JPS60248423A - Air conditioner for car - Google Patents

Abstract

PURPOSE:To shorten the necessary starting-up time without forming cloudiness on a window glass surface on warming, by installing the sensors for room temperature, outside air temperature, and humidity into the car interior and controlling an inside/outside air damper, estimating the dew condensation on the glass surface. CONSTITUTION:In the warming starting-up subroutine by a computer 14, the set temperature Tset is read in the outside-air introducing mode, and the room temperature Ta, relative humidity phi, and outside air temperature Tout are measured, and when Ta>Tset, it is judged that the room temperature Ta reaches the set temperature Tset, and the starting-up subroutine is completed. While, Tset> Ta, the dew-point temperature Tdp is calculated from the room temperature Ta and the relative humifity phi, and the window glass corresponding temperature Tw is calculated from the outside air temperature Tout, and Tdp is compared with Tw+C (C is a positive constant), and when Tdp>Tw+C, inner air circulation is maintained, and when Tdp<Tw+C, outside air circulation is maintained, and the room temperature Ta is measured again. Thus, the ratio of the inside and outside air can be varied arbitrarily without generating dew condensation.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an air conditioner for an automobile.

As shown in the structure of the conventional example and its problems, there is a heater 2 that heats the inside of the vehicle compartment 1, a blower 3 that blows air to the heater 2, and an inside/outside air damper 4 that changes the introduced air to internal air circulation/outside air introduction. , a damper actuator 5 that operates the inside and outside air damper, a room temperature sensor 6 that detects the temperature inside the vehicle interior, an outside temperature sensor 7 that detects the temperature outside the vehicle interior, and a temperature setting section 8 that sets the desired temperature.
and a control section 9 that controls the damper actuator 5 by determining data from the room temperature sensor 6, the outside temperature sensor 7, and the temperature setting section 8 when heating starts. In this configuration, in order to accelerate the start-up of heating, the decision to switch between inside and outside air is made only based on temperature conditions, and although it is effective in speeding up the start-up of heating, it is not possible to control the humidity. There was a problem that the inner surface of the window glass became foggy during circulation.

As shown in FIG. 2, a heater 2 heats the inside of the vehicle interior 1, a blower 3 blows air to the heater 2, an internal/external damper actuator 5 that changes the ratio of inside air to outside air in the introduced air, and a humidity sensor 10 that detects the relative humidity of
a dew condensation sensor 11 that detects fogging of window glass; and a microcomputer 12 that controls the damper actuator 5 using data from the humidity sensor 10 and the dew condensation sensor 11.
However, in this configuration, the humidity inside the vehicle is controlled by the humidity sensor 10, and the condensation can be prevented in advance by simply determining that the window surface has become foggy by using the condensation sensor 11. Unless preventive controls are implemented, fogging is likely to occur, especially when the temperature of the window surface is low when the heating is started, and it takes a considerable amount of time to clear the fogging that has already formed, during which time the driver The problem was that drivers were forced to drive in a dangerous manner.

OBJECTS OF THE INVENTION The present invention eliminates such a conventional interlayer, and aims to shorten the rise time without fogging the window surface during heating.

Structure of the Invention To achieve this object, the present invention provides a room temperature sensor, an outside temperature sensor, a humidity sensor, and a microcomputer that controls an inside and outside air damper based on data of these sensors in a vehicle interior.

With this configuration, the amount of water vapor in the vehicle interior can be ascertained, and the state of dew condensation on the glass surface can be predicted.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. In FIG. 3, a heater 2 that heats the inside of the vehicle compartment 1
, a blower 3 that blows air to the heater 2, an inside and outside air damper 4 that changes introduced air into inside air and outside air, a damper actuator 5 that operates the inside and outside air damper 4, and a room temperature sensor that detects the temperature inside the vehicle interior. 6, an outside temperature sensor 7 that detects the temperature of the outside air, a humidity sensor 10 that detects the relative humidity in the vehicle interior, a temperature setting unit 8 that sets the desired temperature, and the room temperature sensor 6 and the external note when heating starts. A microcomputer 14 is provided which uses data from the temperature sensor 7 and the humidity sensor 10 to judge the condensation conditions on the window glass and controls the damper actuator 5. The heating start-up control by the microcomputer 14 is performed as shown in FIG.
reading the set 17, measuring the room temperature Ta 18, measuring the relative humidity ψ 19, and measuring the outside temperature Tout 20,
Compare Tset and Ta in step 21, and if Tset) does not satisfy Ta, it is determined that the room temperature Ta has reached the set temperature Tset, and the start-up subroutine is terminated.2 2oTse
When t > Ta is satisfied, the dew point temperature Tdp is calculated 23 from the room temperature Ta and the relative humidity ψ, and the window glass equivalent temperature Tw is calculated 24 from the outside temperature Tout using the following formula.
w = mTout + n (m, n are constants) Next, compare Tdp and Tw + C25 (C is a positive constant) When Tdp > (Tw + C) is satisfied, internal air circulation26 is selected, and when it is not satisfied, As the outside air is introduced 27, the process returns to the measurement 18 of the room temperature Ta. This routine is repeated at regular time intervals, for example every 30 seconds.

Note that the same members as in FIGS. 1 and 2 are given the same numbers.

As long as the surface does not become cloudy, internal air will be circulated, and if cloudy conditions are predicted in advance, the system will switch to outside air.
It can reach the set temperature in a short time without fogging the window glass.

In addition, although the method used here is to select either inside air or outside air, the same effect can be obtained by comparing the dew point temperature Tdp and the window glass equivalent temperature Tw and adjusting the opening degree of the inside and outside air damper. Needless to say.

According to the automotive air conditioner of the present invention, as described above, the effects of the invention are as follows.
The interior of the vehicle is equipped with a room temperature sensor, an outside temperature sensor, a humidity sensor, and a microcomputer that uses these data to control the inside and outside air damper, so it can ascertain the amount of water vapor in the vehicle interior and prevent condensation on the glass surfaces. Since the inside and outside air dampers are controlled by predicting the conditions, the ratio of inside air to outside air can be changed arbitrarily while preventing dew condensation from forming on the glass surface.

FIG. 1 is a block diagram of a conventional air conditioner for an automobile, FIG. 2 is a block diagram of another conventional air conditioner for an automobile, FIG. 3 is a block diagram of an air conditioner for an automobile according to the present invention, and FIG. The figure is a flowchart showing the control contents when the microcomputer starts up.

2... Heater, 4... Inside and outside air damper, 5... Damper actuator, 6... Room temperature sensor, 7... Outside temperature sensor, 8... Temperature setting unit, 10... Humidity sensor, 14...
・Microcomputer.

Name of agent: Patent attorney Toshio Nakao and one other name
11! ! Figure 2 Figure 3

Claims (1)

[Claims] A heater that heats a vehicle interior, an inside/outside air damper that changes the ratio of inside air to outside air introduced into the heater, a damper actuator that operates the inside/outside air damper, and a room temperature sensor that detects the temperature inside the vehicle interior. , an outside temperature sensor that detects the temperature of outside air, a humidity sensor that detects the humidity inside the vehicle, a temperature setting section that sets a desired temperature, and a An air conditioner for an automobile comprising a microcomputer that uses data to determine condensation conditions on window glass and controls the damper actuator.