JPS60244B2 - Vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vehicle air conditioner that controls the operation of an air conditioner to maintain an optimal vehicle interior temperature.

[Prior art]

An example of a case in which a conventional air conditioner of this type performs cooling operation will be explained with reference to FIGS. 1 to 3. In the figures,
Reference numerals 1 and 2 denote an air conditioner and an electric fan. Starting and stopping of the air conditioner 1 and the electric fan 2 are controlled by a control device 3 that inputs a detection signal of the temperature inside the vehicle, and the detection signal to the control device 3 is , is given by a temperature detector 4 installed near the suction port of the air conditioner 1 in FIGS. 2 and 3.

Further, 5 is a main circuit power source of the control device 3, 6 is an operating section, 7 is a vehicle, and 8 is a wind distribution duct. Note that FIGS. 2 and 3 show the status of passengers and the flow of cold air, with FIG. 2 showing the case when the vehicle is at capacity and FIG. 3 showing the case when the vehicle is fully occupied. In the secondary vehicle air conditioner with the above configuration, when there are few passengers as shown in Fig. 2, there is a lot of space inside the vehicle, and the cold air discharged from the whale air duct 8 is distributed throughout the interior of the vehicle. Since a good condition can be obtained in which the air is distributed and the temperature near the temperature sensor 4 is approximately equal to the temperature inside the vehicle, the air conditioner can be operated in a manner suitable for the temperature inside the vehicle.

However, as shown in Figure 3, when the car is full, the cold air is blocked by the human body and does not reach the floor area, and the cold air discharged from the air duct 8 does not cool the inside of the car sufficiently and is used for air conditioning again. Sucked into machine 1.

That is, a short circuit phenomenon occurs, and even though the inside of the car is not sufficiently cooled, the temperature detector 4 and the control device 3
The problem was that the air conditioner would stop working. Also,
When the train is full, the aim is to provide constant cold air to at least the heads of the passengers, so if the temperature setting for the air conditioner inside the car is set low, for example from 0 to 2000, continuous cooling operation will be performed even when the train is full. , when passengers get off the train and the capacity is reached, the whole body of the passengers will be cooled down.
There were drawbacks such as complaints that it was ``too cold'' or ``cold.'' [Summary of the Invention] The invention was made with the aim of eliminating the drawbacks of the conventional products as described above, and the invention as set forth in claim 1 (hereinafter referred to as the first invention) is designed to reduce the Focusing on the fact that the temperature varies depending on the number of passengers, this vehicle air conditioner is able to maintain the optimal interior temperature at all times by selecting a specific temperature set point in the vehicle according to the temperature difference between the ceiling and the floor. It provides equipment.

In addition, the invention set forth in claim 2 (hereinafter referred to as the second invention) adds a temperature detector outside the vehicle to the configuration of the first invention, thereby determining the temperature set value inside the vehicle while also taking into account the outside temperature outside the vehicle. The present invention proposes a vehicle air conditioner that can be changed arbitrarily to maintain an optimal vehicle interior temperature.

[Embodiments of the invention]

Hereinafter, one embodiment of the first invention will be explained as shown in FIGS. 4, 9 and 10.
This will be explained based on the diagram.

Fig. 4 is a block diagram showing the outline of this embodiment, Fig. 9 is a graph for calculating the temperature set value inside the car in the case of air conditioning, and Fig. 10 is a diagram showing the operating characteristics of the set temperature inside the car. In this example, the vehicle air conditioner according to the present embodiment is "vehicle 7".
first and second temperature detectors 9, 10 installed near the ceiling and near the floor of the vehicle, and a pre-input temperature set value Ts in the vehicle.
a memory circuit unit 14 for storing temperature, a temperature difference detector 13a for detecting a temperature difference based on each detection signal of the first and second temperature detectors 9 and 10, and a temperature difference detected by the temperature difference detector 13a; an arithmetic processing unit 13b that calculates a temperature command value based on a temperature value obtained by subtracting the proportional temperature value from the temperature setting value;
and an operation control section 13c that controls the operation of the air conditioner 1 based on the temperature command value. The self-temperature detector 9, 1, is composed of a thermistor whose resistance value changes with temperature changes, or a side-temperature resistor, and both of these detection signals are input to the control device 16. The signal is input to the central processing unit 13 via the output control section 12 (not shown in FIG. 4).

This central processing unit 13 includes a temperature difference detection section 13a,
It is composed of an arithmetic processing section 13b and an operation control section 13c.

In the air conditioner according to this embodiment having the above configuration, the arithmetic processing section 13b receives input of each value of the temperature difference detected by the temperature difference detection section 13a and the temperature set value stored in the storage circuit section 14. The optimum temperature inside the vehicle is calculated, and the result of this calculation is output as a temperature command value, for example as shown in FIG.

That is, if the temperature difference Td between the average value of the temperatures detected by each of the first temperature detectors 9 near the ceiling and the temperature detected by the second temperature detector 10 near the floor is 0°C, the temperature is set when cooling the inside of the car. The value Ts is 2800, and the temperature difference Td is 2℃
In this case, the temperature setting value Ts when cooling the inside of the car is 26 o'clock C.
becomes. Therefore, when the number of passengers is small, the space inside the car is large.
The detected temperature average value and the detected temperature of the second temperature detector 10 near the floor are respectively input to the temperature difference detection section 13a, and the temperature difference Ta detected by this temperature difference detection section 13a is relatively small. Assuming that the temperature difference Td is 2°C, the arithmetic processing section 13b provided in the central processing unit 13
At the same time as input, the temperature set value Ts for cooling the vehicle interior stored in the storage device 14 is set to 26°C. As shown in the operating characteristics of the in-vehicle cooling temperature set value Ts shown in FIG. When the temperature rises to 2,600 or more, the cooling operation command is output again after a period of time elapses, for example, 6 days or more, until the pressure difference between the high pressure side and the low pressure side of the compressor (not shown) is balanced after the cooling operation is stopped. Thus, the vehicle interior temperature is maintained near the vehicle interior cooling temperature set value Ts. Next, when the car is full with a large number of passengers, the cold air inside the car is blocked by human bodies and does not reach the area near the floor. The temperature difference Td from the temperature detected by the second temperature detector 1 is large.

Assuming that the temperature difference Td is 4° C., the in-vehicle cooling temperature set value Ts is set to 24° C. according to the characteristics shown in FIG. 9, and cooling operation is performed according to the operating characteristics shown in FIG. 10. Next, an embodiment of the second invention is shown in FIGS. 5 to 11.
This will be explained based on the diagram.

Fig. 5 is a block diagram showing the outline of this embodiment, Fig. 6 is a detailed block diagram of Fig. 5, Figs. 7 and 8 are schematic layout diagrams inside the vehicle, and Figs. 9 to 11 are Temperature setting values and their operating characteristic diagrams are shown when cooling the inside of a vehicle. In each of the above figures, the vehicle air conditioner according to the present embodiment has a first air conditioner installed near the ceiling and floor inside the vehicle 7, and one outside the vehicle. , the second and third temperature detectors 9, 10, 11, a storage circuit section 14 that stores the pre-input temperature set value Ts in the vehicle, and the first and second temperature detectors 9, 10. The first temperature detection unit 13a detects the temperature difference based on each detection signal, and the third temperature detector 11 installed outside the vehicle detects the temperature difference between the detection signal and the temperature set value Ts inside the vehicle. When the temperature value based on the detection signal of the second temperature difference detection unit 13d and the third temperature detector 11 is larger than the temperature setting value, the temperature difference detected by the second temperature detector 13d An in-vehicle temperature setting section 13e that sets a new temperature set value by adding a proportional temperature value to the above-mentioned in-vehicle temperature set value.
Then, a temperature command value is calculated based on a temperature value obtained by subtracting a proportional temperature value proportional to the temperature difference detected by the first temperature difference detection section 13a from the new temperature setting value set by the vehicle interior temperature setting section 13e. The arithmetic processing unit 13b and the operation control unit 1 that controls the operation of the air conditioner 1 based on the temperature command value.
3c. Next, the operation of this embodiment will be explained.

Temperature detectors 9 and 1 installed near the ceiling and floor of the vehicle 7
The detection operation of the first temperature difference detection section 13a based on each detected temperature of 0 is performed in the same manner as in the first invention, and the temperature inside the vehicle is maintained constant. Furthermore, in this state, if the temperature detected by the third temperature detector 11 rises to 28 degrees Celsius or higher, and if the temperature outside the vehicle is 30 qo as an example, the central processing unit 13 will perform the following actions as shown in FIG. As such, the car interior cooling temperature setting value Ts is 26°C - 22°C = 2
It was set at 08:00 and the temperature inside the car was 2 due to the above-mentioned cooling operation.
Maintained at 8qo. In other words, in this case, the temperature increase value (2°C) is added to the interior cooling temperature set value Ts (26qo) to become the new interior cooling temperature set value Ts (2 is o), and the temperature inside the vehicle increases due to the increase in the outside temperature. Eliminate wasteful cooling operation by increasing the set value. Note that when there are many passengers, the same operation as in the first invention is performed, and the temperature inside the vehicle is maintained constant according to the operating characteristics shown in FIG.

Furthermore, in this state, if the temperature outside the vehicle rises above 28:00, for example at 30:00, the inside cooling temperature set value Ts will be 2400°C due to the characteristics shown in Figure 11.
= 26°C, and the temperature inside the car is maintained at 26°C by the above-mentioned cooling operation. In addition, each detected temperature of the plurality of first temperature detectors 9 installed near the inlet of each air conditioner 1 near the ceiling of the car interior has a deviation of ±2°C or more from the average temperature value. If so, the central processing unit 1
3 outputs an operation command signal for the fan 2 installed on the ceiling of the car, so the fan 2 is operated in combination to equalize the temperature inside the car and at the same time provide air speed to the passengers to provide a cooling effect. Improve.

In particular, multiple air conditioners 1 mounted on the roof of a vehicle
Furthermore, when several air conditioners 1 stop abnormally due to a failure, the lack of cooling can be compensated for even a little by operating the electric fan 2 in conjunction with other air conditioners 1. [Effects of the Invention] As explained above, the first and second inventions can optimally adjust the temperature inside the car regardless of whether the car is full or full, and the short circuit of cold air at the top of the car can be achieved. It is possible to obtain a vehicle air conditioner that is always effective and highly practical, regardless of whether a phenomenon occurs.

Furthermore, the second aspect of the invention has the effect of being able to comfortably maintain the optimal temperature inside the vehicle, taking into consideration the outside temperature.

[Brief explanation of drawings]

Figures 1 to 3 show conventional air conditioners for vehicles, with Figure 1 being a control circuit connection diagram, Figure 2 being an explanatory diagram showing the riding conditions and wind flow inside the vehicle. , FIG. 4 to FIG. 11 show an embodiment of the present invention, FIG. 4 is a schematic block diagram of an embodiment of the first invention, and FIG. 5 is a schematic block diagram of an embodiment of the second invention. Fig. 6 is a detailed block diagram of Fig. 5, Figs. 7 and 8 are schematic layout diagrams inside the vehicle, Fig. 9,
Figures 10 and 11 are graphs for explaining the vehicle interior cooling temperature set value and its operating characteristics. 1...Air conditioner, 2...Fan, 9,1
0, 11...Temperature detector, 13...Central processing unit,
13a... (first) temperature difference detector, 13b.
... Arithmetic processing section, 13c... Operation control section, 13d... Second temperature difference detection section, 13e...
... In-vehicle temperature setting section, 14... Memory circuit section. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. A vehicle air conditioner that controls the operation of the air conditioner based on detection signals from a plurality of temperature detectors installed at appropriate locations in the vehicle. first and second temperature detectors, a memory circuit unit that stores a pre-input temperature set value in the vehicle, and a temperature difference that detects a temperature difference based on each detection signal of the first and second temperature detectors. a detection unit, an arithmetic processing unit that calculates a temperature command value based on a temperature value obtained by subtracting a proportional temperature value proportional to the detected temperature difference of the temperature difference detection unit from the temperature set value, and an air conditioning unit that calculates a temperature command value based on the temperature command value. An air conditioner for a vehicle, comprising: an operation control section that controls the operation of the vehicle. 2. In a vehicle air conditioner that controls the operation of the air conditioner based on detection signals from multiple temperature detectors installed at appropriate locations in the vehicle, temperature sensors installed near the ceiling and floor inside the vehicle and outside the vehicle A temperature difference is detected by the first, second and third temperature detectors, a memory circuit unit that stores the pre-input temperature set value in the vehicle, and each detection signal of the first and second temperature detectors. a first temperature difference detection section; a second temperature difference detection section that detects a temperature difference between a detection signal detected by the third temperature detector installed outside the vehicle and a temperature set value inside the vehicle; When the temperature value based on the detection signal of the third temperature detector is larger than the temperature set value, a proportional temperature value proportional to the detected temperature difference of the second temperature detector is added to the temperature set value inside the vehicle. and a proportional temperature value proportional to the temperature difference detected by the first temperature difference detection section from the new temperature setting value set by the vehicle interior temperature setting section. A vehicle air conditioner comprising: an arithmetic processing section that calculates a temperature command value based on the subtracted temperature value; and an operation control section that controls the operation of an air conditioner based on the temperature command value. Device.