JPH0899524A - Automobile air conditioner control method - Google Patents

Abstract

PURPOSE: To reduce a burden to a compressor so as to improve rapid cooling performance by leading in outside air for the fixed time to cool rapidly and then switching to inside air circulation when the cabin internal temperature is higher than the outside air temperature by the fixed value or more. CONSTITUTION: A boundary part between an outside air lead-in port 2 and an inside air lead-in port 3 is provided with a damper valve 7 driven by an actuator so as to switch the led-in outside and inside air or to switch to the simultaneous intake of both outside and inside air. The signals of an outside air temperature sensor and an inside air temperature sensor for detecting the outside air temperature and inside air temperature are inputted to an air conditioner controller. When the cabin internal temperature is higher than the outside air temperature, the outside air is led in to cool, and when the cabin internal temperature is the specified value or lower, switching control to inside air circulation is performed. When the cabin internal temperature is higher than the outside air temperature by the fixed value or more, the outside air is led in for the fixed time to cool rapidly, and then switching to inside air circulation is performed. The inside air temperature is thereby lowered rapidly with no influence thereon even if detection delay is generated to the inside air temperature sensor, so that the burden of a compressor is reduced to enable the improvement of fuel consumption and accelerating performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an air conditioner for automobiles.

[0002]

2. Description of the Related Art In an air conditioner mounted on an automobile, an outside air intake mode for introducing air for heating, cooling, or dehumidifying from the outside of the passenger compartment, an inside air circulation mode for circulating air in the passenger compartment, and a mixture thereof are mixed. There is a mixed mode. These modes are appropriately selected according to the values of the outside air temperature and the temperature of the air inside the vehicle. Since this selection is performed based on the temperature, the vehicle is provided with an outside air temperature sensor that detects the outside air temperature and an inside air temperature sensor that detects the temperature inside the vehicle.

According to the temperatures detected by the outside air temperature sensor and the inside air temperature sensor, when the temperature inside the passenger compartment (hereinafter referred to as the inside air temperature) is higher than the outside air temperature, the outside air is introduced into the passenger compartment to cool it and the inside air temperature is below a predetermined value. There is a known air conditioner for an automobile that is switched to the internal air circulation when it becomes. As the prior art, the actual exploitation is 58-295.
15 and Japanese Patent Publication No. 61-40567 and Japanese Patent Laid-Open No. 61-50822. All of the publications described in these publications perform switching between the inside air and the outside air in the same manner as described above, so that the load on the compressor can be reduced during cooling and efficient rapid cooling can be performed.

An example of an automobile air conditioner will be described with reference to the drawings. FIG. 5 shows an air conditioner for an automobile,
Reference numeral 1 denotes a duct, which is provided with an outside air inlet 2 and an inside air inlet 3 as inlets, a lower heater outlet 4, a front ventilator outlet 5 and an upper defroster outlet 6 as outlets. The outside air inlet 2 takes in air outside the vehicle compartment for ventilation, and the inside air inlet 3 takes in air inside the vehicle compartment for circulation.

A damper valve 7 is provided at the boundary between the outside air introduction port 2 and the inside air introduction port 3 and is driven by an actuator 8 so as to switch between them or simultaneously take in air from both. Reference numeral 9 is a blower fan, 10 is a drive motor for the blower fan, 11 is an evaporator for cooling, and 12 is a heater core. A damper valve 13 is provided at the front of the heater core 12, and a mechanism (not shown) switches air between a flow passing through the heater core 12 and a bypass or a mixed flow of these.

The ventilator outlet 5 is also provided with a damper valve 14. Although not shown, an outside air temperature sensor for detecting the outside air temperature and an inside air temperature sensor for detecting the inside air temperature are provided, and when these are started in the auto mode or switched to the auto mode after the start, these temperatures are detected. The adjustment is automatically performed according to the detection value of the sensor.

In this air conditioner, the blower fan 9
The air taken into the duct 1 from the outside air introduction port 2 and the inside air introduction port 3 by the operation of is operated by the evaporator 11 when the cooling switch is turned on or the set temperature is low.
Is cooled when passing through, and is heated as it is or depending on the direction of the damper valve 13, and is discharged into the vehicle compartment from any or a plurality of outlets. In the case of general auto mode, the difference between the detected values of the inside air temperature and the outside air temperature is shown in FIG.
When the value is equal to or more than the predetermined value indicated by A, the outside air is introduced, and when the value is less than the predetermined value B, the inside air is circulated.

[0008]

By the way, when the inside air temperature changes with the passage of time, the detected value of the temperature sensor for detecting this is as shown in FIG. Usually, there is a difference between the two, as shown in. This is because the detection of the temperature sensor is delayed. As shown in FIG. 4, the predetermined value C is not used as the internal air circulation, and the predetermined value D is used as the internal air circulation for the first time.
When the detected value of the temperature sensor becomes equal to or lower than a predetermined value, there is a problem that the actual inside air temperature becomes considerably low. This point can be said even in the prior arts described in the above publications.

The present invention has been made in view of this point, and an object of the present invention is to provide a method for controlling an air conditioner for a vehicle, which reduces the load on the compressor and improves the rapid cooling performance.

[0010]

According to the present invention, the temperature inside a vehicle and the temperature of the outside air are detected, and when the temperature inside the vehicle is higher than the temperature of the outside air, the outside air is introduced into the vehicle to cool the vehicle and the temperature inside the vehicle is maintained at a predetermined level. In an automobile air conditioner that switches to the inside air circulation when the temperature falls below a specified value, when the temperature inside the vehicle is higher than the outside temperature by a certain value or more, the outside air is introduced for a certain period of time to perform rapid cooling, and then the inside air A method for controlling an air conditioner for an automobile, characterized by switching to circulation.

[0011]

With such a structure, when the temperature difference between the inside and outside of the vehicle is equal to or greater than a certain value, the control logic incorporated in the controller performs rapid cooling with the outside air introduced into the vehicle for a certain period of time to rapidly increase the inside air temperature. Lower. Next, the load on the compressor is reduced by switching to the internal air circulation for cooling.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method of the present invention will be described below with reference to FIGS. When the temperature of the inside air becomes extremely high due to, for example, parking the vehicle in the hot sun for a long time, the set temperature is sufficiently lowered and the rotation speed of the blower fan 9 is increased to perform so-called rapid cooling. At this time, since there is a large temperature difference between the detected value of the indoor temperature sensor and the actual inside air temperature, the switching between outside air and inside air is not controlled only by the difference between the inside air temperature and the outside air temperature, and the auto switch is turned on. When the difference between the detected values of the inside air temperature sensor and the outside air temperature sensor is equal to or greater than a certain value, for example, when the inside air temperature is equal to or greater than the outside air temperature plus 20 ° C. After a certain period of time, for example, 2 minutes, the outside air is introduced to perform rapid cooling, and after a lapse of time, the inside air circulation is switched to perform cooling. By controlling in this way,
It is possible to perform cooling with maximum efficiency regardless of the detection delay of the inside air temperature sensor. The above "20 ° C" and "2 minutes" are merely examples, and the present invention is not limited to these values.

FIG. 3 is a flow chart showing an example when the above control is actually performed. The control logic is built into the microcomputer of the air conditioner controller. The process proceeds to the start of step S1, the initial setting of step S2, the switch (air conditioner switch) signal input of step S3, the sensor signal input of step S4, and the outside air temperature determination of step S5. This outside air temperature judgment is that the outside air temperature is "summer",
It is divided into five modes of "spring 1", "spring 2", "winter" and "extremely cold". That is, the temperature is 24 ° C. or higher in “summer”, 12 ° C. or higher in “spring 1”, 2 ° C. or higher in “spring 2”, 2 ° C. or lower in “winter”, and 0 ° C. or lower in “extremely cold”. As a result of the judgment, the range from "Spring 1" to "Fresh cold" (Step S
In 6), it is input to the output calculation of step S14, and after calculation, it is output in step S15.

If "summer" is determined, it is determined in step S7 which one of the three outlets (see FIG. 5), and the heater outlet along with the defroster outlet 6 or the defroster outlet 6. 4 directly, when using the ventilator outlet 5 or the heater outlet 4 alone or in a combined mode of the ventilator outlet 5 and the heater outlet 4 (BI-LEVEL)
In case of, the deviation determination of the inside air temperature is performed in the next step S8, and when the inside air temperature is lower than the value obtained by adding 20 ° C. to the outside air temperature, it is input to the output calculation of step S14, and after the calculation, it is output in step S15.

In step S8, when the inside air temperature deviation is judged to be equal to or higher than the value obtained by adding 20 ° C. to the outside air temperature, step S9 is reached and the start judgment is made. If it is determined that it has been activated, 2 is performed in step S10.
When the minute timer has passed through the on / off mode and has not been activated, when the timer is determined to be on in step S11, the process proceeds to the outside air temperature setting mode in step S12. When it is determined in the timer determination in step S11 that the timer is off, the mode of the inside air temperature determination in step S13 is passed, the output calculation in step S14 is performed, and the output is output in step S15. This output signal returns to the switch signal input of step S3 and circulates thereafter.

[0016]

The present invention is a method for controlling an automobile air conditioner configured as described above. When the inside air temperature is higher than the outside air temperature by a certain value or more, the outside air is taken in for a certain period of time to perform rapid cooling. Therefore, even if there is a detection delay in the inside air temperature sensor, it will not be affected,
The inside air temperature can be lowered rapidly. In addition, in this connection, the load on the compressor is reduced, so that the fuel consumption and the acceleration performance can be improved.

[Brief description of drawings]

FIG. 1 is a graph illustrating a temperature control method according to the method of the present invention.

FIG. 2 is a graph illustrating a temperature control result by the method of the present invention.

FIG. 3 is a flowchart showing the flow of the method of the present invention.

FIG. 4 is a graph illustrating a temperature control result by a conventional method.

FIG. 5 is a system diagram showing the structure of an automobile air conditioner.

FIG. 6 is a graph showing a switching point between the outside air introduction and the inside air circulation that is generally performed.

FIG. 7 is a graph showing a temperature detection delay of a temperature sensor.

[Explanation of symbols]

 1 Duct 2 Outside Air Inlet 3 Inside Air Inlet 4 Heater Outlet 5 Ventilator Outlet 6 Defroster Outlet 7 Damper Valve 9 Blower Fan 10 Motor 11 Evaporator 12 Heater Core 13 Damper Valve 14 Damper Valve

Claims (1)

[Claims] 1. A vehicle interior temperature and an outdoor air temperature are detected, and when the vehicle interior temperature is higher than the outdoor air temperature, the outdoor air is introduced into the vehicle interior to cool the vehicle, and when the vehicle interior temperature falls below a predetermined value, the indoor air is cooled. In an air conditioner for a vehicle that is switched to circulation, when the temperature inside the vehicle is higher than a certain value by a certain value or more, the outside air is introduced for a certain period of time to perform rapid cooling, and then the mode is switched to the inside air circulation. Control method for automobile air conditioner.