JPS621851B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to an automatic mode vehicle air conditioner that enables accurate air conditioning control.

(b) Prior art Some vehicles are equipped with an air conditioner (hereinafter referred to as "air conditioner") that dehumidifies the interior of the vehicle and adjusts it to an optimal temperature. Luxury cars tend to be equipped with air conditioners called automatic air conditioners, which automatically adjust the temperature to the optimum temperature in response to changes in temperature and driving conditions. FIG. 1 shows a schematic configuration of this type of air conditioner together with a control circuit, in which an intake door 1 is switched and a blower fan 3 rotated by a motor 2 takes in outside air A or inside air B from an air intake port 4, and an evaporator 5 takes in outside air A or inside air B. Once dehumidified and cooled, a portion is heated by the heater core 7 depending on the opening degree of the air mix door 6, and mixed with the unheated portion again to obtain air at a desired temperature, and the air is delivered to the foot of the room from the foot outlet 8 to the vent outlet 9. Air is blown from the defroster outlet 10 upward into the room to the defroster nozzle. Reference numerals 11, 12, and 13 are a foot door, a vent door, and a differential door that control the air from the air outlets 8, 9, and 10, respectively. The evaporator 5 cools and dehumidifies the air sucked in using the heat of vaporization when the refrigerant that has been compressed into a liquid state by a compressor 15 driven by an engine 14 vaporizes. 16 is a condenser that liquefies the vaporized refrigerant, and 17 is an expansion valve. Cooling water from the engine 14 is circulated through the heater core 7 via a water tank 18 to heat the air. Intake door 1, air mix door 6,
Each outlet door 11, 12, 13 is provided with an actuator 19, 20, 21, 22,
23, these actuators are driven by respective solenoid valves 24, 25, 26,
27 and 28. Each solenoid valve is supplied with negative pressure from a vacuum tank 29 connected to the intake manifold of the engine 14, and is energized based on a command from a control section shown in FIG.

FIG. 2 shows the control circuit of the air conditioner as a block diagram.
2, cooling air temperature sensor 33, outside temperature sensor 34,
The required air outlet temperature is calculated based on the temperature detected by the room temperature sensor 35, and the opening degree of the air mix door 6 is calculated based on this required air outlet temperature. controlling the position. Also, the air outlet 8 can be selected by operating the mode selection switch 36.
When a bi-level mode in which warm air is blown from the air outlet 9 and cold air is blown out from the air outlet 9 and a defroster mode in which fog is removed from the windshield is selected, the outlet is switched to the corresponding one. Also temperature setting device 3
In addition to being able to set the desired cabin temperature, 1 can also be set to maximum warming mode or maximum cooling mode, and when the maximum cooling mode is set, the water Kotoku 18 is closed.

On the other hand, the control section 30 controls the rotational speed of the blower fan motor 2 by controlling the conduction of the transistor 37 based on the temperature difference between the set temperature and the room temperature, thereby controlling the air volume. In this case, the engine water temperature is detected by the engine water temperature sensor 38, and the timing of blowing out the hot air is controlled. Further, the output of a cooling air temperature sensor 33 provided on the outlet side of the evaporator 5 is used to control on/off of the compressor 15 via an air conditioner relay 39 in order to prevent the evaporator 5 from freezing. In addition, 3
6 is an outlet selection switch that automatically or manually controls the outlet; 40 is a water outlet 18;
41 is a fan switch that automatically or manually controls the blower fan; 42 is a manual changeover switch for the intake door.

Conventionally, as shown in FIG. 3, in rainy weather, the intake door 1 is sometimes used to introduce outside air, the air outlet 10 is set to the differential mode, and the fan is set to the maximum air volume in order to prevent the windows from fogging up. However, these air conditioning conditions were conventionally selected by operating a lever, so even if the ignition key was turned off, the air conditioning conditions remained the same, and when the ignition key was turned on after getting in the car, the previous air conditioning conditions were used. Air conditioning control is performed. In the case of this kind of air conditioner, if you do not ride for a long time during periods of unfavorable weather or when the season changes, when you return to the car, the previous air conditioning conditions will be the same even though the outside temperature and solar radiation conditions have changed. Since the operation starts with the state stored in the storage means 43, there is a risk that the air conditioning condition will be in an unexpected state that is far from the desired air conditioning condition.

(c) Object and structure of the invention The present invention has been made in view of the above points, and an object of the present invention is to perform appropriate air conditioning control according to the weather when using a car, and for that purpose, When the switch is turned off, the set temperature data erases information regarding the air outlet, air volume, and intake door air conditioning conditions, and when the ignition switch is then turned on, the intake door and air outlet are set based on the set temperature or manual switch. When the fan switch is pressed, the air conditioning is controlled including the blowout air volume and compressor control.

(d) Examples The present invention will be explained below based on the drawings.

The configuration of the air conditioner according to the present invention is as shown in FIG. 4, and its functional flowchart is different from the conventional example shown in FIG. 3, as shown in FIGS. 3 and 5. It's on. That is, the third
As shown in Figure 5 and Figure 5, assume that the air conditioning control conditions during the previous run were: the outlet mode was fixed at the vent outlet, the blower fan speed was at low speed, the intake door was at the outside air introduction position, and the set temperature was 26°C. F
-1) and ignition key 42 after driving.
When set to the off position (F-2), the air conditioning control conditions are erased by the erasing means 45, and the set temperature is stored in the storage means 43a. (F-3) After that, when you get in the car and turn on the ignition key switch 44, the intake door and air outlet are set automatically or based on the information from the manual switch, the first setting means 43b
is stored, and the fan and compressor are turned off (F-4) (F-5). That is, the air conditioning is controlled based on the stored contents from the setting means 43b. In an environment where you can drive under comfortable temperature conditions without having to operate the fan or compressor, it is energy-saving to disable the fan and compressor from operating automatically just by operating the ignition key. It is also convenient from above. If you wish to perform cooling, dehumidification, and air volume control, press the fan switch 41 (F-
6) Information regarding the strength of the air volume and whether the compressor is on or off is stored in the second setting means 43c, and the air conditioning is controlled based on the stored contents and the stored contents of the first setting means 43b (F-7).

In addition, in conventional air conditioners, as shown in Figure 3, the air conditioning conditions at the time of the previous run are maintained as they are even when the ignition switch is turned off.
After that, when you get in the car and turn on the ignition switch, the air conditioning operation will be performed again under the same air conditioning conditions.

In this way, in the present invention, when the ignition key is turned off for restart after the ignition key is turned off, only the set temperature of the air conditioning conditions during the previous run is memorized and other air conditioning conditions are erased. This makes it possible to prevent unnecessary air conditioning control from being performed unintentionally, which is useful in terms of fuel efficiency.

(E) Effects of the Invention As explained above, in the present invention, when the ignition switch is turned off, the air conditioning conditions from the previous run are erased except for the set temperature, and when the ignition switch is then turned on, the intake door The air conditioning is controlled based on the information about the air outlet and air outlet, and when the fan switch is turned on, the air conditioning operation is performed based on the information about the airflow volume and compressor, and the air conditioning operation is stopped.
There is no need to worry about changing conditions, and fuel efficiency can be expected.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a conventional air conditioner, Fig. 2 is a block diagram of a control circuit of the conventional air conditioner, Fig. 3 is a diagram showing the state of air conditioning conditions of the conventional air conditioner, and Fig. 4 is a diagram showing the state of the air conditioning conditions of the conventional air conditioner. FIG. 5 is a block diagram of one embodiment of the control circuit for the air conditioner according to the present invention, and is a flowchart showing the control operation of the air conditioner shown in FIG. 1... Intake door, 2... Blower fan motor, 3... Blower fan, 5... Evaporator, 6... Air mix door, 7... Heater core, 8, 9, 10... Air outlet, 14... Engine, 15... ... Compressor, 16 ... Capacitor, 18 ... Water tap, 19-22 ... Actuator, 24-28 ... Solenoid valve, 30 ... Control unit, 31 ... Room temperature setting device, 32
...Solar radiation sensor, 34...Outside temperature sensor, 35...
... Room temperature sensor, 36 ... Air outlet selection switch, 4
1...Fan switch.

Claims (1)

[Claims] 1 From the required air outlet temperature calculated based on at least the vehicle interior temperature, outside air temperature, and set temperature,
In a vehicle air conditioner capable of controlling the blowout air volume and intake door air conditioning conditions automatically or by a manual switch, a set temperature storage means for retaining data of the set temperature when an ignition switch is turned off; a first setting means for storing information regarding the air outlet and intake door when the ignition switch is turned on; a second setting means for storing information regarding the blowout air volume and compressor control when the fan switch is turned on; and an erasing means for erasing information regarding the air conditioning conditions stored in the first setting means and the second setting means before turning off, and upon restart based on the set temperature data from the set temperature storage means. A vehicle air conditioner characterized by performing air conditioning control.