JPS644939B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a seat position control device that drives a seat on a vehicle forward and backward in response to a position change instruction from a command switch, and in particular, This invention relates to a position control device for a driver seat and a passenger seat next to the driver seat.

(Prior Art) Vehicle seats that automatically move the vehicle seat to the desired position of the occupant have already been proposed. Publication number 50-34811, Publication number 53-37378
Publication No. 55-26171, etc.).

For example, according to the driver seat disclosed in JP-A-56-138024, once the optimum posture is stored in the electronic control device, the seat can be automatically set to the optimum posture by one-touch key operation. Fine adjustments to the seat posture can also be made with key operations.

On the other hand, when getting on or off the vehicle, the seat is preferably moved backwards, and once the driver is seated, it is preferable to move the seat forward to the driving position. Further, it is preferable to move the driver's seat and the passenger's seat forward and bend the seat back forward to facilitate seating in the rear seat, and when a person is seated in the rear seat, move the driver's seat and the passenger's seat back to the front. Therefore, it has also been proposed to automatically drive the seat using electrical control in response to the operations of a reverse command switch, a return to original position command switch, a door opening/closing detection switch, a handbrake switch, etc. (For example, in addition to the above-mentioned Utility Model Publication No. 53-37378, Utility Model Publication No. 55-26171, and JP-A-56-138024, the new JP-A-58-61027).

(Problem to be Solved by the Invention) Incidentally, although the frequency of changing the seat position as described above is relatively low, in situations where there is a possibility of a seat drive command, it is possible to automatically move the seat in response to the operations of various switches as described above. In order to drive, the seat drive control device is powered on. In other words, the constant voltage circuit that provides the operating voltage to the seat drive control device is connected to the power supply line of the battery, which is the onboard power supply, and is therefore in a standby state where the seat is not driven (waiting for the operation of the various switches mentioned above). ), the constant voltage circuit and seat drive control device also consume power. Power consumption in such a standby state from when the driver gets in the car to when the driver gets out of the car is consumed by the constant voltage circuit and the seat drive control device (for example, the electronic control device in the above-mentioned Japanese Patent Application Laid-Open No. 138024/1983) while the seat is being driven. This is significantly more power compared to the amount of electricity used.

An object of the present invention is to reduce the above-mentioned power consumption in a standby state where sheet driving is not required.

[Structure of the invention]

(Means for Solving the Problems) A vehicle seat position control device of the present invention includes a forward and backward drive mechanism including an electric motor that drives a seat on a vehicle back and forth; A motor driver that energizes the motor in forward and reverse directions; A command switch means that instructs the seat position change; A self-holding signal is generated in response to the command of the command switch means; Motor drive control means for instructing rotational energization of the electric motor and erasing the self-holding signal after the end of rotational energization of the electric motor; a constant voltage circuit that provides an operating voltage to the motor drive control means; the constant voltage circuit switching means inserted in a power line between the command switch means and the power source; power supply means for turning on the switching means in response to a change of the command switch means from a non-instruction state to a position change command state; and self-holding means responsive to a self-holding signal and maintaining said switching means conductive during the presence of said self-holding signal;

(Operation) When the command switching means changes from the non-instruction state to the position change instruction state, the power supply means makes the switching means inserted in the power line between the constant voltage circuit and the power source conductive.

This causes the constant voltage circuit to apply an operating voltage to the motor drive control means. The motor drive control means to which the operating voltage is applied generates a self-holding signal in response to the position change instruction state of the command switching means, and the self-holding means maintains the switching means in conduction in response to the self-holding signal. do. The motor drive control means also instructs the motor driver to rotate the electric motor of the forward/reverse drive mechanism in response to the position change instruction state of the command switch means. The motor driver rotates the electric motor in response to this instruction, and the seat moves. The motor drive control means further erases the self-holding signal after termination of rotational energization of the electric motor. In response, the self-holding means makes the switching means non-conductive, so the constant voltage circuit is cut off from the power supply, the operating voltage to the motor drive control means disappears, and the power consumption of the constant voltage circuit and the motor drive control means is reduced. disappears.

In this way, when the command switch means for instructing the position change of the seat enters the position change instruction state, voltage is applied to the constant voltage circuit and the motor drive control means, so that the motor drive control means responds to the position change instruction. After driving the seat, the voltage to the constant voltage circuit and motor drive control means is cut off, so the constant voltage circuit and motor drive control means consume power only when the seat position needs to be changed. does not consume power when it is not needed. Power consumption is therefore reduced.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

(Embodiment) FIG. 1 shows a vehicle driver seat to which an embodiment of the present invention is applied. In FIG. 1, 10 is a driver seat, which is composed of a seat 11 and a seat back 12 that is rotatable relative to the seat 11.
An operation board 13 is fixed to the seat 11,
It is always covered. PS is the first switch 1
The PR is a push button/rotation type switch that incorporates one of the first switches and the second switch.

When the driver seat 10 is in the sitting position as shown in FIGS. 1 and 2 (solid lines), when the switch PR and PS push buttons are pressed, the first switch is closed and the electric control device described below The seat 11 moves forward due to the drive bias of the seat back 12.
leans forward into the walk-in position shown by the dotted line in Figure 2. When the driver seat 10 is in this walk-in position, if the knob of the switch PR is turned counterclockwise (FIG. 1), it returns to the seated position (solid line in FIGS. 1 and 2).

The outline of the posture setting mechanism attached to the seat 11 and the seat back 12 is shown in Fig. 3a (side view of the entire interior of the seat) and Fig. 3b (seat base 11).
(interior plan view) and Fig. 3c (seat back 1
2) is a front view of the inside as seen from the handle side.
In this example, the posture setting mechanism includes a seat forward/backward drive mechanism 100 that slides the seat base supporting the seat 11 back and forth with respect to a base frame fixed to the floor of the vehicle, and a seat height adjustment mechanism that drives the seat base up and down. A mechanism 300, a seat back tilting mechanism 200 that adjusts the inclination of the seat back frame pivotally connected to the seat base, a seat back cushion changing mechanism 400 that adjusts the seat back spring, a head rest height adjustment mechanism 500 that drives the head rest HR up and down, and a head rest. There are six sets of headrest longitudinal adjustment mechanisms 600 that drive the HR forward and backward. 14 in Figure 3a
(two front and rear) are base frames fixed to the floor, and each of these has a lower rail 15 (two front and rear).
pieces) are fixed. Upper races 16 (two on the front and rear) are slidably mounted on the lower rails 15, respectively. Two arms are fixed to one of the upper rails 16, two arms are fixed to the other upper rail 16, and one threaded rod is fixed to the arm fixed to one of the rails 16. Another threaded rod is held fixed to an arm fixed to another of the rails 16. Two nut units, each of which is fixed to the base frame, are screwed onto these two threaded rods. The nut unit has two nuts each having a threaded hole formed therein and teeth cut on the outer periphery, and two worm gears that are threaded into each of these nuts, and these worm gears are connected by a flexible shaft. has been done. In the nut unit, a bevel gear is fixed to the shaft of the worm gear, and a bevel gear fixed to the shaft of the motor M1 meshes with it.
These nut units are each fixed to the base frame 14, so when the motor M1 is energized to rotate, the inner shaft of the flexible shaft rotates, the worm gear rotates, and the two nuts that mesh with them rotate.
Two nuts are rotated, and two threaded rods are thereby fed out from two nut units. Since the two threaded rods are fixed to the two upper rails 16 via the aforementioned arms (four pieces), the upper rails 16 move. That is, when the motor M1 is energized in the forward and reverse directions, the upper rail 16 slides relative to the lower rail 15 and moves forward and backward. The seat height adjustment mechanism 300 includes a nut unit 31 having the same configuration as the nut unit described above.
0, motor M3, link arm 340 integrally secured to rods 330, 330 integrally secured to swing arms 320, 320, and link arm 3
40 and to which a seat base (not shown) is fixed. When the motor M3 is driven in the forward and reverse directions, the nut unit 31
0 moves back and forth along the threaded rod, thereby causing the rod 330 and link arm 340 to rotate clockwise and counterclockwise, and the base arm 350 to move up and down.

The seatback tilting mechanism 200 is roughly similar to the seat forward/reverse drive mechanism 100 described above, and is composed of a nut unit and a motor M2, and rotates the seatback 12 clockwise and counterclockwise by forward and reverse rotation of the motor M2. I try to do that. In the seat back 12, as shown in FIGS. 3c and 3a, the torsion spring 1
The force of 2a is transferred to the seat back cushion changing mechanism 40.
I try to adjust it to 0. That is, a nut unit 410 is screwed onto a threaded rod ₁₈₄ fixed to the seat back frame 12b, and one end of the torsion spring 12a is coupled to an inclined surface of an inclined cam plate 411 fixed to the nut unit. By driving the motor M4 forward and backward, the nut unit 410 moves up and down, and the lumbar plate 12c connected to the other end of the torsion spring 12a advances and retreats.

Rods supporting headrest HR 501 ₁ , 501 ₂
A base plate 502 that supports the height adjustment mechanism 500 is fixed to the lower end of the base plate 50.
A nut unit 503 and a motor M5 are fixed to 2. The nut unit 503 is screwed onto a threaded rod 504 fixed to the seatback frame, and the nut unit 503 moves up and down as the motor M5 moves forward and backward, and the rods 501 ₁ and 501 ₂ move up and down.

Rods supporting headrest HF 501 ₁ , 501 ₂
The headrest HR is mounted so as to be movable in the forward and backward directions, and a nut unit similar to that described above is combined with a threaded rod so that the headrest HR can be moved forward and backward by forward and reverse rotation of the motor M6.

In addition, each of the motors M1 to M6 responds to forward and reverse instructions from the microprocessor CPU3.
Motor driver MDR energizes forward and reverse directions. Each of the motors M1 to M6 is coupled to a rotary encoder S1 to S6, respectively.

FIG. 4 shows an embodiment of the present invention installed in the driver seat 10. As shown in FIG. In Figure 4, 1
3 is an input operation board, which includes six up instruction switches SWM1 _u to SWM6 _u , six down instruction switches SWM1 _D to SWM6 _D , three seating instruction switches SWN1 to SWN3, a memory instruction switch SK, 1-digit 7-segment display, decoder driver for display activation, vehicle speed zero detection circuit SDC, door opening/closing detection circuit DDC, ignition switch opening/closing detection circuit IDC, input/output port I/O, microprocessor CPU1, ROM1,
, RAM1, and transmitting/receiving transistors.

The main control operations of the microprocessor CPU 1 are to read changes in the open/close states of the various switches mentioned above, and to read the switch codes and status codes that have changed when the changes occur.
Transmission to CPU2 and switch SWN1~
These are the switch display activation (display) when SWN3 is closed and the status indication activation (display) in response to the status display instruction from CPU2, and the programs that perform these operations are CPU1 and
Stored in ROM1.

The part surrounded by the two-dot chain line EOCU in Fig. 4 is the electronic control unit, which includes a microprocessor CPU2 that receives data sent from the CPU1, ROM2 and RAM2 for transmitting and receiving control, and a microprocessor for attitude control. CPU3, ROM3,
Mainly RAM3 and non-volatile NRAM.

Even if DC voltage Vd is applied to EOCU from the power supply line, the external switches SWI _o , SW1, SW2 ₁ ~
When both SW2 ₃ are open, transistors Tr ₁ and Tr ₂ are off (non-conducting), so
Transistor Tr ₃ inserted between the power supply line (Vd) that receives power from a battery (not shown) and the constant voltage circuit CPS is also off, so power is not supplied to the constant voltage circuit CPS, and CPU2, CPU3 and
No operating voltage is applied to RAM2 and RAM3.
However, the battery backup element BBU is always supplied with voltage from the on-board battery via a separate system, so the NRAM memory is always maintained.

The CPU 1 of the operation board 13 turns on (conducts) the transistor Tr ₄ and turns on the phototransistor of the EOCU.
When Tr ₅ turns on or an external switch
When any one of SWI _o , SW1, VW2 ₁ to SW2 ₃ is closed, the base of transistor Tr ₁ becomes the ground level, so Tr ₁ turns on, which turns on Tr ₂ and turns on Tr ₃ . turns on, voltage Vd is applied to the constant voltage circuit CPS, and the constant voltage circuit
The CPS applies a predetermined voltage to each element in the EOCU.
As a result, the CPU2 and the CPU3 each operate, setting the output to a high level "1" to the OR gate OR1, and turning on the transistor _Tr6 .

Turning on Tr ₆ brings the base of Tr ₁ to ground level, so Tr ₃ is kept on (power supply self-holding). When the CPU2 and CPU3 complete their predetermined operations, they reset the "1" output to the OR gate OR1 (set it to a low level "0").

Therefore, when a given instruction is given, the EOCU
is activated, and after CPU2 and CPU3 perform predetermined operations, the power to the EOCU is automatically shut off.

The operating programs for the microprocessors CPU2 and CPU3 include I/O pulses of a predetermined period and a predetermined pulse width when they are operating normally.
Microcomputer monitoring circuit ERD1 and ERD from port
A timing program is built in to output to microcontroller monitoring circuits ERD1 and ERD2.
outputs a signal indicating an abnormality when the period and/or pulse width of the input pulse becomes larger than a predetermined value.
Such microprocessor abnormality detection methods and monitoring circuits are known, and in conventional microprocessor abnormality protection, a microprocessor in which an abnormality has occurred is powered off, initialized, or reset. However, in this embodiment, if one of the microprocessors goes out of control, the outputs of the microcomputer monitoring circuits RED1 and ERD2 are applied to the negative logic OR gate OR2 (NAND gate), transistor _Tr7 is made conductive, and both CPU2 and CPU3 are reset. That's what I do.
Therefore, if one of CPU2 and CPU3 goes out of control, both CPU2 and CPU3 are reset and all input/output ports I/O are initialized.

The external switch SWI _o has a total mechanism of 100 to 600
In this embodiment, closing SWI _o causes the motors M1 to M6 to rotate in the forward direction, stop at the limit position in the normal rotation direction, and set the motors at the current position after stopping at the limit position. Instructs to clear register m0. The forward rotation of the motor M1 moves the seat 10 forward, the forward rotation of the motor M2 tilts the seat back forward, the forward rotation of the motor M3 lowers the seat, and the forward rotation of the motor M4 reduces the lumbar pressing force of the spring 12a. When the motor M5 rotates forward, the headrest HR lowers, and when the motor M6 rotates forward, the headrest HR moves backward. In addition, switch M1 _D ~
Closing of _M6D instructs the motors M1 to M6 to rotate in the normal direction, and closing of the switches _M1U to _M6U instructs the motors M1 to M6 to rotate in the reverse direction, respectively. Motor M1~
While rotating each of M6, CPU3 rotates the rotary encoder S1 coupled to each.
~The output pulse of S6 is monitored, and when the pulse cycle of the rotary encoder exceeds a predetermined value, it is assumed that the motor is overloaded (in the case of reaching the limit position, in the case of sheet jamming or abnormality in each mechanism), and the motor is stopped. do. The SWI _o consists of an open/close switch PSC, which is attached to the side cover as shown in Figure 1 and is always protected by a lid that cannot be opened easily. This switch PSC means SWI _o
When the vehicle leaves the factory or when the vehicle is delivered to the store,
It will be closed by someone who knows how to use this switch SWI _o . At this time, the place where each mechanism stops is the limit position which is the position origin, and the contents of the current position register m0 (all 6 sets of position data from 100 to 600) are cleared to zero indicating the origin. Note that the current position register m0 is NRAM
The content is assigned to the constant voltage circuit
It does not disappear even if CPS is deactivated.

The printed circuit board containing the electronic control unit EOCU is housed in a steel case SCA. As clearly shown in Figures 5a and 5b, four mild steel strips (hot-rolled steel plates cut into strips) FSB1 to FSB4 are fixed to this steel case by welding. The free ends of FSB1-FSB4 are tied to seatback springs BS1 and BS2, as shown in Figures 3c and 5a. As a result, the steel case SCA housing the electronic control unit EOCU is located between the back plate of the seat bag 12 and the springs BS1 and BS2.

As described later, external switches SW2 ₁ to SW2 ₃
is attached to the seat back, and since the motors M4 to M6 are fixed or supported by the seat back as described above, by attaching the steel case to the seat back 12 as described above, the electronic control unit EOCU and the seat base 11 can be connected. The number of wiring lines between the seats is extremely reduced, and the difficulty of wiring caused by the relative tilting of the seat back 12 with respect to the seat base 11 is greatly reduced. Furthermore, all the electrical elements shown in FIG. Equipment is becoming easier.

Fig. 6a shows an enlarged plane of the push button/rotating type switch PR shown in Figs. 1 and 2.
The figure shows a plane with the lid 21 removed, and FIG. 6c shows a cross section. Two openings 21 and 22 are opened at the bottom of the lid 21, and the housing base 2 is inserted into the opening 21.
A switch SW2 ₃ and a pin 24 fixed to the base 23 protrude from the opening 22, and a pin 25 fixed to the base 23 protrudes from the opening 22. A center shaft 26 that protrudes from the base 23 passes through the hole at the center of the circle of the lid 21, and a ring 27 bites into the center shaft 26 and closes the lid 2.
Prevents omission of 0. Two switches SW2 ₁ and SW2 ₂ are fixed inside the lid 20.
Although not shown, these leads are drawn out through the opening 21 and the base 23.
Two pins 28 and 29 are set at the bottom of the lid 20, and a tension coil spring 32 is fixed to the pins 24 and 28. The spring 32 applies a clockwise force to the lid 20, but the clockwise rotation of the lid 20 is prevented at the position where the edge of the opening 22 contacts the pin 25. The switch operating cap 31 is connected to the lid 20 with the compression coil spring 30 being compressed. With the above configuration, the switch SW2 ₃ (the second switch) is closed by turning the lid 20 counterclockwise, and the switches SW2 ₁ and SW2 ₂ (the first set of the first switch) are closed by pressing the switch operation cap 31. switch) is closed. Closing the switches SW2 ₁ and SW2 ₂ instructs the walk-in posture to be set, and closing SW2 ₃ instructs the sitting posture to be set. Three legs having arrowhead-shaped tips are integrally formed on the housing base 23 of the switch PR, and as shown in FIG. The switch PR is fixed to the seat back 12 by inserting its legs into rectangular holes in the seat frame 34.

Push button switch shown in Figures 1 and 2
A longitudinal section of the PS is shown in Fig. 7a. At the center of the housing base 40 are a first set of switches and a second set of switches.
A switch SW1 is arranged, and this switch SW1 is closed when the operating cap 41 is pressed.

Figure 8a shows the appearance of the passenger seat 10-AS. The push button/rotating type switch PR-AS1 on the side of the passenger door side has almost the same structure as the PR described above, but a tension coil spring 32 is fixed to the pins 25 and 29, and the switch is attached counterclockwise to the lid 20. Turn the switch SW by applying rotational force and rotating the cover 20 clockwise.
3 It differs from PR in that ₃ is closed. Passenger seat 10-AS has a PR on the side on the driver side so that the posture can be set by the driver next to it.
A switch PR-AS2 having exactly the same configuration as the above is installed, and these switches are connected in parallel so as to respond to any switch operation, as shown in Fig. 8d. Other configurations are completely driver seat 10
, so only the driver seat 10 will be described below.

First, an overview of the operation of the CPU 1 will be explained. The microprocessor CPU1 of the input operation board 13 has 16
Key switch SW-M1 _U ~ M6 _U , M1 _D ~ M
6 Monitor the opening/closing of _D , N1 to N3 and SK, as well as the output signals of the vehicle speed zero detection circuit SDC, door opening/closing detection circuit DDC, and ignition switch opening/closing detection circuit IDC, and detect a status change if one of them changes. A code indicating the state and status of the switch or circuit that occurred, as well as their error detection bits, are created to form a transmission data frame, and transistor Tr ₄ is turned on. When transistor Tr ₄ is turned on, phototransistor Tr ₅ of electronic control unit EOCU is turned on, and in EOCU, transistor Tr _{1 is turned} on.
The base of is grounded through transistor Tr ₅ , Tr ₁ , Tr ₂ and Tr ₃ are turned on, voltage Vd is applied to constant voltage circuit CPS, and power is turned on to EOCU.
After that, CPU1 serially sends the data bits of the transmission data frame to transistor _Tr4 ,
CPU2 receives the data.

The CPU 3 applies data such as an abnormality display to the base of the transistor Tr ₈ through the input/output port I/O connected to the CPU 3, and the CPU 1 receives the data and displays a predetermined one-digit 7-segment display.

As described above, the CPU 1 monitors state changes of the key switch and detection circuit, transmits state change data, receives data from the EOCU, and controls the display. Furthermore, when the seated person key switch SWN1 is closed, the number 1 is displayed and energized until a predetermined operation end signal (display reset) signal arrives from the EOCU, and when the SWN2 is closed, the number 2 is displayed.
Also, when SWN3 is closed, the number 3 is displayed and activated.

Next, the operation of the CPU 2 will be explained with reference to FIG.

As mentioned above, when CPU1 turns on transistor _Tr4 , and switches SWI _o , SW1,
When any one of SW2 ₁ to SW2 ₃ is closed, transistors Tr ₁ , Tr ₂ and Tr ₃ are turned on,
The EOCU is powered on. When the power is turned on, the CPU2 first initializes the input/output port I/O as shown in FIG. 9, and then sets a high level "1" to the output port to the OR gate OR1 to turn on the transistor _Tr6 . , set the base of transistor Tr ₁ to arm connection (power self-holding on).
Then initialize the RAM (clear registers) and
Set the second timer (program timer),
Receive serial data from CPU1. In this case, if communication data does not arrive before the 10 second timer times out, the self-holding output "1" to the OR gate OR1 is reset (power self-holding output is turned off) after the time-out. When data arrives, the 10 second timer is set again and the data sent by CPU1 is received. Then the received data is sent to the CPU
Set the 8-bit data line to 3 and the CPU
3 and sends data to CPU3. In addition, timing program data for giving a fixed periodic pulse to the microcomputer monitoring circuit ERD1 is inserted into the receiving operation program of the CPU2.
While the CPU 2 is operating as expected, pulses of a predetermined period are applied to the ERD 1. When CPU2 goes out of control, the period of the pulse becomes longer, and ERD1 applies a reset signal to OR gate OR2 to turn on transistor _Tr7 and reset both CPU2 and CPU3. By resetting, CPU2 and CPU3 return to "I/O port initialization" which is the next step after "start".

The interrupt processing operation of the CPU 3 is shown in FIG. 10a.
When an interrupt is received from CPU2, CPU3 stores the data currently held in the accumulator register.
Transfer the data to RAM, receive data (8-bit parallel) from CPU2, check the data for errors, and if there are no errors, store the received data in the status register, and return the data saved in RAM to the accumulator register. , returns to control based on this data. When an error occurs, an error signal is sent to transistor _Tr8 . When CPU1 receives this error signal, it creates the data again.
Send to CPU2.

As mentioned above, each time there is a change in the state of the key switch and state detection circuit of the operation board 13, the CPU 1 sends data indicating the change to the CPU 2.
Each time the CPU 2 receives the data, it interrupts the CPU 3 and sends the data, and the CPU 3 stores the data in the status register. Therefore, the latest state data is always held in the state register of the CPU 3, and the CPU 3 changes the state data of the 10b according to the contents of the state register and the opening/closing of the external switches SWI _o , SW1, SW2 ₁ to SW2 ₃ . The seat posture control shown in Figs. 10i to 10i is performed.

The seat posture control shown in FIGS. 10b to 10i will be described below. First, Figure 10b and 10
To explain the main flow shown in figure c, CPU3
is when the transistor Tr ₅ of the CPU 1 is turned on by turning on the transistor Tr ₄ , or when the switch SWI _o , SW
When any one of SW2 ₁ to SW2 ₃ is turned on, transistors Tr ₁ , Tr ₂ and Tr ₃ are turned on and power is applied to itself, initializing the input/output port I/O and sending a signal to the OR gate OR1. "1" to the output port
is set, transistor Tr ₆ is turned on, and Tr ₁ is turned on.
hold the base of the unit on the arm (power self-hold output on). During initialization, the output ports for motors M1 to M6 are set to the stop command level, but just to be sure, set the motors M1 to M6 to stop.
Initialize the RAM and set a 10-second timer (program timer). And read the opening and closing of SWI _o ,
``1'' on output port to OR1 when it is closed
Then, reset the 10 second timer (power self-holding output on) and proceed to the origin initialization flow shown in FIG. 10d. Note that when this mechanism origin initialization flow is completed, a flag (initialized flag) indicating that initialization (origin initialization) has been completed is set in NRAM.

If SWI _o is open, CPU3 next checks whether the initialized flag exists, and if it is set,
Read the open/close status of the walk-in instruction switches SW1, _SW21 to _SW23 , and if any of them is closed, turn on the power self-holding (set OR1 to ``1'' and reset the 10 second timer), and proceed as shown in Figure 10e. Moving on to the walk-in control flow shown in . If all walk-in instruction switches are open and the initialized flag is not set, the posture adjustment switch SW-M1 _U is set by referring to the status register.
-M6 and _M1D to _M6D are checked to see if they are closed. If they are closed, power self-holding is set and the process proceeds to the attitude adjustment flow shown in Fig. 10f. If none of the switches are closed, refer to the initialization flag again in the flow shown in Figure 10c,
If this is not set, the process returns to the determination of "Initial SWI _o ON?" in Figure 10b. When the flag is set, the origin initialization has already been completed, so read whether any of the seater instruction key switches SWN1 to N3 are closed from the contents of the status register, and if any of them is closed, the power self- After setting the holding position, the process moves to the posture setting flow corresponding to the seated person, as shown in FIG. 10g. If SWN1 to N3 are all open, the memory set key switch
Whether SW-SK is closed is read from the contents of the status register, and if it is closed, the flow moves to the attitude memory flow shown in FIG. 10h. When SW-SK is open, the driver side door changes state (open → closed or closed → open).
If there is a change in the state of the door, power self-holding is set and the process moves to the getting-on/off-vehicle posture control flow shown in FIG. 10i. If there is no change in the status of the door, check whether the 10 second timer has timed up or not. If the timer has timed up, reset the power self-hold (clear the output to OR1 to "0") and proceed as shown in Figure 10b. Return to the step, and if the time has not expired, return to the step.

In the main routine explained above, CPU3
turns on all switches (SWI _o , SW1, SW2 ₁ ~ 2 ₃ , SW - MI _U ~ M6) for 10 seconds after the power is turned on.
Read the opening/closing of _U , M1 _D ~ M6 _D , N1 ~ N3, SK), and if any switch is closed within 10 seconds,
Reset the power self-hold and perform control operations corresponding to the closed switch.

Next, the origin initialization flow shown in FIG. 10d will be explained. In this case, the CPU 3 first refers to the contents of the status register and reads whether the ignition IG switch and driver door are open or closed, and if the IG switch is closed and the driver door is open (it can be considered safe even if the origin initialization is performed). Therefore, first, specify motor M1 by setting j=1, set a program timer for time T1, and energize motor Mj, J=1, for forward rotation.
Then, wait for the arrival of a pulse from rotary encoder Sj, J = 1, and while the pulse does not arrive, T1
Monitor the time-up of the timer. During this time, the motor M1 rotates forward and the seat moves forward. Every time a pulse arrives from Sj, the CPU 3 resets the T1 timer. When the seat 10 moves forward and reaches the limit position, the mechanical load increases, the rotational speed of the motor M1 decreases, the period of the output pulse of Sj exceeds T1, and the T1 timer times out. When the time is up, the CPU 3 stops the motor Mj, j=1, then sets j=2 and energizes the motor Mj to rotate forward, monitors the output pulse of the rotary encoder Sj=, j=2, and similarly detects that the period is T1 or more. When this happens, motor Mj is stopped in response to the time up of the T1 timer, and then motor Mj is stopped with j=3.
energizes forward rotation. Similarly, when the motor is energized and stopped until j=6, and when Mj, j=6 is stopped, the data (M1 to M6) of the current position register m0 assigned to NRAM, that is, the data of mechanisms 100 to 600 are 6 sets of data indicating each position) are cleared (position 0: indicates the origin),
Place an initialized plug in NRAM. As a result, the seat 10 is in the most advanced position, the seat back 12 is tilted most forward, the lumbar spring is set at its weakest, and the head rest is at its lowest position.
HR occupies the lowest and most advanced position. This posture is the initial position of the seat, that is, the origin position of each mechanism 100 to 600, and the content (0) of the posture data memory m0 indicates this.

In addition, there is a switch that instructs this origin initialization.
The SWI _o is installed as a switch PSC on the side cover as shown in Figure 1, and is always protected by a lid that cannot be opened easily. upon completion)
The facility will be closed by construction personnel or maintenance personnel.

Next, the walk-in control flow shown in FIG. 10e will be explained. In this case, the CPU 3 refers to the opening/closing of the driver door and the zero vehicle speed detection signal from the contents of the status register, and if the driver door is open and the vehicle speed is zero, it activates the walk-in instruction switches SW1 and SW2.
_1. Read which of SW2 ₂ and SW2 ₃ is closed,
If SW1, _{2 1} or 2 ₂ is closed, it is a walk-in posture instruction, so the target value register 6 is cleared (that is, the origin instruction), and the current position data of register m0 is memorized in the original position register m5. In order to set the mechanisms 100 and 200 at the origin position, m0
Motors M1 and M2 move in the direction (forward rotation) where the 100 and 200 position data of m6 become the contents (origin).
Motor overload detection by monitoring the output pulses of rotary encoders S1 and S2 - T1 time limit timer set and reset of motor stop, S1 and S2
2, each time a pulse appears, the position data is updated by subtracting each data of m0 (position 100 and position 200), and the closing of other switches is monitored, and motors M1 and M2 are checked if they are overloaded. When the data of m0 (position 100 and position 200) matches the data of m6 (origin 0), the motor M1 or M2 of the matching mechanism 100 or 200 is stopped, and the other When the switch is closed, both M1 and M2 are immediately stopped. Further, when SW1, _{2 1} or 2 ₂ is once opened and then closed again, both motors M1 and M2 are stopped. This allows SW
When 1, _{2 1} or 2 ₂ are closed once, the seat 10 moves to the walk-in position (seat 11 moves forward, seat back 12
leaning forward). When the switch _SW23 is closed, this instructs to return to the original position, so store the data of the original position register m5 (position data of 100 and position data of 200) in the target value register m6, and proceed as described above. The motors M1 and M2 are energized in the direction in which the contents of m0 match the contents of m6, and when they match, the motors are stopped. In addition, motors M1 to M
6 is energized for forward rotation, the output pulses of rotary encoders S1 to S6 are subtracted and counted.
Update the data of m0 to the subtracted residual value, and
When M6 is reversely energized, the output pulses of S1 to S6 are added and counted, and the data of m0 is updated to the added value. In Figure 10e, m6 ₁ and
m6 ₂ is a mechanism 100 each storing memory in m6
and 200, and m0 ₁ and m0 ₂ mean the current position data of mechanisms 100 and 200, respectively, stored in m0.

Next, the posture adjustment flow shown in FIG. 10f will be explained.

Switch SW-MI _U ~ M6 _U is each motor M
SW-M1 _D to M6 _D instruct the reverse rotation of motors M1 to M6, respectively. CPU3
When any one of SW-M1 _U to M6 _U (j=1 to 6) is closed, motor Mj is reversely energized and encoder Sj is activated while detecting motor overload (timer T1).
Every time a pulse appears, the position data assigned to the mechanism j×100 of m0 is added and updated. And when motor Mj becomes overloaded (T1 time up)
Or the motor Mj is stopped when the switch is opened. When any of the switches SW-M1 _D to M6 _D is closed, the motor is energized to rotate in the normal direction, and the position data is updated by subtraction.

Next, the posture setting flow corresponding to the seated person shown in FIG. 10g will be explained. The CPU 3 first refers to the contents of the status register and determines that the vehicle speed is 0 and the IG switch is closed.The CPU 3 first refers to the contents of the status register and determines that the vehicle speed is 0 and the IG switch is closed. position data) and store it in target value register m6, j=1
~6 is first set as j=1 and the mechanism 100 (motor M
From 1), motor energization control is started to set m0 to m6, and this is performed sequentially from j=2, 3, . . . to j=6. In this case as well, the T1 timer is reset every time the rotary encoder Sj generates a pulse, and when the T1 timer times up, it is determined that the motor Mj is overloaded and the motor Mj is stopped. Furthermore, data m0 _j of m0 is updated every time a pulse appears from rotary encoder Sj.
It is a subtraction when the motor is energized to rotate in the forward direction, and an addition when the motor is energized in the reverse rotation. Furthermore, if another switch is closed while this seated person posture setting flow is being executed, the posture setting is interrupted and all motors are turned off.
If the walk-in control instruction switch is repeatedly closed twice, the motors M1 to M6 are also stopped.

In the seated person posture memory flow shown in FIG. 10h, the CPU 3 first sets a set mode timer (program timer) and presses the numeric key N1.
The process waits for N3 to close, and if any of N1 to N3 is not closed by the time the timer times up, the process returns to the main routine. When SW-N1 is closed
Memorize the current position information of mechanisms 100 to 600 (contents of register m0) in register m1 of NRAM,
When SW-N2 is closed, NRAM register m2
Also, when SW-N3 is closed, the current position data is stored in register m3 of NRAM.

Finally, the attitude control flow when getting on and off the vehicle shown in FIG. 10i will be explained. The CPU 3 reads the state of the IG switch with reference to the state register, and if it is open, it is assumed that the driver is getting in or out of the vehicle, and then it reads the opening and closing of the door. If the door is closed, it is assumed that the driver has entered the vehicle and the original position register m5 is
Store the posture data in target value register m6,
If the door is open, it is assumed that the driver is getting off the vehicle, and the position data of the current position register m0 is written.
Add the sheet evacuation distance C ₀ to the target value register m6
to memory. Note that this seat retracting distance C ₀ is only the retracting distance of the seat (retracting distance of the mechanism 100). Then, only the motor M1 of the mechanism 100 is set to m0
is rotated in the direction of m6, and when m0=m6, switch M1 is stopped. In this flow as well, the motor M1 is stopped when the switch is operated, the motor M1 is stopped when the walk-in instruction switch is repeatedly closed twice, and the motor M1 is also stopped when the motor is overloaded. Furthermore, each time the encoder S1 generates a pulse, the position data of the mechanism 100 of m0 is incremented by 1 (when rotating in reverse) or decremented by 1 (when rotating in normal rotation).

Also included in the above-described program for controlling the CPU 3 is a timing program for applying pulses of a predetermined period to the microcomputer monitoring circuit ERD2. When the pulse period exceeds a predetermined value due to runaway of CPU3, microcomputer monitoring circuit ERD2 turns on transistor _Tr7 through OR gate OR2, and microprocessors CPU2 and CPU3 are simultaneously reset.

With the above configuration and microprocessor control, the sheet 10 has the following effects.

(1) Microprocessor CPU of operation board 13
1 is the switch SW-M1 _D ~ M6 _D , M1 _U ~ M
6 When attempting to send status data to the electronic control unit EOCU in response to changes in the opening/closing of _U , N1 to N3 and SW-SK, the output of the vehicle speed detection circuit, the output of the IG switch opening/closing detection circuit and the door opening/closing detection circuit, etc. , as well as external switch SWI _o ,
When SW1 and SW2 ₁ to 2 ₃ are closed, the EOCU is powered on, and the CPU1,
The CPU 2 automatically maintains the power supply, and releases the power supply self-maintenance upon completion of a predetermined control operation. Therefore, standby power consumption in the EOCU is low. However, position data and other necessary data (posture data of seated persons No. 1 to 3, original position data and current position data, initialized flag and door opening/closing flag)
is retained in NRAM, and attitude data and control status are always retained.

(2) When the switch SWI _o is closed, each of the posture setting mechanisms 100 to 600 is positioned at one origin position (limit position), and at that time, the contents of the current position register m0 are set to the origin instruction data (0).
It is said that After that, the position count is subtracted or added by forward and reverse rotation of the motor, and the rotary encoder pulses are counted, and this count value is set as the current position (position data) in register m0.
is maintained. Therefore, a limit switch is not required and is not provided. Also, when reaching the home position and motor overload, the T1 timer
Set for each rotary encoder pulse generation,
It is determined whether or not the T1 time limit has exceeded, and the motor is stopped when the T1 time limit has expired to prevent overload energization of the motor.

(3) Manual adjustment key switch SW-M1 _U ~ M6 _U ,
When each of M1 _D to M6 _D is closed, the motors M1 to M6 are individually urged to rotate in reverse or forward direction.
When SW-SK is closed and then one of SWN1 to N3 is closed, each mechanism at that time is 100 to 600.
The current position data is written to NRAM.
When one of SWN1 to N3 is closed without operating SW-SK, the previously memorized position data is read from NRAM and each mechanism is set to that position. Therefore, the driver is SW-
Set the posture suitable for you with M1 _U ~ M6 _U , M1 _D ~ M6 _D , then SW-SK and SWN1 ~ N3.
After storing that data in NRAM,
You can obtain a posture suitable for you by simply closing SWN1 to N3.

(4) By pressing switches PR and PS (Fig. 1 and 2), switch SW1, SW2 ₁ or
_SW22 is closed, and the seat 10 assumes a walk-in position (seat forward, seat back tilted forward). Turn the switch PR knob counterclockwise (Figure 1)
When the switch is turned to , switch _SW23 is closed and the seat returns to the position before starting the walk-in position setting (original position). When loading someone into the back seat, the driver must get out of the vehicle and turn on the switch.
Press PR or PS to set seat 10 to the walk-in position, and after confirming that someone is sitting in the rear seat, turn the switch PR knob counterclockwise (Figure 1)
Turn it around. This returns the seat 10 to its original position. When emergency stopping the return to the original position,
Just press PR or PS twice.
Alternatively, any switch on the operation board 13 may be closed.

(5) When the ignition switch is opened and the door is opened from closed, the seat 10 moves back a set distance C ₀ minutes to make it easier for the driver to get out of the vehicle. When the door changes from opening to closing, it is assumed that the driver is seated, and the seat 10 returns to its original position after moving forward _C0 minutes.

(6) If either CPU2 or CPU3 goes out of control,
CPU2 and CPU3 are both reset and I/O
Returns to initialization, all motors stop,
Control resumes from reading the new status, and CPU2,
Synchronization and security of CPU3 is performed.

(7) The electronic control unit EOCU, which controls the energization of the posture setting mechanism, is housed in the seat bag, which reduces the number of electrical wiring that passes through the movable parts (bending parts), and also connects the seat to the vehicle. Wiring to the frame side is also reduced. sheet 10
Can operate independently. Seat 10 to vehicle
It is easy to install, and there is no need to adjust the seat on the vehicle.

〔Effect of the invention〕

As described above, the vehicle seat position control device of the present invention includes a forward and backward drive mechanism 100 including an electric motor M1 that drives the seat 11 on the vehicle back and forth, and a forward and backward drive mechanism 100 that includes the electric motor M1 that drives the seat 11 forward and backward.
A motor driver MDR that biases the seat 11 in the forward and reverse directions, and a command switch means that instructs the position change of the seat 11.
SWI _o , SW1, SW2 ₁ to _{SW2 3} generate a self-holding signal in response to the instruction of the command switch means SWI _o , SW1, SW2 ₁ to SW2 ₃ , and in response to the instruction, the command switch means SWI o, SW1, SW2 1 to SW2 3 generate a self-holding signal. The electric motor M
a motor drive control means CPU3 for instructing the rotational energization of the electric motor M1 and erasing the self-holding signal after the rotational energization of the electric motor M1 is completed;
A constant voltage circuit CPS that provides an operating voltage to the CPU 3, a switching means Tr ₃ inserted in the power supply line Vd between the constant voltage circuit CPS and the power supply, and the command switching means SWI _o , SW1, SW2 ₁ to SW2 ₃ , power-on means Tr ₁ , Tr ₂ for rendering the switching means Tr ₃ conductive in response to a change from a non-instruction state to a position change instruction state; and in response to the self-hold signal, while the self-hold signal is present; Since it is equipped with a self-holding means Tr ₆ that maintains the switching means Tr ₃ in conduction, the command switching means SWI _o , SW1, SW2 ₁ to SW
When 2 ₃ changes from the non-instruction state to the position change instruction state, the power supply means Tr ₁ and Tr ₂ turn on the constant voltage circuit CPS.
The switching means Tr ₃ inserted in the power supply line Vd between the power supply and the power supply is made conductive. As a result, the constant voltage circuit CPS applies an operating voltage to the motor drive control means CPU3. The motor drive control means CPU3, to which the operating voltage is applied, controls the command switch means SWI _o , SW
1, generating a self-holding signal in response to the position change instruction state of SW2 ₁ to SW2 ₃ , and self-holding means.
Tr ₁ and Tr ₂ respond to this self-holding signal to keep the switching means Tr ₃ conductive. The motor drive control means CPU3 also has command switch means SWI _o ,
In response to the position change instruction state of SW1, _SW21 to _SW23, the motor driver MDR is instructed to rotate the electric motor M1 of the forward/reverse drive mechanism 100. The motor driver MDR rotates the electric motor M1 in response to this instruction, and the seat 11 moves. The motor drive control means CPU3 further erases the self-holding signal after the end of rotational energization of the electric motor M1. In response to this self-preservation means
Since Tr ₁ and Tr ₂ make the switching means Tr ₃ non-conductive, the constant voltage circuit CPS is cut off from the power supply, and the operating voltage to the motor drive control means CPU 3 disappears.
Power consumption of the constant voltage circuit CPS and motor drive control means CPU3 is eliminated.

In this way, the command switch means SWI _o , SW1, SW2 ₁ to SW2 ₃ instruct the position change of the seat 11.
is in the position change instruction state, the constant voltage circuit
Voltage is applied to the CPS and the motor drive control means CPU3, and the motor drive control means CPU3 drives the seat in response to the position change instruction. After that, the voltage to the constant voltage circuit CPS and the motor drive control means CPU3 is cut off. Therefore, the constant voltage circuit CPS and the motor drive control means CPU3 consume power only when a seat position change is required, and do not consume power when a position change is not necessary. Power consumption is therefore reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a driver seat 10 incorporating an embodiment of the present invention. FIG. 2 is a side view showing the driver seat 10 shown in FIG. 1 in a walk-in position (dotted line) and a seated position (solid line). Figure 3a shows the driver seat 1 shown in Figure 1.
0 is a side view showing a state where the cover is removed. Figure 3b shows the driver seat 1 shown in Figure 1.
2 is a plan view showing the inside of the sheet 11 of No. 0. FIG. Third
FIG. c is a front view of the seat back 12 of the driver seat 10 shown in FIG. 1, viewed from the vehicle steering wheel side. FIG. 4 is an electrical circuit diagram showing an embodiment of the present invention incorporated into the driver seat 10 shown in FIG. FIG. 5a is a front view of the case SCA housing the electronic control unit EOCU shown in FIG. 4. FIG. 5b is a side view of the case SCA housing the electronic control unit EOCU. Figure 6a shows the first
FIG. 3 is an enlarged front view of the switch PR shown in the figure. 6th
Figure b is a front view of the switch PR with its cap 31 removed. FIG. 6c is a central vertical sectional view of the switch PR. Figure 6d shows
FIG. 3 is a schematic cross-sectional view showing how the switch PR is attached to the seat cover 12. FIG. 7a is an enlarged plan view of the switch PS shown in FIG. 1. Chapter 7b
The figure is a longitudinal sectional view of the switch PS. FIG. 8a is a perspective view of the passenger seat. Figure 8b shows
It is an enlarged front view of switch PR-AS1 shown in FIG. 8a. FIG. 8c is a front view of the switch PR-AS1 with the cap removed. 8th
Figure d shows the passenger seat switch shown in Figure 8a.
FIG. 2 is an electric circuit diagram showing the connection relationship of internal switches of PR-AS1, AS2 and PS-AS. FIG. 9 shows the microprocessor CPU2 shown in FIG.
7 is a flowchart showing status data transmission/reception control. Figure 10a shows the microprocessor CPU3.
3 is a flowchart showing reception control using interrupt processing. Figure 10b, Figure 10c, Figure 10d,
Figure 10e, Figure 10f, Figure 10g, Figure 10h
Figures and Figures 10i are microprocessor
It is a flowchart showing posture control and data read/write control of the CPU 3. 10: Driver seat, 11: Seat (seat), 12: Seat back, 12a: Lumbar support spring, 13: Input operation board,
PR: Push button/rotary switch, PS: Push button switch, PSC: Home position indicator switch, HR: Headrest, 14: Base frame, 15: Lower rail, 16: Upper rail, M1: Electric motor (electric motor), 100 : Seat forward/backward drive mechanism (forward/backward drive mechanism), 200: Seat back tilting mechanism, 3
00: Seat base tilting mechanism, 400: Seat back cushion changing mechanism, 500: Headrest lifting mechanism, 600: Headrest forward/backward movement mechanism,
SDR: Motor driver (motor driver), S1
~S6: Rotary encoder, EOCU: Electronic control unit, SWI _o , SW1, SW2 ₁ ~ SW2 ₃ : Switch (instruction switch means), CPU3: Microprocessor (motor drive control means), CPS: Constant voltage circuit (constant voltage circuit), Tr ₃ : transistor (switching means), Tr ₁ , Tr ₂ : transistor (power supply means), Tr ₆ : transistor (self-holding means).

Claims (1)

[Scope of Claims] 1. A forward/reverse drive mechanism including an electric motor that drives a seat on a vehicle back and forth; a motor driver that biases the electric motor in the forward and reverse directions to drive the seat forward and backward; changing the position of the seat; command switch means for instructing; generating a self-holding signal in response to the instruction of the command switch means; and in response to the instruction, instructing the motor driver to rotate the electric motor; Motor drive control means for erasing the self-holding signal after the end of energization; Constant voltage circuit for applying an operating voltage to the motor drive control means; Switching means inserted in the power supply line between the constant voltage circuit and the power supply. ; power-on means for rendering the switching means conductive in response to a change of the command switching means from a non-instruction state to a position change instruction state; and, in response to the self-holding signal, while the self-holding signal is present; A position control device for a vehicle seat, comprising: self-holding means for maintaining the switching means in conduction.