JP5538051B2 - Vehicle seat belt device - Google Patents

Description

  The present invention relates to a vehicle seat belt device.

  Conventionally, for example, with respect to a motor that rotates and drives a belt reel on which a seat belt webbing is wound, a seat belt device that changes the normal output range of the motor to a higher output side as the temperature of the passenger compartment decreases is known. (For example, refer to Patent Document 1).

JP 2008-24134 A

By the way, in the seat belt device according to the above prior art, when the temperature sensor for detecting the temperature of the passenger compartment is abnormal, the normal range of the motor output may be changed inappropriately, and the belt reel rotation drive by the motor It is desired to prevent the occupant from feeling uncomfortable with the winding operation of the webbing by the belt reel.
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is suitable for a vehicle capable of optimizing belt reel rotation driving by a motor and preventing the winding operation of the webbing by the belt reel from causing the passenger to feel uncomfortable. An object is to provide a seat belt device.

In order to solve the above problems and achieve the object, a vehicle seat belt device according to a first aspect of the present invention includes a tongue plate (for example, an embodiment) of a seat belt (for example, the webbing 5 in the embodiment). A buckle switch (for example, a buckle switch (buckle SW) 62 in the embodiment) that outputs a signal indicating whether the tongue plate 8) in the form is attached or not attached to the buckle (eg, the buckle 9 in the embodiment) And a motor (for example, the motor 10 in the embodiment) that rotationally drives the belt reel by transmitting a driving force to a belt reel (for example, the belt reel 14 in the embodiment) around which the seat belt is wound. ) And temperature detection means (atmosphere temperature sensor 64, motor mode) for detecting the ambient temperature of the vehicle or the temperature of the motor and outputting a detection result signal. When a signal indicating the non-wearing state is output from the temperature sensor 65) and the buckle switch, a current is supplied to the motor to execute the seat belt winding operation, and the temperature detection means outputs the the temperature of the detection result to set the current in the case of the first temperature equal to or more than a predetermined threshold temperature to the first current, a second temperature lower than the detected temperature result the threshold temperature output from said temperature detecting means Is set to a second current larger than the first current , and when the winding operation is performed, the belt reel is rotated at the first speed when the winding amount is less than a predetermined winding amount. Control means for driving and rotating the belt reel at a second speed slower than the first speed when the winding amount is equal to or greater than the predetermined winding amount (for example, the processing device 46 in the embodiment) ) Wherein the first current corresponds to the first temperature and the first speed, the second current is set corresponding to the second temperature and the first speed, the first temperature and the The fourth current corresponding to the second speed is set smaller than the first current and the second current, and the fifth current corresponding to the second temperature and the second speed is greater than the first current. And the control means sets the third current to be smaller than the second current and larger than the fifth current when the temperature detecting means is abnormal. The motor is rotationally driven with the current value .

  According to the vehicle seat belt device of the first aspect of the present invention, when the temperature detecting means is abnormal, the current supplied to the motor is larger than the first current at the first temperature and the second at the second temperature. By setting the third current smaller than the current, it is possible to prevent the feeling of touch of the seat belt from becoming too strong when the actual temperature is equal to or higher than the predetermined threshold temperature, and the actual temperature is the predetermined threshold temperature. When it is less than this, it is possible to prevent the seat belt from being poorly wound.

Furthermore , even when the temperature detecting means is abnormal, the current supplied to the motor can be set appropriately and in detail according to the amount of seat belt retracted.

1 is a configuration diagram of a vehicle seat belt device according to an embodiment of the present invention. It is a block diagram of the processing apparatus of the vehicle seatbelt apparatus which concerns on embodiment of this invention. It is a block diagram of the atmospheric temperature sensor which concerns on embodiment of this invention. It is a figure which shows the example of the data which show the corresponding | compatible relationship between the partial pressure ratio (divided voltage) of the thermistor and series resistance of the atmospheric temperature sensor which concerns on embodiment of this invention, and atmospheric temperature. It is a flowchart which shows operation | movement of the vehicle seatbelt apparatus which concerns on embodiment of this invention.

Hereinafter, an embodiment of a vehicle seat belt device of the present invention will be described with reference to the accompanying drawings.
A vehicle seat belt device 1 according to this embodiment is a so-called three-point seat belt device capable of restraining an occupant 3 seated on a seat 2 as shown in FIG. 1, for example, and is attached to a center pillar (not shown). The webbing 5 is pulled out substantially upward in the vertical direction from the retractor 4, and the webbing 5 is inserted into the through anchor 6 supported on the upper side of the center pillar, and the front end of the webbing 5 is located closer to the outside of the seat 2. It is fixed to the vehicle body floor via the outer anchor 7. A tongue plate 8 is inserted between the through anchor 6 and the outer anchor 7 of the webbing 5, and the tongue plate 8 is attached to and detached from the buckle 9 fixed to the vehicle body floor of the seat 2 on the inner side of the vehicle body. It is possible.

The webbing 5 is wound around the retractor 4 in an initial state (for example, an unmounted state), and is pulled out from the belt reel 14 by the occupant 3, and the tongue plate 8 is mounted and fixed to the buckle 9. The body (for example, chest and waist) is restrained with respect to the seat 2.
In the vehicle seat belt device 1, the webbing 5 is wound up by the driving force of the motor 10 that applies a rotational force to the belt reel 14 in an emergency or when the vehicle behavior changes.

  In the retractor 4, for example, as shown in FIG. 2, the belt reel 14 around which the webbing 5 is wound is rotatably supported by a retractor frame (not shown), and the shaft 14a of the belt reel 14 is externally connected from one end side of the retractor frame. Protrusively toward. The shaft 14a of the belt reel 14 is connected to the rotating shaft 10a of the motor 10 via a power transmission mechanism 18 having a power connection / disconnection clutch and gear mechanism (not shown).

The clutch in the power transmission mechanism 18 can disconnect the connection between the motor 10 and the belt reel 14 in accordance with the rotation state of the motor 10. The retractor 4 is provided with a take-up spring (not shown) for urging the belt reel 14 in the take-up direction of the webbing 5, and the tension by the take-up spring in a state where the belt reel 14 and the motor 10 are separated by the clutch. Acts on the webbing 5. Note that the clutch is switched between a connected state and a disconnected state corresponding to the rotation in the forward rotation direction (winding direction of the webbing 5) of the motor 10 and the rotation in the reverse rotation direction (drawing direction of the webbing 5). It has become so.
The retractor 4 includes an emergency lock mechanism 20 that mechanically locks the webbing 5 when a deceleration exceeding a predetermined value is applied to the vehicle, for example.

  The retractor 4 is provided with a rotation sensor 24 that detects the rotational position of the belt reel 14. The rotation sensor 24 is, for example, magnetized so that different magnetic poles appear alternately along the circumferential direction, and the magnetic rotor 21 that rotates integrally with the belt reel 14 and the outer peripheral edge of the magnetic rotor 21 are non-rotated. A pair of Hall elements 23A and 23B arranged close to each other in a contact state and a sensor circuit 45 for processing detection signals of the pair of Hall elements 23A and 23B are provided.

  The pulse signal input from the sensor circuit 45 to the processing unit (ECU) 46 according to the rotation of the belt reel 14 is used to detect the rotation amount, rotation speed, rotation direction, and the like of the belt reel 14. That is, the processing unit (ECU) 46 detects the rotation amount of the belt reel 14 (that is, the pulling amount of the webbing 5) by counting the pulse signal, and calculates the change speed (frequency) of the pulse signal by calculating the belt signal. The rotation speed of the reel 14 (that is, the winding speed or the drawing speed of the webbing 5) is calculated, and the rotation direction of the belt reel 14 is detected by comparing the rising edges of the waveforms of both pulse signals.

The processing device 46 configured by an electronic circuit such as a CPU (Central Processing Unit) is configured to include, for example, a winding position calculation unit 51, a control target setting unit 52, and a motor control unit 53.
Then, the processing device 46 detects, for example, an ignition switch 61 that detects whether the ignition is on or off and outputs a detection result signal, and detects whether the tongue plate 8 is attached or not attached to the buckle 9 and detects the detection result signal. A buckle switch (buckle SW) 62 that outputs a signal, a door switch (door SW) 63 that detects the opening or closing of the vehicle door and outputs a detection result signal, and a detection result signal by detecting the ambient temperature of the vehicle An ambient temperature sensor 64 that outputs a temperature, a motor temperature sensor 65 that detects the temperature of the motor 10 and outputs a detection result signal, and a current sensor that detects a current passed through the motor 10 and outputs a detection result signal 66, and detection of driving state quantities such as vehicle acceleration, deceleration, speed, yaw rate, etc., and outputs detection result signals. Such a state quantity sensor 67 is connected.

For example, as shown in FIG. 3, the ambient temperature sensor 64 includes a thermistor 64a and a series resistor 64b connected in series to the thermistor 64a.
For example, as shown in FIG. 4, the processing device 46 stores in advance data indicating the correspondence between the voltage division ratio (voltage division) between the thermistor 64 a and the series resistor 64 b and the ambient temperature, and based on this data. To detect the ambient temperature. For the voltage division ratio (voltage division voltage) between the thermistor 64a and the series resistor 64b, a predetermined lower threshold Lth for determining an open failure of the thermistor 64a and a predetermined for determining a short failure of the thermistor 64a. The upper limit threshold value Hth is set.

The winding position calculation unit 51 calculates the rotational position of the belt reel 14 from each pulse signal output from the pair of Hall elements 23A and 23B, and outputs this rotational position as the winding position.
The control target setting unit 52 sets a control target when the motor 10 is energized, for example, according to the winding position output from the winding position calculation unit 51.
The motor control unit 53 controls the energization of the motor 10 by setting a target current and a target speed when driving the motor 10 according to the control target set by the control target setting unit 52.

  Then, when a signal indicating non-wearing is output from the buckle switch (buckle SW) 62, the processing device 46 energizes the motor 10 to execute the winding operation of the webbing 5, and the ambient temperature or the motor 10 The current is set to the first current when the temperature detection result is the first temperature equal to or higher than the predetermined threshold temperature, and the current is set when the detection result of the ambient temperature or the temperature of the motor 10 is the second temperature lower than the threshold temperature. Is set to a second current larger than the first current.

Then, when the atmosphere temperature sensor 64 or the motor temperature sensor 65 is abnormal, the processing device 46 sets the current to be supplied to the motor 10 to a third current that is larger than the first current and smaller than the second current.
The determination as to whether or not each of the temperature sensors 64 and 65 is abnormal is, for example, whether or not the temperature detection result has deviated from a predetermined temperature range (for example, a temperature range that is not less than the lower threshold Lth and not more than the upper threshold Hth). This is done based on the judgment.

Further, when the winding amount of the webbing 5 is less than the predetermined winding amount, the processing device 46 drives the belt reel 14 to rotate at the first speed so that the winding amount reaches the predetermined winding amount. If it is greater than the amount, the belt reel 14 is rotationally driven at a second speed that is slower than the first speed.
Then, the processing device 46 sets the current supplied to the motor 10 as the first current for the first temperature and the first speed, the second current for the second temperature and the first speed, and the first temperature and the first speed. 4th current for 2 speeds, 5th current for 2nd temperature and 2nd speed, 4th current smaller than 1st current and 2nd current, 5th current larger than 1st current The third current is set to be smaller than the second current, and the third current is set to be smaller than the second current and larger than the fifth current.

When the belt reel 14 is rotationally driven at the first speed or the second speed, the ambient temperature or the temperature of the motor 10 is decreased from the first temperature to the second temperature (for example, from normal temperature to a low temperature). Accordingly, even when the friction with respect to the rotational drive of the belt reel 14 increases due to the temperature decrease and hardening of the webbing 5, the current supplied to the motor 10 is increased from the first current to the second current, or By increasing the current to be supplied to the motor 10 from the fourth current to the fifth current, it is possible to prevent the winding failure of the webbing 5 from occurring.
In addition, as the winding amount increases from less than the predetermined winding amount to more than the predetermined winding amount, the rotational speed of the belt reel 14 is decreased from the first speed to the second speed, so that the feel of the webbing 5 is felt. Can be prevented from becoming too strong, and the winding operation of the webbing 5 can be completed gently.

  The vehicle seat belt device 1 according to this embodiment has the above-described configuration. Next, the operation of the vehicle seat belt device 1 will be described.

First, for example, in step S01 shown in FIG. 5, it is determined whether or not a signal indicating non-wearing is output from the buckle switch (buckle SW) 62.
If this determination is “NO”, the flow proceeds to return.
On the other hand, if this determination is “YES”, the flow proceeds to step S 02.

In step S02, it is determined whether each temperature sensor 64, 65 is abnormal.
If this determination is “YES”, the flow proceeds to step S 03, and in this step S 03, the current supplied to the motor 10 is set as the third current, and the flow proceeds to return.
On the other hand, if this determination is “NO”, the flow proceeds to step S 04.

In step S04, it is determined whether the detection result of the ambient temperature or the temperature of the motor 10 is equal to or higher than a predetermined threshold temperature.
If this determination is “NO”, the flow proceeds to step S 11 described later.
On the other hand, if this determination is “YES”, the flow proceeds to step S 05.
In step S05, the detection result of the ambient temperature or the temperature of the motor 10 is set as the first temperature.

In step S06, it is determined whether the winding amount of the webbing 5 is less than a predetermined winding amount.
If this determination is “NO”, the flow proceeds to step S 09 described later.
On the other hand, if this determination is “YES”, the flow proceeds to step S07.
In step S07, the rotational speed of the belt reel 14 that is rotationally driven by the motor 10 is set to the first speed.
In step S08, the current supplied to the motor 10 is set as the first current, and the process proceeds to return.

In step S09, the rotational speed of the belt reel 14 that is rotationally driven by the motor 10 is set to the second speed.
In step S10, the current supplied to the motor 10 is set as the fourth current, and the process proceeds to return.

In step S11, the detection result of the ambient temperature or the temperature of the motor 10 is set as the second temperature.
In step S12, it is determined whether or not the winding amount of the webbing 5 is less than a predetermined winding amount.
If this determination is “NO”, the flow proceeds to step S 15 described later.
On the other hand, if the determination is “YES”, the flow proceeds to step S13.
In step S13, the rotational speed of the belt reel 14 that is rotationally driven by the motor 10 is set to the first speed.
In step S14, the current supplied to the motor 10 is set as the second current, and the process proceeds to return.

In step S15, the rotational speed of the belt reel 14 that is rotationally driven by the motor 10 is set to the second speed.
In step S16, the current supplied to the motor 10 is set as the fifth current, and the process proceeds to return.

As described above, according to the vehicle seat belt device 1 according to the embodiment of the present invention, when the temperature sensors 64 and 65 are abnormal, the current supplied to the motor 10 is larger than the first current at the first temperature. Setting the third current smaller than the second current at the second temperature to prevent the webbing 5 from feeling too strong when the actual temperature is equal to or higher than the predetermined threshold temperature; and It is possible to prevent the winding failure of the webbing 5 from occurring when the actual temperature is lower than a predetermined threshold temperature.
Furthermore, even when the temperature sensors 64 and 65 are abnormal, the current supplied to the motor 10 can be set appropriately and in detail according to the winding amount of the webbing 5.

1 Vehicle seat belt device 5 Webbing (seat belt)
8 Tongue plate 9 Buckle 10 Motor 46 Processing device (control means)

Claims (1)

A buckle switch that outputs a signal indicating whether the seat belt tongue plate is attached or not attached to the buckle;
A motor that rotationally drives the belt reel by transmitting a driving force to a belt reel around which the seat belt is wound;
Temperature detection means for detecting the ambient temperature of the vehicle or the temperature of the motor and outputting a detection result signal;
When a signal indicating the non-wearing is output from the buckle switch, a current is passed through the motor to perform the seat belt winding operation,
The temperature of the detection result output from the temperature detecting means sets the current when a predetermined threshold temperature or more first temperature to the first current, wherein the detection result temperature output from said temperature detecting means There when a second temperature below the threshold temperature is set to the second current greater than the first current, during execution of the winding operation, when the winding amount is less than the predetermined winding amount Control means for rotationally driving the belt reel at a first speed and rotating the belt reel at a second speed slower than the first speed when the winding amount is equal to or greater than the predetermined winding amount ; Prepared,
The first current corresponds to the first temperature and the first speed, and the second current is set to correspond to the second temperature and the first speed,
The fourth current corresponding to the first temperature and the second speed is set smaller than the first current and the second current,
The fifth current corresponding to the second temperature and the second speed is set larger than the first current and smaller than the second current,
The control means rotates the motor at a current value set such that the third current is smaller than the second current and larger than the fifth current when the temperature detecting means is abnormal. Vehicle seat belt device.

Images