JP3102517B2 - Vehicle air conditioning controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art The problem of energy saving is a socially important problem nowadays, and many air conditioners for vehicles (car air conditioners) that take energy saving into consideration have come to be seen.
As a control device for a vehicle air conditioner in consideration of this energy saving, a compressor on / off for turning on / off a magnet clutch relay for turning on / off a compressor for sending refrigerant to an evaporator in the air conditioner. Evaporator temperature T _ON , T _OFF
As shown in FIG. 4, it is known that the temperature of the evaporator introduction wind is set to be lower when the evaporator introduction wind temperature is high, and to be higher as the evaporator introduction wind temperature is lower, within a certain range. I have. According to this, when the temperature of the air introduced by the evaporator is low, the ON time of the compressor is shortened, and the operation efficiency and energy efficiency of the air conditioner can be improved.

[0003]

However, as in the above prior art, the temperature of the evaporator for turning on / off the compressor is changed in accordance with the temperature of the air introduced into the evaporator, thereby saving energy. However, when the passenger switches from the outside air introduction mode to the inside air introduction mode by the inside / outside air switching lever during cooling, the temperature of the evaporator introduction wind decreases because cold air in the passenger compartment is introduced into the evaporator. Therefore, as is clear from FIG. 4, the evaporator temperatures T _ON and T _OFF for turning on and off the compressor are increased, the on-time of the compressor is shortened, and the outlet temperature is increased before switching. For this reason, there is a disadvantage that the occupant feels discomfort, and in such a case, there is a disadvantage that the cooling ability is deemed to have decreased and the user has to take an action against energy saving such as strengthening the cooling.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems of the prior art, and has as its object to reduce energy consumption and comfort in a vehicle compartment even when the mode is switched to an inside air introduction mode during cooling. An object of the present invention is to provide a vehicle air-conditioning control device capable of achieving both.

[0005]

In order to achieve the above object, an air conditioner control device for a vehicle according to the present invention comprises an air conditioner switch for stopping driving of an air conditioner and a temperature of wind introduced into an evaporator in the air conditioner. An evaporator introduction temperature sensor for detecting, an evaporator temperature sensor for detecting the evaporator temperature, and a compressor connected to the evaporator based on a compressor on / off evaporator temperature set in accordance with the evaporator introduction air temperature, via a drive unit. An air conditioning control device for a vehicle, comprising: an air conditioning control device for controlling the on / off control of the air conditioner. When it is determined by the output of the switching detection means that the inside air introduction mode has been set, immediately before switching to the inside air introduction mode. It is configured as characterized in having an evaporator introducing air temperature holding function of holding the Baporeta introducing air temperature.

[0006]

When the mode is switched from the outside air introduction mode to the inside air introduction mode during cooling, the control means judges that the mode has been switched to the inside air introduction mode by the output of the inside / outside air switching detection means, and the evaporator introduction wind immediately before switching to the inside air introduction mode. The temperature is maintained, and the compressor is turned on and off based on the compressor on / off evaporator temperature set in accordance with the temperature.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS.

The air-conditioning control device of the embodiment shown in FIG.
This controls an air conditioner (air conditioner) as shown in FIG. Therefore, the configuration of the air conditioner shown in FIG. 2 will be described first.

The air conditioner shown in FIG. 2 includes a blower fan (blower fan) 1, an evaporator 2 which is a kind of heat exchanger disposed downstream (to the right in the figure) of the blower fan 1. A heater core 3 disposed downstream of the evaporator 2, an inside / outside air damper 4 for switching inside / outside air taken into the air conditioner, an air mix damper 5 for adjusting ventilation temperature, and a switch for an outlet. , A defroster damper 6, a ventilator damper 7, and a foot damper 8. A compressor 9 which forms a part of a cooling cycle together with the evaporator 2 is connected to the evaporator 2. When the compressor 9 is driven, a refrigerant is sent into the evaporator 2, and the refrigerant is supplied to the air in an air passage. Heat is exchanged between the air and the air to be cooled. The engine cooling water is supplied to the heater core 3 through a cooling water passage, and the heat in the cooling water heats the air in the air passage. In this air conditioner,
The opening and closing of various dampers and the adjustment of the strength of the blower fan 1 are manually performed by an external operation.

Next, the air conditioning control device shown in FIG. 1 will be described. The air conditioning control device shown in FIG. 1 includes an air conditioner switch (air conditioner SW) 13 for stopping the operation of the air conditioner and an inside / outside air switch (inside / outside air SW) as inside / outside air switching detection means for detecting the setting of the inside / outside air introduction mode of the air conditioner. ) 14
An evaporator introduction temperature sensor 10, an evaporator temperature sensor 11, an air conditioner AMP controller (hereinafter, referred to as a "controller") 20 as control means,
Magnet clutch relay drive circuit 12 as drive unit
And

More specifically, the evaporator introduction temperature sensor 10 and the evaporator temperature sensor 11 are shown in FIG.
As shown in (1), they are installed near the upstream and downstream of the evaporator 2, respectively. These temperature sensors 10, 1
1 is actually composed of a thermistor or the like. The evaporator introduction temperature sensor 10 is connected to the evaporator 2 in the air conditioner.
The evaporator temperature sensor 11 detects the temperature of the evaporator, that is, the temperature of the wind immediately after leaving the evaporator 2. A / D converters 15 and 16 are provided at output stages of the evaporator introduction temperature sensor 10 and the evaporator temperature sensor 11, and correspond to detected temperatures output from the evaporator introduction temperature sensor 10 and the evaporator temperature sensor 11. If the analog signal is
The signals are digitized by the converters 15 and 16 and input to the controller 20.

The controller 20 is constituted by a microcomputer, and its internal memory stores an algorithm program as shown in FIG. 3 and a control map similar to that of FIG. 4, based on these. The controller 20 turns on / off the compressor 9 as described later.
Off control is performed.

The above-mentioned magnet clutch relay drive circuit 1
Reference numeral 2 denotes a circuit for driving a magnetic clutch relay (not shown) for controlling the ON (OFF) and OFF (OFF) of a magnetic clutch (not shown) provided in the compressor 9. And the compressor 9 is driven, and when the magnet clutch is off, the rotation of the engine is not transmitted to the compressor 9 so that the compressor 9 stops.

The inside / outside air switch 14 is a switch that is turned on / off in conjunction with an inside / outside air switching lever (not shown) operated by a passenger. Here, the inside / outside air switch 1
4 is turned on when the inside / outside air damper 4 is in the outside air introduction mode at the position indicated by the dotted line in FIG. 2, and is turned off when the inside / outside air damper 4 is in the inside air introduction mode at the position indicated by the solid line in FIG.

In FIG. 1, an air conditioner switch 1 is shown.
The outputs of the switch 3 and the inside / outside air switch 14 are input to a CPU (Central Processing Unit) (not shown) after waveform shaping by an input interface circuit (not shown) in the controller 20 because of the Hi / Lo signal.

Next, the controller 20 in the present embodiment
Will be described with reference to the flowchart of FIG. When an ignition switch (not shown) is turned on to start the engine, power is supplied to the controller and each sensor, and the control program starts.
(It is assumed that predetermined initial settings have been made simultaneously with the start.)

First, the controller 11 sets a set value, that is, the air conditioner switch 13 and the inside / outside air switch 14 in this case.
(Hi or Lo) and sensor values, ie, the evaporator introduction wind temperature and the evaporator temperature in this case,
It is determined whether the inside / outside air switch 14 is on (steps S101, S102). When the inside / outside air switch 14 is on, that is, in the outside air introduction mode, the data of all set values and sensor values is updated (step S).
103). Here, for example, if the air conditioner switch 13 is on and the outside air introduction mode is set, the output of the air conditioner switch 13 is Hi and the output of the inside / outside air switch 14 is Hi, so the controller 20 sets these set values to “1”. Then, the evaporator introduction wind temperature and the evaporator temperature are respectively updated, and in step S105, the compressor 9 is turned on / off by turning on / off a magnet clutch relay (not shown) according to a control map similar to that of FIG.

In this way, the controller 20 controls the compressor 9 to be turned on and off, and after a certain period of time, if the determination in step S102 is negative, that is, the inside / outside air switch 14 is turned off. In this case, the controller 20 determines that the mode has been switched to the inside air introduction mode, and proceeds to step S104 to update the data of the set values and sensor values other than the evaporator introduction temperature. That is, the controller 20 holds the value of the evaporator introduction air temperature immediately before switching to the inside air introduction mode. Then, in the controller 20, step S105
The evaporator temperature T _ON・ T _OFF for turning on / off the compressor corresponding to the fixed evaporator introduction air temperature
Is set according to the control map, and the compressor 9 is turned on.
Control off. This control state continues until switching from the inside air introduction mode to the outside air introduction mode is set.

In this manner, the on / off control of the compressor 9 is repeatedly performed, and after the elapse of a certain time, the air conditioner switch 13 is turned off.
The output of 3 becomes Lo, and the controller 20 updates the set value to “0” in step S103 or S104, and stops the compressor 9 in step S105.
When the air conditioner switch 13 is turned on again, the on / off control of the compressor 9 as described above is performed again.

As described above, according to the present embodiment,
During cooling, when the mode is switched from the outside air introduction mode to the inside air introduction mode, the controller 20 controls the inside / outside air switch 14.
It is determined that the mode has been switched to the inside air introduction mode by the output of the evaporator, and the value of the evaporator introduction wind temperature immediately before switching to the inside air introduction mode is held, and the evaporator temperature T _ON / T _OFF for compressor ON / OFF set in accordance with this is maintained. On / off control of the compressor 9 is performed based on this. Therefore, even when the mode is switched from the outside air introduction mode to the inside air introduction mode, there is no inconvenience such as a sudden rise in the blowout temperature, so that the passenger does not feel discomfort or feel that the cooling capacity has decreased. In addition, there is no danger of taking actions that are against energy saving, such as increasing cooling. Further, since the cooled room air is circulated, the cooling efficiency can be improved. On the other hand, when the outside air introduction mode is maintained, the evaporator temperatures T _ON and T _OFF for turning the compressor on and off are variably set as before according to the evaporator introduction wind temperature, and the conventional energy saving control is performed.

[0021]

As described above, according to the present invention,
During cooling, when the mode is switched from the outside air introduction mode to the inside air introduction mode, the control means retains the value of the evaporator introduction wind temperature immediately before switching to the inside air introduction mode, and sets the compressor on / off evaporator temperature which is set accordingly. On / off control of compressor based on
When the mode is switched from the outside air introduction mode to the inside air introduction mode, it is possible to prevent the inconvenience that the blowout temperature rises suddenly, and thereby the passenger feels discomfort or the cooling capacity decreases and the air conditioning is reduced. It is possible to eliminate the risk of taking an action against energy saving, such as strengthening, and to circulate the cooled indoor air, thereby improving the cooling efficiency. On the other hand, if the setting of the outside air introduction mode is kept as it is, the evaporator temperature for turning on / off the compressor is variably set in accordance with the evaporator introduction air temperature, so that the conventional energy saving effect can be maintained. Therefore, it is possible to provide an unprecedented excellent vehicle air conditioning control device that can achieve both energy saving and comfort in the vehicle compartment even when the mode is switched to the inside air introduction mode during cooling.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a vehicle air conditioning control device according to the present invention.

FIG. 2 is a diagram showing a configuration of an air conditioner controlled by the control device of FIG.

FIG. 3 is a flowchart showing a control program of a controller of FIG. 1;

FIG. 4 is a diagram showing an example of a control map for energy saving.

[Explanation of symbols]

2 evaporator 9 compressor 10 evaporator introduction temperature sensor 11 evaporator temperature sensor 12 magnet clutch relay drive circuit as drive unit 13 air conditioner switch 14 inside / outside air switch as inside / outside air switching detection means 20 air conditioner AMP controller as control means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-158118 (JP, A) JP-A-63-61624 (JP, A) JP-A-4-303014 (JP, A) 95318 (JP, U) JP-A 62-130917 (JP, U) JP-A 2-92310 (JP, U) JP-A 62-19412 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60H 1/32

Claims (1)

(57) [Claims] An air conditioner switch for stopping driving of an air conditioner; an evaporator introduction temperature sensor for detecting a temperature of wind introduced into an evaporator in the air conditioner; an evaporator temperature sensor for detecting a temperature of the evaporator; A vehicle air-conditioning control device comprising: a control unit that controls on / off of a compressor connected to an evaporator via a drive unit based on a compressor on / off evaporator temperature set according to the evaporator introduction wind temperature. Connecting the inside / outside air switching detection unit for detecting the setting of the inside / outside air introduction mode of the air conditioner to the control unit, and determining that the control unit is set to the inside air introduction mode by the output of the inside / outside air switching detection unit. Evaporator that holds the value of the evaporator introduction air temperature immediately before switching to the inside air introduction mode An air conditioning control device for a vehicle, characterized by having a function of maintaining the temperature of the wind introduced by the radiator.