JPS63207741A - Vehicle seat - Google Patents

Abstract

PURPOSE:To enable an operation without waste and reduce power consumption by providing a driving mechanism for moving a seat back and forth by the drive of a motor and drivingly controlling said motor at the time of detecting a condition for enabling the getting on/off of a rider. CONSTITUTION:In a device in which a seat is moved back and forth by the drive of a motor 208, the motor 206 is controlled by a microcomputer 403 via a motor driving circuit 404. The microcomputer 403 controls a relay circuit 408 so as to feed power to the motor driving circuit 404 when at least one of the following conditions are detected: (1) when an accessory switch ACC is switched over from off to on and vice versa, (2) when a key position switch UW is switched over from off to on and vice versa, (3) when the output port P22 of the microcomputer 403 becomes an H condition, and (4) when a manual switch MANU for selecting the advancing or backing condition of the seat is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an on-vehicle seat such as a driver seat or a passenger seat on a vehicle, and more particularly to an on-vehicle seat that automatically positions the seat.

[Conventional technology]

Conventionally, vehicle seats have been proposed in which the optimal position is stored in an electronic control device and then restored to the optimal position by operating a predetermined switch. Such a vehicle seat has been proposed, for example, in Japanese Patent Application Laid-open No. 76334/1983.

In the vehicle seat disclosed in Japanese Patent Application Laid-open No. 58-76334, the optimum position of the vehicle seat set in the electronic control device can be easily restored by operating a predetermined switch.

However, when the vehicle seat is maintained at the optimum position suitable for driving the vehicle, there is a problem in that the legroom for the occupant to get on and off the vehicle is narrow.

Therefore, when a passenger gets in or out of a vehicle, the seat is moved to the rear of the vehicle to increase the space under the passenger's feet.
After a passenger gets in or out of a vehicle, it is desirable to automatically return the vehicle seat to its optimal position.

An on-vehicle seat that achieves such control is proposed, for example, in Japanese Patent Laid-Open No. 76336/1983.

The vehicle seat disclosed in Japanese Patent Application Laid-Open No. 58-76336 detects the open/closed state of a vehicle door and can automatically move the vehicle seat to the rear of the vehicle when the door is open.

[Problem that the invention seeks to solve]

However, the conventional vehicle seat has the problem that the vehicle seat moves frequently when the door is opened and closed, resulting in high power consumption.

Furthermore, there is another problem in that the on-vehicle seat moves even after the occupant of the vehicle gets out of the vehicle, resulting in unnecessary movement of the on-vehicle seat.

Therefore, the technical problem of the present invention is to move the seat on the vehicle only when the passenger gets on and off the vehicle.In particular, when the passenger gets off the vehicle, the seat on the vehicle is moved toward the rear of the vehicle. Another technical problem is to construct an on-vehicle seat that returns the on-vehicle seat to its optimum position after the occupant gets on the vehicle.

(Means for solving the problem) The technical means taken to achieve the above-mentioned technical problem are as follows: A seat disposed on a vehicle; A motor fixed to the seat; Driving the motor. transmitting force to the vehicle body and moving the seat forward;
or a seat forward/reverse drive mechanism for moving the seat backward; a motor drive means for supplying electric power to the motor; a vehicle state detection means for detecting that an occupant can get on or off the vehicle; and an output of the vehicle state detection means. An electronic control means for controlling the motor drive means accordingly is provided.

(Function) According to the above-described configuration of the present invention, the electronic control means controls the motor drive means based on the condition of the occupant detected by the vehicle condition detection means, so that the vehicle seat is moved only when the occupant gets into or out of the vehicle. can be moved.

Further, in a preferred embodiment of the present invention, the electronic control means includes: a forward switch means for advancing the seat in response to an operation by an occupant; a forward control means for advancing the seat when the forward switch means is operated; The vehicle includes a reverse switch means for moving the seat backwards when operated by a passenger; and a reverse control means for moving the seat backwards when the reverse switch means is operated.

This allows the occupant to easily set the optimum position of the vehicle seat.

In another preferred embodiment of the present invention, the vehicle state detection means includes: a gear position detection means that detects a gear position of a vehicle transmission; and an ignition key cylinder state that detects a state of an ignition key cylinder of the vehicle. A detection means is provided.

Then, by detecting a change in the state of at least one of the gear speed detecting means and the ignition key cylinder state detecting means, it is possible to determine whether the occupant is getting out of the vehicle or getting into the vehicle.

An on-vehicle seat can be constructed in which the on-vehicle seat is slid toward the rear of the vehicle, and the on-vehicle seat is returned to an optimal position after the occupant gets on the vehicle.

In another preferred embodiment of the present invention, the electronic control means further includes: return position setting means for setting the return position of the seat; forward return control means for advancing the seat to the return position; and fixed distance backward movement control means for moving the seat backward by a predetermined distance.

By doing so, it is possible to configure an on-vehicle seat that automatically moves backward by a predetermined travel distance when the occupant gets off the vehicle, and automatically returns to the return position after the occupant gets on the vehicle.

Furthermore, in another preferred embodiment of the present invention, the electronic control means includes a safety device for canceling operation of the motor drive means.

By doing so, it is possible to prevent the vehicle seat from being inadvertently moved due to a malfunction of the electronic control means or an erroneous operation by the occupant, thereby providing a safer vehicle seat. Furthermore, when the vehicle seat has completely moved, the operation of the motor drive means can be canceled, and a more reliable vehicle seat can be constructed.

(Example) Examples of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view depicting an example in which the vehicle seat 1 of the present invention is used as a driver's seat.

The vehicle seat 1 of the present invention is disposed in a vehicle interior so as to be movable in a direction parallel to the longitudinal direction of the vehicle.

The vehicle seat 1 consists of two parts: a seat back SEB and a seat SE. The seat back SEB of the vehicle seat l is pivotally fixed to the seat SE so as to be tiltable, and can be tilted in the longitudinal direction of the vehicle as required. Further, the seat SE is fixed to the floor surface of the vehicle compartment so as to be slidable in a direction parallel to the longitudinal direction of the vehicle, and can be moved in the longitudinal direction of the vehicle as necessary.

In the vehicle interior, in addition to the vehicle seat 1, there are a shift position switch SPS for controlling the gear stage of the vehicle transmission;
Ignition key cylinder IOC for starting the engine, brake switch BR3 whose contacts close when the brake pedal BP is operated, and optimal position C of the vehicle seat 1
A manual switch MANU, etc., operated by the passenger to set M is provided.

FIG. 2 is a perspective view depicting a seat forward/backward movement drive mechanism 200 for fixing the seat SE to the floor surface of the vehicle interior.

A pair of upper rails 202 are slidably fitted into each of the pair of lower rails 201 fixed to the floor surface of the vehicle compartment.

At approximately the center of the lower rail 201 in the longitudinal direction, a frame 2 is provided.
03 is fixed by welding and connects the rain rail 201. The frame 203 is made up of two members, and both members are fixed to the floor surface of the vehicle compartment at approximately the center of the rain rail 201. The shape of the frame 203 is molded to match the shape of the floor surface of the vehicle interior. The frame 203 is provided with a pair of internally threaded portions 207 that are screwed into a pair of threaded rods 206 . Further, a convex portion 211 for determining the maximum backward movement distance of the vehicle seat 1 is fixed to the frame 203 by welding.

Frames 204 and 205 are fixed to both ends of the rain rail 202 by welding to connect the rain rail 202 and keep it parallel. A pair of threaded rods 206 are rotatably supported on the frames 204 and 205 so as to be parallel to the rain rail 202.

A motor 208 is identified on the frame 204 . The motor 208 is a DC motor that rotates in either forward or reverse direction depending on the voltage applied to the connector 213.

A pair of speed reduction mechanisms 209 are provided between the motor 208 and both threaded rods 206, and are defined on the frame 204 together with the motor 208. The deceleration mechanism 209 is a device that decelerates the rotation of the output shaft of the motor 208, changes the direction of rotation, and transmits the rotation to the threaded rod 206.

A seat position sensor PS that generates a pulse according to the rotational position of the output shaft of the motor 208 is built inside one of the speed reduction mechanisms 209 .

The output pulse of the seat position sensor PS is then taken out via the connector 210. Seat position sensor PS
consists of a permanent magnet fixed to the outer peripheral surface of the output shaft of the motor 208, and a Hall element that detects the magnetic flux generated by the permanent magnet.

Further, a rear most detection switch RM is disposed at a position facing the convex portion 211 formed on the frame 203. The rear most detection switch RM is the motor 208
is fixed to the rear side surface of the frame 203, and is operated by the convex portion 211 to close the contact when the frame 203 moves fully toward the rear side (toward the rear of the vehicle). The state of the contacts of the rearmost detection switch RM is retrieved via the connector 212.

The seat forward/reverse drive mechanism 200 configured as described above can slide the upper rail 202 in the longitudinal direction of the vehicle with respect to the lower rail 201 according to the rotation of the motor 208.

That is, when the motor 208 is rotated, the rotation of the motor 208 is transmitted to both threaded rods 206 via both reducer sides 209. When both threaded rods 206 rotate, both female threaded portions 207 screwed onto both threaded rods 206 are sent out in the axial direction of both threaded rods 206. However, since both female threaded portions 206 are fixed to the floor of the vehicle interior, the reaction thereof causes both threaded rods 206 to move relative to the floor of the vehicle interior. Further, the rain rail 201 is also fixed to the floor surface of the vehicle compartment, similarly to both female threaded portions 206. As a result, when the motor 208 rotates, the rain rail 202 moves forward relative to the rain rail 201 toward the front side (the front direction of the vehicle) or toward the rear side (the rear direction of the vehicle), depending on the rotation direction of the motor 208. Go backwards.

In this embodiment, the distance from the most backward position to the most forward position of the vehicle seat 1 is approximately 600 meters. That is, the maximum movement distance of the vehicle seat 1 in this embodiment is approximately 600 degrees.

This will be explained below with reference to FIG. FIG. 3 is a sectional view of the vehicle seat of the present invention.

A seat SE is fixed to the upper rail 202. Therefore, when the upper rail 202 moves forward toward the front side or backward toward the rear side with respect to the lower rail 201 fixed to the floor surface of the vehicle interior, the vehicle seat l moves together with the upper rail 202.

A manual switch MANU is provided on the side of the seat SE, and the occupant can move the vehicle seat 1 forward or backward by operating the manual switch MANU.

Furthermore, an electronic control unit ECU for controlling movement of the vehicle seat 1 is built inside the seat back SEH which is rotatably pivoted to the seat SE. Electronic control unit ECU, manual switch MANU, motor 208,
The seat position sensor PS and the rear most detection switch RM are connected by a conductive wire disposed along the frame of the seat.

This will be explained below with reference to FIG. FIG. 4 is a block diagram depicting the circuit configuration of the electronic control unit ECU of the present invention.

The electronic control unit ECU of the present invention has a microcomputer 403 as an electronic control means as a main component. A power supply terminal Vcc of the microcomputer 4.3 is connected to a battery 401 via a constant voltage power supply circuit 402. Therefore, ignition switch I
The power to the microcomputer 403 will not be cut off due to states such as C. Further, the constant voltage power supply circuit 403 has a built-in voltage reduction detection circuit 409. A set voltage Br is set inside the voltage reduction detection circuit 409. Then, the voltage reduction detection circuit 409 compares the battery voltage 10B and the set voltage Br, and the battery voltage 10B is the set voltage B.
When it becomes less than r, an output signal is generated. The output signal of the voltage reduction detection circuit 409 is input to the human port P10 of the microcomputer 403.

Furthermore, the microcomputer 403 has a ROM (R
ead 0nly Memory), RAM that temporarily stores data (Rando+w Access
Mea+ory), a 5 second timer (first timer means, second timer means), etc. are built-in.

The microcomputer 403 also includes a vehicle state detection means for detecting whether an occupant can get on or off the vehicle via a signal input circuit 405, and a safety device for canceling the operation of the motor drive means. It is connected.

An ignition switch IC and an accessory switch ACC are connected between the battery 401 and the signal input circuit 405. Both the ignition switch IG and the accessory switch ACC are switches provided inside the ignition key cylinder IGC, and depending on the rotation angle of the ignition key cylinder IGC, the contact state changes to the first
It changes as shown in the table.

The state of the contacts of the ignition switch IG is manually input to the manual boat P1 of the microcomputer 403 via the signal input circuit 405. In addition, accessory switch A
The state of the CC contact is input to the input port P2 of the microcomputer 403 via the signal input circuit 405.

Also, inside the ignition key cylinder IOC,
Ignition switch IG and accessory switch AC
In addition to C, a key position switch UW is provided. The key position switch UW is a switch that detects that a key is inserted into the ignition key cylinder [GC, and is turned on when the key is inserted and turned off when the key is removed. The state of the contacts of the key position switch UW is determined by the signal input circuit 4.
05 to the input port P3 of the microcomputer 403.

In addition, the input capo-1-P4 of the microcomputer 403
The state of the contact of the shift position switch SPS is inputted to the shift position switch SPS via the signal input circuit 405. The shift position switch SPS is a switch disposed in a space between a driver's seat and a passenger seat, and is a switch for selecting a gear stage of a vehicle transmission. shift position switch S
PS is a switch that is turned ON when the gear position of the vehicle transmission selected by the occupant is neutral or parking, and turned OFF when the gear position is other than that.

The state of the contact of the brake switch BR3 is input to the input port P5 of the microcomputer 403 via the signal input circuit 405. The brake switch BR3 is a switch that is linked to the brake pedal, and is turned on when the brake pedal is depressed, and turned off when the brake pedal is not depressed.

The input port P6 of the microcomputer 403 receives the state of the contact of the rear most detection switch RM, which is the maximum backward distance setting means, through the signal input circuit 405. The rear most detection switch RM is a switch that is turned ON when the vehicle seat 1 has moved far to the rear side (toward the rear of the vehicle), and is OFF when the vehicle seat L has not moved far to the rear side. It is.

Further, the microcomputer 403 is connected via a manual switch input circuit 407 to a forward switch means operated by the occupant to move the vehicle seat forward and a reverse switch means operated by the occupant to move the vehicle seat backward. has been done.

The state of the contacts of the manual switch MANU is input to the input ports P7 and P8 of the microcomputer 403 via the manual switch input circuit 407. The manual switch MANU is a so-called changeover switch equipped with one movable contact COM and two fixed contacts FRD and REV.

The manual switch MANU is a switch that changes the states of two fixed contacts FRD and REV in accordance with the operation by the occupant as follows. In the table below, mode I is a state in which the occupant is not operating the manual switch MANU, mode ■ is a state in which the occupant is operating the manual switch MANU to move the vehicle seat 1 forward, and mode ■ is a state in which the vehicle occupant is operating the manual switch MANU in order to move the vehicle seat 1 forward. Manual switch MA to reverse
This is the state in which the NU is being operated.

*ON means that the movable contact COM and the fixed contact are closed. OFF means that the movable contact COM and the fixed contact are closed.
1-P7, and the fixed contact REV is connected to the microcomputer 40 via the manual switch input circuit 407.
3 input port P8. Therefore, the connection state between the movable contact COM and the fixed contact FRD is input to the human power port P7 of the microcomputer 403, and the connection state between the movable contact COM and the fixed contact REV is input to the human power boat P8. In addition, manual switch input circuit 4
07 is connected to a terminal T3 of a relay circuit 40B, which will be described later. Then, the manual switch input circuit 407 connects the terminal T3 to the manual switch MA
When the state M of the NU is in mode I, it is set to the "L" state, and when it is in the mode (2) or (3), it is set to the "H" state.

Furthermore, the human power hoard P9 of the microcomputer 403
A pulse signal generated by the seat position sensor PS is inputted to the seat position input circuit 406. Furthermore, a counter that counts the number of pulses generated by the seat position sensor PS is configured inside the microcomputer 403 by a program, and the count value of this counter is set as the seat position cp indicating the current position of the vehicle seat 1. do.

In addition, the output port P20 of the microcomputer 403
, P21, the motor 2 is connected via the motor drive circuit 404.
08 is connected. The motor drive circuit 404 is connected to a battery 401 via a relay circuit 408, which will be described later, and is supplied with electric power for driving the motor 404 from the battery 401. Motor drive circuit 40
4 is the output of the microcomputer 403) P2O
, P21, the motor 208 is driven as shown in the table below.

Further, the electronic control unit ECU includes a relay circuit 408 that constitutes a part of the safety device. The relay circuit 408 is
In the initial state, the battery 401 and the motor drive circuit 404 are connected (connected state). The relay circuit 408 also includes the manual switch MANU described above.
, accessory switch ACC, key position switch UW.

Shift position switch SPS and brake switch B
The state of R3 and the output port of the microcomputer 403
1-P22 status is input.

The relay circuit 408 operates when the shift position switch SPS is in the OFF state and when the brake switch BR is in the OFF state.
3 is turned ON, it is determined that there is a danger to the occupants, and the connection between the battery 401 and the motor drive circuit 404 is cut off (cut off state).

That is, if at least one of the two states shown in the table below is detected, the operation of the motor drive circuit 404 is canceled and movement of the onboard seat 1-1 is prohibited. In addition, the relay circuit 408 has a self-holding function, detects when the brake switch BR3 is turned on, and
After cutting off the connection between 01 and the motor drive circuit 404, the motor drive circuit 404 is held in an inoperable state until a predetermined state is detected.

*The relay circuit 408 in Table 4 can be in any state: ■ When the state of accessory switch ACC changes from 0FF-ON, ■ When the state of accessory switch ACC changes from ON to OFF, ■ Key position switch UW When the state becomes 0FF-ON,
■When the key position switch UW is in the 0N-OFF state, ■When the output port P22 of the microcomputer 403 is in the "H" state, ■When the manual switch MANU is in mode ■ or mode ■ If at least one of these conditions is detected, it is determined that there is no danger to the occupants, and the battery 401 and motor drive circuit 404 are connected. That is, when at least one of the six states shown in the table below is detected, the motor drive circuit 404 is enabled to operate, and the vehicle seat 1 is enabled to move.

In addition, the relay circuit 408 has a self-holding function,
After the conditions shown in the table below are detected and the battery 401 and motor drive circuit 404 are connected, the motor drive circuit 404 continues to be enabled until a predetermined condition is detected.

*Any state is acceptable Table 5, FIG. 9 shows an equivalent circuit diagram of the relay circuit 408 of this embodiment.

An accessory switch ACC is connected to terminal T4 of the relay circuit 408. Therefore, the state of the terminal T4 is "H" when the accessory switch ACC is ON, and "L" when the accessory switch ACC is OFF.

Further, a key position switch UW is connected to the terminal T5 of the relay circuit 408.

Therefore, the state of the terminal T5 is "L" when the key position switch UW is ON, and is "H" when the accessory switch ACC is OFF.

Terminal T4 and Terminal T5 are both connected to OR Gate 9.
01. Further, the output signal of the OR gate 901 is input to a differentiating circuit 902. Differential circuit 902
is a falling edge detection circuit and a rising edge detection circuit.
The detection circuit detects both edges of the output signal of the OR gate 901 and outputs an "H" signal with a predetermined pulse width. That is, the differentiating circuit 902 is a circuit that outputs an "11" signal with a predetermined pulse width when the state of the accessory switch ACC or the key position switch UW changes.

Furthermore, the output port P22 of the microcomputer 403 is connected to the terminal T8 of the relay circuit 408. Terminal T8 is input to OR gate 903.

Therefore, the OR gate 903 receives the output signal of the differentiating circuit 902 and the output port P of the microcomputer 403.
22 states are input. Then, the output signal of the OR gate 903 is inputted to the set terminal S of the RS flip-flop circuit 904.

On the other hand, a brake switch BR3 is connected to a terminal T7 of the relay circuit 408. Therefore, the state of terminal T7 is "H" when brake switch BR3 is ON, and "H" when brake switch BR3 is OFF.
The terminal T7 is input to the reset terminal R of the RS flip-flop circuit 904.

The state of the output terminal Q of the RS flip-flop circuit 904 is newly set when the conditions shown in the table below are satisfied, and is held until the next condition is satisfied.

Note that the set terminal S of the RS flip-flop circuit 904
When the reset terminal R and the reset terminal R become "H" at the same time, the reset terminal R has priority over the set terminal S.

In the table below, “↑” indicates a rising edge (Risin
g Edge) “↓” indicates a falling edge (Fall).
ing Edge).

*Table 6 which may be in any state A shift position switch SPS is connected to the terminal T6 of the relay circuit 408.

Therefore, the state of the terminal T6 becomes "L" when the shift position switch SPS is ON, and becomes "H" when the shift position switch SPS is OFF. Terminal T6 is input to AND gate 905 via inverting circuit 906.

Furthermore, the output terminal Q of the RS flip-flop circuit 904 is also connected to the AND gate 905 . Furthermore, the output signal of AND gate 905 is input to NOR gate 907.

On the other hand, a manual switch input circuit 407 is connected to a terminal T3 of the relay circuit 408. Therefore, the state of terminal T3 is the state of manual switch MA
It becomes "L" when the state of NU is in mode (2), and becomes "H" when the state of manual switch MANU is in mode (2) or (2).

Furthermore, terminal T3 is connected to Noah Gate 907.

Therefore, the state of the output terminal of the NOR gate 9o7 is as shown in the table below.

*Table 7 that can be in any state, that is, the state of the output terminal of the NOR gate 907 is ■R
The state of the output terminal Q of the S flip-flop circuit 904 is H.
” and the state of the shift position switch SPS is ON, it becomes "L", and ■The state of the output terminal Q of the RS flip-flop circuit 904 is "H", and the state of the shift position switch SPS is OFF. At the time of
In addition, the state of the manual switch input circuit 407 is
(2) When the state of the output terminal Q of the RS flip-flop circuit 904 is L'' (after the brake switch BR3 is turned on), the state of the manual switch input circuit 407 is set respectively.

The output terminal of the NOR gate 907 is connected to ζPNP through a resistor.
The base terminal of a type power transistor 908 is connected. The emitter terminal of the power transistor 9°8 is
Connected to terminal T1. Further, the collector terminal of power transistor 908 is connected to terminal T2.

Further, a battery 401 is connected to a terminal Tl of the relay circuit 408. Further, a motor drive circuit 404 is connected to a terminal T2 of the relay circuit 408.

Therefore, when the state of the output terminal of the NOR gate 907 is "L", the power transistor 908 is connected to the terminal T.
1 and terminal T2 to make the drive circuit 404 operational. Conversely, when the state of the output terminal of the NOR gate 907 is "H", the power transistor 908 cuts off the connection between the terminal TI and the terminal T2,
The drive circuit 404 is rendered inoperable.

Hereinafter, the operation of the electronic control unit ECU having the above-mentioned configuration will be explained in the fifth section.
This will be explained with reference to FIGS.

The electronic control unit ECU of the present invention executes the flowcharts shown in FIGS. 5 to 8.

First, the main routine shown in FIG. 5 will be explained. The microcomputer 403 is a manual switch MAN
When U is not operated, the main routine starts executing.

First, we will explain the flags used in the main routine. The flags used in the main routine and their functions are as follows. In the following description, the state in which the flag is set is defined as "1", and the state in which the flag is reset is defined as "0".

Manual mode flag MNMF: When this flag is set, the main routine calls a manual subroutine. That is, it is a flag to indicate a state in which the main routine must call a manual subroutine.

Return mode flag RTMF: When this flag is set, the main routine calls a return subroutine. That is, it is a flag to indicate a state in which the main routine must call a return subroutine.

Away mode flag AWMF: When this flag is set, the main routine calls the away subroutine. That is, this flag is used to indicate a state in which the main routine must call an away subroutine.

Return completion flag RET: If this flag is set, the main routine determines that the vehicle seat l has already returned to the optimum position CM. That is, this flag is used to prevent the main routine from calling the return subroutine twice.

Away completion flag AWAY...If this flag is set, the main routine determines that the vehicle seat 1 has already completed backward movement by a predetermined distance N from the optimum position CM. That is, this flag is used to prevent the main routine from calling the away subroutine multiple times.

The functions of each step of the main routine will be explained in order below.

(Step SL) In step st, the electronic control unit ECU is initialized. That is, the power supply to the motor 208 is stopped (both the output ports P20 and 21 of the microcomputer 403 are
”) and set the flags (manual mode flag MNMF, return mode flag RTMF, away mode flag AWMF, away complete flag AWAY).
and set the return completion flag RET).

(Step 82 to Step S9) In Step 82 to Step S9, the occupant performs processing for setting an optimal position CM suitable for driving the vehicle. That is, processing is performed when the occupant operates the manual switch MANU.

In step S2, the input port PL-P8. P
Store the state of 9. At the same time, it is determined whether the state of the input capacitor P9 has been reversed or not, and the result is stored in a temporary storage device provided inside the microcomputer 403.

In step S3, the state of the manual switch MANU is determined. Manual switch MANU is ON
(mode ■ or mode ■), step S
Proceed to step 4. Also, manual switch MANU is OFF.
When this is the case (mode I), the process advances to step S6.

In step S4, a manual mode flag MNMF is set, and a return mode flag RTMF and an away mode flag AWMF are reset.

In step S5, a manual subroutine is called and the motor 2 is activated according to the state of the manual switch MANU.
08 and returns to step S2 again.

In step S6, it is determined whether the manual mode flag MNMF is set.

If the manual mode flag MNMF is set, it is determined that the occupant has completed operating the manual switch MANU, and the process proceeds to step S7. Also,
If the manual mode flag MNMF is not set, the process advances to step SlO.

In step S7, the power supply to the motor 208 started in the manual subroutine is stopped, and the on-vehicle seat 1 is stopped.
Performs processing to make it stand still. That is, the output ports P20 and P21 of the microcomputer 403 are both set to the H'' state.

In step S8, the manual mode flag MNMF is reset.

In step S9, the current seat position CP is stored as the optimum position CM of the vehicle seat 1 (return position setting means).
. After executing the process of step S9, step S9 is executed again.
Processing starts from 2.

(Step SIO to Step 515) In Step SIO to Step S15, it is determined whether the occupant has completely boarded the vehicle, and a process is performed to call a return subroutine.

In step SIO, a change in the state of the key position switch UW is detected and determined, and a change in the state of the key position switch UW is detected.
When the state changes from OFF to ON (when the key is inserted into the ignition key cylinder IOC),
Proceed to step S12. Further, if the state of the key position switch UW has not changed from OFF to ON, the process advances to step Sll.

In step Sll, a state change of the accessory switch ACC is detected and determined, and the accessory switch ACC is
When the state changes from OFF to ON (when the ignition key cylinder IOC is rotated), the process advances to step S12. Further, if the state of the accessory switch ACC has not changed from OFF to ON, the process advances to step SL5.

In step S12, the state of the return completion flag RET is determined. If the return completion flag RET is set, it is determined that the vehicle seat 1 has already reached the optimal position CM, the subsequent processing is terminated, and the process returns to step S2. If the return completion flag RET is not set, the vehicle seat l is still at the optimal position CM.
It is determined that the vehicle has not moved forward to that point, and the process proceeds to step 813.

In step S13, a return mode flag RTMF is set, and an away completion flag AWAY and an away mode flag AWMF are reset.

In step S14, a return subroutine is called and the vehicle seat 1 is advanced toward the optimum position CM.

That is, the main routine calls the return subroutine in the following two cases.

■When the key is inserted into the ignition key cylinder IOC (step 510), or when the ignition key cylinder IOC rotates, the accessory switch AC (
When J<ON (step 511), and the away subroutine has been called after the previous return subroutine call (step 512) ■If the return mode flag RTMF is set (step 515) In 315, it is determined whether the return mode flag RTMF is set.

If the return mode flag RTMF is set, it is determined that the vehicle seat l should be moved forward, and the process proceeds to step 315. Also, if the return mode flag RTMF is not set,
Proceed to step S14.

(Steps 316 to 522) In steps 316 to S22, it is determined whether or not the occupant can get off the vehicle, and a process is performed to call an away subroutine.

In step 316, the state of the ignition switch IG is determined, and if the ignition switch IG is ON (state B in which the engine is operable), it is determined that the occupant cannot get out of the vehicle, and step S2 Return to Also, the ignition switch! If G is OFF, the process advances to step S17.

In step S17, a change in the state of the accessory switch 800 is detected and determined, and the accessory switch ACC is
If the state changes from ON to OFF (when the ignition key cylinder IC'C is rotated), the process advances to step S19. In addition, accessories - switch ACC
If the state has not changed from ON to OFF, the process advances to step 318.

In step 318, a change in the state of the key position switch UW is detected and determined, and a change in the state of the key position switch UW is detected.
When the state changes from ON to OFF (when the key is removed from the ignition key cylinder IOC),
The process advances to step S19.

Also, the state of key position switch UW changes from ON to O.
If it has not changed to FF, the process advances to step S22.

In step S19, the state of the away completion flag AWAY is determined. If the away completion flag AWAY is set, the vehicle seat 1 has already been moved a predetermined distance N (5
It is determined that the vehicle has moved backward by approximately 0a■ to lOOn), and the subsequent processing is terminated and the process proceeds to step S2. If the away completion flag AWAY has been reset, it is determined that the vehicle seat 1 has not moved backward by the predetermined distance N, and the process proceeds to step S20.

In step S20, the away mode flag AWMF is set, and the return completion flag RET and return mode flag RTMF are reset.

In step S21, an away subroutine is called and the vehicle seat 1 is moved backward by a predetermined distance N. That is, the main routine calls the away subroutine in the following two cases.

■When the ignition key cylinder IOC rotates and the accessory switch ACC turns ON (step 5)
17), or when the key is inserted into the ignition key cylinder IOC (step 318), and the return subroutine has been called after the previous away subroutine call (step 519) ■The away mode flag AWMF is set. (Step 515) In step S22, it is determined whether the away mode flag AWMF is set.

If the away mode flag AWMF is set, it is determined that the vehicle seat l is to be moved backward, and the process proceeds to step S21.

Furthermore, if the away mode flag AWMF is not set, the process returns to step S2.

As mentioned above, the main routine performs the following three processes.

(2) When the manual switch MANU is operated by the occupant, a process (manual subroutine) is executed to move the vehicle seat 1 (forward or backward) according to the state of the manual switch MANU.

■Refer to the state changes of accessory switch ACC and key position switch UW, and at least one state is OF.
When it changes from F to ON, it is determined that the occupant has completely boarded the vehicle, and a process (return subroutine) is executed to advance the vehicle seat 1 to the optimum position CM.

■Referring to the state of the ignition switch IG and the state changes of the accessory switch ACC and key position switch UW, the ignition switch IC is in the OFF state, and the state of at least one of the accessory switch ACC and the key position switch UW is changed from ON to OFF. If the change occurs, it is determined that the occupant can get off the vehicle, and a process (away subroutine) is executed to move the vehicle seat 1 backward by a predetermined distance N from the optimal position CM.

The manual subroutine of the present invention will be explained below with reference to FIG.

In step S31, the state of the fixed contact FRD of the manual switch MANU is determined. And fixed contact FR
If D is ON (mode ■), step S3
Proceed to step 6. Further, when the fixed contact FRD is in the OFF state (mode 1 or mode ■), the process advances to step S32.

In step S32, the state of the fixed contact REV of the manual switch MANU is determined. And the fixed contact RE
If V is in the ON state (mode ■), step 33
Proceed to step 3. Further, if the fixed contact REV is in the OFF state (mode ■), the process advances to step 33B.

In step S33, the state of the fixed contact FRD of the manual switch MANU is determined. And fixed contact FR
If D is in the ON state (both fixed contacts FRD and REV are in the ON state, that is, the manual switch MANU has failed), the process advances to step S35. In addition, fixed contact FRD
is in the OFF state (mode ■), step 33
Proceed to step 4.

In step S34, the motor 208 is energized to move the vehicle seat 1 backward. That is, the output port P20 of the microcomputer 403 is set to L'', and the output port P21 is set to H''.

In step S35, the power supply to the motor 208 is stopped,
Processing is performed to make the vehicle seat 1 stand still.

That is, the output port P of the microcomputer 403
20 and 21 are both set to the state of "1(").

In step S36, the state of the fixed contact REV of the manual switch MANU is determined. And the fixed contact RE
If V is in the ON state (both the fixed contacts FRD and REV are in the ON state, that is, the manual switch MANU is malfunctioning), the process advances to step S35. Further, if the fixed contact REV is in the OFF state (mode ■), step S37
Proceed to.

In step S37, the motor 208 is energized to move the vehicle seat 1 forward. That is, the output port P20 of the microcomputer 403 is set to "H" and the output port P21 is set to "L".

In step 338, processing is performed to return to the called main routine.

As mentioned above, the manual subroutine consists of manual switch MANU's tA production LQ (mode ■
~Mode ■) The process of moving the vehicle seat 1 forward or backward is performed. Note that the vehicle seat 1 that has started moving in the manual subroutine continues to move in one direction (rear side or front side) until the process of step S7 of the main routine is executed.

The return subroutine of the present invention will be described below with reference to FIG.

The litter subroutine uses a temporary stop flag SPMF. The temporary stop flag SPMF is a flag that is set when the voltage 1B of the battery 401 becomes less than the set voltage Br or when the shift position switch SPS is turned off.

In step S41, the current seat position CP and the optimum position CM are compared. Current seat position cP and optimal position CM
When they are equal, the process advances to step S54. Further, when the current seat position CP and the optimum position CM are not equal, the process advances to step S42.

In step S42, a return completion flag RET is reset to avoid duplicate calls of the return subroutine.

(Step 543) In step S43, the battery voltage 10B is set to the set voltage Br.
Determine whether the value is less than or equal to the value. Battery voltage 10B
becomes less than the set voltage Br, the electronic control device E
Determining that there is a possibility that the CU may malfunction, proceed to step 3.
Proceed to step 45. Also, the battery voltage 10B is the set voltage Br
If this is the case, the process advances to step S44.

(Step 544) In step S44, the shift position switch SPS
determine the state of When the shift position switch SPS is ON, the process advances to step S50. In addition, when the shift position switch SPS is OFF, it is determined that there is a possibility that the vehicle will start, and step S
Proceed to step 45.

(Steps 345 to 549) Steps 345 to S49 are processes for temporarily stopping the forward movement of the vehicle seat 1 and determining whether or not the abnormality has continued for 5 seconds.

In step S45, it is determined whether the temporary stop flag SPMF is set. Temporary stop flag SP
If MF is set, it is determined that the abnormality continues for m, and the process proceeds to step 34B. Further, if the temporary stop flag SPMF is not set, the process advances to step 346.

In step 346, a temporary stop flag SPMF is set, and the occurrence of an abnormality (that the voltage 10B of the battery 401 has become lower than the set voltage Br, or that the shift position switch SPS has been turned OFF) is stored.

In step 347, a 5-second timer is started, and the process proceeds to step S57.

In step 34B, it is determined whether the 5 second timer has completed its operation. If the 5-second timer is running and has completed its operation, it is determined that the abnormality has continued for 5 seconds, and the process proceeds to step 349. Furthermore, if the 5-second timer has not completed its operation, the process advances to step S56.

In step S49, the temporary stop flag SPMF is reset. After that, the process advances to step S55.

In step 350, the temporary stop flag SPMF is reset.

In step S51, the state of the brake switch BR3 is determined. When the state of the brake switch l3R3 is OFF, the process proceeds to step S52, and processing for moving the vehicle seat 1 forward is performed. Also, brake switch BR3
When the state is ON, the process advances to step S54,
Performs processing to end the operation of the return subroutine.

In step S52, the motor 208 is energized to move the vehicle seat 1 forward. That is, the output port P20 of the microcomputer 403 is set to 11'', and the output port P21 is set to "L".

In step S53, the pulse interval and number of pulses of the pulse signal output from the seat position sensor PS are determined. In other words, ■ determine whether the pulse interval of the pulse signal output from the seat position sensor PS is longer than a preset predetermined time, and ■ determine whether the pulse signal is removed if the pulse interval is longer than the predetermined time. In step S5, it is determined that the vehicle seat 1 is not moving forward at a normal speed.
Proceed to step 4. If the pulse interval is shorter than the predetermined time, the process of counting the number of pulses of the pulse signal (additional count) and setting the seat position CP of the vehicle seat 1 is performed, and the process proceeds to step S57.

In step 354, a return completion flag RET is set to avoid duplicate calls of the return subroutine.

In step S55, the return mode flag RTMF is reset.

In step S56, the power supply to the motor 208 is stopped,
Processing is performed to make the vehicle seat 1 stand still.

That is, the output port P of the microcomputer 403
20 and 21 are both set to the "H" state.

In step S57, processing for returning to the called main routine is performed.

As described above, in the return subroutine, the motor 20 is operated until the seat position CP becomes equal to the optimum position CM.
8 to move the vehicle seat l forward.

In addition, even if the vehicle seat l has not advanced to the optimum position CM, when the voltage element B of the battery 401 becomes less than the set voltage Br while the vehicle seat 1 is moving forward (if the engine is started) etc.) and ■Shift position switch S
When the PS is turned off (such as when the vehicle is ready to start), the forward movement of the vehicle seat l is temporarily stopped.

Then, when the voltage terminal B of the battery 401 becomes abnormal within 5 seconds or when the shift position switch S
If the PS is turned on within 5 seconds, the forward movement of the vehicle seat is resumed.

Furthermore, even if the vehicle seat l has not moved forward to the optimum position CM, the voltage element B of the battery 401 is set to the set voltage Br.
1 for 5 seconds! If the shift position switch SP
If S remains OFF for 5 seconds (e.g. when the vehicle is running), ■Brake switch BR3 turns OFF.
N, and (2) If the pulse signal from the seat position sensor PS is interrupted, the power supply to the motor 208 is stopped, the vehicle seat 1 is made stationary, and the process of the return subroutine is completed.

Next, the away subroutine of the present invention will be explained with reference to FIG.

In the away subroutine, away start flag A
STF is used. Away start flag ASTF
is a flag that is set when the vehicle seat l starts moving backward by a predetermined distance N.

(Steps 361 to 564) The processes in steps 361 to 364 initialize the relay circuit 408 and bring the drive circuit 404 into an operable state.

In step S61, the away start flag ASTF
It is determined whether the has been reset. If the away start flag ASTF is reset, it is determined that the vehicle seat 1 is stationary, and
Proceed to step 362. If the away start flag ASTF is set, it is determined that the vehicle seat l is moving backward, and the process proceeds to step S64.

In step 362, processing is performed to set the state of the output port P22 of the microcomputer 403 to mH*. That is, the relay circuit 408 is brought into a connected state (the relay circuit 408 connects the battery 401 and the drive circuit 404), and the drive circuit 404 is set to an operable state.

In step S63, the away start flag ASTF
Set.

In step S64, processing is performed to set the state of the output port P22 of the microcomputer 403 to "L".

However, since relay circuit 408 has a self-holding function, drive circuit 404 is maintained in an operable state.

In step S65, the current seat position CP is referred to,
It is determined whether the vehicle seat 1 has completed backward movement by a predetermined distance N from the optimal position CM. When the vehicle seat l has completed backward movement by the predetermined distance N from the optimal position CM, the process advances to step S79. Further, if the vehicle seat l has not yet completed backward movement by the predetermined pressure #N, the process proceeds to step 566.

In step 366, the state of the rear most detection switch RM is determined. Rearmost detection switch RM is OFF
In the state of , the process advances to step S67. When the rear most detection switch RM7')<ON, the vehicle seat 1 has already moved by the maximum backward movement distance and cannot move backward anymore, so the process advances to step S79.

In step S67, the away completion flag AWAY is reset to avoid duplicate calling of the away subroutine.

(Step 868) In step 368, battery voltage element B is set to set voltage Br.
Determine whether the value is less than or equal to the value. Battery voltage element B
becomes less than the set voltage Br, the electronic control device E
It is determined that there is a possibility that the CU may malfunction, and step S
Proceed to 71. Also, battery voltage element B is set voltage Br
If so, proceed to step 370.

(Step 569) In step S69, the shift position switch SPS
determine the state of If the shift position switch SPS is ON, the process advances to step S76. In addition, when the shift position switch SPS is OFF, it is determined that there is a possibility that the vehicle will start, and step 3
Proceed to 71.

(Steps 570 to 574) Steps 370 to S74 are processes for temporarily stopping the backward movement of the vehicle seat 1 and determining whether the abnormality has continued for 5 seconds.

In step S70, it is determined whether the temporary stop flag SPMF is set. Temporary stop flag SP
If the MF is set, the process advances to step S73, and if the temporary stop flag SPMF is not set, the process advances to step 371.

In step 371, a temporary stop flag SPMP is set, and the occurrence of an abnormality (voltage B of the battery 401 being lower than the set voltage Br, or shift position switch SPS being turned OFF) is stored.

In step S72, a 5-second timer is started, and the process proceeds to step S83.

In step S73, it is determined whether the 5-second timer has completed its operation. If the 5-second timer has completed its operation, it is determined that the abnormality has continued for 5 seconds, and the process proceeds to step S74 to complete the away operation. If the 5-second timer has not completed its operation, the process advances to step S81 and the paused state continues.

In step S74, the temporary stop flag SPMF is reset. After that, the process advances to step S80.

In step 375, the temporary stop flag SPMF is reset.

In step S76, the state of the brake switch BR3 is determined. When the state of the brake switch BR3 is OFF, the process proceeds to step S77, and processing for moving the vehicle seat 1 backward is performed. Further, when the state of the brake switch BR3 is ON, the process proceeds to step S81, and processing for temporarily stopping the away operation is performed.

In step S77, the motor 208 is energized to move the vehicle seat 1 backward. That is, microcomputer 4
The output port P20 of 03 is set to "L" and the output port P21 is set to "H".

In step 37B, the pulse interval and number of pulses of the pulse signal output from the seat position sensor PS are determined. In other words, ■ determine whether the pulse interval of the pulse signal output from the seat position sensor PS is longer than a preset predetermined time, and ■ determine whether the pulse signal is removed if the pulse interval is longer than the predetermined time. In step S8, it is determined that the vehicle seat 1 is not moving backward at a normal speed.
Go to 0. If the pulse interval is shorter than the predetermined time, the process of counting the number of pulses of the pulse signal (subtraction count) and setting the seat position CP of the on-vehicle seat 1 is performed, and the process proceeds to step S83.

In step S79, an away completion flag AWAY is set to avoid duplicate calling of the away subroutine.

In step S80, the away mode flag AWMF is reset.

In step S81, the power supply to the motor 208 is stopped,
Processing is performed to make the vehicle seat 1 stand still.

That is, the output of the microcomputer 403)P
Both 2O and 21 are set to the "H" state.

In step S82, the away start flag ASTF
Reset.

In step 383, processing is performed to return to the called main routine.

As described above, in the away subroutine, the relay circuit 40B is controlled and a predetermined distance MN from the seat position CP is
Then, the process of moving the vehicle seat 1 backward is performed.

In addition, even if the onboard seat) 1 has not moved backward by the predetermined distance N, if the voltage element B of the battery 401 becomes less than the set voltage Br (when the engine is started) while the onboard seat 1 is moving backward. case, etc.), ■Shift position switch SP
When S is turned OFF (such as when the vehicle is ready to start), ■When the brake switch BR3 is turned ON, the backward movement of the vehicle seat 1 is temporarily stopped.

If the voltage element B of the battery 401 becomes equal to or higher than the set voltage Br within 5 seconds, if the shift position switch SPS is turned ON within 5 seconds, or if the brake switch BR3 is turned OFF, the Resuming backward movement of upper seat 1.

Furthermore, even if the vehicle seat 1 has not moved backward by the predetermined distance N, ■ If the voltage terminal B of the battery 401 continues to be lower than the set voltage Br for 5 seconds (the battery 401
1), ■ If the shift position switch SPS remains OFF for 5 seconds (such as when the vehicle is running), and ■ If the pulse signal from the seat position sensor PS is interrupted. Then, the power supply to the motor 208 is stopped, the vehicle seat 1 is made to stand still, and the process of the away subroutine is completed.

As described above, the vehicle seat 1 of this embodiment moves backward by a predetermined distance N upon detecting the occupant's disembarkation motion, and moves forward to the optimal position CM upon detecting the occupant's completion of getting on the seat. Therefore, when the occupant gets off the vehicle, the space under the feet is expanded to assist the occupant in getting off the vehicle, and when the occupant gets on the vehicle, the on-vehicle seat l is returned to the optimum position CM to improve riding comfort for the occupant.

In this embodiment, only an example in which the vehicle seat 1 of the present invention is used as a driver's seat is shown, but it goes without saying that the present invention can be used in the same manner as a passenger seat or other seats.

〔Effect of the invention〕

The present invention provides: a seat disposed on a vehicle; a motor fixed to the seat; a seat forward/reverse drive mechanism that transmits the driving force of the motor to the vehicle body to move the seat forward or backward;
Motor drive means for supplying electric power to the motor; Vehicle state detection means for detecting that an occupant can get on and off the vehicle; Electronic control means for controlling the motor drive means in accordance with the output of the vehicle state detection means. It is an in-vehicle seat equipped with;

Therefore, the vehicle seat of the present invention moves forward and backward based on the condition of the occupant detected by the vehicle condition detection means. Therefore, the on-vehicle seat can be moved only when the occupant gets into or out of the vehicle, and the on-vehicle seat can be configured with low power consumption (and no unnecessary movements).

[Brief explanation of the drawing]

FIG. 1 is a perspective view depicting a vehicle seat according to the present invention. FIG. 2 is a perspective view depicting a base frame for fixing the seat SE to the floor surface of the vehicle interior. FIG. 3 is a sectional view of the vehicle seat of the present invention. FIG. 4 is a block diagram depicting the circuit configuration of the electronic control device of the present invention. FIG. 5 is a flowchart depicting the main routine of the electronic control device of the present invention. FIG. 6 is a flowchart depicting a manual subroutine of the electronic control device of the present invention. FIG. 7 is a flowchart depicting a return subroutine of the electronic control device of the present invention. FIG. 8 is a flowchart depicting the away subroutine of the electronic control device of the present invention. FIG. 9 is an equivalent circuit diagram of relay circuit 408 of the present invention. 1... Vehicle seat 200... Seat forward/backward movement drive mechanism (seat forward/backward movement drive mechanism) 201... Lower rail 202... Upper rail 203, 204, 205... Frame 206... Threaded rod 207...Female screw portion 208...Motor (motor) 209...Deceleration mechanism 210.212.213...Connector 211...Protrusion 401...Battery 402...Constant voltage power supply circuit 403. ...Microcomputer (electronic control means, forward control means, reverse control means, forward return means, constant distance backward control means) P1 to PIO...Input ports P21-P22...Output boat 404...Motor drive circuit (Motor drive means) 405
...Signal input circuit 406...Seat position input circuit 407...Manual switch input circuit 408...
Relay circuit (safety device) 409...Low voltage detection circuit 901.903.907...Noah gate 902...
Differential circuit 904...RS flip-flop 905...AND gate 906...Inverting circuit 908...Power transistor BP...Brake pedal IOC...Ignition key cylinder SR...
- Seat (seat) SEB... Seat pack 1G... Ignition switch (ignition key cylinder state detection means, vehicle state detection means) ACC... Accessory switch (ignition key cylinder state detection means, vehicle state detection means UW) ...Key position switch (ignition key cylinder state detection means, vehicle state detection means) SPS...Shift position switch (gear stage detection means, safety device) BRS...Brake switch (safety device) RM...
Rearmost detection switch (maximum reverse distance setting means) MANU...Manual switch (forward switch means, reverse switch means) FRD, REV...Fixed contact COM...Movable contact PS...Seat position sensor ECU... Electronic control device step S9... Return position setting means T1 to T8... Terminal

Claims (16)

[Claims] (1) A seat disposed on a vehicle; A motor fixed to the seat; Transmits the driving force of the motor to the vehicle body to move the seat forward;
or a seat forward/reverse drive mechanism for moving the seat backward; a motor drive means for supplying electric power to the motor; and a vehicle state detection means for detecting that the occupant is ready to get on or off the vehicle; An on-vehicle seat comprising: electronic control means for controlling the motor drive means; (2) The electronic control means further includes: a forward switch means for advancing the seat in response to an operation by an occupant; a forward control means for advancing the seat when the forward switch means is operated; and an operation by the occupant. 1. A vehicle according to claim 1, further comprising: a reverse switch means for moving the seat backward by a reverse switch; and a reverse control means for moving the seat backward when the reverse switch means is operated. Car seat. (3) The vehicle seat according to claim 2, wherein the backward movement control means includes a maximum backward movement distance setting means for setting a maximum backward movement distance of the seat. (4) The vehicle state detection means includes: a gear position detection means for detecting a gear position of a vehicle transmission; an ignition key cylinder state detection means for detecting a state of an ignition key cylinder of the vehicle; Claim 1, characterized in that a change in the state of at least one of the detection means and the ignition key cylinder state detection means is detected.
The vehicle seat described in section. (5) The gear position detection means includes a shift position switch, and detects whether the gear position of the vehicle transmission is either neutral or parking. The vehicle seat described in Scope 4. (6) The ignition key cylinder state detection means includes an accessory switch built into the ignition key cylinder, and detects the state of a contact of the accessory switch. Car seats listed. (7) The ignition key cylinder state detection means includes a key position switch that detects that the ignition key is inserted into the ignition key cylinder, and detects the state of a contact of the key position switch. The vehicle seat according to claim 4. (8) The electronic control means further includes: return position setting means for setting the return position of the seat; forward return control means for advancing the seat to the return position; and moving the seat backward by a predetermined travel distance. The vehicle seat according to claim 1, further comprising: fixed distance backward movement control means; and; (9) The vehicle seat according to claim 8, wherein the fixed distance backward movement control means includes maximum backward movement distance setting means for setting the maximum backward movement distance of the seat. (10) The vehicle seat according to claim 1, wherein the electronic control means includes a safety device for canceling the operation of the motor drive means. (11) The safety device includes a gear position detection means for detecting the gear position of the vehicle transmission, and operates upon detecting that the gear position of the vehicle transmission is at least neither neutral nor parking. The vehicle seat according to claim 10, characterized in that: (12) The safety device further includes a first timer means, which operates when a predetermined period of time has elapsed after detecting that the gear position of the vehicle transmission is neither neutral nor parking. The vehicle seat according to claim 11, characterized by: (13) A patent characterized in that the safety device includes a brake switch that operates according to the operation of the brake pedal of the vehicle, and the safety device operates upon detecting that the brake pedal is depressed. The vehicle seat according to claim 10. (14) The safety device includes self-holding means,
The vehicle seat according to claim 13, wherein the vehicle seat is not released even if the brake pedal is no longer depressed after detecting that the brake pedal is depressed. (15) The safety device includes a seat movement speed detection means for detecting the movement speed of the seat, and the safety device operates when the movement speed of the seat becomes equal to or less than a predetermined speed. The vehicle seat according to claim 10. (16) The safety device includes: second timer means; reduced voltage detection means for detecting that the voltage supplied to the electronic control means has become less than a predetermined value; 11. The vehicle seat according to claim 10, which operates when the detected voltage continues to be lower than the minimum voltage for a predetermined period of time.