JPS582850B2 - Shyariyouyoureibo Sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to improve the feeling of cooling when cooling an automobile cooling system.

2. Description of the Related Art Conventionally, commonly used vehicle cooling systems cool the interior of a vehicle by sucking air inside the vehicle and cooling it through a cooler, and then blowing the cooled air back into the interior of the vehicle.

The volume of cold air blown out at this time can be changed to three levels: strong, medium, and weak using a switch.

However, during long-term operation, the air conditioner has the disadvantage that the feeling of cold air deteriorates over time if the air conditioner becomes accustomed to a constant flow rate and constant air direction.

Therefore, it has been proposed to maintain the feeling of cold air by automatically changing the wind direction of the air outlet.

This is a device that automatically changes the wind direction by using power from a motor or the like to automatically change the wind direction plate attached to the air outlet of the air conditioner.

However, this method requires a complicated mechanism at the outlet, so
It has the disadvantage that it is not particularly suitable for use in vehicles that experience a lot of vibration.

In view of the above-mentioned problems, the present invention provides a cooling device that is effective for use in vehicles that vibrate a lot, and that uses an electric circuit to improve the feeling of cooling during long-term driving, which is a requirement of the present invention.

First, a control device for a vehicle air conditioner according to the present invention will be explained using a block diagram.

As shown in FIG. 1, a key switch 2 of the vehicle is connected to a battery 1 that is a power source for the vehicle.

Connected to the key switch 2 is a changeover switch 3 (not shown) that serves both as a power switch for the cooling device and for adjusting the speed of the blower.

This changeover switch 3 is branched into two directions, and one side is connected to a resistor 4 for changing the rotational speed of a blower 6, which will be described later, and a converter 5 and a blower 6, which operate according to the present invention, are connected in series. ing.

The other branched by the changeover switch 3 detects the temperature of a cooler (not shown) or the air temperature immediately after the cooler,
It is connected to a thermoswitch 7 that connects and disconnects a compressor (not shown), and the output of the thermoswitch 7 is connected to a magnetic clutch 8 attached to the compressor (not shown).

Further, a comparator 9 is provided which inputs the combined voltage of the temperature detecting section and the temperature setting section of the thermoswitch 7, and the comparator 9 has a reference voltage.

Further, the output of the comparator 9 is connected to the power supply of the oscillation circuit 10.

The output of the oscillation circuit 10 is connected to the converter 5.

The oscillation circuit 10 also includes a circuit that detects that the changeover switch 3 is in a position where the blower 6 is rotated at high speed.

The operation of the control device for a vehicle air conditioner according to the present invention configured as described above will be explained.

First, the key switch 2 of the vehicle is closed, and the changeover switch 3 is closed.

At this time, the contact position is set at a high speed of the blower rotation speed, the resistor 4 directly energizes the converter 5 without passing through the resistor, the converter 5 closes the contact as described later, and the blower 6 is energized. rotates at high speed.

At the same time, the thermoswitch γ is energized, the magnetic clutch 8 is attracted by the output of the thermoswitch 7, and the compressor is driven by the engine of the vehicle (not shown).

Therefore, the air conditioner starts cooling operation at the maximum cooling capacity.

The comparator 9 compares the combined voltage change of the temperature detection section and temperature setting section of the thermoswitch with a reference voltage,
The reference voltage is designed to have approximately the same value as the voltage near the thermoswitch 7 at which the output of the thermoswitch 7 is switched on and off by the temperature detecting section and the temperature setting section.

When the cooling operation continues and the combined voltage of the humidity detection section and the temperature setting section of the thermoswitch 7 becomes higher than the reference voltage of the comparator 9, the comparator 9 is activated and the oscillation circuit 10 is activated.
supply power to the

The oscillation circuit 10 generates internal oscillation and operates the converter 5 with its output.

At this time, the oscillation circuit 10 operates the converter 5 as described above when the changeover switch 3 is at the contact position that rotates the blower 6 at high speed.

The rotation speed of the blower 6 can be easily changed by using a converter 5 in which a contact point and a resistor are connected in parallel.

Therefore, even during long-term operation, when the humidity reaches the point where the thermo switch activates, the air conditioner's air output will automatically cycle between strong and weak winds, allowing you to enjoy a pleasant cooling sensation similar to that of natural wind. .

Further, since the blower 6 continues to rotate at high speed until the temperature reaches the point where the thermo switch 7 is activated, the initial cooling effect is not impaired.

When the heat load becomes large due to sunlight etc. while the vehicle is running, the thermo switch 7 will remain attracted to the magnetic clutch 8, the comparator 9 will cut off the power to the oscillation circuit 10, and the blower will automatically shut down. Continue to rotate at high speed.

Therefore, since the cooling operation returns to the maximum capacity, the function will not be impaired even when the heat load fluctuates.

One embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 2, a key switch 2 of the vehicle is connected to a battery 1 that is a power source of the vehicle.

The key switch 2 is connected to a power terminal B of the changeover switch 3.

The H, M, and L terminals of the changeover switch 3 are a high speed contact, a medium speed contact, and a low speed contact of the blower drive motor 6a, respectively.

This H. The M and L terminals are connected to the resistor 4, and the H terminal is connected in series with the blower drive motor 6a without passing through the resistor, the M terminal is connected in series with the resistor 4a, and the L terminal is connected with the resistor 4a. They are connected in series through a resistor 4b.

A converter 5 is connected in series between the resistor 4 and the blower drive motor 6a.

This converter 5 has a normally closed contact portion 5a and a resistor 5b connected in parallel.

This resistor 5b is designed to be the sum of the resistors 4a and 4b of the resistor 4, that is, approximately the same value as that at the time of low-speed contact switching.

The blower drive motor 6a is connected to ground.

On the other hand, the P terminal of the changeover switch 3 is a continuous contact.

That is, the contacts to the blower drive motor 6a are connected to H and M.
, L, the power is continuously supplied to the P terminal side.

The P terminal of the changeover switch 3 is connected to the power source of the thermoswitch 7 and the comparator 9, and is also connected to a relay contact 7a driven by the thermoswitch 7.

The relay contact 7a and the magnetic clutch 8 are connected in series, and the magnetic clutch 8 is further connected to ground.

The thermo switch 7 includes a temperature detection section 11 and a temperature setting section 12.
The temperature detection section 11 uses a material whose resistance value changes depending on temperature, such as a thermistor, and the temperature setting section 12
uses a variable resistor.

Further, the resistors 13, 14, 15, the sensor 11, and the variable resistor 12 are connected in series to form a bridge circuit.

A connection point (point C) between the resistor 13 and the sensor 11 of this bridge circuit is connected via a resistor 16 to an inverting input of an operational amplifier 20 that performs an amplification action.

Also, the connection point (point D) between resistor 14 and resistor 15 is connected to resistor 17.
It is connected to the non-inverting input of the operational amplifier 20 via.

Further, the non-inverting input terminal and output terminal of the operational amplifier 20 are connected via a resistor 18.

Further, the output terminal of the operational amplifier 20 is connected to the base of a transistor 21 via a resistor 19.

This transistor is of NPN type, and its collector is connected to a power source via a relay coil 22.

A diode 23 is connected in parallel with this relay coil.

Further, a diode 41 is connected between the power supply and ground.

The inverting input terminal of the operational amplifier 28 of the comparator 9 is connected to the point C of the thermoswitch 7 via the resistor 26 .

Further, it is connected in series with resistors 24 and 25, and the non-inverting input terminal of an operational amplifier 28 is connected to the connection point (point F) of the resistors 24 and 25 via a resistor 27.

The output terminal of the operational amplifier 28 is connected to a power supply via a resistor 29, to ground via a resistor 30, and to the base of a transistor 31.

The transistor 31 is of a PNP type, and has an emitter connected to a power supply and a collector connected to a power supply of the oscillation circuit 10.

In the oscillation circuit 10, the emitters of NPN transistors 38 and 39 are each connected to ground, and the collectors are connected to a power supply via resistors 32 and 35, respectively.

Further, the bases of transistors 38 and 39 are connected to a power supply via resistors 34 and 33, respectively.

Capacitors 36 and 37 are connected across the collectors and bases of these transistors 38 and 39, respectively.

Further, the collector of the transistor 39 is connected to the base of a transistor 41 via a resistor 40.

The transistor 41 is of NPN type, and its emitter is connected to ground.

On the other hand, the collector is connected to a portion connected to the H terminal of the selector switch 3 via a series connection of a resistor 42 and a Zener diode 48, and at the same time is connected to the base of a transistor 44 via a resistor 43.

The transistor 44 is of the NPN type, and has an emitter connected to ground and a collector connected to a power source via a relay coil 45.

A diode 46 is connected in parallel with this relay coil 45.

The operation of the embodiment of the present invention constructed as described above will be explained.

First, the key switch 2 of the vehicle is closed, and the changeover switch 3 is set to the solid line position.

Therefore, the B terminal, H terminal, and P terminal of the changeover switch 3 are connected, and power is supplied.

Electricity is applied directly to the converter 5 from the H terminal of the changeover switch 3 without passing through the resistance part of the resistor 4, and the normally closed contact part 5a of the converter 5
The blower drive motor 6a is energized through the.

Therefore, the blower drive motor 6a rotates at high speed.

At the same time, the thermoswitch 1 is energized from the P terminal of the changeover switch 3.

The thermo switch 7 uses a series circuit of a variable resistor 12, which is a temperature setting section that sets the temperature desired by the occupant, and a thermistor 11, which is a temperature detection section that detects the cooler temperature, to generate a divided voltage with a resistor 13. Occurs at point C.

At the same time, a divided voltage with resistors 14 and 15 is generated at point D, and C
The operational amplifier 20 that receives the voltages between the points and the points D switches.

This operational amplifier 20 constitutes a Schmitt circuit together with resistors 16, 17, and 18.

Therefore, if the voltage at point C drops with respect to the voltage at point D, the operational amplifier 20 switches and conducts current to the base of the transistor 21 via the resistor 19, and vice versa. If the voltage increases, the current to the transistor 21 is cut off.

At this time, since the operational amplifier 20 operates as a Schmitt circuit, it switches with some hysteresis with respect to the voltage at point D.

Therefore, when the voltage at point C drops below the voltage at point D, the transistor 21 is energized, and when the voltage at the point C slightly rises above the voltage at point D, the transistor 21 is turned off.

The hysteresis can be adjusted by resistor 18.

Transistor 21 drives relay coil 22.

The diode 23 is for absorbing surges of the relay coil 22.

Relay coil 22 opens and closes its relay contact 7a.

Now, the variable resistor 12 is set at an arbitrary position, and the thermistor 11 is detecting the cooler temperature.

When the temperature detected by the thermistor 11 is higher than the temperature set by the variable resistor 12, the resistance value of the thermistor 11 is small, so the voltage at point C is lower than the voltage at point D, and the operational amplifier 20 switches and the transistor 21 energize.

Therefore, the transistor 21 becomes conductive, and the relay coil 2
2 is energized, the contact 1a is attracted, the magnetic clutch 8 is attracted, and the compressor is operated.

Therefore, cooling operation is started.

Furthermore, when the temperature set by the variable resistor 12 and the depth detected by the thermistor 11 become equal, in other words, when the voltage at point C becomes higher than the voltage at point D, including hysteresis, the operational amplifier 20 Since the current is cut off, the transistor 21 becomes non-conductive, and the relay coil is cut off, so the contact 7a is opened and the combustor is stopped.

At this time, the comparator 9 detects the voltage at point C.

The comparator 9 uses the voltage divided by the resistors 24 and 25 as a reference, and is connected to the non-inverting input of the operational amplifier 28.

The operational amplifier 28 constitutes a comparator together with the resistors 26 and 27, and compares the reference voltage (point F) with the voltage at the point C of the thermoswitch 7.

Here, the voltage at point F is adjusted to approximately the same value as the voltage at point D of the thermoswitch 7 by resistors 24 and 25.

Therefore, at the start of cooling operation, since the voltage at point C of the thermo switch 7 is lower than the voltage at point F, the operational amplifier 28
The transistor 31 is energized.

Therefore, the base voltage of transistor 31 increases, and transistor 31 becomes non-conductive.

Further, when the temperature detected by the thermistor 11 of the thermoswitch T decreases, the resistance value of the thermistor 11 increases, and the voltage at point C increases.

When the voltage at the point C rises above the voltage at the point F of the comparator 9, the operational amplifier 28 cuts off the current to the transistor 31.

Therefore, the base voltage of the transistor 31 decreases because it is grounded by the resistor 30, and the transistor 31 becomes conductive and supplies power to the oscillation circuit 10.

The oscillation circuit 10 includes resistors 32, 33, 34, 35, capacitors 36, 37, and transistors 38, 39 to form an astable multi-by-break.

This astable multi-by-break starts oscillating as soon as the power is turned on.

The oscillation frequency of this astable multi-by-break can be freely adjusted by changing the values of the resistors 33 and 34 and the capacitors 36 and 37.

This oscillated signal is passed through a resistor 40 to a transistor 4.
1 and activates transistor 41.

The operation of this transistor 41 is conducted to a transistor 44 via a resistor 43.

At this time, the Zener diode is connected to the H terminal of the selector switch 3 via the resistor 42 and the Zener diode 48, so when the selector switch 3 is connected to the H terminal, the Zener diode becomes conductive and the resistor is applied to the transistor 41. 42, and when the selector switch 3 is connected to the M or L terminal, the resistor 4a of the resistor 4 or 4a and 4
Since the voltage drops due to the combined resistance of b, and the Zener diode 48 is designed so as not to rise to the Zener voltage of the Zener diode, the transistors 41 and 48 are no longer energized, and the transistor 4
The base voltage of transistor 44 drops and transistor 44 becomes non-conductive.

Therefore, the transistor 44 operates only when the changeover switch 3 is connected to the H terminal as in the previous example, and becomes non-conductive when the changeover switch 3 is connected to the M1 or L terminal.

Therefore, since the relay coil 45 driven by the transistor 44 operates in the same manner as the transistor 44, the relay contact 5a of the converter 5 also operates in the same manner.

However, since the relay contact 5a operates as a normally closed contact,
It operates with a phase shift of 180 degrees.

That is, when the transistor 44 becomes conductive, the relay contact 5a becomes open.

Further, the diode 46 is for absorbing surges of the relay coil 45.

As described above, the changeover switch 3 is connected to the blower drive motor 6.
It is connected to the H terminal that rotates the compressor at high speed, and when the temperature reaches a point where the thermo switch 7 stops the compressor, the rotation speed of the fan changes periodically, so the air blowing from the air conditioner changes in strength and weakness periodically. Becomes the wind.

Further, in the embodiment, the converter was connected between the resistor 4 and the blower drive motor 6a, but the same effect can be provided anywhere in the series closed circuit of the power supply, changeover switch 3, resistor 4, and blower drive motor 6a. Effects can be obtained.

As described above, the present invention has the following excellent effects.

(1) Since the rotational speed of the blower changes periodically and the blowing air changes periodically, the cooling sensation is not impaired even during long-term operation.

(2) When the thermo switch is activated and the temperature reaches a level close to stopping the compressor, the rotational speed of the blower changes periodically, so the initial cooling effect is not impaired.

(3) In order to change the blower periodically when the changeover switch is rotating the blower at high speed, the resistor 4 and converter 5 are equipped with a resistor when the switch is operating at the medium speed or low speed contact position. It is possible to prevent abnormally low rotation of the blower that occurs due to the composite value of , and it is possible to constantly provide a feeling of cold air.

(4) Since the cooler outlet has the same conventional structure and consists only of an electric circuit, there are no restrictions during installation or against vibration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the present invention, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. In the figures, the same symbols indicate the same products or the same functions. 1 is the battery, 2 is the key switch, 3 is the changeover switch,
4 is a resistor, 5 is a converter, 6 is a blower, 7 is a thermoswitch, 8 is a magnetic clutch, 9 is a comparator, and 10 is an oscillation circuit.

Claims (1)

[Claims] 1. A blower speed adjustment circuit that includes a changeover switch, a resistor, and a fan mask, a thermoswitch that detects the air mixture immediately after the cooler and switches the compressor on and off, and a compressor control circuit that includes a magnetic clutch driven by the thermoswitch. In the vehicle cooling system, the blower speed adjustment circuit is provided with a converter that periodically changes the blower speed, and a signal for switching the changeover switch to high speed rotation, a mixture setting section of the thermoswitch, and a temperature control circuit are provided. A vehicle cooling device characterized in that a front converter is driven by a signal from a detection section.