JP2786422B2 - Vehicle storage stool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stowable stool for a vehicle which can be placed in a seating state or stowed on a backrest or the like according to the degree of congestion of a person getting into the vehicle.

[0002]

2. Description of the Related Art Conventionally, a vehicle in which a seat can be seated by one or a plurality of motors, or which can be stored in a back slip or the like, according to the degree of congestion of a person getting into the vehicle. When a proximity sensor or the like detects that the seating surface has been driven in a designated direction, that is, in the direction of a seatable position or a stowed position, control of stopping current supply to the motor is performed. Have been done. Alternatively, by setting an operation time from the current supply start timing to the current supply stop timing to the motor, the control to stop the current supply to the motor when this operation time has elapsed is performed.

[0003]

In the above-described conventional stowable type vehicle stool, when a seat is driven and stopped, a control means for stopping power supply to the motor by detecting a proximity sensor is generally used. Because the number of seats per vehicle is very large, many proximity sensors are used,
Therefore, there is a problem that the total cost of the proximity sensor becomes extremely high and it takes time to adjust the position of each proximity sensor. Furthermore, since the detection position of each proximity sensor changes due to the torsion of the vehicle and the stop position of the seat changes, the position of the proximity sensor must be readjusted each time. On the other hand, if the control means for stopping the current supply to the motor is used when the set operation time elapses, when the seat surface is stopped in the middle of the operation due to an abnormality of the driving mechanism of the seat surface, the operation is performed. Over time, overcurrent continues to flow through the motor, causing the motor to heat up and burn out.

It is therefore an object of the present invention to provide a retractable stool for vehicles which is inexpensive, easy to adjust, and free from the risk of burning.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a motor for driving a seat to a seated state or a stowed state and the motor.
Current detecting means for detecting the current of the motor, wherein the control means detects the current by the current detecting means except at the time of start-up. The current supply to the motor is stopped when the time when the magnitude of the current exceeds the set value continues for the set time.

According to a second aspect of the present invention, in the first aspect of the present invention, the control means continues the set time when the magnitude of the current detected by the current detection means exceeds a set value. After stopping the current supply to the motor,
A retry control for supplying a current for driving the seat again in the same direction as before the stop is performed on the motor.

According to a third aspect of the present invention, in the second aspect, the seating surface is driven by one motor, and the control means controls the motor so that the magnitude of the current of the motor is: The retry control is repeated until the time exceeding the set value continues for the set time within the set time excluding the start time after the start of energization to the motor.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the seating surface is driven by a plurality of motors, and the control means controls the magnitude of the current of all the motors. That is, the retry control is repeated until the time exceeding the set value continues within the set time except the start time after the start of energization of each of the motors and continues for the set time.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the current detecting means uses a voltage generated by a current supplied to the motor as a power supply voltage. That is.

[0010] The retractable stool for a vehicle according to claim 1,
The drive current of the motor for driving the seat is detected by the current detecting means, and it is determined that the seat has moved to the specified position based on the detected drive current, and the energization of the motor is stopped.
It is inexpensive, easy to adjust, and has no risk of burning.

According to a second aspect of the present invention, there is provided a retractable stool for a vehicle,
After stopping the energization of the motor, retry control is performed to re-energize the motor to drive the seat in the same direction as before the stop, so if the seat is not stopped at the specified position However, the seat can be stopped at the designated position by the retry control.

According to the third and fourth aspects of the present invention, the retraction control is repeated until the driving current of the motor reaches a predetermined state, so that the seat surface is reliably stopped at the designated position. be able to.

[0013] The retractable stool for a vehicle according to the fifth aspect,
There is no need for a separate power supply for the current detection means.

[0014]

Next, an embodiment of the present invention will be described. FIG. 1 is a front view showing a schematic structure of the retractable stool 1 for a vehicle, and FIG. 2 is a side view of FIG. As shown in FIG. 1 and FIG.
The two motors L have a position P1 in which the seating surface 2 can be seated and a storage position P2 stored in the back slip 3 as a moving end.
It is configured to be rotated by M (left motor) and RM (right motor). Since the mechanical drive structure of the retractable stool 1 for a vehicle is the same as that of a conventional mechanism, illustration and description of the mechanism are omitted.

FIG. 3 shows an electric circuit for driving and controlling the two motors LM and RM. In FIG. 3, a DC power supply circuit 4 is a common drive power supply circuit for two motors LM and RM. The power relay 5 has two motors L.
The current supplied to each of M and RM is turned on / off, and the direction of the current is switched between forward and reverse. still,
Although only one power relay 5 is shown, it is actually provided for each of the motors LM and RM. Further, the control circuit 6 having the microcomputer as a central function, based on an overcurrent detection signal described later, controls each power relay.
5 is controlled.

A resistor R1 is connected to the input side of the power relay 5.
Is connected to the output side of the power relay 5 and a DC motor LM (RM) is connected to the power relay 5.
Is controlled to turn on, and a current is supplied to the motor LM (RM), a voltage proportional to the drive current is generated across the resistor R1. A resistor R2 and a variable resistor VR are connected in series to both ends of the resistor R1, and the voltage across the resistor R1 is divided by the resistor R2 and the variable resistor VR. This divided voltage is applied to the base of the transistor Q1 via the resistor R3.
Applied to the Since the transistor Q1 is of the NPN type, when the base voltage becomes higher than a predetermined value, that is, when the magnitude of the driving current flowing through the motor LM (RM) becomes larger than the normal value, the transistor Q1 is turned on. Become. By adjusting the variable resistor VR, the transistor Q1
Can be arbitrarily set to an overcurrent value at which the switch is turned on. The voltage across the resistor R1 is used as a drive power supply for the transistors Q1 and Q2 and a light emitting diode of the photocoupler Q3 described later. In addition, motor LM
The current detection element that detects the drive current of (RM) is not limited to a resistor.

When the driving current flowing through the motor LM (RM) becomes an overcurrent and the transistor Q1 is turned on, a resistor R4 connected to the collector of the transistor Q1 is turned on.
Is applied to the base of the NPN transistor Q2. Thus, when transistor Q1 is switched on, transistor Q2 is also switched on. The light emitting diode of the photocoupler Q3 is connected to the collector of the transistor Q2 via the resistor R5. Therefore, when the transistor Q2 is turned on, the light emitting diode of the photocoupler Q3 emits light, and the photocoupler Q3
Are turned on, and the switch-on signal is input to the control circuit 6 described above.

As is apparent from the above description, the resistance R1
To R5, the variable resistor VR, the transistors Q1 and Q2
And a photocoupler Q3, a current detection circuit for detecting a current supplied to the motor LM (RM). Since this current detection circuit needs to be provided for each of the motors LM and RM, two sets of current detection circuits having the same characteristics are provided.

The control circuit 6 controls on / off of the power relay 5 based on the characteristics of the motor current as shown in FIG. In FIG. 4, the current I1 on the vertical axis is the motor LM.
(RM) is a normal current value when driving the seat surface 2 from the position P1 to the position P2 or vice versa, and the current I2 is a position where the seat surface 2 can be seated or stored. This is an overcurrent detection value (overcurrent setting value) that flows when the motor reaches a position and comes into contact with a stopper (not shown), a back slip 3 or the like, and the current I3 stops energization of the motor LM (RM). This is the current value immediately before. The current I4 is a starting current value. On the other hand, the time T1 on the horizontal axis is the starting current conduction time during which the starting current flows (generally several milliseconds to several tens of milliseconds)
The time T2 is the current I1, that is, the time during which the normal current flows, and the time T3 is the set time from when the overcurrent is detected to when the energization of the motor LM (RM) is stopped.

The control circuit 6 has a setting time T longer than the starting current conduction time T1 to prevent malfunction due to the starting current.
This signal is not accepted unless the overcurrent detection time is set to 3 and the output time of the signal from each photocoupler Q3 does not continue for the set time T3 or more.

Next, the motor LM using the electric circuit shown in FIG.
(RM) drive / stop control will be described with reference to the timing chart of FIG. The seat surface 2 is moved from the position P1 to the position P2, or vice versa.
At the time of driving to 1, when a start switch (not shown) is pressed, a drive command signal by the switch is input to the control circuit 6. When the drive command signal is input to the control circuit 6, the control circuit 6 controls each of the power relays 5 to be turned on, and supplies a drive current in a predetermined direction to the motors LM and RM. When a drive current is supplied to the motors LM and RM, the above-described starting current I4 flows during the time T1, and an overcurrent detection signal is output from the photocoupler Q3. The control circuit 6 does not accept this signal because it is shorter than the current detection time T3.

After the starting current supply time T1 has elapsed, the normal current supply state is established. When the seat surface 2 reaches the seatable position or the storage position, the drive current of one of the motors RM reaches the above-described overcurrent detection value I2. Further, when the overcurrent setting time T3 elapses in this state, the power relay 5 on the motor RM side is controlled to be turned off, and the energization of the motor RM is stopped. When the drive current of the other motor LM reaches the above-mentioned overcurrent detection value I2 a little later than the overcurrent detection timing of the motor RM and the set time T3 elapses in this state, the motor LM side The power relay 5 is controlled to be turned off, and the energization of the motor LM is also stopped. The state up to this point is defined as a normal operation range.

As described above, the two motors LM, R
When the seat surface 2 is driven by M, two motors L are theoretically provided.
The drive currents of the M and RM reach the overcurrent set value I2 at the same time, but the drive currents of the two motors LM and RM reach the overcurrent set value due to differences in the characteristics of the motors. The timing is usually slightly different. Therefore, as shown in FIG. 5, there is a time difference in the timing for controlling the power relays 5 to be turned off, and the timing for stopping the current supply to the two motors LM and RM is different. The set time T
3 can also be set to be equal to or less than the activation current conduction time T1,
In this case, the control circuit 6 sets so as not to input a signal from the photocoupler Q3 during the activation current supply time T1.

By the way, in the actual retractable stool 1 for a vehicle, as described above, due to the difference in the characteristics of each motor or the variation in the load on each motor at the time of assembly, two motors are used.
When the seating surface 2 is not stopped at a specified position such as a seatable position or a storage position in the above normal operation range due to different stop timings of the LM and RM, a sudden stop due to an external factor, or the like. There is. Therefore, the control circuit 6 controls the motors LM, LM,
After stopping the RM, the following retry control is performed.

That is, as shown in FIG.
After the stop of M and RM, each power relay 5 is turned on, and a drive current for driving the seat 2 in the same direction as before the stop is applied to the two motors LM and RM again. At this time, the seat 2
Is stopped at the specified position, the drive currents of the two motors LM and RM reach the overcurrent detection value I2 from the time when the starting current is supplied, but the seating surface 2 is securely positioned at the specified position. If the motor is not stopped, one or both of the two motors LM and RM are driven.
After the elapse, the driving current of the motor becomes the normal current value I1.
Then, after energizing the two motors LM and RM again,
If the drive currents of both motors reach the overcurrent detection value I2 within a predetermined time T4 excluding the start current supply time T1, and if this state continues for the set time T3 and the power supply is stopped, the seating surface 2 is securely placed. It is determined that the motor has reached the designated position and the subsequent retry control is stopped. On the other hand, the drive current of one of the motors reaches the overcurrent detection value I2 within a predetermined time T4 excluding the start current supply time T1. If not, it is determined that the seating surface 2 has not reached the specified position without fail, and after stopping, the retry control is performed again.

In the above embodiment, the seat 2 is driven by two motors. However, the seat 2 may be driven by one motor or three motors. The motor may be driven by the above motor. When the seating surface 2 is driven by one motor, a predetermined time T4 excluding the starting current energizing time T1
Within this time, when the drive current of the motor reaches the overcurrent detection value I2 and this state continues for the set time T3, the retry control is stopped. When the seating surface 2 is driven by three or more motors, the drive current of all the motors reaches the overcurrent detection value I2 within a predetermined time T4 excluding the start-up current supply time T1. Stops the retry control when continues for the set time T3. Further, the retry control may be performed after a predetermined time has elapsed after the power supply to all the motors is stopped, or may be performed immediately. Further, the time T1 can be changed as needed according to the motor, the load, and the like, and the time T3 can be set to various values including zero.

[0027]

According to the first aspect of the present invention, the drive current of the motor for driving the seat is detected by the current detecting means, and the seat is moved to the designated position according to the magnitude of the detected drive current. Then, the motor is de-energized, so that it is inexpensive, easy to adjust, and there is no danger of burnout.

According to the second aspect of the present invention, after the energization of the motor is stopped, retry control is performed to energize the motor with a current for driving the seat in the same direction as before the stop. There is an effect that the seat can be stopped at the specified position by the retry control even when the seat is not stopped at the specified position.

According to the third and fourth aspects of the present invention, the retry control is repeated until the driving current of the motor reaches a predetermined state, so that the seat can be reliably stopped at the specified position. effective.

According to the fifth aspect of the present invention, another power supply for the current detecting means is not required.

[Brief description of the drawings]

FIG. 1 is a front view of a retractable stool for a vehicle.

FIG. 2 is a side view of a retractable stool for a vehicle.

FIG. 3 is an electric circuit diagram of a retractable stool for a vehicle.

FIG. 4 is an explanatory diagram of control of an electric circuit of the vehicle-mounted stool.

FIG. 5 is a timing chart of an electric circuit of a retractable stool for a vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage type stool for vehicles 2 Seat surface 3 Back slip 4 DC power supply circuit 5 Power relay 6 Control circuit Q1 Transistor Q2 Transistor Q3 Photocoupler R1 to R5 Resistance VR Variable resistor LM Motor RM Motor

Continuing on the front page (72) Inventor Kazuyuki Goto 2 Kirihara-cho, Fujisawa-shi, Kanagawa Prefecture Inside Shiroki Corporation (72) Inventor Hiroshi Suzuki 2 Kirihara-cho, Fujisawa-shi, Kanagawa Prefecture Inside Shiroki Corporation (72) Inventor Kunihiko Koiwa 3-1, Okawa, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Tokyu Vehicle Manufacturing Co., Ltd. (56) References JP-A-9-290753 (JP, A) (58) Fields investigated (Int. Cl. ⁶⁾ , DB name) B60N 2/30

Claims (5)

(57) [Claims] 1. A retractable stool for a vehicle, comprising: a motor for driving a seating surface to a seated state or a stored state; and control means for controlling energization of the motor. A current detecting means for detecting a current is provided, and the control means controls the motor when the magnitude of the current detected by the current detecting means exceeds a set value for a set time other than at the time of starting. A retractable stool for vehicles, characterized in that energization is stopped. 2. The motor control device according to claim 1, wherein the control unit stops supplying the current to the motor after the current detected by the current detection unit exceeds a set value for a set time. 2. The stowable stool for a vehicle according to claim 1, wherein retry control is performed for applying a current for driving the seat surface in the same direction as before stopping the seat surface again. 3. 3. The seating surface is driven by one motor,
The control means determines that the magnitude of the current of the motor is smaller than the motor current.
3. The retractable stool for a vehicle according to claim 2, wherein the retry control is repeated until the time exceeding the set value continues within the set time after the start of energization of the power supply within the set time excluding the start time. 4. The motor according to claim 1, wherein said seat is driven by a plurality of motors, and said control means determines that the magnitude of current of all of said motors is at the time of starting after energization of each of said motors. The retractable seat for a vehicle according to claim 2, wherein the retry control is repeated until a time exceeding a set value continues within the set time excluding the set time. 5. The retractable stool for a vehicle according to claim 1, wherein said current detecting means uses a voltage generated by a current supplied to said motor as a power supply voltage. .