JPH0121843Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for an automobile that adjusts the temperature of air discharged into a vehicle interior by controlling the temperatures of a heater core and an evaporator.

Generally, an air conditioner for an automobile consists of an intake unit 1 and a cooler unit 2, as shown in Fig. 1.
and a heater unit 3. The intake unit 1 has a built-in fan 5 driven by a motor 4, and further includes an inside air inlet 6 into which the circulation flow into the vehicle interior flows, an outside air intake 7 into which the outside air flows, and one of the inside air inlet 6 and the outside air intake 7. The intake unit 1 is provided with an outlet 8 through which the air sucked in from one or both is sent out by the fan 5. Also, intake unit 1
In order to control the air flowing in through the inside air inlet 6 and the air flowing in through the outside air intake 7,
An intake door 9 is installed inside the intake unit 1. The intake door 9 moves to a position A where the inside air inlet 6 is closed, a position C where the outside air intake 7 is closed, and a position B between these positions.

The cooler unit 2 into which air from the intake unit 1 flows is formed with an inlet 10 connected to the outlet 8 of the intake unit, and the refrigerant from the refrigerant conduit 11 of the cooling circuit passes through the expansion valve 11a. An evaporator (evaporator) 12 into which the air flows under reduced pressure is built in, and heat is exchanged between the air from the intake unit 1 and the refrigerant in this evaporator. The outlet 13 of the cooler unit 2 is connected to the inlet 14 of the heater unit 3, and the air cooled in the cooler unit 2 flows into the heater unit 3.

Inside the heater unit 3, there is a heater core 1 into which engine cooling water flows through a hot water tank 15a in order to heat the air that has flowed into the heater unit.
In the heater unit 3, a mix door 16 is installed upstream of the heater core 15 to adjust the amount of air flowing into the heater core 15 and the amount of air bypassing the heater core. This mix door 16 is in the open position (F position),
By actuating the closed position (D position) or any intermediate position between these, e.g. E position,
All the air that has flowed into the heater unit 3 is sent into the vehicle interior through the heater core 16,
It is possible to send some air directly into the passenger compartment without passing through it, or to send some air through the heater core 15 and other air without passing it through the heater core 15 and then mix it and send it into the passenger compartment, or to send it without mixing. I have to.

A mixing chamber 17 is formed downstream of the heater core 15, and the mixing chamber 17 includes a differential duct 18 for guiding air from the heater unit and blowing it out along the inner surface of the windshield, and a differential duct 18 for blowing air out from the heater unit along the inner surface of the windshield. A floor duct 19 for blowing air toward the driver's seat and a ventaduct 20 for sending air into the vehicle interior from a center ventilator (not shown) assembled to the instrument panel in front of the driver's seat are open. Furthermore, as shown in FIG. 2, there are a differential door 21 for controlling air distribution to the differential duct 18, a vent door 22 for controlling air distribution to the vent duct 20, and a floor door for controlling air distribution to the floor duct 19. 23 is installed within the heater unit 3.

The air conditioner is set to each mode by opening and closing these various doors. That is, in the cooler mode, the vent door 22 is fully opened, and the differential door 21 and floor door 23 are fully closed, and in the bilevel mode, the vent door 22 and floor door 23 are partially opened, and the differential door 21 is fully closed. Furthermore, in the heater mode, the vent door 2
2 is fully closed, the floor door 23 is fully opened, and the differential door 21 is half open. Further, in the differential mode, the vent door 22 and the floor door 23 are fully opened, and the differential door 21 is fully closed.

In such a conventional automobile air conditioner, the vent duct 20 or the floor duct 19
The temperature of the air discharged into the vehicle interior is controlled by controlling the opening degree of the mixer door 16. In other words, out of the air cooled through the evaporator 12, the air remains as cold air without passing through the heater core 15, and the air that has passed through the heater core 15 and becomes warm air is mixed in the mixing chamber 17, and then the vent duct 20 etc. The fuel is discharged into the vehicle interior.

However, because the volume of the mixing chamber 17 is limited, there are cases where warm air and cold air are not mixed sufficiently and are discharged into the passenger compartment, which could cause discomfort to passengers. There was a problem.

The purpose of the present invention is to control the temperatures of the evaporator and heater core so that the air discharged into the vehicle interior has a uniform temperature.

The configuration of the present invention to achieve the above object includes a cooler unit that has a built-in evaporator and cools the air that passes through the evaporator, and a heater unit that has a built-in heater core that heats the air that has passed through the cooler unit. and a clutch for turning on and off a compressor for supplying refrigerant to the evaporator, and a hot water pot for controlling the amount of hot water supplied to the heater core, the air conditioner being provided in front of the heater core. A mixture door that operates in at least two positions, a fully open position and a fully closed position, and a temperature setting means that has an operating range of a cold air region, an intermediate region, and a warm air region and adjusts the temperature of air blown into the vehicle interior. a sensor for detecting the temperature of the air passing through the evaporator; a set value detecting means for detecting the set position of the temperature setting means; a first calculation means that compares whether the clutch is set to one of the cold air regions and the intermediate region, and issues an on/off signal for the clutch in the cold air region and the intermediate region; Detecting whether or not the temperature is set to 1, and outputting a signal for controlling the opening degree of the hot water pot in accordance with the signal from the set value detection means in the intermediate region and the hot air region. This is an air conditioner for an automobile having two calculation means.

Next, an embodiment of the present invention shown in FIGS. 3 to 5 will be described. In FIG. 3, the same reference numerals are given to the same parts as those in the conventional automobile air conditioner shown in FIG.

As shown in FIG. 3, a thermistor 24 is installed immediately after the evaporator 12, and this thermistor 24 serves as a sensor for detecting the temperature of the air immediately after passing through the evaporator 12. A signal from the first arithmetic circuit 26a is sent to a clutch 25 that controls the on/off state of connection between a compressor for compressing refrigerant circulating in a cooling cycle (not shown) and an engine for driving the compressor. The clutch 25 is controlled by a signal from this.

The hot water pot 15a is configured to control the flow rate of engine cooling water to the heater core 15, and by operating a template lever (temperature setting means) 27 in the vehicle interior, the hot water pot 15a controls the flow rate of hot water to the heater core 15. control. Further, as shown in FIG. 4B, the mixer door 16 operates in two positions: a fully closed position H that stops the flow of air to the heater core 15, and a fully open position G that guides all the air to the heater core 15. It's summery. In other words, the mix door 16 of the present invention is not for mixing cold air and hot air like the conventional mix door 16, but as shown in FIG. It is controlled to switch between H and fully open position G.

The relationship between the position of the template lever 27, the air temperature immediately after the evaporator, and the flow rate of hot water flowing into the heater core 15 is shown in FIG. It has a region K and a hot air region L.
In the cold air region J of the template lever 27, the hot water tank 15a is closed to stop the supply of hot water to the heater core 15, and the temperature of the air passing through the evaporator 12, that is, the temperature of the air immediately after the evaporator 12, It is controlled to increase as it approaches the intermediate region K. As mentioned above, this temperature control is performed by on/off control of the clutch 25, and in this cold air region J, the mix door 16 is in the H position as shown in FIG. 4B, and the air that has passed through the evaporator 12 is Everything is blown out into the cabin. Also, template lever 2
In the intermediate region K of No. 7, as shown in FIG. The flow rate of hot water is controlled to increase. This intermediate area K
The mix door 16 is now in the fully open position G as shown in FIG. 4B. In the hot air region L of the template lever 27, the intermediate region K
Similarly, the mixer door 16 remains in the G position as shown in FIG. I'm trying to control it. The reason why the temperature of the air passing through the evaporator 12 in this warm air region L is set to the same temperature as in the full cool FC is that the air that has passed through the evaporator 12 and reached a predetermined reference temperature is heated and blown out. This is to facilitate control of the temperature of the air. 4A, the temperature of the evaporator 12 is controlled as shown in FIG. 4C, and the amount of hot water flowing to the heater core 15 is controlled according to the position of the template lever 27, as shown in FIG. 4B. FIG. 4 is a diagram showing the temperature of the air outlet that will be blown into the vehicle interior by controlling the position of the mixer door 16 to be switched to any one of the positions as shown in FIG.

As mentioned above, the means for controlling the hot water cots 15 and the evaporator 12 are shown in FIGS. 5 to 7.
This will be explained using figures. The thermistor in Figure 5,
That is, the sensor 24 and the resistor R1 are connected in series, and are connected to the power supply 28. Also,
A variable resistor whose resistance value changes when the template lever 27 is operated, that is, a set value detection means 29 and a resistor R2 are connected in series and connected to a power source 28. Therefore, when the temperature of the air immediately after the evaporator 12 increases, a high voltage signal VE is sent to the first arithmetic circuit 26a. Further, a voltage signal VL corresponding to the position of the template lever 27 is sent to the first arithmetic circuit 26a and the second arithmetic circuit 26b.

The details of the first arithmetic circuit 26a are shown in FIG. 6, and the first arithmetic circuit 26a includes an A/D converter 40 to which a voltage signal VE set by the thermistor 24 is sent, and a template lever. An A/D conversion section 41 to which a voltage signal VL corresponding to the position 27 is sent is provided, and the signals converted by these sections are sent to an arithmetic processing section 42. This calculation processing unit 4
2, depending on the position of the template lever 27, the temperature of the air immediately after the evaporator 12 as shown in FIG. The clutch is controlled to be turned on and off in such a manner. Whether or not the set temperature has been reached is fed back by a signal from the voltage signal VE.
Further, when the template lever 27 is set to the warm air region L, the operation of the clutch is controlled so as to be in a full cool state as described above. This operation of the clutch is carried out by the arithmetic processing section 4.
2 to the transistor 44 via the clutch driver 43.

The details of the second arithmetic circuit 26b shown in FIG. 5 are as shown in FIG. 7, and the voltage signal VL is sent to the arithmetic processing section 51 via the A/D conversion section 50. From this arithmetic processing unit 51, the voltage signal
When the template lever 27 is set to the intermediate region K or hot air region L according to VL, a control signal is sent to the heater driver 52 to control the opening degree of the hot water pot 15a. By rotating the pulse motor 31 in this way,
The opening degree of the hot water pot 15a is controlled according to the position of the template lever 27.

In addition, when providing a bi-level mode, the mixture door 16 is operated in three positions: the fully open G position and the fully closed H position, as well as the intermediate I position, and cold air is discharged from the vent duct 20. , warm air may be discharged from the floor duct 19. However, the total air temperature reaching the vehicle interior is the fourth
The trend is as shown in the figure.

In addition, the hot water cox can be used as an on-off valve instead of a flow rate control valve, and the amount of hot water flowing to the heater core can be controlled by controlling the opening/closing time.

As described above, according to the present invention, the set value detection means compares whether the temperature detection means is set to either the cold air region or the intermediate region, and determines whether the temperature detection means is set to either the cold wind region or the intermediate region. Detects whether or not the first calculation means for generating a clutch on/off signal and the temperature setting means are set to an intermediate region or warm air region, and detects the set value in the intermediate region or warm air region. and a second calculation means for issuing a signal for controlling the opening degree of the hot water pot in response to a signal from the means, so that the hot water is discharged into the passenger compartment after reaching the ventilation chamber in the heater unit. The air is already at the specified temperature when it reaches the air distribution room, without mixing cold air and hot air as in the case of conventional methods. It becomes possible to supply air into the vehicle interior.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional air conditioner for an automobile, FIG. 2 is a sectional view taken along the - line in FIG. 1,
Fig. 3 is a sectional view showing an embodiment of the present invention, Fig. 4A is a characteristic graph showing the relationship between the position of the template lever and the air temperature at the outlet, and Fig. 4B is a graph showing the relationship between the position of the template lever and the mix door temperature. Figure 4C is a graph showing the relationship between the position of the template lever and the hot water flow rate and the air temperature immediately after the evaporator; Figure 5 is a circuit diagram showing the control means of the present invention; 5 is a circuit diagram showing details of the first arithmetic circuit shown in FIG. 5, and FIG. 7 is a circuit diagram showing details of the second arithmetic circuit shown in FIG. 5. 1... Intake unit, 2... Cooler unit, 3... Heater unit, 12... Evaporator, 15... Heater core, 15a... Hot water pot, 16... Mix door, 24... Thermistor (sensor), 25... Clutch, 26a...first arithmetic circuit (first arithmetic means), 26b...second arithmetic circuit (second arithmetic means), 27...temperature lever (temperature setting means), 29...resistor (set value detection) means).

Claims (1)

[Scope of utility model registration request] It has a cooler unit that has a built-in evaporator and cools the air that passes through the evaporator, and a heater unit that has a built-in heater core that heats the air that has passed through the cooler unit, and turns on and off the compressor for supplying refrigerant to the evaporator. In the air conditioner for an automobile, the clutch is provided with a clutch that controls the amount of hot water supplied to the heater core, and a hot water socket that controls the amount of hot water supplied to the heater core. a temperature setting means for adjusting the temperature of the air blown into the vehicle interior, and a sensor for detecting the temperature of the air that has passed through the evaporator; , a set value detection means for detecting a set value of the temperature setting means, and a comparison of whether or not the temperature setting means is set to either the cold air region or the intermediate region by the set value detection means; In the case of the cold air region and the intermediate region, the first calculating means generates an on/off signal for the clutch, and the temperature setting means detects whether or not the temperature setting means is set to the intermediate region and the warm air region, and second calculation means for issuing a signal for controlling the opening degree of the hot water pot in accordance with the signal from the set value detection means in the hot air region and the hot air region. Device.