JPS6229283Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a vehicle air conditioner.

In the known air mix type car air conditioner system, as shown by the arrow in the system diagram in Figure 1,
The air that has been circulated or introduced from the outside by the inside/outside air switching damper 1 passes through the cooling heat exchanger 4 by the fan 2 driven by the fan motor 3, and then is converted into heating heat using hot water as the heat source by the air mix damper 5. The air is divided into air passing through the exchanger 6 and air bypassing the heating heat exchanger 6, and the two airs are mixed and temperature-controlled downstream. 7,8
are blow-off mode dampers for branching out the air after air mix to the ventilation duct 9, the footwell blow-off duct 10, the rear seat footwell blow-off duct 11, and the defroster duct 12, respectively. is blown into the vehicle interior 13 through each blow-off duct according to the passenger's preference.
Regarding the air mix damper 5 in the above diagram, the symbol H indicates the MAX HOT position and the symbol C indicates the MAX COOL position.

Conventionally, in this air mix type car air conditioner system, as shown in the control circuit diagram in Figure 2, when the ignition switch 15 of the vehicle is turned on, the relay 16 for the fan motor 3 is energized by the power battery 14, and the relay contact 19 is closed, and when the fan switch 20 is turned to L (low speed), the power supply battery 14, the fuse 18, and the fan switch 2
0, the fan motor 3 is driven through the resistors 21 and 22, and the fan 2 rotates at a low speed. Even when the fan switch 20 is set to M (medium speed) or H (high speed), only the resistor 22 or the resistor 21,
Voltage is applied to the fan motor 3 without passing through 22,
The fan 2 will transfer air at medium or high speed.

The air conditioner switch 23 turns on and off the compressor magnetic clutch 27, and at the same time controls the idle speed control solenoid valve 28 connected in parallel with the magnetic clutch 27.
ON OFF control. 24 is a thermostat that prevents the cooling heat exchanger 4 from freezing; if the air conditioner switch 23 is closed and the thermostat 24 is closed,
The magnetic clutch relay 25 is energized, the relay contact 26 is closed, and the magnetic clutch 2
7 is connected to the compressor, and the compressor will rotate. On the other hand, the idle speed control solenoid valve 28 is turned on and the idle speed increases.

As mentioned above, in conventional fan speed control, if the fan switch 20 is set to L, M, or H, the temperature of the cooling heat exchanger 4 or heating heat exchanger 6 (or Since the fan rotates at a set fan speed without depending on the air temperature, it has the disadvantages described below.

(1) If the car is parked for a long time during the summer day, the cooling heat exchanger 4 will not be sufficiently cooled immediately after the cooler is turned on (air conditioner switch 23 is turned on), and as soon as the fan switch 20 is turned on, the temperature will be relatively far from the comfortable temperature. Hot wind blows into the car.

In addition, since the surface of the heat exchanger was not sufficiently moistened, dust, dirt, etc. on the surface of the heat exchanger and in the ducts were blown into the interior of the vehicle 13, creating an unpleasant feeling including the smell of the air conditioner.

(2) In winter, when the engine is warmed up immediately after the engine is started, and the engine cooling water temperature is low, the temperature blown out from the heating heat exchanger 6 is low (far from a comfortable temperature) and makes the engine feel uncomfortable.

In response to these drawbacks, conventional methods, for example,
When the fan switch 20 is turned on, the fan does not rotate.
There is a method that activates a timer and rotates at a set speed after a certain period of time has passed, but there is no relationship between the timer and the comfortable air outlet temperature, and even if the fan switch 20 is turned on, fan 2 does not turn, and suddenly after a certain period of time has elapsed. Fan 2 started blowing air at the set rotation speed, which gave the occupants a sense of uneasiness and was not favorable in terms of noise and feeling.

In addition, it senses the air temperature, engine water temperature, etc. at the cooling heat exchanger 4, heating heat exchanger 6, or immediately after that, and turns off the fan until they reach the set temperature.
Alternatively, there have been proposals to blow air at a low speed and then at a set speed when the set temperature is reached, but as mentioned above, the fan suddenly starts rotating, which gives a sense of uneasiness to the occupants and is not desirable in terms of noise feeling. Ta.

The present invention was proposed in view of these circumstances, and is an air conditioning system for vehicles that prevents hot air and odors from being blown out at the start of summer cooling operation, and also prevents cold air drifting at the start of winter heating operation. A first temperature sensing element attached to or near the evaporator to detect the evaporator temperature or air temperature near the evaporator, and a first temperature sensing element attached to or near the heater core to detect the heater core temperature or air temperature near the heater core. The outputs of the second temperature sensing element and the first and second temperature sensing elements are selectively inputted through a switching circuit, and the fan is operated until each of the selected temperature sensing elements detects its set temperature. The fan is characterized in that it includes a rotation speed continuous control electronic circuit that gradually increases the speed of the fan and rotates the fan at a predetermined speed after reaching the set temperature.

An embodiment of the present invention will be explained with reference to the drawings.
Figure 3 is its control system diagram, Figure 4 is an enlarged circuit diagram of the fan controller in Figure 3, and Figures 5 and 6.
The figures show the characteristics of the temperature sensing elements 33 and 34 in Figure 3, respectively, and Figures 7 and 8 respectively show the air blowing temperature and resistance of the temperature sensing element at the start of cooling and heating operations with this device in Figure 3. FIG. 3 is a diagram showing changes in the rotation speed of the fan.

First, in FIGS. 3 and 4, the same reference numerals as in FIGS. 1 and 2 indicate the same members as in FIGS. 1 and 2, respectively.
30 is a fan controller, and 31 is a power relay, which is composed of an excitation coil 31C and relay contacts 31a and 31b. When the contact 31a is closed and the contact 31b is open, the ignition switch 1 is activated from the battery 14.
5, fan switch 20, registers 21, 22
(When the fan switch is H, the resistor is not passed through, and when it is M, only 22 is passed.) Fan motor 3, contact 31a,
The earth and current flow, and the fan motor 3 is H, M,
The fan rotates at one of the set fan speeds of L.

When contact 31b is closed and contact 31a is open, current flows through battery 14, ignition switch 15, fan switch 20, contact 36a, fan motor 3, contact 31b, fan controller 30, and ground, and is adjusted by fan controller 30. The fan motor 3 is driven at the same rotation speed. Reference numeral 32 denotes a changeover switch, which is a switch for changing over the temperature-sensitive resistance elements 33 and 34 that are input to the fan controller 30. 33 is a temperature-sensitive resistance element whose resistance changes by sensing the temperature of the air passing through the cooling heat exchanger 4 or its vicinity, and has the characteristics shown in FIG.
Reference numeral 4 denotes a heating heat exchanger, and 6 a temperature-sensitive resistance element whose resistance changes by sensing the temperature of the air passing through it or its vicinity, which has the characteristics shown in FIG. The details of the fan controller 30 are described with reference to FIG.
is a comparator switching IC, 41, 42, 43 are transistors, 44 is a fixed resistor, 45 is a Zener diode that creates a constant voltage, 46 is a diode, 47
is a capacitor. The inputs of the temperature sensitive resistance elements 33 and 34 are switched by the changeover switch 32, and the base potential VA of the transistor 41 is controlled by the resistance characteristics thereof. The comparator 40 compares the potential of the temperature-sensitive resistance element 33 or 34 with the potential corresponding to a preset temperature, and
When the resistance of 4 exceeds the predetermined set value, comparator 4
0 is OFF.

Transistors 41 and 42 form a differential amplifier and control the base current of power transistor 43. The power relay 35 is composed of an excitation coil 35C, contacts 35a, 35b, and an excitation coil 35C.
A voltage is applied through the fan switch 20 only when the fan switch 20 is set to L, M, or H by turning on a changeover switch 50, which will be described later. When the exciting coil 35C is excited, the contact 35a is open and the contact 35b is closed. When the exciting coil 35C is de-energized, the contact 35a is closed and the contact 35b is closed.
5b is open.

The power relay 36 has a contact 36a, and the contact 36
When a is closed, current flows from the power supply side of the fan switch 20 to the fan motor 3 through the resistors 21 and 2.
The current flows bypassing the 2-fan switch contact, and like the power relay 31, when the comparator 40 is turned on, it is energized, and when the comparator 40 is energized, the contact 36a is closed. On the other hand, the contact 31a is open and the contact 31b is closed.

The changeover switch 50 is a manual selection switch that can be used to activate or deactivate the fan control.

In such a device, when the vehicle is parked for a long time during the summer day, the changeover switch 32 inputs the temperature-sensitive resistance element 33 immediately after the air conditioner starts operating. The fan switch 20 is located at either L, M, or H.
When the changeover switch 50 is turned on, the relay coil 35C is energized, the contact 35a is opened, and the contact 35b is closed. The resistance of the temperature sensitive resistance element 33 is small due to the characteristics shown in FIG. 5, and the potential VA at point A is low. Therefore,
While the current flowing between the emitter and collector of transistor 41 increases, the current flowing between the emitter and collector of transistor 42 conversely decreases, and this current becomes the base current of power transistor 43, so as a result, the power transistor The value of the current flowing between the collector and emitter of 43 decreases. On the other hand, since the resistance value of the temperature-sensitive resistance element 33 is smaller than the predetermined set resistance value, the comparator 40
It is ON and relays 31 and 36 are energized,
Relay contacts 31b and 36a are closed, and relay contact 31a is open. Therefore, battery 14 - ignition switch 15 - fan switch 20 - contact 36
A - Fan motor 3 - Contact 31b - Collector - Emitter of power transistor 43 - Current flows between earth and the ground, but as mentioned above, since the voltage between the collector and emitter of power transistor 43 is large, the current flowing to fan motor 3 is The number of rotations of the fan motor 3 is small, and the air volume is small. Therefore, unpleasant hot air and odors can be prevented.

As the temperature of the air passing through the heat exchanger 4 or the vicinity decreases and the resistance of the temperature-sensitive resistance element 33 increases in accordance with the characteristics shown in FIG. The current value flowing through increases, and the air volume gradually increases. Cooling heat exchanger 4
Alternatively, when the nearby passing temperature further decreases and reaches a predetermined temperature tc at which comfort can be obtained, and the resistance of the temperature-sensitive resistance element 33 becomes Rc, the comparator 40
It becomes OFF. Therefore, power relays 31, 36
becomes de-energized, relay contact 31a closes, 31
b, 36a are opened, and the fan motor 3 rotates at a predetermined fan setting speed (H, M, L) without going through the fan controller 30.

FIG. 4 shows this state.

Next, if the winter warm-up operation is in progress, changeover switch 32
inputs the output of the temperature sensitive resistance element 34 to the comparator 40. The temperature of the air passing through the heating heat exchanger 6 or the vicinity thereof is low, and the resistance value of the temperature-sensitive resistance element 34 is small. Therefore, VA is low, and as explained above, the base current of power transistor 43 is small. On the other hand, since the resistance value of the temperature-sensitive resistance element 34 is lower than the predetermined set resistance value, the comparator 40 is ON, the contact 31a is an open contact,
31b and 36a are closed, the current flowing through the fan motor 3 is controlled by the fan controller 30, and the current between the collector and emitter of the power transistor 43 is small, so the rotation speed of the fan motor 3 is low, the air volume is small, and the fan motor 3 has a low rotation speed. As a result, cold air drift can be prevented and good results can be obtained in terms of feeling.

As the engine cooling water temperature gradually rises and the temperature of the heating heat exchanger 6 or nearby passing air rises, the resistance of the temperature sensitive resistance element 34 also increases in line with the characteristics shown in Figure 6, and VA increases. . Therefore, the current between the emitter and the collector of the transistor 41 decreases,
The current between the emitter and the collector of the transistor 42 increases, and the base current of the power transistor 43 increases.
The current between the collector and emitter of fan motor 3 increases, and accordingly, the current of fan motor 3 also increases, and the air volume gradually increases.

When the temperature of the air passing through the heating heat exchanger 6 or the vicinity reaches a temperature (t _H ) at which a predetermined sense of comfort can be obtained, the resistance of the temperature-sensitive resistance element 34 becomes R _H (=Rc), and the comparator 40 becomes Turn off. Therefore, the relay coils 31c and 36 are de-energized, and the contact 31a
is closed, contacts 31b and 36a are opened, and the fan motor 3 rotates at a predetermined set fan speed (H, M, L) without going through the fan controller 30, resulting in a good feeling.

When the changeover switch 50 is OFF, the relay coil 35c is de-energized and the contact 35a is closed.
Since 5b is open, the temperature-sensitive resistance elements 33, 3
4 is not input to the comparator 40, and the resistors 44h, 44
The partial pressure by m is input. 44m is set to a sufficiently large value compared to the temperature-sensitive resistance elements 33 and 34, the comparator 40 is turned off and the relay coils 31c and 36 are de-energized, so that the temperature-sensitive resistance elements 33 or 34 reach the set temperature. The result is the same as when it becomes a resistance, and the fan motor 3 rotates at the set rotation speed (H, M, L). Therefore, fan control can be canceled.

When the fan switch 20 is OFF, no voltage is applied to the fan motor 3 and fan controller 30, so the fan 2 does not rotate.

Changes in the blowout temperature, resistance of the temperature-sensitive resistance element, and fan rotation speed due to the above effects are shown in FIGS. 7 and 8, respectively.

With such a device, it is possible to prevent hot air and odors when starting the air conditioner in the summer, and also to prevent cold air drift during warm-up operation in the winter. can be used in common, resulting in a car air conditioning system that is easy to install.

In the above embodiment, a temperature-sensitive resistance element that senses the temperature of the heating heat exchanger 6 or nearby passing air is used, but instead of this, a temperature-sensitive resistance element that senses the engine coolant temperature may be used. Further, the characteristics of the temperature-sensitive resistance element are not limited to those shown in FIGS. 5 and 6, but may be reversed. In this case, it is sufficient to change the connection of the temperature-sensitive resistance element to the input of the fan controller comparator 40.

The switching of the changeover switch 32 is such that when the outside temperature exceeds the set value, the cooler temperature sensing element 33
Heater temperature sensing element 34 when the temperature drops below the set temperature
can also be input to the fan controller 30 respectively, and if the position of the air mix damper 5 is at MAX COOL and its vicinity, the cooler temperature sensing element 33 will be activated, and if the position of the air mix damper 5 is at MAX COOL, the cooler temperature sensing element 33 will be input to the fan controller 30. The heater temperature sensing elements 34 can each input input to the fan controller 30 when the air outlet mode is in the position.
When the cooler temperature sensing element 33 is in FACE9, the heater temperature sensing element 34 is It is also possible to input the information to the fan controller 30.

Fan switch 20 and fan controller 30
By installing a DEF mode switch between the Even in this state, air is blown out from the air outlet 12, and the defrost operation can be performed at the same time as the start.

In short, according to the present invention, the first temperature sensing element is attached to or near the evaporator and detects the evaporator temperature or the air temperature near the evaporator;
A second temperature-sensing element attached to or near the heater core and detecting the heater core temperature or air temperature near the heater core, and the outputs of the first and second temperature-sensing elements are selectively inputted and selected via a switching circuit, respectively. and a rotation speed continuous control electronic circuit that gradually increases the speed of the fan until each of the above-mentioned temperature sensing elements detects the set temperature, and rotates the fan at a predetermined speed after reaching the set temperature. As a result, the present invention is extremely useful industrially because it provides a vehicle air conditioner that improves the feeling at the start of cooling/heating operation.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a known air mix type car air conditioner system, Fig. 2 is a control circuit diagram of Fig. 1, Fig. 3 is a control system diagram showing an embodiment of the present invention, and Fig. 4 is a system diagram showing a known air mix type car air conditioner system. Figure 3 is an enlarged circuit diagram of the fan controller, Figures 5 and 6 are characteristic diagrams of temperature sensing elements 33 and 34 in Figure 3, respectively, and Figures 7 and 8 are cooling diagrams using this device in Figure 3, respectively. Air blowing temperature at the start of operation and heating operation,
FIG. 3 is a diagram showing changes in the resistance value of a temperature sensing element and the rotation speed of a fan. 1...Internal and external air switching damper, 2...Fan, 3...
...Fan motor, 4... Cooling heat exchanger, 5...
Air mix damper, 6... Heating heat exchanger,
7, 8...Blowout mode damper, 9...Ventilation duct, 10...Blowout duct at foot, 11...
...Rear seat footwell air duct, 12... Defroster duct, 13... Vehicle interior, 14... Battery, 15...
...Ignition switch, 16...Relay for fan motor, 19...Relay contact, 20...Fan switch, 21, 22...Resistor, 23...Air conditioner switch, 30...Fan controller, 3
1... Power relay, 31a, 31b... Relay contact, 31c... Excitation coil, 32... Changeover switch, 33... Temperature sensitive resistance element, 34... Temperature sensitive resistance element, 35... Power relay, 35a, 35b...
...Contact, 35c...Exciting coil, 36...Power relay, 36a...Contact, 40...Comparator, 4
1, 42...Transistor, 43...Power transistor, 44a, 44b, 44c, 44d, 4
4e, 44f, 44g, 44h, 44i, 44
j, 44k...Resistor, 45...Zena diode, 46a, 46b, 46c, 46d...Diode, 47a, 47b...Capacitor, 50...
Manual changeover switch.

Claims (1)

[Scope of utility model registration request] a first temperature sensing element attached to the evaporator or its vicinity to detect the evaporator temperature or the air temperature near the evaporator; a second temperature sensing element attached to the heater core or its vicinity to detect the heater core temperature or the air temperature near the heater core; The outputs of the first and second temperature sensing elements are selectively inputted through the switching circuit, and the speed of the fan is gradually increased until each of the selected temperature sensing elements detects its set temperature. 1. A vehicle air conditioner comprising: a rotation speed continuous control electronic circuit that rotates each fan at a predetermined speed after reaching a temperature.