changing unit is configured to store the trap stored in the motor control value storage unit when the operation efficiency determination unit determines that the operation efficiency of the sieve reel winding device has decreased. Increase the applied force and current detection threshold.

The seat belt winding control device according to claim 1, wherein

[4] The motor control value stored in the motor control value storage unit is a restraining current value that is a current value of the motor for determining the tension of the seat belt when restraining an occupant. The motor control value changing unit is configured to store the restraint stored in the motor control value storage unit when the operation efficiency determination unit determines that the operation efficiency of the sieve bell kite winding device has decreased. Increase the current value for

The seat belt winding control device according to claim 1, wherein

[5] The deterioration information acquisition unit acquires the number of operations of the seat belt retractor as deterioration information,

The operation efficiency determination unit determines that the operation efficiency of the seat belt retractor has decreased when the number of operations acquired by the deterioration information acquisition unit exceeds a predetermined number. The seat belt winding control device according to claim 1.

[6] The deterioration information acquisition unit acquires the usage time of the sheet belt take-up device as deterioration information,

The operation efficiency determination unit determines that the operation efficiency of the seat belt retractor has decreased when the usage time acquired by the deterioration information acquisition unit is equal to or longer than a predetermined time.

The seat belt retractor according to claim 1, wherein the seat belt retractor is configured as described above.

[7] The deterioration information acquisition unit acquires a value of the inrush current of the motor as deterioration information, and the operation efficiency determination unit is configured to acquire the seat belt based on the value of the inrush current acquired by the deterioration information acquisition unit. To determine whether the operating efficiency of the winding device has decreased,

The seat belt winding control device according to claim 1, wherein

[8] The deterioration information acquisition unit acquires a current value of the motor during winding of the seat belt as deterioration information,

The operation efficiency determination unit determines whether or not the operation efficiency of the seat belt retractor has been lowered based on the current value acquired by the deterioration information acquisition unit.

The seat belt winding control device according to claim 1, wherein

[9] A supply voltage value acquisition unit that acquires a supply voltage value supplied to the seat belt retractor;

A supply voltage value determination unit for determining whether or not the supply voltage value acquired by the supply voltage value acquisition unit is smaller than a predetermined voltage value; The voltage control value stored in the motor control value storage unit is changed so as to increase the voltage value of the motor when the supply voltage value determination unit determines that the supply voltage value is smaller than a predetermined voltage value. A voltage control value changing unit that further includes:

The seat belt winding control device according to claim 2, wherein the seat belt winding control device is provided.

[10] An ambient temperature acquisition unit that acquires an ambient temperature of the sheet belt winding device; a temperature determination unit that determines whether the ambient temperature acquired by the ambient temperature acquisition unit is higher than a predetermined temperature;

Voltage control value change that changes the voltage control value stored in the motor control value storage unit so as to decrease the voltage value of the motor when the temperature determination unit determines that the ambient temperature is higher than a predetermined temperature. And further comprising:

[11] a motor;

A winding mechanism that winds up the seat belt using the rotation of the motor; a motor control value storage that stores a motor control value for controlling the motor; and deterioration information of the winding mechanism A deterioration information acquisition unit;

Based on the deterioration information acquired by the deterioration information acquisition unit, an operation efficiency determination unit for determining whether or not the efficiency of the seat belt winding operation has decreased, and

When the operation efficiency determination unit determines that the efficiency of the seat belt winding operation has decreased, the motor control value stored in the motor control value storage unit is used as the efficiency for winding the seat belt. A motor control value changing unit that changes so that it approaches the operation when the

A seat belt retractor comprising:

[12] a fixing member for fixing one end of the seat belt;

A knock nose that is disposed on the side facing the fixing member across the sheet and engages with the engaging member; A guide member disposed above the fixing member, through which the seat belt is passed, and for slidably supporting the seat belt;

With

The seat belt winding control device includes:

When the operation efficiency determining unit determines that the operation efficiency of the seat belt retractor has decreased, the motor control value stored in the motor control value storage unit is used as the operation of the seat belt retractor. The motor control value changing means part to be changed so that the operating efficiency is reduced! / ,!

A seat belt device comprising:

[13] A deterioration information acquisition step for acquiring deterioration information of a seat belt retractor including a motor used for winding the seat belt;

A seat belt winding control method comprising:

[14] On the computer,

Deterioration of seat belt retractor with motor used for seat belt retractor Deterioration information acquisition step for acquiring information,

A program for running