JPH0585157A - Vehicle air conditioning controller - Google Patents

Abstract

(57) [Summary] [Purpose] To set a comfortable vehicle interior environment according to individual differences and improve energy-saving effects. [Structure] Evaporator introduction air temperature sensor 40, evaporator temperature sensor 41, air volume selection switch 2 for outputting a signal in accordance with the selection of air volume level, and evaporator temperature reaches a predetermined compressor on / off evaporator temperature. In this case, the microcomputer 1 for controlling on / off of the compressor 39 connected to the evaporator via the magnet clutch relay drive circuit 45 is provided. Then, the microcomputer 1 has a plurality of relay switching maps corresponding to the air volume that is predetermined so as to be optimal depending on the relationship between the evaporator-introduced air temperature and the evaporator temperature, and the microcomputer 1 has the air volume selection switch. A relay switching map is selected according to the air flow level by the output of 2, and the compressor on / off evaporator temperature corresponding to the air flow and the evaporator-introduced air temperature is set based on the selected replacement map.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioning control device, and more particularly to a vehicle air conditioning control device applied to an air conditioning system for energy saving measures.

[0002]

BACKGROUND ART Nowadays, the problem of energy saving is a socially important problem, and many air conditioners for vehicles (car air conditioners) have been considered in consideration of energy saving.
On the other hand, maintaining the vehicle interior environment in a comfortable state immediately or stably is one of the important factors for safe driving.

FIGS. 4 to 5 show a conventional car air conditioner system for energy saving. Among these, FIG. 4 is a diagram showing a configuration of an air conditioner (air conditioner), and FIG. 5 is a diagram showing a configuration of an air conditioner control device for controlling this air conditioner. The air conditioner shown in FIG. 4 includes a blower fan (blower fan) 31, an evaporator 32 which is a kind of heat exchanger disposed on the downstream side (right side in the figure) of the blower fan 31, and the evaporator 32. A heater core 33 disposed on the downstream side, an inside / outside air damper 34 for switching the inside / outside air taken into the air conditioner, an air mix damper 35 for adjusting the blowing temperature, and a defroster damper 36 for switching the outlet. , A ventilator damper 37 and a foot damper 38. A compressor 39, which forms a part of a cooling cycle together with the evaporator 32, is connected to the evaporator 32. By driving the compressor 39, a refrigerant is sent into the evaporator 32, and the refrigerant is exchanged with air in a blower path. The heat is exchanged between the air to cool the air. The engine cooling water is sent to the heater core 33 through the cooling water passage, and the heat in the cooling water warms the air in the air passage. In this air conditioner, the opening and closing of various dampers and the adjustment of the strength (air volume level) of the blower fan are manually performed by an external operation. Here, evaporator 3
An evaporator introduction air temperature sensor 40 for detecting the temperature of the evaporator introduction air and an evaporator temperature sensor 41 for detecting the temperature of the evaporator 32 are installed on the upstream side and the downstream side of 2, respectively.

Further, the air conditioning control device shown in FIG. 5 has an air conditioner switch 43 for stopping driving of an air conditioner, an evaporator introduction wind temperature sensor 40, and an evaporator temperature sensor 4.
1, a microcomputer (hereinafter referred to as “microcomputer”) 44, and a magnet clutch relay drive circuit 45. Here, the output of the air conditioner switch 43 is directly, and the outputs of the evaporator introduction air temperature sensor 40 and the evaporator temperature sensor 41 are the interface circuit 4
6 is transmitted to the microcomputer 44. Magnet clutch relay drive circuit 45
Is a circuit for driving a magnet clutch relay (not shown) that controls ON / OFF (OFF) of a magnet clutch (not shown) provided in the compressor 39. When the magnet clutch is ON, the rotation of the engine is transmitted to the compressor 39. The compressor 39 is transmitted to drive the compressor 39, and when the magnet clutch is off, the rotation of the engine is not transmitted to the compressor 39, so that the compressor 39 is stopped.

A magnet clutch relay switching map as shown in FIG. 6 is stored in the internal memory of the microcomputer 44, and the microcomputer 44 turns on and off the magnet clutch relay according to the temperature of the air introduced into the evaporator by this map. The compressor on / off evaporator temperature which is the temperature of the evaporator 32 for turning on / off the compressor 39 is set, and the magnet relay is turned on / off based on the set compressor on / off evaporator temperature. Was turned on and off.

[0006]

However, in the above-mentioned conventional car air-conditioning system for energy saving, there is only one map for switching the magnet clutch relay, but there are individual differences in the sense of heat and cold and the comfort. Therefore, the following problems have occurred.

It is conceivable that some people may feel hot at the beginning and end of summer even if the vehicle interior temperature is the same, and some people feel that the temperature is just right. In the case of the former, it is considered that one wants a cooler wind, but at the temperature of the evaporator-introduced air of θ ₁ in FIG. 3, it is not possible to blow out the cool air of the air conditioning capacity limit of the air conditioner. I think that I do not want cold air so much, but the temperature of the air introduced into the evaporator is θ
_At a temperature of ₁ , the air conditioner has the cooling capacity to match it, resulting in energy loss.

It is considered that the same problem as described above occurs at the time of changing seasons such as early winter, late winter, early spring, late spring, early autumn and late autumn.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to realize a comfortable passenger compartment environment setting according to individual differences.
An object of the present invention is to provide a vehicle air conditioning control device that can improve the energy saving effect.

[0010]

A vehicle air-conditioning control device according to the present invention includes an evaporator-introduced air temperature sensor for detecting the temperature of air introduced into an evaporator in the air-conditioning device, and an evaporator temperature sensor for detecting the temperature of the evaporator. , An air volume selection switch that outputs a signal indicating the air volume level according to the selection of the air volume level, and a compressor connected to the evaporator is turned on via a magnet clutch relay drive circuit according to a predetermined compressor on / off evaporator temperature. -It is provided with a control means for controlling off. And this control means has a plurality of magnet clutch relay switching map according to the air volume predetermined to be optimal depending on the relationship between the evaporator introduction air temperature and the evaporator temperature, and the control means, A map selection function that selects the magnet clutch relay switching map according to the air volume according to the output signal of the selection switch, and the compressor on / off evaporator temperature corresponding to the air volume and evaporator introduced air temperature based on the selected magnet clutch relay switching map. It has a compressor on / off evaporator temperature setting function for setting. With such a configuration, the above-described object is to be achieved.

[0011]

In the control means, first, the outputs of the evaporator-introduced air temperature sensor, the evaporator temperature sensor, and the air volume selection switch are fetched. Next, the control means selects a magnet clutch relay switching map according to the air volume by the output signal of the air volume selection switch, and based on this selected magnet clutch relay switching map, the compressor on / off corresponding to the air volume and the evaporator-introduced air temperature is selected. Set the evaporator temperature for turning off. Then, the control means performs on / off control of the compressor based on each of the set compressor on / off evaporator temperatures. As a result, optimum air conditioning control is performed with respect to the air volume and the temperature of the air introduced into the evaporator.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. Here, the same reference numerals are used for the same or equivalent components as those of the above-described conventional example, and the description thereof will be simplified or omitted.

The embodiment shown in FIG. 1 relates to an air conditioning controller for controlling an air conditioner (air conditioner) having the same structure as that shown in FIG. In this embodiment, an air conditioner switch 43 for stopping the driving of the air conditioner, an evaporator introduction air temperature sensor 40 for detecting the temperature of the air introduced into the evaporator 32 (see FIG. 4) in the air conditioner, and the temperature of the evaporator 32 are detected. An evaporator temperature sensor 41,
An air volume selection switch 2 that outputs an output signal indicating the air volume level (high / medium / low) according to the selection of the air volume level, and a predetermined compressor on / off evaporator temperature TON / TOF
The microcomputer 1 is provided as control means for controlling on / off of the compressor 39 connected to the evaporator 32 according to F via a magnet clutch relay drive circuit 45.

Here, the output of the air conditioner switch 43 is directly output, the outputs of the evaporator-introduced air temperature sensor 40 and the evaporator temperature sensor 41 are output via the interface circuit 46, and the output of the air volume selection switch 2 is output via another interface circuit 3. , Respectively, can be transmitted to the microcomputer 1.

In the internal memory of the microcomputer 1, there are three types of magnet clutch relay switching maps corresponding to the air flow levels which are predetermined to be optimal depending on the relationship between the temperature of the air introduced into the evaporator and the temperature of the evaporator as shown in FIG. Is stored, the microcomputer 1 selects a magnet clutch relay switching map according to the air volume level by the output signal of the air volume selection switch 2, and the air volume and the evaporator-introduced air temperature are selected based on the selected magnet clutch relay switching map. Set the corresponding compressor on / off evaporator temperatures TON and TOFF, and set the set T
On / off of the compressor 39 is controlled by turning on / off a magnet clutch relay (not shown) based on ON / TOFF.

The map of FIG. 2 will now be described. The high map indicated by the alternate long and short dash line in the figure is a magnetic clutch relay switching map when the passenger selects the maximum airflow level, and the middle map indicated by the solid line in the figure. Is a magnet clutch relay switching map when the passenger selects the medium level air volume, and a low map indicated by a dotted line in the figure is a magnet clutch relay switching map when the passenger selects the lowest level air volume. Of these, on the high map,
In the part where the temperature of the air introduced into the evaporator is higher than that in the middle map or low map, the evaporator temperature for compressor on / off TON / TOFF is set to a low value so that cold air near the compressor capacity limit can be output. In the part where the temperature of the air introduced to the evaporator is low,
ON / TOFF is set to a high level to enhance the energy saving effect. The middle map is a standard map and is the same as the conventional map (see FIG. 6). In the low map, the compressor on / off evaporator temperature TON / TOFF is set higher in the part where the evaporator introduction air temperature is higher than in the middle map and high map, thereby increasing the energy saving effect and vice versa. In the part where the temperature of the air introduced to the evaporator is low, TON and TOFF are set low so that comfortable air can be produced.

Cooling is required in a portion where the temperature of the air introduced into the evaporator is high, and heating is required in a portion where the temperature of the air introduced into the evaporator is low, but the reason why the passenger feels cold when cooling is because of the feeling of coldness. , Because it is thick to raise the air volume level. The opposite is true for heating. The three types of maps in FIG. 2 are set so that the passengers' heat and cold intervals can be softened and comfortable by switching the air volume levels.

Next, the control operation of the microcomputer 1 in this embodiment will be described with reference to the flowchart showing the control program of FIG. When the passenger of the vehicle turns on the air conditioner switch 43, this control program starts, and the microcomputer 1 performs a predetermined initialization (step S101). Next, the microcomputer 1 reads the evaporator introduction wind temperature, the evaporator temperature, and the air flow level from the evaporator introduction air temperature sensor 40, the evaporator temperature sensor 41, and the air flow rate selection switch 2, respectively (step S102).

Next, the microcomputer 1 determines which level the airflow level is (step S103). And
In the microcomputer 1, if the air volume level is low, the low map is selected (step S104), if the air volume level is medium, the middle map is selected (step S105), and if the air volume level is high, the high map is selected. Select (Step S
106).

Next, in the microcomputer 1, step S104
~ Based on the map selected in S106, the evaporator temperature for compressor on / off TON / TOFF
Is set (step S107).

Next, in the microcomputer 1, the set TON
On / off control of the compressor 39 via the magnet clutch relay drive circuit 45 based on TOFF (step S108), and the air conditioner switch 43
It is determined whether or not is turned off (step S109). If the air conditioner switch 43 is not turned off, the process returns to step S102, and the air conditioner switch 4
3 is turned off and the determination in step S109 becomes affirmative, the above control operation (steps S102 to S10) is performed.
Repeat 9).

According to the present embodiment described above, since the optimum air conditioning control is performed with respect to the air volume and the temperature of the air introduced into the evaporator, it is possible to set a comfortable vehicle interior environment according to individual differences. The energy saving effect can be improved. In the above description, a so-called manual air conditioner is taken as an example, but the present invention can also be applied to a so-called automatic air conditioner.

[0023]

As described above, according to the present invention,
The control means selects a plurality of magnet clutch relay switching maps according to the air volume which is predetermined so as to be optimal depending on the relationship between the evaporator-introduced air temperature and the evaporator temperature, and the selected magnet clutches are selected. Based on the relay switching map, the evaporator on / off evaporator temperature corresponding to the air volume and the temperature of the air introduced into the evaporator is set, and the compressor is on / off controlled based on the set compressor on / off evaporator temperature, respectively. As a result, optimal air conditioning control is performed with respect to the air volume and the temperature of the air introduced into the evaporator, and it is possible to set a comfortable vehicle interior environment according to individual differences and at the same time improve energy-saving effects. Providing an outstanding vehicle air conditioning control device Door can be.

[0024]

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a diagram showing a magnet clutch relay switching map stored in an internal memory of the microcomputer shown in FIG.

FIG. 3 is a flowchart showing a control program of the microcomputer of FIG.

4 to 6 are diagrams for explaining a conventional car air conditioner system for energy conservation.

[Explanation of symbols]

 1 Microcomputer as control means 2 Air volume selection switch 39 Compressor 40 Evaporator introduction wind temperature sensor 41 Evaporator temperature sensor 45 Magnet clutch relay drive circuit

Claims (1)

[Claims] 1. An evaporator-introduced air temperature sensor for detecting the temperature of air introduced into an evaporator in an air conditioner, an evaporator temperature sensor for detecting the temperature of the evaporator, and the air volume level according to selection of the air volume level. An air flow rate selection switch for outputting a signal, and a control means for controlling on / off of a compressor connected to the evaporator according to a predetermined compressor on / off evaporator temperature via a magnet clutch relay drive circuit, the control The means has a plurality of magnet clutch relay switching maps according to a predetermined air volume so as to be optimal depending on the relationship between the evaporator introduction air temperature and the evaporator temperature, and the control means includes the air volume selection. According to the output signal of the switch, the magnet clutch according to the air volume level A map selection function for selecting a relay switching map and a compressor on / off evaporator temperature setting for setting the compressor on / off evaporator temperature corresponding to the air volume and the evaporator-introduced wind temperature based on the selected magnet clutch relay switching map An air conditioning control device for a vehicle, which has a function.