Search

JP-7857175-B2 - seat

JP7857175B2JP 7857175 B2JP7857175 B2JP 7857175B2JP-7857175-B2

Inventors

  • 澤田 直巳知

Assignees

  • 株式会社SUBARU

Dates

Publication Date
20260512
Application Date
20220630

Claims (5)

  1. A seat having a seat surface on which the occupant's waist and thighs rest when operating the steering of the vehicle, and a seat back that contacts the occupant's back, An elastic body disposed in the seat back portion, The frame of the seat back portion comprises a pair of side members arranged along the left and right side edges of the seat back portion, A beam-shaped member is provided between the pair of side members, behind the elastic body and within a predetermined height range along the surface of the seat back portion from the seat surface portion, and is a hard member having a higher hardness than the elastic body, An actuator comprising an electric motor, which transmits the power generated by the electric motor to the rigid member, thereby moving the rigid member in the front-rear direction relative to the pair of side members, A lateral acceleration estimation unit calculates the lateral acceleration generated in the vehicle when traveling in a lane located a predetermined distance ahead of the vehicle, based on information indicating the vehicle speed input from the vehicle's speed sensor and information indicating the shape of the lane ahead of the vehicle input from at least one of the vehicle's navigation system and an environment recognition unit that recognizes the surrounding environment of the vehicle. A steering operation prediction unit predicts whether or not the steering operation will be performed based on the lateral acceleration , A seat characterized by comprising: a rigidity change control unit that controls the actuator to position the rigid member from a first position to a second position forward of the first position when the steering operation is expected to occur, and controls the actuator to position the rigid member to a first position when the steering operation is not expected to occur .
  2. The steering operation prediction unit determines the predetermined distance such that the predetermined distance increases as the vehicle speed increases. The sheet according to claim 1, characterized in that
  3. The steering operation prediction unit determines the predetermined distance based on a value obtained by multiplying the time required for the actuator to move the rigid member from the first position to the second position by the vehicle speed. The sheet according to claim 2 , characterized in that
  4. The seat according to any one of claims 1 to 3, characterized in that the steering operation prediction unit predicts that the steering operation will be performed when the lateral acceleration is greater than or equal to a predetermined value, predicts that the steering operation will not be performed when the lateral acceleration is less than a predetermined value, and predicts that the steering operation will be performed regardless of the value of the lateral acceleration when the vehicle's turn signal operation is detected .
  5. The sheet according to any one of claims 1 to 3, characterized in that the stiffness change control unit moves the second position further forward as the lateral acceleration increases.

Description

This invention relates to a seat, for example, that is mounted in a vehicle or the like and in which an occupant sits. As a technology relating to the control of vehicle seats, for example, Patent Document 1 describes controlling the shoulder support portion that supports the upper arm from the side, the armrest, and the seat tilt portion based on the occupant's seating state, such as the weight of the occupant seated on the seat, the occupant's gripping force detected by the grip sensor, and the occupant's load detected by the armrest sensor, as well as the lateral acceleration predicted based on the curvature of the road on which the vehicle is traveling and the vehicle speed, in order to properly maintain the occupant's posture. Patent Document 2 describes a steering support device that, in order to improve steering performance in a cramped posture with the upper body close to the steering wheel, has a seat back displacement means that can independently displace at least the left and right upper shoulder portions of the support surface that supports the driver toward the rear of the vehicle, and performs steering support control that displaces at least the shoulder portion on the steering direction side of the support surface toward the rear of the vehicle. Patent Document 3 describes an occupant posture adjustment device that measures the occupant's body pressure value and adjusts how the pelvis and scapula are supported so that the body pressure value becomes appropriate for that person. The device includes a bottom support member pivotally supported by the seat cushion directly below the hip point and supporting the thighs from below, a lower support member pivotally supported by the seat back at a lower position below the seat back and supporting the pelvis from behind, an upper support member pivotally supported by the seat back at an upper position above the seat back and supporting the scapula from behind, and a control device that controls the drive devices that drive each support member. Patent Document 4 describes a vehicle seat having a seat cushion and a seat back, which, in order to match the forward view perceived by the occupant with the physical driving state of the vehicle and improve steering operability during turns, controls the rigidity value of the seat surface on the outer part in the turning direction of the seat cushion to be higher than the rigidity value of the seat surface on the inner part in the turning direction when a turning driving state is detected by a steering angle sensor. Japanese Patent Publication No. 2019-209733Japanese Patent Publication No. 2007-331650Japanese Patent Publication No. 2019-137286Japanese Patent Publication No. 2020-50255 This is a schematic side view of an embodiment of a sheet to which the present invention is applied.This is a view from the line II-II in Figure 1.This is a schematic diagram showing the seat back frame of the seat in the embodiment as viewed from the front of the vehicle.This is a schematic diagram of the view from the arrow IV-IV in Figure 3.This figure shows the configuration of the system for controlling the actuator in the seat of the embodiment.This is a flowchart showing the control of the actuator in the seat of the embodiment. The following describes embodiments of a sheet to which the present invention is applied. The seat of this embodiment is used, for example, as a front seat (driver's seat) for an automobile such as a passenger car, in which an occupant 100 (driver) sits. Figure 1 is a schematic side view of the sheet according to the embodiment. Figure 2 is a view taken along the line II-II in Figure 1. Note that the crew member 100 is omitted from the illustration in Figure 2. The seat 1 of this embodiment is configured to include a seat surface 10, a seat back 20, a headrest 30, and the like. The seat cushion 10 is the part on which the occupant 100's waist 110 and thighs 120 rest. The seat back (backrest) 20 is a backrest-like portion positioned along the back 131 of the upper body 130 of the occupant 100. The seat back 20 is formed extending upward from near the rear end of the seat surface 10. The headrest 30 is provided projecting upward from the upper end of the seat back 20 and is the part that supports the rear of the occupant's head 140. Furthermore, a steering wheel switch SW is provided in front of the occupant 100, which the occupant 100 uses their arm 150 to perform steering operations. When the occupant 100 operates the steering wheel SW, the reaction force is input to press the seat back 20 backward through the shoulder blades 132 and back 131. The seat back 20 is equipped with a cushion 21, a frame 22, a scapula support member 23, an actuator 24, and the like. The cushion portion 21 is formed of an elastic porous material such as urethane foam. The surface of the cushion portion 21 is covered with a sheet covering (not shown). As the seat surface, flexible, film-like materials such as woven fabrics