JPS6347128Y2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to an air conditioning system for vehicles, and more particularly to control of a blower when rapidly cooling the interior of a vehicle.

For example, if the temperature inside the vehicle is extremely high due to exposure to the scorching sun, rapid cooling is required. At this time, the vehicle air conditioner drives the compressor to cool the evaporator and sets the air mix door to full cooler mode so that the mixing ratio of cold air is maximized. As the temperature inside the vehicle gradually decreases due to such rapid cooling operation, as shown in A in Figure 1, the rotation speed of the fan is controlled from high speed to low speed, and the temperature inside the vehicle decreases. In the state where the number of air blowers is lowest, the rotational speed of the blower becomes low, and cold air is blown out from the air outlet of the duct at a low speed.

However, according to such control, the rotation speed of the blower is only controlled to a low rotation speed in accordance with the decrease in the temperature inside the vehicle during rapid cooling.
During this rapid cooling, there was not much effect of providing a greater feeling of cooling to the body. In other words, even if the temperature of the blown air gradually decreases, the number of rotations of the blower will decrease, but the volume of air blown toward the passenger remains constant for a short period of time, so that the skin adapts to the temperature of the blown air. This had the disadvantage that it did not provide much of a cooling sensation.

The purpose of this invention is to vary the power supply voltage of the blower to create a pulsating wave of blown air when the blower rotation speed is set from high speed to low speed during rapid cooling, thereby creating a rapid cooling sensation. This is to make it even higher.

FIG. 2 is a simplified configuration diagram showing an embodiment of the vehicle air conditioner according to the present invention, and in the same figure,
An actuator 4 controls an internal/external air switching door 3 that adjusts air introduced from an external air port 1 and an internal air port 2. After the air from the outside air port 1 and the inside air port 2 is introduced by the blower 5, it is cooled by the evaporator 6 and heated by the heater core 7, and the mixing ratio of the cold air and warm air is determined by the air mix door. 8. This adjusted air is blown out from the face outlet 9, the foot outlet 10, or the defrost outlet 11. Air from the outlets 9, 10, 11 is controlled by mode switching doors 12, 13. The actuator 14 that controls the air mix door 8 and the actuator 4 that controls the inside/outside air switching door 3 are controlled by a control device 15. Further, the rotation speed of the blower 5 is set by the drive circuit 20,
This drive circuit 20 receives a rotation speed setting signal 15a from a rotation speed control means 15L provided in the control device 15.
A pulsation signal 15b is supplied from the pulsation setting means 15M.

The control device 15 obtains a comprehensive signal by calculating the set temperature signal from the temperature setting device 16, the inside air temperature signal from the vehicle interior temperature sensor 17, the outside air temperature signal from the outside air sensor 18, etc. Based on this, the internal/external air switching door 3 and the air mixer door 8 are controlled according to predetermined characteristics, and the rotational speed setting signal 15a is output to set the rotational speed of the blower 5.

The drive circuit 20 includes, for example, resistors 21 to 24 connected in series and a movable contact 25 as shown in FIG.
a is connected to the motor 5, a fixed contact 25b is connected to one end of the resistor 21, and a fixed contact 25c is connected to the resistor 2.
A fixed contact 25d is connected to the connection point between resistors 22 and 23, and a fixed contact 25d is connected between the resistors 22 and 23.
A rotation speed setting device 25 in which e is connected to the connection point between the resistors 23 and 24 and a fixed contact 25f is connected between the resistor 24 and the ground, and a variable resistor 26 connected in series to the power supply circuit of the blower 5. It consists of
The rotation speed setting device 25 may be configured using a switching element such as a semiconductor element, and the rotation speed setting device 25 can be configured to switch its movable contact 25a by the rotation speed setting signal 15a.
By switching to any one of the fixed contacts 25b to 25f, the current flowing through the blower 5 is controlled and the rotational speed of the blower 5 is set to a predetermined rotational speed. For example, if the movable contact 25a is switched from the fixed contact 25f to the fixed contact 25b based on the rotation speed setting signal 15a, the rotation speed is set from high speed to low speed. Further, the variable resistor 26 may be constructed from a combination of a switching element such as a semiconductor element and a resistor, and the resistance value thereof changes based on the pulsating signal 15b, thereby increasing the power supply to the blower 5. The voltage can be varied.

For example, as shown in FIG.
6 as an input line 26a to which no resistor is connected;
It consists of an input line 26b to which a resistor r is connected, and a relay 26x that switches these input lines 26a and 26b, and the relay 26x is turned on and off by the pulsation signal 15b to change the current and voltage input to the blower 5. to generate pulsation.

The operation of the vehicle air conditioner with the above configuration will be explained. When the temperature inside the vehicle is high in the summer, etc., when the air conditioner switch (not shown) is turned on and the control device 15 is activated, the control device 15 closes the inside/outside air switching door 3 in order to rapidly cool the air conditioner.
is set to the inside air introduction mode, the air mix door 8 is set to the full cooler mode, and the compressor (not shown) is fully rotated. As a result, when the temperature inside the vehicle gradually decreases as shown in characteristic A in FIG. is switched from the fixed contact 25f to the fixed contact 25b. As a result, the rotational speed of the blower 5 is gradually lowered from the high rotational speed H to the low rotational speed L as shown in characteristic C. In addition, the control device 1
5, the movable contact 25a is the fixed contact 25e, 25d,
25c, that is, the rotation speed of the blower 5 is set to M ₁ , M ₂ , M ₃ by the rotation speed setting device 25.
When the pulsation signal 15b is set to
supply to. In this case, as the rotational speed is set in the M ₁ to M ₃ direction, the rate of decrease in the input current and voltage that occurs when the variable resistor 26 is switched by the pulsation signal 15b becomes smaller. That is, since the difference between the maximum value and the minimum value of the input current voltage to the blower 5 becomes smaller, the amplitude S gradually becomes smaller.

As a result, the number of rotations of the blower 5 increases.
When the rotation speed is set to M ₁ to _{M 3} , the air pulsates around this rotational speed, and the blown air becomes a pulsating wave.

Therefore, during rapid cooling, the blown air becomes pulsating waves, and the cold air is blown with varying degrees of strength, thereby providing a great cooling sensation. Furthermore, since the pulsating waves are blown onto the face, the face is not unnecessarily cooled, and the user can maintain a good physical condition. In addition, according to this embodiment, the amplitude of the pulsating wave is reduced as the blower is set to a low speed rotation direction, and it is set so that it does not pulsate at low speed L, so when the temperature inside the vehicle is low. It is possible to solve the problem of causing discomfort due to the pulsation of the blown air, which disturbs the low-temperature air in the vehicle interior.

In other words, in Utility Model Publication No. 53-20107, the number of rotations of the blower is pulsated during cooling to make the blown air into pulsating waves. If the fan's rotational speed is pulsating until the air blower's rotation speed is pulsating, it will give the occupants a feeling of coldness, which is not good for their health, and may also cause fluctuations in the fan's rotational speed.
Fluctuations in the blown air distract the driver's attention, which is not good for safe driving. However, this problem can be solved by reducing the pulsation in the direction of low speed rotation as in the present invention.

In the present invention, as shown in Fig _. 4, each resistor 21 _{to 2}
By setting the resistance value of 4, the air blowing speed during rapid cooling can be made faster, and rapid cooling can be achieved more effectively.

The pulsating wave is not limited to one whose amplitude changes regularly, and the variable resistor 26 is connected to the input lines 26a to 26d with different resistances r ₁ as shown in FIG.
A rotary switch _26y is provided which connects the input lines 26a to 26d and switches the input lines 26a to 26d sequentially, and switches the rotary switch 26y one pitch at a time each time the pulsation signal 15b is input. As shown in P, the rotational speed of the blower may vary irregularly around the reference rotational speeds M ₁ , M ₂ , M ₃ as shown in P, so that air close to natural wind is blown out. .

In addition, although the input current and voltage of the variable resistor 26 is changed using a relay 26x that is turned on and off by the pulsating signal 15b, as shown in FIG. may be input to the base B of this switching transistor 26t to change the input current voltage to the blower 5.

Furthermore, as shown in Fig. 6, in a control method in which the rotation speed of the blower is continuously changed from high speed rotation to low speed rotation as the temperature inside the vehicle decreases, the rotation speed is continuously changed. In the process, the rotational speed of the blower may be pulsated to form pulsating waves. In addition, in mid-seasons such as spring and autumn, the opening degree of the air mix door is set so that when the air volume increases due to the pulsating rotation speed of the fan as shown in Figure 7 a and b, the air outlet temperature becomes higher. The opening degree is set so that the blowout temperature decreases when the air volume decreases, and by swinging the air mix door in response to fluctuations in the fan speed, more effective rapid cooling can be achieved. It can sometimes give a feeling of cooling.

As explained above, according to the vehicle air conditioner according to the present invention, there is provided a rotation speed control means for setting the rotation speed of the blower from a high rotation speed to a low speed rotation direction as the temperature in the vehicle interior decreases; and a pulsation setting means for controlling the blowing air obtained by the rotation of the blower to form a pulsating wave by varying the power supply voltage of the blower in the process in which the rotation speed of the blower changes to a low speed rotation direction. Therefore, it is possible to more effectively provide a feeling of cooling, and it is also possible to eliminate the discomfort caused by cold air being blown onto the occupant at a constant blowing speed.

[Brief explanation of the drawing]

Figure 1 is a diagram showing changes in the rotational speed of a blower controlled by a conventional vehicle air conditioner;
Figure 3 is a block diagram and circuit diagram showing an embodiment of the vehicle air conditioner according to the present invention, Figure 4 is a characteristic diagram for explaining the operation of the vehicle air conditioner according to the present invention, and Figure 5 is a characteristic diagram for explaining the operation of the vehicle air conditioner according to the present invention. 7 to 7 are characteristic diagrams for explaining other embodiments of the vehicle air conditioner according to the present invention, FIG. 8 is a circuit diagram of a variable resistor,
9 and 10 are circuit diagrams of variable resistors of other embodiments. 3...Internal/internal air switching door, 4, 14...Actuator, 5...Blower, 6...Evaporator, 7
... Heater core, 8 ... Air mix door, 15
...Control device, 20...Drive circuit, 25...Rotation speed setting device, 26...Variable resistor.

Claims (1)

[Scope of claim for utility model registration] (1) A blower, an evaporator that cools the air introduced by the blower, a heater core, a means for adjusting the mixing ratio of cold air and warm air, and an output of a vehicle interior temperature sensor. a rotational speed control means that operates based on the rotation speed and changes the rotational speed of the blower from a high rotational speed to a low rotational speed when the vehicle interior temperature decreases during cool-down; A vehicle air conditioner comprising a pulsation setting means that pulsates the voltage applied to the blower when the blower is controlled toward a low rotational speed, and controls the width of the pulsation to decrease with the rotational speed. . (2) The vehicle according to claim 1, wherein the pulsation setting means is a variable resistor connected to the power supply circuit of the blower and whose resistance value changes based on a pulsation input signal whose amplitude varies. air conditioning equipment.