JP5850867B2 - Seat belt device with heater - Google Patents

Description

  The present invention relates to a seat belt device with a heater that not only restrains an occupant to a seat but also has a heating function.

  Almost all current passenger cars have a seat belt device in the seat. The seat belt device is a safety device that restrains the occupant to the seat with belt-shaped webbing, and prevents the occupant from jumping forward due to inertial force when a large deceleration is applied to the vehicle due to a sudden stop or collision. Yes. In general, the three-point seat belt device, which is widely spread, inserts a tongue plate provided on the webbing into the buckle next to the seat, so that the area from the shoulder of the occupant to the waist and the area from both sides of the waist It becomes the structure which restrains.

  In recent years, a type of seat belt device that has various additional functions such as a heater function for warming an occupant has been developed in addition to an occupant restraint function. For example, in the seat belt device of Patent Document 1, a portion that generates heat called a temperature adjustment unit is provided in the webbing. The temperature control unit is embedded with a heating member such as a heating wire, and functions as heating or the like, thereby enhancing the comfort of the passenger.

JP 2008-37326 A

  Currently, there is a demand for the development of a seat belt device with a higher function, such as a type capable of automatically controlling the heat generation temperature. When aiming to further improve comfort in such a type, the seat belt device with a heater is provided with a heater function in the webbing that directly contacts the occupant's body, so that even a slight temperature error causes discomfort to the occupant. There is a risk, and more accurate feedback operation is required.

  In view of such problems, an object of the present invention is to provide a seat belt device with a heater having high comfort and capable of temperature control by a highly accurate feedback operation.

  In order to solve the above problems, a representative configuration of a seatbelt device with a heater according to the present invention includes a webbing that restrains an occupant including a waist belt that covers both sides of the occupant's waist, and a seat shape. A sheet heater that is attached along the occupant side of the waist belt and generates heat by electricity, a temperature detection element that is mounted on the occupant side of the sheet heater and detects the temperature of the sheet heater, and the temperature of the sheet heater And a control unit for controlling the power supplied to the planar heater according to the actual measurement value.

  Since the webbing provided with the planar heater is in close contact with the occupant, the sensible temperature of the occupant tends to be high, and even if a slight error occurs in the temperature control, there is a fear that it will be felt hot. Therefore, in the above-described configuration, the temperature detection element is arranged at the position on the passenger side of the planar heater, thereby performing temperature measurement more in line with the passenger's sensible temperature. And by using the actual measurement value obtained from it for feedback operation, temperature control with high accuracy is made possible and the improvement of comfort is achieved.

  The seat belt device with a heater may further include an insulating protective member that covers the planar heater between the temperature detection element and the planar heater. According to this insulating protection member, the planar heater does not directly touch the occupant's body and the touch is improved, so that the usability is enhanced.

  Said temperature detection element is good to be arrange | positioned in the area | region where a passenger | crew's body temperature is transmitted at least among planar heaters. Moreover, the area | region where a passenger | crew's body temperature is transmitted may be an area | region from the side of a passenger | crew's pelvis to a buttocks part among planar heaters. According to these configurations, by taking into account the body temperature transmitted from the occupant, it is possible to control the temperature according to the sensation temperature felt by the occupant.

  The control unit sets a target temperature for generating heat of the planar heater as a first set value that is at least a temperature that causes a high-temperature burn to the occupant and a temperature that is equal to or lower than the first set value and causes a low-temperature burn to the occupant. The control unit further supplies power to the planar heater so that the actual measured value reaches the first set value, and then the supplied power is set so that the actual measured value approaches the second set value. It is good to control. According to this configuration, it is possible to provide a seatbelt device with a heater that rises quickly and takes safety into consideration.

  The control unit supplies maximum electric power that can be supplied to the planar heater until the measured value reaches the first set value, and stops the supplied power when the measured value is directed to the second set value. An OFF operation to be performed or a proportional operation to supply power proportional to the deviation of the actually measured value with respect to the second set value may be performed. According to this configuration, the temperature can be controlled with higher accuracy and higher accuracy.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the seatbelt apparatus with a heater with high comfort which can control temperature by highly accurate feedback operation.

It is the figure which illustrated the outline | summary of the seatbelt apparatus with a heater concerning this invention. FIG. 2 is an exploded view of the heater assay of FIG. 1. It is the figure which looked at the seatbelt apparatus with a heater of FIG. 1 from the vehicle outer side of the vehicle width direction. It is the figure which illustrated schematically the further structure of the said seatbelt apparatus with a heater. It is the figure which illustrated the control operation by the control part of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram illustrating an outline of a seat belt device with a heater according to the present invention. FIG. 1 illustrates the right front seat of the vehicle as viewed from the front right side of the vehicle. The seat belt device with a heater (hereinafter referred to as a heater belt 100) is a three-point type that is widely used as a general seat belt for a driver's seat, and is a through anchor provided on a wall portion in a vehicle interior. 102, the tongue plate 106 connected to the buckle 104 beside the seat, and the buckle 104 are supported at three points of the anchor plate 108 on the opposite side across the seat to restrain the occupant 110.

  It is a belt-like webbing 112 that directly restrains the occupant 110. The webbing 112 has a shoulder belt 112a extending from the shoulder to the waist of the occupant 110 with the tongue plate 106 as a boundary, and both sides on the waist. The waist belt 112b is divided into contact with the occupant 110 and restrained. The webbing 112 is wound around and retracted by a retractor 114 installed at the base side below the through anchor 102.

  The heater belt 100 has a heating function in addition to the original function as a safety device for restraining the occupant 110. In the present embodiment, a heater assay 120 is provided on the waist belt 112b. The heater assay 120 is composed of members centering on a planar heater 122 (see FIG. 2) as a heater that generates heat by electricity.

  FIG. 2 is an exploded view of the heater assay 120 of FIG. First, the planar heater 122 has a long sheet shape, is thin and flexible, and is attached along the occupant side surface (the lower surface in FIG. 2) of the waist belt 112 b of the webbing 112. Two electrode wires 118a and 118b are connected to the planar heater 122, and receive electric power and predetermined control from a control unit 128 (see FIG. 4) on the vehicle side. The planar heater 122 may be a planar structure having exothermic properties. For example, a so-called carbon heater using a resistance heating element or carbon fiber, or an aluminum foil heater may be used.

  An insulating protection member 124 is provided on the passenger side of the planar heater 122 so that the planar heater 122 does not directly touch the body of the passenger 110. The insulating protection member 124 is a cover member made of an insulating fiber material or foam material, and is installed on the webbing 112 by sewing, bonding, or welding. By providing the insulating protective member 124, the safety is improved and the touch of the webbing 112 is improved, so that the usability of the heater belt 100 is enhanced.

  In the present embodiment, the temperature of the heater assay 120 is measured, and the temperature is automatically controlled by feeding it back to the control operation. Therefore, the heater assay 120 is provided with a temperature detection element 126 in order to detect the heat generation temperature of the planar heater 122. The temperature detection element 126 is a temperature sensor typified by a thermistor, has a thin structure, and is attached to the occupant side of the insulating protection member 124 that covers the planar heater 122.

  FIG. 3 is a view of the heater-equipped seat belt device of FIG. 1 as viewed from the vehicle outer side in the vehicle width direction. Since the webbing 112 is in close contact with the occupant 110, the sensible temperature of the occupant 110 tends to increase. Therefore, in the present embodiment, the temperature detection element 126 is provided in a region where at least the body temperature of the occupant 110 is transmitted within the range of the planar heater 122. This is a configuration for more accurately managing the temperature of the planar heater 122 in consideration of the body temperature transmitted from the occupant 110.

  The detailed arrangement location of the temperature detection element 126 in the present embodiment is in an area E1 extending from the side of the pelvis of the occupant 110 to the buttocks. As a result, the temperature detection element 126 can detect the temperature of the planar heater 122 and the surface temperature of the heater belt 100 in consideration of the body temperature of the occupant 110. With this configuration, it becomes possible to measure the temperature more in accordance with the sensible temperature of the occupant 110.

  The surface temperature of the heater belt 100 detected by the above configuration is fed back to the temperature control of the planar heater 122 by the control unit 128 described below. FIG. 4 is a diagram schematically illustrating a further configuration of the seat belt device with a heater. As illustrated in FIG. 4, the heater belt 100 includes a control unit 128 including a CPU 130 and a switching element 132, and the control unit 128 controls power supplied to the planar heater 122.

  The CPU 130 transmits an operation signal to the switching element 132 according to the actually measured value of the surface temperature of the heater belt 100 obtained from the temperature detection element 126. In response to this operation signal, the switching element 132 controls the amount of power supplied from the battery 134 to the planar heater 122 by an ON / OFF operation or a proportional operation.

  In the heater belt 100, the temperature of the planar heater 122 is controlled in consideration of the safety of the occupant 110. In particular, the control operation by the control unit 128 is provided with measures against burns (burns). FIG. 5 is a diagram illustrating a control operation by the control unit 128 of FIG. 4, and FIG. 5A illustrates a temperature change (measured value) of the planar heater 122 with respect to time. As shown in FIG. 5A, in this embodiment, temperature control is performed by providing a first set value L1 and a second set value L2 as target temperatures for heat generation of the planar heater 122.

  First, the first set value L1 is set to be equal to or lower than a temperature causing at least high temperature burns to the occupant 110. A high-temperature burn is a burn at a temperature that occurs instantaneously when touched by a human being, and is generally a symptom that occurs at a temperature of approximately 60 ° C. or higher.

  Next, the second set value L2 is set to be equal to or lower than the first set value L1, and at least equal to or lower than a temperature that causes low temperature burns to the occupant 110. A low temperature burn is a symptom that occurs at a relatively low temperature when a human touches it, but does not cause a burn instantly, but a burn occurs when touched for a long time. Generally, it is said that there is a risk of onset if the temperature is approximately 41 ° C. or higher.

  The heater belt 100 performs temperature control by providing the first set value L1 and the second set value L2. FIG. 5B is an example of control of power supplied to the planar heater 122 of FIG. As illustrated in FIG. 5B, when the heater assay 120 is activated, the control unit 128 first reaches the first set value L1 so that the measured value (FIG. 5A) reaches the first set value L1 so as to quickly start the heater function. Until then, supply the maximum power that can be supplied.

  Next, after the actually measured value reaches the first set value L1, the supplied power is controlled so that the actually measured value is directed to the second set value L2 in order to prevent low temperature burns. The control for directing the actual measurement value to the second set value L2 is enabled by a proportional operation that controls the supplied power in proportion to the deviation of the actual measurement value from the second set value L2. In order to align the measured value with the second set value L2 with high accuracy, a PID operation in which a proportional operation is combined with an integration operation or a differentiation operation can be used.

  In this way, the heater belt 100 accelerates the rise of the heater function and considers prevention of low-temperature burns, so that comfortable and safe temperature control is possible. In particular, the feedback control uses an actual measurement value of the surface temperature of the portion of the heater assay that is in contact with the occupant 110, so that the comfort of the occupant can be further enhanced. Note that the temperature control described with reference to FIG. 5B can also be performed by an ON / OFF operation. FIG. 5C is another example of the control of the supplied power illustrated in FIG. As illustrated in FIG. 5C, the temperature control can be performed by changing the ON / OFF ratio in proportion to the deviation of the actually measured value with respect to the second set value L2.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the embodiments described above are preferred examples of the present invention, and other embodiments can be implemented by various methods. Can be carried out. The invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise specified in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

  Therefore, it is obvious for those skilled in the art that various changes and modifications can be conceived within the scope of the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a seat belt device with a heater that not only restrains an occupant to a seat but also has a heating function.

E1 ... Area from the pelvis to the buttocks, L1 ... First set value, L2 ... Second set value, 100 ... Heater belt, 102 ... Through anchor, 104 ... Buckle, 106 ... Tang plate, 108 ... Anchor plate, 110 ... Crew 112 ... Webbing, 112a ... Shoulder belt, 112b ... Waist belt, 114 ... Retractor, 118a, 118b ... Electrode wire, 120 ... Heater assay, 122 ... Planar heater, 124 ... Insulating protective member, 126 ... Temperature sensing element, 128: Control unit, 130: CPU, 132: Switching element, 134: Battery

Claims (4)

A webbing that restrains the occupant by including a waist belt covering both sides of the occupant's waist;
A sheet heater that is attached along the occupant side surface of the waist belt and generates heat by electricity; and
A temperature detecting element that is attached to a region extending from the side of the pelvis of the occupant to the buttocks of the occupant side of the planar heater, and detects the temperature of the planar heater;
A control unit for controlling the power supplied to the planar heater according to the measured value of the temperature of the planar heater;
A seatbelt device with a heater. The seatbelt device with a heater according to claim 1, further comprising an insulating protection member that covers the planar heater between the temperature detection element and the planar heater. The control unit sets, as a target temperature for heat generation of the planar heater, a first set value that is at least a temperature that causes a high-temperature burn to the occupant, and a low-temperature burn that is not more than the first set value and is at least the first set value. A second setpoint below the temperature to be generated,
The controller further supplies power to the planar heater so that the measured value reaches the first set value, and then controls the supplied power so that the measured value is directed to the second set value. The seat belt device with a heater according to claim 1 or 2 , wherein the seat belt device has a heater. The control unit supplies maximum electric power that can be supplied to the planar heater until the measured value reaches the first set value, and when the measured value is directed to the second set value, 4. The seat belt device with a heater according to claim 3 , wherein an OFF operation for stopping supply power or a proportional operation for supplying electric power proportional to a deviation of the actual measurement value with respect to the second set value is performed.

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