KR880000916B1 - Control device of ventilating apparatus in a vehicle - Google Patents

Abstract

This control system can adjust the rotational level of the blower according to the on/off state of an air conditioner switch. The motor of blower (18) is grounded through the serially connected resistances (19)(20)(21). The blower has several rotational levels, i.e. the low speed level, the middle low speed level, the middle high speed level, the high speed level. With the air conditioner switch on, the transistor turns off and the operational level of the third comparator (13) is set on the input reference voltage.

Description

Blower controller of vehicle air conditioner

1 is a diagram showing temperature control characteristics of an example of a blower control device of a conventional vehicle air conditioner.

2 is a circuit diagram showing an embodiment of a blower control device for a vehicle air conditioner according to the present invention.

3 is a diagram showing control characteristics for explaining the temperature control operation of the FIG.

* Explanation of symbols for main parts of the drawings

3: Temperature setter 4: Air temperature sensor

18: blower 28: air corner switch

40: calculation unit 50: control unit

60: suppression unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower control device for a vehicle air conditioner, and more particularly, to an adjustable level of rotation of a blower in an on-off state of an error cone switch. A vehicle air conditioner includes a blower that introduces air into the duct from an internal and external air switching door shaft, an evaporator that cools the air, a heater core that heats the air, and an air mixer door that adjusts the mixing ratio of cold air and warm air. It is provided.

In the case of an air purifier for a vehicle equipped with an automatic echo function, the difference between the set temperature set by the temperature setter and each temperature detected by the air temperature sensor, the outside temperature sensor, and the solar temperature sensor is detected. The rotational speed of the blower and the position of the air mixer door are automatically controlled by a synthetic signal obtained by the old car. In such a device, as indicated in the first building, as the outside air temperature is low, the interior of the vehicle is warmed, and the set temperature of the temperature setter is sequentially set in the high temperature direction, the difference between the total signal T becomes small and the blower rotates at low speed. From low to medium low speed level, medium to high speed level, high speed level.

If the outside air temperature is high and the set temperature of the temperature setter is set in the low temperature direction in order to cool the vehicle interior, the value of the sum signal T becomes large, so that the blower starts from the low speed level, the low speed level, and the high speed level, as described above. It is controlled sequentially at the high speed rotation level. So in full heater mode FH and in full cooler mode FC. In either case, the blower is at a high speed rotation level.

In the case of the full cooler mode FC, when the blower is at a high rotational speed, the cooler is blown into the vehicle at a high speed, which is preferable because it gives the passengers more cooling. However, if the blower reaches the high rotational speed during the full heater mode FH, the outside air is introduced into the duct of the apparatus at high speed, and is blown out after being heated by the heater core. The air temperature blown out by it lowers and gives an unpleasant feeling to a passenger. This is a particularly important problem in an air conditioner having a small heater core.

Thus, when the air mixer door is opened in the direction of the full heater mode as described in Japanese Laid-Open Patent Application No. 57-41367, it is detected by the detection switch so that the blower does not rise to the high speed rotation level. As described in the above, the resistance and two switching switches are connected in parallel during the period and the blowing period, and the switch is connected to the internal and external air switching lever and the mode switching lever respectively to supply the driving current to the blower through this resistance during full heater mode. It is proposed that the blower does not rise to the high speed rotation level.

However, these conventional techniques require a linkage mechanism between a switch or a lever that detects the opening degree of the air mixer door, and thus has a disadvantage in that the structure becomes complicated and the cost increases. Therefore, the present invention focuses on the fact that the air count switch is turned off during the heater heater, and the structure is simplified to suppress the blower from rising to the high-speed rotation level during the full heater mode by the signal at the time of the off heater. An embodiment of will be described in detail.

2 is a circuit diagram showing an embodiment of a blowing control device for a vehicle air conditioner according to the present invention, in which FIG. 1 shows that the addition circuit 7 is an absolute value circuit and in this embodiment, both circuits 1 And (7), the calculation unit 40 is configured. The addition circuit 1 is composed of an operational amplifier 2, etc., which is normally located near the instrument panel in the vehicle's interior and sets the temperature in the interior by the operation of the passenger. Room temperature tr, outside air temperature ta, and insolation temperature ts respectively detected by the TD, the air temperature sensor 4, the outside air temperature sensor 5, and the solar radiation temperature sensor 6 which set the temperature inside the vehicle interior. The sum signal T is calculated by the following equation.

(atr + bta + cts) -dTD = T

Where a, b, c and d are integers.

In order to detect the absolute value of the sum signal T according to the value of each temperature tr, ta, ts, and the sign of the value is positive or negative, the differential signal 8 of the absolute value circuit 7 is used. Are supplied to the inverting input side and the non-inverting input side of the differential amplifier 5 for processing. Thus, when the value of the total signal T is positive, the signal TV of positive value proportional to the absolute value of the total signal T is output from the differential amplifier 9, and when the value of the total signal T is negative, the total signal T is negative. A signal TV of positive value proportional to the absolute value of is output from the differential amplifier 8. In Fig. 3, the straight line F indicates the change of this signal TV value.

The output signal TV from the automatic amplifier 8 or 9 is supplied to the non-inverting input side of the first to third non-interference paths 11-13 constituting the comparison circuit 10.

When the value of the signal TV rises above the predetermined value TV ₁ , the _{first non-} converter 11 inverts the output to a high level so that the reference input voltage value is set to a value that turns on the transistor 15 of the driver circuit 14. When the signal TV exceeds the predetermined value TV ₂ higher than the predetermined value TV ₁ , the second non-conducting path 2 sets the predetermined value TV higher than the predetermined value TV _{2. When} it exceeds ₃ , the respective outputs are inverted to a high level, and the respective reference input voltage values are set to values for turning on the transistors 16 and 17.

A motor (not shown) of the blower 18 is grounded through the resistors 19, 20, and 21 connected in series, and the blower 18 is a total resistor 19, 20, ( 21 is connected to the ground to the low speed rotation level, the relay 23 is biased and the contact 22 is switched to the fixed contact 22c to the medium low speed rotation level, the relay 25 is biased to the contact ( When 24 is switched to the fixed contact 24c, it is set to the high speed rotation level, and when the relay 27 is boosted to 26c, it is set to the high speed rotation level, respectively. Relays 23, 25, and 27 are energized at the ON of transistors 15, 16, and 17, respectively.

Reference numeral 28 denotes an air corner switch, which is turned on to operate a compressor driving circuit (not shown) to drive a compressor (not shown) of the air conditioner. In the present invention, the air cock switch 28 further turns off by controlling the base potential of the transistor 30 of the rotation speed suppression circuit 29 constituting the suppression section 60 which suppresses the rotation speed of the blower 18. The lower surface of the transistor 30 is turned on, and the non-inverting input of the third non-intersection 13 connected to the collector of the transistor 30 via the diode 31 is lowered to the ground potential. For this reason, when the air-con switch 28 is off, the output of the 3rd non-comparison 13 is always maintained at low level.

The operation of the blower control device of the vehicle air conditioner according to the above configuration will be described with reference to FIG. When the air counch 28 is on, the transistor 30 is turned off and the operating level of the third non-intersection 13 is set to a predetermined reference input low voltage value. In this case, the non-inverting input side of the comparison circuit 13 does not become higher than this predetermined reference input voltage value due to the presence of the diode 31. Therefore, when the sum signal T takes the predetermined reference value To, the signal TV value is extremely small and is lower than the lowest predetermined value TV ₁ , so that the outputs of the first to third non-transfer paths 11, 12, and 13 are All are at low level, and since the blower 18 is connected to ground via all the resistors 19, 20, and 21, it becomes low speed. In any case, as the total signal T increases or decreases from the predetermined reference value To, the signal TV value increases, so that the outputs of the first non-crossing path 11, the second non-crossing path 12, and the third non-crossing path 13 are in this order. The sequential output is reversed to that level, and the blower is sequentially set to low to medium low speed level, medium to high speed level, and high speed level.

The case where the total signal T increases or decreases from the predetermined reference value To means that the temperature setter 3 is operated in the direction of increasing the vehicle temperature from the predetermined position (the TD value is set to a higher value) or This is a case where the room temperature is manipulated (TD value is set to a lower value) from this predetermined position, and the setting position of the temperature setter 3 does not change (TD value does not change). ), The room temperature tr, the outside temperature ta and the solar temperature ts rise or fall, and the difference T between the temperature rise and the set temperature TD changes in the direction of increase or decrease based on the predetermined reference value To. When the signal TV value decreases, the rotation speed level of the blower 18 changes in the reverse direction to the above. In addition, rotations adjacent to each other which give a constant hysteresis to the output inversion by the diodes D1, D2, and C3 between the output side and the inverse input side of the comparison circuits 11, 12, and 13 A level shift P is given to the level at the switching timing from one side to the other and the other side to the side to prevent the hanging. Moreover, according to the compressor turning on / off, a certain shift is given to the blower 18 from the high speed rotation level to the high speed rotation level, and the switching timing from the latter to the former.

However, when the air count switch 28 is turned off, the transistor 30 is turned on and the output of the comparison circuit 13 is set at a low level irrespective of the value of the input signal TV. Thus, the transistor 17 is turned off and the relay 27 is turned off. Is off. Therefore, the contact 26 is not connected to the fixed contact 26c, and the blower 18 is not set to a high speed rotation level. In other words, since the air conditioning switch 28 is turned off when the air conditioner is completely heated, the air cone switch 28 is turned off during the full heating mode, and the blower 18 is operated at a high or low rotational speed. It is suppressed by a small amount of hostility, and the heater core can fully heat the introduced air, it can blow out the air heated enough, and can give a passenger a feeling of heating.

Thus, the above effect can be obtained only by adding the rotation speed suppression circuit 29 to the rotation speed and the suppressing circuit of the blower 8, and in the case of obtaining the conventional effect, for example, the Japanese In the actual location 54-166646, it was necessary to move the exercise device for mechanical movement between the switch and the motor switching lever separately, but the present invention is simpler in configuration as described above. Miniaturization is possible.

Further, in the above-described embodiment, the blower is rotated in accordance with the calculation of the difference between the set points of the temperature setter, the inside temperature (indoor temperature), the outside temperature and the solar temperature, and the calculation of the difference between the fires. Although a configuration has been described in which the control for changing the number from the low speed rotation level to the high speed rotation level or the reverse direction thereof is performed in an analog manner, the present invention is not limited thereto, and the first parameters such as the above temperature values are passed through the AD converter. It is a matter of course that the present invention may be applied to a configuration using a micron computer that inputs and performs the continuous shooting and control in a digital manner based on these parameter values.

As described above, according to the present invention, since the blower is prevented from reaching the high-speed rotation level by the output signal from the switch when the air corner switch is turned off, it is possible to give the passenger a sufficient heating feeling during the full heating mode. It can be realized by a simple circuit configuration, and the cost can be reduced.

Claims (1)

Air compressor switch 28 for driving the compressor during on operation, temperature setter 3 for setting the temperature in the vehicle interior, air temperature sensor 4 for detecting the temperature in the vehicle interior, and The rotation speed of the blower 18 is controlled from the low rotational speed level to the high rotational speed as the calculated value according to the difference between the detected values and the calculating unit 40 and the calculated value change in the increasing direction based on the predetermined value. In the blower control apparatus for a vehicle air conditioner having a control unit 50, the number of revolutions of the blower 18 is set to a predetermined value lower than the high-speed rotation level by an off signal from the air cock switch 28. And a suppressor (60) for suppressing the blower controller of the vehicle air conditioner.

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