JPS5973316A - Air conditioner of car - Google Patents

Abstract

PURPOSE:To simplify constitution and to prevent diffusion of the concentration force of an operator, by a method wherein, in an air conditioner with a device for displaying operation of a cooling means, a device displays cooling operation, which is rendered effective, independently from the disconnecting means of a compressor, and also displays a trouble on a coolant pressure. CONSTITUTION:PI computation is conducted on a difference between a desired set temperature and the temperature of the interior of a car room, and a deciding means 40 decides whether a result (x) is below a given value xo or not to transmit a lighting signal. Meanwhile, a flickering signal means 41 inputs a flickering signal of a specified frequency to a theoretical means 42. Thus, only when (x) is smaller than xo and the flickering signal 41 is transmitted, the flickering signal is generated. Further, a switching means 43, when a coolant pressure becomes abnormal, is switched from the deciding means 40 side to the theoretical circuit 42 side. Thus, when (x) is smaller than xo, and the flickering signal is generated, and a coolant pressure is normal, a lamp 45 is lighted ON through the working of a drive means 44 independently from the intermittent operation of a compressor. When the coolant pressure becomes abnormal, the lamp is switched to the flickering side, and flickers to alarm a trouble. This causes facilitating of detection of a trouble.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an air conditioner for an automobile as set forth in the claims, and particularly relates to an operation display device for a cooling means.

[Prior art]

The conventional operation display device displays all the cooling information when the refrigerant compressor, which is an element of the cooling means, is operated.

However, since the compressor is operated intermittently to control the temperature of the air after passing through the cooling means, the cooling display is also intermittent in response, drawing unnecessary attention from passengers and causing them to concentrate on driving. It had the disadvantage of reducing power.

Further, when the refrigerant pressure of the cooling means shows an abnormal value, the means for indicating the abnormality is provided separately from the operation display device, and the structure is accordingly complicated and costly. .

[Purpose of the invention]

An object of the present invention is to display an indication when the cooling action of the cooling means is present independently of the intermittent operation of the compressor, thereby preventing the occupant from drawing unnecessary attention and losing concentration on driving. In addition, if the refrigerant pressure of the cooling means shows an abnormal value, the abnormality is displayed using the cooling display device, thereby simplifying the configuration and reducing costs. It is on offer.

[Summary of the invention]

The present invention provides a cooling display when the cooling action of the cooling means is present, independent of the intermittent operation of the compressor. At the same time,
The same display device also displays abnormalities in refrigerant pressure.

[Embodiments of the invention]

Examples of the present invention will be described below.

FIG. 1 shows the overall configuration of an automotive air conditioner to which the present invention is applied.

In the figure, reference numeral 1 denotes a heat exchange section, which is provided with an outside air intake port 11 that goes up to the case 10 and takes in air from outside the conductor, and an inside air intake port 12 that takes in air from inside the cabin. Reference numeral 2 denotes an air-conditioned vehicle compartment, which is provided with a lower air outlet 13, an upper air outlet 14, and an air outlet 15 from the heat exchanger 1 to the vehicle interior 2 to the front windshield glass. 3 is a control unit;
is the operation section. Using the operation unit 4, it is possible to set the temperature to select the desired temperature inside the vehicle, and to set the mode of whether each component of the air conditioner is operated fully automatically or partially manually. There is. The control unit 3 outputs signals for controlling the operation of each device that constitutes the air conditioner, which will be described later, based on settings made by the operation unit 4 and inputs from various sensors of the air conditioner. Case 10 of heat exchange section 1
An inside/outside air switching door 16 is provided, and the inside/outside air switching door 16 is switched to three positions by opening and closing an electromagnetic valve in response to an electric signal from the control section 3 via a negative pressure actuator 17. A blower 19 is provided inside the case 10 and is rotated by a motor 20. A controlled voltage is applied to the motor 20 by a control section 3 to control the number of rotations, that is, the air volume of the blower 19. Further, inside the case 10, there is provided a cooler 21 which forms part of the cooling means.

This cooler 21 constitutes a refrigeration cycle including a refrigerant compressor 22, a condenser, a pressure reducer (not shown), and the like. The refrigerant compressor 22 is connected to an electromagnetic clutch 22a by an internal combustion engine of an automobile.
This electromagnetic clutch 22a is controlled by an electric signal from the control section 3, and the compressor 22 is driven or not driven. Further, on the downstream side of the cooler 21 of the case 10, a heater 23 which is part of the heating means is provided, and cooling water (warm water) for the internal combustion engine of the self-driving car is circulated through the heater 23 and passed through the heater 23. The air conditioner is configured to heat the air and condition the air in the vehicle compartment 2. The circulation of the cooling water can be stopped by closing the hot water cock 24 in response to a signal from the drug control section 3. Further, a side passage 25 is provided in the case 10 in parallel with the heater 23. A temperature control door 26 is provided to change the amount of heat radiation supplied to the passenger compartment 2 by changing the ratio of the amount of air passing through the side passage 25 and the heater 23, and controls the amount of air passing through the heater 23 from 0 to 100%. Be a sidekick. The temperature control door 26 is driven to a predetermined position by a negative pressure actuator 29 by opening and closing a solenoid valve 28 connected to a negative pressure source in response to a collateral signal from the control unit 3, and at the same time, the temperature control door 26 is driven to a predetermined position by a negative pressure actuator 29. By feeding back an electric signal from a potentiometer 30 that converts the position of 26 into an electric signal to the control unit 3, the position is set accurately at a predetermined position. As a method of driving the temperature door 26, it is of course possible to use a negative pressure servo motor that converts an electric signal from the control section 3 into negative pressure and whose stroke is determined by this pressure. Next, air is blown into the vehicle compartment 2 by opening and closing the solenoid valve 33f and the air outlet switching door 31, 32 by an electric signal from the control part 3, thereby operating the negative pressure actuator 34 to perform various germ control operations. It is structured like this. Reference numeral 27 denotes a temperature sensor such as a thermistor, which detects the temperature of the air immediately after passing through the cooler 21 and inputs it to the control unit 3 as an electrical signal. 35 is also a temperature sensor which detects the temperature of the vehicle interior 2 and inputs it to the control section 3 as an electrical signal.

FIG. 5 is a cooling display configuration diagram based on the present invention.

40 is the value of X, which will be described later. means for determining whether or not the value is smaller than that and emitting a lighting signal if it is smaller;
41 is a means for emitting a blinking signal at a constant frequency, and 42 is an AND means, which emits a lighting signal only when x<xo and 41 is emitting a lighting signal. 43 is a circuit switching means which is normally connected to the means 40, but when the refrigerant pressure becomes above the third predetermined value or below the fourth predetermined value, it is connected to the means 41; is means for driving the cooling indicator lamp 45 in accordance with the output signal 43.

FIG. 2 shows the principle of automatic temperature control employed in this embodiment. The target set temperature T set on the operation unit 4 and the vehicle interior temperature T are compared, and the temperature difference ΔT=
Calculate T, -T, tPI.

If the PI value calculation result is set as X, the following equation holds true.

x=, ΔT+, /JTdt This is a method generally used in the field of PI value calculation automatic control. Total and subject to control? Measure the amount required to transition to the target state. The control section 3 drives the heat exchange section 1 so as to send heat IQ proportional to the value of the calculation result X into the vehicle compartment 2 shown in FIG. Vehicle interior air (heat load)
receives disturbance heat QD in addition to the above-mentioned amount of heat Q. The disturbance heat QD includes heat entering from outside the vehicle, radiant heat from sunlight, heat transferred from the engine compartment, heat generated by the occupants, and the like. The air inside the vehicle is Q
In response to the heat amount of +QD, the temperature T changes with a -th lag.

This T is negatively fed back to the control section 3. In such a negative feedback split skin system, if the coefficients of each element are appropriate, T2 can be stably T,
The automatic temperature sub-leg is achieved as it is mathematically proven that it converges to .

FIG. 3 is an explanatory diagram of the operation of the heat exchange section 1 that supplies heat Q substantially proportional to the control signal X described above. The horizontal axis is the above quantity X. The area to the right of Xo is vehicle compartment 2 shown in Figure 1.
requires heating power, that is, during heating, and Xo
The area on the left is for air conditioning. When x>xo, the heating means is activated (hot water pot 24 shown in FIG. 1 is opened) and the cooling means is not activated. x (at x, the heating means does not operate, but the cooling means operates (the refrigerant compressor 22 shown in FIG. 1 operates). The temperature shown in FIG. 1 indicates the air volume of the blower 19 shown in FIG. By controlling the voltage applied to X, the maximum air volume (applied voltage journey i 4V) at
V), between X and X7 and X.

and X4 are changed linearly. An represents the amount of air passing through the inner heater 23 of the above air amount, and X.

- X3 is controlled by changing the opening degree of the temperature control door 26 shown in FIG. θ is the opening degree of the temperature control door 26 shown in FIG. 1, x (fully closed at x 6, x ) x
3 is full throttle and X. X is controlled (goods) between and X5. −
Increase AH linearly between X4.

T6 is the temperature of the air immediately after passing through the cooler 21 shown in FIG. , the refrigerant compressor 22 shown in FIG. 1 is made non-operational (driving and non-driving).

Amount of heat radiated to the passenger compartment 2 due to the above operation Q (x<X.

(becomes negative in the cooling region) is shown in FIG. x (x, is maximum cooling time f, x) x4 indicates maximum heating time. x, (x (x, is the range that linearly controls the amount of heat Q. In the above range,
It is expressed as c('I', -T,)A, where ('I', -T,) is almost constant and A changes linearly, so Q changes linearly. When xt<X<Xo, A is constant and (T, -T,) changes linearly, so Q also changes linearly. When
n T v ) X A n (THT
-) is almost constant, and since AM changes linearly, Q changes linearly. Here, T)I is the air temperature immediately after passing through the heater 21, and X>x.

It is possible to keep it almost constant.

Therefore, the amount of heat released from the heat exchange section 1 uniformly and monotonically changes from the maximum cooling power to the maximum heating power with respect to a change in the amount X corresponding to the required amount of heat in the southeast 2.

The image configuration can be easily realized using general electronic circuits, and even easier if a microcomputer is used.

However, an abnormality in refrigerant pressure is transmitted to this child circuit in the form of a drowsiness signal from a commonly used pressure switch.

Therefore, in the state where the cooling means is operating, that is, performing a cooling effect (x (x.), the means of 40 or the lighting signal is emitted,
the refrigerant pressure is less than or equal to a third predetermined value and greater than or equal to a fourth predetermined value;
That is, in a normal state, the means 43 transmits the output signal +i of the means 400 to the drive circuit 44, so that the cooling display screen 45 lights up.

The current light is independent of the compressor being operated intermittently for cooling power regulation.

When the means 40 issues a lighting signal and the refrigerant pressure is not at a normal value even in the cooling state, the means 43 turns on the light signal.
1 blinking signal f: The cooling indicator lamp blinks in order to transmit it to the drive circuit 44.

However, even if the refrigerant pressure shows an abnormal value in a state where there is no cooling effect (X≧xo), this is not abnormal for the cooling means, so depending on the action of the logical product means of 42,
The flashing will be removed and the indicator lamp will turn off.

According to the embodiment of the present invention, the cooling display displays the cooling operation state of the air conditioner regardless of the intermittent operation of the refrigerant compressor, so that the cooling display does not cause unnecessary attention to the occupants. If the problem is removed and the refrigerant pressure is not at the normal value even though the cooling function is in effect, the same display will be used to inform the crew of the abnormality in the cooling means, instead of two conventional display devices. This has the effect of reducing costs.

According to the present invention, since the display does not flash during the cooling operation, it does not attract unnecessary attention to the occupants and impair their concentration on driving. Since the information is communicated to the occupant using the display device, the cost is reduced.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of an automobile air conditioner to which the present invention is applied, Fig. 2 is an illustration of the control principle of the air conditioner, and Fig. 3 is an explanation of the operation of the heat exchange section of Fig. 1. 4 shows the amount of heat radiated into the vehicle interior, and FIG. 5 shows the cooling display structure of the present invention. DESCRIPTION OF SYMBOLS 1...Heat exchange part, 2...Vehicle compartment, 3...Control department, 4...Operation part, 19...Blower-121...Cooler, 23...Heating Vessel, 25...Sideway, 26...
Air distribution crime, 4o... Judgment means, 41... Flashing signal means, 42... Logical product means, 43... Switching means, 44.
...Drive circuit, 45...Cooling indicator lamp. Figure 2 Figure 1 Figure 3

Claims (1)

[Claims] 1. Provided with both cooling and heating means, only the heating means is operated when heating power is required for the interior of the vehicle in order to automatically control the interior of the vehicle to a desired set temperature. and when the required heating power is smaller than a first predetermined value,
Controlling the air distribution door to minimize the blower air volume and changing the allocation of the air passing through the heating means within the duty, and when the required heating power is greater than the first predetermined value, the ratio approaches 100%. At the same time, the blower air box is increased, and after the ratio reaches 100%, the blower air volume is further increased, and when the vehicle interior requires cooling power, only the cooling means is used. When the required cooling power is smaller than a second predetermined value, the blower air volume is minimized, and the temperature of the worker after passing through the cooling means is controlled by intermittent operation of the cooling means. However, when the required cooling power is greater than the second predetermined value, the temperature is increased to the lowest possible value, the blower air volume is fully increased, and after the minimum value is lowered, the blower air volume is further increased. 1. An air conditioner for an automobile having a device for displaying the operation of the cooling means to a passenger, wherein the display is independent of the intermittent operation. 2. In claim 1, it is provided that the pressure of the refrigerant used in the cooling means is equal to or higher than a third predetermined value or equal to or lower than a fourth predetermined value. The air conditioner characterized in that when the air conditioner is detected, the display is different from the operation display of the cooling means.