JPS5897514A - Lock preventer for automotive motor - 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 The present invention relates to a lock prevention device ζ for an automobile motor, and particularly to a lock prevention device that rotates the motor in reverse when the motor is locked.

Conventionally, a motor used in a vehicle air conditioner controls, for example, an inside/outside air switching door, an air mix door, a mode switching door, etc. Even if the power supply voltage drops to a low voltage, or In order to be able to control the opening degrees of the various air control doors mentioned above even when the ambient temperature drops to an extremely cold temperature or becomes extremely hot in the middle of summer, a reduction gear is used to reduce the torque by, for example, 20 to 9. - It is set to have a low torque of about 100 yen.

However, when such a high-torque motor is used, the air control doors, links, levers, gears, etc. may be damaged at the fingertips of the repair inspector during repair and inspection of vehicle air conditioners.
If flI clothes or the like are caught, they may get caught by a door or the like, resulting in an unexpected accident. If a foreign object gets caught in the above control door, etc., not only will the foreign object be damaged, but the air control door will be firmly locked due to the foreign object getting stuck, making it impossible to rotate the door at all. In some cases. In particular, if a foreign object is caught, if the motor is rotated in reverse for a certain period of time, the foreign object may fall off naturally, but with conventional models, the motor cannot be reversed, so the foreign object cannot be removed naturally. .

The purpose of the present invention is to detect the locked state of the air control door controlled by the motor by detecting the load current of the motor for an automobile, and to rotate the motor t in reverse for a certain period of time so that the air control door, which is controlled by the motor, is locked. The purpose of this invention is to eliminate the above-mentioned drawbacks by making it possible to easily remove the fingertips or foreign objects of a repair person, etc., and will be described in detail below using examples.

FIG. 1 shows a lock prevention device for an automobile motor according to the present invention, particularly a lock prevention device for a motor that rotates in both forward and reverse directions. The motor 1 has one end connected to a PNPN box transistor 2 connected in series.
and the NPN type second transistor 3,
The other end is connected to a connection point between a PNPN cylindrical transistor 4 and a fourth NPN transistor 5 which are connected in series.

Each of the transistors 2 to 5 constitutes a motor rotation direction switching circuit 6, and the base sides of the first transistor 2 and the second transistor 3 are connected to the collector side of the transistor 9; The base sides of the transistor 4 and the fourth transistor 5 are connected to the collector side of the transistor 12, and these transistors 9 and 12 are connected to each exclus sheep OR circuit 14 .
controlled by the output from 15. Note that a diode 8 is provided on the base side of the transistor 3, and a diode 8 is provided on the base side of the transistor 3.
A diode 11 is connected to the base side of the transistor 9, and the transistors 9 and 12 are connected to the power supply side through diodes γ and 10. Excl sheep or circuit 14.15 above
Control signals a and ri are supplied to one input terminal of the
The output terminal of an operational amplifier 17 as a comparator constituting the lock detection circuit 16 is connected to the other input terminal, and the inverting input side of the operational amplifier 11 is connected to a resistor 18 and a resistor 1.
9 via a resistor 20, the reference voltage v1 is supplied to the inverting input side, and the signal v2 from the load current detection circuit 21 is supplied to the non-inverting input side via the resistor 22. will be supplied. In this case, when the output signal 2 from the load current detection circuit 21 becomes larger than the reference voltage signal V1, the operational amplifier 17 constituting the lock detection circuit 16
Its output is inverted to H level. The load current detection circuit 21 includes a resistor 23 whose one end is connected to the emitter side of the second transistor 3 and the fourth transistor 5 and whose other end is connected to the ground side, and a capacitor 24 connected in parallel to this resistor 23. For example, when the motor 1 is in a locked state, a load current flows through the resistor 23, and the voltage applied to the resistor 23 increases, which causes the charging voltage of the capacitor 24, that is, the output voltage V2, to increase. I ended up doing it. The output terminal of the operational amplifier 17 is connected to the non-inverting input side of the operational amplifier 17 constituting the lock detection circuit 16 via a diode 25 and a resistor 26, and the output terminal of the operational amplifier 17 is connected to a timer. The circuit 27 e411 is connected to one input terminal A of a one-shot multivibrator 28, and the negative output terminal of this one-shot multivibrator 28 is connected to one input terminal A of a one-shot multivibrator 29. Oh dear,
The positive output terminal of this one-shot multivibrator 29 is connected to the inverting input side of the operational amplifier 17 via a diode 30. Furthermore, multi-by break 28
．． 29 is a capacitor 31, 32 for setting the output pulse width.
, resistors 33, 34, etc. are connected. In this case, the timer circuit 2T activates the one-shot multivibrator 28 when the output signal sent from the lock detection circuit 16 is inverted from L level to H level at time tl as shown in FIG. The one-shot multivibrator 29 sends out an output having a pulse width of the set time T1 as shown in FIG.
- A pulse output having a pulse width of set time T2 is sent out as shown in FIG. Therefore, the output from the operational amplifier 17 is restored from the H level to the L level.

Next, the operation of the lock prevention device for an automobile motor having the above configuration will be explained. First, when the motor 1 is normal, the output signal v2 from the load current detection circuit 21 is smaller than the reference voltage signal v1, so the output of the operational amplifier 1T is at the L level, which causes the motor to rotate in the direction Control circuit 1
3 is supplied with an L level input from the lock detection circuit 16, and therefore, an L level input is supplied from the operational amplifier 17 to one input terminal of the exclusive sheep OR circuits 14 and 15, respectively. Therefore, at this time, the exclusive OR circuits 14 and 15 send the control signals a and b supplied to the other input terminal as output without inverting them. That is, if the control signal a is, for example, an H level signal, and the control signal is an L level signal, an H level output is sent from the exclusive sheep OR circuit 14, which is supplied to the transistor 9, and the transistor 9 responds to this. Based on this, the first transistor 2
is turned on, and the second transistor 3 is turned off. Also, when the control signal is at L level, the exclusive sheep OR circuit 15
An output of 9L level is sent to the transistor 12, and since the transistor 12 is Fp off, the third transistor 4 is turned off and the fourth transistor 5 is turned on, and thus the first... Since the fourth transistor 2.5 is turned on, a current in the direction of the arrow If force flows through the transistors 2 and 5 to the motor 1, and the motor 1 is rotated in the normal direction. - If the force control signal a becomes L level and the control signal a becomes H level, contrary to the above, the second force control signal a becomes L level. Since the third transistor 3.4 is turned on, a current firt in the opposite direction to the current IF flows through the motor 1, causing the motor 1 to rotate in reverse. Also, if the control signal a goes to H level and the control signal also goes to H level, the first .
The third transistors 2 and 4 are on, and the second . Since the fourth transistor 3.5 is turned off, the current is cut off and the motor 1 is stopped. That is, control signal a.

By controlling the level of b, the motor 1 can be rotated forward, reversed, and stopped, and the motor 1 can be used to control an air control door, such as an air mix door. Next, if a fingertip or a foreign object gets caught in the air control door or the link or lever that drives this door, the motor 1 will be in a locked state, and the load current detection circuit 21 will When the transmitted signal v2 becomes larger than the signal v1, the lock detection circuit 16
Since the output sent from the circuit is inverted to H level, this signal is supplied to one input terminal of the exclusive sheep OR circuit 14.15, and this signal is supplied to one input terminal of the exclusive sheep OR circuit 14.1.
5 acts as an inverting circuit. Therefore, the control signal a goes to H level, and the control signal goes to L level, which causes the motor to output one force.
The control signal is inverted from H level to L level by exclusive sheep OR circuit 14 and supplied to transistor 9, and the control signal is inverted from L level to H level by exclusive sheep OR circuit 15 and supplied to transistor 12. Ru. Therefore, the transistor 9, which was on during normal rotation, is turned off, and the transistor 12, which was off during normal rotation, is turned on, so that the second transistor 3 and the third transistor 4 are both turned on, so that the motor 1 A current flows in the direction opposite to the current IF and is reversed. On the other hand, the H level output sent from the lock detection circuit 16 is also supplied to the timer circuit 27, so after the set time Tl has elapsed, the pulse output shown in FIG. This increases the input voltage supplied to the inverting input side of the operational amplifier 17, so that the output of the operational amplifier 17 goes to the H level as shown in FIG. 2G). It will be restored to L level. Therefore, this excludes the sheep-or circuit 14 which constitutes the motor rotation direction control circuit 13.
15 is reversed and the control signals a and b are supplied to the transistors 9 and 12 at the same level, so that the transistor 9 is turned on and the transistor 12 is turned off. Since the fourth transistors 2 and 5 are turned on, current IF flows through the motor 1, and the motor 1 returns to the normal rotation state. Therefore, the motor 1 is rotated in the reverse direction for a set time T1, and if a fingertip or a foreign object comes off during this period, the motor 1 will not continue to rotate in the normal direction, but will automatically recover.

FIG. 3 is a circuit diagram showing another embodiment of the anti-rotation device for an automobile motor according to the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals. In this case, the anti-lock device is
The motor 40 is designed to prevent locking of a motor 40 whose rotating direction is always in two fixed directions and whose stop position is controlled. This drives the mode setting door that controls the blowing direction. That is, the motor 40
With the driving force of the output gear linked to The output gear 41 has a notch 4 on a part of its circumference.
2 is provided with a conductive track 43.
On the circumferential side of this conductive track 43, rotary position selection contacts 44, 45, 46, 4γ and a common contact 48 are arranged so as to maintain contact.
are installed at locations corresponding to the stop positions of the mode setting door, and these selection contacts 44-4T are connected to transistors 49-52 whose emitters are connected to the power supply, respectively.
are connected to the collector side of the transistors 49 to 52, and selection signals 81 to S4 are supplied to the base sides of the transistors 49 to 52, respectively. The transistors 49 to 52, the contacts 44 to 48, and the conductive track 4
3 constitutes a motor rotation position selection circuit 60. A motor rotation direction switching circuit 6 is connected between the common contact 48 and the ground. The other end is connected to a connection point between a normally open switch 55 and a normally closed switch 56 connected in series. The normally closed switch 53 and the normally open switch 55 are controlled by a relay 51 that constitutes the motor rotation direction control circuit 13, and the normally open switch 54
and normally closed switch 56 are controlled by relay 58. Note that the relays 57 and 58 are always off, and therefore the motor 40 is set so that a current If in the normal rotation direction flows through the normally closed switches 53 and 56. The relays 57 and 58 are both connected to the collector side of the transistor 59, and the base side of the transistor 59 is connected to the collector side of the transistor 59.
An output signal from lock detection circuit 16 is supplied via resistor tiO.

In the above configuration, in a normal state when the motor 40 is not in a locked state, the stop position of the motor 40 and the mode setting door driven thereby can be controlled by the selection signals 81 to SII. For example, when only the selection signal S2 becomes L level, the transistor 50 is turned on, so the contact 45, the conductive track 43, the common contact 4
8, Motor rotation direction thread cutting circuit 6, Motor 40, Resistor 23
A current If in the forward rotation direction flows through the motor 40, causing the motor 40 to rotate in the forward direction. This causes the multi-output gear 41 to rotate in the forward direction F, and the point of contact 45 corresponds to the notch 42. in,
The electric current If is cut off, and the motor 40 and the mode setting door are stopped at this position, and the mode setting door is thus set to a mode in which conditioned air is blown out, for example, toward the face. Also, other selection signals Sl, s,.

By controlling S4 in the same manner, the stopping positions of the motor 40 and the mode setting door can be selected at predetermined positions. In this way, the motor 40 rotates in a predetermined direction, and its rotational position is selected by the selection signal s, -84. Next, a case will be described in which the motor 40 is locked due to a finger or a foreign object being caught in the motor setting door, or the link, lever, or output gear 41 that drives this door.In other words, in the locked state, the resistor 2j As the load current flowing through the capacitor 24 becomes larger, the voltage charged to the capacitor 24 gradually becomes larger. Therefore, the output signal V2 of the load current detection circuit 21 becomes larger than the reference voltage signal Vl, and the output signal V2 of the load current detection circuit 21 becomes larger than the reference voltage signal Vl. When the output of the operational amplifier 17 is at H level, the motor rotation direction control circuit 1
The transition that makes up 3.

Since the starter 59 is turned on, the relays 57 and 58 are excited, and therefore only the normally open switches 54 and 55 that constitute the motor rotation direction switching circuit 6 are turned on. Since this current flows, the motor 40, the output gear 41, and the mode setting door are rotated in the opposite direction. When the operational amplifier 17 of the lock detection circuit 16 sends out a 9H level output, this output is fed back to its non-inverting input side via the diode 25 and the resistor 26t, so the output is held at the H level. Then, this output is supplied to the timer circuit 2T, and from the timer circuit 27, after the set time T1 has elapsed, the output shown in FIG. Therefore, the operational amplifier 17 is inverted to its original state and its output becomes L.
level, transistor 59 is off, relay 57.
58 is turned off, the motor rotation direction switching circuit 6 is restored, and the motor 40 rotates in the normal direction.

That is, according to the present invention, even in the case of the type of motor that always rotates in a fixed direction as described above, when the motor is in a locked state, it rotates in reverse for a fixed period of time, and then rotates in the original rotation direction. This makes it possible to remove the fingertip or foreign object when reversing the rotation, thereby preventing serious accidents, and enabling automatic recovery from the locked state.In other words,
In conventional motor lock prevention devices, when the motor becomes locked, the power switch is turned off to stop the motor from rotating.
The fingertip, foreign object, etc. may remain trapped, leading to a serious accident or making it impossible to recover from the accident. According to the present invention, since the rotation is reversed for a certain period of time after locking, the fingertip, foreign object, etc. may come off naturally during this time, and when it comes off naturally, it will automatically recover and
Since the motor is operated, it is possible to continue operation without stopping the operation of the vehicle air conditioner, and it is possible to prevent the passenger's feeling from deteriorating.

Furthermore, since the load current of the motor does not become excessive, accidents such as burns to the motor or peripheral equipment can be prevented.

Similarly, in the present invention, a motor for controlling an air mix door and a mode setting door has been described, but the present invention is not limited thereto. motor for doing,
Alternatively, the present invention can be similarly applied to motors for controlling other control devices.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the lock prevention device for an automobile motor according to the present invention, FIG. 2 is a time chart explaining its operation, and FIG. It is a circuit diagram showing another example of the lock prevention device for an automobile motor according to 1.40...Motor, 6...Motor rotation direction switching circuit, 13...Motor rotation direction control circuit, 16. ...Lock detection circuit, 21-...Load current detection circuit, 2γ...
- Timer circuit, 60-... Motor rotation position selection circuit. Patent applicant Jun Miyazono, patent attorney representing Diesel Kiki Co., Ltd. −

Claims (1)

[Claims] A motor rotation direction switching circuit that switches the rotation direction of the motor between forward and reverse directions, a load current detection circuit that detects the load current of the motor, a lock detection circuit that determines the output from this load current detection circuit, and Based on the output from the lock detection circuit, the motor rotation direction switching circuit is controlled,
An automobile motor lock prevention device comprising a motor rotation direction control circuit that reverses the motor, and a timer circuit that operates based on the output from the lock detection circuit and restores the motor rotation direction control circuit at a set time. .