JPS62244220A - Step driving motor circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a step drive type motor circuit that changes the rotational position of a motor in steps.

[Conventional technology]

In recent years, a cornering lamp system for vehicles, particularly automobiles, has been proposed as a device using this type of step drive type motor circuit.

In other words, this cornering lamp system is configured so that the direction of illumination of the front light is varied in stages to illuminate the direction of travel, and the headlight is Variation of the direction of light irradiation is controlled using a step-drive motor circuit.

[Problem that the invention seeks to solve]

However, in such a cornering lamp system, until the irradiation direction of the headlight is changed to a predetermined irradiation direction, a start signal is supplied to the motor that changes the irradiation direction via the step drive motor circuit. continues to do so. Therefore, if the rotation of the motor is locked due to freezing during snowfall, etc., the irradiation direction of the headlights will not reach the predetermined irradiation direction, and the lock current will continue to flow through the motor during this time. There was a risk that the motor itself would be burnt out due to this locking current.

[Means for solving problems]

The present invention has been made in view of these problems, and is designed to cut off the supply of a starting signal to the motor after a predetermined period of time has elapsed.

[Effect]

Therefore, according to the present invention, it is possible to prevent the lock current flowing through the motor before it burns out.

〔Example〕

Hereinafter, the step drive type motor circuit according to the present invention will be explained in detail. FIG. 1 is a block circuit diagram showing a cornering lamp system for an automobile as an embodiment of this step drive type motor circuit. In the figure, 1 is a steering wheel rotation angle sensor that sends out a number of up and down signals corresponding to the right steering wheel I and left steering wheel from output terminals 1a and 1b in conjunction with the steering wheel, and 2 is this steering wheel rotation angle sensor. The UP/DOWN signal inputs the UP signal and DOWN signal sent from the rotation angle sensor 1, and counts up or down the count value by the number of input UP signals or DOWN signals.
The DOWN counter 3 is a decoder/driver that inputs the count value sent out by the UP/1)OWN counter 2 and sets only the level of the output terminal at a position corresponding to this count value to the "0" level.

The count value in the tJP/DOWN counter 2 is set to zero when the steering wheel (not shown) is in the straight-ahead steering position, and as the steering wheel is rotated clockwise (centering on that point), the count value increases sequentially. , the count value decreases sequentially by counterclockwise rotation. Then, when the count value of the counter 2 is zero, that is, when the steering wheel is located at the straight steering position, the decoder/driver 3 sets the level of the output terminal 3h to r.
When the OJ level is set, each time the count value in the counter 2 increases by 1, the output terminal position to set the rOJ level is set to the adjacent output terminal 31.3j...
The number is gradually increased to 3o. Further, each time the count value in the counter 2 decreases by one from zero, the output terminal position to be set to the "0" level is sequentially moved down to the adjacent output terminals 3g, 3f, . . . 3a. Of course, even in the countdown after the count-up or the count-up after the countdown in the counter 2, the output terminal position at the "0" level will be repeatedly lowered or lowered to the a-th adjacent output terminal position. Needless to say, this is happening.

And output terminals 3g, 3b of the decoder/driver 3
, 3c, 3d, 3e, 3f, 3g, 3h, 31
．． 3j, 3k.

31.3m, 3n, 3o are inverters 4a14b, 4
c, 4d.

4., 4f, 4g via Nando Game) 5a, 5b,
5c, 5d, 5e, 5f, 5g, and timers 6&, 5b16c, (id, 5e
.

Nantes Gate 5m, 5b, 5c via 6f, 6g.

It is connected to the other input terminal of 5d, 5e, 5f, and 5g. The timers 63 to 6g are activated when the input signal falls from the "1" level to the rOJ level, and continue to send out the rHJ level signal for a predetermined period of time, which will be described later. Output ends of the gates 5a-5g are connected to connection terminals 73-7g, respectively.

Thus, the connection terminals 7a to 7g are connected to sliding contacts 34b to 34h, which are in sliding contact with the semicircular conductor patterns 32 and 33 formed on the sliding substrate 31, respectively, and are connected to the sliding contacts 34b to 34h, which are adjacent to the sliding contact 34h. A sliding contact 341 is connected to the positive polarity side of the DC power supply 8 via a coil 351 of the relay 35 . Moreover, the sliding contact 34a adjacent to the sliding contact 34b
The relay 36 is also connected to the positive polarity side of the DC power supply 8 via the coil 361, and the coils 351 and 361 are connected to diodes 37 and 38 in parallel. Then, a normally open relay 35 is connected to both connection ends of the DC motor 39.
Normally closed contact 352 and normally open/normally closed contact 36 of relay 36
2 is connected and the relay 35 is energized, the common terminal 352C of the normally open/normally closed contact 352 and the normally open contact terminal 352a are electrically connected, and the positive terminal of the DC power supply 8 is connected to one end of the DC motor 39. The sex side can be connected. Further, when the relay 36 is in the energized state, the common terminal 362c of the normally open/normally closed contact 362 and the normally open contact terminal 36
2a are electrically connected to each other, and the positive polarity side of the DC power supply B is connected to the other end of the DC motor 39. That is, the normally open/normally closed contacts 352 and 362 are normally in a conductive state between their common terminals 352C and 362C and the normally closed contact terminals 352b and 362b, and at this time, the DC motor 39
Both ends of are grounded. Then, when DC power is supplied to the DC motor 39 via the normally open/normally closed contacts 352,
The motor rotates the lamp drive shaft 9 clockwise (clockwise rotation in the figure), and as the lamp drive shaft 9 rotates clockwise, the conductor patterns 32 and 33 also rotate clockwise together with the sliding substrate 31. It has become. Furthermore, when DC power is supplied to the DC motor 39 via the normally open/normally closed contacts 362,
The lamp drive shaft 9 rotates counterclockwise.
The conductor patterns 32 and 33 rotate to the left together with the sliding substrate 31 as the slider rotates to the left. It goes without saying that the irradiation direction of the headlight changes by rotating the lamp drive shaft 9 clockwise or counterclockwise. rotates to the right as seen from the driver's seat,
By rotating the lamp drive shaft 9 to the left, the irradiation direction of the headlight is rotated to the left.

Next, the operation of the cornering lamp system configured as described above will be explained. That is, it is assumed that the automobile is currently traveling straight ahead and the steering wheel is in the straight ahead steering position. At this time, the count value of the UP/DOWN counter 2 is zero, and only the output terminal 3h of the decoder/driver 3 is at the rOJ level. The tabs, output terminals 3a to 3g, and 31 to 3o are all at the "1" level, and the sliding contacts 34b to 34d and 34f to 34h in contact with the conductive patterns 32 and 33 are at the "1" level. Therefore, in the illustrated state, power is not supplied to relays 35 and 36, and DC motor 39
does not rotate. At this time, the headlights were stopped facing forward.

However, when the steering wheel is rotated clockwise in such a state and right steering is started, an up signal corresponding to the amount of steering wheel rotation is input from the steering wheel rotation angle sensor 1 to the UP/DOWN counter 2, and the count value is Up. This causes the decoder/driver 3 to send r
The OJ level signal is increased by 9 and sent to the output terminals 31, 3j, . . . , 30. Suppose now that the output terminal 3j of the decoder/driver 3 continues to be at the "0" level due to clockwise rotation of the handle. At this time, timer 6e
The controller starts the operation and starts sending out an "H" level signal to one end of the Nantes gate 5e. On the other hand, Nantes Gate 5e
Since a "1" level signal is input to the other end via the inverter 4e, the two-man power of the Nantes gate 5e is "
The output becomes the "1" level and the output becomes the "0" level. When the level of the sliding contact 34f is "0", the sliding contact 341 and the conductor pattern 3 are connected to the coil 351 of the relay 35.
2. Current begins to flow through the path between the sliding contact 34f and the connection terminal 7@. By energizing this coil 351,
When the common terminal 352C of the normally open/normally closed contact 352 and the normally open contact terminal 352a are not electrically connected, the DC motor 39 rotates and the lamp drive shaft 9 rotates clockwise. This clockwise rotation of the lamp drive shaft 9 moves the irradiation direction of the headlight clockwise, and the sliding substrate 31 moves its conductor patterns 32 and 3
3 is rotated clockwise while slidingly contacting the sliding contacts 34a to 34i. Then, when the sliding contact 34f separates from the conductor butter 732, the energization to the coil 351 of the relay 35 is released, and the common terminal 35 of the normally open/normally closed contact 352 is released.
2c and the normally open contact terminal 352a are not electrically connected, and the power supply to the DC motor 39 is interrupted. The DC motor 39 rotates a little due to inertia and then stops, and the sliding board 31 is moved through the opposing gap 3 between its conductor patterns 32 and 33 as shown in FIG.
It stops in a clover position with a sliding contact 34g arranged approximately in the center of 1a.

Then, after the predetermined time has elapsed in the timer 6e,
The output of the timer 6e becomes "0" level, the output of the Nant gate 5e is inverted to the rHJ level, and the sliding contact 34
The level of f becomes rOJ. Thereafter, in the same way, by continuing to steer to the right, the count value in the UP/DOWN counter 2 increases sequentially, and the decoder/driver 3
The “0” level signal position sent by
1...3o and the reciprocating gear, this causes the DC motor 3
9 rotates intermittently, and the irradiation direction of the headlight moves clockwise in stages. In addition, when the steering wheel is rotated counterclockwise from the straight-ahead steering state to perform left steering, the current value in the UP/D OWN counter 2 sequentially decreases, and the decoder/
The output signal position of the "0" level sent by the driver 3 is sequentially repeated from the top to the bottom of the output terminal 3h, and the connection terminals at which the timers 6c to 6a operate and the "0" level is set to the "0" level are sequentially repeated to the output terminals 7d to 7a. The lamp drive shaft 9 rotates to the left intermittently,
The irradiation direction of the headlights moves to the left in stages. Of course, even in the case of steering to the left after steering to the right, or steering to the right after steering to the left, the count value in the UP/DOWN counter 2 is sequentially counted down or counted up, and according to this count value. Needless to say, the irradiation direction of the headlight changes as the vehicle changes. In other words, the operating time of the timers 6a to 6g is set to be longer than the time required to change the irradiation direction of the headlights step by step. is set to the value of

By the way, in a cornering lamp system that performs such an operation, the DC motor 39 is
Let's assume that the rotation of is locked. Assume that the steering wheel is now in the straight steering position and the rotational position of the DC motor 39 is locked as shown in FIG. If the handle is turned clockwise from this state and the level of the output terminal 3j of the decoder/driver 3 becomes "0" level, the timer 6e starts its operation as described above,
When the level of the connection terminal 7e is "0", the DC motor 39
Power is supplied to the terminal via the normally open/normally closed contact 352 . However, since the DC motor 39 is in a locked state at this time, it can rotate, but the direction of irradiation of the headlight does not change. Therefore, an excessive lock current flows through the DC motor 39, and if this lock current continues to flow through the motor 39 for a long time, the motor 39 will be burnt out. However, the lock current flowing through the DC motor 39 is cut off after a predetermined time has elapsed by the timer 6e, and since this predetermined time is very short, the DC motor 39 will not burn out. In addition, if another timer starts operating during the operating period of the timer 6e, for example, the output terminal position at which the decoder/driver 3 becomes "0" level is the output terminal 31.
When the timer 6f is activated by moving to , the level at the output terminals 3j and 3 becomes rHJ, so the signal inputted to one end of the Nant gate 5e via the inverter 4e becomes the "0" level. , the level of the connection terminal 7e becomes "1" level immediately. Then, the timer 6f starts counting time again from zero, and after a predetermined time has elapsed in the timer 6f, the power to the motor 39 is cut off. Finally, even in such a case, burnout of the DC motor 39 can be prevented.

In this embodiment, the operating time of the timers 6a to 6g is set to approximately 2@, which is the time required to change the headlight irradiation direction in stages, but it is possible to change the irradiation direction without any trouble. The time may be shorter if possible, or longer if the lock current can be cut off before the DC motor 39 burns out. Further, in this embodiment, the case where the rotation of the DC motor 39 is locked due to freezing during snowfall has been described, but it is also effective when the rotation is locked due to other factors, and the cause of the rotation lock of the DC motor 39 is explained. Needless to say, after this is released, the normal operating state returns.

Further, in this embodiment, a cornering lamp system has been described, but it goes without saying that the present invention is suitable for use in general devices that control the rotation of a motor in stages.

〔Effect of the invention〕

As explained above, according to the step drive type motor circuit according to the present invention, the supply of the start signal to the motor is cut off after a predetermined period of time has elapsed, so that the lock current flowing to the motor can be blocked before it burns out. This makes it possible to prevent motor burnout accidents.

[Brief explanation of drawings]

Fig. 1 is a block circuit configuration diagram showing an example in which the step drive type motor circuit according to the present invention is applied to an automobile cornering lamp system, and Fig. 2 is a state diagram explaining the operation of the sliding board in this cornering lamp system. be. 1...Handle rotation angle sensor, 2...UP/D
OWN counter, 3...decoder/driver, 6a
~6g...Timer, 9...Lamp drive shaft, 31
...Sliding board, 32.33...Conductor pattern,
34a-341...Sliding contact, 39...DC motor. Patent applicant Koito Seisakusho Co., Ltd. Agent Kazuki Yamakawa (#υ12 people) Figure 2

Claims (1)

[Claims] In a step drive type motor circuit that continues to supply a starting signal to the motor until the rotational position of the motor is varied to a predetermined rotational position, the starting signal cutoff that cuts off the supply of the starting signal to the motor after a predetermined period of time has elapsed. A step drive type motor circuit characterized in that a step drive type motor circuit is provided with a means.