JPS6228010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blower motor control device for an air conditioner that conditions the air inside the cabin of an automobile.

Generally, as shown in FIG. 1, this type of automotive air conditioner includes a fan switch 102, a temperature lever 103, a mode lever 104, and a fan switch 102, a temperature lever 103, a mode lever 104, and It has a switching lever 105.

As shown in FIG. 2, the above-mentioned automobile air conditioner switches the rotation of the blower motor 107 installed in the air passage 106 and drives the blower 107' in multiple stages by the above-mentioned fan switch 102, and controls the air by using the inside/outside air switching lever 105. intake door 1
05' is switched to the solid line position and the two-dot chain line position to adjust the intake air taken in by the blower 107' to inside air A ₀ or outside air A ₁ . The heater core 11 is adjusted by changing the opening degree of the water tap (not shown).
Adjust the temperature of the air passing through mold lever 1.
At 04, the vent door 109 and the floor door 111 are switched to send the air to the foot nozzle 112 and the defroster nozzle 113, respectively. Actuator 115, 11
6, 117 and 118, respectively.

Conventionally, in the above air conditioner,
The blower motor 107 is also rotated when air doors such as the air intake door 105', the air mixer door 108, the vent door 109, or the floor door 111 are rotated.

However, as described above, if the blower motor 107 is rotating when the air door is rotated, a large rotational force is required to rotate the air door due to the wind pressure of the air passing through the air passage 106. In particular, a large rotational force is required near the rotation end position of the air door where the air passing through the air passage 106 is narrowed.

For this reason, the actuators 115, 11
6, 117 or 118 to drive the air door, the blower motor 10
A motor with a large capacity must be used in consideration of the rotation time of the air door 7, and if the air door is rotated manually, a large operating force is required to rotate the air door, and the air door is There was a drawback of reduced operability.

The present invention has been made in order to eliminate the above-mentioned drawbacks in air conditioners for automobiles, and an object of the present invention is to provide a blower motor control device for an air conditioner that reduces the rotational force required for rotating an air door. It is said that

For this reason, the present invention includes a blower for blowing air provided in an air passage of an air conditioner for an automobile, and an air door for passage switching provided rotatably in the air passage. an operation detection means for detecting a passage switching operation for rotating an air door; a limiting means connected to a power supply circuit of a blower motor that drives the blower, and for temporarily limiting the amount of power supplied to the blower motor by the operation detection means; and a delay means for switching the passage by rotating the air door a predetermined time after the passage switching operation is detected by the operation detecting means, and limiting the amount of air blown by the blower when the air door is rotated. It is characterized by the fact that

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 shows a block diagram of the invention.

In FIG. 3, 11 is an operation signal generation circuit;
2 is an operation detection circuit as operation detection means; 13 is a switch circuit as limiting means; 14 is a delay circuit as delay means; 15 is a control circuit;
6 is an actuator such as a motor or a diaphragm device.

Further, X ₀ is a relay that controls on/off the power supply to the blower motor 107, and R ₁ and R ₂ are resistors that switch the connection to the blower motor 107 by the fan switch 102 and switch the amount of power supplied from the battery B to the blower motor 107. be.

The fan switch 102 has a movable contact C ₀ ,
It has two common contacts C ₁ , C ₂ and three fixed contacts l, m, n, and when the blower motor 107 is in the OFF position, the movable contact C ₀ does not contact any other contact, and the blower motor is connected from the battery B to the movable contact C 0 . 107
Cut off the power supply to.

On the other hand, when the blower motor 107 is in a low speed rotation position, the fan switch 102 has its movable contact
C ₀ contacts the common contacts C ₁ and C ₂ and the fixed contact l, respectively, and applies the voltage of the battery B to the blower motor 107 through the resistors R ₁ and R ₂ .
7 is a low-speed circuit, and when the blower motor 107 is in a medium-speed rotation position, the movable contact _C0 is a common contact.
C ₁ , C ₂ and the fixed contact m, respectively, and the voltage of the battery B is passed through the resistor R ₂ to the blower motor 10.
7 and rotates the blower motor 107 at a medium speed.

Further, the fan switch 102 has its movable contact at the high speed rotation position of the blower motor 107.
C ₀ contacts the common contacts C ₁ and C ₂ and the fixed contact n, respectively, and applies the voltage of the battery B directly to the blower motor 107, causing the blower motor 107 to rotate at high speed.

The present invention provides an air conditioner having a fan switch 102 as described above.
5', air mix door 108, vent door 1
An operation command signal for rotating an air door such as 09 or floor door 111 is input to the operation detection circuit 12 and the delay circuit 14, respectively, and the operation detection circuit 12 generates a stop signal for stopping the blower motor 107 from the operation command signal. and sends the stop signal to the switch circuit 13 connected between _the common contact C ₂ of the fan switch 102 and the drive coil X ₀ of the relay When the air door is rotated, the drive coil X ₀ of relay X 0 is energized, and the movable contact X ₀ of relay X ₀ is activated _.
-c from the normally closed contact X ₀ -b side to _the normally open contact The air door is rotated at the timing described in .

That is, the operation command signal output from the operation signal generation circuit 11 is input to the delay circuit 14, and the delay circuit 14 delays the operation command signal,
When the wind pressure in the air passage 106 becomes weak,
A control circuit 15 operates an actuator 16 to rotate the air door.

Next, FIG. 4 shows a specific embodiment in which the present invention is applied to the rotational operation of the air intake door 105'.

In FIG. 4, parts corresponding to those in FIG. It consists of a switch 21 that changes, and an actuator 16 using a motor as an actuator 115.

The movable contact 21c of the switch 21 has a voltage (+
Vcc) is applied to the terminal 22, one fixed contact 21f is connected to the trigger terminal T of the monostable multivibrator 23 constituting the operation detection circuit 12 and one end of the resistor Rf of the delay circuit 14, respectively. , the other fixed contact 2 of the switch 21
1r is connected to the trigger terminal T of the monostable multivibrator 23 and one end of the resistor Rr of the delay circuit 14, respectively.

The output terminal of the monostable multivibrator 23 is connected to the base of a pnp transistor Tr 1 constituting the switch circuit 13, the emitter of the transistor Tr ₁ is connected to the common contact C ₂ of the fan switch 102, and the collector is connected to the common contact C ₂ of the fan switch 102. connected to relay X ₀ respectively.

On the other hand, the delay circuit 14 includes resistors Rf,
The other end of the resistor Rf is connected to _the base of _{the transistor Tr 2 ,} and the capacitor Cf is connected between the base and ground. , the other end of the other resistor Rr is the transistor Tr ₃
The capacitor Cr is connected between the base and ground.

The collectors of the transistors Tr ₂ and Tr ₃ are connected to the cam switches 24f and 2 of the control circuit 15, respectively.
Connected to 4r.

The control circuit 15 includes a cam switch 24 whose movable contact 24c is switched by the rotation of the motor M of the actuator 16, and a relay _X1 . , the drive coil X ₁ of the relay X ₁ is connected.

The relay X ₁ has its normally open contact X ₁ -a connected to the terminal 25 and its normally closed contact X ₁ -b connected to the ground, and between the movable contact X ₁ -c and the ground,
Motor M of actuator 16 is connected.

The motor M rotates in one direction via a rotation mechanism (not shown) having a mechanism similar to an automobile wiper, etc., and thereby opens the air intake door 105'.
Rotate to the solid line position and the two-dot chain line position.

In the present invention, the normally open contact X ₀ -a of the relay X ₀ as a switching means is connected to the ground, and when the relay X ₀ is energized, the movable contact X ₁ -c and the ground are connected. Short-circuit both ends of the fan motor 107 connected between the blower motor 107
It is preferable that the blower 107' be stopped immediately by applying dynamic braking to the blower 107'.

Next, the operation shown in FIG. 4 will be explained.

The movable contact 21c of the switch 21 of the operation signal generation circuit 11 and the movable contact 24c of the cam switch 24 of the control circuit 15 are both in the position shown in FIG. 4, and the movable contact _C0 of the fan switch 102 is in a position other than the OFF position. In this case, the air passage 106 of the air conditioner has a blower motor 107.
It is assumed that outside air _A1 is introduced.

Now, in the above state where the air intake door 105' is in the solid line position, when the movable contact 21c of the switch 21 of the operation signal generation circuit 11 is connected to the fixed contact 21r, the potential of the fixed contact 21r changes from "Low" to "High". ”, and at the timing of the rise, the monostable multivibrator 23 is triggered, and the output of its output terminal becomes “Low” for a certain period of time (for example, 1 to 2 seconds), and the output of the pnp transistor Tr ₁ is Turn it on.

By turning on the above transistor Tr ₁ , relay X ₀
is energized and its movable contact X ₀ −c becomes a normally open contact X ₀
-a, and the blower motor 107 is quickly stopped by dynamic braking.

On the other hand, when the switch 21 of the operation signal generation circuit 11 is switched as described above, the base potential of the transistor Tr ₃ rises with a time constant of Cr×Rr, and when the above potential exceeds the V _BE of the transistor Tr ₃ . , the transistor Tr ₃ is turned on, the relay X ₁ is energized, and its movable contact X ₁ -c becomes a normally open contact X ₁ -a.
The motor M of the actuator 16 rotates, and the air intake door 105' rotates.

At this time, if the time constant Cr×Rr is determined so that the transistor Tr ₃ turns on when the rotation speed of the blower motor 107 decreases, the air passage inside the air passage 106 when the air intake door 105 rotates. The wind pressure has become smaller, and the motor M of the actuator 16 does not require a large rotational force.

When the air door 105' is rotated to the position indicated by the two-dot chain line in FIG. 4, the movable contact 24c of the cam switch 24 of the control circuit 15 is switched to the fixed contact 24f, and the relay _X1 is deenergized.

When relay X ₁ is deenergized as described above, its movable contact X ₁ -c is connected to normally closed contact X ₁ -b;
Both ends of the motor M are short-circuited, the motor is dynamically braked, and the motor M stops. Then, the transistor Tr ₁ is turned on, the blower motor 107 rotates again, and the inside air A ₀ is introduced into the air passage 106 .

When the movable contact 21c of the switch 21 of the operation signal generating circuit 11 is again connected to the fixed contact 21f, the same operation as described above is performed, and the air intake door 105' is moved to the solid line position in FIG. Returning, outside air A ₁ is introduced into the air passage 106 .

If you do the above, air intake door 1
The force required to rotate the actuator 16 is small, and a small motor M can be used for the actuator 16.

In the above explanation, basic embodiments of the present invention have been described, but the present invention is not limited to the above embodiments. For example, FIGS.
The configuration shown in the figure can also be used.

In the embodiment shown in FIG. 5, a press switch 33 as an operation detection means is attached to the knob 32 of the inside/outside air switching lever 105 which is supported by a support shaft 31, and the contact points of the press switch 33 are shown in FIG. It is connected between the common contact C ₂ of the fan switch 102 and the drive coil X ₀ of _the relay The relay _X0 is deenergized and the blower motor 107 is temporarily stopped. A damper 35 is connected between one end of the spring 34 on the air intake door 105' side and a member constituting the air passage 106, and the damper 35 and the spring 34 control the air intake against the movement of the inside/outside air switching lever 105. door 1
05' movement is delayed.

By doing the above, the control circuit for the blower motor 107 becomes simple, and the operating force required to rotate the air intake door 105' is almost determined by the spring force of the spring 34 and the characteristics of the damper 35. Deterioration in the operational feel of the 105 can also be avoided.

Note that the present invention provides an air intake door 10.
Needless to say, the present invention can also be applied to air doors other than 5'.

As is clear from the detailed description above, the present invention temporarily limits the amount of power supplied to the blower motor when the air door is rotated to reduce the wind pressure in the air passage. In an air conditioner in which the air door is rotated by an actuator such as a motor, the actuator such as the motor may be small, and the cost of the air conditioner can be reduced. Furthermore, in the case where the air door is manually rotated, the operating force required to operate the operating lever of the air door is reduced, and the operating feeling can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the operation panel portion of an air conditioner for an automobile, Fig. 2 is an explanatory diagram showing the structure of the air conditioner for an automobile, and Fig. 3 is a block diagram of a blower motor control device for an air conditioner according to the present invention. Figure, 4th
The figure shows the specific circuit diagram of Figure 3, Figures 5 and 6.
The figures are explanatory diagrams of mechanical parts and circuit diagrams of embodiments different from those in FIG. 4, respectively. 11... Operation signal generation circuit, 12... Operation detection circuit, 13... Switch circuit, 14... Delay circuit, 15... Control circuit, 16... Actuator, 32... Operation knob, 33... Press switch,
34... Spring, 35... Damper, 102...
...Fan switch, 105'...Air intake door, 106...Air passage, 107...Blower motor, X ₀ ...Relay.

Claims (1)

[Scope of Claims] 1. An air conditioner for an automobile is provided with a blower for blowing air provided in an air passage, and an air door for passage switching provided rotatably in the air passage; an operation detection means for detecting a passage switching operation for rotating an air door; a limiting means connected to a power supply circuit of a blower motor that drives the blower, and for temporarily limiting the amount of power supplied to the blower motor by the operation detection means; and a delay means for switching the passage by rotating the air door a predetermined time after the passage switching operation is detected by the operation detecting means, and limiting the amount of air blown by the blower when the air door is rotated. A blower motor control device for an air conditioner, characterized in that: 2. A blower motor control device for an air conditioner according to claim 1, wherein both ends of the blower motor are short-circuited when the air door is rotated.