JPS5876319A - Car air conditioner - Google Patents

Abstract

PURPOSE:To remove the wasteful consumption of engine output by controlling a switching means to keep the suction amount of outdoor air almost at a constant level at least in the state of cooling except at the time of full cool. CONSTITUTION:A control unit 2 calculates a theta value on the basis of a deviation between a set value and a room temperature, and decides a value under a point (a) to be full cool, between (a) and (b) to be air-mix, over a point (b) to be full heat, under O to be cooling, and over O to be heating. In accordance with this theta value, a voltage to be added to a blower motor 15a is operated as a line A, the opening of an air-mix door 20a as a line B, and an intake damper 14 as a line C. Even if the whole air is sucked from outdoor at the time of full heat, the load of an air conditioner to engine output is prevented from increasing. Upon this conception, the suction amount of open air is kept almost at a constant level at the time of cooling state except full cool as a line C' or C'' for ensuring a necessary and sufficient amount of ventilation and removing the wasteful consumption of the engine output.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for an automobile, and more particularly to an air conditioner for an automobile that has an automatic operation mode and is designed to save energy.

Conventional air conditioners for automobiles have a structure that takes in and circulates air inside the vehicle, simultaneously sucks air inside and outside the vehicle, and sucks air outside the vehicle in each mode of full cool, air conditioner, and heater. This will be explained with reference to FIG.

, cabin air intake port 12. The vehicle is equipped with an outside air intake port 13 and an intake door 14 for switching between the air intake ports 13 and 14, and the intake door 14 is operated by a negative pressure actuator 26'. This negative pressure actuator 26' is connected to the intake door 14.
A multi-stage actuator was used that has three positions: (1) for full cool operation, (2) for air conditioner (Air Mix), and (3) for upper heating. In addition, the intake air type is controlled by changing the rotation speed of the blower 15, and when operating the air conditioner manually, the air volume can be adjusted from the maximum air volume to the minimum air volume from 3 to 3.
4 stages, automatic operation from maximum to minimum air volume approximately 4:l
It is designed to change continuously with the air volume. Since automobiles require a considerable amount of ventilation in order to air condition the narrow cabin space, the amount of outside air taken in when the rotation speed of the blower 15 is at its minimum at the position π of the intake door 14 is the ventilation amount. The counterfeit is configured to meet the requirements. For this reason, even when the number of revolutions of the blower 15 was set to the minimum in the con mode during construction, sometimes more outside air was drawn in than necessary. Particularly when the outside air temperature is high and a large amount of outside air is being taken in, the air conditioner is activated to cool this high temperature outside air, which has the disadvantage of consuming unnecessary engine power.

SUMMARY OF THE INVENTION An object of the present invention is to provide an energy-saving type automobile air conditioner that eliminates the above-mentioned drawbacks.

The present invention maintains the intake amount of outside air at a substantially constant amount even when the intake air amount by the blower changes at least during cooling operation of an automobile air conditioner, and reduces the load on the air conditioner compressor even when the blower airflow is large. This is designed to reduce engine energy consumption by minimizing the amount of energy required.

An embodiment of the automobile air conditioner according to the present invention is shown in FIG.
This will be explained in more detail with reference to FIG.

FIG. 2 shows a configuration of an embodiment of an air conditioner for an automobile according to the present invention. An air conditioning unit 1, an operation unit to be described later, a control unit 2 that sends control signals to the air conditioning unit 1 etc. based on signals from sensors, etc., a set temperature in the vehicle interior,
An operation unit 3 that selects automatic operation, manual operation (blower air volume, air outlet selection, etc.), sensors 4, 5 that input vehicle interior temperature, vehicle exterior temperature, etc. to the control unit 2.
It is composed of...etc. The case 11 of the air conditioning unit 1 has nine intake ports, including a vehicle interior intake port 12 for sucking air inside the vehicle, and a vehicle exterior intake port 13 for sucking air outside the vehicle. An intake damper 14 is provided to control the intake damper. A blower 15 is provided and is driven by a motor 15a for sucking air through these suction ports, sending it to a heat exchanger to be described later, and performing air conditioning.

An evaporator 16 is provided downstream of the blower 15 to cool the air passing through it. The evaporator 16 constitutes a refrigeration cycle with a compressor 17, a condenser (not shown), and the like.

The compressor f17 is driven by a vehicle engine via a magnetic clutch 17a. This mobaporator 1
A heater core 18 through which engine/engine cooling water (warm water) circulates is provided downstream of the heater core 1d, and a bypass 19 is formed in parallel with the heater core 1d. An air mix damper 20a that controls the proportion of air that has passed through the evaporator 16 that passes through the heater core 18 and the bypass 19;
Bypass Dan/, <-2, Ob is provided. Furthermore, a floor outlet 21 blows out temperature-controlled air that passes through the evaporator 16 and the heat exchanger of the heater core 18 from the lower part of the vehicle interior. It is equipped with a ventilation outlet 22 that blows out air from the upper instrument panel, etc., a defrost outlet 23 that blows out toward the front windshield, a damper 24 that opens and closes the floor outlet 21, and an air outlet that blows out to the defrost outlet 22. A damper 25 is provided to control the.

The intake damper 14 is rotated by a negative pressure servo motor 26, and the stroke of the negative pressure servo motor 26 is controlled by applying negative pressure supplied from a negative pressure source (not shown) to an electric signal from the control unit 2. Negative pressure transducer 27
It depends on the amount of negative pressure required. The blower air volume is controlled by the voltage applied to the motor 15a by the control unit 2, and in the refrigeration cycle, the magnetic clutch 172t7 is excited by an electric signal from the control unit 2.

The compressor 17 is driven by de-energizing.

Non-driven and controlled. The inflow of hot water into the heater core 18 is controlled by opening and closing a solenoid valve 29 and the negative pressure supplied to the water cock 28 . The air mix damper 20a, which controls the vehicle interior temperature to a set temperature, is rotated by a negative pressure sateobo 30, and its control is based on the vehicle interior temperature input from the vehicle room temperature sensor 4 and the set temperature input from the operation unit 3. It depends on the magnitude of the negative pressure output from the negative pressure transducer 31 using an electrical signal from the control unit. This control signal may be corrected based on the outside temperature, 9 the amount of solar radiation, etc. The bypass door 20b is configured to rotate in conjunction with the air mix door 20a. The floor outlet 21 receives negative pressure supplied to a negative pressure actuator 34 by opening and closing a solenoid valve 35, and the defroster outlet 23 is opened and closed by a negative pressure actuator 36.
The negative pressure supplied to the dampers is controlled by opening and closing a solenoid valve 37 to control each damper.

Next, the operation of the automobile air conditioner having the above configuration will be explained. First, to explain the automatic operation state, each device constituting this air conditioner operates as shown in Fig. 3 based on the deviation between the set temperature and the vehicle interior temperature, or a value θ calculated from this deviation. . On the line of θ above, the left side from a to b is a fully cooled state, the part from ab to the so-called airic state where the mixture is reheated and mixed after cooling, and the part to the right of b is a fully heated layered state. @A is the voltage applied to the motor 15a; l) The maximum air volume is achieved at full cool and full heat, and changes depending on the value of θ from the maximum air volume to the minimum landscape in the air mix state. The refrigeration cycle or compressor 17 is operated in full cool and air mix conditions. However, driving or non-driving of the compressor 17 may be controlled depending on the outside temperature or the like even in the above state. The quarter cock 28 that controls the circulation of hot water to the heater core 1B is opened when the air is mixed and the heater is fully heated. Line B is the opening degree of the air mix door 20a (ratio of the amount of air passing through the heater core 18), which is fully closed at full cool and fully open at full heat.In a fair mix state, the opening degree changes linearly with the above θ to set the cabin temperature. It operates to adjust the temperature. The damper 24 for the floor outlet 21 is opened in the heating state. The defroster outlet control tambar 251ti operates to open the vent television outlet 22 in a cooling state and to open the defroster outlet in a heating state. Next, the intake damper 14 operates the negative pressure servo motor 13 by controlling the negative pressure transducer 27 in relation to the value of θ according to the signal from the control unit 2, and the line C in FIG. It works like that. In the full cool state, all the intake air is added to the vehicle interior air, and in the air mix state, when the blower air volume is at its minimum, the ratio of the intake amount of air outside the vehicle interior is approximately 221, and this The amount of outside air intake (ventilation t) is normally determined to be a necessary and sufficient amount. Next, in response to the increase in blower air volume in the air mix state, the opening degree of the intake damper 14 on the outside air suction side is decreased to control the outside air intake amount to always be approximately equal to the outside air intake amount. In addition, in a fully heated state, all intake air is operated to introduce outside air. 2/di/ flowing through the heater, -7,718
The heat of the cooling water is dissipated to the outside, so even if all the intake air is outside air during full heat, the burden on the air conditioner will not increase. The object of the present invention is to keep the amount of outside air introduced at approximately constant level at least when the air conditioner is in the cooling state (excluding full cool mode) as indicated by lines c' and c'' shown in Figure 3 above. In this embodiment, a negative pressure servo motor 26 and a negative pressure transducer 2 are used to operate the intake damper 14.
7 is used, however, it is also possible to use a method of controlling the stain solenoid valve by using a negative pressure actuator, a potentiometer, and a solenoid valve and feeding back a position signal from the potentiometer to the control unit. Although automatic operation has been explained above, the motor 15a also applies during manual operation.
The open air intake degree of the intake damper 14 can be controlled by a value calculated from the rotational speed (applied voltage) and the value of θ.

According to the present invention as described above, it is possible to obtain an air conditioner for an automobile that eliminates wasteful consumption of the engine output due to the drive of the air conditioner engine presser while ensuring a necessary and sufficient amount of ventilation. .

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an air intake section of a conventional air conditioner, FIG. 2 is an overall configuration diagram of an air conditioner according to the present invention, and FIG. 3 is an explanatory diagram of the operation of the air conditioner. l... Air conditioning unit, 12... Vehicle interior intake port, 13
... Vehicle exterior intake port, 14... Intake damper,
26A 31st

Claims (1)

[Claims] 1. It is equipped with an inlet for inhaling the air inside the vehicle and an inlet for inhaling the air outside the vehicle, and is provided with a means for switching between the inlets; 1. An air conditioner for an automobile, characterized in that the switching means is controlled so that the amount of air taken in outside the vehicle is substantially constant under certain conditions.