Seat control device

Abstract

The present invention provides a seat control device capable of detecting pinching with high precision regardless of the inclination angle of a seatback. A seat control device (1) is a control device of an electric seat that moves a seat portion (20a) of a seat (20) by a prescribed distance by a first motor (2) and inclines a seatback (20b) of the seat (20) by a prescribed angle by a second motor (4), wherein the seat control device (1) has a pinching detection portion (12) that detects a case where an object is pinched between the seats due to movement of the seat portion (20a) based on the rotation state of the first motor (2) and a prescribed threshold value. The threshold value varies according to the inclination angle so that pinching becomes easier to detect as the inclination angle of the seatback (20b) becomes larger.

Description

Technical Field

[0001] This invention relates to a device for controlling electric seats equipped in vehicles and the like, and more particularly to a seat control device having the function of detecting foreign objects trapped between the seats. Background Technology

[0002] In vehicles such as four-wheeled vehicles, there are electric seats that move forward and backward by rotating a motor. Previously, adjusting the fore-and-aft position of such electric seats involved manually operating a control unit located near the seat to move it forward or backward. However, in recent years, vehicles have emerged that pre-register seat positions according to user preferences, recognize the user while riding, and automatically move the seat to the position corresponding to that user.

[0003] In vehicles with automatic seat position adjustment functions as described above, if the front seat automatically moves backward while a person is sitting in the rear seat or an item is placed on the rear seat, the person or item may become trapped between the front and rear seats, threatening safety. The same thing can happen with manually operated electric seats. Therefore, a seat control device is required to have the function of detecting a trapping situation between the seats and quickly stopping the motor if trapping occurs. Seat control devices with such trapping detection functions are disclosed in Patent Documents 1-3.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2016-129449

[0005] Patent Document 2: Japanese Patent Application Publication No. 2007-131138

[0006] Patent Document 3: Japanese Patent Application Publication No. 2011-42300

[0007] Among electric seats, there are those that can automatically adjust not only their fore-and-aft position but also the tilt angle of their backrest. In this case, according to the inventor's analysis, the load applied to the motor (clamping load) differs depending on whether the seat moves backward and clamps into the backrest at a small tilt angle or a large tilt angle. The clamping load is larger when the backrest tilt angle is small and smaller when the tilt angle is large; details will be explained later.

[0008] Therefore, if the threshold for clamping detection is set to a large value because the focus is on the large clamping load when the backrest tilt angle is small, then when clamping occurs at a large tilt angle, the clamping load will not exceed the threshold, making it difficult to detect clamping. On the other hand, if the threshold for clamping detection is set to a small value because the focus is on the small clamping load when the backrest tilt angle is large, then even if clamping does not occur at a small tilt angle, the clamping load may exceed the threshold due to the force caused by interference, resulting in false detection of clamping. Summary of the Invention

[0009] The objective of this invention is to provide a seat control device that can detect clamping with high accuracy regardless of the tilt angle of the seat back.

[0010] The first invention discloses a seat control device for controlling an electric seat. The electric seat moves the seat a predetermined distance using a first motor and tilts the backrest at a predetermined angle using a second motor. The seat control device includes a clamping detection unit that detects objects clamped between the seats due to the seat movement, based on the rotation state of the first motor and a predetermined threshold. The threshold varies with the tilt angle, making it easier to detect clamping as the tilt angle of the backrest increases.

[0011] Thus, for example, when the backrest tilt angle is small, a larger threshold is applied to a larger clamping load, and when the backrest tilt angle is large, a smaller threshold is applied to a smaller clamping load. Therefore, it is possible to use the optimal threshold corresponding to the tilt angle to determine whether clamping has occurred, preventing false detection of clamping due to a small threshold or, conversely, failure to detect clamping due to a large threshold, thereby improving the detection accuracy of clamping.

[0012] In the first invention, the threshold can be continuously varied according to the tilt angle of the backrest, or it can be varied in stages according to the tilt angle of the backrest.

[0013] The second invention discloses a seat control device for controlling an electric seat. The electric seat moves the seat a predetermined distance using a first motor and tilts the backrest at a predetermined angle using a second motor. The seat control device includes: a first clamping detection unit that detects an object clamping between the seats due to seat movement based on the rotation state of the first motor and a first threshold value; and a second clamping detection unit that detects an object clamping between the seats due to backrest tilting based on the rotation state of the second motor and a second threshold value. The first threshold value varies with the tilt angle, making clamping easier to detect as the tilt angle of the backrest increases, while the second threshold value does not vary with the tilt angle of the backrest.

[0014] In the second invention, the seat control device may also include a control unit that controls the operation of the first motor and the second motor based on the detection results of the first clamping detection unit and the second clamping detection unit. If clamping is detected by at least one of the first and second clamping detection units, the control unit either stops the first motor and the second motor or reverses at least one of the first motor and the second motor for a certain period of time.

[0015] In the second invention, the first threshold can also be continuously changed according to the tilt angle of the backrest, or it can be changed in stages according to the tilt angle of the backrest.

[0016] According to the present invention, a seat control device is provided that can detect clamping with high accuracy regardless of the tilt angle of the seat back. Attached Figure Description

[0017] Figure 1 This is a block diagram of an electric seat system having a seat control device according to the first embodiment of the present invention.

[0018] Figure 2 This is a graph showing an example of a threshold that varies depending on the seat angle.

[0019] Figure 3 This is a graph showing another example of the threshold that varies depending on the seat angle.

[0020] Figure 4 This is a graph showing another example of the threshold that varies depending on the seat angle.

[0021] Figure 5 This diagram illustrates the difference in clamping load caused by the seat angle.

[0022] Figure 6 This diagram illustrates the difference in clamping load caused by the seat angle.

[0023] Figure 7 This diagram illustrates the clamping load when the seat angle is small.

[0024] Figure 8 This diagram illustrates the clamping load when the seat angle is large.

[0025] Figure 9 This is a block diagram of an electric seat system having a seat control device according to the second embodiment of the present invention.

[0026] Figure 10 This is a diagram illustrating an application example of the second embodiment.

[0027] Label Explanation

[0028] 1: Seat control device; 2: First motor; 4: Second motor; 11: Control unit; 12: Clamping detection unit; 12a: First clamping detection unit; 12b: Second clamping detection unit; 17: Threshold storage unit; 17a: First threshold storage unit; 17b: Second threshold storage unit; 20: Seat; 20a: Seat part; 20b: Backrest; 30: Seat control device; 100, 200: Electric seat system; α, β, θ1, θ2, θ3: Seat angle (backrest tilt angle); Ka, Kb, Kc, Kd: Judgment threshold. Detailed Implementation

[0029] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same or corresponding parts are labeled with the same reference numerals. Hereinafter, a seat control device mounted in a vehicle is listed.

[0030] Figure 1 An example of a seat control device 1 according to a first embodiment of the present invention and an electric seat system 100 using the seat control device 1 is shown. The electric seat system 100, for example, is mounted on a four-wheeled vehicle and includes a seat control device 1, a first motor 2, a sliding mechanism 3, a second motor 4, a tilt adjustment mechanism 5, an operation unit 6, an ID input unit 7, a seat position detection unit 8, a seat angle detection unit 9, a motor current detection unit 10, and a seat 20. The seat 20 is an electric seat driven by motors 2 and 4 in the X and Y directions. In this embodiment, the electric seat system 100 has the function of recognizing the user and automatically moving the seat 20 to a pre-registered position, as described at the beginning.

[0031] The first motor 2 is a motor used to move the seat portion 20a of the seat 20 along the X direction (front-to-back direction). The sliding mechanism 3 is connected to the seat portion 20a and converts the rotational motion of the first motor 2 into linear motion, so that the seat portion 20a moves a predetermined distance along the X direction.

[0032] The second motor 4 is a motor used to tilt the backrest 20b of the seat 20 along the Y direction. The tilt adjustment mechanism 5 is connected to the backrest 20b, and with the rotation of the second motor 4, the tilt adjustment mechanism 5 tilts the backrest 20b by rotating it by a predetermined angle along the Y direction.

[0033] The operation unit 6 consists of a switch for registering the X-direction position of the seat 20 or for manually operating the seat 20. The ID input unit 7 consists, for example, a communication circuit that communicates with an electronic key held by the user and reads the user's identification information (ID) from that electronic key. The seat position detection unit 8 detects the X-direction position of the seat 20 based on the rotation amount of the first motor 2. The seat angle detection unit 9 detects the tilt angle of the backrest 20b of the seat 20 based on the rotation amount of the second motor 4. The motor current detection unit 10 detects the motor current flowing in the first motor 2 and the second motor 4.

[0034] The seat control device 1 includes a control unit 11, a first motor drive unit 13, a second motor drive unit 14, a seat position storage unit 15, a seat angle storage unit 16, and a threshold storage unit 17.

[0035] The control unit 11, consisting of a CPU and the like, controls the overall operation of the seat control device 1. The control unit 11 includes a clamping detection unit 12. The function of this clamping detection unit 12 is actually implemented through software. The clamping detection will be described in detail later.

[0036] The first motor drive unit 13 is composed of circuits that generate drive signals (e.g., PWM signals) for rotating the first motor 2. The second motor drive unit 14 is also composed of circuits that generate drive signals (same as above) for rotating the second motor 4.

[0037] The seat position storage unit 15 stores the position of the seat 20 for each user registered by operating the operation unit 6. Similarly, the seat angle storage unit 16 stores the tilt angle of the backrest 20b of the seat 20 for each user registered by operating the operation unit 6.

[0038] The threshold storage unit 17 stores a determination threshold for the clamping detection unit 12 to determine whether there is clamping between the seats. This determination threshold will be explained in detail later.

[0039] In the electric seat system 100 with the above structure, when a user enters the vehicle and inputs the user's ID into the ID input unit 7 from an electronic key or the like, or performs a prescribed operation through the operation unit 6, the seat 20 is automatically moved to a prescribed position under the control of the seat control device 1, and the backrest 20b of the seat 20 is tilted at a prescribed angle.

[0040] Specifically, the control unit 11 reads the corresponding user's seat position stored in the seat position storage unit 15 and the corresponding user's seat angle stored in the seat angle storage unit 16. Then, based on this information, the control unit 11 instructs the first motor drive unit 13 and the second motor drive unit 14 on the amount and direction of rotation of each motor.

[0041] The first motor drive unit 13 rotates the first motor 2 by a predetermined amount in a predetermined direction according to the command from the control unit 11. This causes the seat portion 20a of the seat 20 to move in the X direction via the sliding mechanism 3. The position of the moving seat 20 is detected by the seat position detection unit 8. When the detected seat position matches the position read from the seat position storage unit 15, the control unit 11 stops the first motor 2 via the first motor drive unit 13.

[0042] Furthermore, the second motor drive unit 14 rotates the second motor 4 by a predetermined amount in a predetermined direction according to the command from the control unit 11. This causes the backrest 20b of the seat 20 to rotate in the Y direction via the tilt adjustment mechanism 5. When the rotation angle of the backrest 20b matches the seat angle read from the seat angle storage unit 16, the control unit 11 stops the second motor 4 via the second motor drive unit 14.

[0043] Next, we will explain in detail the detection of clamping between seats. Figure 5 and Figure 6 This illustrates a state where an object Z is sandwiched between the front seat 20 and the rear seat 21. Object Z could be, for example, cargo, a person's leg, an animal, etc. Figure 5 and Figure 6 In all cases, the object Z was sandwiched between the front and rear seats 20 and 21 because the front seat 20 was moved in the direction of the arrow (towards the rear).

[0044] Here, in Figure 5 In the middle, the tilt angle α of the backrest 20b of the seat 20 is small; conversely, in Figure 6 In the middle, the tilt angle β of the backrest 20b of seat 20 is large. The force acting on the backrest 20b as a reaction force from the clamped object Z is... Figure 5 , Figure 6 The same applies, but due to this reaction force, it is transmitted through sliding mechanism 3 ( Figure 1 The load (clamping load) applied to the first motor 2 is in Figure 5 and Figure 6 Different from China.

[0045] That is, as mentioned at the beginning, the tilt angle α of the backrest 20b is small. Figure 5 In this case, the clamping load applied to the first motor 2 is large, and the tilt angle β of the backrest 20b is large. Figure 6In this case, the clamping load applied to the first motor 2 is small. This will be explained in more detail below.

[0046] Figure 7 It is used to deal with what has happened Figure 5 A schematic diagram illustrating the clamping load applied to the first motor 2 under clamping conditions. Figure 7 For simplicity, the seat 20a and backrest 20b of the seat 20 are represented by straight lines. The sliding mechanism 3 and tilt adjustment mechanism 5 are also simplified in this representation. Figure 7 The first motor 2, which drives the sliding mechanism 3, is omitted in the text. Figure 1 ) and the second motor 4 that drives the tilt adjustment mechanism 5. Figure 1 The illustration is shown.

[0047] exist Figure 7 In the text, P1 indicates that it comes from... Figure 5 The reaction force Fp of object Z acts on the point on the backrest 20b of seat 20. This reaction force Fp acts perpendicularly to the backrest 20b. Q represents the center of rotation (axis of rotation) of the backrest 20b. L1 represents the distance between P1 and Q, and α represents the distance between P1 and Q. Figure 5 The same tilt angle as α.

[0048] The horizontal component Fa of the reaction force Fp represents the force applied to the first motor 2 via the sliding mechanism 3. Figure 1 The clamping load is calculated using the following formula.

[0049] Fa=Fp×cosα…(1)

[0050] Additionally, Ta indicates that the force applied to the second motor 4 is via the tilt adjustment mechanism 5. Figure 1 The clamping torque is calculated using the following formula.

[0051] Ta=Fp×L1…(2)

[0052] Figure 8 It is used to deal with what has happened Figure 6 A schematic diagram illustrating the clamping load applied to the first motor 2 under clamping conditions. Figure 8 In simplified representation, seat 20 includes seat 20a, backrest 20b, sliding mechanism 3, and tilt adjustment mechanism 5. P2 indicates that it comes from... Figure 6 The reaction force Fp of object Z acts on point 20b of the backrest 20 of seat 20. Furthermore, even if the location of the reaction force changes, the magnitude of the reaction force remains almost unchanged; therefore, it is assumed that... Figure 8 The reaction force Fp and Figure 7 The reaction force Fp is equal to that of the reaction force. Q represents the reaction force Fp. Figure 7With the same center of rotation (axis of rotation), L2 represents the distance between P2 and Q. β represents the distance between P2 and Q. Figure 6 The same tilt angle as β, which is greater than Figure 7 The value of α is larger (β > α).

[0053] exist Figure 8 In the diagram, the horizontal component Fb of the reaction force Fp represents the force applied to the first motor 2 via the sliding mechanism 3. Figure 1 The clamping load is calculated using the following formula.

[0054] Fb=Fp×cosβ…(3)

[0055] Additionally, Tb indicates that the force applied to the second motor 4 is via the tilt adjustment mechanism 5. Figure 1 The clamping torque is calculated using the following formula.

[0056] Tb=Fp×L2…(4)

[0057] Here, the results calculated using equation (1) are compared. Figure 7 The clamping load Fa and the result calculated by equation (3) Figure 8 The clamping load Fb, since β>α, therefore, if the reaction force Fp is the same, then Fa>Fb. That is, when clamping occurs, the smaller the tilt angle of the backrest 20b, the greater the clamping load applied to the first motor 2, and the larger the tilt angle of the backrest 20b, the smaller the clamping load applied to the first motor 2.

[0058] Furthermore, whether clamping has occurred is determined based on whether the clamping load exceeding a certain value has persisted for a predetermined time. In this case, when the clamping load increases, the rotational speed of the first motor 2 decreases, and the current flowing in the motor increases; therefore, the increase or decrease in the clamping load is related to the increase or decrease in the motor current. Therefore, the motor current detection unit 10 ( Figure 1 The current flowing in the first motor 2 is detected, and the change in motor current is calculated in the clamping detection unit 12. The change in current is compared with a threshold value, thereby enabling clamping detection.

[0059] However, if we focus on the small tilt angle α of the backrest 20b Figure 7 In the case where the clamping load Fa is large, and the threshold is set to a large value, then when the image Figure 8 When clamping occurs when the backrest 20b is tilted at a large angle β, the clamping load Fb does not exceed the threshold due to the large threshold, making it difficult to detect clamping.

[0060] On the other hand, if we focus on the large tilt angle β of the backrest 20b Figure 8 In the case where the clamping load Fb is small, and the threshold is set to a small value, then in Figure 7 When the backrest is tilted at a small angle α (20b), the force caused by interference is applied to the seat, and even if clamping does not occur, the clamping load Fa can easily exceed the threshold, leading to false clamping detection. Interference can occur, for example, when a passenger sitting in the seat shakes their body.

[0061] Therefore, in this invention, the threshold value is varied according to the tilt angle of the backrest 20b, making it easier to detect clamping as the tilt angle of the backrest 20b increases, thereby solving the aforementioned problem. Hereinafter, refer to... Figures 2-4 The details are explained below.

[0062] Figure 2 An example of the threshold used in this invention is shown. The horizontal axis of the graph represents the seat angle (the tilt angle of the backrest 20b), and the vertical axis represents the threshold used to determine whether there is clamping (hereinafter referred to as the "determination threshold"). In this example, the determination threshold is a value of a function F(θ) that varies continuously with respect to the seat angle θ, and the determination threshold gradually decreases as the seat angle θ increases.

[0063] For example, in state (a) where the seat angle is 0°, the decision threshold is Ka (initial value). In state (b) where the backrest 20b is slightly tilted and the seat angle is θ1, the decision threshold decreases from Ka to Kb. In state (c) where the backrest 20b is tilted further and the seat angle is θ2, the decision threshold decreases further from Kb to Kc. In state (d) where the backrest 20b is tilted to its maximum and the seat angle is θ3, the decision threshold decreases further from Kc to Kd.

[0064] If such a threshold is used, then when the seat angle α is small... Figure 7 In cases where the clamping load Fa is large, a larger threshold is applied, especially when the seat angle β is large. Figure 8 In this case, a smaller threshold is applied to a smaller clamping load Fb. Therefore, the optimal threshold corresponding to the seat angle can be used to determine whether clamping has occurred, thus preventing false detection of clamping due to a small threshold or, conversely, failure to detect clamping due to a large threshold, thereby improving the detection accuracy of clamping.

[0065] Figure 3 Another example of a decision threshold is shown. In this example, the decision threshold changes in stages based on the seat angle; as the seat angle increases, the decision threshold gradually decreases.

[0066] For example, in state (a) where the seat angle is 0°, the decision threshold is Ka (initial value). In state (b) where the backrest 20b is slightly tilted and the seat angle is θ1, the decision threshold switches to Kb, which is smaller than Ka. In state (c) where the backrest 20b is tilted further and the seat angle is θ2, the decision threshold switches to Kc, which is smaller than Kb. In state (d) where the backrest 20b is tilted to its maximum and the seat angle is θ3, the decision threshold switches to Kd, which is smaller than Kc.

[0067] Even using such a threshold, when the seat angle α is small... Figure 7 In cases where the clamping load Fa is large, a larger threshold is also applied, especially when the seat angle β is large. Figure 8 In this case, a smaller threshold is applied to a smaller clamping load Fb. Therefore, the optimal threshold corresponding to the seat angle can be used to determine whether clamping has occurred, thus preventing false detection of clamping due to a small threshold or, conversely, failure to detect clamping due to a large threshold, thereby improving the detection accuracy of clamping.

[0068] Figure 4 Another example of determining the threshold is shown. This example is... Figure 3 A variation of the threshold is determined by the phased change. Figure 3 The situation is more refined. The result is that the change in the judgment threshold is related to... Figure 2 The situation is similar. By using such a judgment threshold, it is also possible to determine whether there is clamping based on the optimal threshold corresponding to the seat angle, thereby improving the detection accuracy of clamping.

[0069] Figure 9 An example of a seat control device 30 according to a second embodiment of the present invention and an electric seat system 200 using the seat control device 30 is shown. Figure 9 In the seat control device 30, two clamping detection units 12a and 12b and two threshold storage units 17a and 17b are provided. This point is related to... Figure 1 The first implementation differs. Other structures are different. Figure 1 The same, therefore omit the same. Figure 1 Explanation of repeated parts.

[0070] exist Figure 9 In this system, the first clamping detection unit 12a detects when an object is clamped between the seats due to the movement of the seat 20a, and the second clamping detection unit 12b detects when an object is clamped between the seats due to the tilting of the backrest 20b. The first threshold storage unit 17a stores a first threshold for the first clamping detection unit 12a to detect clamping, and the second threshold storage unit 17b stores a second threshold for the second clamping detection unit 12b to detect clamping.

[0071] The first clamping detection unit 12a determines whether clamping has occurred based on the motor current of the first motor 2 detected by the motor current detection unit 10 and the first threshold stored in the first threshold storage unit 17a. The second clamping detection unit 12b determines whether clamping has occurred based on the motor current of the second motor 4 detected by the motor current detection unit 10 and the second threshold stored in the second threshold storage unit 17b.

[0072] Here, the first threshold stored in the first threshold storage unit 17a is Figures 2-4 The threshold shown varies depending on the tilt angle (seat angle) of the backrest 20b. In contrast, the second threshold stored in the second threshold storage unit 17b is a fixed value that does not vary depending on the tilt angle of the backrest 20b. The reason for this is as follows.

[0073] The pinching caused by the tilt of the backrest 20b is achieved through comparison. Figure 7 and Figure 8 The clamping torques Ta and Tb, and the second threshold, are used for detection. However, according to equations (2) and (4) above, these torques Ta and Tb depend on the distances L1 and L2 (i.e., the positions where the reaction force Fp acts), and not on the tilt angle of the backrest 20b. Therefore, it is meaningless to make the second threshold vary according to the tilt angle.

[0074] In the second embodiment, the first clamping detection unit 12a and the second clamping detection unit 12b independently detect clamping. Then, the control unit 11 controls the operation of the first motor 2 and the second motor 4 based on the detection results of the first clamping detection unit 12a and the second clamping detection unit 12b.

[0075] In detail, such as Figure 10 As shown in (a), when the seat 20a moves while the backrest 20b is not tilted, thereby clamping an object Z between the seats 20 and 21, only the first clamping detection unit 12a detects the clamping, and the first motor 2 stops. As a result, both the first motor 2 and the second motor 4 are in a stopped state.

[0076] In addition, such as Figure 10 As shown in (b), when the seat 20a is not moving, and an object Z is sandwiched between the seats 20 and 21 due to the tilt of the backrest 20b, only the second clamping detection unit 12b detects the clamping, and the second motor 4 stops. As a result, both the first motor 2 and the second motor 4 are in a stopped state.

[0077] And, as Figure 10As shown in (c), when the movement of the seat 20a and the tilting of the backrest 20b occur simultaneously and in parallel, thereby clamping an object Z between the seats 20 and 21, both the first clamping detection unit 12a and the second clamping detection unit 12b detect the clamping, and the first motor 2 and the second motor 4 stop, and all motors become stopped.

[0078] According to the second embodiment described above, if at least one of the first clamping detection unit 12a and the second clamping detection unit 12b detects clamping, the control unit 11 stops the first motor 2 and the second motor 4. Therefore, even if clamping occurs... Figure 10 Any clamping in (a) to (c) can also ensure safety by stopping the motor.

[0079] In addition to the embodiments described above, various other embodiments can be adopted in this invention.

[0080] For example, in the above embodiment, an example is given where the first motor 2 and the second motor 4 are stopped when clamping is detected. However, it is also possible to reverse at least one of the first motor 2 and the second motor 4 (the motor on the side where clamping occurred) for a certain period of time, thereby moving the seat 20a of the seat 20 in the opposite direction or rotating the backrest 20b in the opposite direction to release the clamping state.

[0081] Furthermore, in the above embodiments, in Figure 1 The example given is that the first motor drive unit 13 and the second motor drive unit 14 are located on the seat control device 1, but these motor drive units 13 and 14 can also be located outside the seat control device 1. Figure 9 The same applies to China.

[0082] In addition, Figure 1 In this configuration, the first motor 2 and the second motor 4 are located externally to the seat control device 1, but these motors 2 and 4 can also be located within the seat control device 1. Figure 9 The same applies to China.

[0083] Furthermore, in the above-described embodiments, in Figure 2 The example given illustrates how the judgment threshold decreases in a curved manner as the seat angle increases, but the judgment threshold can also decrease linearly as the seat angle increases. Alternatively, the judgment threshold can decrease continuously within a specified range of seat angles, while the judgment threshold decreases intermittently in other ranges.

[0084] Furthermore, while the above embodiment provides an example of setting a threshold for the motor current, a threshold for the motor speed can also be set. In short, whether or not there is a clamping issue can be determined simply by comparing the result of a parameter indicating the motor's rotational state, such as current or speed, with the threshold.

[0085] Furthermore, while the above embodiments exemplify a vehicle that automatically adjusts the seat position based on the user, the present invention can also be applied to vehicles that do not possess such a function.

[0086] Furthermore, while the above embodiments provide examples of seat control devices mounted on vehicles such as four-wheeled vehicles, the present invention can also be applied to seat control devices used in fields other than vehicles.

Claims

1. A seat control device for controlling an electric seat, wherein the electric seat moves the seat a predetermined distance by a first motor and tilts the backrest at a predetermined angle by a second motor, characterized in that, The seat control device has a clamping detection unit that detects when an object is clamped between the seats due to seat movement, based on the rotation state of the first motor and a predetermined threshold. The threshold is a threshold that varies according to the tilt angle of the backrest, making it easier to detect clamping as the tilt angle of the backrest increases. A large threshold is applied when the tilt angle of the backrest is small, and a small threshold is applied when the tilt angle of the backrest is large.

2. The seat control device according to claim 1, characterized in that, The threshold value changes continuously depending on the tilt angle of the backrest.

3. The seat control device according to claim 1, characterized in that, The threshold value changes in stages depending on the tilt angle of the backrest.

4. A seat control device for controlling an electric seat, wherein the electric seat moves the seat a predetermined distance by a first motor and tilts the backrest at a predetermined angle by a second motor, characterized in that... The seat control device has: The first clamping detection unit detects the situation where an object is clamped between the seats due to the movement of the seat portion, based on the rotation state of the first motor and a first threshold. The second clamping detection unit detects when an object is clamped between the seats due to the backrest tilt, based on the rotation state of the second motor and a second threshold. The first threshold is a threshold that varies according to the tilt angle of the backrest, making it easier to detect clamping as the tilt angle of the backrest increases. A larger threshold is applied when the tilt angle of the backrest is small, and a smaller threshold is applied when the tilt angle of the backrest is large. The second threshold is a threshold that does not change based on the tilt angle of the backrest.

5. The seat control device according to claim 4, characterized in that, The seat control device further includes a control unit that controls the operation of the first motor and the second motor based on the detection results of the first clamping detection unit and the second clamping detection unit. If at least one of the first clamping detection unit and the second clamping detection unit detects clamping, the control unit stops the first motor and the second motor, or reverses at least one of the first motor and the second motor for a certain period of time.

6. The seat control device according to claim 4 or 5, characterized in that, The first threshold value changes continuously according to the tilt angle of the backrest.

7. The seat control device according to claim 4 or 5, characterized in that, The first threshold changes in stages according to the tilt angle of the backrest.

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