JPH0338424A - Controller for air conditioner - Google Patents

Abstract

PURPOSE:To conduct control which has few change factors and which is stable, by providing a detection mechanism and a setting mechanism for the suction pressure of a compressor, and after the completion of time limit of a timer, changing a mechanism which conducts the change of inner air introduction to/from outer air introduction, into inner air introduction. CONSTITUTION:A suction pressure switch 4 is equipped with a function that detects the suction pressure of a compressor 1, a function that sets a free pressure value and a function that issues a signal for the commencement of a time limit to a timer 7 when a detected pressure value is less than a pressure value which has been previously set. One pole of the suction pressure switch 4 is connected to the positive side of a battery 6 through an air conditioner switch 5, and the other pole is connected to one pole of the timer 7. The timer 7 commences the time limit when it has received a signal from the suction pressure switch 4, and when a predetermined time set previously has elasped, sends a signal to an inner air/outer air changeable motor 8, and the motor 8 is driven, The inner air/outer air changeable motor 8 drives an inner air/outer air changeable damper 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioner control device that can be applied to an auto air conditioner for automobiles and achieve good results.

(Prior Art) Automatic air conditioners for automobiles are designed to naturally introduce outside air, cool it, and supply it to the interior of the vehicle when the interior temperature of the vehicle is high after the vehicle has been parked in the scorching sun. On the other hand, when the indoor temperature drops to the same level as the outside air temperature or lower, the sound path circulates the indoor air and cools it. Please refer to Japanese Utility Model Publication No. 57-46174 for prior art that requires measurement of outside air temperature in this manner.

(Problems to be Solved by the Invention) Although the automatic heavy-duty automatic air conditioner is subject to the above-mentioned controls, the outside temperature does not remain constant. The sound path is difficult to measure because it is unstable from start to finish due to +ff, wind speed, etc.For this reason, it has been difficult for conventional auto air conditioners for automobiles to obtain a stable indoor temperature.

The present invention has been made in view of this point, and it is an object of the present invention to provide an air conditioner control device that can obtain a stable indoor temperature without measuring outside air humidity, which is difficult to actually measure. .

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides a compressor suction pressure detection mechanism and a setting mechanism (
In addition to providing a suction pressure switch 4), a timer 7 that starts for a limited time when the detected value is below a set value is provided, and after the time limit of the timer 7 expires, a mechanism (inside/outside air switching motor) that switches between internal air introduction and outside air introduction is provided. 8 and the inside/outside air switching damper 9) are configured to be switched to the inside air side.

(Function) With such a configuration, the suction pressure switch 4 is provided as a suction pressure detection mechanism and a setting mechanism for the suction pressure of the compressor 1, and the set value to this suction pressure switch 4 and the output of the detection mechanism ( By providing a comparison mechanism that compares the pressure with This means that the inside/outside air switching damper 9) can be switched to the inside air side.

(Example) An example of the present invention will be described below with reference to FIG. l
2 is a compressor, and 2 is a boob that receives driving force from an engine (not shown).

This compressor 1 sucks a medium through a suction pipe 3, compresses it, and discharges it to a discharge outlet 7 (not shown) to perform a so-called refrigeration cycle. A suction pressure switch 4 is attached to a portion of the suction pipe 3 close to the compressor l. This suction pressure switch 4 has the function of detecting the suction pressure of the compressor l, the function of setting an arbitrary pressure hn, and the function of setting an arbitrary pressure hn. It also has a function to issue a signal to start the time limit.

The suction pressure switch 4 has a negative pole connected to the t side of the battery 6 via the air conditioner switch 5, and the other pole connected to one pole of the timer 7.

The negative side of battery 6 and the other pole of timer 7 are grounded (vehicle body grounded)
has been done. The timer 7 starts a time limit when receiving a signal from the suction pressure switch 4, and when a preset predetermined time has elapsed, sends a signal to the inside/outside air switching motor 8 to drive it. The inside/outside air switching motor 8 is connected to an inside/outside air switching damper 9 via a speed reduction mechanism with an appropriate speed reduction ratio (not shown), and drives this inside/outside air switching damper 9. A blower 1) is provided in the duct IO located downstream of the inside/outside air switching damper 9, and is configured to send air to the core +2 (Illll).

In this air conditioner control device configured as described above, a suction pressure switch 4 is provided as a detection mechanism and a setting mechanism for the suction pressure of the compressor l, and a setting value for the suction pressure switch 4 and the detection mechanism are By providing a comparison mechanism that compares the output value with the output value, when the output value of this comparison mechanism is less than the pressure value (-3.5 kg/am" for example) set in the setting mechanism (suction pressure switch 4), After the time set in the timer 7 (for example, 3 minutes) has expired, the mechanism for switching between inside air and outside air can be switched to the inside air side. No. Steps 13 to 17 in the flowchart diagram in Section 2 show the above operations.

(Effects of the Invention) Since the present invention is an air conditioner control device configured as described above, the switching time between inside and outside air is detected using the suction pressure of the compressor, so there are fewer factors that change as in the past. , stable control can be performed.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is a flowchart explaining the operation of the IT diagram. - Compressor 3 - Suction pipe 4 - Suction pressure switch 5 - Air conditioner switch 6 - Battery 7 - Timer 8 - Inside/outside air switching motor 9 - Inside/outside air switching da: Nova patent

Claims (1)

[Claims] (1) A vehicle air conditioner that switches between inside and outside air is equipped with a detection mechanism and a setting mechanism for the suction pressure of the compressor, as well as a timer that starts a time limit when the detected value is less than a set value. An air conditioner control device, characterized in that, after the timer expires, a mechanism for switching between introducing inside air and introducing outside air is configured to switch to the inside air side.